CN110201498A - A kind of desulfurization fume dehumidification system - Google Patents

Abstract

The invention discloses a desulfurization flue gas dehumidification system, comprising: a chimney, a dehumidification chamber, a regeneration chamber, a regenerator, a condensate water tank and a cooling tower; one end of the dehumidification chamber is connected with the chimney through a pipe, and the dehumidification chamber The other end of the cooling tower is connected to the regeneration chamber through a pipeline; the regeneration chamber is connected to the condensed water tank; the condensed water tank is connected to the water inlet end of the cooling tower, and the water outlet end of the cooling tower is connected to the regeneration chamber connection; the regenerator is located between the regeneration chamber and the cooling tower, wherein one end of the regenerator is connected to the regeneration chamber, and the other end of the regenerator is connected to the cooling tower. By applying the embodiment of the present invention, moisture can be quickly separated by the method of spray dehumidification, the moisture content of flue gas is rapidly reduced, and the phenomenon of white smoke is fundamentally eliminated. Protect the environment, and at the same time recover a large amount of water, effectively reduce water consumption and smoke loss.

Description

A desulfurization flue gas dehumidification system

technical field

The invention relates to the technical field of desulfurization flue gas spray dehumidification, in particular to a desulfurization flue gas dehumidification system.

Background technique

The flue gas and tail gas generated in the production process of the existing thermal power generation, steel, biochemical and other industries generally need to undergo desulfurization and other treatments before they can be discharged into the atmosphere. Most of the existing flue gas desulfurization technologies use wet desulfurization, including the use of limestone _- gypsum wet method, ammonia water or seawater and other alkaline absorbing liquids to spray the flue gas in the desulfurization tower to absorb SO2 in the flue gas, so as to achieve flue gas desulfurization. air emission standards.

However, after the wet desulfurization treatment, the moisture content in the flue gas is large, and it is basically in a saturated state. During the emission process, the temperature of the flue gas and the atmosphere is reduced during the mixing process, and the water vapor is condensed and condensed, which is easy to form a white fog phenomenon around the chimney, commonly known as white smoke, "plume smoke". At the same time, the condensate in the chimney is carried out of the chimney mouth by the high-speed moving flue gas and falls to the surrounding ground, forming the phenomenon of "chimney rain", causing serious corrosion to the chimney and surrounding equipment.

Not only that, the moisture in the desulfurization wet flue gas mainly comes from the water consumption of the factory desulfurization system, and the desulfurization wet flue gas is directly discharged into the atmosphere, resulting in a large amount of water consumption. Taking the flue gas volume of the 330MW unit as an example, the water vapor content of the desulfurization flue gas can reach 100t/h.

In order to eliminate the white smoke phenomenon, a flue gas heat exchanger can be installed between the desulfurization tower and the chimney to increase the temperature of the flue gas to alleviate the white smoke phenomenon caused by the condensation of the flue gas, and reduce the corrosion problem of the chimney and surrounding equipment. However, due to the saturation of water in the flue gas, the heat load required for heating is huge and the cost is high; and the existing heating heat exchangers mostly use fin-and-tube heat exchangers, which have low heat transfer efficiency, large floor space, and difficult transformation; Desulfurization flue gas contains certain solid gypsum particles, which are easy to block heat exchangers and other problems.

Therefore, in order to ensure the safe operation of the chimney, some coal-fired power plants choose to use materials such as titanium and glass fiber reinforced plastic to make the chimney lining to slow down the corrosion phenomenon, which is costly. Not only that, because the flue gas emission temperature decreases and the humidity increases, it increases the difficulty of exhausting smoke, and aggravates the haze pollution to a certain extent.

The fundamental principle of chimney corrosion, white smoke, "chimney rain" and other problems lies in the high moisture content of desulfurization flue gas. The reason why the flue gas heat exchanger can solve this problem is that it increases the dry bulb temperature of the flue gas to above 80°C, thereby reducing the relative humidity of the flue gas and improving the diffusion capacity of the flue gas. If the flue gas can be dehumidified effectively, the chimney corrosion and white smoke phenomenon can be fundamentally solved, and a large amount of water can be recovered at the same time, thereby effectively reducing the water consumption and smoke exhaust loss of the power plant.

In summary, it is necessary to solve the white smoke phenomenon in the wet flue gas emission process to reduce the water vapor content in the wet flue gas.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a desulfurization flue gas dehumidification system, which aims to solve the problems of excessive moisture in the existing flue gas, corrosion of the chimney and surrounding equipment and waste of water resources.

In order to achieve the above purpose, the present invention provides a desulfurization flue gas dehumidification system, comprising: a chimney, a dehumidification chamber, a regeneration chamber, a regenerator, a condensate water tank, and a cooling tower;

One end of the dehumidification chamber is connected to the chimney through a pipeline, and the other end of the dehumidification chamber is connected to the regeneration chamber through a pipeline;

the regeneration chamber is connected to the condensate tank;

The condensed water tank is connected with the water inlet end of the cooling tower, and the water outlet end of the cooling tower is connected with the regeneration chamber;

The regenerator is located between the regeneration chamber and the cooling tower, wherein one end of the regenerator is connected to the regeneration chamber, and the other end of the regenerator is connected to the cooling tower.

Preferably, the dehumidification chamber includes: an atomizing sprayer, a flue gas pipeline; a dilute solution;

The atomizing sprayer is arranged on the inner upper end of the dehumidification chamber;

The dilute solution is located at the inner lower end of the dehumidification chamber;

The flue gas pipeline is arranged outside the dehumidification chamber, between the atomizing sprayer and the dilute solution, and the flue gas pipeline receives the gas to be treated.

Preferably, the regeneration chamber includes: a condensing coil, a water tray, a heat exchanger, a factory waste heat inlet pipeline, and a factory waste heat outlet pipeline;

The condensing coil is arranged at the upper end of the interior of the regeneration chamber, one end of the condensing coil is connected to the regenerator, and the other end of the condensing coil is connected to the cooling tower;

The heat exchanger is located at the inner lower end of the regeneration chamber, and is connected to the dehumidification chamber through the heat regenerator;

The water tray is arranged between the condensing coil and the heat exchanger;

The factory waste heat inlet pipeline is connected to one end of the heat exchanger, and the other end of the heat exchanger is connected to the factory waste heat outlet pipeline.

Preferably, it also includes: municipal water pipeline;

One end of the municipal water pipeline is connected to the water tray, and the other end of the municipal water pipeline is connected to the condensed water tank.

In an implementation manner, the level of the ground of the regeneration chamber is 5-8 meters higher than the height of the dilute solution in the dehumidification chamber.

Preferably, the top of the regeneration chamber is provided with a valve, a dryer and a vacuum pump;

One end of the valve is connected to the regeneration chamber, and the other end of the valve is connected to the dryer;

The dryer is connected to a vacuum pump.

Preferably, the heat exchanger adopts a low-grade heat source with a temperature range of 55-90°C.

By applying the desulfurization flue gas dehumidification system provided by the embodiment of the present invention, the desulfurization flue gas can quickly separate moisture by spraying and dehumidifying, the moisture content of the flue gas is rapidly reduced, and the white smoke phenomenon is fundamentally eliminated. Protect the environment, and at the same time recover a large amount of water, effectively reduce water consumption and smoke loss.

Description of drawings

FIG. 1 is a first structural schematic diagram of an embodiment of the present invention.

FIG. 2 is a schematic diagram of the second structure of the embodiment of the present invention.

Detailed ways

The embodiments of the present invention are described below through specific specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention.

See Figure 1-2. It should be noted that the drawings provided in this embodiment are only to illustrate the basic concept of the present invention in a schematic way, so the drawings only show the components related to the present invention rather than the number, shape and the number of components in actual implementation. For dimension drawing, the type, quantity and proportion of each component can be changed at will in actual implementation, and the component layout may also be more complicated.

As shown in Figure 1, the present invention provides a desulfurization flue gas dehumidification system, including: a chimney 1, a dehumidification chamber 2, a regeneration chamber 13, a regenerator 15, a condensate tank 6, and a cooling tower 7; one end of the dehumidification chamber 2 is connected to the The chimney 1 is connected by a pipeline, and the other end of the dehumidification chamber 2 is connected with the regeneration chamber 13 by a pipeline; the regeneration chamber 13 is connected with the condensed water tank 6 ; The water outlet end of the cooling tower 7 is connected to the regeneration chamber 13; the regenerator 15 is located between the regeneration chamber 13 and the cooling tower 7, wherein one end of the regenerator 15 is connected to the The regeneration chamber 13 is connected, and the other end of the regenerator 15 is connected with the cooling tower 7 .

It should be noted that the desulfurization flue gas enters the dehumidification chamber 2 through the pipeline, and is fully contacted with the dehumidifying solution in the dehumidification chamber 2. The moisture in the flue gas is absorbed by the dehumidifying solution, and the dehumidified flue gas flows to the chimney 1 through the pipeline. medium emissions. The dehumidified dilute solution enters the regeneration chamber 13 for flash regeneration under the action of the dilute solution pump 2-1.

Since a large amount of water is generated during the evaporation of the solution, the generated condensed water flows into the condensed water tank 6 with a vertical downward distance of more than 9.8 meters through the condensed water pump 2-6 through the pipeline under the action of gravity. Flow down, and make the regeneration chamber 13 and the condensate tank 6 maintain pressure balance, do not use the vacuum valve at all, flow to the condensate tank 6 for storage, in order to supplement the water consumption of the cooling tower 7, wherein the condensate pump 2-6 is connected with the condensate tank 6. The pipeline is provided with valves 3-6. Referring to FIG. 1 , the cooling tower 7 also includes a cooling tower return water pipeline 8 and a cooling tower water outlet pipeline 9, through which water is circulated.

In an implementation manner, a pump 2-3 and a valve 3-1 may also be provided at the connection between the condensed water tank 6 and the cooling tower 7, and the water flow exchange is realized through the pump 2-3, and the on-off control is realized through the valve.

In order to ensure the vacuum degree in the regeneration chamber 13, the condensed water system can be used to condense and recover the stored water vapor. After the cooling water completes the heat exchange in the regenerator 15, the separated part of the water is transported out by the pump 2-5 along the pipeline, and enters the return water. In the heater 15, heat is exchanged with the regenerated concentrated solution to reduce the temperature of the dehumidifying solution. After leaving the regenerator 15, the moisture finally enters the cooling tower 7 for cooling. The concentrated solution enters the dehumidification chamber 2 for circulation under the driving of the concentrated solution pump 2-2. It can be understood that, a valve 3-5 may also be provided at the connection between the pump 2-5 and the condensing coil.

Preferably, the dehumidification chamber 2 includes: an atomizing sprayer 3, a flue gas pipeline 4, and a dilute solution 5;

The atomizing sprayer 3 is arranged on the inner upper end of the dehumidification chamber 2;

The dilute solution 5 is located at the inner lower end of the dehumidification chamber 2;

The flue gas pipeline 4 is arranged outside the dehumidification chamber 2, between the atomizing sprayer 3 and the dilute solution 5, and the flue gas pipeline 4 receives the gas to be treated.

It should be noted that the chimney 1 is connected to the dehumidification chamber 2 through a pipeline. An atomizing sprayer 3 is installed on the upper part of the dehumidification chamber 2. The factory desulfurization wet flue gas enters the dehumidification chamber 2 through the flue gas pipeline 4, and is sprayed by the atomizing sprayer 3 to absorb moisture. Enter the chimney 1 through the pipeline for discharge. The moisture in the flue gas is absorbed by the dehumidifying solution sprayed by the atomizing sprayer 3 and falls into the dilute solution chamber 5. The specific dehumidifying solution can be calcium chloride solution, lithium bromide solution or lithium chloride solution. At this time, up to 65% of the moisture in the flue gas can be removed, and then the flue gas is discharged into the chimney 1 through the pipeline. The concentrated solution is fully contacted with the desulfurized flue gas and absorbs a large amount of water to become a dilute solution, and then enters the regeneration chamber 13 for flash regeneration under the action of the dilute solution pump 2-1.

In an implementation manner, the regeneration chamber 3 includes: a condensing coil 11, a water tray 12, a heat exchanger 14, a factory waste heat inlet pipeline 16, and a factory waste heat outlet pipeline 17;

The condensing coil 11 is arranged at the upper end of the regeneration chamber 3, one end of the condensing coil 11 is connected to the regenerator 4, and the other end of the condensing coil 11 is connected to the cooling tower 6;

The heat exchanger 14 is located at the inner lower end of the regeneration chamber 3, and is connected to the dehumidification chamber 2 through the regenerator 4;

The water tray 12 is arranged between the condensing coil 11 and the heat exchanger 14;

The factory waste heat inlet pipe 16 is connected to one end of the heat exchanger 14 , and the other end of the heat exchanger 14 is connected to the factory waste heat outlet pipe 17 .

It should be noted that the dilute solution 5 is sent into the regeneration chamber 13 by the dilute solution pump 2-1 via a pipeline. The heat source of the heat exchanger 14 is from the industrial waste heat cycle. Open the valve 3-7 and valve 3-8 in the regeneration room, and the engineering waste heat is sent into the heat exchanger 14 through the waste heat pump 2-7 through the waste heat inlet pipeline 16 of the factory. For new energy sources such as wind energy, the temperature range is 55-90°C. The ambient pressure of the regeneration chamber 13 can be changed according to the temperature of the heat source, and the waste heat pumps 2-7 can also be changed according to the properties of different heat sources. After the heat exchange process is completed, the factory waste heat is discharged through the factory waste heat outlet pipe 17 . The water vapor generated by the evaporation of the solution contacts the condensing coil 11 , condenses and falls into the water tray 12 . The cooling water in the condensing coil 11 is provided by the cooling tower 7, and the cooling water is sent into the condensing coil 11 by the cooling water pump 2-4 through the pipeline. After the cooling water completes the heat exchange process, it is transported out of the condensing coil 11 by the cooling water pumps 2-5 along the pipeline, and enters the regenerator 15 to exchange heat with the regenerated concentrated solution to reduce the temperature of the dehumidifying solution. After leaving the regenerator 15, it finally enters the cooling tower 7 for cooling. A valve 3-3 can also be installed between the cooling water pump 2-4 and the condensing coil 11 .

Preferably, it also includes: a municipal water pipeline 10;

One end of the municipal water pipeline 10 is connected to the water tray 12 , and the other end of the municipal water pipeline 10 is connected to the condensed water tank 7 .

It should be noted that the municipal water pipeline 10 is arranged at the inlet end of the condensed water tank 6, and the municipal water pipeline 10 is controlled by the valve 3-2. The cooling tower 7 operates stably.

Specifically, the valve 3-4 can be set on the line manifold of the valve 3-2 and the valve 2-6 to realize the simultaneous control of the two pipelines.

In an implementation manner, the level of the ground of the regeneration chamber 13 is 5-8 meters higher than the height of the dilute solution 5 in the dehumidification chamber 2 .

It can be understood that the horizontal height of the ground of the regeneration chamber 13 is 5-8 meters higher than the height of the dilute solution 5 in the dehumidification chamber 2. By adjusting the height and the intermittent pumping time of the dilute solution pump 2-1, the solution flow and the flow rate can be controlled. The vacuum level is operated, so that the regeneration chamber 13 and the open dehumidification chamber 2 are directly connected without the use of vacuum valves, etc., which fundamentally avoids the problem of vacuum valve corrosion, and realizes the problem of continuous operation between the open system and the vacuum system. The vertical height of the solution pipeline is generally 10m and above.

Preferably, the top of the regeneration chamber 13 is provided with a valve 3-9, a dryer 18, and a vacuum pump 2-8;

One end of the valve 3-9 is connected with the regeneration chamber 13, and the other end of the valve 3-9 is connected with the dryer 18;

The dryer 18 is connected to the vacuum pump 2-8.

The dryer 18 is arranged between the vacuum pump 2-8 and the valve 3-9, and is used for absorbing moisture to ensure that the air sucked by the vacuum pump 2-8 is dry air.

It can be understood that, in the initial stage of the system, the vacuum pump 2-8 is started, the valve 3-9 is opened, and the air in the regeneration chamber 13 is extracted to ensure its vacuum degree. Since there is inevitably a very small amount of moisture in the air sucked in by the vacuum pump 2-8, a dryer 18 is installed in front of the vacuum pump 2-8 to absorb moisture to ensure that all the air entering the vacuum pump 2-8 is dry air. When the system enters stable operation, the vacuum pump 2-8 and valve 3-9 can be closed, and the vacuum degree of the regeneration chamber 13 can be maintained only by the vertical height difference of the solution in the pipeline. The vacuum pump 2-8 and the vacuum valve 3-9 are activated only when the vacuum chamber 13 pressure is greatly increased or needs to be changed.

In an implementation manner, the heat exchanger 14 uses a low-grade heat source with a temperature range of 55-90°C.

It can be understood that the external low-grade heat source includes, but is not limited to, factory auxiliary steam, low-temperature hot water, or new energy sources such as solar energy and wind energy. The waste heat pump 2-7 is arranged between the factory waste heat inlet pipe 16 and the factory waste heat outlet pipe 17, the factory waste heat inlet pipe 16 is provided with a valve 3-7, and the factory waste heat outlet pipe 17 is provided with a valve 3 -8.

The above-mentioned embodiments merely illustrate the principles and effects of the present invention, but are not intended to limit the present invention. Anyone skilled in the art can modify or change the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the technical field without departing from the spirit and technical idea disclosed in the present invention should still be covered by the claims of the present invention.

Claims (7)

1. A desulfurization flue gas dehumidification system is characterized in that, comprising: chimney (1), dehumidification chamber (2), regeneration chamber (13), regenerator (15), condensate tank (6), cooling tower (7) ); One end of the dehumidification chamber (2) is connected to the chimney (1) through a pipeline, and the other end of the dehumidification chamber (2) is connected to the regeneration chamber (13) through a pipeline; The regeneration chamber (13) is connected with the condensate tank (6); The condensed water tank (6) is connected with the water inlet end of the cooling tower (7), and the water outlet end of the cooling tower (7) is connected with the regeneration chamber (13); The regenerator (15) is located between the regeneration chamber (13) and the cooling tower (7), wherein one end of the regenerator (15) is connected to the regeneration chamber (13), and the regenerator (15) The other end is connected to the cooling tower (7). 2. A desulfurization flue gas dehumidification system according to claim 1, wherein the dehumidification chamber (2) comprises: an atomizing sprayer (3), a flue gas pipeline (4); a dilute solution ( 5); The atomizing sprayer (3) is arranged at the inner upper end of the dehumidification chamber (2); The dilute solution (5) is located at the inner lower end of the dehumidification chamber (2); The flue gas pipeline (4) is arranged outside the dehumidification chamber (2), between the atomizing sprayer (3) and the dilute solution (5), and the flue gas pipeline ( 4) Receive the gas to be treated. 3. A desulfurization flue gas dehumidification system according to claim 1, wherein the regeneration chamber (3) comprises: a condensation coil (11), a water tray (12), a heat exchanger (14) ), factory waste heat inlet pipeline (16), factory waste heat outlet pipeline (17); The condensation coil (11) is arranged at the upper end inside the regeneration chamber (3), one end of the condensation coil (11) is connected to the regenerator (4), and the condensation coil (11) The other end is connected with the cooling tower (6); The heat exchanger (14) is located at the inner lower end of the regeneration chamber (3), and is connected to the dehumidification chamber (2) through the regenerator (4); The water tray (12) is arranged between the condensing coil (11) and the heat exchanger (14); The factory waste heat inlet pipeline (16) is connected to one end of the heat exchanger (14), and the other end of the heat exchanger (14) is connected to the factory waste heat outlet pipeline (17). 4. A desulfurization flue gas dehumidification system according to claim 1, characterized in that, further comprising: a municipal water pipeline (10); One end of the municipal water pipeline (10) is connected to the water tray (12), and the other end of the municipal water pipeline (10) is connected to the condensate water tank (7). 5. A desulfurization flue gas dehumidification system according to claim 1, 2, wherein the level of the ground of the regeneration chamber (13) is higher than the height of the dilute solution (5) in the dehumidification chamber (2) by 5-8 meters. 6. A desulfurization flue gas dehumidification system according to claim 1, wherein the top of the regeneration chamber (13) is provided with a valve, a dryer (20) and a vacuum pump; One end of the valve is connected to the regeneration chamber (13), and the other end of the valve is connected to the dryer (20); The dryer (20) is connected with a vacuum pump. 7 . The desulfurization flue gas dehumidification system according to claim 1 , wherein the heat exchanger ( 14 ) adopts a low-grade heat source, and the temperature range is 55-90° C. 8 .