CN104612763A - Device for starting intermediate-pressure cylinder device by using neighbor turbine steam in unitized unit and starting method thereof - Google Patents

Abstract

The invention discloses a unit system unit using adjacent steam to start a medium-pressure cylinder device and a starting method thereof. Leading to the medium pressure cylinder of the steam turbine, the steam source is provided by the auxiliary steam header of the adjacent machine connected to the auxiliary steam header of the local machine through the pipeline. The invention connects the steam source of the adjacent machine to the medium-pressure cylinder through the pipeline, and starts the medium-pressure cylinder of the machine. The boiler, the start-up fan and the electric feed water pump of the machine do not need to work, which can save power and fuel in the plant and improve the quality of the steam turbine after maintenance. Check and drive the rotor to work on-site, and can run ahead of time, check the installation quality and conduct no-load test of the electrical part before the unit is connected to the grid, reducing the operation and maintenance workload during this period, and also reducing the maintenance period of boilers and steam turbines Uncoordinated, so as to achieve energy saving, consumption reduction, high unit economy and reliability, high utilization rate, simple and convenient start-up method, safe and reliable operation.

Description

A kind of unit system unit uses adjacent steam to start the medium-pressure cylinder device and its starting method

technical field

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

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 large-scale thermal power plant unit units, adjacent units cannot be switched to each other. When the main equipment in a unit fails to operate, the entire unit can only be shut down. The poor operation flexibility results in the short maintenance period of 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 unit system unit that uses adjacent steam to start the medium-pressure cylinder device and its starting method, 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. 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 carry out 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, which is connected to the reheating and cold section pipe of the adjacent machine. The auxiliary steam header of the adjacent machine passes through The pipeline is connected with the auxiliary steam header of the machine.

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 is connected to the boiler reheater, and the boiler reheater is connected to the intermediate pressure cylinder of the steam turbine. On the reheating and cold section pipes, the auxiliary steam header of the adjacent machine is connected with the auxiliary steam header of the local machine through pipes;

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 machine unit, use the adjacent machine circulating pump to supply circulating water to the main engine, open the open water pump bypass door to the main engine unit hydrogen cooler, closed Water cooler and stator cooling water cooler inject water and exhaust air;

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

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

(4) Water injection of 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; (c) close Small machine exhaust steam disc valve and small machine exhaust steam desuperheating water valve;

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

(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, gradually turn off the main engine and lower side until the end of the speed increase, use the cooling of the adjacent engine and then go to the electric door of the auxiliary steam header to control the reheat steam pressure of the main engine at 0.8~0.9MPa; (d) After the speed of the main unit rises to 1500r/min, warm up the machine for 60 minutes, measure the vibration of each bearing, and 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; (f) The speed of the main unit rises to 3000r/min, Measure the vibration of each bearing.

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

Preferably, the vacuum of the condenser in the above step (8) reaches 0.03-0.05 MPa.

Preferably, in the above step (10), during the flushing, 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 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 ways

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 the 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, which is connected to the reheating and cold section pipe 8 of the adjacent machine, and the adjacent machine The auxiliary steam header 1 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 header of the adjacent machine through the pipeline, and the auxiliary steam The header, 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, and the gas source of the adjacent machine is delivered to the machine to start the medium-pressure cylinder, and finally from the The condenser 7 connected to the medium-pressure cylinder is discharged 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 feed pump, which can save power and fuel for the plant. After the completion of the quality inspection of the steam turbine, Drive the rotor to rotate for on-site work (such as dynamic balance, etc.), and can run in advance, check the installation quality and conduct no-load test of the electrical part before the unit is connected to the grid. At the same time, it can also reduce the operation and maintenance workload during this period. In addition, it can also alleviate the contradiction of uncoordinated boiler and steam turbine maintenance period, and has the advantages of energy saving, consumption reduction, high unit economy and reliability, and high energy utilization rate. The cost of pipeline connection is 30,000 per unit, compared with It costs 2.73 million per unit to start directly with this machine, which has 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.

A unit system unit utilizes adjacent steam to start an intermediate-pressure cylinder device, which includes a pipeline system transformation step and a start-up step.

Embodiment 1: A unit system unit uses adjacent steam to start the medium-pressure cylinder device, and 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 a medium-pressure cylinder device using adjacent steam for a unit system unit. A unit system unit is used to start the medium-pressure cylinder device with adjacent steam. The steps include the following:

(1) Inject water into the circulating water system of unit 1, 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 The hydrogen cooler, closed water cooler, and stator cooling water cooler of Unit 1 are filled with water and exhausted, and can be used for the 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) Condensate water system injects water and exhausts 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; (c) close the exhaust steam disc valve of the small machine and the exhaust steam desuperheating water valve of the small machine;

(6) Start a condensate pump to recirculate and supply water to the condensate jellyfish pipe at the same time;

(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 during flushing: the pressure in front of the intermediary pressure combined steam valve is 0.6~0.8 MPa, temperature 240~260°C, 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 header electric The 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/min after the unit of No. 1 unit hangs the gate , the rate of increase is 100r/min/min, and the reheating is carried out. After the No. 1 unit is reversing, pay attention to the cranking tripping situation, and use the low side adjustment to control the reheating steam pressure; (e) Depending on the reheating steam pressure of No. 1 unit tends to Stable, after the steam drum water level 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, and gradually turn down the low side of No. After the machine is cooled, go to the electric door of the auxiliary steam header to control the reheat steam pressure of No. 1 unit at 0.8~0.9MPa; (f) After the unit speed of No. 1 unit rises to 1500r/min, warm up the machine for 60 minutes, measure the vibration of each bearing, and inspect the unit After the expansion difference, cylinder expansion, and cylinder wall temperature difference reach the specified range of equipment operation, continue to increase the speed; (g) The speed of 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 (9)

1. a unit style unit utilizes adjacent vapour to start intermediate pressure cylinder device, comprise the machine and adjacent machine, described the machine is provided with the auxiliary vapour header (4) of the machine, the auxiliary vapour header (4) of described the machine connects boiler reheater (5), described boiler reheater (5) connects Steam Turbine Through IP Admission (6), described adjacent machine is provided with the auxiliary vapour header (1) of adjacent machine, be connected in cold section of adjacent machine reheating pipe (8), it is characterized in that: adjacent machine auxiliary vapour header (1) is connected by the auxiliary vapour header (4) of pipeline (2) and the machine.

2. a kind of unit style unit according to claim 1 utilizes adjacent vapour to start intermediate pressure cylinder device, it is characterized in that: described pipeline (2) is arranged valve (3).

3. a kind of unit style unit according to claim 2 utilizes adjacent vapour to start intermediate pressure cylinder device, it is characterized in that: described valve (3) adopts motor regulated valve.

4. intermediate pressure cylinder start-up device is carried out in the adjacent machine vapour source of a kind of unit style unit according to claim 1, it is characterized in that: described pipeline (2) employing external diameter is 377mm, wall thickness is the pressure piping of 16mm.

5. a unit style unit utilizes adjacent vapour to start the starting method of intermediate pressure cylinder device, it is characterized in that: comprise a kind of unit style unit and utilize adjacent vapour to start intermediate pressure cylinder device, this device comprises the machine and adjacent machine, described the machine is provided with the auxiliary vapour header (4) of the machine, the auxiliary vapour header (4) of described the machine connects boiler reheater (5), described boiler reheater (5) connects Steam Turbine Through IP Admission (6), described adjacent machine is provided with the auxiliary vapour header (1) of adjacent machine, be connected in cold section of adjacent machine reheating pipe (8), adjacent machine auxiliary vapour header (1) is connected by the auxiliary vapour header (4) of pipeline (2) and the machine,

Described pipeline (2) is arranged valve (3);

Described valve (3) adopts motor regulated valve;

Described pipeline (2) employing external diameter is 377mm, wall thickness is the pressure piping of 16mm;

The starting method step that a kind of unit style unit utilizes adjacent vapour to start intermediate pressure cylinder device comprises as follows:

(1) main frame circulation carries out water filling, main frame and adjacent machine unit are followed pump discharge communicating door to open, utilize adjacent machine to follow pump to main frame for circulating water, unlatching open type water pump bypass door is to the hydrogen-cooled device of main frame unit, closed water cooler, stator cooling water cooler water filling air-discharging;

(2) main frame generator unit cooling water system water filling, starts cooling waterpump and runs;

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

(4) condensate system water filling;

(5) isolated system forms intermediate pressure cylinder start-up passage: (a) Shutdown Hosts is crossed, reheater cooling water hand operated door, closes high other cooling water power door operation; B () closes main high other, the stifled valve of superheater test, high row's non-return flap; C the auxiliary vapour header of () Shutdown Hosts heats hand operated door to oxygen-eliminating device, Shutdown Hosts auxiliary vapour header is to the total door of little machine vapour, the total door of heating vapour at the bottom of Shutdown Hosts auxiliary vapour header to Boiler Furnace, Shutdown Hosts auxiliary vapour header is to the total door of coal pulverizer steam for fire xtinguishing, Shutdown Hosts auxiliary vapour header, to the total door of HVAC vapour, closes starting trouble to main frame auxiliary vapour header admission hand operated door; C () 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 solidifying assorted jellyfish pipe simultaneously;

(7) start vacuum pump to vacuumize vapour condenser;

(8) vapour condenser utilizes adjacent machine auxiliary vapour vapour source to carry out heating coil to the auxiliary vapour header of main frame, shaft seal vapour system, main frame cold segment pipe after reaching vacuum 0.03 ~ 0.05MPa;

(9) drop into main frame shaft seal vapour, little arbor envelope vapour does not come into operation;

(10) main frame unit red switch: (a) opens adjacent machine vapour source, vapour source is by cold section of adjacent machine reheating-adjacent machine auxiliary vapour header-main frame auxiliary vapour header-main frame reheating cold section-main frame stove reheater-main frame intermediate pressure cylinder, and the red switch realizing main frame intermediate pressure cylinder starts; B after () unit extension lock, target setting rotating speed is 200r/min, raising speed rate 100r/min/min, carries out red switch, notes jiggering dropout situation after unit red switch, utilizes low other regulable control reheat steam pressure; C () is tended towards stability depending on main frame reheat steam pressure, after adjacent machine steam water-level is stable, target setting rotating speed is 1500r/min, raising speed rate 100r/min/min, continue raising speed, turn down the low side of main frame in boosting velocity procedure gradually until closed, utilize adjacent machine cold again to auxiliary vapour header power door operation main control system reheat pressure at 0.8 ~ 0.9MPa; D () main frame generating unit speed to rise to after 1500r/min warming-up 60 minutes, measure each bear vibration, difference that unit is swollen, after cylinder is swollen, the casing wall temperature difference reaches equipment operating predetermined range, continues raising speed; F () main frame generating unit speed rises to 3000r/min, measure each bear vibration.

6. a kind of unit style unit according to claim 5 utilizes adjacent vapour to start the starting method of intermediate pressure cylinder device, it is characterized in that: in above-mentioned steps (1), main frame and adjacent machine unit are followed pump discharge communicating door and open to 50%.

7. a kind of unit style unit according to claim 5 utilizes adjacent vapour to start the starting method of intermediate pressure cylinder device, it is characterized in that: in above-mentioned steps (8), condenser vacuum reaches 0.03 ~ 0.05MPa.

8. a kind of unit style unit according to claim 5 utilizes adjacent vapour to start the starting method of intermediate pressure cylinder device, it is characterized in that: pressure 0.6 ~ 0.8MPa, temperature 240 ~ 260 DEG C before reheat stop interceptor valve during red switch in above-mentioned steps (10), the load >=450MW of adjacent machine unit.

9. a kind of unit style unit according to claim 8 utilizes adjacent vapour to start intermediate pressure cylinder device, it is characterized in that: in above-mentioned steps (10), before the red switch of main frame unit, the low side of main frame is left to 10%, before utilizing cold section of adjacent machine reheating to auxiliary vapour header power door operation to regulate main frame reheat stop interceptor valve, pressure is at 0.8 ~ 0.9MPa.