CN212376705U

CN212376705U - Recovery system of residual pressure waste heat in backpressure heat supply unit

Info

Publication number: CN212376705U
Application number: CN202020812950.5U
Authority: CN
Inventors: 毛刚; 金宇航; 朱佳斌; 周姣; 梁小丽; 吴俊芬; 徐雪莹; 王纯; 夏积恩; 戴佳栩; 寿恩广; 刘含文
Original assignee: China United Engineering Corp Ltd
Current assignee: China United Engineering Corp Ltd
Priority date: 2020-05-15
Filing date: 2020-05-15
Publication date: 2021-01-19
Anticipated expiration: 2030-05-15

Abstract

The utility model provides a recovery system of excess pressure waste heat in backpressure heat supply unit can reduce the loss of water, heat and pressure energy, increases the heat supply load of backpressure heat supply unit, eliminates the phenomenon of "emitting white smoke". The steam outlet of the back pressure turbine is connected with the deaerator through a main pipeline, and a first valve, a steam jet pump and a second valve are sequentially arranged on the main pipeline; the bypass pipeline is connected with the main pipeline in parallel, and a third valve and a fourth valve are sequentially arranged on the bypass pipeline; the steam extraction port of the steam jet pump is connected with the periodical pollution discharge flash tank through a pipeline, and a fifth valve is arranged on the pipeline; the steam extraction port of the steam jet pump is connected with the drainage flash tank through a pipeline, and a number six valve is arranged on the pipeline; the steam extraction port of the steam jet pump is connected with the drain tank through a pipeline, and a seventh valve is arranged on the pipeline.

Description

Recovery system of residual pressure waste heat in backpressure heat supply unit

Technical Field

The utility model relates to a recovery system of excess pressure waste heat in backpressure heat supply unit.

Background

1. In traditional backpressure heat supply unit, the backpressure steam extraction pressure of external network heat supply often can not match with the heating steam pressure of oxygen-eliminating device, and in order to satisfy external network heat supply's requirement, the heat supply steam of oxygen-eliminating device often will be through throttle decompression, desuperheating, and this is because the waste of throttle decompression must just form the pressure energy.

2. In traditional backpressure heat supply unit, must set up dilatation devices such as periodic blowdown flash tank, hydrophobic flash tank, drain tank, the exhaust of these devices often leads to the atmosphere, often can form the phenomenon of "giving off white smoke", and this kind of phenomenon not only lets the visual effect who influences whole steam power plant easily, still can increase the loss of hot power system normal water and heat in the power plant.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome the above-mentioned not enough that exists among the prior art, and provide a recovery system of excess pressure waste heat in the backpressure heat supply unit that structural design is reasonable, can reduce the loss of water, heat and pressure energy, increase the heat supply volume of backpressure heat supply unit, eliminate the phenomenon of "running white cigarette".

The utility model provides a technical scheme that above-mentioned problem adopted is: a recovery system of residual pressure waste heat in a backpressure heat supply unit comprises a backpressure steam turbine, a deaerator, a drain tank, a drain flash tank and a periodic blowdown flash tank; the method is characterized in that: the steam injection device also comprises a first valve, a second valve, a third valve, a fourth valve, a fifth valve, a sixth valve, a seventh valve, a steam injection pump, a main pipeline and a bypass pipeline; the steam outlet of the back pressure turbine is connected with the deaerator through a main pipeline, and a first valve, a steam jet pump and a second valve are sequentially arranged on the main pipeline; the bypass pipeline is connected with the main pipeline in parallel, and a third valve and a fourth valve are sequentially arranged on the bypass pipeline; the steam extraction port of the steam jet pump is connected with the periodical pollution discharge flash tank through a pipeline, and a fifth valve is arranged on the pipeline; the steam extraction port of the steam jet pump is connected with the drainage flash tank through a pipeline, and a number six valve is arranged on the pipeline; the steam extraction port of the steam jet pump is connected with the drain tank through a pipeline, and a seventh valve is arranged on the pipeline.

The utility model discloses still include the outer net and use heat facility, the outer net is connected with back pressure steam turbine's steam outlet with heat facility.

The utility model discloses still include the governing valve, No. three valves, governing valve and No. four valves are installed in proper order on the bypass pipeline.

A valve, No. two valves, No. three valves, No. four valves be manual gate valve, No. five valves, No. six valves, No. seven valves are electric gate valve.

Compared with the prior art, the utility model, have following advantage and effect:

1. the residual pressure loss caused by deoxidizing and heating steam can be recovered, and the heat supply amount of the back pressure heat supply unit is increased.

2. The loss of water and heat in a thermodynamic system is reduced, the phenomenon of white smoke emission is eliminated, and the production environment of the thermal power plant can be beautified.

Drawings

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

Detailed Description

The present invention will be described in further detail by way of examples with reference to the accompanying drawings, which are illustrative of the present invention and are not intended to limit the present invention.

Referring to fig. 1, the utility model discloses a valve 1, No. 2, No. 3, No. 4, No. 5, No. six valves 6, No. 7, back pressure steam turbine 8, heat facility 9, steam jet pump 10, governing valve 11, oxygen-eliminating device 12, drain trap 13, drainage flash tank 1, periodic blowdown flash tank 15, main line 16 and bypass line 17 for the external network.

The steam outlet of the back pressure turbine 8 is connected with a deaerator 12 through a main pipeline, and a first valve 1, a steam jet pump 10 and a second valve 2 are sequentially installed on the main pipeline 16. Wherein the steam jet pump 10 has an inlet and an outlet connected to the main pipeline 16.

The bypass pipeline 17 is connected with the main pipeline 16 in parallel, and the third valve 3, the regulating valve 11 and the fourth valve 4 are sequentially arranged on the bypass pipeline 17.

The steam extraction port of the steam jet pump 10 is connected with a periodic blowdown flash tank 15 through a pipeline, and a fifth valve 5 is installed on the pipeline. The steam extraction port of the steam jet pump 10 is connected with a drain flash tank 14 through a pipeline, and a number six valve 6 is installed on the pipeline. The steam extraction port of the steam jet pump 10 is connected with a drain tank 13 through a pipeline, and a seventh valve 7 is installed on the pipeline.

The first valve 1, the second valve 2, the third valve 3 and the fourth valve 4 are all manual gate valves, and the fifth valve 5, the sixth valve 6 and the seventh valve 7 are all electric gate valves.

The heat device 9 for the outer grid is connected to the exhaust port of the back pressure turbine 8.

And in normal operation, the third valve 3 and the fourth valve 4 are closed, the first valve 1 and the second valve 2 are opened, and the fifth valve 5, the sixth valve 6 and the seventh valve 7 are opened simultaneously. The exhaust steam of the back pressure turbine 8 is high pressure steam, and is sent to the steam jet pump 10 as working steam, so that after the steam jet pump 10 extracts the exhaust steam of the periodic blowdown flash tank 15, the drainage flash tank 14 and the drainage box 13, the pressure is reduced to medium pressure steam which can be utilized by the deaerator, and the medium pressure steam enters the deaerator 12. Therefore, working medium and heat of the exhausted steam of the periodic blowdown flash tank 15, the drainage flash tank 14 and the drainage tank 13 can be recovered, the consumption of high-pressure steam for deoxygenation and heating is reduced, and more heat can be supplied to an external network heat utilization device.

If the steam jet pump 10 breaks down during operation, the third valve 3 and the fourth valve 4 of the bypass are opened, and the first valve 1 and the second valve 2 are closed, so that the system can continue to work, and the continuous operation of the system is ensured.

In addition, it should be noted that the specific embodiments described in the present specification may be different in the components, the shapes of the components, the names of the components, and the like, and the above description is only an example of the structure of the present invention. All the equivalent changes or simple changes made according to the structure, characteristics and principle of the utility model are included in the protection scope of the utility model. Various modifications, additions and substitutions may be made by those skilled in the art without departing from the scope of the invention as defined in the accompanying claims.

Claims

1. A recovery system of residual pressure waste heat in a backpressure heat supply unit comprises a backpressure steam turbine, a deaerator, a drain tank, a drain flash tank and a periodic blowdown flash tank; the method is characterized in that: the steam injection device also comprises a first valve, a second valve, a third valve, a fourth valve, a fifth valve, a sixth valve, a seventh valve, a steam injection pump, a main pipeline and a bypass pipeline; the steam outlet of the back pressure turbine is connected with the deaerator through a main pipeline, and a first valve, a steam jet pump and a second valve are sequentially arranged on the main pipeline; the bypass pipeline is connected with the main pipeline in parallel, and a third valve and a fourth valve are sequentially arranged on the bypass pipeline; the steam extraction port of the steam jet pump is connected with the periodical pollution discharge flash tank through a pipeline, and a fifth valve is arranged on the pipeline; the steam extraction port of the steam jet pump is connected with the drainage flash tank through a pipeline, and a number six valve is arranged on the pipeline; the steam extraction port of the steam jet pump is connected with the drain tank through a pipeline, and a seventh valve is arranged on the pipeline.

2. The recovery system of residual pressure and waste heat in a back pressure heat supply unit according to claim 1, characterized in that: the system also comprises a heat device for the outer net, and the heat device for the outer net is connected with the steam outlet of the back pressure turbine.

3. The recovery system of residual pressure and waste heat in a back pressure heat supply unit according to claim 1, characterized in that: the three-way valve, the regulating valve and the four-way valve are sequentially arranged on the bypass pipeline.

4. The recovery system of residual pressure and waste heat in a back pressure heat supply unit according to claim 1, characterized in that: the first valve, the second valve, the third valve and the fourth valve are all manual gate valves, and the fifth valve, the sixth valve and the seventh valve are all electric gate valves.