阅读说明：本技术 一种母管制机组锅炉启停调节系统及方法 (Boiler start-stop adjusting system and method for main pipe unit ) 是由 冯斌 赵帅 王昭 徐远纲 王慧青 于 2021-07-12 设计创作，主要内容包括：一种母管制机组锅炉启停调节系统及方法,包括设置在高压缸出水系统中的1号锅炉高压缸、1号锅炉1号高压加热器、1号锅炉省煤器、2号锅炉高压缸、2号锅炉1号高压加热器和2号锅炉省煤器；所述1号锅炉高压缸的一级抽汽连接至1号锅炉1号高压加热器,高压加热器的出水分为两路,一路接入1号锅炉省煤器给水系统中,第二路通过出水管道接入2号锅炉省煤器给水系统中,2号锅炉高压缸的一级抽汽连接至2号锅炉1号高压加热器,高压加热器的出水接入2号锅炉省煤器中。本发明能够有效解决母管制机组第二台锅炉启停时的受热不均问题,降低煤耗,提高了火电机组参与调峰的灵活性。(A boiler start-stop adjusting system and method for a header unit comprise a No. 1 boiler high-pressure cylinder, a No. 1 boiler high-pressure heater, a No. 1 boiler economizer, a No. 2 boiler high-pressure cylinder, a No. 2 boiler No. 1 high-pressure heater and a No. 2 boiler economizer which are arranged in a high-pressure cylinder water outlet system; the one-level steam extraction of No. 1 boiler high pressure cylinder is connected to No. 1 boiler high pressure heater, and high pressure heater's play water is divided into two the tunnel, inserts in No. 1 boiler economizer water supply system all the way, and the second road inserts in No. 2 boiler economizer water supply system through outlet conduit, and the one-level steam extraction of No. 2 boiler high pressure cylinder is connected to No. 1 boiler high pressure heater of No. 2 boiler, and the play water of high pressure heater inserts in No. 2 boiler economizer. The method can effectively solve the problem of uneven heating when the second boiler of the main pipe unit is started and stopped, reduces the coal consumption, and improves the flexibility of the thermal power generating unit participating in peak shaving.)

1. A boiler start-stop adjusting system of a header unit is characterized by comprising a No. 1 boiler high-pressure cylinder (1), a No. 1 boiler high-pressure heater (2), a No. 1 boiler economizer (3), a No. 2 boiler high-pressure cylinder (4), a No. 2 boiler high-pressure heater (5) and a No. 2 boiler economizer (6) which are arranged in a high-pressure cylinder water outlet system;

the one-level steam extraction of 1 boiler high pressure cylinder (1) is connected to 1 boiler 1 high pressure heater (2), the play water of high pressure heater (2) is divided into two the tunnel, first access is in 1 boiler economizer (3) water supply system all the way, the second way is in 2 boiler economizer (6) water supply systems through outlet conduit access, the one-level steam extraction of 2 boiler high pressure cylinder (4) is connected to 2 boiler 1 high pressure heater (5), the play water of high pressure heater inserts in 2 boiler economizer (6), the feedwater of 2 boiler economizer (6) is become by the play water that comes from 1 boiler high pressure heater (2) and the play water of 2 boiler high pressure heater (5).

2. The boiler start-stop adjusting system of the main control unit according to claim 1, characterized in that a water outlet pipeline is arranged between the high-pressure heater (2) of the boiler No. 1 and the economizer (6) of the boiler No. 2.

3. The boiler start-stop adjusting system of the header unit according to claim 1, characterized in that a temperature gauge and a pressure gauge (7), an electric control valve (8), a feedback adjusting control valve (9) and a water return pipe (10) are arranged on a water outlet pipe between the high-pressure heater (2) of the boiler No. 1 and the economizer (6) of the boiler No. 2.

4. The start-stop regulating system of the main pipe unit boiler according to claim 3, characterized in that a flow control valve (11) is arranged on the water return pipe (10).

5. The start-stop regulating system of the boiler of the main control unit according to claim 3, characterized in that the position of the water return pipeline (10) is arranged at the downstream of the electric control valve (8) of the water outlet pipeline and at the upstream of the feedback regulation control valve (9).

6. The operation method of the start-stop regulating system of the boiler of the main pipe unit is characterized by comprising the following steps of;

when the load of the No. 1 unit is stable, the load of the No. 2 unit is reduced, and even the boiler needs to be shut down, the electric control valve (8) on the water outlet pipeline is opened, and the feedback regulation control valve (9) can automatically regulate water supply parameters according to the change of the load of the No. 2 unit, so that the water supply flow is properly increased, and the No. 2 boiler is ensured to be stably shut down; when the load of the No. 1 unit is stable, and the No. 2 unit needs to be started, the electric control valve (8) on the water outlet pipeline is in a full-open state, the water outlet of the high-pressure heater of the No. 1 unit enters a water supply system of a No. 2 boiler economizer (6), the water supply temperature is improved, the No. 2 boiler is ensured to be started stably, and at the moment, the feedback regulation control valve (9) can automatically regulate water supply parameters according to the load change of the No. 2 unit; when the loads of the No. 1 unit and the No. 2 unit are stable, the electric control valve (8) and the feedback regulation control valve (9) are kept at a gear with a smaller opening degree, the two units run stably, the feedback regulation control valve (9) only enables a small amount of effluent of the No. 1 high-pressure heater to enter the No. 2 boiler economizer (6), and the running state of a water supply system of the No. 2 unit can be optimized.

Technical Field

The invention belongs to the technical field of thermal power generating units, and particularly relates to a boiler start-stop adjusting system and method for a main pipe unit.

Background

In recent years, the ratio of new energy power generation is increased year by year, the operating environment of a thermal power generating unit is more and more changeable, and the thermal power generating unit mainly serves as a peak regulation unit to participate in operation. For most main control units, the form of 'two furnaces with one machine' is mainly adopted and limited by the lowest stable combustion load of the boiler, so that the load cannot be further reduced, and meanwhile, the loss of the boiler caused by the operation of a plurality of furnaces under the extremely low load is extremely large. Therefore, how to break through the technical application limit of the existing main control unit becomes the research focus at the present stage. If the problem that the second boiler is unstable in starting and stopping can be solved, the flexibility of the thermal power generating unit participating in peak shaving can be effectively improved, the coal consumption is further reduced, the service life of the unit is prolonged, and the method has great significance for energy conservation and emission reduction in China.

Disclosure of Invention

In order to overcome the defects in the prior art, the invention aims to provide a boiler start-stop adjusting system and method for a main pipe unit, which can effectively solve the problem of uneven heating when a second boiler of the main pipe unit is started and stopped, reduce the coal consumption and improve the flexibility of the thermal power unit participating in peak regulation.

In order to achieve the purpose, the invention adopts the technical scheme that:

a boiler start-stop adjusting system of a header unit comprises a No. 1 boiler high-pressure cylinder 1, a No. 1 boiler high-pressure heater 2, a No. 1 boiler economizer 3, a No. 2 boiler high-pressure cylinder 4, a No. 2 boiler No. 1 high-pressure heater 5 and a No. 2 boiler economizer 6 which are arranged in a high-pressure cylinder water outlet system;

the one-level steam extraction of 1 No. 1 boiler high pressure cylinder 1 is connected to 1 No. 1 boiler high pressure heater 2, and the play water of high pressure heater 2 is divided into two the tunnel, and the first way inserts in 3 water supply systems of 1 No. boiler economizer, and the second way inserts in 6 water supply systems of 2 No. boiler economizer through the outlet conduit, and the one-level steam extraction of 2 No. 2 boiler high pressure cylinder 4 is connected to 1 No. 2 boiler high pressure heater 5, and the play water of high pressure heater inserts in 6 boiler economizer of 2 No. 2, and the feed water of 6 boiler economizer of 2 is become by the play water that comes from 1 No. 2 boiler high pressure heater and the play water of 5 boiler high pressure heater of 2 No. 2.

And a water outlet pipeline is arranged between the No. 1 boiler high-pressure heater 2 and the No. 2 boiler economizer 6.

And a temperature gauge and a pressure gauge 7, an electric control valve 8, a feedback regulation control valve 9 and a water return pipeline 10 are arranged on a water outlet pipeline between the No. 1 boiler high-pressure heater 2 and the No. 2 boiler economizer 6.

And a flow control valve 11 is arranged on the water return pipeline 10.

The position of the water return pipe 10 is arranged at the downstream of the electric control valve 8 of the water outlet pipe and at the upstream of the feedback regulation control valve 9.

An operation method of a boiler start-stop regulation system of a main pipe unit comprises the following steps;

when the load of the No. 1 unit is stable, the load of the No. 2 unit is reduced, and even the boiler needs to be shut down, the electric control valve 8 on the large water outlet pipeline is opened, and the feedback regulation control valve 9 can automatically regulate water supply parameters according to the change of the load of the No. 2 unit, so that the water supply flow is properly increased, and the stable boiler shutdown of the No. 2 boiler is ensured; when the load of the No. 1 unit is stable, and the No. 2 unit needs to be started, the electric control valve 8 on the water outlet pipeline is in a full-open state, the outlet water of the high-pressure heater of the No. 1 unit enters a water supply system of a No. 2 boiler economizer 6, the water supply temperature is improved, the No. 2 boiler is ensured to be started stably, and at the moment, the feedback regulation control valve 9 can automatically regulate water supply parameters according to the load change of the No. 2 unit; when the loads of the No. 1 unit and the No. 2 unit are stable, the electric control valve 8 and the feedback regulation control valve 9 are kept at a gear with a smaller opening degree, the two units run stably, the feedback regulation control valve 9 only enables a small amount of effluent of the No. 1 high-pressure heater to enter the No. 2 boiler economizer 6, and the running state of a water supply system of the No. 2 unit can be optimized.

The invention has the beneficial effects that:

according to the invention, the high-pressure heater effluent of the boiler No. 1 is connected with the boiler No. 2 economizer water supply system, so that the water supply temperature of the boiler No. 2 economizer is raised when the boiler No. 2 is started, the exhaust gas temperature of the boiler at a low-load stage is ensured, and the denitration system of the boiler No. 2 can be continuously and stably put into operation. In addition, the problems of low feed water temperature, nonuniform heating of a hearth and the like during starting of the boiler can be solved, so that the two units can further participate in peak shaving.

A thermometer and a pressure gauge are arranged on the water outlet pipeline from the high-pressure heater of the boiler 1 to the economizer of the boiler 2, and an electric regulating valve is arranged, so that the water outlet quantity can be continuously monitored and regulated, and the water supply system is ensured not to be over-temperature. The water outlet pipeline is also provided with a feedback regulation control valve, so that the water supply parameters can be regulated according to the load feedback of the No. 2 boiler, and the No. 1 and No. 2 units can stably run under various loads.

Compared with the method that most of the existing main pipe control units connect the high-pressure steam and the reheated steam of the No. 1 and No. 2 units, the method has the advantages of short pipeline, less investment, small pipeline pressure loss, stable system operation and high flexibility. The problem that the boiler and the steam turbine are difficult to dynamically coordinate when the main pipe control unit is started or the load is suddenly relieved can be solved.

Drawings

FIG. 1 is a schematic diagram of a process system of the present invention.

Description of reference numerals:

1 is boiler high pressure cylinder No. 1, 2 is boiler high pressure heater No. 1, 3 is boiler economizer No. 1, 4 is boiler high pressure cylinder No. 2, 5 is boiler No. 2 high pressure heater No. 1, 6 is boiler economizer No. 2, 7 is thermometer and pressure gauge, 8 is electric control valve, 9 is the feedback control valve.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

Referring to fig. 1, the boiler start-stop adjusting system for the header unit mainly comprises a boiler high-pressure cylinder 1 of the number 1, a boiler high-pressure heater 2 of the number 1, a boiler economizer 3 of the number 1, a boiler high-pressure cylinder 4 of the number 2, a boiler 1 high-pressure heater 5 of the number 2, a boiler economizer of the number 2, a water outlet pipeline of the boiler high-pressure heaters 2 to 2 of the number 6, a thermometer and a pressure gauge 7 arranged on the pipeline, an electric control valve 8 and a feedback adjusting control valve 9.

The invention divides the water outlet of the high-pressure heater 2 of the boiler No. 1 into two paths, one path is connected to the water supply system of the boiler No. 1 coal economizer 3, and the other path is connected to the water supply system of the boiler No. 2 coal economizer 6. This improvement can promote the feedwater temperature of economizer when 2 boilers start, guarantees the exhaust gas temperature of 2 boilers in the low-load stage, makes the deNOx systems of 2 boilers realize continuous, stable operation. The problems of low feed water temperature, nonuniform heating of a hearth and the like during starting of the boiler can be solved, so that the two units can further participate in peak shaving.

A thermometer and a pressure gauge 7 are arranged on the water outlet pipeline from the high-temperature heater of the No. 1 boiler to the economizer of the No. 2 boiler 6, and an electric regulating valve is arranged. The improvement can continuously monitor and adjust the water yield and ensure that the water supply system does not exceed the temperature.

A feedback regulation control valve 9 is arranged on the water outlet pipeline from the high-temperature heater of the No. 1 boiler to the economizer 6 of the No. 2 boiler. The improvement can adjust the water supply parameters according to the load feedback of the No. 2 boiler, so that the No. 1 and No. 2 units can stably run under various loads.

The working principle of the invention is as follows:

when the load of the No. 1 unit is stable, the load of the No. 2 unit is reduced, and even the boiler needs to be shut down, the electric regulating valve on the large water outlet pipeline is opened, and at the moment, the feedback regulating valve can automatically regulate water supply parameters according to the change of the load of the No. 2 unit, so that the water supply flow is properly increased, and the stable boiler shutdown of the No. 2 boiler is ensured; when the load of the No. 1 set is stable, and the No. 2 set needs to be started, the electric regulating valve on the water outlet pipeline is in a full-open state, the water outlet of the high-pressure heater of the No. 1 set enters a water supply system of a No. 2 boiler economizer 6, the water supply temperature is improved, the No. 2 boiler is ensured to be started stably, and at the moment, the feedback regulating valve can automatically regulate water supply parameters according to the load change of the No. 2 set; when the loads of the No. 1 unit and the No. 2 unit are stable, the electric regulating valve and the feedback regulating valve are kept in the gear with smaller opening degree, the two units run stably, the feedback regulating valve only enables a small amount of effluent of the No. 1 high-pressure heater to enter the No. 2 economizer, and the running state of a water supply system of the No. 2 unit can be optimized.