A system for reducing the moisture content of heating steam by flash evaporation

Abstract

The present invention discloses a system for reducing the water content of heating steam by flash evaporation, comprising a cogeneration unit, a steam supply main pipeline, a steam supply branch pipeline and a flash evaporation device; the outlet of the cogeneration unit is connected to the steam supply main pipeline, the steam supply main pipeline is provided with a branch port, the branch port is connected to the steam supply branch pipeline inlet, the steam supply branch pipeline outlet is connected to the steam inlet of the flash evaporation device, and the steam outlet of the flash evaporation device is connected to the user. By passing high-pressure saturated steam with water into the flash evaporation device, flash evaporation is performed to supply steam with a lower pressure that meets the pressure requirements of the user, thereby reducing the water content of the steam, increasing the steam heat supply, and achieving energy saving and consumption reduction.

Description

Technical Field

[0001] The invention belongs to the field of steam utilization of coal-fired units and relates to a system for reducing the water content of heating steam by flash evaporation. Background Art

[0002] Cogeneration of heat and power by coal-fired units is the most energy-efficient heating method. Supplying steam to industrial parks through steam heating pipelines from coal-fired units can effectively improve energy efficiency and reduce pollutant emissions. However, in actual applications, steam-using enterprises have inconsistent requirements for steam parameters. Some end users of steam pipe networks do not have high requirements for steam pressure, but the steam pressure supplied by the steam pipe network is relatively high, which does not meet the steam pressure requirements of some end users of steam pipe networks. Summary of the invention

[0003] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art and provide a system for reducing the moisture content of heating steam by flash evaporation, flashing out steam with a lower pressure that meets the user's pressure requirements for supply, thereby reducing steam carrying water, increasing steam heating capacity, and achieving energy saving and consumption reduction.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions:

[0005] A system for reducing the moisture content of heating steam by flash evaporation, comprising a cogeneration unit, a steam supply main pipeline, a steam supply branch pipeline and a flash evaporation device;

[0006] The outlet of the cogeneration unit is connected to the steam supply main pipeline, and a branch port is arranged on the steam supply main pipeline, the branch port is connected to the inlet of the steam supply branch pipeline, the outlet of the steam supply branch pipeline is connected to the steam inlet of the flash evaporation device, and the steam outlet of the flash evaporation device is connected to the user.

[0007] Preferably, a flow regulating valve is provided on the steam supply branch pipeline.

[0008] Preferably, the flash evaporation equipment includes a flash tank, which is provided with a vacuum pipe, a steam inlet, a steam outlet and a water outlet; the water outlet is located at the bottom of the flash tank, the steam outlet is located in the middle of the flash tank, the steam outlet is located at the top of the flash tank, the vacuum pipe is connected to the inside of the flash tank, and the vacuum pipe is connected to a vacuum pump.

[0009] Preferably, the water outlet is connected to the cooling water inlet of a cooling tower.

[0010] Furthermore, a condenser is arranged between the water outlet and the cooling water inlet of the cooling tower, the water outlet is connected to the hot end inlet of the condenser, the hot end outlet of the condenser is connected to the cooling water inlet of the cooling tower, the cold end inlet of the condenser is connected to the cooling water outlet of the cooling tower, and the cold end outlet of the condenser is connected to the cooling water inlet of the cooling tower.

[0011] Preferably, the water outlet is connected to a domestic hot water pipeline.

[0012] Preferably, a steam turbine is provided between the steam outlet of the flash evaporation equipment and the user.

[0013] Preferably, a plurality of branch ports are provided on the steam supply main pipeline, each branch port is connected to a steam supply branch pipeline, and each steam supply branch pipeline is connected to a flash evaporation device.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] The present invention reduces the water content of steam, increases the heat supply of steam, and achieves energy conservation and consumption reduction by passing high-pressure saturated steam with water into a flash evaporation device to flash out steam with a lower pressure that meets the pressure requirements of users for supply.

[0016] Furthermore, the flow regulating valve installed on the steam supply branch pipeline can adjust different inlet and outlet pressures according to the different pressure requirements of users and the user's position in the steam pipeline network, and can be adjusted according to changes in the supply steam pressure and water content.

[0017] Furthermore, the flash evaporated water is used as makeup water for the cooling tower, which can reduce the water consumption of the cooling tower.

[0018] Furthermore, the condenser is condensed by the circulating water from the cooling tower, and the condensed water enters the cooling tower, thereby realizing the reuse of the circulating water of the cooling tower.

[0019] Furthermore, the water after flash evaporation is passed into the domestic hot water pipeline and can be used as domestic hot water for users, thereby achieving effective utilization of water resources and achieving energy conservation and consumption reduction. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the system structure of the present invention.

[0021] Among them: 1-cogeneration unit; 2-steam supply main pipeline; 3-steam supply branch pipeline; 4-flash equipment. DETAILED DESCRIPTION

[0022] The present invention is further described in detail below in conjunction with the accompanying drawings:

[0023] like Figure 1 As shown, the system for reducing the moisture content of heating steam by flash evaporation according to the present invention comprises a cogeneration unit 1, a steam supply main pipeline 2, a steam supply branch pipeline 3 and a flash evaporation device 4 connected in sequence.

[0024] The steam outlet of the cogeneration unit 1 is connected to the inlet of the steam supply main pipeline 2. The steam supply main pipeline 2 is provided with multiple branch ports, each of which is connected to the inlet of a steam supply branch pipeline 3, and each outlet of the steam supply branch pipeline 3 is connected to the steam inlet of a flash evaporation device 4. The steam outlet of the flash evaporation device 4 is connected to the user.

[0025] A flow regulating valve is provided on the steam supply branch pipe 3. Different inlet and outlet pressures can be adjusted according to different pressure requirements of users and the location of users in the steam pipe network, and can be adjusted according to changes in the supply steam pressure and water content.

[0026] The flash evaporation device 4 includes a flash tank, which is provided with a vacuum pipe, a steam inlet, a steam outlet and a water outlet; the water outlet is located at the bottom of the flash tank, and is used to discharge the water after flash evaporation from the flash tank; the steam outlet is located in the middle of the flash tank, and the steam outlet is located at the top of the flash tank. The vacuum pipe is connected to the inside of the flash tank, and the vacuum pipe is connected to a vacuum pump. The vacuum pump is used to evacuate the flash tank to ensure that the steam can flash when it enters the flash tank.

[0027] A steam turbine is arranged between the steam outlet of the flash evaporation device 4 and the user, and the steam is transported to the user through the steam turbine.

[0028] This embodiment reuses the water discharged from the water outlet, and provides two utilization methods.

[0029] The first type is that the water outlet is connected to the cooling water inlet of the cooling tower, and the water discharged from the water outlet is used as the replenishment water of the cooling tower, which can reduce the water consumption of the cooling tower.

[0030] A condenser is arranged between the water outlet and the cooling water inlet of the cooling tower, the water outlet is connected to the hot end inlet of the condenser, the hot end outlet of the condenser is connected to the cooling water inlet of the cooling tower, the cold end inlet of the condenser is connected to the cooling water outlet of the cooling tower, and the cold end outlet of the condenser is connected to the cooling water inlet of the cooling tower. The circulating water from the cooling tower is condensed in the condenser, and the condensed water enters the cooling tower, realizing the reuse of the circulating water of the cooling tower.

[0031] The second method is to connect the water outlet to the domestic hot water pipe, and pass the flash evaporated water into the domestic hot water pipe, which can be used as domestic hot water for users, realizing the effective utilization of water resources, saving the energy consumption required for heating water, and achieving energy saving and consumption reduction.

[0032] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A system for reducing the moisture content of heating steam by flash evaporation, characterized in that: It includes a combined heat and power unit (1), a steam supply main pipeline (2), a steam supply branch pipeline (3) and a flash steam device (4); The outlet of the cogeneration unit (1) is connected to a steam supply main pipeline (2), a branch port is provided on the steam supply main pipeline (2), the branch port is connected to an inlet of a steam supply branch pipeline (3), the outlet of the steam supply branch pipeline (3) is connected to a steam inlet of a flash evaporation device (4), and the steam outlet of the flash evaporation device (4) is connected to a user; The flash evaporation device (4) comprises a flash tank, on which a vacuum pipe, a steam inlet, a steam outlet and a water outlet are arranged; the water outlet is located at the bottom of the flash tank, the steam outlet is located in the middle of the flash tank, the steam outlet is located at the top of the flash tank, the vacuum pipe is connected to the inside of the flash tank, and the vacuum pipe is connected to a vacuum pump; The water outlet is connected to a cooling water inlet of a cooling tower; A condenser is arranged between the water outlet and the cooling water inlet of the cooling tower, the water outlet is connected to the hot end inlet of the condenser, the hot end outlet of the condenser is connected to the cooling water inlet of the cooling tower, the cold end inlet of the condenser is connected to the cooling water outlet of the cooling tower, and the cold end outlet of the condenser is connected to the cooling water inlet of the cooling tower; A steam turbine is provided between the steam outlet of the flash evaporation device (4) and the user.

2. The system for reducing the moisture content of heating steam by flash evaporation according to claim 1, characterized in that: A flow regulating valve is provided on the steam supply branch pipe (3).

3. The system for reducing the moisture content of heating steam by flash evaporation according to claim 1, characterized in that: A plurality of branch ports are arranged on the steam supply main pipeline (2), each branch port is connected to a steam supply branch pipeline (3), and each steam supply branch pipeline (3) is connected to a flash evaporation device (4).

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