CN216518188U - Boiler start-up phase steam utilizes system - Google Patents

Abstract

The technical problem to be solved by the utility model is to provide a steam utilization system in the start-up stage of the boiler, which can reduce the discharge of steam below 500°C, shorten the start-up time, and achieve the effect of energy saving and emission reduction, which includes a boiler unit and a steam turbine generator unit. The steam outlet of the boiler unit is connected to the steam turbine generator unit, and it is characterized in that it further includes a boiler startup bypass main pipe, and the steam outlet of the boiler group is connected to the boiler startup bypass main pipe through a bypass pipe; the boiler startup bypass main pipe; The end of the startup bypass main pipe is connected to the steam supply main pipe, and the steam supply main pipe is used for supplying steam to the steam user end.

Description

A steam utilization system in the start-up stage of a boiler

technical field

The utility model relates to the technical transformation field of boiler energy saving and emission reduction, in particular to a steam utilization system in the start-up stage of a boiler.

Background technique

The steam outlet of the boiler unit is connected to the steam turbine generator unit. The steam generated by the boiler unit at 500°C enters the steam turbine generator unit. The steam turbine generator unit starts to operate to generate electricity. The steam is directly merged into the steam supply main pipe for supplying steam to the steam user end.

The boiler unit is composed of multiple boiler units in parallel. The startup of the boiler unit requires a large amount of energy such as oil, coal, and electricity, and the steam needs to reach above 500 ℃ before it can be supplied to the steam turbine generator unit for use. However, during the startup process of the boiler, the steam generated does not reach 500°C immediately, but the steam temperature is between 300°C and 400°C. The steam in this temperature range cannot directly enter the turbine generator, and must be discharged out of the boiler, otherwise Cause the boiler to overheat and overpressure. Therefore, the most common way is to set an external exhaust pipe on the boiler unit to directly discharge the steam that does not reach 500 °C into the atmosphere. When the steam generated in the boiler reaches 500 °C, the outer exhaust pipe will be closed, and then the steam will be supplied to the turbo-generator.

According to statistics in practice, the start-up time of the boiler is about 4 hours. During the start-up operation of the boiler, not only a large amount of fuel is consumed, but also the steam is wasted in the whole process, resulting in a large amount of energy waste.

Utility model content

The technical problem to be solved by the utility model is to provide a steam utilization system in the start-up stage of the boiler, which can reduce the discharge of steam below 500°C, shorten the start-up time, and achieve the effect of energy saving and emission reduction.

The utility model is achieved through the following technical solutions:

A boiler start-up stage steam utilization system, comprising a boiler unit and a steam turbine generator unit, the steam outlet of the boiler unit is connected to the steam turbine generator unit, and it is characterized in that it also includes a boiler start-up bypass main pipe, the boiler unit The steam outlet of the boiler is connected to the boiler startup bypass main pipe through a bypass pipe;

The end of the boiler startup bypass main pipe is connected to the steam supply main pipe, and the steam supply main pipe is used for supplying steam to the steam user end.

Further, a desuperheater and pressure reducer is arranged between the boiler startup bypass main pipe and the steam supply main pipe.

Further, the bypass pipeline is provided with a boiler startup bypass electric valve.

Further, the opening temperature range of the boiler startup bypass electric valve is 300°C to 500°C.

Further, the boiler unit includes 4-6 boiler units.

The working principle of the steam utilization system at the start-up stage of the boiler described in the utility model is as follows:

The boiler unit starts to ignite and starts, and when the generated steam does not reach 500 °C, the outer exhaust pipe of the boiler unit is opened to discharge steam to the outside. When the steam reaches 300 °C, the boiler unit opens the boiler to start the bypass bus, and the steam passes through the boiler to start the bypass bus. The pipe enters the steam supply main pipe, and finally supplies steam to the steam user end.

Compared with the prior art, the beneficial effects obtained by the present utility model are as follows:

1. Part of the steam that does not reach 500°C is transferred to the steam user end through the boiler startup bypass main pipe, so as to increase the steam discharge rate, so that the steam generated by the boiler unit can quickly reach 500°C and shorten the start-up time of the boiler unit. The utility model can control the start-up time of the boiler unit to about 2.5 hours, which is shortened by more than 1 hour compared with the previous start-up time, and greatly saves the oil, coal and electricity consumption for the boiler start-up;

In addition, the steam in the boiler startup bypass main pipe is directly supplied to the steam user end, preventing all the steam from being discharged into the atmosphere, making full use of the steam, greatly reducing the energy loss, and achieving the effect of energy saving and emission reduction;

2. There is a desuperheater and pressure reducer between the boiler start-up bypass main pipe and the steam supply main pipe. If the steam in the boiler start-up bypass main pipe exceeds 300°C, it can be controlled to 300°C through the desuperheater and pressure reducer, so as to meet the Steam client use;

3. The utility model has the advantages of simple structure and convenient maintenance, and conforms to the concept of energy saving and emission reduction of boilers.

Description of drawings

Fig. 1 is the structural schematic diagram of the steam utilization system in the boiler start-up stage of the utility model;

Figure 2 is a schematic structural diagram of one of the boiler machines;

In the picture: 1. Boiler unit, 2. Turbine generator unit, 3. Desuperheater and pressure reducer, 4. Boiler startup bypass main pipe, 5. Boiler steam shut-off valve, 6. Boiler startup bypass electric valve, 7. The inlet steam valve of the desuperheating and decompression station, 8. the steam outlet valve of the desuperheating and decompression station, 9. the steam supply main pipe.

Detailed ways

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

As shown in FIGS. 1-2 , the present embodiment discloses a steam utilization system in the start-up phase of a boiler, which mainly includes a boiler unit 1 , a steam turbine generator unit 2 , a desuperheater and pressure reducer 3 , and a boiler start-up bypass main pipe 4 . In this embodiment, the boiler unit 1 is composed of four boiler units in parallel. The steam outlet of each boiler unit is connected to the steam turbine generator unit 2 through a steam supply pipe, and a boiler steam shut-off valve 5 is arranged on the steam supply pipe. The steam outlet of each boiler machine is connected to the boiler start-up bypass main pipe 4 through a bypass pipe, and a boiler start-up bypass electric valve 6 is arranged on the bypass pipe. The boiler steam cut-off valve 5 and the boiler start-up bypass electric valve 6 have electric power The control system controls opening and closing.

The desuperheating and pressure reducing device 3 is a device for reducing the temperature and pressure of the steam, and its function is to reduce the high-temperature and high-pressure steam to the low-pressure and low-temperature steam (which can be superheated steam) that can be used by the user. In the present embodiment, the inlet end of the desuperheating and pressure reducing device 3 is provided with a steam inlet valve 7 of the desuperheating and decompression station, and the steam outlet end of the desuperheating and decompressing device 3 is provided with a steam outlet valve 8 of the desuperheating and decompression station. The end of the boiler startup bypass main pipe 4 is connected to the steam inlet valve 7 of the desuperheating and decompression station, and the steam outlet valve 8 of the desuperheating and decompression station is connected to the steam supply main pipe 9, which is used to supply steam to the steam user end.

The working process of the steam utilization system in the boiler startup phase of the utility model is as follows:

Boiler unit 1 starts to ignite and starts. When steam starts to be generated, and the generated steam does not reach 500 °C, the boiler steam cut-off valve 5 is closed, and the boiler unit 1 does not supply steam for the turbo-generator unit 2. At this time, the boiler unit 1 The outer exhaust pipe is opened to exhaust steam to the outside (the structure is omitted in the figure). When the steam reaches 300 °C, the boiler start-up bypass electric valve 6 on the bypass pipe of the boiler unit 1 is opened, and a part of the steam generated by the boiler unit 1 enters the boiler to start. In the bypass main pipe 4, the steam is processed into steam at 300°C by the desuperheater and pressure reducer 3, and then enters the steam supply main pipe 9, and finally supplies steam to the steam user end. When the steam generated by the boiler unit 1 reaches 500°C, the exhaust pipe and the electric valve 6 of the boiler start-up bypass are closed, the boiler steam cut-off valve 5 is in the open state, and the boiler unit 1 supplies steam for the turbo-generator unit 2.

The utility model transfers a part of the steam that does not reach 500°C to the steam user end through the boiler startup bypass main pipe, thereby increasing the steam discharge speed, making the steam generated by the boiler unit reach 500°C quickly, and shortening the start-up time of the boiler unit. Compared with the previous start-up time (4 hours), it is shortened by more than 1 hour, which greatly saves the oil, coal and electricity consumption for boiler startup; and makes full use of steam, which greatly reduces energy loss and achieves the effect of energy saving and emission reduction .

Claims (3)

1. A steam utilization system at a boiler starting stage comprises a boiler unit and a steam turbine generator unit, wherein a steam outlet steam supply pipe of the boiler unit is communicated with the steam turbine generator unit;

the tail end of the boiler starting bypass main pipe is communicated with a steam supply main pipe, and the steam supply main pipe is used for supplying steam to a steam user side;

and a temperature and pressure reducer is arranged between the boiler starting bypass main pipe and the steam supply main pipe, and a boiler starting bypass electric valve is arranged on the bypass pipeline.

2. The steam utilization system in the boiler start-up phase according to claim 1, wherein the start-up temperature of the electric valve of the boiler start-up bypass is in a range of 300 ℃ to 500 ℃.

3. A boiler start-up phase steam utilization system according to any one of claims 1-2, characterized in that the boiler plant comprises 4-6 boiler machines.

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