Waste gas dilution pretreatment device for raw pesticide production process

Abstract

The utility model provides a waste gas dilution pretreatment device for a raw pesticide production process. A mixed dilution system is provided with a mixed air header pipe which is communicated with a waste gas induced draft system; a fresh air inlet pipe and an industrial waste gas inlet pipe are arranged at the front part of a dilution air pipe; the waste gas induced draft system comprises a combustible gas concentration detector, an induced draft fan, a flame arrester, an adsorption pipeline and a combustion pipeline, the combustible gas concentration detector, the induced draft fan and the flame arrester are arranged on a mixed air header pipe, the adsorption pipeline and the combustion pipeline are connected with the mixed air header pipe in parallel, the adsorption pipeline is provided with a second switching valve, and the combustion pipeline is provided with a first switching valve; and the combustible gas concentration detector, the first switching valve and the second switching valve are electrically connected with the PLC control center. The device has the beneficial effects that the explosive atmosphere in the waste gas is effectively controlled and maintained in a safe controllable range, so that the safety risk possibly occurring in the tail gas conveying process is obviously reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of waste gas dilution devices, in particular to a waste gas dilution pretreatment device in a pesticide technical production process. Background Art

[0002] Due to its unique properties, the displacement waste gas generated during the synthesis of pesticide technicals requires a specific treatment process to ensure safety and environmental protection. This waste gas is typically nitrogen-sealed and oxygen-free, and the concentration of combustible components exceeds the lower explosion limit. Since the RTO inlet concentration is required to be less than 25% of the lower explosion limit, it must be diluted before being sent to the RTO (Regenerative Thermal Oxidizer) for treatment.

[0003] In existing technologies, oxygen levels are typically controlled below limits at the front end, and combustible component concentrations are controlled below limits in the oxygen-containing section at the back end to ensure safety throughout the entire process. However, in the mixing section, both the oxygen content and the combustible component concentrations may be uncontrolled, creating the risk of an uncontrolled explosive atmosphere. This situation, if left unchecked, could lead to safety accidents. Utility Model Content

[0004] In order to solve the problem that the explosive atmosphere of exhaust gas exceeds the controllable range, causing safety risks in the exhaust gas transportation process;

[0005] The utility model provides a waste gas dilution pretreatment device for a pesticide technical production process, comprising a mixing and dilution system and a waste gas induced draft system, wherein the mixing and dilution system is provided with a mixing air main pipe connected to the waste gas induced draft system;

[0006] The mixing and dilution system includes a dilution air duct, a fresh air inlet pipe and an industrial waste gas inlet pipe are arranged at the front of the dilution air duct, an air mixing port is arranged on the industrial waste gas inlet pipe so that the air intake directions of the fresh air inlet pipe and the industrial waste gas inlet pipe are opposite, and a static mixer is arranged at the rear of the dilution air duct;

[0007] The exhaust gas induced draft system includes a combustible gas concentration detector, an induced draft fan, a flame arrester, and an adsorption pipe and a combustion pipe arranged in parallel with the mixed air main pipe. The adsorption pipe is provided with a second switching valve, and the combustion pipe is provided with a first switching valve. The combustible gas concentration detector, the first switching valve and the second switching valve are electrically connected to the PLC control center.

[0008] As a preferred solution, the fresh air inlet pipe is provided with a fresh air pretreatment system, and the fresh air pretreatment system includes a fresh air filter and a fresh air check valve connected in sequence.

[0009] As a preferred solution, the industrial waste gas inlet pipe is provided with a process waste gas conveying system, which includes a process waste gas fan, an oxygen content analyzer, a process waste gas flame arrester, a shut-off valve and a process waste gas check valve connected in sequence. The oxygen content analyzer is provided with an alarm device, and the shut-off valve is interlocked with the process waste gas fan to start and stop synchronously.

[0010] As a preferred solution, the static mixer is a baffle, and an explosion relief plate is provided on the outside of the mixing and dilution system.

[0011] As a preferred solution, the mixed air main duct is provided with an induced draft fan and a flame arrester.

[0012] As a preferred solution, the alarm threshold of the oxygen content analyzer is an oxygen content higher than 2% to 10%.

[0013] As a preferred solution, the switching threshold of the combustible gas concentration detector is 20% to 25% of the lower explosion limit of the combustible component concentration in the exhaust gas. When it is lower than the threshold, the first switching valve is opened and the second switching valve is closed. When it is higher than the threshold, the first switching valve is closed and the second switching valve is opened.

[0014] The beneficial effects of the utility model are:

[0015] The utility model mixes fresh air with industrial waste gas through a mixing and dilution system. This mixing process is carried out at a specific air mixing port to ensure that the air intake directions of fresh air and industrial waste gas are opposite. At the same time, a static mixer is provided to achieve uniform mixing. The combustible gas concentration detector in the exhaust air induced draft system can monitor the combustible gas concentration in the mixed air main in real time. Once it detects that the concentration exceeds the safety threshold, the system will automatically start the adsorption pipeline to safely dispose of the high-concentration combustible gas. This design helps to reduce the concentration of combustible gas in the exhaust gas and reduce the formation of explosive atmosphere, while also improving the efficiency of exhaust gas treatment. It effectively controls and maintains the explosive atmosphere in the exhaust gas within a safe and controllable range, thereby significantly reducing the safety risks that may occur during the exhaust gas transportation process. This design not only improves the safety of industrial production, but also helps to reduce environmental pollution and improve production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to make the content of the present invention more clearly understood, the present invention is further described in detail below based on specific embodiments and in conjunction with the accompanying drawings, wherein

[0017] Figure 1 It is a structural diagram of the present utility model.

[0018] The reference numerals in the accompanying drawings are:

[0019] 1. Fresh air pretreatment system, 11. Fresh air filter, 12. Fresh air check valve, 2. Mixing and dilution system, 21. Dilution air duct, 22. Air mixing port, 23. Static mixer, 24. Explosion vent, 3. Process exhaust gas conveying system, 31. Process exhaust gas fan, 32. Oxygen content analyzer, 33. Process exhaust gas flame arrester, 34. Shut-off valve, 35. Process exhaust gas check valve, 4. Exhaust air induced draft system, 41. Combustible gas concentration detector, 42. Induced draft fan, 43. Flame arrester, 44. First switching valve, 45. Second switching valve, I. Fresh air inlet pipe, II. Industrial waste gas inlet pipe, III. Adsorption pipe, IV. Combustion pipe, V. Mixing air main. DETAILED DESCRIPTION

[0020] To illustrate the features of the present invention, the present invention will be further described below with reference to the accompanying drawings and embodiments.

[0021] Example:

[0022] See also Figure 1 The embodiment of the utility model provides a waste gas dilution pretreatment device for the production process of pesticide technical, including a fresh air pretreatment system 1, a mixing and dilution system 2, a process waste gas conveying system 3 and a waste gas induced draft system 4. The mixing and dilution system 2 is provided with a mixing air main pipe V connected to the waste gas induced draft system 4, the fresh air inlet pipe I of the mixing and dilution system 2 is provided with the fresh air pretreatment system 1, and the industrial waste gas inlet pipe II of the mixing and dilution system 2 is provided with the process waste gas conveying system 3. The specific technical solutions include:

[0023] The fresh air pretreatment system 1 includes a fresh air filter 11 and a fresh air check valve 12 which are connected in sequence.

[0024] The mixing and dilution system 2 includes a dilution air duct 21. A fresh air inlet pipe I and an industrial waste gas inlet pipe II are arranged in front of the dilution air duct 21. A mixing port 22 is provided on the industrial waste gas inlet pipe II so that the air intake directions of the fresh air inlet pipe I and the industrial waste gas inlet pipe II are opposite. A static mixer 23 is provided at the rear of the dilution air duct 21. In this embodiment, the static mixer 23 is a baffle. An explosion relief plate 24 is provided on the outside of the mixing and dilution system 2.

[0025] The process waste gas conveying system 3 includes a process waste gas fan 31, an oxygen content analyzer 32, a process waste gas flame arrester 33, a shut-off valve 34 and a process waste gas check valve 35 connected in sequence. The oxygen content analyzer 32 is provided with an alarm device, and the shut-off valve 34 is interlocked with the process waste gas fan 31 to start and stop synchronously.

[0026] The exhaust gas induced draft system 4 includes a combustible gas concentration detector 41 installed in the mixed air main pipe V, and an adsorption pipe III (leading to the activated carbon adsorption device) and a combustion pipe IV (leading to the RTO combustion furnace) installed in parallel with the mixed air main pipe V. The adsorption pipe III is provided with a second switching valve 45, and the combustion pipe IV is provided with a first switching valve 44. The combustible gas concentration detector 41, the first switching valve 44 and the second switching valve 45 are electrically connected to the PLC control center.

[0027] For example, the exhaust from a workshop's toluene production process is collected through a closed duct, with a volume of 0-500 m³ / h and a temperature of 30°C. The exhaust is then delivered to the mixing port 22 via the process exhaust gas conveying system. The oxygen content is limited to 5%, and the toluene concentration is 5% v / v (=417% LEL).

[0028] The fresh air is powered by the rear-end induced draft fan, and after particulate matter and dust are removed by the fresh air filter 11, it enters the dilution air duct, mixes with the process exhaust gas discharged from the air mixing port 22, and is fully mixed by the static mixer 23 before being discharged to the mixed air main. In this embodiment, the fresh air volume is 10,000-25,000 m³ / h, and under normal circumstances, the concentration of combustible components is less than 20%LEL. The rated air volume of the fan is 20,000-50,000 m³ / h, and the speed is variable-frequency regulated, with an operating frequency of 20-30 Hz. When the concentration of combustible components increases, the induced draft fan interlock increases the speed and the fresh air volume to maintain the concentration of combustible components less than 20%LEL. When the concentration of combustible components is extremely abnormal and the induced draft fan cannot dilute the exhaust gas to below 20%LEL even at full frequency, the interlock closes the first switching valve to the RTO and simultaneously opens the second switching valve to the emergency activated carbon adsorption box for emergency exhaust gas discharge.

[0029] The above embodiments and accompanying drawings are intended only to illustrate the technical solutions of the present invention and are not intended to limit the present invention. The present invention has been described in detail with reference to preferred embodiments. Those skilled in the art should understand that any changes, modifications, additions, or substitutions made by those skilled in the art within the spirit of the present invention do not depart from the spirit of the present invention and are intended to fall within the scope of the claims of the present invention. Other related technical structures not fully disclosed in this utility model are prior art in the art.

Claims

1. A waste gas dilution pretreatment device for a pesticide technical production process, comprising a mixing and dilution system (2) and a waste gas induced draft system (4), wherein the mixing and dilution system (2) is provided with a mixing air main pipe (V) connected to the waste gas induced draft system (4), and characterized in that: A mixing and dilution system (2) includes a dilution air duct (21), a fresh air inlet pipe (I) and an industrial waste gas inlet pipe (II) are provided at the front of the dilution air duct (21), an air mixing port (22) is provided at the industrial waste gas inlet pipe (II), so that the air intake directions of the fresh air inlet pipe (I) and the industrial waste gas inlet pipe (II) are opposite, and a static mixer (23) is provided at the rear of the dilution air duct (21); The exhaust gas induced draft system (4) comprises a combustible gas concentration detector (41) arranged on a mixed air main pipe (V), an induced draft fan (42), a flame arrester (43), and an adsorption pipe (III) and a combustion pipe (IV) arranged in parallel with the mixed air main pipe (V), wherein the adsorption pipe (III) is provided with a second switching valve (45), and the combustion pipe (IV) is provided with a first switching valve (44), and the combustible gas concentration detector (41), the first switching valve (44), and the second switching valve (45) are electrically connected to a PLC control center.

2. The waste gas dilution pretreatment device for pesticide technical production process according to claim 1, characterized in that: The fresh air inlet pipe (I) is provided with a fresh air pretreatment system (1), and the fresh air pretreatment system (1) comprises a fresh air filter (11) and a fresh air check valve (12) connected in sequence.

3. The waste gas dilution pretreatment device for the pesticide technical production process according to claim 1, characterized in that: The industrial waste gas inlet pipe (II) is provided with a process waste gas delivery system (3), which includes a process waste gas blower (31), an oxygen content analyzer (32), a process waste gas flame arrester (33), a shut-off valve (34) and a process waste gas check valve (35) connected in sequence. The oxygen content analyzer (32) is provided with an alarm device, and the shut-off valve (34) is interlocked with the process waste gas blower (31) to start and stop synchronously.

4. The waste gas dilution pretreatment device for the pesticide technical production process according to claim 1, characterized in that: The static mixer (23) is a baffle, and an explosion relief plate (24) is provided on the outside of the mixing and dilution system (2).

5. The waste gas dilution pretreatment device for the pesticide technical production process according to claim 1, characterized in that: The mixed air main pipe (V) is provided with an induced draft fan (42) and a flame arrester (43).

6. The waste gas dilution pretreatment device for the pesticide technical production process according to claim 3, characterized in that: The alarm threshold of the oxygen content analyzer (32) is an oxygen content higher than 2% to 10%.

7. The waste gas dilution pretreatment device for pesticide technical production process according to claim 1, characterized in that: The switching threshold of the combustible gas concentration detector (41) is 20% to 25% of the lower explosion limit of the combustible component concentration in the exhaust gas. When the concentration is lower than the threshold, the first switching valve (44) is opened and the second switching valve (45) is closed. When the concentration is higher than the threshold, the first switching valve (44) is closed and the second switching valve (45) is opened.

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