Absorption tower accident spraying device, control system and flue gas treatment system

Abstract

The utility model relates to an absorption tower accident spraying device, a control system and a flue gas treatment system.The absorption tower accident spraying device is used for being connected with an inlet flue of an absorption tower and comprises a water tank; the spraying pipeline comprises a first end and a second end, the first end is connected with the water tank, and the second end is used for being connected with the inlet flue; and the air duct is connected with the spraying pipeline so as to blow air into the spraying pipeline, and the outlet pressure of the air duct is larger than the flue gas pressure in the inlet flue. The first end of the spraying pipeline is connected with the water tank, the second end of the spraying pipeline is connected with the inlet flue, the spraying pipeline is used for spraying cooling water into the inlet flue, the air duct is connected to the spraying pipeline and blows air into the spraying pipeline so as to increase the pressure in the spraying pipeline, and the outlet pressure of the air duct is larger than the pressure of flue gas in the inlet flue. And air is blown into the inlet flue from the second end, so that the flue gas is prevented from entering the spraying pipeline to corrode the spraying pipeline.

Description

Technical Field

[0001] The present disclosure relates to the technical field of flue gas treatment, and in particular, to an absorption tower accident spray device, a control system and a flue gas treatment system. Background Art

[0002] When the boiler flue gas temperature rises abnormally or the slurry circulation pump stops operating, the absorption tower emergency spray system is needed to spray the flue gas at the absorption tower inlet. The flue gas can be cooled by spraying water to control the flue gas temperature at the absorption tower inlet within the allowable range, ensuring that the flue gas temperature inside the absorption tower does not exceed the standard and ensuring the safety of the absorption tower.

[0003] However, the existing absorption tower accident spray pipe is directly connected to the absorption tower flue, causing part of the absorption tower inlet flue gas to flow into the spray pipe. Since the absorption tower inlet flue gas contains a large amount of corrosive substances such as sulfide and fluoride, these corrosive flue gases are in contact with the spray pipe for a long time, which will cause corrosion of the spray pipe, greatly affecting the safe and stable operation of the absorption tower accident spray system. Utility Model Content

[0004] The purpose of the present disclosure is to provide an absorption tower emergency spray device, a control system and a flue gas treatment system, which can solve the above-mentioned technical problems.

[0005] In order to achieve the above-mentioned purpose, the present disclosure provides an absorption tower emergency spray device for connecting to the inlet flue of the absorption tower, comprising: a water tank; a spray pipe, comprising a first end and a second end, the first end being connected to the water tank, and the second end being used to connect to the inlet flue; and an air duct connected to the spray pipe to blow air into the spray pipe, and the outlet pressure of the air duct is greater than the flue gas pressure in the inlet flue.

[0006] Optionally, the water tank is used to be arranged above the inlet flue, the first end is connected to the bottom of the water tank, the second end extends in the vertical direction and is used to be connected to the inlet flue, and the absorption tower accident spray device also includes a first control valve, which is arranged on the spray pipe.

[0007] Optionally, the air duct is connected to a portion of the spray pipe between the first control valve and the second end outlet.

[0008] Optionally, the air duct is used to be connected to an oxidation fan.

[0009] Optionally, the absorption tower emergency spray device further includes a second control valve, and the second control valve is arranged on the air duct.

[0010] Optionally, the diameter of the spray pipe is smaller than the diameter of the inlet flue, and the spray pipe further includes a plurality of nozzles, which extend into the inlet flue and are all connected to the second end.

[0011] Optionally, the nozzle is arranged obliquely along the air intake direction of the smoke.

[0012] Optionally, the spray pipe is constructed as a corrosion-resistant spray pipe.

[0013] The second object of the present disclosure is to provide a control system, comprising: the above-mentioned absorption tower emergency spray device; a temperature sensor, arranged in the inlet flue, for detecting the temperature of the flue gas; a first control valve, for controlling the switch of the water tank; a second control valve, for controlling the switch of the air duct; and a controller, for receiving the temperature signal of the temperature sensor and controlling the opening or closing of the first control valve and the second control valve.

[0014] The third object of the present disclosure is to provide a flue gas treatment system, comprising: an absorption tower; an inlet flue connected to the absorption tower; an oxidation fan connected to the absorption tower; and the above-mentioned control system, which is arranged on the inlet flue.

[0015] Through the above technical scheme, in the absorption tower accident spray device provided by the present invention, the first end of the spray pipe is connected to the water tank, and the second end is connected to the inlet flue, which is used to spray cooling water into the inlet flue to reduce the temperature of the flue gas in the inlet flue, so that the flue gas temperature at the inlet of the absorption tower is controlled within an allowable range. The air duct is connected to the spray pipe and blows air into the spray pipe to increase the pressure in the spray pipe, and the outlet pressure of the air duct is greater than the pressure of the flue gas in the inlet flue. The wind blows into the inlet flue from the second end to prevent the flue gas from entering the spray pipe and causing corrosion to the spray pipe.

[0016] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings:

[0018] Figure 1 It is a structural schematic diagram of the accident spraying device of the absorption tower in the present disclosure;

[0019] Figure 2 is a cross-sectional view of an inlet flue in the present disclosure;

[0020] Figure 3 is a system connection diagram of the control system in the present disclosure.

[0021] Description of Reference Numerals

[0022] 1. Absorption tower; 2. Inlet flue; 3. Water tank; 4. Spray pipe; 41. First end; 42. Second end; 43. Nozzle; 5. Air duct; 6. Oxidation fan; 7. First control valve; 8. Second control valve; 9. Temperature sensor; 10. Controller. DETAILED DESCRIPTION

[0023] The specific implementation of the present disclosure is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present disclosure, and is not used to limit the present disclosure.

[0024] In the present disclosure, unless otherwise stated, the directional words used, such as "upper, lower, top, and bottom", generally refer to the upper, lower, top, and bottom of the corresponding component in the direction of gravity when in use, and "inside and outside" refer to the inside and outside relative to the outline of the component or structure itself. In addition, it should be noted that the terms used, such as "first, second, and third", etc., are used to distinguish one element from another, and do not have order and importance. In addition, in the description with reference to the drawings, the same mark in different drawings represents the same element.

[0025] like Figure 1 As shown, the present disclosure provides an absorption tower accident spray device, which is used to be connected to the inlet flue 2 of the absorption tower 1, including: a water tank 3; a spray pipe 4, including a first end 41 and a second end 42, the first end 41 is connected to the water tank 3, and the second end 42 is used to be connected to the inlet flue 2; and an air duct 5, which is connected to the spray pipe 4 to blow air into the spray pipe 4, and the outlet pressure of the air duct 5 is greater than the flue gas pressure in the inlet flue 2.

[0026] Through the above technical scheme, in the absorption tower accident spraying device provided by the present invention, the first end 41 of the spray pipe 4 is connected to the water tank 3, and the second end 42 is connected to the inlet flue 2, which is used to spray cooling water into the inlet flue 2 to reduce the temperature of the flue gas in the inlet flue 2, so that the flue gas temperature at the inlet of the absorption tower 1 is controlled within an allowable range, and the air duct 5 is connected to the spray pipe 4 and blows air into the spray pipe 4 to increase the pressure in the spray pipe 4, and the outlet pressure of the air duct 5 is greater than the pressure of the flue gas in the inlet flue 2, and the wind blows into the inlet flue 2 from the second end 42 to prevent the flue gas from entering the spray pipe 4 and causing corrosion to the spray pipe 4.

[0027] As an optional embodiment, the water tank 3 is used to be arranged above the inlet flue 2, the first end 41 is connected to the bottom of the water tank 3, the second end 42 extends in the vertical direction and is used to be connected to the inlet flue 2, the accident spray device of the absorption tower 1 also includes a first control valve 7, the first control valve 7 is arranged on the spray pipe 4, the water tank 3 is located at a high position, the first end 41 of the spray pipe 4 is connected to the bottom of the water tank 3, to ensure that the cooling water in the water tank 3 is completely discharged under the action of gravity after the first control valve 7 is opened, the second end 42 extends in the vertical direction, to ensure that the cooling water flows out smoothly while ensuring the pressure of the cooling water, the first control valve 7 can control the switch of the water tank 3 and adjust the flow rate.

[0028] Optionally, the air duct 5 is connected to the portion of the spray pipe 4 between the first control valve 7 and the outlet of the second end 42. This arrangement can ensure that wind will not blow into the water tank 3 on the one hand, and on the other hand, the first control valve 7 will not block the air outlet of the spray pipe 4, because the spraying of water by the spray pipe 4 and the blowing of air by the air duct 5 are carried out separately. When the flue gas temperature is normal, the air duct 5 continues to blow air to prevent the smoke from entering the spray pipe 4. When the flue gas temperature is high, the air duct 5 stops blowing air, the first control valve 7 opens, and the spray pipe 4 starts to spray cooling water.

[0029] As an optional embodiment, the air duct 5 is used to be connected to the oxidation fan 6, which is the fan provided by the absorption tower 1. The oxidation fan 6 is used to provide sufficient oxidation air for the slurry in the slurry pool of the absorption tower 1, and is used for oxidizing sulfur in the combustion of straw and coal, oxidizing calcium sulfite into calcium sulfate, thereby achieving the purpose of desulfurization. The present invention adds an air duct 5 connected to the oxidation fan 6 to blow air through the spray pipe 4, and there is no need to set up a separate fan.

[0030] As an optional embodiment, the absorption tower accident spray device also includes a second control valve 8, which is arranged on the air duct 5. The second control valve 8 is used to control the opening and closing of the air duct 5 and control the air outlet of the air duct 5. Of course, a third control valve can also be arranged between the oxidation fan 6 and the absorption tower 1, so that the oxidation fan 6 can supply air to the absorption tower 1 and the air duct 5 separately, or supply air to both at the same time.

[0031] As an optional implementation, Figure 2As shown, the diameter of the spray pipe 4 is smaller than the diameter of the inlet flue 2, and the spray pipe 4 also includes a plurality of nozzles 43, which extend into the inlet flue 2 and are all connected to the second end 42. Because the diameter of the inlet flue 2 is relatively large, in order to fully spray the flue gas, a plurality of nozzles 43 are provided, and the plurality of nozzles 43 are arranged at intervals. At the same time, because the diameter of the spray pipe 4 is relatively small and a plurality of nozzles 43 are provided, although the wind pressure blown out of the air duct 5 is relatively large, the wind volume is relatively small, which will not affect the normal circulation of the flue gas, and prevent the wind blown out of the spray pipe 4 from causing resistance to the flue gas or blowing the flue gas back.

[0032] Optionally, the nozzle 43 is tilted along the air intake direction of the smoke, for example, the tilt angle is 10°-30°, that is, the wind sprayed by the nozzle 43 flows in the same direction as the smoke, also to prevent the wind blown by the spray pipe 4 from affecting the normal circulation of the smoke.

[0033] As an optional embodiment, the spray pipe 4 is constructed as a corrosion-resistant spray pipe to further prevent the spray pipe 4 from being corroded by flue gas. For example, the spray pipe 4 is made of duplex stainless steel. In terms of corrosion resistance, especially under relatively harsh medium environment conditions, the duplex stainless steel has significantly better resistance to pitting corrosion, crevice corrosion, stress corrosion and corrosion fatigue than ordinary austenitic stainless steel, and also has the advantages of high strength, good impact toughness, etc.

[0034] like Figure 3 As shown, the second purpose of the present disclosure is to provide a control system, including: the above-mentioned absorption tower accident spraying device; a temperature sensor 9, which is arranged in the inlet flue 2 and is used to detect the temperature of the flue gas; a first control valve 7, which is used to control the switch of the water tank 3; a second control valve 8, which is used to control the switch of the air duct 5; and a controller 10, which is used to receive the temperature signal of the temperature sensor 9 and control the opening or closing of the first control valve 7 and the second control valve 8. For example, the first control valve 7 and the second control valve 8 are both solenoid valves, and the controller 10 is a single-chip microcomputer. The temperature sensor 9 is used to detect the temperature of the flue gas in the inlet flue 2 and transmit the temperature signal to the controller 10. When the temperature signal received by the controller 10 is higher than the preset temperature, the controller 10 controls the second control valve 8 to close to close the air duct 5, and controls the first control valve 7 to open to open the water tank 3 to spray the flue gas until the flue gas temperature reaches below the preset temperature, thereby realizing automatic control.

[0035] like Figure 1As shown, the third purpose of the present disclosure is to provide a flue gas treatment system, including: an absorption tower 1; an inlet flue 2, connected to the absorption tower 1; an oxidation fan 6, connected to the absorption tower 1; and the above-mentioned control system, which is arranged on the inlet flue 2. The present disclosure is provided with an air duct 5, which is connected to the spray pipe 4 and blows air into the spray pipe 4 to increase the pressure in the spray pipe 4, and the outlet pressure of the air duct 5 is greater than the pressure of the flue gas in the inlet flue 2. The wind blows into the inlet flue 2 from the second end 42 to prevent the flue gas from entering the spray pipe 4 and corroding the spray pipe 4, and the opening and closing of the air duct 5 and the water tank 3 are automatically controlled by the control system.

[0036] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings; however, the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, a variety of simple modifications can be made to the technical solution of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0037] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0038] In addition, various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. An absorption tower emergency spray device, used to be connected to the inlet flue of the absorption tower, characterized in that: include: Water tank; A spray pipe, comprising a first end and a second end, wherein the first end is connected to the water tank, and the second end is used to be connected to the inlet flue; as well as An air duct is connected to the spray pipe to blow air into the spray pipe, and the outlet pressure of the air duct is greater than the smoke pressure in the inlet smoke duct.

2. The absorption tower emergency spray device according to claim 1, characterized in that: The water tank is used to be arranged above the inlet flue, the first end is connected to the bottom of the water tank, the second end extends in the vertical direction and is used to be connected to the inlet flue, and the absorption tower accident spray device also includes a first control valve, which is arranged on the spray pipe.

3. The absorption tower emergency spraying device according to claim 2, characterized in that: The air duct is connected to a portion of the spray pipe between the first control valve and the second end outlet.

4. The absorption tower emergency spraying device according to claim 1, characterized in that: The air duct is used to be connected to the oxidation fan.

5. The absorption tower emergency spray device according to claim 1, characterized in that: The absorption tower emergency spray device also includes a second control valve, which is arranged on the air duct.

6. The absorption tower emergency spray device according to claim 1, characterized in that: The diameter of the spray pipe is smaller than the diameter of the inlet flue. The spray pipe also includes a plurality of nozzles, which extend into the inlet flue and are all connected to the second end.

7. The absorption tower emergency spraying device according to claim 6, characterized in that: The nozzle is arranged obliquely along the air intake direction of the smoke.

8. The absorption tower emergency spray device according to claim 1, characterized in that: The spray pipe is constructed as a corrosion-resistant spray pipe.

9. A control system, characterized in that: include: The absorption tower emergency spray device according to any one of claims 1 to 8; A temperature sensor is arranged in the inlet flue and is used to detect the temperature of the flue gas; A first control valve, used to control the switch of the water tank; A second control valve, used to control the opening and closing of the air duct; as well as The controller is used to receive the temperature signal from the temperature sensor and control the opening or closing of the first control valve and the second control valve.

10. A flue gas treatment system, characterized in that: include: Absorption tower; An inlet flue, connected to the absorption tower; An oxidation fan connected to the absorption tower; as well as The control system as claimed in claim 9 is arranged on the inlet flue.

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