阅读说明：本技术 一种带能量回收功能的开式循环系统 (Open type circulating system with energy recovery function ) 是由 张知翔 马聪永 张广才 朱仓海 李赞 毕华南 张永利 杨杰 袁运海 田志斌 王爱 于 2020-05-12 设计创作，主要内容包括：本发明公开了一种带能量回收功能的开式循环系统,包括冷却塔、驱动系统、烟气冷凝器、水轮机、异步发电机及电源柜；冷却塔的出口经驱动系统与烟气冷凝器的入口相连通,烟气冷凝器的出口与水轮机的入口相连通,水轮机的出口与冷却塔的入口相连通,水轮机与异步发电机的驱动轴相连接,异步发电机的输出端与电源柜相连接,其中,烟气冷凝器的高度高于冷却塔底部水池的高度及水轮机的高度,该系统能够实现工质水能量的回收利用,降低系统能耗,提高系统运行的稳定性及经济性。(The invention discloses an open cycle system with an energy recovery function, which comprises a cooling tower, a driving system, a flue gas condenser, a water turbine, an asynchronous generator and a power supply cabinet, wherein the cooling tower is arranged on the upper part of the cooling tower; the outlet of the cooling tower is communicated with the inlet of the flue gas condenser through a driving system, the outlet of the flue gas condenser is communicated with the inlet of the water turbine, the outlet of the water turbine is communicated with the inlet of the cooling tower, the water turbine is connected with the driving shaft of the asynchronous generator, and the output end of the asynchronous generator is connected with the power supply cabinet, wherein the height of the flue gas condenser is higher than the height of a water pool at the bottom of the cooling tower and the height of the water turbine, the system can realize the recycling of working medium water energy, the energy consumption of the system is reduced, and the stability and the economy.)

1. An open cycle system with an energy recovery function is characterized by comprising a cooling tower (1), a driving system, a flue gas condenser (6), a water turbine (8), an asynchronous generator (12) and a power supply cabinet (13);

the outlet of the cooling tower (1) is communicated with the inlet of the flue gas condenser (6) through a driving system, the outlet of the flue gas condenser (6) is communicated with the inlet of the water turbine (8), the outlet of the water turbine (8) is communicated with the inlet of the cooling tower (1), the water turbine (8) is connected with the driving shaft of the asynchronous generator (12), the output end of the asynchronous generator (12) is connected with a power supply cabinet (13), and the height of the flue gas condenser (6) is higher than the height of a water pool at the bottom of the cooling tower (1) and the height of the water turbine (8).

2. The open-type circulation system with the energy recovery function according to claim 1, wherein the driving system comprises a plurality of branches which are communicated in parallel, and a circulation pump inlet manual valve (2), a circulation pump (3), a check valve (4) and a circulation pump outlet electric valve (5) are sequentially arranged on each branch along the water flow direction.

3. The open cycle system with energy recovery function according to claim 1, characterized in that a turbine inlet manual valve (7) is provided at the inlet of the turbine (8), and a turbine outlet manual valve (9) is provided at the outlet of the turbine (8).

4. The open circulation system with the energy recovery function according to claim 1, comprising a bypass pipeline, wherein one end of the bypass pipeline is communicated with the outlet of the flue gas condenser (6), the other end of the bypass pipeline is communicated with the inlet of the cooling tower (1), and the bypass pipeline is provided with a throttle orifice (10) and an electric regulating valve (11).

5. Open cycle system with energy recovery according to claim 1, characterized in that the hydraulic turbine (8) is connected to the asynchronous generator (12) via a shaft.

6. The open cycle system with energy recovery function according to claim 1, wherein the asynchronous generator (12) is connected to the power supply cabinet (13) by a wire.

7. Open cycle system with energy recovery according to claim 1, characterized in that the gating power W of the water turbine (8)₁＝1127Q(H-P+A)/η₁Q is circulating water flow, H is the difference value between the elevation of the outlet of the flue gas condenser (6) and the elevation of the water pool of the cooling tower (1), P is the sum of the on-way resistance and the local resistance between the outlet of the flue gas condenser (6) and the water pool of the cooling tower (1) expressed by a water column, A is the selection allowance of the lift of the circulating pump (3), η₁The efficiency of the water turbine (8).

8. Open cycle system with energy recovery according to claim 7, characterized in that the asynchronous generator (12) has a type-selected power W₂＝1127Q(H-P+A)/η₂Wherein, η₂Is the efficiency of the asynchronous generator (12).

9. Open cycle system with energy recovery according to claim 7, characterized in that the orifice plate (10) is an n-stage orifice plate, wherein,

when H-P + A is less than or equal to 15, n is 1;

when H-P + A is more than 15 and less than or equal to 30, n is 2;

when H-P + a > 30, n is 3.

10. The open cycle system with energy recovery according to claim 7, wherein the orifice plate (10) has a total orifice resistance k ═ 8613(H-P + A).

Technical Field

The invention belongs to the technical field of coal-fired boilers, and relates to an open circulation system with an energy recovery function.

Background

SO in tail flue gas of coal-fired boiler₂More than 90% of the treatment is carried out by adopting a wet desulphurization system, so that wet flue gas at the inlet of the chimney contains a small amount of fog drops, the fog drops have the same components as desulphurization slurry, and the emission of pollutants can be increased when the fog drops drift to the atmosphere along with the flue gas. A flue gas condenser is additionally arranged at the outlet of the desulfurizing tower, and cooling water is utilized to desulfurizeThe saturated wet flue gas at the outlet of the tower is reduced by about 5 ℃, a large amount of condensed water is separated out, pollutants in the flue gas can be captured in the condensed water, and the emission of the pollutants can be reduced. Due to the condensation process, the heat of condensation of the water vapor is very large, and therefore the amount of cooling water required is also large. The central elevation of an outlet flue of a general desulfurizing tower is about 50 meters, the elevation of a cooling water source is 0 meter, the allowance of the on-way loss and the local resistance loss of a pipeline is 15 meters of water column and 5 meters of water column, the lift of a cooling water pump is about 70 meters, the power of the cooling water pump is very high, and the energy consumption of a system is very high. After the cooling water comes out of the flue gas condenser, the lift required for returning the cooling water to a cooling water source is 15 meters, but the height difference is 50 meters, so that energy of 35 meters of water columns is wasted in a throttling mode, and a large amount of energy loss is caused.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides an open type circulating system with an energy recovery function, which can realize the recovery and utilization of the energy of working medium water, reduce the energy consumption of the system and improve the stability and the economical efficiency of the operation of the system.

In order to achieve the purpose, the open cycle system with the energy recovery function comprises a cooling tower, a driving system, a flue gas condenser, a water turbine, an asynchronous generator and a power supply cabinet;

the outlet of the cooling tower is communicated with the inlet of the flue gas condenser through a driving system, the outlet of the flue gas condenser is communicated with the inlet of the water turbine, the outlet of the water turbine is communicated with the inlet of the cooling tower, the water turbine is connected with a driving shaft of the asynchronous generator, the output end of the asynchronous generator is connected with the power supply cabinet, and the height of the flue gas condenser is higher than the height of a water pool at the bottom of the cooling tower and the height of the water turbine.

The driving system comprises a plurality of branches which are communicated in parallel, wherein a circulating pump inlet manual valve, a circulating pump, a check valve and a circulating pump outlet electric valve are sequentially arranged on each branch along the water flow direction.

The inlet of the water turbine is provided with a manual valve of the inlet of the water turbine, and the outlet of the water turbine is provided with a manual valve of the outlet of the water turbine.

The cooling tower is characterized by further comprising a bypass pipeline, wherein one end of the bypass pipeline is communicated with an outlet of the flue gas condenser, the other end of the bypass pipeline is communicated with an inlet of the cooling tower, and a throttling orifice plate and an electric regulating valve are arranged on the bypass pipeline.

The water turbine is connected with the asynchronous generator through a shaft.

The asynchronous generator is connected with the power supply cabinet through a wire.

Type selection power W of water turbine₁＝1127Q(H-P+A)/η₁Q is circulating water flow, H is the difference value between the elevation of the outlet of the flue gas condenser and the elevation of the water pool of the cooling tower, P is the sum of on-way resistance and local resistance between the outlet of the flue gas condenser and the water pool of the cooling tower represented by a water column, A is the model selection allowance of the lift of the circulating pump, η₁The efficiency of the water turbine.

Model selection power W of asynchronous generator₂＝1127Q(H-P+A)/η₂Wherein, η₂Is the efficiency of the asynchronous generator.

The throttle orifice plate is an n-stage throttle orifice plate, wherein,

when H-P + A is less than or equal to 15, n is 1;

when H-P + A is more than 15 and less than or equal to 30, n is 2;

when H-P + a > 30, n is 3.

The total throttle resistance k of the throttle disk is 8613(H-P + a).

The invention has the following beneficial effects:

when the open circulation system with the energy recovery function is in specific operation, cooling water is boosted through the driving system and enters the flue gas condenser by overcoming the height difference and the piping resistance, the potential energy of the cooling water output by the flue gas condenser is very large, the redundant potential energy is converted into the kinetic energy of the cooling water besides the piping resistance of a return stroke, a water turbine is added on the return stroke piping, the kinetic energy of the cooling water is utilized to push the water turbine to do work, the potential energy is converted into electric energy through the asynchronous generator, and finally the electric energy is transmitted into the power cabinet for load use, so that the total energy consumption of the system is reduced. In addition, the asynchronous generator changes the water turbine to do work, so that the water flow of the whole system is adjusted, the outlet smoke temperature of the smoke condenser is accurately controlled, and the stability and the economical efficiency of the system operation are effectively improved.

Furthermore, the bypass pipeline is arranged, when the water turbine, the asynchronous generator or the power cabinet breaks down, redundant energy of the whole system still needs to be consumed, due to the fact that the energy is too large, the valve core is abraded violently when the energy is consumed by the electric regulating valve, the throttle orifice plate is arranged on the bypass pipeline, about 85% of energy is consumed by the throttle orifice plate, the rest energy is consumed by the electric regulating valve, and water flow of the system is regulated through the electric regulating valve.

Drawings

FIG. 1 is a schematic diagram of the present invention.

Wherein, 1 is a cooling tower, 2 is a manual valve of a circulating pump inlet, 3 is a circulating pump, 4 is a check valve, 5 is an electrically operated valve of a circulating pump outlet, 6 is a flue gas condenser, 7 is a manual valve of a water turbine inlet, 8 is a water turbine, 9 is a manual valve of a water turbine outlet, 10 is a throttle orifice plate 10, 11 is an electrically operated regulating valve, 12 is an asynchronous generator, and 13 is a power cabinet.

Detailed Description

The invention is described in further detail below with reference to the accompanying drawings:

referring to fig. 1, the open cycle system with energy recovery function according to the present invention includes a cooling tower 1, a driving system, a flue gas condenser 6, a water turbine 8, an asynchronous generator 12, and a power cabinet 13; the outlet of the cooling tower 1 is communicated with the inlet of the flue gas condenser 6 through a driving system, the outlet of the flue gas condenser 6 is communicated with the inlet of the water turbine 8, the outlet of the water turbine 8 is communicated with the inlet of the cooling tower 1, the water turbine 8 is connected with the driving shaft of the asynchronous generator 12, the output end of the asynchronous generator 12 is connected with the power supply cabinet 13, and the height of the flue gas condenser 6 is higher than the height of the water pool at the bottom of the cooling tower 1 and the height of the water turbine 8.

The driving system comprises a plurality of branches which are communicated in parallel, wherein a circulating pump inlet manual valve 2, a circulating pump 3, a check valve 4 and a circulating pump outlet electric valve 5 are sequentially arranged on each branch along the water flow direction; the inlet of the water turbine 8 is provided with a water turbine inlet manual valve 7, and the outlet of the water turbine 8 is provided with a water turbine outlet manual valve 9.

The invention also comprises a bypass pipeline, wherein one end of the bypass pipeline is communicated with the outlet of the flue gas condenser 6, the other end of the bypass pipeline is communicated with the inlet of the cooling tower 1, and the bypass pipeline is provided with a throttle orifice plate 10 and an electric regulating valve 11; the water turbine 8 is connected with the asynchronous generator 12 through a shaft; the asynchronous generator 12 is connected with the power supply cabinet 13 through a wire.

Type selection power W of water turbine 8₁＝1127Q(H-P+A)/η₁Q is circulating water flow, H is the difference value between the elevation of the outlet of the flue gas condenser 6 and the elevation of the water pool of the cooling tower 1, P is the sum of on-way resistance and local resistance between the outlet of the flue gas condenser 6 and the water pool of the cooling tower 1 represented by a water column, A is the selection allowance of the lift of the circulating pump 3, η₁The efficiency of the turbine 8.

Model selection power W of asynchronous generator 12₂＝1127Q(H-P+A)/η₂Wherein, η₂Is the efficiency of the asynchronous generator 12.

The orifice plate 10 is an n-stage orifice plate, wherein,

when H-P + A is less than or equal to 15, n is 1;

when H-P + A is more than 15 and less than or equal to 30, n is 2;

when H-P + a > 30, n is 3.

The total throttle resistance k of the throttle disk 10 is 8613(H-P + a).

The specific working process of the invention is as follows:

after the cooling water is boosted by the circulating pump 3, the cooling water enters the flue gas condenser 6 by overcoming the height difference and the piping resistance, the potential energy of the cooling water output by the flue gas condenser 6 is very large, the piping resistance of a return stroke is overcome, the redundant potential energy is converted into the kinetic energy of the cooling water, the water turbine 8 is added on the return stroke piping, the kinetic energy of the cooling water is used for pushing the water turbine 8 to do work, the potential energy is converted into electric energy by the asynchronous generator 12, and finally the electric energy is transmitted to the power cabinet 13 for load use, so that the total energy consumption of the system is reduced. The water turbine 8 is changed to do work through the asynchronous generator 12, the water flow of the whole system is adjusted, the outlet smoke temperature of the smoke condenser 6 is accurately controlled, meanwhile, the bypass pipeline is arranged, when the water turbine 8, the asynchronous generator 12 or the power cabinet 13 breaks down, redundant energy of the whole system still needs to be consumed, and due to the fact that the energy is too large, valve core abrasion is severe when the energy is consumed by the electric adjusting valve 11, the throttle orifice plate 10 is additionally arranged, about 85% of energy is consumed by the throttle orifice plate 10, the rest of energy is consumed by the electric adjusting valve 11, and the water flow of the system is adjusted through the electric adjusting valve 11.