阅读说明：本技术 用于脱硫废水零排放系统的蒸汽湿式自冷凝装置及方法 (steam wet type self-condensation device and method for desulfurization wastewater zero-discharge system ) 是由 缪明烽 于 2019-09-29 设计创作，主要内容包括：本发明公开了用于脱硫废水零排放系统的蒸汽湿式自冷凝装置及方法。多效闪蒸分离设备而来的尾部负压蒸汽进入湿式空冷器的管程进行冷却,湿式空冷器采用自循环的喷淋水和凝结水泵排出的凝结水对换热管进行冷却；并采用机械强制通风进行换热,凝结水由湿式空冷器出口排出,向下流入到凝结水箱中；当凝结水箱内的凝结水收集到一定液位时,由凝结水排出泵可作为补充水排出至湿式空冷器用于换热,也可一部分排出至各用水点；真空泵将凝结水箱内的空气及未完全冷凝的水汽排出,维持凝结水箱内负压工况,进而也为湿式空冷器和多效闪蒸分离系统提供了负压工况。本发明具有无需外部引入循环冷却水,可在不同环境温度下,低能耗稳定运行的效果。(The invention discloses a steam wet-type self-condensation device and a steam wet-type self-condensation method for a desulfurization wastewater zero-discharge system. The tail negative pressure steam from the multi-effect flash separation equipment enters a tube pass of a wet air cooler for cooling, and the wet air cooler cools a heat exchange tube by adopting self-circulating spray water and condensed water discharged by a condensed water pump; mechanical forced ventilation is adopted for heat exchange, and condensed water is discharged from an outlet of the wet air cooler and flows downwards into a condensed water tank; when the condensed water in the condensed water tank is collected to a certain liquid level, the condensed water can be discharged to the wet air cooler for heat exchange as the make-up water by the condensed water discharge pump, and part of the condensed water can also be discharged to each water using point; the vacuum pump discharges the air in the condensate tank and the incompletely condensed water vapor, and the negative pressure working condition in the condensate tank is maintained, so that the negative pressure working condition is provided for the wet air cooler and the multi-effect flash evaporation separation system. The invention has the effects of low energy consumption and stable operation at different environmental temperatures without introducing circulating cooling water from the outside.)

1. A wet-type self-condensing equipment of steam for desulfurization waste water zero discharge system, characterized in that, including wet-type air cooler (1), condensate tank (2), vacuum pump (3), condensate discharge pump (4) and condensate point export (5) with water, including spray layer (11), circulating pump (13) and the pump cooling water with water point (14) of system's pump cooling water at the top in wet-type air cooler (1), basin (12) of lower part, wet-type air cooler (1) sets up in condensate tank (2) upstream, the position that wet-type air cooler (1) set up is higher than the position of condensate tank (2), condensate tank (2) set up in vacuum pump (3) and condensate discharge pump (4) upstream, the low reaches of condensate discharge pump with wet-type air cooler (1) is connected, the point export (5) with water is located the low reaches, the system is characterized in that a condensed water point outlet (5) is connected with each water point (7), an outlet of a circulating pump (13) is connected with a pump cooling water point (14) in the system and a spraying layer (11), the pump cooling water point (14) in the system is backwardly connected with a water tank (12), and a tube pass from a wet air cooler (1) to a condensed water tank (2) and a tube pass from the condensed water tank (2) to a suction inlet of a vacuum pump (3) are a closed communication system.

2. The steam wet self-condensing device for desulfurization waste water zero discharge system according to claim 1, further comprising a reuse water discharge pump (6), wherein the reuse water discharge pump (6) is connected to the bottom water tank (12) of the wet air cooler (1), and the reuse water discharge pump (6) discharges the condensed water in the steam condensing device to each water use point (7).

3. the steam wet self-condensing device for desulfurization wastewater zero discharge system according to claim 2, characterized in that the condensate discharge pump (4) is provided downstream of the condensate tank (2), and the condensate discharge pump (4) is connected to the top spray layer (11) of the wet air cooler (1).

4. The steam wet self-condensing device for desulfurization waste water zero discharge system according to claim 2, characterized in that the condensed water discharge pump (4) is provided downstream of the condensed water tank (2), and the condensed water discharge pump (4) is connected to the bottom water tank (12) of the wet air cooler (1).

5. The steam wet self-condensation device for desulfurization wastewater zero discharge system according to claim 1, wherein the condensed water discharge pump (4) connects the water usage points (7) and the wet air cooler (1) at the same time.

6. The steam wet self-condensing device for desulfurization waste water zero discharge system according to claim 1, characterized in that the wet air cooler (1) is provided with the ventilation openings (8) oppositely arranged.

7. the steam wet self-condensation device for desulfurization waste water zero discharge system according to claim 1, characterized in that said vacuum pump (3) is connected to the top of said condensation water tank (2).

8. The steam wet-type self-condensation method for the desulfurization wastewater zero-discharge system is characterized in that the steam wet-type self-condensation device for the desulfurization wastewater zero-discharge system is applied according to the claims 1-7,

Tail negative pressure steam (9) from the multi-effect flash separation equipment enters a tube pass of the wet air cooler (1), exchanges heat with spray water of a spray layer (11) in the wet air cooler (1), and is gradually condensed into condensed water;

After the heat exchange between the spray water in the wet air cooler (1) and the air, most of the spray water is cooled and flows back to a water tank (12) at the bottom of the equipment, and a small part of the spray water is vaporized and volatilized and is discharged along with the air;

The circulating power of the spray water in the wet air cooler (1) is provided by a circulating water pump in the equipment;

the condensed water is discharged from an outlet of the wet air cooler (1) and flows downwards into a condensed water tank (2) under the action of gravity and vacuum negative pressure;

When the condensed water in the condensed water tank (2) is collected to a certain liquid level, the condensed water is discharged to the wet air cooler (1) by the condensed water discharge pump (4), and part of the water can be directly discharged to the spraying layer (11) at the top of the wet air cooler (1) and is directly used as spraying water to exchange heat with steam; or can be discharged into a water tank (12) at the bottom of the wet air cooler (1);

The water discharged by the condensed water discharge pump (4) may be discharged to the wet air cooler (1) entirely, or a part of the water may be discharged to each water consumption point (7), and a part of the water may be discharged to the wet air cooler (1) as makeup water;

the suction inlet of the vacuum pump (3) is connected out from the top of the condensate tank (2), air in the condensate tank (2) and incompletely condensed water vapor are discharged, the negative pressure working condition in the condensate tank (2) is maintained, and then the negative pressure working condition is provided for the wet air cooler (1) and the multi-effect flash separation system.

Technical Field

the invention relates to the technical field of desulfurization wastewater treatment, in particular to a steam wet-type self-condensation device and method for a desulfurization wastewater zero-discharge system.

Background

in the flue gas desulfurization process of a thermal power plant, a limestone-gypsum wet desulfurization system is usually adopted, and in order to maintain the chloride ion balance in the desulfurization system, desulfurization wastewater needs to be discharged from the desulfurization system regularly. Because the part of the waste water contains a large amount of harmful pollutants such as dissolved salt, the part of the waste water is recycled by adopting a multi-effect evaporation technology at present, and the zero discharge of the desulfurization waste water is realized.

In the multi-effect flash evaporation technical process, tail negative pressure steam generated in the last effect flash evaporation process generally needs to be condensed by using the existing circulating water of a power plant, so that condensed water can be generated for recycling. However, in most power plants, the circulating water cannot be provided due to the difficulty in opening pipelines or insufficient circulating water margin and the like, so that the multi-effect flash evaporation technology is difficult to implement on the desulfurization wastewater zero-discharge modification project.

disclosure of Invention

According to one aspect of the invention, the steam wet-type self-condensation device for the desulfurization wastewater zero-discharge system comprises a wet-type air cooler, a condensation water tank, a vacuum pump, a condensation water discharge pump and a condensation water point outlet, wherein the wet-type air cooler comprises a top spraying layer, a lower water tank, a circulating pump and a system pump cooling water point, the wet-type air cooler is arranged on the upstream of the condensation water tank, the wet-type air cooler is arranged at a position higher than the condensation water tank, the condensation water tank is arranged on the upstream of the vacuum pump and the condensation water discharge pump, the downstream of the condensation water discharge pump is connected with the wet-type air cooler, the condensation water point outlet is arranged on the downstream, the condensation water point outlet is connected with each water point, the circulating pump outlet is connected with the system pump cooling water point and the spraying layer, the system pump cooling water point is connected with the water tank, and a pipe pass from the wet-type air cooler to the condensation water tank and a pipe pass from the condensation water tank to a suction inlet of the vacuum pump are.

The steam wet-type self-condensing device for the desulfurization wastewater zero-discharge system has the beneficial effects that tail negative pressure steam from the multi-effect flash separation equipment enters the tube pass of the wet-type air cooler, the heat exchange tube is cooled in the wet-type air cooler equipment by adopting self-circulating spray water and condensed water discharged by a condensed water pump, mechanical forced ventilation is adopted for heat exchange, most of the cooled steam flows back into a water tank at the bottom of the equipment after heat exchange, and a small part of the cooled steam is evaporated and volatilized and is discharged along with air; the condensed water is discharged from the outlet of the wet air cooler and flows downwards into the condensed water tank under the action of gravity and vacuum negative pressure; the wet air cooler cools water consumption points of cooling water through a circulating pump and a system internal pump, so that water self-circulation inside the wet air cooler is realized, and the heat exchange pipe is cooled by adopting self-circulating spray water and condensed water discharged by a condensed water pump; when the condensed water in the condensed water tank is collected to a certain liquid level, the condensed water can be discharged to the wet air cooler for heat exchange as the make-up water by the condensed water discharge pump, and part of the condensed water can also be discharged to each water using point; the vacuum pump discharges air and incompletely condensed water vapor in the condensation water tank, and the negative pressure working condition in the condensation water tank is maintained, so that the negative pressure working condition is provided for the wet air cooler and the multi-effect flash evaporation separation system; therefore, compared with a tail steam condensing device of a traditional desulfurization wastewater multi-effect flash evaporation treatment system, the tail steam condensing device does not need to introduce circulating cooling water externally, and solves the problem that a power plant is difficult to provide the part of circulating water; a circulating water interface is not needed between the desulfurization wastewater multi-effect flash evaporation treatment system and the main device of the power plant, a circulating water pipeline is not needed to be laid, the reconstruction content is less for the reconstruction project, the influence on the circulating water system of the main device is avoided, and the implementation is easy; the wet air cooler can be arranged on the roof of a multi-effect flash evaporation treatment system building for the desulfurization wastewater, and the occupied area is not large; the water consumed by the wet air cooler is supplemented by the condensed water generated in the device, and an external water source is not required to be supplemented; because the salt content of the condensed water supplemented by the wet air cooler is low, the equipment is not easy to scale, and the long-term stable operation is facilitated; the wet air cooler has low equipment investment cost, small equipment size and easy installation and maintenance.

in some embodiments, the steam wet self-condensation device for the desulfurization wastewater zero-discharge system is characterized by further comprising a reuse water discharge pump, wherein the reuse water discharge pump is connected with the wet air cooler bottom water tank, and the reuse water discharge pump discharges condensed water in the steam condensation device to each water using point. The water pump has the beneficial effects that the reuse water discharge pump can pump the condensate water in the water tank at the bottom of the wet air cooler to each water using point.

In some embodiments, a condensate drain pump is disposed downstream of the condensate tank, the condensate drain pump being connected to the wet air cooler top spray layer. The water spray heat exchanger has the beneficial effects that the condensed water discharge pump can discharge the water in the condensed water tank to the spray layer for water supplement and heat exchange.

In some embodiments, a condensate drain pump is disposed downstream of the condensate tank, the condensate drain pump being connected to the wet air cooler bottom sump. The water supply system has the beneficial effects that the condensed water discharge pump can discharge the water in the condensed water tank to the bottom water tank of the wet air cooler for water quantity supplement.

In some embodiments, a condensate drain pump connects each water usage point and the wet air cooler simultaneously. The condensed water discharge pump has the beneficial effects that one part of water in the condensed water tank can be discharged to the wet air cooler by the condensed water discharge pump, and the other part of water is discharged to each water using point.

in some embodiments, the wet air cooler is provided with oppositely arranged ventilation openings. The ventilation opening has the advantages that the wet air cooler can adopt mechanical forced ventilation, and can stably run at low energy consumption under different environmental temperatures; when the wet air cooler is used in the areas with lower temperature in winter, spray water is not needed.

In some embodiments, a vacuum pump is connected to the top of the condensate tank. The vacuum pump has the advantages that the suction inlet of the vacuum pump is connected out from the top of the condensation water tank, air in the condensation water tank and incompletely condensed water vapor are discharged, the negative pressure working condition in the condensation water tank is maintained, and the negative pressure working condition is further provided for the wet air cooler and the multi-effect flash separation system.

According to another aspect of the invention, a steam wet-type self-condensation method for a desulfurization wastewater zero-discharge system is provided, wherein the steam wet-type self-condensation device for a desulfurization wastewater zero-discharge system is applied, tail negative pressure steam from a multi-effect flash separation device enters a tube pass of a wet air cooler, exchanges heat with spray water of a spray layer in the wet air cooler and is gradually condensed into condensation water; after the spray water in the wet air cooler exchanges heat with air, most of the spray water is cooled and flows back to a water tank at the bottom of the equipment, and a small part of the spray water is evaporated and volatilized and is discharged along with the air; the circulating power of the spray water in the wet air cooler is provided by a circulating water pump in the equipment; the condensed water is discharged from an outlet of the wet air cooler and flows downwards into a condensed water tank under the action of gravity and vacuum negative pressure; when the condensed water in the condensed water tank is collected to a certain liquid level, the condensed water is discharged to the wet air cooler by the condensed water discharge pump, and the part of the water can be directly discharged to the spray layer at the top of the wet air cooler to be used as spray water to directly exchange heat with steam; or can be discharged into a water tank at the bottom of the wet air cooler; the water discharged from the condensed water discharge pump may be discharged to the wet air cooler entirely, or a part of the water may be discharged to each water use point, and a part of the water may be discharged to the wet air cooler as makeup water. The vacuum pump suction inlet is connected out from the top of the condensation water tank, air in the condensation water tank and incompletely condensed water vapor are discharged, the negative pressure working condition in the condensation water tank is maintained, and then the negative pressure working condition is provided for the wet air cooler and the multi-effect flash evaporation separation system. The steam wet-type self-condensation system has the beneficial effects that the steam wet-type self-condensation process of the desulfurization wastewater zero-discharge system is reasonably and effectively realized, circulating cooling water is not required to be introduced from the outside, an external water source is not required to be supplemented, and the low-energy-consumption stable operation can be realized in different environments.

Drawings

FIG. 1 is a schematic structural diagram of a steam wet-type self-condensing device for a desulfurization waste water zero-discharge system according to an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of a steam wet-type self-condensing device for a desulfurization waste water zero-discharge system according to another embodiment of the present invention;

fig. 3 is a schematic structural diagram of a steam wet-type self-condensing device for a desulfurization waste water zero discharge system according to another embodiment of the present invention.

Detailed Description

the present invention will be described in further detail with reference to the accompanying drawings.

fig. 1 to 3 schematically show a steam wet self-condensing device for a desulfurization waste water zero discharge system according to an embodiment of the present invention.

The device comprises a wet air cooler 1, a condensation water tank 2, a vacuum pump 3, a condensation water discharge pump 4 and a reuse water discharge pump 6.

The wet type air cooler 1 is disposed upstream of the condensate tank 2 and is preferably disposed at a position higher than the condensate tank 2;

the wet air cooler 1 comprises a spraying layer 11 at the top, a circulating pump 13 and a system pump cooling water point 14, an outlet of the circulating pump 13 is connected with the system pump cooling water point 14 and the spraying layer 11, the system pump cooling water point 14 is connected with the water tank 12 in a return water mode, the heat exchange pipe is cooled by self-circulating spraying water and condensed water discharged by a condensed water pump in the wet air cooler 1, and heat exchange is carried out by mechanical forced ventilation;

The condensate tank 2 is disposed upstream of the vacuum pump 3 and the condensate discharge pump 4;

The condensation water tank 2 works under the negative pressure condition and is used for collecting steam condensation water;

A suction inlet of the vacuum pump 3 is connected out from the top of the condensation water tank 2 and is used for maintaining the negative pressure working condition of the condensation water tank 2;

The pipe pass of the wet air cooler 1 to the condensation water tank 2 and the suction inlet of the condensation water tank 2 to the vacuum pump 3 are a closed communication system;

As shown in fig. 1 and 2, a condensed water discharge pump 4 is disposed downstream of the condensed water tank 2 for delivering the condensed water to the top spray layer 11 of the wet air cooler 1 or the bottom water tank 12 of the wet air cooler 1;

as shown in fig. 3, the water discharged from the condensed water discharge pump 4 may be discharged to the wet air cooler 1 entirely, or may be discharged to the water consumption points 7 partially, and discharged to the wet air cooler 1 partially, as the makeup water for the wet air cooler 1;

The reuse water discharge pump 6 is connected to a bottom water tank 12 of the wet air cooler 1, and is used for discharging the condensed water in the steam condensing device to each water using point 7.

the working principle of the steam wet self-condensation method of the desulfurization wastewater zero-discharge system, namely the steam wet self-condensation device adopting the desulfurization wastewater zero-discharge system, is as follows:

1. The tail negative pressure steam 9 from the multi-effect flash separation equipment enters the tube pass of the wet air cooler 1, exchanges heat with spray water in the wet air cooler 1 and is gradually condensed into condensed water;

2. after the spray water in the wet air cooler 1 exchanges heat with air, most of the spray water is cooled and flows back to a water tank 12 at the bottom of the equipment, and a small part of the spray water is evaporated and volatilized and is discharged along with the air;

3. the circulating power of the spray water in the wet air cooler 1 is provided by a circulating water pump in the equipment;

4. The condensed water is discharged from the outlet of the wet air cooler 1 and flows downwards into the condensed water tank 2 under the action of gravity and vacuum negative pressure;

5. when the condensed water in the condensed water tank 2 is collected to a certain liquid level, the condensed water is discharged to the wet air cooler 1 by the condensed water discharge pump 4, and the part of the water can be directly discharged to the spraying layer 11 at the top of the wet air cooler 1 to be used as spraying water to directly exchange heat with steam; can also be discharged into a water tank 12 at the bottom of the wet air cooler 1;

6. As shown in fig. 3, the water discharged by the condensate discharge pump 4 may be discharged to the wet air cooler 1 entirely, or may be discharged partially to each water use point 7 and partially to the wet air cooler 1 as makeup water.

7. The 3 sunction inlets of vacuum pump connect out from 2 tops of condensate tank, and with the air in the condensate tank 2 and the steam discharge of not complete condensation, maintain the interior negative pressure operating mode of condensate tank 2, and then also provide the negative pressure operating mode for wet-type air cooler 1 and multiple-effect flash separation system.

Compared with the tail steam condensing device of the traditional desulfurization wastewater multi-effect flash evaporation treatment system, the tail steam condensing device does not need to introduce circulating cooling water externally, and solves the problem that a power plant is difficult to provide the part of circulating water; a circulating water interface is not needed between the desulfurization wastewater multi-effect flash evaporation treatment system and the main device of the power plant, a circulating water pipeline is not needed to be laid, the reconstruction content is less for the reconstruction project, the influence on the circulating water system of the main device is avoided, and the implementation is easy; the wet air cooler 1 can adopt mechanical forced ventilation and can stably run with low energy consumption under different environmental temperatures; when the wet air cooler 1 is used in an area with lower temperature in winter, spray water is not needed; the wet air cooler 1 can be arranged on the roof of a multi-effect flash evaporation treatment system building for the desulfurization wastewater, and the occupied area is not large; the water consumed by the wet air cooler 1 is supplemented by the condensed water generated in the device, and an external water source is not required to be supplemented; because the salt content of the condensed water supplemented by the wet air cooler 1 is low, the equipment is not easy to scale, and the long-term stable operation is facilitated; the wet air cooler 1 has low equipment investment cost, small equipment size and easy installation and maintenance;

what has been described above are merely some embodiments of the present invention. It will be apparent to those skilled in the art that various changes and modifications can be made without departing from the inventive concept thereof, and these changes and modifications can be made without departing from the spirit and scope of the invention.