秋季开学典礼班主任发言稿

1、秋季开学典礼班主任发言稿 there? After ignition, combustion should focus its attention on what? Reducing boiler hot loss measures? DC-what are the main characteristics of the boiler? Boiler steam after Bao Biwen how? when shutdown to control steam drum wall temperature difference? From a run standpoint, what are

2、 the main measures to reduce coal consumption for power supply? Talk about how to control the water level? Generator after splitting, 6KV why to promptly exit the standby power switch? Why the current transformer secondary side in the operation are not allowed to open? Why synchronous generator exci

3、tation circuit of the degaussing switch can be changed into a lively breaker? Generator step-up process, why the rotor and stator currents to monitor? Why are rotor one point ground prone to 2nd after ground? Try 380V discussed following the grounding of auxiliary power system, wiring for three-phas

4、e five-limb terminal of PT secondary voltage change? Generator incomplete phase operation principle is what? Yn,d11 (Y0/-11) connection of generator-transformer systems, generator open-phase running any help? Why to install 100% stator grounding protection for large generator? Why does not allow run

5、ning secondary short circuit? Generator excitation, excited, what is the of the overexcitation limit? Generator loss of excitation in the running, what is the impact on the system and the generator itself? Anti-cuozhong on the prevention of excitation system of generator caused by fault what damage?

6、 try discussing what are the measures of improving power system dynamic stability? What is a switching operation of the electrical equipment? main content switching operation of power plants and power systems are there? Try discussing malignant electric misoperation, which misuse personal, most of t

7、he equipment? Switch service power fast cutting device in several ways? in the alternate to the State, the standby power switch refused to deal with? Try discussing switching operations should focus on preventing misoperation accident? New operation or after majorrepair of transformers why test? Try

8、 discussing steps measured with a Megger insulationresistance of electrical equipment? Lu method is used to find DC grounding considerationarewhat? when there are two point grounding with the polarity should be . 1.600MW supercritical supplementary questions, blank mini disk can be divided into manu

9、al and two oil turbine; oil turbine disc wheel car, the turning speed of the rotor can be controlled at around 80120 RPM (high speed), and it is fulfilled by controlling access to the oil-pressure turbine oil turning on/off and speed level. Medium-speed Coal mill explosion-proof steam from a wind ro

10、om, _, _ separator casing into the ground to prevent the mill explosion in the process of starting and stopping. Mill load is to accept current signal to the coal control proportional pressure relief valve size, change of hydraulic accumulators and hydraulic cylinders, to achieve load changes. Seale

11、d Air for coal pulverizer drive, Rod bearings, roller. Cold wind of a user with a sealed air blower air, sealed air, ground coal to a cold wind. Turbine sealing oil primary oil source is air-side seal oil pump, the first alternate oil sources (mainly alternative oil source) is the main oil pump of t

12、urbine. When the primary oil source failure, the first spare source automatic put into operation. Second alternate oil sources primary alternate supply AC electric sealing oil pump on the fuel tank, when the turbine speed is less than 2/3 rated speed or first alternate source failure occurs, the sec

13、ond spare source automatic switch. Third alternative oil source is provided by DC sealing oil pump. Main fuel tank exhaust throttle should be located 2 steel closing door operation handwheel locking is not allowed and obvious warning signs should be hung. Steam engine room caught fire, when it threa

14、tened to tank or fuel system, shall immediately destroy the vacuum emergency stop, and turn on the tank accident put the throttle, speed and control on oil should be appropriate, to ensure that the rotors lubricants are not interrupted before static. Shaft seal overflow overflow to #8 the low pressu

15、re under normal conditions, when #8 the low pressure overflow when the outage to the condenser. Sliding pressure operation of deaerator may avoid deaerator steam source for throttling losses. Normal operation of steam turbine steam distribution mode for steam distribution nozzle. After the turbines

16、stopped, if the rotor cannot rotate for a short time, rotor _ _ under bending, highest in _ _ highs at this point rotor should be reset, close the hydrophobic _ _ cylinder, keeping _ up and down temperature difference between cylinder _ monitor rotor _ _ deflection, when after you verify that the ro

17、tor is, and then manually turning 180 o. When turning the motor over current or rotor disc doesnt move, do not forcibly barring _ _, but can not turn _ forced _ or turning the crane broke. Stop turning _8_ hours later, to stop the lube oil system. Condensate pumps due to transportation of saturated

18、water, the pump is most prone to cavitation _ _, therefore is composed of _ inducer _, and at the time of installation ensure the pump inlet has some highly _ _ intrusion, and design _ export recycled _ tubes, also in order to solve this problem. When the condenser when the water level is too low _

19、setting up _ pumps are turned on, into the air to prevent the pump design _ _ seal water, prevent the pump output is not normal. . Threaded tube within a water wall, deterioration of heat transfer does not occur. X turbine cold starts, heat transfer of steam to the cylinder wall is based on condensa

20、tion heat transfer and convective heat transfer in two ways at the same time. (X) the furnace higher excess air coefficient, smaller chemical heat loss due to incomplete combustion. () Boiler of soda expansion is inevitable. Start-up incorporations, boiler-DC operation, adjustment of main steam temp

21、erature control in a coal-water ratio between points. A single swirl burner burning adjacent burners are not required to support. Swirl burners with different rotation direction will affect the boiler steam temperature and load parameters. X boiler steam flow is divided with double built-in startup

22、separator designed for community process. During combustion of pulverized coal in boiler, oxygen content, the lower the NOx is produced more. When the gas-water ratio imbalances, once-through boiler steam temperature at each point in the trip will change, and closer to the pop tour entrance, inertia

23、 and hysteresis temperature change is smaller. In disguise near the heat transfer coefficient of steam increases to a maximum at first and then quickly lower. Control of start-up separator outlet steam temperature, that controls the boiler heating and evaporation, thermal heat distribution. (X) as t

24、he direct current requirements for operation of the boiler feedwater quality was much higher than that of drum boiler, in once-through boiler start-up process, therefore there is no need for furnace washing of Silicon. () UP the boiler is subcritical and supercritical parameters can be used in the f

25、urnace, working one or two times, connecting multiple hybrid, has a higher mass flow, suitable for large supercritical pressure once-through boiler. (X) this-is the biggest characteristic of evaporating heating surface of boiler tubes were repeatedly increased the vertical tube screen, using mixed h

26、eader and not in the middle of heated drop tube in series to each other. Due to the temperature difference between different Panel next to the pipe, thermal stress, membrane water wall of seam damage. Check () the spiral water wall in addition to import and export is located outside the box, no mixi

27、ng header in between, due to its arrangement of furnace size does not affect, even heat heat low errors will not result in the uneven distribution of steam-water mixture. (X) supercritical and subcritical case, when the water is heated to the appropriate phase transition temperature under pressure,

28、all vaporize into steam. (X) direct current boiler, water into steam steam-water two-phase region does not exist. The experienced heating and hot water into superheated steam in two stages. () Phase transition under supercritical pressure, when all water vaporized into steam temperature, also known

29、as the critical temperature. Different pressure phase transition temperature. (X) in the area near the phase transition point, the specific volume of refrigerant to rise sharply, and the greatest specific heat at constant pressure. () Under supercritical pressures, the specific heat of water increas

30、es with temperature, the specific heat of steam decreases with increasing temperature. () Under in subcritical once-through boiler evaporating heating surface of multiple values that appear unsteady flow, the main reason is a low enthalpy of evaporating heating surface inlet water. So in thelow-load

31、 operation must restrict entry low enthalpy of water. (X) the flowofrefrigeraevaporating heating surface of ambiguity existonlyinspiralwallverticatubecoilsdnotexist. Evaporation .education and training. (3) technology can guide operators work on the business, ready to solve engineering problems. (4)

32、 the text clearly technical problems with the cards on the table and retain the original information to the persons concerned, good technical approval and visa in a timely manner. 4, data administrator responsibilities (1) is responsible for all the project files, data collection, production, bindin

33、g, collating, storage (hand) and so on. (2) assist construction project fuck and other technical and engineering quality, safety, and education. (3) to help the staff disclosure of production technology, security technology, and collecting keep written information in a timely manner. (4) with the pe

34、rsonnel concerned to carry out the measurement of quality and safety checks, and technical information. (5) according to the data, to the conservation section chiefs will report on the situation. Four job agencies, conservation management to achieve good conservation, achieve a standard, we must est

35、ablish a sound management system, to ensure smooth progress. Under the unified leadership and management at different levels, to ensure that the concentration of decision-making power and unity of command, and a chain of authority, management at different levels; Division of labor and cooperation, s

36、o that the working groups towards the direction of professional development to ensure corporate goals and conservationComponent objectives of coordination, collaboration on the various functions of the body in action, coordination between the functional departments and managers, the entire managemen

37、t organizations to ensure that capable, efficient, multi-functional. Under the Chongqing Municipal landscaping management standards and the technical specifications of urban landscaping projects adopt the following approach working mechanism. Will this unit dedicated to the conservation section is d

38、ivided into four groups: the trees and shrubs to the conservation group (responsible for measures such as the shading); full-time mechanical maintenance group (responsible for watering, cooling, spray during the day), lawn maintenance groups and plant groups. Section with garden plant professional e

39、ngineer 1, each equipped with the professional technician 1, 2 technicians, carry out their duties. By the Resident Engineer of the conservation section chiefs and marketing grasp work and coordination. After five, lawn maintenance and management of plant construction, often with a 1-2 lawn maintena

40、nce can grow into the fullness of the week. After the lawn grow, but also to carry out regular maintenance and management, to ensure the lawn landscape continues for a long time. Lawn maintenance management including: irrigation, fertilization, pruning, weeding and other links. 1, irrigate irrigatio

41、n lawn fertility environments can be improved, adding water plant the lawn, is a guarantee of normal lawn. In view of the lawn during the growth season, lawn and the environment is in a State of flux, coordination of water and soil and improving the microclimate of the Center, water cannot be implem

42、ented according to a fixed pattern, following a number of technical points for reference. (1) the irrigation time growing season, according to the different periods of precipitation is extremely important and timely irrigation of different grass species. Can generally be divided into three periods:

43、turned green before the rainy season. High temperatures during this period, transpiration, water requirements, and is one of the most crucial irrigation under soil water retention properties of strength and rainy periods during which Bush 2-4. largely ceased during the rainy season irrigation. Air h

44、umidity during this period, grass transpiration decreased soil moisture content has increased to a level sufficient to meet the needs of lawn growth. to yellowing of the leaf after this period before the rainy season precipitation, evaporation is greater, while the lawn is still in a great stage of

45、life activities, compared with the previous two periods, lawn water requirements increase at this stage, if not timely irrigation, not only affect the growth of grass, also causes yellow. At this stage, according to 4-5 of irrigation. In short, grass types, water requirements are different, you must

46、According to the climate conditions and plant species to determine irrigation of the lawn. About a day, when irrigation is better depends on irrigation. In theory, the same period as long as the amount of irrigation water is less than the infiltration capacity of the soil, irrigation all the time in

47、 a day. Then depends on the irrigation way. If intermittent intermittent spray or spray irrigation (high degree of atomization), irrigation is best with the Sun. Not only can add moisture, but also significantly improve the microclimate and photosynthesis and transpiration and gas exchange, facilita

48、ted the coordination of water, air, fertilizer and soil thermal and vegetative organs of root and root expansion, and could lead the entire transit storage of the plant material, breathing, lawns and lush. If using water, irrigation, and so on, should be watching season, early spring, late autumn ar

49、ound the heel as well and the rest take twilight as much. (2) irrigation irrigation quantity should be based on the soil, growing, grass and other factors to determine. General lawn growing season drought period, takes about a week to pay 20-40mm; vigorously growing lawn in the heat and severe droug

50、ht situations, need to pay 50-60mm per week or more. In General, regardless of the method, should be irrigated more than once, each time less water, maximum surface runoff that just occurred. 2, fertilizing to maintain lawn dark green leaves, grows, portions must be fertilized. Lawn plants for leaf

51、growth and blossom-free requirements, so nitrogen is more important, response to nitrogen fertilizer is the most obvious. Should be basic application in building lawn, lawn built in growing season required after applying fertilizer. Cold season grass dressing time is best in early spring and fall. A

52、fter the first green, can play a role in facilitating the growth of second in spring, after the weather turned hot, you should stop dressing. Fertilization in autumn on 9, October. Applies fertilizer the time is late spring of warm-season grasses. In a month or 2 months of growing season to be caugh

53、t up with fertilizer. Increasing the density of foliage, improve resistance to stepping on. Fertilizing should not be late for the last time in mid-September. 3, trim Pruning is the focus of lawn maintenance, but is the most intensive work. Trim control lawn height of the tillers, increasing the den

54、sity of leaves, weeds and lawn neat and beauty. General lawn trimmed at least 4-5 times a year, prune and trim the number of height is related to two factors. Lower the cutting height requirements, pruning more times. Leaves of grass density and coverage also increases with the number of trim and mo

55、re. It should be noted that in accordance with regular mowing the grass cutting height, when up to 1.5 times the height of the grass, trim twice times the maximum shall not exceed the specified height. 4, weed weed invasion will seriously affect the quality of the lawn, turf lost uniform and neat ap

56、pearance and purpose weed and grass competition for water, fertilizer, race the Sun, so that objective grass growth decline, so weed is an essential part of lawn maintenance and management. The fundamental methods of weed prevention and removal is the rational management of water and fertilizer, gra

57、ss growth promotion purposes, increase competitiveness with weeds, and multiple trim, suppress weeds. Case against weeds, in addition to using artificial rejects, I also use chemical herbicides, such as killing dicotyledonous weeds with 2.4-d class; using ximajin, prometryn, Diuron, closed soil inhi

58、bited germination of weed germination or kill weeds; sterilant herbicide, Diuron, and other lawn or lawn weed control of updates. Herbicide use is complicated, effect change over a number of factors, improper use can cause great losses and therefore should be carefully tested before use and preparat

59、ion, concentration, tools used should be responsible. 5, the pierced holes on the lawn of ventilation holes, aims to improve the ventilation of roots, soil moisture content, to improve the effect of fertilization. The work to improve the quality of turf plays an important role. General requirements for 50 points/m2, 15cmx5cm hole spacing and hole diameter 1.5-3.5cm, cave deep 8cm hollow Iron Rod man-tie hole available, we can use lawn punching machine (restore root aeration machine) purposes. Roo