CN217604122U - Novel organic gas explosion-proof safety detection system - Google Patents
Novel organic gas explosion-proof safety detection system Download PDFInfo
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- CN217604122U CN217604122U CN202221438386.0U CN202221438386U CN217604122U CN 217604122 U CN217604122 U CN 217604122U CN 202221438386 U CN202221438386 U CN 202221438386U CN 217604122 U CN217604122 U CN 217604122U
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Abstract
The utility model discloses a novel organic gas explosion-proof safety detection system, which comprises an air inlet pipeline, a pre-combustion unit, a three-way valve, a waste gas purification unit and an emergency treatment unit; the emergency processing unit comprises an emergency discharge pipeline; the inlet pipeline is connected with the inlet of the three-way valve, the first outlet of the three-way valve is connected with the waste gas purification unit, and the second outlet of the three-way valve is connected with the emergency discharge pipeline; the pre-combustion system comprises a pre-combustion air inlet pipeline, a sampling pump and a pre-combustion chamber; the precombustion chamber is a heatable pressure vessel; an air inlet of the precombustion chamber is communicated with an air inlet pipeline through a precombustion air inlet pipeline, and the communication position of the precombustion air inlet pipeline and the air inlet pipeline is positioned in front of the three-way valve according to the flowing direction of waste gas; the sampling pump is arranged on the pre-combustion air inlet pipeline. The utility model has the advantages of fast response speed, low system energy consumption, intrinsically safe and the like.
Description
Technical Field
The utility model belongs to the exhaust-gas treatment field relates to a waste gas purification system, especially relates to a novel explosion-proof safety inspection system of organic gas.
Background
VOCs as PM 2.5 And O 3 Has become an important restriction factor for improving the air quality. According to statistics, accidents caused by burning and exploding of organic gas account for more than 40% of the total number of accidents in key industries such as medicine and petrochemical industry. The safety of VOCs treatment has become the significant problem that restricts the development of related industries, and the explosion accident of organic waste gas treatment devices happens occasionally, and the existing explosion-proof safety detection system is difficult to ensure the complete safe operation.
Regenerative combustion and regenerative catalytic combustion are one of the most widely used and most effective technologies in the field of VOCs treatment, and because of the high-temperature combustion, the safety of the regenerative catalytic combustion is always a difficult point to be broken through in VOCs treatment, and the conventional method is to ensure that the peak inlet gas concentration is lower than 25 percent LEL. At present, the most common means is to adopt detecting instruments such as PID, FID, FAT, LEL and the like to monitor the concentration of the waste gas inlet, and when the concentration of the waste gas is too high, measures such as dilution, buffering and the like are adopted to avoid the generation of combustion and explosion accidents. The accuracy and stability of detecting the concentration of the VOCs are crucial, but the types of the VOCs waste gas are complex, particularly in the industries of medicine, chemical engineering and the like, the VOCs components are complex and the concentration fluctuation is large, the difference of response factors of an instrument with a single detection principle to different substances is large, and the detection instrument does not respond to partial substances or responds too high to certain substances and the like to cause system misjudgment. The detected concentration is higher than the actual concentration, the concentration of the waste gas is too low due to excessive dilution, the combustion device cannot maintain self-heating combustion, a large amount of fossil fuels such as natural gas and the like need to be additionally supplemented, and the energy consumption is high; the detection concentration is lower than the actual concentration, and the system safety cannot be ensured.
The essential reason for the explosion of the waste gas combustion device is that when the concentration of VOCs is too high (reaching the lower explosion limit), VOCs are decomposed in the combustion chamber to release a large amount of heat, so that the temperature and the pressure of the system are increased rapidly, and further explosion accidents are caused.
SUMMERY OF THE UTILITY MODEL
The utility model provides a novel organic gas explosion-proof safety detection system and application method thereof to overcome prior art's defect.
In order to achieve the above object, the utility model provides a novel explosion-proof safety inspection system of organic gas has such characteristic: the system comprises an air inlet pipeline, a pre-combustion unit, a three-way valve, a waste gas purification unit and an emergency treatment unit; the emergency processing unit comprises an emergency discharge pipeline; the inlet pipeline is connected with the inlet of the three-way valve, the first outlet of the three-way valve is connected with the waste gas purification unit, and the second outlet of the three-way valve is connected with the emergency discharge pipeline; the pre-combustion system comprises a pre-combustion air inlet pipeline, a sampling pump and a pre-combustion chamber; the precombustion chamber is a heatable pressure vessel; the air inlet of the precombustion chamber is communicated with an air inlet pipeline through a precombustion air inlet pipeline, and the communication position of the precombustion air inlet pipeline and the air inlet pipeline is positioned in front of the three-way valve according to the flowing direction of waste gas; the sampling pump is arranged on the precombustion air inlet pipeline.
Further, the utility model provides a novel explosion-proof safety inspection system of organic gas can also have such characteristic: wherein the prechamber is provided with a pressure sensor and a temperature sensor.
Further, the utility model provides a novel explosion-proof safety inspection system of organic gas can also have such characteristic: the pre-combustion system further comprises an air inlet one-way valve and a pre-combustion unit flame arrester which are arranged on the pre-combustion air inlet pipeline.
Further, the utility model provides a novel explosion-proof safety inspection system of organic gas can also have such characteristic: the pre-combustion chamber sequentially comprises an outer box body, a heat insulation layer and an inner box body from outside to inside, and an electric heater is arranged between the heat insulation layer and the inner box body; and the prechamber is equipped with a safety valve and a rupture disc.
Further, the utility model provides a novel explosion-proof safety inspection system of organic gas can also have such characteristic: the pre-combustion system further comprises a pre-combustion exhaust pipeline connected with the air outlet of the pre-combustion chamber, and an exhaust check valve is arranged on the pre-combustion exhaust pipeline.
Further, the utility model provides a novel explosion-proof safety inspection system of organic gas can also have such characteristic: wherein the precombustion system further comprises a mass flow meter arranged on the precombustion air inlet pipeline.
Further, the utility model provides a novel explosion-proof safety inspection system of organic gas can also have such characteristic: wherein, the emergency treatment unit further comprises an emergency fan arranged on the emergency discharge pipeline.
Further, the utility model provides a novel explosion-proof safety inspection system of organic gas can also have such characteristic: wherein the exhaust gas purification unit comprises a purification pipeline, an exhaust gas treatment device and a purification exhaust pipeline; an air inlet of the waste gas treatment equipment is communicated with a first outlet of the three-way valve through a purification pipeline; the gas outlet of the waste gas treatment equipment is communicated with the emergency discharge pipeline through a purification exhaust pipeline; the waste gas treatment equipment is RTO equipment or RCO equipment.
Further, the utility model provides a novel explosion-proof safety inspection system of organic gas can also have such characteristic: wherein, the waste gas purification unit still includes main fan and the purification unit spark arrester of setting on purifying line.
Further, the utility model provides a novel explosion-proof safety inspection system of organic gas can also have such characteristic: the pre-processor is arranged on the air inlet pipeline and is positioned in front of the pre-combustion air inlet pipeline according to the flowing direction of the waste gas.
The beneficial effects of the utility model reside in that: the utility model provides a novel explosion-proof safety inspection system of organic gas and application method thereof judges the risk of VOCs explosion through the change of control VOCs incineration process temperature and pressure. Specifically, the utility model discloses an extract a little share waste gas and burn in advance, through the change of monitoring temperature and pressure in the precombustion chamber, can whether have the burning and explode the risk by accurate prediction waste gas in exhaust-gas treatment equipment (RTO equipment or RCO equipment), possess the characteristics of safe nature, fundamentally avoids because the burning that concentration monitoring concentration brought is on the low side explodes the risk. Meanwhile, the problem of energy waste caused by overhigh detection concentration is solved.
The utility model discloses a burn unit replacement waste gas online concentration monitoring instrument in advance, whether the waste gas that can accurate prediction get into exhaust-gas treatment equipment (RTO equipment or RCO equipment) has the explosion risk, avoided simultaneously because the online monitoring instrument leads to the energy waste that actual measurement concentration brought when far above actual concentration to different pollutant component response factor's difference. In the prior art, in order to ensure the system safety, a concentration detection instrument usually adopts 25% Lower Explosion Limit (LEL) as a concentration control point, and the system can be operated when the LEL is higher than 25%, namely when the concentration of the waste gas is higher than 25% lower explosion limit and is lower than the lower explosion limit without explosion risk, the waste gas can also ensure the system safety without hedging and diluting, and the energy waste caused by reducing the concentration of the waste gas by hedging and diluting is further reduced.
The precombustion chamber adopts pressure vessel, sets up relief valve and rupture disk, can deal with the burning of burning many times of burning of precombustion gas and explode, and air inlet check valve and precombustion unit spark arrester etc. can separate precombustion chamber and waste gas air inlet pipe way completely, prevent the influence of the waste gas that has already burnt and exploded to main system.
The utility model has the characteristics of response speed is fast, the system energy consumption is low, essence is safe.
Drawings
FIG. 1 is a schematic diagram of a novel organic gas explosion-proof safety detection system;
FIG. 2 is a graph of exhaust gas pressure/temperature versus concentration in the prechamber.
Detailed Description
The following describes embodiments of the present invention with reference to the drawings.
As shown in figure 1, the utility model provides a novel explosion-proof safety inspection system of organic gas, including air inlet pipeline 1, precombustion unit, three-way valve 3, exhaust purification unit and emergency treatment unit.
The inlet pipe 1 is connected with the inlet of the three-way valve 3, the first outlet of the three-way valve 3 is connected with the waste gas purification unit, and the second outlet of the three-way valve 3 is connected with the emergency treatment unit.
The exhaust gas purification unit comprises a purification line 41, an exhaust gas treatment device 42 and a purification exhaust line 43. The intake port of the exhaust gas treatment device 42 communicates with the first outlet of the three-way valve 3 through the purge line 41. The outlet of the exhaust gas treatment device 42 communicates with an emergency discharge line 51 via a purge exhaust line 43. The exhaust gas treatment device 42 is an RTO device or an RCO device.
In a preferred embodiment, the exhaust gas purification unit further comprises a main fan 44 and a purification unit flame arrester 45 arranged on the purification line 41.
The emergency treatment unit comprises an emergency discharge line 51 connected to the second outlet of the three-way valve 3, and an emergency fan 52 arranged on the emergency discharge line 51.
The pre-combustion system comprises a pre-combustion intake conduit 21, a sampling pump 22 and a pre-combustion chamber 23. The precombustion chamber 23 is a heatable pressure vessel, and comprises an outer box body, a heat-insulating layer and an inner box body from outside to inside in sequence, and an electric heater is arranged between the heat-insulating layer and the inner box body. The air inlet of the precombustion chamber 23 is communicated with the air inlet pipeline 1 through the precombustion air inlet pipeline 21, and the communication position of the precombustion air inlet pipeline 21 and the air inlet pipeline 1 is positioned in front of the three-way valve 3 according to the flowing direction of waste gas. The sampling pump 22 is provided on the precombustion intake pipe 21.
The pre-combustion system further comprises a pre-combustion exhaust pipeline 28 connected with the air outlet of the pre-combustion chamber 23, and an exhaust check valve is arranged on the pre-combustion exhaust pipeline 28.
The prechamber 23 is provided with a pressure sensor 24 and a temperature sensor 25, which detect the pressure and temperature in the prechamber 23.
When the exhaust gas treatment device 42 is an RTO device, the temperature in the precombustion chamber 23 is controlled to 760 to 850 ℃. When the exhaust gas treatment device 42 is an RCO device, the temperature in the precombustion chamber 23 is controlled to 300 to 450 ℃.
In a preferred embodiment, the pre-combustion system further comprises an intake check valve 26 and a pre-combustion unit flame arrester 27 arranged on the pre-combustion intake duct 21. The prechamber 23 is equipped with a safety valve and a rupture disk. When the pressure exceeds 1/4, 1/3 or 1/2 (preferably 1/2) of the highest bearable pressure of the inner box body, the safety valve is opened to release the pressure, and the sampling pump 22 and the air inlet one-way valve 26 are closed, so that the impact of the explosion of the waste gas in the precombustion chamber 23 on the waste gas purification unit is prevented. When the pressure exceeds 2/3 of the pressure of the inner box body, the rupture disk explodes to release pressure, the rupture disk can realize quick pressure release, and the system safety is further improved.
In a preferred embodiment, the pre-combustion system further comprises a mass flow meter arranged on the pre-combustion intake conduit 21, detecting the sampled flow 29.
The system further comprises a pre-processor 6 arranged in the inlet line 1, the pre-processor 6 being located before the pre-combustion inlet line 21 in the direction of flow of the exhaust gases. The preprocessor 6 performs a process before combustion, such as filtration, on the exhaust gas.
The use method of the novel organic gas explosion-proof safety detection system comprises the following steps: waste gas enters the system through an air inlet pipeline 1 and enters a waste gas purification unit through a three-way valve 3 for treatment. Before the waste gas enters the waste gas purification unit for treatment, the sampling pump 22 extracts airflow with a fixed flow rate from the waste gas, controls the air flow through the mass flow meter, and enters the box body in the precombustion chamber 23 for combustion. The exhaust gas is combusted in the pre-chamber 23 and the temperature and pressure of the housing in the pre-chamber 23 are varied in a manner related to the nature and concentration of the combustible components in the exhaust gas. Specifically, when the concentration of the exhaust gas is lower than the explosion limit, the temperature and pressure change little with the concentration of the exhaust gas, and when the exhaust gas reaches the explosion limit, the temperature and pressure change sharply, as shown in fig. 2, the concentration of combustible gas in the exhaust gas at point a is 0, the point C is close to the explosion limit of the combustible gas, when the concentration of the exhaust gas is at point B between point a and point C, the exhaust gas purification system is in a relatively safe state, and when the concentration of the exhaust gas is at point D, the concentration of the exhaust gas is higher than the explosion limit, and the exhaust gas purification system has the risk of explosion. When the temperature and the pressure in the precombustion chamber 23 are changed sharply (the pressure increase rate exceeds 1-10 MPa/s), the three-way valve 3 is switched emergently, and the exhaust gas is discharged safely through the emergency discharge pipeline 51.
The pressure sensor 24 and the temperature sensor 25 are interlocked with the three-way valve 3, the sampling pump 22 and the air inlet one-way valve 26, the sampling, reaction and interlocking control response time is 1-3 s, and the exhaust gas with the pipeline length from the pre-combustion unit to the three-way valve 3 meeting the explosion risk is switched to an emergency treatment unit before entering the exhaust gas purification unit.
When the components of the exhaust gas are determined, the pressure change condition of the exhaust gas with different concentrations entering the precombustion chamber 23 is obtained through experiments, a pressure value lower than the pressure before the sharp change (namely, the point C) is directly set as an emergency discharge pressure, and when the pressure of the exhaust gas in the precombustion chamber 23 reaches the emergency discharge pressure, the three-way valve 3 is switched emergently to enable the exhaust gas to be discharged safely through the emergency discharge pipeline 51. This compositional approach may reduce the detonation of the exhaust within prechamber 23, increasing the service life of prechamber 23.
Claims (10)
1. The utility model provides a novel explosion-proof safety inspection system of organic gas which characterized in that:
the system comprises an air inlet pipeline, a pre-combustion unit, a three-way valve, a waste gas purification unit and an emergency treatment unit;
the emergency processing unit comprises an emergency discharge pipeline;
the inlet pipeline is connected with the inlet of the three-way valve, the first outlet of the three-way valve is connected with the waste gas purification unit, and the second outlet of the three-way valve is connected with the emergency discharge pipeline;
the pre-combustion system comprises a pre-combustion air inlet pipeline, a sampling pump and a pre-combustion chamber;
the precombustion chamber is a heatable pressure vessel; an air inlet of the precombustion chamber is communicated with an air inlet pipeline through a precombustion air inlet pipeline, and the communication position of the precombustion air inlet pipeline and the air inlet pipeline is positioned in front of the three-way valve according to the flowing direction of waste gas;
the sampling pump is arranged on the precombustion air inlet pipeline.
2. The novel organic gas explosion-proof safety detection system according to claim 1, characterized in that:
wherein the prechamber is provided with a pressure sensor and a temperature sensor.
3. The novel organic gas explosion-proof safety detection system according to claim 1, characterized in that:
the pre-combustion system further comprises an air inlet one-way valve and a pre-combustion unit flame arrester, wherein the air inlet one-way valve and the pre-combustion unit flame arrester are arranged on the pre-combustion air inlet pipeline.
4. The novel organic gas explosion-proof safety detection system according to claim 1, characterized in that:
the pre-combustion chamber sequentially comprises an outer box body, a heat insulation layer and an inner box body from outside to inside, and an electric heater is arranged between the heat insulation layer and the inner box body; and the prechamber is equipped with a safety valve and a rupture disc.
5. The novel organic gas explosion-proof safety detection system according to claim 1, characterized in that:
the pre-combustion system further comprises a pre-combustion exhaust pipeline connected with the air outlet of the pre-combustion chamber, and an exhaust check valve is arranged on the pre-combustion exhaust pipeline.
6. The novel organic gas explosion-proof safety detection system according to claim 1, characterized in that:
wherein, the precombustion system still includes the mass flowmeter who sets up on precombustion air intake pipe.
7. The novel organic gas explosion-proof safety detection system according to claim 1, characterized in that:
wherein, the emergency treatment unit further comprises an emergency fan arranged on the emergency discharge pipeline.
8. The novel organic gas explosion-proof safety detection system according to claim 1, characterized in that:
wherein the exhaust gas purification unit comprises a purification pipeline, an exhaust gas treatment device and a purification exhaust pipeline;
an air inlet of the waste gas treatment equipment is communicated with a first outlet of the three-way valve through a purification pipeline; the gas outlet of the waste gas treatment equipment is communicated with the emergency discharge pipeline through a purification exhaust pipeline;
the waste gas treatment equipment is RTO equipment or RCO equipment.
9. The novel organic gas explosion-proof safety detection system according to claim 8, characterized in that:
wherein, the waste gas purification unit still includes main fan and the purification unit spark arrester of setting on purifying line.
10. The novel organic gas explosion-proof safety detection system according to claim 1, characterized in that:
the pre-processor is arranged on the air inlet pipeline and is positioned in front of the pre-combustion air inlet pipeline according to the flowing direction of the waste gas.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221438386.0U CN217604122U (en) | 2022-06-10 | 2022-06-10 | Novel organic gas explosion-proof safety detection system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202221438386.0U CN217604122U (en) | 2022-06-10 | 2022-06-10 | Novel organic gas explosion-proof safety detection system |
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| CN217604122U true CN217604122U (en) | 2022-10-18 |
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| CN202221438386.0U Active CN217604122U (en) | 2022-06-10 | 2022-06-10 | Novel organic gas explosion-proof safety detection system |
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