CN104612763B - A method for starting an intermediate-pressure cylinder device using adjacent steam for a unit system unit - Google Patents

Abstract

The invention discloses a starting method of a device for starting an intermediate-pressure cylinder device by using neighbor turbine steam in a unitized unit. The device comprises a native turbine and a neighbor turbine, a steam source is injected to a turbine intermediate-pressure cylinder through a native turbine auxiliary steam header on the native turbine and a boiler reheater connected with the native turbine auxiliary steam header, and the steam source is provided by a neighbor turbine auxiliary steam header communicated with the native turbine auxiliary steam header through a pipeline. The neighbor turbine steam source is connected to the intermediate-pressure cylinder through a pipeline to start the native turbine intermediate-pressure cylinder, a native turbine boiler, a starting fan and an electric feed pump do not need to work, house supply and fuel can be saved, the on-site work of inspecting the quality after an overhaul of the turbines and driving a rotor to rotate is completed, impulse starting, installation quality inspection and no-load tests on an electric part before grid connection of the unit can be carried out ahead of time, running operation and the maintenance workload in the period are reduced, and disharmony between the overall duration of the boiler and the overall duration of the turbines can be relieved, so that energy conservation and consumption reduction are achieved, the unit is high in economy, reliability and utilization ratio, the starting method is easy and convenient, and operation is safe and reliable.

Description

A method for starting an intermediate-pressure cylinder device using adjacent steam for a unit system unit

technical field

The invention belongs to the technical field of steam turbines, and relates to a method for starting an intermediate-pressure cylinder device of a unit system unit using adjacent steam.

Background technique

For a long time, during the maintenance of large-scale unit units, it has often occurred that the maintenance schedules of boilers and steam turbines cannot be well coordinated. It is often because the steam turbines are overhauled and the results of the maintenance are urgently needed to be inspected or the on-site work (such as dynamic balance, etc.) is required to drive the rotor to rotate. ) and the boiler fails to ignite for some reason. However, when the boiler was overhauled and then ignited and the steam turbine was started, it was found that the overhaul effect of the steam turbine was not good and required rework, which delayed the construction period. The overhaul period of the unit is extended, and the reliability, utilization rate and economy of the equipment are reduced. In the design of unitary units in large thermal power plants, adjacent units cannot be switched to each other. When the main equipment in a unit fails and cannot operate, the entire unit can only be shut down. The poor operating flexibility results in a short period of maintenance for steam turbine boilers. The main reason for the good coordination.

Judging from the implementation of the unit, from the ignition of the boiler to the end of the electrical test, it takes about 60 hours, consumes about 300 tons of fuel oil, and costs 2.4 million yuan per unit; at the same time, the boiler starts the fan, the steam turbine starts the electric water pump, and the unit starts The power consumption of the factory: (6300+3000+1700)*60=660000kw.h/unit, the consumption cost is 330,000 yuan/unit, and the total consumption cost is 2.73 million yuan/unit, which is expensive.

Contents of the invention

The technical problem to be solved by the present invention is to provide a starting method for a unit unit unit using adjacent steam to start the medium-pressure cylinder device, which can realize that the boiler fan does not start and does not ignite, and the steam turbine does not need to start the electric feed water pump to realize the steam turbine. Start the medium-pressure cylinder, complete the quality inspection after the overhaul of the steam turbine, drive the rotor to rotate on-site (such as dynamic balance, etc.), and conduct the no-load test of the electrical part before the unit is connected to the grid, so as to overcome the problems existing in the existing technology.

The technical solution adopted by the present invention is: a unit unit unit utilizes the adjacent steam to start the medium-pressure cylinder device, including the local machine and the adjacent machine, the local machine is provided with the local auxiliary steam header, the local auxiliary steam The boiler reheater is connected to the boiler reheater, and the boiler reheater is connected to the intermediate pressure cylinder of the steam turbine. The auxiliary steam header of the adjacent machine is installed on the adjacent machine, and the auxiliary steam header of the adjacent machine is connected to the reheating and cold section pipe of the adjacent machine. , the auxiliary steam header of the adjacent machine is connected with the auxiliary steam header of the local machine through pipelines.

A valve is arranged on the pipeline, which can connect and cut off the gas source, and can adjust the pressure of the steam flowing through, and play the role of safety protection.

The valve adopts an electric regulating valve, which is convenient for automatic control, reduces labor intensity and is precise in control.

The pipeline adopts a pressure pipeline with an outer diameter of 377mm and a wall thickness of 16mm, which can meet the punching pressure requirements of the medium-pressure cylinder of the machine, and is convenient for welding and installation.

A method for starting an intermediate-pressure cylinder device of a unit system unit using adjacent steam, including a device for starting the medium-pressure cylinder with the steam source of the adjacent unit of the unit system unit. The device includes a local machine and an adjacent machine. The auxiliary steam header of the local machine, the auxiliary steam header of the local machine is connected to the boiler reheater, the boiler reheater is connected to the intermediate pressure cylinder of the steam turbine, the auxiliary steam header of the adjacent machine is set on the adjacent machine, and the adjacent machine The auxiliary steam header is connected to the reheating and cooling pipe of the adjacent machine, and the auxiliary steam header of the adjacent machine is connected with the auxiliary steam header of the local machine through the pipeline;

A valve is set on the pipeline;

The valve adopts electric regulating valve;

The pipeline adopts a pressure pipeline with an outer diameter of 377mm and a wall thickness of 16mm;

A method for starting a medium-pressure cylinder device using adjacent steam for a unit system unit, the steps of which include the following steps:

(1) Inject water into the circulating water system of the main engine, open the connecting door of the circulating pump outlet of the main engine and the adjacent unit, use the circulating pump of the adjacent unit to supply circulating water to the main engine, and open the open water pump bypass door to the hydrogen cooler of the main engine unit, Closed water cooler, stator cooling water cooler inject water and discharge air;

(2) Inject water into the stator cooling water system of the main engine unit, and start the cooling water pump;

(3) Make up water to the condenser to the water level of 800~1000mm;

(4) Inject water into the condensate system;

(5) The isolation system forms the starting channel of the medium pressure cylinder: (a) close the manual door of the superheater and reheater desuperheating water of the main engine, and close the electric door of the desuperheating water of the high side; (b) close the main high side, superheater test blocking valve, high (c) Close the manual door from the main engine auxiliary steam header to the deaerator heating, close the main engine auxiliary steam header to the small machine steam main door, close the main engine auxiliary steam header to the boiler bottom heating and other steam Main door, close main engine auxiliary steam header to coal mill fire-fighting steam main door, close main engine auxiliary steam header to heating general steam main door, close start boiler to main engine auxiliary steam header steam inlet manual door; (d) close Small machine exhaust steam disc valve and small machine exhaust steam desuperheating water valve;

(6) Start the recirculation of the condensate pump, and at the same time supply water to the miscellaneous water pipe of the condensate;

(7) Start the vacuum pump to evacuate the condenser;

(8) After the condenser reaches a vacuum of 0.03~0.05MPa, use the auxiliary steam source of the adjacent machine to warm the auxiliary steam header of the main engine, the shaft seal steam system, and the cold section pipeline of the main engine;

(9) The shaft seal steam of the main machine is put into use, and the shaft seal steam of the small machine is not put into use;

(10) The main engine unit rushes forward: (a) Turn on the steam source of the adjacent machine, and the steam source passes through the reheating and cooling section of the adjacent machine—the auxiliary steam header of the adjacent machine—the auxiliary steam header of the main engine—the reheating and cold section of the main engine—the reheating of the main engine furnace (b) Set the target speed to 200r/min after the main engine unit hangs the brake, and set the target speed to 200r/min, and the rising rate to 100r/min/min, to perform the reverse rotation, and the main engine unit to reverse Finally, pay attention to the cranking and tripping situation, and use the low side adjustment to control the reheating steam pressure; (c) depending on the main engine reheating steam pressure tends to be stable, set the target speed to 1500r/min and the rising rate to 100r after the steam drum water level of the adjacent machine is stable /min/min, continue to increase the speed. During the speed-up process, gradually turn off the lower side of the main engine until it is completely closed. Use the reheating and cooling section of the adjacent machine to the electric door of the auxiliary steam header to control the reheating steam pressure of the main engine at 0.8~0.9MPa; ( d) Warm up the machine for 60 minutes after the speed of the main engine unit rises to 1500r/min, measure the vibration of each bearing, the expansion difference of the unit, the cylinder expansion, and the temperature difference of the cylinder wall reach the specified range, and continue to increase the speed; (e) The speed of the main engine unit rises to 3000r/min min, measure the vibration of each bearing.

Preferably, in the above step (1), the connecting door of the circulating pump outlet of the main engine and the adjacent machine unit is opened to 50%, which can meet the requirement of the intermediate pressure cylinder to run.

Preferably, in the above step (10), when the main engine unit is running, the pressure in front of the medium pressure combined steam valve is 0.6~0.8MPa, the temperature is 240~260°C, and the load of the adjacent engine unit is ≥450MW.

Preferably, in the above step (10), before the main engine unit runs, the low side of the main engine is opened to 10%, and the pressure in front of the main engine medium pressure combined steam valve is adjusted to 0.8~0.9MPa by using the adjacent machine reheating and cooling section to the auxiliary steam header electric door .

Beneficial effects of the present invention: Compared with the prior art, the present invention uses pipes to connect the auxiliary steam header of the local machine with the auxiliary steam header of the adjacent machine, and transports the steam source of the adjacent machine to the machine to start the medium-pressure cylinder. The steam turbine does not need to start the fan and ignition, and the steam turbine does not need to start the electric feed pump, which can save power and fuel consumption, complete the quality inspection after the steam turbine is overhauled, and drive the rotor to perform on-site work (such as dynamic balance, etc.), and can be rushed in advance , inspect the installation quality and carry out the no-load test of the electrical part before the unit is connected to the grid. Consumption reduction, high unit economy and reliability, and high energy utilization rate. The cost of pipeline connection is 30,000 per unit, compared with the cost of 2.73 million per unit for direct startup of the machine, which has high economic utility. , The starting method is simple and convenient, and the operation is safe and reliable.

Description of drawings

Fig. 1 is a structural schematic diagram of the present invention.

In the figure, 1-adjacent machine auxiliary steam header, 2-pipeline, 3-valve, 4-local machine auxiliary steam header, 5-boiler reheater, 6-local machine medium pressure cylinder, 7-condenser, 8-neighboring machine reheating cold section pipe, 9-local machine reheating cold section pipe.

detailed description

As shown in Figure 1, a unitary unit uses the adjacent steam to start the medium-pressure cylinder device, including the local machine and the adjacent machine. The local machine is provided with a local auxiliary steam header 4, and the local auxiliary steam header 4 is connected to the boiler reheater 5, the boiler reheater 5 is connected to the medium pressure cylinder 6 of the steam turbine, and the auxiliary steam header 1 of the adjacent machine is arranged on the adjacent machine, and the auxiliary steam header 1 of the adjacent machine is connected to the adjacent machine On the hot and cold section pipe 8, the auxiliary steam header 1 of the adjacent machine is connected with the auxiliary steam header 4 of the local machine through the pipe 2, and the auxiliary steam header of the local machine is connected with the auxiliary steam The reheating and cooling section, the auxiliary steam header of the adjacent machine, the auxiliary steam header of the main engine, the reheating and cold section of the main engine, the reheater of the main engine furnace and the medium pressure cylinder of the main engine form a closed steam source channel, which transports the air source of the adjacent machine to the pair of the machine. The medium-pressure cylinder is started, and finally discharged from the condenser 7 connected to the medium-pressure cylinder, so as to realize the punching of the stamping cylinder. The boiler of this machine does not need to start the fan and ignition, and the steam turbine does not need to start the electric water pump, which can save electricity and fuel for the plant. , to complete the quality inspection after the overhaul of the steam turbine, to drive the rotor to rotate on-site (such as dynamic balance, etc.), and to run ahead of time, check the installation quality, and conduct the no-load test of the electrical part before the unit is connected to the grid. At the same time, it can also reduce this The workload of operation and maintenance during the period can also alleviate the contradiction of uncoordinated boiler and steam turbine maintenance period. At the same time, it has the advantages of energy saving, consumption reduction, high economy and reliability of the unit, and high energy utilization rate. The cost is 30,000 per unit, compared with 2.73 million per unit for direct start-up of this machine, it has a very high economic utility.

The pipeline 2 is provided with a valve 3, which can connect and cut off the gas source, and can adjust the pressure of the steam flowing through, and play a role of safety protection.

The valve 3 adopts an electric regulating valve, which is a hydraulically operated valve with a solenoid valve as the guide valve. The control response is accurate and fast, and the pipeline system is opened and closed remotely according to the electric signal to realize remote operation, and can replace gate valves and butterfly valves. For large electric operating systems. The closing speed of the valve is adjustable, and it closes smoothly without pressure fluctuations. The valve is small in size, light in weight, easy to maintain, easy to use, safe and reliable, easy to automatically control, reduces labor intensity, and has precise control.

The pipe 2 is a pressure pipe with an outer diameter of 377 mm and a wall thickness of 16 mm, which is the same size as the pipe outer diameter of the existing equipment, can meet the punching pressure requirements of the medium-pressure cylinder of the machine, and is convenient for welding and installation.

As shown in Figure 1, for the convenience of description, it is assumed that the adjacent machine that provides the steam source is No.

The medium-pressure cylinder start-up device for the adjacent machine steam source of the unit system unit of a large thermal power plant includes the steps of pipeline system transformation and start-up steps.

Embodiment 1: A device for starting the medium-pressure cylinder with the steam source of the adjacent unit of the unit system, the transformation steps are as follows:

(1) Remove the check gate spool from the reheating and cooling section of No. 1 unit to the auxiliary steam header of No. 1 unit;

(2) Remove the reheating and cooling section of No. 1 unit to the electric adjustment door of the auxiliary steam header of No. 1 unit, and use short pipes to short-circuit;

(3) Remove the reheating and cooling section of No. 2 unit to the electric adjustment door of the auxiliary steam header of No. 2 unit, and short-circuit it with a short pipe;

(4) Set the electric door switch of the reheating and cooling section of No. 2 unit to the auxiliary steam header of No. 2 unit as pulse electric for 5 seconds;

(5) All other original piping systems remain unchanged, the auxiliary steam header of No. 1 unit is connected with the auxiliary steam header of No. 2 unit by pipelines, and valves are set on the pipelines;

(6) The pipe diameter, wall thickness and material of the pipe selected in the above steps should be consistent with the original pipe, and the welding should be carried out according to the material requirements.

Embodiment 2: A method for starting the medium-pressure cylinder starting device with the steam source of the adjacent machine of the unit system unit, using a steam source of the adjacent machine of the unit system unit to start the medium-pressure cylinder starting device, the steps include the following:

(1) Inject water into the circulating water system of No. 1 unit, open the connecting door of the circulation pump outlet of Units 1 and 2 to 50%, use the circulation pump of Unit 2 to supply circulating water to Unit 1, and open the bypass door of the open water pump For the hydrogen cooler, closed water cooler, and stator cooling water cooler of Unit 1, inject water and discharge air, and perform pump interlock test of Unit 1 at the same time to restore standby;

(2) Inject water into the stator cooling water system of unit 1, and start a cooling water pump;

(3) Condenser water replenishment to normal water level 800~1000mm;

(4) Inject water into the condensate system to discharge air;

(5) The isolation system forms the starting channel of the medium-pressure cylinder: (a) Close the manual door of the desuperheating water of the No. 1 unit and the reheater, and close the electric door of the high-side desuperheating water; (b) Close the high-side and superheater test of the No. 1 unit Blocking valve, high row check door; (c) Close the auxiliary steam header of No. 1 unit to the deaerator heating manual door, close the auxiliary steam header of No. From the header to the boiler bottom heating steam main door, close the No. 1 auxiliary steam header to the coal mill fire-fighting steam main door, close the No. 1 auxiliary steam header to the heating general steam The steam inlet manual door of the auxiliary steam header of No. 1 unit; (d) close the exhaust steam disc valve of the small machine and the exhaust steam desuperheating water valve of the small machine;

(6) Start the recirculation of a condensate pump, and at the same time supply water to the condensate miscellaneous water pipe;

(7) Start the vacuum pump to evacuate the condenser, and observe that the cooling water of the vacuum pump should be put into operation normally;

(8) After the vacuum of the condenser reaches 0.03~0.05MPa, use the auxiliary steam source of No. 2 unit to warm up the auxiliary steam header of No. 1 unit, the shaft seal steam system, and the cold section pipeline of No. 1 unit;

(9) After the shaft seal steam heating pipe is completed, the shaft seal steam of No. 1 unit is put into the shaft seal steam, and the shaft seal steam of the small machine is not input;

(10) The main engine unit reverses: (a) The start-up steam source of No. 1 unit is provided by the auxiliary steam source of No. 2 unit. The specific flow direction of the steam source flowing through the equipment is as follows: No. 2 unit reheating and cooling section - No. 2 unit auxiliary steam header - Auxiliary steam header of No. 1 unit—reheating and cooling section of No. 1 unit—reheater of No. 1 furnace—intermediate pressure cylinder of No. 1 unit; (b) Steam parameters when the main engine unit is running: the pressure in front of the medium pressure combined steam valve is 0.6 ~0.8MPa, temperature 240~260℃, load of No. 2 unit ≥450MW; (c) No. 1 unit low-side open to 10% before No. 1 unit reverses, use No. 2 unit to reheat and cool section to auxiliary steam unit The box electric door adjusts the pressure in front of the medium pressure combined steam valve of No. 1 unit at 0.8~0.9MPa, and the safety door of the auxiliary steam header of No. 1 and No. 2 units should not operate; (d) Set the target speed to 200r after the unit of No. 1 unit hangs the brake /min, the rate of increase is 100r/min/min, and the reheating steam is carried out. After the reheating of the No. 1 unit, pay attention to the cranking and tripping situation, and use the low side adjustment to control the reheating steam pressure; (e) depending on the reheating steam pressure of the No. 1 unit It tends to be stable. After the water level of the steam drum of No. 2 unit is stable, set the target speed to 1500r/min, and the increase rate is 100r/min/min. Continue to increase the speed. Control the reheat steam pressure of No. 1 unit at 0.8~0.9MPa from the reheating and cooling section of No. 2 unit to the auxiliary steam header; (f) Warm up for 60 minutes after the unit speed of No. 1 unit rises to 1500r/min, measure each bearing Vibration, depending on the expansion difference of the unit, the cylinder expansion, and the temperature difference of the cylinder wall reach the specified range of equipment operation, continue to increase the speed; (g) The speed of the No. 1 unit is increased to 3000r/min, and the vibration of each bearing is measured.

The above starting methods are simple, convenient, feasible, safe, reliable and accurate in testing.

Claims (4)

1. a kind of unit style unit using adjacent vapour start intermediate pressure cylinder device startup method it is characterised in that: include a kind of unit Unit neighbour's machine vapour source processed carries out intermediate pressure cylinder start-up device, and this device includes the machine and adjacent machine, described the machine is provided with the machine auxiliary Vapour header (4), described machine auxiliary steam header (4) connects boiler reheater (5), and described boiler reheater (5) connects in steam turbine Cylinder pressure (6), described neighbour's machine is provided with adjacent machine auxiliary steam header (1), and described neighbour's machine auxiliary steam header (1) is connected to cold section of adjacent machine reheating On pipe (8), adjacent machine auxiliary steam header (1) is connected with this machine auxiliary steam header (4) by pipeline (2), and described pipeline (2) is upper to arrange valve Door (3), described valve (3) adopts motor regulated valve, and it is 377mm that described pipeline (2) adopts external diameter, wall thickness is the pressure of 16mm Pipeline, the step of this startup method includes the following:

(1) water filling is carried out to main frame circulation, main frame and adjacent machine unit circulating-pump outlet communicating door are opened, using adjacent machine Unit circulating pump supplies recirculated water, unlatching open type water pump bypass door hydrogen-cooled device, closed water cooler, stator to main frame unit to main frame Cooling water cooler water filling air-out；

(2) main frame generator unit cooling water system is carried out with water filling, starts cooling water pump and run；

(3) condenser water replenishing is to water level 800 ~ 1000mm；

(4) water filling is carried out to condensate system；

(5) shielding system forms intermediate pressure cylinder start-up passage: (a) cut out main frame crosses, reheater desuperheating water manually operated door, closes high side and subtracts Warm water electrically operated gate；B () closes main high other, the stifled valve of superheater test, high row's non-return flap；C () closes main machine auxiliary steam header to deoxygenation Device heats manually operated door, closes main machine auxiliary steam header to the little machine total door of vapour, closes main machine auxiliary steam header and uses to the heating of Boiler Furnace bottom The total door of vapour, closes main machine auxiliary steam header to the total door of coal pulverizer steam for fire xtinguishing, closes main machine auxiliary steam header to the HVAC total door of vapour, closes Close starting trouble to main machine auxiliary steam header and enter vapour manually operated door；D () closes little machine steam discharge dish valve and little machine steam discharge desuperheat water valve；

(6) start the recirculation of condensate pump, supply water to the miscellaneous Jellyfish pipe of condensate simultaneously；

(7) start vacuum pump to condenser evacuation；

(8) condenser reach after vacuum 0.03 ~ 0.05mpa using adjacent machine auxiliary steam vapour source to main machine auxiliary steam header, axle envelope vapour system, Main frame cold segment pipe carries out heating coil；

(9) put into main frame axle envelope vapour, little arbor envelope vapour does not come into operation；

(10) main frame unit red switch: (a) opens adjacent machine vapour source, vapour source passes through adjacent cold section of adjacent machine auxiliary steam header main frame of machine reheating Auxiliary cold section of main frame stove reheater main frame intermediate pressure cylinder of vapour header main frame reheating, the red switch realizing main frame intermediate pressure cylinder starts；(b) After unit hangs lock, target setting rotating speed is 200r/min, rises speed 100r/min/min, carries out red switch, attention disk after unit red switch Car dropout situation, controls reheat steam pressure using low other regulation；C () is tended towards stability depending on main frame reheat steam pressure, adjacent machine drum water After position is stable, target setting rotating speed is 1500r/min, rises speed 100r/min/min, continues raising speed, gradually closes in boosting velocity procedure The low side of little main frame until having closed, using cold section of adjacent machine reheating extremely auxiliary vapour header electrically operated gate control main frame reheat pressure 0.8 ~ 0.9mpa；D () main frame generating unit speed rises to warming-up 60 minutes after 1500r/min, measure each bear vibration, difference that unit is swollen, cylinder is swollen, After the casing wall temperature difference reaches equipment operation prescribed limit, continue raising speed；E () main frame generating unit speed rises to 3000r/min, measure each axle Hold vibration.

2. a kind of unit style unit according to claim 1 starts the startup method of intermediate pressure cylinder device using adjacent vapour, and it is special Levy and be: in above-mentioned steps (1) open main frame and adjacent machine unit circulating-pump outlet communicating door to 50%.

3. a kind of unit style unit according to claim 1 starts the startup method of intermediate pressure cylinder device using adjacent vapour, and it is special Levy and be: pressure 0.6 ~ 0.8mpa, temperature 240 ~ 260 before reheat stop interceptor valve during main frame unit red switch in above-mentioned steps (10) DEG C, the load >=450mw of adjacent machine unit.

4. a kind of unit style unit according to claim 3 starts the startup method of intermediate pressure cylinder device using adjacent vapour, and it is special Levy and be: before main frame unit red switch in above-mentioned steps (10), the low side of main frame is left to 10%, using adjacent cold section of extremely auxiliary vapour connection of machine reheating Before case electrically operated gate regulation main frame reheat stop interceptor valve, pressure is in 0.8 ~ 0.9mpa.