CN216518188U

CN216518188U - Boiler start-up phase steam utilizes system

Info

Publication number: CN216518188U
Application number: CN202122720447.4U
Authority: CN
Inventors: 庄猛; 朱士超; 郑建坡; 孙金; 崔建国
Original assignee: Binzhou Beihai Xinhe New Material Co ltd; Shandong Hongqiao New Material Co Ltd
Current assignee: Binzhou Beihai Xinhe New Material Co ltd; Shandong Hongqiao New Material Co Ltd
Priority date: 2021-11-09
Filing date: 2021-11-09
Publication date: 2022-05-13
Anticipated expiration: 2031-11-09

Abstract

The utility model aims to solve the technical problem of providing a steam utilization system at the boiler starting stage, which can reduce the discharge of steam below 500 ℃, shorten the starting time and achieve the effects of energy conservation and emission reduction, and comprises a boiler unit and a steam turbine generator unit, wherein a steam outlet 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.

Description

Boiler start-up phase steam utilizes system

Technical Field

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

Background

The steam outlet of the boiler unit is communicated with a steam turbine generator unit, the steam of 500 ℃ generated by the boiler unit enters the steam turbine generator unit, the steam turbine generator unit starts to operate to generate electricity, the steam is reduced to 300 ℃ from 500 ℃ after passing through the steam turbine generator, and the steam of 300 ℃ is directly merged into a steam supply main pipe to be used for supplying steam to a steam user side.

The boiler unit is formed by connecting a plurality of boiler machines in parallel, a large amount of oil, coal, electricity and other energy sources are needed for starting the boiler machines, and steam can be supplied to the steam turbine generator unit for use only when the temperature of the steam reaches more than 500 ℃. However, in the starting process of the boiler, the generated steam does not reach 500 ℃ immediately, but the steam temperature is 300-400 ℃, the steam in the temperature range cannot directly enter the steam turbine generator and must be discharged out of the boiler, or the overtemperature and overpressure of the boiler are caused. Therefore, the most conventional way is to arrange an external exhaust pipe on the boiler unit, and directly exhaust the steam which does not reach 500 ℃ to the atmosphere. When the steam generated in the boiler reaches 500 ℃, the external exhaust pipe is closed, and then steam supply is started to the steam turbine generator.

In practice, statistics shows that the boiler starting time is about 4 hours, and in the boiler starting operation process, a large amount of fuel is consumed, and steam is discharged and wasted in the whole process, so that a large amount of energy is wasted.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a steam utilization system at the starting stage of a boiler, which reduces the discharge of steam below 500 ℃, shortens the starting time and achieves the effects of energy conservation and emission reduction.

The utility model is realized by the following technical scheme:

a steam utilization system at a boiler starting stage comprises a boiler unit and a steam turbine generator unit, wherein a steam outlet 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.

Furthermore, a temperature and pressure reducing device is arranged between the boiler starting bypass main pipe and the steam supply main pipe.

Furthermore, a boiler starting bypass electric valve is arranged on the bypass pipeline.

Further, the opening temperature range of the boiler starting bypass electric valve is 300-500 ℃.

Further, the boiler unit comprises 4-6 boiler machines.

The working principle of the steam utilization system at the starting stage of the boiler is as follows:

boiler unit ignition begins to start, and when the steam of production did not reach 500 ℃, the outer exhaust pipe of boiler unit opened and was discharged vapour outward, and when steam reached 300 ℃, boiler unit opened the female pipe of boiler start bypass, and steam supplies vapour through the female pipe entering of boiler start bypass and supplies the female pipe of vapour, finally supplies vapour for the steam user end.

Compared with the prior art, the utility model has the following beneficial effects:

1. the utility model can control the starting time of the boiler unit to be about 2.5 hours, compared with the previous starting time, the starting time of the boiler unit is shortened by more than 1 hour, and the oil, coal and electricity consumption for starting the boiler are greatly saved;

steam in the boiler starting bypass main pipe is directly supplied to a steam user side, so that the steam is prevented from being completely discharged to the atmosphere, the steam is fully utilized, the energy loss is greatly reduced, and the effects of energy conservation and emission reduction are achieved;

2. a temperature and pressure reducing device is arranged between the boiler starting bypass main pipe and the steam supply main pipe, if the steam in the boiler starting bypass main pipe exceeds 300 ℃, the temperature can be controlled to 300 ℃ through the temperature and pressure reducing device, and therefore the use of a steam user side is met;

3. the utility model has simple structure and convenient maintenance, and accords with the concept of energy conservation and emission reduction of boilers.

Drawings

FIG. 1 is a schematic structural diagram of a steam utilization system in a start-up stage of a boiler according to the present invention;

FIG. 2 is a schematic view of one of the boiler machines;

in the figure, 1, a boiler unit, 2, a steam turbine generator unit, 3, a temperature and pressure reducing device, 4, a boiler starting bypass main pipe, 5, a boiler steam stop valve, 6, a boiler starting bypass electric valve, 7, a temperature and pressure reducing station steam inlet valve, 8, a temperature and pressure reducing station steam outlet valve, 9 and a steam supply main pipe.

Detailed Description

The technical solutions in the embodiments of the present application will be described clearly and completely with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present application without making any creative effort, shall fall within the protection scope of the present application.

As shown in fig. 1-2, the present embodiment discloses a steam utilization system for a boiler start-up stage, which mainly includes a boiler unit 1, a turbo generator unit 2, a temperature and pressure reducer 3, and a boiler start-up bypass main pipe 4. In this embodiment, the boiler unit 1 is formed by connecting four boiler units in parallel, a steam outlet of each boiler unit is communicated with the steam turbine generator unit 2 through a steam supply pipe, and a boiler steam stop valve 5 is arranged on the steam supply pipe. The steam outlet of each boiler machine is connected with a boiler starting bypass main pipe 4 through a bypass pipeline, a boiler starting bypass electric valve 6 is arranged on the bypass pipeline, and the boiler steam stop valve 5 and the boiler starting bypass electric valve 6 are controlled to be opened and closed by an electric control system.

The temperature and pressure reducer 3 is a device for reducing the temperature and pressure of steam, and functions to reduce high-temperature and high-pressure steam into low-pressure and low-temperature steam (which may be superheated steam) that can be used by a user. In this embodiment, the steam inlet end of the temperature and pressure reducing device 3 is provided with a steam inlet valve 7 of the temperature and pressure reducing station, the steam outlet end of the temperature and pressure reducing device 3 is provided with a steam outlet valve 8 of the temperature and pressure reducing station, the tail end of the boiler starting bypass main pipe 4 is communicated with the steam inlet valve 7 of the temperature and pressure reducing station, the steam outlet valve 8 of the temperature and pressure reducing station is communicated with a steam supply main pipe 9, and the steam supply main pipe 9 is used for supplying steam to a steam user side.

The working process of the steam utilization system at the starting stage of the boiler is as follows:

boiler unit 1 igniteing and begins to start, when beginning to produce steam, and the steam that produces does not reach 500 ℃, boiler stop valve 5 is in the closed condition, boiler unit 1 does not supply vapour for turbo generator set 2, at this moment, boiler unit 1's outer tub of discharging opens and outwards discharges vapour (omits this structure in the figure), when steam reaches 300 ℃, boiler start bypass electric valve 6 on boiler unit 1's the bypass pipeline is opened, a part steam that boiler unit 1 produced gets into in the female pipe 4 of boiler start bypass, steam gets into and supplies the female pipe 9 of vapour after the steam that the temperature reduction pressure reducer 3 handled into 300 ℃, finally supply vapour for the steam user side. When the steam generated by the boiler unit 1 reaches 500 ℃, the exhaust pipe and the boiler starting bypass electric valve 6 are both closed, the boiler steam stop valve 5 is in an open state, and the boiler unit 1 supplies steam for the steam turbine generator unit 2.

According to the utility model, a part of steam which does not reach 500 ℃ is transferred to a steam user side through the boiler starting bypass main pipe, so that the discharge speed of the steam is increased, the steam generated by the boiler unit quickly reaches 500 ℃, the starting time of the boiler unit is shortened, compared with the previous starting time (4 hours), 1 hour is shortened, more than one hour is shortened, and the oil consumption, coal consumption and electricity consumption for starting the boiler are greatly saved; and the steam is fully utilized, so that the energy loss is greatly reduced, and the effects of energy conservation and emission reduction are achieved.

Claims

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.