Exhaust treatment device for drain tank of urea hydrolysis system

Abstract

The utility model discloses an exhaust treatment device for a drain tank of a urea hydrolysis system, which belongs to the technical field of air pollution control and comprises a drain tank body communicated with a condensate water inlet pipe and a condensate water outlet pipe. The spraying mechanism is arranged in the drain tank body, and the spraying mechanism is connected with a factory desalting water pump; the cooling mechanism is connected with the drain tank body; and the temperature controller is arranged on the cooling mechanism. By arranging the spraying mechanism and the cooling mechanism, the flash gas in the drain tank body is cooled, diluted or neutralized for multiple times, the technical problem that a large amount of white smoke is formed when the flash gas formed after flash evaporation of condensate water is discharged out of the drain tank body is solved, and the technical effect of reducing formation of the white smoke is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of air pollution control, in particular to an exhaust treatment device for a drain box of a urea hydrolysis system. Background Art

[0002] In the urea water system of a thermal power plant, the urea solution in the hydrolyzer is heated by saturated steam. The heated steam is condensed to produce condensed water, which is then sent to a drain tank through a drain valve. In the prior art, since the drain tank is a normal pressure container, the condensed water will flash when flowing into the drain tank. The flash gas formed after the flash evaporation of the condensed water may contain moisture and impurities. If it is directly discharged into the atmosphere without treatment, the so-called "white smoke" will be formed. Especially in an environment with low temperature, the smoke is more obvious, which has a certain impact on the environment. Utility Model Content

[0003] In order to solve the above problems, the utility model provides an exhaust treatment device for a urea hydrolysis system drain tank, comprising:

[0004] A drain box body, the drain box body is used to collect condensed water generated during the hydrolysis of urea, one side of the drain box body is connected to a condensed water inlet pipe, and the side of the drain box body away from the condensed water inlet pipe is also connected to a condensed water outlet pipe;

[0005] A spray mechanism, wherein the spray mechanism is disposed in the drain tank body, and one end of the spray mechanism is connected to a desalted water pump, so that desalted water is sprayed through the spray mechanism to cool the flash gas in the drain tank body;

[0006] A cooling mechanism, the cooling mechanism is connected to the drain tank body to further cool the flash gas discharged from the drain tank body;

[0007] A temperature controller is arranged on the cooling mechanism, and the temperature controller is respectively connected to the spray mechanism and the cooling mechanism in telecommunication, and the temperature controller is used to adjust the working efficiency of the spray mechanism and the cooling mechanism.

[0008] Optionally, the drain tank body is also connected to a flash gas condenser pipe, so that the flashed gas in the drain tank body is discharged through the flash gas condenser pipe.

[0009] Optionally, the spray mechanism comprises:

[0010] A desalted water pipe, the desalted water pipe is connected to the drain tank body and extends to the interior of the drain tank body;

[0011] A desalted water valve, the desalted water valve is arranged on the desalted water pipe, and the desalted water valve is electrically connected to the temperature controller;

[0012] A plurality of sprayers are evenly arranged at the bottom end of the desalted water pipe and are all connected with the desalted water pipe, so as to spray the desalted water in the desalted water pipe through the plurality of sprayers.

[0013] Optionally, the cooling mechanism comprises:

[0014] A condenser, the condenser is connected to an end of the flash gas condensation water pipe away from the drain tank body, and the condenser is used to cool the flash gas discharged from the drain tank body;

[0015] A cooling water inlet pipe, one end of which is connected to the water pump and the other end of which is connected to the condenser, and the cooling water inlet pipe is used to deliver cooling water to the condenser;

[0016] A cooling water return pipe, one end of which is connected to the condenser and the other end of which is connected to the water reservoir. The cooling water return pipe is used to allow the cooling water entering the condenser to flow out to the water reservoir;

[0017] A vent pipe, one end of which is connected to the condenser so that a small amount of flash gas cooled by the condenser is discharged through the vent pipe.

[0018] Optionally, the spraying direction of the sprayer is opposite to the outflow direction of the flash gas in the drain tank body.

[0019] Optionally, a cooling water inlet valve is provided on the cooling water inlet pipe, and a cooling water return valve is provided on the cooling water return pipe.

[0020] Optionally, the cooling water inlet valve and the cooling water return valve are both electrically connected to the temperature controller.

[0021] Optionally, the temperature controller is disposed on the vent pipe so that the temperature controller can detect the temperature of the flash gas discharged after being cooled.

[0022] By adopting the above technical solution, the utility model mainly has the following technical effects:

[0023] By setting up a spraying mechanism and a cooling mechanism, the flash gas in the drain tank body is cooled, diluted or neutralized multiple times, which solves the technical problem that the flash gas formed after the flash evaporation of condensed water forms a large amount of white smoke when discharged from the drain tank body, and achieves the technical effect of reducing the formation of white smoke. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a structural schematic diagram of an exhaust treatment device for a urea hydrolysis system drain tank according to the utility model;

[0025] The meanings of the reference numerals are as follows:

[0026] 1. Drain tank body; 11. Condensate water inlet pipe; 12. Condensate water outlet pipe; 13. Flash gas condenser pipe;

[0027] 2. Spraying mechanism; 21. Desalted water pipe; 22. Desalted water valve; 23. Sprayer;

[0028] 3. Cooling mechanism; 31. Condenser; 32. Cooling water inlet pipe; 321. Cooling water inlet valve; 33. Cooling water return pipe; 331. Cooling water return valve; 34. Vent pipe;

[0029] 4. Temperature controller. DETAILED DESCRIPTION

[0030] In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the specification of the utility model. Obviously, the described embodiment is only a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0031] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present invention. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0032] Example

[0033] See also Figure 1 As shown, the utility model provides an exhaust treatment device for a urea hydrolysis system drain tank. In actual application, in order to reduce the formation of a large amount of white smoke when the flash gas formed after the flash evaporation of condensed water is discharged, the device includes a drain tank body 1, a spray mechanism 2 connected to the drain tank body 1, a cooling mechanism 3 connected to the drain tank body 1, and a temperature control module 4 arranged on the cooling mechanism 3.

[0034] The drain tank body 1 is used to collect condensed water generated during the hydrolysis of urea. The condensed water is introduced into the drain tank body 1 to achieve the recycling of the condensed water. A condensed water inlet pipe 11 is provided on one side of the drain tank body 1. The condensed water inlet pipe 11 is connected to one side of the drain tank body 1 to guide the condensed water generated during the hydrolysis of urea into the drain tank body 1 through the condensed water inlet pipe 11 for recycling. A condensed water outlet pipe 12 is also provided on the side of the drain tank body 1 away from the condensed water inlet pipe 11, and the condensed water outlet pipe 12 is connected to the drain tank body 1 so that the condensed water in the drain tank body 1 can be discharged to the next process through the condensed water outlet pipe 12. Among them, a flash gas condenser pipe 13 is also provided on the drain tank body 1. The flash gas condenser pipe 13 is connected to the drain tank body 1 to discharge the flash gas in the drain tank body 1 through the flash gas condenser pipe 13. Preferably, in order to facilitate smooth discharge of the flash gas in the drain tank body 1, the flash gas condenser 13 is arranged at the top of the drain tank body 1, so that the flash gas can be discharged quickly by utilizing the natural principle that hot air rises and cold air sinks.

[0035] The spray mechanism 2 is disposed in the drain tank body 1 , and the spray mechanism 2 is connected to a desalted water pump so that the desalted water is sprayed by the spray mechanism 2 to cool, dilute or neutralize the flash gas in the drain tank body 1 .

[0036] The cooling mechanism 3 is connected to the drain box body 1 to further cool the flash gas discharged from the drain box body 1. The cooled flash gas is then discharged into the air by the cooling mechanism 3, which can greatly reduce the temperature of the flash gas when it is discharged into the air.

[0037] The temperature control module 4 is arranged on the cooling mechanism 3, and the temperature control module 4 is respectively connected to the spray mechanism 2 and the cooling mechanism 3 by telecommunication. The temperature control module (4) is used to adjust the spray mechanism (2) and the cooling mechanism (3) to improve the accuracy of flash gas temperature control.

[0038] In the present embodiment, when the condensed water generated during the hydrolysis of urea enters the drain tank body 1 through the condensed water inlet pipe 11, the condensed water flashes in the drain tank body 1. At this time, the spray mechanism 2 sprays desalted water in the drain tank body 1 to preliminarily cool the flash gas in the drain tank body 1. The water and impurity content in the flash gas is reduced by cooling, diluting or neutralizing, thereby effectively reducing the generation of white smoke. The flash gas discharged from the drain tank body 1 enters the cooling mechanism 3 again. At this time, the cooling mechanism 3 works to cool the flash gas for a second time, thereby reducing the saturated vapor pressure of the flash gas. The flash gas is then discharged by the cooling mechanism 3, so that it is not easy to condense when it comes into contact with a colder environment, thereby reducing the generation of white smoke.

[0039] In this embodiment, the spray mechanism 2 includes a desalted water pipe 21, a desalted water valve 22 and a plurality of sprayers 23. The desalted water pipe 21 is connected to the drain tank body 1, and the desalted water pipe 21 is airtightly penetrated through the wall of the drain tank body 1 and extends to the inside, so that the desalted water can enter the drain tank body 1 for spraying. The desalted water valve 22 is arranged on the desalted water pipe 21, and the desalted water valve 22 is connected to the temperature control module 4 by telecommunication, so that the temperature control module 4 can control the opening and closing degree of the desalted water valve 22, and then control the flow rate of the desalted water entering the desalted water pipe 21. The plurality of sprayers 23 are evenly arranged at the bottom end of the desalted water pipe 21, and are all connected to the desalted water pipe 21, so that the desalted water in the desalted water pipe 21 can be evenly sprayed out by the plurality of sprayers 23, and the flash gas in the drain tank body 1 can be quickly cooled down.

[0040] In this embodiment, the cooling mechanism 3 includes a condenser 31, a cooling water inlet pipe 32, a cooling water return pipe 33 and a vent pipe 34. The condenser 31 is connected to the end of the flash gas condenser pipe 13 away from the drain tank body 1, and the condenser 31 is used to cool the discharged flash gas, wherein the condenser 31 can be a plate-type water-cooled condenser 31. One end of the cooling water inlet pipe 32 is connected to the cooling water pump in the plant area, and the other end is connected to the condenser 31. The cooling water inlet pipe 32 is used to deliver cooling water to the condenser 31 to cool the flash gas entering the condenser 31. One end of the cooling water outlet pipe is connected to the condenser 31, and the other end is connected to the water reservoir in the external plant area. The cooling water return pipe 33 is used to allow the cooling water entering the condenser 31 to flow out to the water reservoir. Specifically, after the cooling water enters the condenser 31 through the cooling water inlet pipe 32, it absorbs the heat of the flash gas in the condenser 31, and then takes out the heat through the cooling water return pipe 33, and the condensed water continues to enter the condenser 31 and is discharged, thereby achieving the purpose of cooling the flash gas through heat exchange. One end of the vent pipe 34 is connected to the condenser 31, so that the flash gas cooled by the condenser 31 is discharged into the air through the vent pipe 34.

[0041] In some preferred embodiments, the cooling water inlet pipe 32 is provided with a cooling water inlet valve 321, and the cooling water inlet valve 321 controls the flow rate of cooling water entering the condenser 31 by controlling the degree of its opening and closing. The cooling water return pipe 33 is provided with a cooling water return valve 331, and the opening and closing degree of the cooling water return valve 331 is adapted to the opening and closing degree of the cooling water inlet valve 321, so as to control the flow rate of cooling water flowing out of the condenser 31, that is, the ... return valve 321, so as to control the flow rate of cooling water flowing out of the condenser 31, that is, the cooling water return pipe 33 is provided with a cooling water return valve 331, and the opening and closing degree of the cooling water return valve 331 is adapted to the opening and closing degree of the cooling water return valve 331, and the cooling water return valve 331 is provided with a cooling water return valve 331, and the opening and closing degree of the cooling water return valve 331 is adapted to the opening and closing degree of the cooling water return valve 331, and the cooling water return valve 331 is provided with a cooling water return valve 331, and the cooling water return valve 331 is provided with a cooling water return valve 331, and the cooling water return valve 331 is provided with a cooling water return valve 331, and the cooling water return valve 331 is provided with a cooling water return valve 331 The opening and closing degree of the water return valve 331 is equal to the opening and closing degree of the cooling water inlet valve 321, so as to achieve a stable flow rate of cooling water in the condenser 31 and improve the cooling efficiency, and the cooling water inlet valve 321 and the cooling water return valve 331 are both electrically connected to the temperature control module 4, so that the temperature control module 4 controls the opening and closing degree of the cooling water inlet valve 321 and the cooling water return valve 331, thereby controlling the flow rate of cooling water in the cooling water inlet pipe 32 and the cooling water return pipe 33.

[0042] In this embodiment, the temperature control module 4 further includes a temperature sensor and a temperature controller. The temperature sensor is used to obtain the temperature of the flash gas after cooling. The temperature controller is used to adjust the spray mechanism 2 and the cooling mechanism 3 according to the temperature obtained by the temperature sensor. For example, when the temperature sensor senses the temperature change of the flash gas in the vent pipe 34, the data is transmitted to the temperature controller, and then the temperature controller adjusts the opening and closing degree of the desalted water valve 22, the cooling water inlet valve 321 and the cooling water return valve 331, thereby adjusting the amount of desalted water sprayed by the sprinkler 23, and the flow rate and discharge amount of cooling water entering the condenser 31. For example, when the temperature sensor detects that the temperature of the flash gas is high, the temperature controller controls the desalted water valve 22, the cooling water inlet valve 321 and the cooling water return valve 331 to open to the maximum extent, so as to increase the flow rate of the desalted water and the circulating cooling water, thereby indirectly increasing the consumption of the desalted water and the circulating cooling water. On the contrary, the desalted water valve 22, the cooling water inlet valve 321 and the cooling water return valve 331 are only opened to half the extent, thereby reducing the consumption of the desalted water and the circulating cooling water.

[0043] In some preferred embodiments, the temperature sensor is arranged at the end of the vent pipe 34 away from the end connected to the condenser 31, so that the temperature sensor detects the temperature of the flash gas after the flash gas is cooled by the condenser 31 and finally discharged into the air, so that the staff can understand the specific working status of the spray mechanism 2 and the cooling mechanism 3, thereby improving the accuracy of the flash gas temperature control.

[0044] Finally, it should be noted that the embodiments of the present invention disclose only preferred embodiments of the present invention, which are only used to illustrate the technical solutions of the present invention, rather than to limit them. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A urea hydrolysis system drain tank exhaust treatment device, characterized in that: include: A drain box body (1), the drain box body (1) being used to collect condensed water generated during the hydrolysis of urea, one side of the drain box body (1) being connected to a condensed water inlet pipe (11), and the side of the drain box body (1) away from the condensed water inlet pipe (11) being connected to a condensed water outlet pipe (12); A spray mechanism (2), wherein the spray mechanism (2) is arranged in the drain tank body (1), and one end of the spray mechanism (2) is connected to a desalted water pump so that desalted water is sprayed through the spray mechanism (2) to cool the flash gas in the drain tank body (1); A cooling mechanism (3), the cooling mechanism (3) being connected to the drain tank body (1) so as to further cool the flash gas discharged from the drain tank body (1); A temperature control module (4), the temperature control module (4) being arranged on the cooling mechanism (3), and the temperature control module (4) being respectively connected to the spray mechanism (2) and the cooling mechanism (3) by telecommunication, and the temperature control module (4) being used to adjust the spray mechanism (2) and the cooling mechanism (3).

2. The urea hydrolysis system drain tank exhaust treatment device according to claim 1, characterized in that: The drain tank body (1) is also connected to a flash gas condenser (13), so that the flashed gas in the drain tank body (1) is discharged through the flash gas condenser (13).

3. The exhaust treatment device for a urea hydrolysis system drain tank according to claim 1, characterized in that: The spray mechanism (2) comprises: a demineralized water pipe (21), the demineralized water pipe (21) being connected to the drain tank body (1) and extending into the interior of the drain tank body (1); a desalted water valve (22), the desalted water valve (22) being arranged on the desalted water pipe (21), and the desalted water valve (22) being connected to the temperature control module (4) by telecommunication, so that the degree of opening and closing of the desalted water valve (22) can be adjusted by the temperature control module (4); A plurality of sprayers (23) are evenly arranged at the bottom end of the desalted water pipe (21) and are all connected to the desalted water pipe (21). The desalted water in the desalted water pipe (21) is sprayed out through the plurality of sprayers (23).

4. The exhaust treatment device for a urea hydrolysis system drain tank according to claim 2, characterized in that: The cooling mechanism (3) comprises: a condenser (31), the condenser (31) being in communication with an end of the flash gas condensation pipe (13) away from the drain tank body (1), the condenser (31) being used to cool the flash gas discharged from the drain tank body (1); a cooling water inlet pipe (32), one end of the cooling water inlet pipe (32) being connected to a water pump, and the other end of the cooling water inlet pipe (32) being connected to the condenser (31), and the cooling water inlet pipe (32) being used to deliver cooling water to the condenser (31); a cooling water return pipe (33), one end of the cooling water return pipe (33) being in communication with the condenser (31) and the other end of the cooling water return pipe (33) being in communication with the water reservoir, the cooling water return pipe (33) being used to allow the cooling water entering the condenser (31) to flow out into the water reservoir; A vent pipe (34), one end of which is in communication with the condenser (31), so that the flash gas cooled by the condenser (31) is discharged through the vent pipe (34).

5. The exhaust treatment device for a urea hydrolysis system drain tank according to claim 4, characterized in that: The temperature control module (4) comprises: A temperature sensor, wherein the temperature sensor is used to obtain the temperature of the flash gas after cooling; A temperature controller, the temperature controller is used to adjust the spray mechanism (2) and the cooling mechanism (3) according to the temperature obtained by the temperature sensor.

6. The exhaust treatment device for a urea hydrolysis system drain tank according to claim 4, characterized in that: The cooling water inlet pipe (32) is provided with a cooling water inlet valve (321), and the cooling water return pipe (33) is provided with a cooling water return valve (331).

7. The exhaust treatment device for a urea hydrolysis system drain tank according to claim 6, characterized in that: The cooling water inlet valve (321) and the cooling water return valve (331) are both electrically connected to the temperature control module (4).

8. The exhaust treatment device for a urea hydrolysis system drain tank according to claim 5, characterized in that: The temperature sensor is arranged on the vent pipe (34) so ​​that the temperature sensor detects the temperature of the flash gas when it is discharged into the air after being cooled.

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