Chemical tail gas treatment and emission device

Abstract

The utility model discloses a chemical tail gas treatment and emission device which comprises a storage tank, a liquid inlet pipe connected with the storage tank, and a gas inlet pipe extending into the storage tank, the bottom of the storage tank is connected with a blow-off pipe, a liquid inlet valve is arranged on the liquid inlet pipe, and a blow-off valve is arranged on the blow-off pipe; the top of the storage tank is connected with an emptying pipe and a spraying pipe, and an outlet of the spraying pipe in the storage tank is connected with a spraying head; a high-level liquid level sensor and a low-level liquid level sensor are arranged on the side wall of the storage tank, the tail end of the air inlet pipe is located below the low-level liquid level sensor in the longitudinal direction, the storage tank below the low-level liquid level sensor is connected with a liquid outlet pipe, the liquid outlet pipe is connected with an inlet of the spraying pipe through a circulating pipe, and a first automatic control pump is arranged on the circulating pipe. The high-level liquid level sensor and the low-level liquid level sensor are both connected with a controller, and the controller is connected with a control system of the first automatic control pump; according to the utility model, the up-to-standard emission of tail gas can be realized, safety accidents such as burning explosion and the like are prevented, the continuous emission of the tail gas can be realized, and the efficiency, safety and environmental protection of chemical production are improved.

Description

Technical Field

[0001] The utility model relates to a chemical tail gas treatment and discharge device, in particular to a treatment and discharge device for hydrogen-containing chemical tail gas. Background Art

[0002] At present, how to treat and discharge the chemical tail gas in the fields of medicine, petrochemical, etc., especially the organic chemical waste gas containing hydrogen, up to the standard and safely has been plaguing the whole industry; if the organic chemical waste gas VOC is directly discharged into the atmosphere, it will pollute the environment; at the same time, the explosion limit range of hydrogen is very wide, and it is required to be directly vented. It is very easy to have the risk of combustion and explosion in the thunderstorm season, which will lead to the reaction system and cause major safety accidents such as explosion; the existing chemical tail gas treatment and discharge device usually uses an inlet pipe to introduce the chemical tail gas into a washing storage tank, and makes an immersive contact with the washing liquid in the tank to remove the organic matter in the tail gas and then discharge it; however, the device has poor removal effect on organic matter, which affects the discharge up to the standard; but for the hydrogen-containing chemical waste gas, usually for safety reasons, it needs to be directly discharged into the atmosphere, and the organic waste gas also enters the atmosphere together, seriously polluting the environment and there are also potential safety hazards such as deflagration. Content of the Utility Model

[0003] The purpose of the utility model is to provide a chemical tail gas treatment and discharge device aiming at the above deficiencies of the prior art. It can not only achieve the discharge of tail gas up to the standard and prevent the occurrence of safety accidents such as combustion and explosion, but also realize the continuous discharge of tail gas, improve the production efficiency and safety and environmental protection.

[0004] In order to achieve the above purpose, a chemical tail gas treatment and discharge device of the utility model includes a storage tank, a liquid inlet pipe connected thereto, and an inlet pipe extending into the storage tank. A sewage discharge pipe is connected to the bottom of the storage tank. A liquid inlet valve is arranged on the liquid inlet pipe, and a sewage discharge valve is arranged on the sewage discharge pipe; its characteristics are that: an emptying pipe and a spray pipe are connected to the top of the storage tank, and a spray head is connected to the outlet of the spray pipe in the storage tank; a high-level liquid level sensor and a low-level liquid level sensor are arranged on the side wall of the storage tank. The end of the inlet pipe is longitudinally located below the low-level liquid level sensor. A liquid outlet pipe is connected to the storage tank below the low-level liquid level sensor. The liquid outlet pipe is connected to the inlet of the spray pipe through a circulation pipe. A first automatic control pump is arranged on the circulation pipe. Both the high-level liquid level sensor and the low-level liquid level sensor are connected to a controller, and the controller is connected to the control system of the first automatic control pump.

[0005] When the utility model is in use: The washing liquid is injected into the storage tank through the liquid inlet pipe. When the high-level liquid level sensor and the low-level liquid level sensor detect that the liquid level is between the two, the first automatic control pump is started to pump the washing liquid into the spray pipe for circulation. During this process, the tail gas is introduced into the washing liquid in the storage tank through the air inlet pipe, and they are in full contact to remove the organic matter in the tail gas. Other insoluble gases overflow from the washing liquid and then are in full contact with the sprayed washing liquid to further dissolve the organic matter in the waste gas sufficiently. The tail gas after two washes has a good removal effect and can achieve up-to-standard discharge through the exhaust pipe;

[0006] As a further improvement of the utility model, the liquid outlet pipe is also connected to the inlet of the spray pipe through a standby circulation pipe, and a second automatic control pump is provided on the standby circulation pipe. The controller is connected to the control system of the second automatic control pump; The automatic control pumps can be used in a one-for-one standby mode, enabling continuous spraying and continuous discharge of the tail gas, thereby improving production efficiency;

[0007] As a further improvement of the utility model, a flame arrester is provided on the exhaust pipe; For tail gas containing hydrogen, it can block the entry of fire sources into the storage tank, prevent the occurrence of safety accidents such as combustion and explosion, and improve safety;

[0008] As a further improvement of the utility model, the top of the storage tank is also connected to the exhaust pipe through an emergency exhaust pipe, and a flame arrester is provided on the emergency exhaust pipe; When the exhaust pipe is blocked or the pressure in the tank exceeds the limit, the emergency exhaust pipe can discharge and ensure safety;

[0009] As a further improvement of the utility model, the liquid inlet valve is an automatic control valve, and the automatic control valve is connected to the controller; It can automatically replenish the washing liquid;

[0010] As a further improvement of the utility model, a temperature sensor and a liquid level gauge are connected to the lower side wall of the storage tank; It can monitor the temperature and liquid level in the tank and improve safety;

[0011] As a further improvement of the utility model, pressure sensors are provided on both the circulation pipe and the standby circulation pipe; It can detect the flow rate of the washing liquid in the pipe and ensure the removal effect;

[0012] In summary, the utility model can not only achieve up-to-standard discharge of the tail gas, prevent the occurrence of safety accidents such as combustion and explosion, but also achieve continuous discharge of the tail gas, improving production efficiency and safety and environmental protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is the front view of the embodiment of the utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0014] The following will further describe the present utility model in detail with reference to the drawings.

[0015] As shown in Figure 1As shown in the figure, a chemical tail gas treatment and emission device of this embodiment includes a storage tank 1, a liquid inlet pipe 2 connected thereto, and an air inlet pipe 3 extending into the storage tank. A sewage discharge pipe is connected to the bottom of the storage tank 1. An automatic control valve 6 is provided on the liquid inlet pipe 2, and a sewage discharge valve 7 is provided on the sewage discharge pipe; an emptying pipe 8 and a spray pipe 9 are connected to the top of the storage tank 1. The top of the storage tank 1 is also connected to the emptying pipe 8 through an emergency emptying pipe 11. Flame arresters 12 are provided on both the emptying pipe 8 and the emergency emptying pipe 11. The outlet of the spray pipe in the storage tank 1 is connected to several spray heads 10 (only one is shown); a high-level liquid level sensor 13 and a low-level liquid level sensor 14 are provided on the side wall of the storage tank. The end of the air inlet pipe 3 is longitudinally located below the low-level liquid level sensor 14. A liquid outlet pipe 15 is connected to the storage tank 1 below the low-level liquid level sensor 14. The liquid outlet pipe 15 is connected to the inlet of the spray pipe 9 through a circulation pipe 16. A first automatic control pump 17 is provided on the circulation pipe 16; the liquid outlet pipe 15 is also connected to the inlet of the spray pipe 9 through a standby circulation pipe 18. A second automatic control pump 19 is provided on the standby circulation pipe 18; pressure sensors 20 are provided on both the circulation pipe 16 and the standby circulation pipe 18; a temperature sensor 21 and a liquid level gauge 22 are connected to the lower side wall of the storage tank 1; both the high-level liquid level sensor 13 and the low-level liquid level sensor 14 are connected to a controller (not shown), and the controller is connected to the control system 23 of the first automatic control pump 17, the control system 24 of the second automatic control pump 19, and the automatic control valve 6.

[0016] Taking the hydrogen-containing chemical tail gas as an example, when the present utility model is in use: the washing liquid is injected into the storage tank 1 through the liquid inlet pipe 2. When the liquid level is detected between the high-level liquid level sensor 13 and the low-level liquid level sensor 14 and a suitable liquid level is maintained, one of the automatic control pumps 17 or 19 is started to pump the washing liquid into the spray pipe 9 and sprayed by the spray heads 10 to realize the circulation of the washing liquid; during this process, at this time, the hydrogen-containing tail gas is introduced into the washing liquid in the storage tank 1 through the air inlet pipe 3 and is in full contact with the washing liquid, removing most of the organic substances in the tail gas. Hydrogen and other insoluble gases overflow from the washing liquid and are in full contact with the sprayed washing liquid again, further fully dissolving the organic substances in the waste gas. The tail gas after two washes has a good removal effect and can achieve up-to-standard emission through the emptying pipe 8; the two automatic control pumps 17 and 19 can be used in a standby mode. When one automatic control pump is under maintenance, continuous spraying and continuous emission of the tail gas can be realized, improving the efficiency of chemical production; the flame arrester 12 can block the entry of fire into the storage tank 1, prevent the occurrence of safety accidents such as combustion and explosion, and improve safety;

[0017] When the rear part of the emptying pipe 8 is blocked or the pressure in the tank exceeds the limit, the emergency emptying pipe 11 can discharge and ensure safety;

[0018] When the liquid level in the tank is relatively low, the controller can open the automatic control valve 6 to realize automatic replenishment of the washing liquid;

[0019] The liquid level in the tank can be manually monitored through the liquid level gauge 22, and the flow rate of the washing liquid in the pipe can be detected through the pressure sensor 20 to ensure the removal effect;

[0020] The above embodiments are described, but it should be understood that the above embodiments are only for the purpose of exemplification and illustration, and are not intended to limit the present utility model to the scope of the described embodiments.

Claims

1. A chemical tail gas treatment and emission device, comprising a storage tank and a connected liquid inlet pipe, an air inlet pipe extending into the storage tank, a sewage pipe connected to the bottom of the storage tank, a liquid inlet valve provided on the liquid inlet pipe, and a sewage valve provided on the sewage pipe; characterized in that: A drain pipe and a spray pipe are connected to the top of the storage tank, and a spray head is connected to the outlet of the spray pipe in the storage tank; a high liquid level sensor and a low liquid level sensor are provided on the side wall of the storage tank, and the end of the air inlet pipe is located below the low liquid level sensor in the longitudinal direction. A liquid outlet pipe is connected to the storage tank below the low liquid level sensor, and the liquid outlet pipe is connected to the inlet of the spray pipe through a circulation pipe. A first automatic control pump is provided on the circulation pipe. The high liquid level sensor and the low liquid level sensor are both connected to a controller, and the controller is connected to the control system of the first automatic control pump.

2. A chemical tail gas treatment and emission device according to claim 1, characterized in that: The liquid outlet pipe is also connected to the inlet of the spray pipe through a spare circulation pipe, a second automatic control pump is arranged on the spare circulation pipe, and the controller is connected to the control system of the second automatic control pump.

3. A chemical tail gas treatment and emission device according to claim 1 or 2, characterized in that: The exhaust pipe is provided with a flame arrester.

4. A chemical tail gas treatment and emission device according to claim 3, characterized in that: The top of the storage tank is also connected to the drain pipe through an emergency drain pipe, and the emergency drain pipe is equipped with a flame arrester.

5. A chemical tail gas treatment and emission device according to claim 4, characterized in that: The liquid inlet valve is an automatic control valve, which is connected to a controller.

6. A chemical tail gas treatment and emission device according to claim 5, characterized in that: The lower side wall of the tank is connected with a temperature sensor and a liquid level gauge.

7. A chemical tail gas treatment and emission device according to claim 6, characterized in that: Pressure sensors are installed on both the circulation pipe and the spare circulation pipe.

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