Abnormal ammonia gas removal device for municipal sludge incineration flue gas

Abstract

The utility model belongs to the technical field of flue gas treatment, and particularly discloses an abnormal ammonia gas removal device for municipal sludge incineration flue gas, which comprises a first spray tower, a second spray tower, a third spray tower and a fourth spray tower through which the flue gas sequentially flows, and further comprises an acid storage tank, when the ammonia gas index in the flue gas is greater than a threshold value, an acid solution is introduced into the first spray tower through an acid storage tank; and when the ammonia gas index in the flue gas is smaller than the threshold value, the acid storage tank stops introducing the acid solution into the first spray tower. According to the utility model, acid liquid can be introduced into the first spray tower according to excessive ammonia gas generated under special conditions, and the first spray tower is changed from a washing spray tower to an acid pickling spray tower, so that the acid liquid and the ammonia gas in the flue gas are subjected to neutralization reaction, and the excessive ammonia gas in the flue gas is removed; when the ammonia gas index is normal, the introduction of the acidic liquid into the first spray tower is stopped, and the first spray tower is changed into the washing spray tower again, so that the mechanism is flexible and variable, and the effect is good.

Description

TECHNICAL FIELD

[0001] The utility model relates to a flue gas treatment technical field especially a kind of abnormal ammonia removal device for municipal sludge incineration flue gas. BACKGROUND

[0002] Municipal sludge is collected and transported to sludge disposal plant, is transported to incinerator by sludge pump and sludge delivery pipe and is burned, is treated by harmless.In normal circumstances, the flue gas generated after sludge is burned by incinerator is discharged into the atmosphere after a series of equipment treatment such as dust collector and spray tower etc.Reference Figure 1 , the existing spray tower system includes first spray tower (1) for flue gas sequentially flows through, second spray tower (2), third spray tower (3) and fourth spray tower (4), also includes alkali storage tank (9), alkali storage tank (9) stores alkali liquid, alkali storage tank (9) is connected with second spray tower (2) and third spray tower (3) by second main pipe (10), first spray tower (1) and fourth spray tower (4) are water washing spray tower, second spray tower (2) and third spray tower (3) are alkali washing spray tower because of the alkali liquid, the purpose of the alkali liquid is to remove hydrogen sulfide, hydrogen chloride and other acid gases in flue gas.

[0003] However, in special circumstances, for example: when the combustion in incinerator is not sufficient and the excessive decomposition of nitrogen-containing organic matter, or when nitrogen oxides occur reduction reaction under certain conditions during incineration, excessive ammonia will be produced in these circumstances, and ammonia is colorless and has irritating odor, which will affect air quality and the life of surrounding residents if it is discharged into the atmosphere. INVENTION CONTENTS

[0004] In view of the technical problem that the existing spray system cannot treat excessive ammonia produced in special circumstances in real time, the utility model provides a kind of abnormal ammonia removal device for municipal sludge incineration flue gas.

[0005] The technical scheme adopted by the utility model is: abnormal ammonia removal device for municipal sludge incineration flue gas, including first spray tower, second spray tower, third spray tower and fourth spray tower for flue gas sequentially flows through, still including acid storage tank, acid storage tank stores acid liquid, acid storage tank is connected with first spray tower by first main pipe, first pump for providing power is arranged on first main pipe, first valve is arranged on the first main pipe of the two ends of first pump;When ammonia index in flue gas is greater than threshold value, acid solution is introduced into first spray tower by acid storage tank;When ammonia index in flue gas is less than threshold value, acid storage tank stops introducing acid solution into first spray tower.

[0006] Further, the spare pipe is connected at one end to the first main pipe between the first pump and the first spray tower and at the other end to the first main pipe between the first pump and the acid storage tank, a second pump is arranged on the spare pipe, second valves are arranged on the spare pipe at both ends of the second pump, and the first pump and the second pump are used alternately.

[0007] Further, a first check valve is arranged at the end of the first main pipe connected to the first spray tower.

[0008] Further, a pressure gauge is arranged on the first main pipe between the first pump and the first spray tower, and the pressure gauge is used to detect the pressure in the first main pipe in real time.

[0009] Further, a pressure relief pipe is connected at one end to the first main pipe between the first pump and the first spray tower and at the other end to the acid storage tank, and a pressure relief valve is arranged on the pressure relief pipe.

[0010] Further, the pressure relief valve is a manual valve.

[0011] Further, the first main pipe is also connected to a second spray tower, and when the ammonia content in the flue gas increases sharply, the acid solution is introduced into the second spray tower through the acid storage tank.

[0012] Further, a second check valve is arranged at the end of the first main pipe connected to the second spray tower.

[0013] Further, an alkali storage tank is arranged, the alkali storage tank stores an alkaline liquid, the alkali storage tank is connected to the second spray tower and a third spray tower through a second main pipe, the alkaline liquid is used to remove acidic gas in the flue gas, when the second spray tower is introduced with the acid solution, the alkaline liquid is not introduced, and when the second spray tower is introduced with the alkaline liquid, the acid solution is not introduced.

[0014] The beneficial effects of the present application are as follows:

[0015] 1. According to the present application, the acid solution can be introduced into the first spray tower according to the excess ammonia generated under special circumstances, the first spray tower is changed from a water washing spray tower to an acid washing spray tower, the acid solution and the ammonia in the flue gas are neutralized to remove the excess ammonia in the flue gas, the introduction of the acid solution into the first spray tower is stopped when the ammonia index is normal, and the first spray tower is changed back to the water washing spray tower, so that the mechanism is flexible and changeable, and the effect is good.

[0016] 2. The spare pipe of the present application can realize online maintenance of the pump without stopping the machine, so that the maintenance process is more convenient and fast, the normal production is not affected, and the production process is ensured to be orderly. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a spray tower system of the prior art.

[0018] Figure 2 It is the structural schematic diagram of the utility model.

[0019] Marked as in the figure:

[0020] 1, first spray tower;2, second spray tower;3, third spray tower;4, fourth spray tower;5, acid storage tank;

[0021] 6, first main pipe;601, first pump;602, first valve;603, first check valve;604, pressure gauge;605, second check valve;

[0022] 7, standby pipe;701, second pump;702, second valve;

[0023] 8, pressure relief pipe;801, pressure relief valve;

[0024] 9, alkali storage tank;10, second main pipe. DETAILED DESCRIPTION

[0025] In the description of the utility model, it needs to be explained that the orientation or position relationship indicated by the terms "front", "upper", "lower", "left", "right", "vertical", "horizontal" and the like is the orientation or position relationship based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and is not indicative or implied that the device or element indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model.

[0026] In the description of the utility model, it needs to be explained that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected;It can be directly connected, or indirectly connected through an intermediate medium, or the communication between two elements inside it. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0027] The following will be combined with the drawings Figure 2 Further illustrate the utility model.

[0028] Embodiment

[0029] In view of the technical problems in the background art, the utility model provides an abnormal ammonia removal device for municipal sludge incineration flue gas.

[0030] In the specific technical scheme, the abnormal ammonia removal device for municipal sludge incineration flue gas comprises a first spray tower 1, a second spray tower 2, a third spray tower 3 and a fourth spray tower 4 for the flue gas to flow through in sequence, and further comprises an alkali storage tank 9, wherein the alkali storage tank 9 stores an alkaline liquid, and the alkali storage tank 9 is connected with the second spray tower 2 and the third spray tower 3 through a second main pipe 10, and the alkaline liquid is used for removing the acid gas in the flue gas.

[0031] The above structure is the same as the spray tower system in the prior art. In a normal case, the ammonia in the flue gas generated after the sludge is combusted in the incinerator is within a reasonable index range after treatment, and the flue gas can be directly discharged into the atmosphere. However, when the combustion in the incinerator is insufficient and the excessive decomposition of nitrogen-containing organic matter occurs, or when the nitrogen oxides are reduced under specific conditions during the incineration process, excessive ammonia will be generated in these cases, which will affect the air quality and the life of the surrounding residents if discharged into the atmosphere.

[0032] In view of the above problems, the utility model makes the following improvements: Figure 2 The embodiment further comprises an acid storage tank 5, wherein the acid storage tank 5 stores an acidic liquid, the acid storage tank 5 is connected with the first spray tower 1 through a first main pipe 6, the first main pipe 6 is provided with a first pump 601 for providing power, and the first main pipe 6 at both ends of the first pump 601 is provided with a first valve 602. The acidic liquid is a 3.735 mol / L sulfuric acid solution.

[0033] It is worth noting that the first spray tower 1 is originally a water washing spray tower, which becomes an acid washing spray tower after the acidic liquid is introduced. In addition, the acid storage tank 5 in the present application does not continuously inject the acidic liquid into the first spray tower 1, but intervenes when the ammonia content in the flue gas increases due to the above-mentioned special conditions. Specifically, it is judged by detecting ammonia. The flue in the production system is provided with an online flue gas detection device, and the device displays the ammonia index. Once the ammonia index in the flue gas is greater than the threshold value, the acid storage tank 5 introduces the acidic solution into the first spray tower 1; when the ammonia index in the flue gas is less than the threshold value, the acid storage tank 5 stops introducing the acidic solution into the first spray tower 1.

[0034] When the ammonia is excessive, the reaction equation is: 2NH3+H2SO4=2 (NH4)2SO4;

[0035] When the ammonia is small, the reaction equation is: NH3+H2SO4=NH4HSO4.

[0036] Through the above structure and working principle, the application can according to the excess ammonia gas generated under special circumstances, the acid liquid is introduced into the first spray tower, the first spray tower is changed from the water washing spray tower to the acid washing spray tower, the neutralization reaction between the acid liquid and the ammonia gas in the flue gas is generated, so that the excess ammonia gas in the flue gas is removed, when the ammonia gas index is normal, the acid liquid is stopped to be introduced into the first spray tower, the first spray tower is changed back to the water washing spray tower, the mechanism is flexible and changeable, and the effect is good.

[0037] In order to realize the on-line maintenance of the first pump and improve the service life of the first pump, with reference to Figure 2 Therefore, the embodiment also provides a standby pipe 7, one end of the standby pipe 7 is connected to the first main pipe 6 between the first pump 601 and the first spray tower 1, the other end of the standby pipe 7 is connected to the first main pipe 6 between the first pump 601 and the acid storage tank 5, a second pump 701 is arranged on the standby pipe 7, second valves 702 are arranged on the standby pipe 7 at two ends of the second pump 701, and the first pump 601 and the second pump 701 are used alternately.

[0038] From the above structure, it can be known that the acid liquid in the acid storage tank 5 can be delivered to the first spray tower 1 through two pipes, in a normal state, one standby pipe is used, when a pump fails or needs to be maintained, another pipe is used for delivery, so that the on-line maintenance of the pump can be realized, and in normal cases, the two delivery pumps can also be used alternately, so as to protect the pump and effectively improve the service life of the delivery pump.

[0039] In order to avoid the backflow phenomenon, the embodiment also provides a first check valve 603 arranged at one end of the first main pipe 6 connected to the first spray tower 1.

[0040] In order to avoid the damage of the pressure in the pipe to the pipe and the equipment, with reference to Figure 2 Therefore, the embodiment also provides a pressure relief pipe 8, one end of the pressure relief pipe 8 is connected to the first main pipe 6 between the first pump 601 and the first spray tower 1, the other end of the pressure relief pipe 8 is communicated with the acid storage tank 5, a pressure relief valve 801 is arranged on the pressure relief pipe 8, the pressure relief valve 801 is a manual valve, a pressure gauge 604 is arranged on the first main pipe 6 between the first pump 601 and the first spray tower 1, and the pressure gauge 604 is used for detecting the pressure in the first main pipe 6 in real time.

[0041] Because the power of the pump is certain, if the amount of the acidic liquid required by the first spray tower is small, the first valve 602 on the first main pipe 6 needs to be adjusted to a smaller position, at this time, the flow of the acidic liquid in the first main pipe 6 is small, and the power of the pump is unchanged, which will cause the pressure in the pipe to become larger and larger, and finally lead to the situation of pipe burst or pump damage, therefore, in order to avoid the above situation, the embodiment sets the pressure relief pipe 8. When the pressure in the first main pipe is large, that is, the amount of the acidic liquid required by the first spray tower 1 is small, the pressure relief valve 801 is opened, at this time, part of the acidic liquid flows back to the acid storage tank 5 through the pressure relief pipe 8, thereby reducing the pressure in the first main pipe 6, thereby avoiding the situation of pipe burst or urea pump damage.

[0042] In order to further improve the treatment efficiency of ammonia gas, with reference to Figure 2 The first main pipe 6 is also connected with the second spray tower 2.

[0043] When the content of ammonia gas in the flue gas increases sharply under special circumstances, the first spray tower 1 cannot process the ammonia gas in the flue gas, the acidic solution is introduced into the second spray tower 2 through the acid storage tank 5, and the second spray tower is changed into an acid washing spray tower.

[0044] It is worth noting that when the second spray tower 2 is introduced with the acidic liquid, the alkaline liquid is no longer introduced; when the second spray tower 2 is introduced with the alkaline liquid, the acidic liquid is no longer introduced.

[0045] The above specific embodiments further illustrate the purpose, technical scheme and beneficial effects of the utility model, and it should be understood that the above description is only a specific embodiment of the utility model, and is not used to limit the protection scope of the utility model, any modification, equivalent replacement, improvement, etc. within the spirit and principles of the utility model should be included in the protection scope of the utility model.

Claims

1. An abnormal ammonia removal device for municipal sludge incineration flue gas, comprising a first spray tower (1), a second spray tower (2), a third spray tower (3) and a fourth spray tower (4) for the flue gas to flow through in turn, characterized in that, The acid storage tank (5) is connected with the first spray tower (1) through a first main pipe (6), and a first pump (601) for providing power is arranged on the first main pipe (6). When the ammonia index in the flue gas is greater than a threshold value, the acid storage tank (5) is used to introduce an acidic solution into the first spray tower (1). When the ammonia index in the flue gas is less than a threshold value, the acid storage tank (5) stops introducing the acidic solution into the first spray tower (1).

2. The abnormal ammonia removal device for municipal sludge incineration flue gas according to claim 1, characterized by, The standby pipe (7) is connected between the first pump (601) and the first spray tower (1) on the first main pipe (6) and between the first pump (601) and the acid storage tank (5) on the first main pipe (6), and a second pump (701) is arranged on the standby pipe (7), and second valves (702) are arranged on the standby pipe (7) at both ends of the second pump (701), and the first pump (601) and the second pump (701) are used alternately.

3. The abnormal ammonia removal device for municipal sludge incineration flue gas according to claim 1, characterized by, The first main pipe (6) is provided with a first check valve (603) at one end connected with the first spray tower (1).

4. The abnormal ammonia removal device for municipal sludge incineration flue gas according to claim 1, characterized by, A pressure gauge (604) is arranged on the first main pipe (6) between the first pump (601) and the first spray tower (1), and the pressure gauge (604) is used to detect the pressure in the first main pipe (6) in real time.

5. The abnormal ammonia removal device for municipal sludge incineration flue gas according to claim 4, characterized by, The pressure relief pipe (8) is connected between the first pump (601) and the first spray tower (1) on the first main pipe (6) and is in communication with the acid storage tank (5), and a pressure relief valve (801) is arranged on the pressure relief pipe (8).

6. The abnormal ammonia removal device for municipal sludge incineration flue gas according to claim 5, characterized by, The pressure relief valve (801) is a manual valve.

7. The abnormal ammonia removal device for municipal sludge incineration flue gas according to claim 1, characterized by, The first main pipe (6) is also connected with the second spray tower (2). When the ammonia content in the flue gas increases sharply, the acid storage tank (5) is used to introduce an acidic solution into the second spray tower (2).

8. The abnormal ammonia removal device for municipal sludge incineration flue gas according to claim 7, characterized by, The first main pipe (6) is provided with a second check valve (605) at one end connected with the second spray tower (2).

9. The abnormal ammonia removal device for municipal sludge incineration flue gas according to claim 7, characterized by, The alkali storage tank (9) is connected with the second spray tower (2) and the third spray tower (3) through a second main pipe (10), and the alkali storage tank (9) stores an alkaline liquid, and the alkaline liquid is used to remove acidic gas in the flue gas. When the second spray tower (2) is introduced with the acidic solution, the alkaline liquid is not introduced any more; when the second spray tower (2) is introduced with the alkaline liquid, the acidic solution is not introduced any more.

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