阅读说明：本技术 一种用于多压凝汽器的冷却系统及方法 (Cooling system and method for multi-pressure condenser ) 是由 胡芳芳 颜晓辉 于 2020-08-13 设计创作，主要内容包括：本发明涉及一种用于多压凝汽器的冷却系统及方法,包括凝汽组件、冷却组件和采暖组件。凝汽组件包括多缸多排汽汽轮机组、凝汽器和回转堵板,凝汽器连接至多缸多排汽汽轮机组的每个缸,相邻凝汽器之间通过回转堵板连接；冷却组件包括循环水进水管道和循环水回水管道,凝汽器的第一进水管道与循环水进水管道相连通,凝汽器上连有第一回水管道,第一回水管道与循环回水管道相连；采暖组件包括热网加热器、供水连接管道、热网供水管道和热网回水管道,第一进水管道上连有第二进水管道,第二进水管道与热网回水管道相连接,第一回水管道上均连接有第二回水管道,第二回水管道均与供水连接管道连通,热网加热器连接在供水连接管道和热网供水管道之间。(The invention relates to a cooling system and a method for a multi-pressure condenser. The condensing assembly comprises a multi-cylinder multi-exhaust steam turbine set, condensers and a rotary blocking plate, the condensers are connected to each cylinder of the multi-cylinder multi-exhaust steam turbine set, and adjacent condensers are connected through the rotary blocking plate; the cooling component comprises a circulating water inlet pipeline and a circulating water return pipeline, a first water inlet pipeline of the condenser is communicated with the circulating water inlet pipeline, the condenser is connected with a first return pipeline, and the first return pipeline is connected with the circulating water return pipeline; the heating assembly comprises a heat supply network heater, a water supply connecting pipeline, a heat supply network water supply pipeline and a heat supply network water return pipeline, a second water inlet pipeline is connected to the first water inlet pipeline and is connected with the heat supply network water return pipeline, the first water return pipeline is connected with a second water return pipeline, the second water return pipeline is communicated with the water supply connecting pipeline, and the heat supply network heater is connected between the water supply connecting pipeline and the heat supply network water supply pipeline.)

1. A cooling system for a multi-pressure condenser, comprising:

the condenser assembly comprises a plurality of multi-cylinder multi-exhaust steam turbine units, condensers and rotary blocking plates, each condenser is connected to each cylinder of the multi-cylinder multi-exhaust steam turbine unit, and adjacent condensers are connected through the rotary blocking plates;

the cooling assembly comprises a circulating water inlet pipeline and a circulating water return pipeline, wherein each condenser is connected with a first water inlet pipeline which is communicated with the circulating water inlet pipeline, and each condenser is connected with a first return pipeline which is communicated with the circulating water return pipeline;

heating subassembly, heating subassembly includes heat supply network heater, water supply connecting pipe, heat supply network water supply pipe and heat supply network return water pipe, all is connected with the second inlet channel on every first inlet channel, the second inlet channel all with heat supply network return water pipe is connected, all is connected with the second return water pipe on every first return water pipe, the second return water pipe all with water supply connecting pipe is linked together, heat supply network heater input with water supply connecting pipe is connected, the output of heat supply network heater with heat supply network water supply pipe is connected, first inlet channel all be equipped with the valve on first return water pipe, second inlet channel and the second return water pipe.

2. The cooling system for a multi-pressure condenser according to claim 1, wherein the heating module further comprises a heat supply network circulating water pump connected to the water supply connection pipe.

3. The cooling system for the multi-pressure condenser according to claim 1, wherein the condenser assembly further comprises a plurality of first connecting pipes, adjacent condensers are connected through the connecting pipes, and each connecting pipe is provided with a rotary blocking plate.

4. The cooling system for a multi-pressure condenser as claimed in claim 1, wherein the back pressure of the condenser increases sequentially from being far from the heat grid heater to being close to the heat grid heater.

5. The cooling system for a multi-pressure condenser as claimed in claim 1, wherein the valve is a butterfly valve.

6. A cooling method for a multi-pressure condenser is characterized by comprising the following steps:

the exhaust steam of each cylinder of the multi-cylinder multi-exhaust steam turbine set is discharged into each condenser;

in the heating period, the rotary blocking plates between adjacent condensers are opened, the circulating water of the heat supply network of each condenser enters a heat supply network heater for heating and then enters a water supply pipeline of the heat supply network for heating, and the return water of a return water pipeline of the heat supply network enters the condensers;

and in the non-heating period, the rotary blocking plate between the adjacent condensers is closed, the butterfly valve on the pipeline between each condenser and the heat supply network heater is closed, the circulating water of each condenser is discharged to the cooling tower through a circulating water inlet pipeline, and the return water of the cooling tower enters the condenser through a circulating water return pipeline.

7. The cooling method for the multi-pressure condenser according to claim 6, wherein the heat supply network circulating water of the condenser enters the heat supply network heater after being boosted by the heat supply network circulating water pump.

Technical Field

The application relates to the technical field of energy conservation of power plants, in particular to a cooling system and a cooling method for a multi-pressure condenser.

Background

High back pressure heating is a high efficiency heating technology which is rapidly developed in recent years. A typical high back pressure heating scheme is: and in the heat supply period, the exhaust back pressure of the steam turbine is improved, the outlet and the inlet of the circulating cooling water of the condenser are directly connected into a heat supply system, and the circulating cooling water of the heat supply network is used as the circulating cooling water of the condenser. The circulating water can be supplied with heat by adopting a series-connection heating system. The heat supply network circulating water is firstly heated by the condenser for the first time to absorb the latent heat of low-pressure cylinder exhaust steam, then is heated by the steam heater of the heat supply primary station for the second time to generate high-temperature hot water, and the high-temperature hot water is sent to a hot water pipe network to exchange heat with the second-stage heat supply network circulating water through the second-stage heat exchange station, and then returns to the condenser of the unit after being cooled by the water of the heat supply network to form a complete cycle, wherein the steam source of the heat supply primary station can be selected from.

However, the problem of how to better perform heating in a multi-cylinder multi-row steam turbine is not solved at present.

Disclosure of Invention

The application provides a cooling system and a cooling method for a multi-pressure condenser, and aims to solve the problem of how to perform heating circulation of a multi-cylinder multi-row steam turbine.

The technical scheme adopted by the application is as follows:

the invention provides a cooling system for a multi-pressure condenser, which comprises:

the condenser assembly comprises a plurality of multi-cylinder multi-exhaust steam turbine units, condensers and rotary blocking plates, each condenser is connected to each cylinder of the multi-cylinder multi-exhaust steam turbine unit, and adjacent condensers are connected through the rotary blocking plates;

the condenser comprises a cooling component, a circulating water inlet pipeline and a circulating water return pipeline, wherein each condenser is connected with a first water inlet pipeline which is communicated with the circulating water inlet pipeline, each condenser is connected with a first return pipeline which is communicated with the circulating water return pipeline;

heating subassembly, heating subassembly include heat supply network heater, water supply connecting pipe, heat supply network water supply pipe and heat supply network return water pipe, all are connected with the second inlet channel on every first inlet channel, the second inlet channel all with heat supply network return water pipe is connected, all is connected with the second return water pipe on every first return water pipe, the second return water pipe all with water supply connecting pipe is linked together, heat supply network heater input with water supply connecting pipe is connected, the output of heat supply network heater with heat supply network water supply pipe is connected, first inlet channel all be equipped with the valve on first return water pipe, second inlet channel and the second return water pipe.

The heating assembly further comprises a heat supply network circulating water pump, and the heat supply network circulating water pump is connected to the water supply connecting pipeline.

The condensing assembly further comprises a plurality of first connecting pipelines, adjacent condensers are connected through the connecting pipelines, and each connecting pipeline is provided with a rotary blocking plate.

The backpressure of condenser increases in proper order from keeping away from the heat supply network heater is close to the heat supply network heater.

The valve is a butterfly valve.

A cooling method for a multi-pressure condenser, comprising the steps of:

the exhaust steam of each cylinder of the multi-cylinder multi-exhaust steam turbine set is discharged into each condenser;

in the heating period, the rotary blocking plates between adjacent condensers are opened, the circulating water of the heat supply network of each condenser enters a heat supply network heater for heating and then enters a water supply pipeline of the heat supply network for heating, and the return water of a return water pipeline of the heat supply network enters the condensers;

and in the non-heating period, the rotary blocking plate between the adjacent condensers is closed, the butterfly valve on the pipeline between each condenser and the heat supply network heater is closed, the circulating water of each condenser is discharged to the cooling tower through a circulating water inlet pipeline, and the return water of the cooling tower enters the condenser through a circulating water return pipeline.

And the heat supply network circulating water of the condenser enters the heat supply network heater after being boosted by the heat supply network circulating water pump.

The technical scheme of the application has the following beneficial effects:

the invention relates to a cooling system and a method for a multi-pressure condenser, wherein the exhaust steam of a multi-cylinder multi-exhaust steam turbine set is connected to the outer layer of a tank shell of a corresponding condenser, different working media (circulating water and heat supply network circulating water) are adopted to cool the steam exhaust steam on the outer layer of the tank shell in the heat supply period, and flexible heat supply to the outside is realized; in the non-heat supply period, the steam exhaust of the outer layer of the tank shell is cooled by adopting water of the cooling tower, so that the heat exchange efficiency is improved, the work loss is reduced, the steam exhaust pressure is reduced, and the unit circulation efficiency is improved.

Drawings

In order to more clearly explain the technical solution of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious to those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a cooling system for a multi-pressure condenser according to a first embodiment of the present invention;

fig. 2 is a schematic structural diagram of a cooling system for a multi-pressure condenser according to a second embodiment of the present invention;

illustration of the drawings:

wherein, 1-the subassembly that condenses: 11-multi-cylinder multi-row steam turbine set; 12-a condenser; 13-a rotary blocking plate; 14-connecting a pipe;

2-cooling the assembly: 21-a circulating water inlet pipeline; 22-circulating water return pipeline; 23-a first water inlet conduit; 24-a first return conduit; 25-a second conduit;

3-heating component: 31-a heating network heater; 32-water supply connection pipe; 33-heat supply network water supply pipeline; 34-a heat supply network water return pipeline; 35-a second water inlet pipe; 36-a second water return pipe; 37-heat supply network circulating water pump.

Detailed Description

Reference will now be made in detail to embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following examples do not represent all embodiments consistent with the present application. But merely as exemplifications of systems and methods consistent with certain aspects of the application, as recited in the claims.

As shown in fig. 1, the cooling system for a multi-pressure condenser 12 provided by the present application includes a condensing assembly 1, a cooling assembly 2, and a heating assembly 3.

Specifically, the method comprises the following steps:

the condensing assembly 1 comprises a multi-cylinder multi-exhaust steam turbine set 11, condensers 12, first connecting pipelines 14 and rotary blocking plates 13, the number of the condensers 12 is four, the multi-cylinder multi-exhaust steam turbine set 11 is provided with four cylinders, each condenser 12 is connected to each cylinder of the corresponding multi-cylinder multi-exhaust steam turbine set 11, the outer layers of the shells of the adjacent condensers 12 are connected through the connecting pipelines 14, and each connecting pipeline 14 is provided with a rotary blocking plate 13;

the cooling component 2 comprises a circulating water inlet pipeline 21 and a circulating water return pipeline 22, the upper part of each condenser 12 is connected with a first return pipeline 24, the first return pipelines 24 are communicated with the circulating water return pipelines, the lower part of each condenser 12 is connected with a first water inlet pipeline 23, and the first water inlet pipelines 23 are communicated with the circulating water inlet pipeline 21;

heating subassembly 3 includes heat supply network heater 31, water supply connecting pipe 32, heat supply network water supply pipe 33 and heat supply network return water pipe 34, all is connected with second inlet channel 35 on every first inlet channel 23, second inlet channel 35 all with heat supply network return water pipe 34 is connected, all is connected with second return water pipe 36 on every first return water pipe 24, and second return water pipe 36 all is linked together with water supply connecting pipe 32, and heat supply network heater 31 input is connected with water supply connecting pipe 32, and heat supply network heater 31's output is connected with heat supply network water supply pipe 33, all is equipped with the butterfly valve on first inlet channel 23, first return water pipe 24, second inlet channel 35 and the second return water pipe 36.

The heating module 3 further includes a heat supply network circulating water pump 37, and the heat supply network circulating water pump 37 is connected to the water supply connection pipe 32.

The back pressure of the condenser 12 increases in the order from the distance from the heat supply network heater 31 to the proximity of the heat supply network heater 31 (increases in the order from the left to the back pressure).

A cooling method for a multi-pressure condenser 12, comprising the steps of:

the exhaust steam of each cylinder of the multi-cylinder multi-exhaust steam turbine set 11 is discharged into each condenser 12;

in the heating period, the rotary blocking plates 13 between the adjacent condensers 12 are opened, the circulating water of the heat supply network of each condenser 12 enters the heat supply network heater 31 for heating and then enters the water supply pipeline 33 of the heat supply network for heating, and the return water of the return water pipeline of the heat supply network enters the condenser 12;

in the non-heating period, the rotary blocking plate 13 between the adjacent condensers 12 is closed, the butterfly valve on the pipeline between each condenser 12 and the heat supply network heater 31 is closed, the circulating water of each condenser 12 is discharged to the cooling tower through the circulating water inlet pipeline 21, and the return water of the cooling tower enters the condenser 12 through the circulating water return pipeline.

The heat supply network circulating water of the condenser 12 enters the heat supply network heater 31 after being boosted by the heat supply network circulating water pump 37.

The valves are butterfly valves, and switching butterfly valves are additionally arranged on the first water inlet pipeline 23, the first water return pipeline 24, the second water inlet pipeline 35 and the second water return pipeline 36, so that a single condenser 12 can independently operate or can operate in series. The butterfly valve on the first water inlet pipeline 23 is close to the circulating water inlet pipeline 21, and the butterfly valve on the first water return pipeline 24 is close to the circulating water return pipeline 22.

In the embodiment, the neck parts of the condensers 12 are connected through the connecting pipeline 14, and the connecting pipeline 14 is provided with the rotary blocking plate 13, so that the chambers of the condensers 12 can be flexibly switched; the switching function of the condenser 12 between high back pressure and low back pressure is realized by adding the rotary blocking plate 13 between the condensers 12; when the rotary blocking plate 13 is opened, steam in different backpressure condenser cavities can flow through the condenser 12 in series in sequence, and the steam pressure value in two adjacent condensers 12 is kept consistent.

Steam exhaust of the multi-cylinder multi-row steam turbine unit 11 enters the outer layer of a tank shell of the condenser 12, the water in the tank shell of the condenser 12 condenses the steam exhaust of the outer layer of the tank shell, and the steam exhaust of the outer layer of the tank shell is condensed into condensed water so as to be conveniently pumped away for secondary utilization.

This embodiment is in the heating period:

for example, when the heating area is large, A, B, C, D four condensers 12 are used simultaneously, and three rotary blocking plates 13 of adjacent condensers 12 are opened, so that the pressures of the steam in the housings of A, B, C, D four condensers 12 are kept consistent, the steam in the condensers 12 can flow in series and sequentially, the second water inlet pipe 35 and the butterfly valve on each second water return pipe 36 are opened, so that the heat supply network circulating water in the four condensers 12 enters each second water return pipe 36 through the first water return pipe 24, enters the water supply connecting pipe 32 through each second water return pipe 36, enters the heat supply network heater 31 after being boosted by the heat supply network circulating water pump 37, and enters the heat supply network water supply pipe 33 after being heated by the heat supply network heater 31 for heating; the return water of the heat supply network enters each second water inlet pipeline 35 through the heat supply network return pipeline 34, enters the first water inlet pipeline 23 through the second water inlet pipeline 35, enters each condenser 12 through the first water inlet pipeline 23, obtains the latent heat of steam exhaust from the outer layer of the tank shell, enters the heat supply network heater 31 again to be heated and then is supplied to a heat user, and meanwhile, the circulating water return pipeline 22 is opened, so that the return water of the cooling tower in the circulating water return pipeline 22 also enters the condenser 12 through the first return pipeline 24 to obtain the latent heat and then enters the heat supply network heater 31 to supply heat;

when the heating area is small, different with the above-mentioned A, B, C, D four condensers 12 use simultaneously, use A, B, C three condenser 12, close the gyration closure plate 13 between D condenser 12 and C condenser 12, the butterfly valve on the first inlet channel 23, first return water pipe 24, second inlet channel 35 and the second return water pipe 36 of connecting on the D condenser 12 all closes, the butterfly valve on the first inlet channel 23, first return water pipe 24, second inlet channel 35 and the second return water pipe 36 on the A, B, C three condenser 12 is all opened, gyration closure plate 13 between A, B, C three condenser 12 is opened, can only operate A, B, C three condenser 12.

The four condensers 12 of the present embodiment may be operated simultaneously, or may be operated individually or in combination.

In the present embodiment, during the non-heating period:

the butterfly valves on each first water inlet pipeline 23 and each first water return pipeline 24 are opened, the butterfly valves on each second water inlet pipeline 35 and each second water return pipeline 36 are closed, each rotary blocking plate 13 is closed, circulating water of each condenser 12 enters the circulating water inlet pipeline 21 through each first water inlet pipeline 23, is discharged to the cooling tower through the circulating water inlet pipeline 21 to be cooled, returning water of the cooling tower enters each first water return pipeline 24 through the circulating water return pipeline 22, and enters the condenser 12 through the first water return pipeline 24 to condense steam exhaust steam on the outer layer of the shell of the condenser 12.

The method of the invention comprises the following steps of connecting the exhaust steam of a multi-cylinder multi-exhaust steam turbine set 11 to the outer layer of the tank shell of a corresponding condenser 12, cooling the steam exhaust steam of the outer layer of the tank shell by adopting different working media (circulating water and heat supply network circulating water) in the heat supply period, and realizing flexible heat supply to the outside; in the non-heat supply period, the steam exhaust of the outer layer of the tank shell is cooled by adopting water of the cooling tower, so that the heat exchange efficiency is improved, the work loss is reduced, the steam exhaust pressure is reduced, and the unit circulation efficiency is improved.