CN216240824U - Condenser indirectly cools turbo generator - Google Patents

Abstract

The invention discloses a steam turbine power generation device indirectly cooled by a condenser, and aims to provide a steam turbine power generation device which is safe and stable in power generation and higher in efficiency. The system comprises a steam-water system and an indirect cold heat exchange device, wherein the steam-water system consists of a steam turbine, a condenser, a water feeding pump and a boiler, the indirect cold heat exchange device consists of a heat exchange pool, a tube bundle, a circulating water pump and a cooling water pipeline of the condenser, the heat exchange pool is arranged underground, the tube bundle is arranged at the lower part of the heat exchange pool, the tube bundle, the circulating water pump and the cooling water pipeline of the condenser are sequentially connected into a closed circulation loop through a pipeline, cooling water is arranged in the closed circulation loop, and heat transfer water is arranged in the heat exchange pool. The invention is suitable for condensing steam type thermal power plants.

Description

Condenser indirectly cools turbo generator

Technical Field

The invention relates to a steam turbine power generation system, in particular to a steam-water cooling device of the steam turbine power generation system.

Background

The existing condensing thermal power generation system is based on the Rankine cycle principle, and a power steam-water system of the existing condensing thermal power generation system comprises a boiler, a superheater, a steam turbine, a condenser, a condensate pump, a low-temperature heater and a feed pump. The working principle of the power steam-water system is as follows: on one hand, in the condenser, after the exhaust steam is cooled by cooling water, the exhaust steam is condensed into condensed water, after the condensed water leaves the condenser, the condensed water enters a low-temperature heater for preheating, and then is pressurized by a water supply pump, and finally enters the boiler to be heated into steam, so that the operation is repeated and circulated continuously; on the other hand, in the condenser, after the cooling water absorbs the heat of the exhaust steam and leaves the condenser, a large amount of heat needs to be released. In the place where the water source is abundant, the cooling water of power plant can adopt "open", namely discharge in the river after the water pump is used for cooling from the river water intaking, and in the water source area of shortage, the cooling water of power plant needs to adopt "closed" circulation, uses used cooling water repeatedly after the cooling tower cooling promptly, can practice thrift the water source like this, the pollution abatement. In a "closed" cycle, cooling water is required to release heat to the atmosphere through a cooling tower, the atmosphere being the cold end of the heat sink. In summer, the temperature is too high, the generating efficiency of the generating set is reduced due to difficult heat dissipation, and even the generating set is stopped by alarming; in winter, the temperature is too low, and the generator set has the problem of preventing the cooling water from freezing.

Disclosure of Invention

The invention aims to provide a steam turbine power generation device which is safe and stable in power generation and higher in efficiency.

In order to solve the technical problems, the invention adopts the following technical scheme: the indirect cooling steam turbine power generation device comprises a steam-water system, a steam turbine, a condenser, a water feeding pump, a boiler and an indirect cooling heat exchange device, wherein the indirect cooling heat exchange device comprises a heat exchange pool, a tube bundle, a circulating water pump and a cooling water pipeline of the condenser, the heat exchange pool is arranged underground, the tube bundle is arranged at the lower part of the heat exchange pool, the tube bundle, the circulating water pump and the cooling water pipeline of the condenser are sequentially connected into a closed circulation loop through pipelines, cooling water is arranged in the closed circulation loop, and heat transfer water is arranged in the heat exchange pool.

The invention can also: and a closed water channel circulating channel for flowing of the heat transfer water is arranged underground outside the heat exchange pool, and a water pump is arranged in the closed water channel circulating channel. The closed type ditch circulating channel can be further provided with a cold water screening pool, the cold water screening pool is arranged underground and is provided with a water inlet, a water tank, a water outlet and a water baffle, the cross sectional areas of the water inlet and the water outlet are far smaller than that of the water tank, the water baffle is arranged in front of the water outlet, and a cold water channel is arranged below the water baffle. The length of the closed water channel circulation channel and the size and the number of the cold water screening tanks can be adjusted according to actual needs. The heat exchange pool is provided with a heat transfer water inlet, a heat transfer water outlet and a water retaining wall, the cross sectional areas of the heat transfer water inlet and the heat transfer water outlet are far smaller than that of the heat exchange pool, the water retaining wall is arranged in front of the heat transfer water outlet, and a hot water channel is arranged on the water retaining wall. The condenser is characterized in that a condensate pump and a low-temperature heater are arranged between the condenser and the water feeding pump, the low-temperature heater is a heat pump, and the heat pump is composed of a compressor, an evaporator, a throttle valve and a condenser. The heat pump is divided into two connection modes, one is as follows: the outlet of the condensed water channel of the condenser, the condensed water pump, the condensed water channel of the heat pump condenser and the water feeding pump are connected in sequence, and the outlet of the heat pump evaporator, the tube bundle, the circulating water pump, the cooling water channel of the condenser and the inlet of the heat pump evaporator are connected in sequence to form a closed loop; the other is as follows: the outlet of the condensed water channel of the condenser, the condensed water pump, the condensed water channel of the heat pump condenser and the water feeding pump are sequentially connected, the outlet of the heat pump evaporator is connected with the outlet of the tube bundle and the inlet of the circulating water pump, and the inlet of the heat pump evaporator is connected with the inlet of the tube bundle and the outlet of the cooling water channel of the condenser.

Compared with the prior art, the invention has the beneficial effects that: firstly, because the heat and the cold do not exist under the earth surface, the earth is used as a cold end, the temperature of cooling water is easy to adjust, the optimal condensing temperature can be provided for a condenser, the efficiency of a steam turbine is improved, and the safety and the stability of power generation are ensured; secondly, a cooling tower is not needed, the infrastructure is simple, and the investment is low; thirdly, the heat transfer water seeps into the soil to greatly improve the heat conductivity of the soil; fourthly, after the soil is saturated with water, the lost water is less, and in addition, after the closed ditch circulation channel is covered, the evaporated water is less, so the water consumption of the system is less; cooling water and heat transfer water are independent and can be treated respectively, so that the maintenance is simple and the faults are few; the heat pump can absorb the heat in the exhaust steam, reduce the temperature of the condenser, reduce the pressure of the condenser and improve the efficiency of the steam turbine; and the condensed water is preheated by the heat absorbed by the heat pump, so that the fuel can be saved, and the pollution to the environment is reduced.

Drawings

The invention is further described below with reference to the accompanying drawings.

FIG. 1 is a schematic diagram of a steam condenser indirectly cooling a steam turbine power generation device.

Fig. 2 is a schematic longitudinal sectional view of the heat exchange tank.

Fig. 3 is a longitudinal sectional schematic view of the cold water screening tank.

Fig. 4 is a schematic diagram of a condenser indirectly cooling a steam turbine power generation device connected in series with a heat pump evaporator.

Fig. 5 is a schematic diagram of a condenser indirectly cooling a steam turbine power plant in parallel with a heat pump evaporator.

In the figure: a water inlet; 1, a water tank 2; the earth 3; a cold water passage 4; a water baffle 5; a water outlet 6; a cover plate 7; a water collector 8; a tube bundle 9; a water separator 10; a heat transfer water inlet 11; a heat transfer water outlet 12; and a water retaining wall 13.

Detailed Description

In fig. 1, 2 and 3, a condenser indirectly-cooled steam turbine power generation device is composed of a steam turbine, a generator, a condenser, a feed pump, a boiler, a superheater, a circulating water pump, a heat exchange pool, a water separator 10, a tube bundle 9, a water collector 8, a water pump and a cold water screening pool. The outlet of a condensed water channel of the condenser, a feed pump, a boiler, a superheater, a steam turbine and an exhaust steam inlet of the condenser are connected in sequence. According to the power of the generator set, a plurality of groups of adaptive tube bundles 9 with water distributors 10 and water collectors 8 are selected, and after the tube bundles are connected in series and in parallel, the tube bundles and cooling water channels of a circulating water pump and a condenser form a closed cooling water circulation loop in sequence, and tap water is used as cooling water and is arranged in the closed cooling water circulation loop. According to the actual demand of exchanging heat with the ground, a plurality of adaptive cold water screening tanks are arranged, are connected in series and in parallel and then form a closed heat transfer water circulation loop with a water pump and a heat exchange tank through a water channel circulation channel. The cold water screening pool is arranged underground and is provided with a water inlet 1, a water tank 2, a cold water channel 4, a water baffle 5, a water outlet 6 and a cover plate 7, wherein the cross sectional areas of the water inlet 1 and the water outlet 6 are far smaller than the cross sectional area of the water tank 2. The heat exchange pool is also arranged underground and is provided with a heat transfer water inlet 11, a heat transfer water outlet 12 and a water retaining wall 13, and a hot water channel is arranged above the water retaining wall 13. The tube bundle 9 is arranged in the lower part of the heat exchange tank. The heat transfer water is reclaimed water.

In this device, heat transfer water can permeate to the surrounding soil through heat exchange pond and cold water screening pond and ditch circulation channel, and after the moisture saturation that absorbs in soil, soil just no longer absorbed moisture, in addition, apron 7 can prevent the evaporation of water, and consequently the moisture loss of this device is few. The water occupies the air in the soil, so that the heat conductivity of the soil can be greatly improved. Because the cross-sectional area of the inlet and the outlet of the cold water screening pool is far smaller than that of the water tank 2, the flow velocity of water in the water tank 2 is very slow, laminar flow can be naturally formed, low-temperature heat transfer water below can flow out from the lower part of the cold water screening pool through the cold water channel 4 from the water outlet 6, and high-temperature heat transfer water is intercepted to exchange heat with the ground. Similarly, in the heat exchange tank, after the low-temperature heat transfer water at the bottom absorbs the heat of the tube bundle 9, the temperature rises, the density is reduced, the water naturally floats, then the water reaches the heat transfer water outlet 12 through the upper part of the water retaining wall 13, and the water is pumped by the water pump to enter the cold water screening tank again for heat dissipation, and the process is repeated.

In order to further improve the power generation efficiency and save fuel, a condensate pump and a low-temperature heater can be arranged between the condenser and the water supply pump, the low-temperature heater is a heat pump, and the heat pump consists of a compressor, an evaporator, a throttle valve and a condenser. The outlet of the condensed water channel of the condenser, the condensed water pump, the condensed water channel of the heat pump condenser and the water feeding pump are connected in sequence. As shown in fig. 4, the heat pump evaporator channels may be connected in series into the cooling water circulation loop, namely: the outlet of the heat pump evaporator, the tube bundle, the circulating water pump, the cooling water channel of the condenser and the inlet of the heat pump evaporator are sequentially connected to form a closed loop. As shown in fig. 5, the heat pump evaporator channels may also be connected in parallel to a cooling water circulation loop, that is: the outlet of the heat pump evaporator is connected with the outlet of the tube bundle and the inlet of the circulating water pump, and the inlet of the heat pump evaporator is connected with the inlet of the tube bundle and the outlet of the cooling water channel of the condenser.

After the heat pump is connected, the evaporator of the heat pump can absorb the heat of the exhaust steam in the condenser through the cooling water, the temperature of the exhaust steam is reduced, the pressure of the condenser is reduced, the efficiency of the steam turbine is improved, meanwhile, the heat absorbed by the evaporator of the heat pump can also be used for generating power by preheating condensed water through the heat pump condenser, the consumption of fuel is reduced, and in addition, the ground thermal pollution can also be reduced.

Claims (6)

1. The utility model provides a condenser indirectly cools turbo power generation facility, includes that the steam-water system comprises steam turbine, condenser, feed pump, boiler, characterized by: the indirect cooling heat exchange device is characterized by further comprising an indirect cooling heat exchange device, wherein the indirect cooling heat exchange device is composed of a heat exchange pool, a tube bundle, a circulating water pump and a cooling water pipeline of a condenser, the heat exchange pool is arranged underground, the tube bundle is arranged on the lower portion of the heat exchange pool, the tube bundle, the circulating water pump and the cooling water pipeline of the condenser are sequentially connected into a closed circulation loop through pipelines, cooling water is arranged in the closed circulation loop, and heat transfer water is arranged in the heat exchange pool.

2. The condenser indirectly cooling the steam turbine power generation device according to claim 1, wherein: and a closed water channel circulating channel for flowing of the heat transfer water is arranged underground outside the heat exchange pool, and a water pump is arranged in the closed water channel circulating channel.

3. The condenser indirectly cooling the turbine power generation device according to claim 2, wherein: the closed type ditch circulating channel is characterized in that a cold water screening pool is further arranged in the closed type ditch circulating channel, the cold water screening pool is arranged underground and is provided with a water inlet, a water tank, a water outlet and a water baffle, the cross sectional areas of the water inlet and the water outlet are far smaller than the cross sectional area of the water tank, the water baffle is arranged in front of the water outlet, and a cold water channel is arranged below the water baffle.

4. The condenser indirectly cooling the turbine power generation device according to claim 3, wherein: the heat exchange pool is provided with a heat transfer water inlet, a heat transfer water outlet and a water retaining wall, the cross sectional areas of the heat transfer water inlet and the heat transfer water outlet are far smaller than that of the heat exchange pool, the water retaining wall is arranged in front of the heat transfer water outlet, and a hot water channel is arranged on the water retaining wall.

5. The condenser indirectly cooling the turbine power generation device according to claim 4, wherein: the condenser is characterized in that a condensate pump and a low-temperature heater are arranged between the condenser and the water supply pump, the low-temperature heater is a heat pump, the heat pump is composed of a compressor, an evaporator, a throttle valve and a condenser, a condensate passage outlet of the condenser, the condensate pump, a condensate passage of the heat pump condenser and the water supply pump are sequentially connected, and a heat pump evaporator outlet, the tube bundle, the circulating water pump, a condenser cooling water passage and a heat pump evaporator inlet are sequentially connected into a closed loop.

6. The condenser indirectly cooling the turbine power generation device according to claim 4, wherein: be provided with condensate pump and low temperature heating ware between condenser and the water-feeding pump, low temperature heating ware is the heat pump, the heat pump comprises compressor, evaporimeter, choke valve and condenser, condenser condensate passage export condensate pump the condensate passage of heat pump condenser the water-feeding pump connects gradually, the export of heat pump evaporimeter with the tube bank export and the circulating water pump import is connected, the import of heat pump evaporimeter with the tube bank import and the export of condenser cooling water passage is connected.

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