CN215892383U - Air distribution system for low-calorific-value waste gas treatment - Google Patents
Air distribution system for low-calorific-value waste gas treatment Download PDFInfo
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- CN215892383U CN215892383U CN202122519268.4U CN202122519268U CN215892383U CN 215892383 U CN215892383 U CN 215892383U CN 202122519268 U CN202122519268 U CN 202122519268U CN 215892383 U CN215892383 U CN 215892383U
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Abstract
The utility model discloses an air distribution system for treating low-heat value waste gas, wherein an air outlet end of an air inlet pipe and an air outlet end of a low-heat value waste gas inlet pipe are respectively in fluid conduction connection with an air inlet end of a gas mixing box, and the air outlet end of the gas mixing box is in fluid conduction connection with an air inlet end of a heat accumulating type incinerator; the air inlet pipe is provided with an air distribution flow meter and an air distribution regulating valve, and the low-calorific-value waste gas inlet pipe is provided with a waste gas flow meter; an online combustible gas concentration detector is arranged on the gas outlet end of the gas mixing box. The utility model mixes the low-heat value waste gas and the air into the mixed gas with the concentration of the combustible gas below 25 percent of the lower explosion limit before entering the heat accumulating type incinerator, ensures the combustion safety in the heat accumulating type incinerator and eliminates hidden troubles.
Description
Technical Field
The utility model relates to the technical field of waste gas treatment, in particular to an air distribution system for treating low-calorific-value waste gas.
Background
The coal chemical industry is an industry with serious waste gas emission and continuously improves with the requirement of environmental protectionThe originally vented low calorific value waste gas must now be treated for emission to reduce atmospheric pollution by VOCs. Low heating value waste gas generally means that the heating value is lower than Q < 6.28MJ/m3The prior art for treating the low-heat value waste gas has a plurality of technologies, and a heat accumulating type oxidation technology is better applied. The heat storage system uses a ceramic heat storage body with high heat capacity, and heat in combustion tail gas is stored in the heat storage body by adopting a direct heat exchange method. The high-temperature heat accumulator directly heats the waste gas to be treated to over 760 ℃, so that VOCs in the waste gas reach respective self-ignition points, and are subjected to oxidation reaction with oxygen in the air to be decomposed into carbon dioxide and water, and simultaneously, reaction heat is released. The reaction heat is stored in a special ceramic heat storage body and is used for heating the organic waste gas entering subsequently so as to continuously carry out the oxidation reaction. The ceramic heat accumulator is generally divided into three (including three) or more zones or chambers, and each heat accumulator chamber is subjected to heat accumulation, heat release, cleaning and other procedures in sequence, and the operation is repeated and continuous.
Although the technology can thoroughly eliminate VOCs and recover heat, certain safety risk exists, and the burning and explosion accidents of the RTO furnace also happen in practice. The reason is that the low heating value exhaust gas mixed with air reaches the explosion limit at high temperature. If the potential safety hazard is eliminated, a large amount of air distribution is needed to keep the mixed gas away from the explosion limit, however, the excessive air distribution not only increases the energy consumption. And the equipment volume is increased, which leads to the corresponding increase of investment and occupied area.
SUMMERY OF THE UTILITY MODEL
In view of the above, the present invention is directed to an air distribution system for treating low-calorific-value waste gas, in which the low-calorific-value waste gas and air are mixed into a mixed gas having a combustible gas concentration of less than 25% of an explosion lower limit before entering a regenerative incinerator, so as to ensure combustion safety in the regenerative incinerator and eliminate hidden troubles.
In order to solve the technical problems, the technical scheme adopted by the utility model is as follows:
the air distribution system for treating the low-heat value waste gas comprises an air inlet pipe, an air outlet end, a low-heat value waste gas inlet pipe, a gas mixing box and a heat accumulating type incinerator, wherein the air outlet end of the air inlet pipe and the gas outlet end of the low-heat value waste gas inlet pipe are respectively in fluid conduction connection with the gas inlet end of the gas mixing box; the air inlet pipe is provided with an air distribution flow meter and an air distribution regulating valve, and the low-calorific-value waste gas inlet pipe is provided with a waste gas flow meter; an online combustible gas concentration detector is arranged on the gas outlet end of the gas mixing box.
According to the air distribution system for treating the low-calorific-value waste gas, the air fan is arranged on the air inlet pipe, and the air distribution flow meter and the air distribution adjusting valve are arranged on the air inlet pipe between the air outlet end of the air fan and the air inlet end of the air mixing box.
In the air distribution system for treating the low-calorific-value waste gas, the air outlet end of the gas mixing box is in fluid conduction connection with the chimney.
According to the air distribution system for treating the low-calorific-value waste gas, the air inlet end of the heat accumulating type incinerator is provided with the emergency stop valve, and the air outlet end of the heat accumulating type incinerator is in fluid conduction connection with the chimney.
The air distribution system for treating the low-calorific-value waste gas is characterized in that an emptying valve is arranged on a gas pipe connecting the gas outlet end of the gas mixing box and the chimney.
In the air distribution system for treating the low-calorific-value waste gas, the air outlet end of the air mixing tank is in fluid communication with the air inlet end of the circulating air pump, and the air outlet end of the circulating air pump is in fluid communication with the air inlet end of the air mixing tank; the online combustible gas concentration detector is arranged on a gas pipe which is connected with the gas outlet end of the gas mixing box and the gas inlet end of the circulating gas pump; the air inlet end of the circulating air pump is provided with a stop valve.
Above-mentioned air distribution system for low heat value waste gas treatment is equipped with the barometer that is used for measuring the inside atmospheric pressure of gas mixing case on the gas mixing case.
The utility model has the following beneficial effects:
the utility model eliminates deflagration by mixing low-heat value waste gas with air before the low-heat value waste gas enters the incinerator and controlling the concentration of combustible gas in the mixed gas to be below 25% of the explosion limit, thereby improving the safety of heat storage incineration type waste gas treatment.
Drawings
The utility model is further illustrated with reference to the following figures and examples.
Fig. 1 is a schematic structural view of an air distribution system for low-calorific-value exhaust gas treatment according to the present invention.
In the figure, 1-air inlet pipe; 2-a low heating value waste gas inlet pipe; 3-air distribution flow meter; 4-air distribution regulating valve; 5-an exhaust gas flow meter; 6-gas mixing box; 7-heat accumulating type incinerator; 8-an online combustible gas concentration detector; 9-a chimney; 10-emergency cut-off valve; 11-a blow-down valve; 12-an air blower; 13-a stop valve; 14-a circulating air pump; 15-barometer.
Detailed Description
In order to more clearly illustrate the utility model, the utility model is further described below with reference to preferred embodiments and the accompanying drawings. Similar parts in the figures are denoted by the same reference numerals. It is to be understood by persons skilled in the art that the following detailed description is illustrative and not restrictive, and is not to be taken as limiting the scope of the utility model.
As shown in fig. 1, in the air distribution system for low-calorific value waste gas treatment of the present invention, the outlet end of an air inlet pipe 1 and the outlet end of a low-calorific value waste gas inlet pipe 2 are respectively in fluid communication with the inlet end of a gas mixing box 6, and the outlet end of the gas mixing box 6 is in fluid communication with the inlet end of a regenerative incinerator 7; an air distribution flowmeter 3 and an air distribution regulating valve 4 are arranged on the air inlet pipe 1, and a waste gas flowmeter 5 is arranged on the low-calorific-value waste gas inlet pipe 2; an online combustible gas concentration detector 8 is arranged on the gas outlet end of the gas mixing box 6.
Wherein, the air inlet pipe 1 is provided with an air fan 12, and the air distribution flow meter 3 and the air distribution regulating valve 4 are arranged on the air inlet pipe 1 between the air outlet end of the air fan 12 and the air inlet end of the air mixing box 6; the air outlet end of the air mixing box 6 is in fluid conduction connection with a chimney 9; an emergency cut-off valve 10 is arranged on the air inlet end of the heat accumulating type incinerator 7, and the air outlet end of the heat accumulating type incinerator 7 is in fluid conduction connection with a chimney 9; an air release valve 11 is arranged on the air delivery pipe connecting the air outlet end of the air mixing box 6 and the chimney 9.
The air outlet end of the air mixing tank 6 is in fluid communication with the air inlet end of the air circulating pump 14, and the air outlet end of the air circulating pump 14 is in fluid communication with the air inlet end of the air mixing tank 6; the online combustible gas concentration detector 8 is arranged on a gas pipe which is connected with the gas outlet end of the gas mixing box 6 and the gas inlet end of the circulating gas pump 14; a stop valve 13 is arranged at the air inlet end of the circulating air pump 14, and an air pressure gauge 15 for measuring the air pressure in the air mixing box 6 is arranged on the air mixing box 6.
In the air distribution system for low-heating-value waste gas treatment in the embodiment, the air flow in the air inlet pipe 1 is adjusted through the air distribution adjusting valve 4 according to a preset scheme by measuring the waste gas flow in the low-heating-value waste gas inlet pipe 2 on line, so that the air quantity is mixed into the low-heating-value waste gas according to a calculated value. The online combustible gas concentration detector 8 can monitor whether the concentration of the combustible gas in the mixed waste gas flowing out from the gas outlet end of the gas mixing box 6 exceeds 25% of the lower explosion limit, if the combustible gas concentration in the mixed exhaust gas exceeds 25% of the lower explosion limit, the quick action emergency valve 10 is closed, meanwhile, the emptying valve 11 is opened to directly discharge the mixed waste gas into the chimney 9 for emptying, so that the mixed waste gas which is possibly exploded is prevented from entering the regenerative incinerator 7, in addition, the stop valve 13 can be opened and the circulating air pump 14 can be started to pump the mixed waste gas into the gas mixing box 6, meanwhile, the air flow is increased to adjust the concentration of the combustible gas in the mixed waste gas, when the concentration of the combustible gas in the mixed waste gas is reduced to meet the requirement, the emergency cut-off valve 10 is opened, at the same time, the air release valve 11 is closed, the circulating air pump 14 and the stop valve 13 are closed, and the mixed waste gas is introduced into the regenerative incinerator 7 for combustion. The air pressure in the air mixing box 6 is monitored by the barometer 15, and the opening size of the air release valve 11 can be adjusted according to the air pressure in the air mixing box 6, so that the direct discharge amount of waste gas is reduced.
Further, the air distribution regulating valve 4, the quick dump valve 10, the blow-off valve 11, the stop valve 13, and the circulation air pump 14 may be controlled by a control room (DCS system). For example, the exhaust gas flow meter 5 transmits the detected exhaust gas flow rate to a control room (DCS system) that adjusts the air distribution regulating valve 4 in accordance with the exhaust gas flow rate; the air distribution flow meter 3 transmits the detected air flow to a control room (DCS system), and the control room adjusts the air distribution adjusting valve 4 according to the air demand; the online combustible gas concentration detector 8 transmits the detected combustible gas concentration to the control room (DCS system), if the combustible gas concentration exceeds 25% of the lower explosion limit, the control room (DCS system) sends a closing control signal to the emergency cut-off valve 10, the emergency cut-off valve 10 is automatically closed, the emptying valve 11 is opened simultaneously, the mixed waste gas is directly discharged into the chimney 9 for emptying, and the mixed waste gas which is likely to generate explosion is prevented from entering the heat accumulating type incinerator 7.
The concentration of combustible gas in the mixed waste gas is controlled in a mode of air distribution in advance, so that the phenomenon that the equipment is damaged due to deflagration of low-heat-value waste gas in the regenerative incinerator 7 can be effectively avoided.
The above examples are given for the purpose of illustrating the utility model clearly and not for the purpose of limiting the same, and it will be apparent to those skilled in the art that, in light of the foregoing description, numerous modifications and variations can be made in the form and details of the embodiments of the utility model described herein, and it is not intended to be exhaustive or to limit the utility model to the precise forms disclosed.
Claims (7)
1. The air distribution system for treating the low-heat-value waste gas is characterized in that an air outlet end of an air inlet pipe (1) and an air outlet end of a low-heat-value waste gas inlet pipe (2) are respectively in fluid conduction connection with an air inlet end of a gas mixing box (6), and an air outlet end of the gas mixing box (6) is in fluid conduction connection with an air inlet end of a heat accumulating type incinerator (7); an air distribution flowmeter (3) and an air distribution regulating valve (4) are arranged on the air inlet pipe (1), and a waste gas flowmeter (5) is arranged on the low-calorific-value waste gas inlet pipe (2); an online combustible gas concentration detector (8) is arranged on the gas outlet end of the gas mixing box (6).
2. The air distribution system for treating the low-heating-value waste gas as recited in claim 1, wherein an air blower (12) is installed on the air inlet pipe (1), and the air distribution flow meter (3) and the air distribution regulating valve (4) are arranged on the air inlet pipe (1) between the air outlet end of the air blower (12) and the air inlet end of the air mixing box (6).
3. The air distribution system for low heating value waste gas treatment according to claim 1, wherein the outlet end of the gas mixing tank (6) is in fluid communication connection with the chimney (9).
4. The air distribution system for low-heating value exhaust gas treatment according to claim 3, wherein an emergency cut-off valve (10) is provided at an air inlet end of the regenerative incinerator (7), and an air outlet end of the regenerative incinerator (7) is in fluid communication with the chimney (9).
5. The air distribution system for treating the low-calorific-value waste gas according to claim 4, wherein an air release valve (11) is arranged on an air conveying pipe connecting the air outlet end of the air mixing tank (6) and the chimney (9).
6. The air distribution system for treating the low-heating-value waste gas according to any one of claims 1 to 5, wherein the air outlet end of the air mixing tank (6) is in fluid communication with the air inlet end of the air circulating pump (14), and the air outlet end of the air circulating pump (14) is in fluid communication with the air inlet end of the air mixing tank (6); the online combustible gas concentration detector (8) is arranged on a gas pipe which is connected with the gas outlet end of the gas mixing box (6) and the gas inlet end of the circulating gas pump (14); a stop valve (13) is arranged on the air inlet end of the circulating air pump (14).
7. The air distribution system for low-heating-value exhaust gas treatment according to claim 6, wherein the gas mixing tank (6) is provided with a barometer (15) for measuring the pressure inside the gas mixing tank (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122519268.4U CN215892383U (en) | 2021-10-19 | 2021-10-19 | Air distribution system for low-calorific-value waste gas treatment |
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| CN202122519268.4U CN215892383U (en) | 2021-10-19 | 2021-10-19 | Air distribution system for low-calorific-value waste gas treatment |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115121145A (en) * | 2022-06-23 | 2022-09-30 | 安徽尘缘节能环保科技有限公司 | High-concentration explosive organic gas thermal oxidation air premixing explosion-proof system |
| CN116351214A (en) * | 2023-03-14 | 2023-06-30 | 山东海美侬环保科技有限公司 | Waste gas pretreatment system and method |
-
2021
- 2021-10-19 CN CN202122519268.4U patent/CN215892383U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115121145A (en) * | 2022-06-23 | 2022-09-30 | 安徽尘缘节能环保科技有限公司 | High-concentration explosive organic gas thermal oxidation air premixing explosion-proof system |
| CN115121145B (en) * | 2022-06-23 | 2023-08-22 | 安徽尘缘节能环保科技有限公司 | High-concentration explosive organic gas thermal oxidation air premixing explosion-proof system |
| CN116351214A (en) * | 2023-03-14 | 2023-06-30 | 山东海美侬环保科技有限公司 | Waste gas pretreatment system and method |
| CN116351214B (en) * | 2023-03-14 | 2024-05-17 | 山东海美侬环保科技有限公司 | Waste gas pretreatment system and method |
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