CN217844090U - High back pressure heat supply and peak cooling system of direct air cooling coal-fired generator set - Google Patents
High back pressure heat supply and peak cooling system of direct air cooling coal-fired generator set Download PDFInfo
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- CN217844090U CN217844090U CN202221819836.0U CN202221819836U CN217844090U CN 217844090 U CN217844090 U CN 217844090U CN 202221819836 U CN202221819836 U CN 202221819836U CN 217844090 U CN217844090 U CN 217844090U
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Abstract
The utility model discloses a coal-fired generating set high back pressure heat supply of direct air cooling holds concurrently peak cooling system carries out when implementing the coal-fired generating set high back pressure heat supply of direct air cooling and reforms transform the engineering and imitates the transformation, and the overall planning utilizes on-the-spot space arrangement equipment system, makes the unit can be in high-efficient operation during winter heat supply, can realize the high-efficient operation of heat supply off-stream back unit again. The method is characterized in that a condenser connected with an air cooling island in parallel is added to the direct air-cooling coal-fired unit, the air cooling island is closed to feed steam during heat supply, the exhaust steam of a steam turbine is introduced into the condenser, and the exhaust steam is condensed by the circulating water of a heat supply network entering the condenser, so that the temperature of the circulating water of the heat supply network is raised, and heat supply is realized; in a non-heat supply period, the air cooling island is started to perform parallel operation of steam inlet and the condenser, the heat supply network circulating water entering the condenser is stopped, the closed circulating water entering the condenser is put into operation, and the exhaust steam of the steam turbine entering the condenser is cooled, so that the operation backpressure of the unit is reduced, and the operation efficiency of the unit is improved.
Description
Technical Field
The utility model relates to an electric power field, concretely relates to coal-fired generating set of direct air cooling.
Background
The direct air-cooling coal-fired power generating unit has obvious water saving effect and is suitable for northern water-deficient areas, the heat supply demand in northern areas is large in winter, and after the direct air-cooling power generating unit is improved in high-back-pressure heat supply, the operation energy consumption is greatly reduced. However, after the heat supply period is finished and summer comes, the running back pressure of the air cooling unit is increased along with the increase of the environmental temperature, the energy consumption is greatly increased, and even the maximum output of the air cooling unit is limited. In order to reduce the energy consumption of the direct air cooling coal-fired unit during the heat supply shutdown period, the peak cooling efficiency improvement transformation is adopted in the current part of units, and the main technical route comprises the following steps: the peak spraying transformation technology of the air cooling island, the transformation technology of the evaporative peak cooler and the transformation technology of the wet cooling tower.
1. Air cooling island peak spraying transformation technology
The peak spraying modification technology for the air cooling island is that water mist is directly sprayed to cooling fins of an air cooling island cooling tube bundle of a direct air cooling unit to cool steam turbine exhaust steam entering the air cooling island tube bundle, and demineralized water is sprayed for water separation in order to prevent scaling corrosion of the tube bundle and the cooling fins caused by water spraying. The method has the advantages that the reconstruction system is simple, only the spray pipe network spray head and the spray pump group are needed to be added, the original demineralized water preparation system and the original demineralized water storage water tank of the power plant are utilized to meet the requirement of spraying water, and the reconstruction investment is small. The defects are that when the environmental temperature is lower than 20 ℃, the backpressure of a unit is not obviously reduced when the spraying is put into operation, and most of desalted water sprayed to the radiating fins of the air cooling island finally falls to the ground, so that the utilization efficiency is not high.
2. Evaporation type peak cooler improvement technology
The evaporative peak cooler is modified by directly introducing partial exhaust steam of a steam turbine of a direct air cooling unit into a plate-type or tubular heat exchanger module, uniformly spraying cooling water on the surface of a tube bundle of the plate-type or tubular heat exchanger module through a water supply system, absorbing heat carried by the exhaust steam of the steam turbine by using latent heat of evaporation of the cooling water to condense the exhaust steam of the steam turbine, and recovering condensed water to a steam turbine steam exhaust device along a pipeline. The method has the advantages of good cooling effect in the initial stage of operation after transformation, obvious reduction of the back pressure of the unit and obvious reduction of energy consumption. But three or five years after this system is put into operation, can appear tubular or plate heat exchanger module scale deposit jam to different degrees, the cooling effect reduces by a wide margin to the maintenance work load increases by a wide margin along with the increase of year of putting into operation, and the cooling module appears leaking when serious and withdraws from the operation.
3. Wet cooling tower transformation technology
The main equipment of the wet cooling tower modification technology comprises a condenser, a circulating water pump, a pipeline system and a wet cooling tower. When the direct air cooling unit is put into operation, partial exhaust steam of a turbine of the direct air cooling unit enters the condenser to be cooled by circulating water, and condensed water is recycled to the steam turbine steam exhaust device along a pipeline. And cooling the heated circulating water in a wet cooling tower. The method has the advantages of good cooling effect, obvious reduction of the back pressure of the unit, lower environmental temperature and operation of the system, and the conditional power plant can utilize the wet cooling tower system of the shut-down small unit. The disadvantage is that the cooling tower consumes a lot of water.
The three direct air cooling unit peak cooling efficiency improvement transformation technologies have advantages and disadvantages, and a peak cooling technology with good cooling effect, low water consumption, small transformation engineering amount and reasonable investment income needs to be developed.
With the deep promotion of national energy saving and emission reduction work, the central heating demand of northern cities is increased, part of direct air-cooling coal-fired units begin to implement high-back-pressure heating transformation, high-back-pressure heating needs to be additionally provided with a high-back-pressure condenser and a pipeline for introducing exhaust steam of a steam turbine, but after the heating period is finished, the high-back-pressure condenser and the pipeline for introducing the exhaust steam of the steam turbine are idle, and a new peak cooling transformation technology developed by utilizing the high-back-pressure condenser of the direct air-cooling coal-fired units has the conditions.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a coal-fired generating set high back pressure heat supply of direct air cooling holds concurrently peak cooling system, makes coal-fired generating set of direct air cooling carry high back pressure heat supply when imitating the transformation and reforms transform with the peak cooling and implement in the lump, the rational utilization site space, and the compatible use of equipment reduces the transformation expense, improves air cooling unit operation economy. The water consumption is small, the reconstruction workload is small, and the investment income is reasonable.
In order to achieve the purpose, the technical proposal of the utility model is that: a high back pressure heat supply and peak cooling system of a direct air cooling coal-fired generator set is characterized by comprising a condenser, a heat supply network circulating water system and a closed type cold circulating water system;
the heat supply network circulating water system comprises a heat supply network circulating water supply pipeline, a heat supply network circulating water supply isolation valve, a heat supply network circulating water return pipeline, a heat supply network circulating water return isolation valve, a heat supply network circulating water supply and return water communication pipeline and a heat supply network circulating water supply and return water communication valve;
the closed type cold circulating water system comprises a closed type circulating water supply pipeline, a closed type circulating water return pipeline, a water storage tank, a closed type cold circulating water pump and a closed type cooling tower, wherein the water inlet side of the water storage tank is connected with the circulating water return pipeline of the heating network, and the water outlet side of the water storage tank is connected with the inlet of the closed type cold circulating water pump;
the upper part of the condenser is connected with a pipeline from the exhaust steam of the steam turbine to the air cooling island through an exhaust steam to condenser pipeline of the air cooling island and an exhaust steam to condenser isolating valve of the steam turbine, and the bottom of the condenser is connected with a pipeline of a condensed water to steam exhaust device of the air cooling island through a condensed water delivery pump and a condensed water pipeline of the condenser;
the condenser condensation tube bundle is respectively connected with a heat supply network circulating water system and a closed cold circulating water system through a heat supply network circulating water supply pipeline and a heat supply network circulating water return pipeline; when heat is supplied in winter, the connection between the closed cold circulating water system and the condenser is closed, and the heat supply network circulating water system is put into operation; after the heat supply is finished, closing the connection between the heat supply network circulating water system and the condenser, and putting into a closed cold circulating water system;
the closed circulating water supply pipeline is connected with the heat supply network circulating water supply pipeline before the heat supply network circulating water return isolating valve, and the closed circulating water return pipeline is connected with the heat supply network circulating water return pipeline before the heat supply network circulating water return isolating valve.
Furthermore, before the exhaust steam of the steam turbine is discharged into the air cooling island through the steam discharging device, part of the steam is branched to enter the condenser, and the exhaust steam of the steam turbine entering the condenser can be cooled by the heat supply network circulating water system or the closed type cold circulating water system.
Furthermore, an axial flow fan is installed at the top of the closed cooling tower, a spraying pipe network and a cooling coil pipe are arranged in the closed cooling tower, a spraying reservoir and a spraying pump are arranged at the bottom of the closed cooling tower, and an air inlet is formed in the tower wall of the closed cooling tower.
Furthermore, the upper end of the cooling coil is connected with the condenser through a closed circulating water supply pipeline, and the lower end of the cooling coil is connected with a closed cold water circulating water pump through a closed cold water circulating water pump water pipeline.
The utility model discloses following beneficial effect has:
1. a condenser connected with an air cooling island in parallel is added in the direct air-cooling coal-fired unit, the air cooling island is closed to feed steam during heat supply, the exhaust steam of the steam turbine is introduced into the condenser, and the exhaust steam is condensed by the circulating water of the heat supply network entering the condenser, so that the temperature of the circulating water of the heat supply network is raised, and heat supply is realized; in a non-heat supply period, the parallel operation of the air cooling island steam inlet and the condenser is started, the heat supply network circulating water entering the condenser is stopped, the closed circulating water system entering the condenser is put into operation, the exhaust steam of the steam turbine entering the condenser is cooled, the unit operation backpressure is reduced, and the unit operation efficiency is improved.
2. When the direct air-cooling coal-fired unit carries out high back pressure heat supply transformation work, peak cooling transformation, unified design and implementation are carried out together, the space position can be reasonably utilized, transformation cost is reduced, and the unit operation energy efficiency is in a relatively better level at different periods.
3. The condenser can be used as a condenser of a high back pressure heat supply system and can also be used as a condenser of a closed circulating cooling water system.
4. And when the environmental temperature is higher in summer, the spraying pipe network is opened to input the spraying water of the closed tower, and the circulating water cooling coil is cooled. The closed circulating water system does not need to be put into operation for spraying when the environmental temperature is lower, can meet the requirements by air cooling, saves water, has low strict requirements on water quality, and can meet the requirements of common industrial water.
Drawings
Fig. 1 is a schematic diagram of the system structure of the present invention;
reference numbers in the figures: 1-a low pressure cylinder of the steam turbine; 2-steam exhaust steam of a steam turbine; 3-steam turbine exhaust; 4-a condensate pipe; 5, exhausting steam of a steam turbine to an air cooling island isolation valve; 6-an air cooling island; 7-exhausting steam of the steam turbine to an air cooling island pipeline; 8-air cooling island condensed water isolation valve; 9-removing the condensed water of the air cooling island to a steam exhaust device pipeline; 10-removing the dead steam of the air cooling island to a condenser pipeline; 11, exhausting steam of the steam turbine to a condenser isolation valve; 12-condenser condensate pipeline; 13-a condensate water transfer pump; 14-condenser tube bundle; 15-a condenser; 16-a heat supply network circulating water supply pipeline; 17-a heat supply network circulating water supply isolation valve; 18-a heat supply network circulating water supply and return water connection valve; 19-a heat supply network circulating water supply and return water communicating pipeline; 20-a heat supply network circulating water return pipeline; 21-a heat supply network circulating water return isolation valve; 22-closed circulating water supply pipeline; 23-closed circulating water return pipeline; 24-closed circulating water return isolating valve; 25-a water storage tank; 26-closed circulating water supply isolation valve; 27-a closed cycle pump inlet isolation valve; 28-closing the cold water circulating water pump; 29-closed circulation pump outlet isolation valve; 30-closing a water pipeline of the cold water circulating water pump; 31-spraying pipe network; 32-an air inlet of the closed cooling tower; 33-axial flow fan; 34-closed cooling tower; 35-cooling coils; 36-a spray pump; 37-spraying a water storage tank.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be described in detail below. It is to be understood that the embodiments described are only some embodiments of the invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the scope protected by the present invention.
As shown in fig. 1, the steam turbine exhaust steam 2 exhausted from the steam turbine low pressure cylinder 1 enters the air cooling island 6 through the steam turbine steam exhaust device 3 for condensation, the condensed water enters the steam turbine steam exhaust device 3 through the steam turbine condensed water outlet steam exhaust device pipeline 9 of the air cooling island, and the condensed water collected by the steam turbine steam exhaust device 3 enters the condensate pipe 4 to enter the unit condensate system.
When the direct air-cooling coal-fired unit supplies heat, a heat supply network circulating water supply isolation valve 17 and a heat supply network circulating water return isolation valve 21 are opened, a heat supply network circulating water supply and return connection valve 18 is closed, after the heat supply network circulating water flows in a condensing pipe bundle 14, exhaust steam of the steam turbine is opened to a condenser isolation valve 11, the exhaust steam of the steam turbine is closed to an air cooling island isolation valve 5, the exhaust steam of the steam turbine enters a condenser 15 and exchanges heat with the heat supply network circulating water flowing in the condenser condensing pipe bundle 14 for condensation, and condensed water enters a steam turbine steam exhaust device 3 through a condensed water conveying pump 13. The heat supply network circulating water flows in the condenser tube bundle 14 and is heated to participate in heat supply.
When the unit stops supplying heat, the steam turbine exhaust steam is opened to the air cooling island isolation valve 5, the steam turbine exhaust steam is closed to the condenser isolation valve 11, the heat supply network circulating water supply and return water connection valve 18 is opened, and the heat supply network circulating water supply isolation valve 17 and the heat supply network circulating water return isolation valve 21 are closed.
And opening a closed circulating water supply isolation valve 26 and a closed circulating water return isolation valve 24, opening a closed circulating pump inlet isolation valve 27 and a closed circulating pump outlet isolation valve 29, filling water into the water storage tank 25 to a designed water level, and starting a closed cold water circulating water pump 28 to establish water circulation.
The axial flow fan 33 is started, the steam turbine exhaust steam is opened to the condenser isolating valve 11, part of the steam turbine exhaust steam enters the condenser 15 and exchanges heat with closed cooling circulating water flowing in the condenser condensation tube bundle 15, the heated closed cooling circulating water enters the cooling coil 35 in the closed cooling tower 34, air enters from the air inlet 32 of the closed cooling tower under the suction of the axial flow fan 33 and is exhausted into the atmosphere after exchanging heat with the closed cooling circulating water flowing in the cooling coil 35. When the environmental temperature is higher in summer, the closed cooling tower spray pump 36 is started, the water stored in the spray reservoir 37 at the bottom of the closed cooling tower is sprayed to the cooling coil 35 through the spray pipe network 31, and after the heat exchange between the water and the cooling coil, the water falls down and is collected to the spray reservoir 37.
Because the condenser 15 shunts part of the steam turbine exhaust steam 2 entering the air cooling island 6, the running back pressure of the direct air cooling unit is greatly reduced, and the running energy consumption of the unit is reduced.
The utility model discloses be exactly with direct air cooling coal-fired generating set high back pressure heat supply transformation and peak cooling transformation integration mutually, when the engineering is implemented, can overall consider spatial arrangement, implement in the lump, reduce and reform transform the expense to combine the current situation that current air cooling peak was reformed transform, provided new transformation technical scheme.
The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are all covered by the protection scope of the present invention.
Claims (4)
1. A high back pressure heat supply and peak cooling system of a direct air-cooling coal-fired generator set is characterized by comprising a condenser (15), a heat supply network circulating water system and a closed type cold circulating water system;
the heat supply network circulating water system comprises a heat supply network circulating water supply pipeline (16), a heat supply network circulating water supply isolation valve (17), a heat supply network circulating water return pipeline (20), a heat supply network circulating water return isolation valve (21), a heat supply network circulating water supply and return water communicating pipeline (19) and a heat supply network circulating water supply and return water communicating valve (18);
the closed type cold circulating water system comprises a closed type circulating water supply pipeline (22), a closed type circulating water return pipeline (23), a water storage tank (25), a closed cold water circulating water pump (28) and a closed type cooling tower (34), wherein the water inlet side of the water storage tank (25) is connected with the circulating water return pipeline (20) of the heat supply network, and the water outlet side of the water storage tank (25) is connected with the inlet of the closed cold water circulating water pump (28);
the upper part of a condenser (15) is connected with a steam turbine steam exhaust to air cooling island pipeline (7) through an air cooling island steam exhaust condenser pipeline (10) and a steam turbine steam exhaust to condenser isolating valve (11), and the bottom of the condenser (15) is connected with an air cooling island condensed water steam removal device pipeline (9) through a condensed water conveying pump (13) and a condenser condensed water pipeline (12);
the condenser condensation tube bundle (14) is respectively connected with a heat supply network circulating water system and a closed cold circulating water system through a heat supply network circulating water supply pipeline (16) and a heat supply network circulating water return pipeline (20);
the closed circulating water supply pipeline (22) is connected with the heat supply network circulating water supply pipeline (16) in front of the heat supply network circulating water return isolating valve (21), and the closed circulating water return pipeline (23) is connected with the heat supply network circulating water return pipeline (20) in front of the heat supply network circulating water return isolating valve (21).
2. The system of claim 1, wherein before the exhaust steam (2) of the steam turbine is discharged into the air cooling island (6) through the steam discharging device (3), a part of the steam is branched to enter the condenser (15), and the exhaust steam (2) of the steam turbine entering the condenser is cooled by a heat supply network circulating water system or a closed cooling circulating water system.
3. The system of claim 2, wherein an axial flow fan (33) is installed at the top of the closed cooling tower (34), a spraying pipe network (31) and a cooling coil (35) are arranged in the closed cooling tower (34), a spraying water storage tank (37) and a spraying pump (36) are arranged at the bottom of the closed cooling tower (34), and an air inlet (32) is formed in the tower wall of the closed cooling tower.
4. The high back pressure heat supply and peak cooling system of the direct air-cooling coal-fired power generating unit according to claim 3, characterized in that the upper end of the cooling coil (35) is connected with the condenser (15) through a closed circulating water supply pipeline (22), and the lower end of the cooling coil (35) is connected with a closed cooling water circulating water pump (28) through a closed cooling water circulating water pump water pipeline (30).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221819836.0U CN217844090U (en) | 2022-07-14 | 2022-07-14 | High back pressure heat supply and peak cooling system of direct air cooling coal-fired generator set |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202221819836.0U CN217844090U (en) | 2022-07-14 | 2022-07-14 | High back pressure heat supply and peak cooling system of direct air cooling coal-fired generator set |
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| CN217844090U true CN217844090U (en) | 2022-11-18 |
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| CN202221819836.0U Active CN217844090U (en) | 2022-07-14 | 2022-07-14 | High back pressure heat supply and peak cooling system of direct air cooling coal-fired generator set |
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2022
- 2022-07-14 CN CN202221819836.0U patent/CN217844090U/en active Active
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