Purification treatment system for collecting chemical pharmaceutical waste gas and cooperatively reducing pollution and carbon

Abstract

The utility model discloses a purification treatment system for collecting chemical pharmaceutical waste gas and cooperatively reducing pollution and carbon, and belongs to the technical field of organic waste gas collection and purification treatment. The device comprises a waste gas collecting device, a buffer tank, a VOC fan and a VCU incineration device which are sequentially connected, the waste gas collecting device comprises a reaction kettle, a nitrogen-sealed valve and a pressure control unit, the nitrogen-sealed valve and the pressure control unit are arranged at the top end of the reaction kettle, and two combustors are arranged in the VCU incineration device. According to the utility model, the waste gas of the reaction kettle is collected in a nitrogen sealing and pressure control valve combined manner and is subjected to high-temperature purification treatment through the tail-end equipment VCU incineration device; the problems of high organic material loss, high flow, high blow-by risk and high potential safety hazard of common waste gas collection such as pipeline hard connection, large pipe sleeving small pipe and condenser backflow of reaction kettle waste gas in chemical pharmaceutical enterprises are solved, a traditional RTO incineration treatment mode is replaced, the limitation of gas inlet concentration is broken through, and the problems that equipment is slow to start and high in operation energy consumption are solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to organic waste gas collection and purification treatment technical field, concretely relates to a kind of purification treatment system of waste gas collection synergic pollution reduction and carbon reduction of chemical pharmaceutical. BACKGROUND

[0002] The VOCs emissions of chemical raw materials and chemical products manufacturing industry are one of the industries with the highest VOCs emissions of industrial sources. Chemical pharmaceutical enterprises account for a significant proportion of atmospheric pollutant emissions, and many enterprises have not taken effective control measures. The waste gas collection efficiency is low, and the problem of escape is serious. Therefore, strengthening VOCs emission management and equipping effective waste gas collection and treatment system are the top priority of VOCs management in the chemical pharmaceutical industry.

[0003] In the production process of chemical pharmaceutical, reaction kettle will produce a large amount of volatile organic waste gas. The organic waste gas collection method generally includes pipeline hard connection, large pipe sleeve small pipe dilution concentration reduction, single or multi-stage condensation reflux non-condensable gas and other access to waste gas collection pipeline, which is sent to VOCs purification treatment facility by induced draft fan. Because the gas phase space in the reaction kettle and the organic waste gas collection pipeline are directly or indirectly connected, the system negative pressure causes continuous volatilization loss of organic matter or system pressure imbalance brings problems such as gas leakage between reaction kettles. The air mixed in the sleeve collection method greatly increases the exhaust air volume, and is accompanied by chemical reaction and safety risk of waste gas transportation. The traditional waste gas treatment method has the problems of low collection and treatment efficiency and insufficient safety. Therefore, it is necessary to develop a waste gas treatment system that can effectively collect waste gas and ensure production safety.

[0004] At present, regenerative incineration device (RTO) is widely used in the treatment of chemical and pharmaceutical waste gas. Because the concentration of organic matter entering the RTO device needs to be lower than 25% of the lower explosive limit, there are strict requirements for the concentration of the inlet gas. Usually, the reaction kettle waste gas concentration is too high and needs to be mixed with a large amount of low concentration waste gas, which causes the design processing air volume of RTO device to be tens of thousands, and the system installation capacity is huge. In addition, when the production load is low and the waste gas concentration is insufficient, a large amount of natural gas needs to be supplemented to maintain the RTO self-sustaining combustion process. Large air volume system consumes more purchased electricity and heat, and produces more carbon dioxide emissions.

[0005] VCU burning device, full name is volatile compounds unit, is an environmental governance equipment for treating high concentration volatile organic compounds, and is mainly used for treating VOCs gas with large fluctuation concentration generated in the loading and unloading process of storage tanks, ships and automobiles. The device introduces VOCs gas into a combustion system, completely burns at a high temperature of 800-1000 DEG C, and discharges clean gas without harm and odor into the atmosphere. The VCU burning device has no application case in the chemical and pharmaceutical industry, and is different from the RTO device in the harsh requirement for the import concentration, and is suitable for the waste gas concentration range with large fluctuation, especially for the organic waste gas treatment with high concentration, low flow and intermittent working conditions. In the chemical and pharmaceutical production process, reaction kettles are used to complete process such as synthesis, hydrolysis, neutralization, crystallization, distillation, evaporation, storage, alkylation, polymerization, condensation, heating mixing, constant temperature reaction and the like. Therefore, it is beneficial to the end treatment of waste gas, reduces waste gas emission, and reduces the influence of waste gas on the surrounding environment. Content of the utility model

[0006] The utility model solves the technical problem: provide a kind of chemical and pharmaceutical waste gas collection collaborative pollution reduction carbon reduction purification treatment system.

[0007] In order to solve the above technical problems, the technical scheme adopted by the utility model is as follows:

[0008] A kind of chemical and pharmaceutical waste gas collection collaborative pollution reduction carbon reduction purification treatment system, including sequentially connected waste gas collection device, buffer tank, VOC fan and VCU burning device, the waste gas collection device includes reaction kettle, nitrogen seal valve and pressure control unit arranged at the top end of reaction kettle, the VCU burning device is internally provided with burner.

[0009] As preferred, the pressure control unit includes a first pressure sensor, a first pressure control valve interlocked with the first pressure sensor.

[0010] As preferred, a flow limiting orifice plate bypass and explosion venting sheet are further provided at the top end of the reaction kettle in parallel with the nitrogen seal valve.

[0011] As preferred, the VOC fan and the second pressure sensor are interlocked.

[0012] As preferred, a flame arrester is provided on the connecting pipeline of the waste gas collection device and the buffer tank.

[0013] As preferred, the VCU burning device is connected with the gas pipeline of natural gas supply device.

[0014] As preferred, the two burners are connected in parallel, and the two burners are controlled by the second pressure sensor.

[0015] As preferred, the VCU incineration device further comprises a damper, a combustion-supporting axial flow fan connected with the burner, a sight glass, a flame detector, a temperature sensor, and a detection port.

[0016] As preferred, a switch valve is arranged on the branch connecting the VOC fan and the VCU incineration device, and a second pressure control valve is arranged on the branch connecting the VOC fan and the VCU incineration device.

[0017] As preferred, the number of the burners is two.

[0018] Advantages: Compared with the prior art, the utility model has the following advantages:

[0019] (1) The utility model discloses a nitrogen seal and pressure control valve system are additionally arranged on the reaction kettle, and the waste gas is adjusted through the pressure control valve, and the organic solvent consumption is reduced, the reaction kettle exhaust volume is reduced and the waste gas concentration is improved, nitrogen is added to the reaction kettle gas phase space through the nitrogen seal system and covers the organic steam, prevents the air from invading, and the inert gas atmosphere avoids the fire, explosion and other accidents that can be caused.

[0020] (2) The utility model discloses a nitrogen seal system and pressure control valve are used in combination, solve the problem of low reaction kettle waste gas collection efficiency, large air volume, high organic solvent loss and poor safety, and the collection mode can obviously reduce the reaction kettle waste gas, and the flow is small and the concentration is high, which can further widen the application of VCU device in the field of chemical pharmaceutical waste gas treatment.

[0021] (3) The utility model discloses a nitrogen seal and pressure control valve combination mode is used to collect the reaction kettle waste gas, and the high-temperature purification treatment is handled through the terminal equipment VCU incineration device, solves the problem of the common pipeline hard connection of the reaction kettle waste gas of chemical pharmaceutical enterprises, small pipe and condenser reflux, and the waste gas collection has the problems of high organic material loss, large flow, gas risk and high safety hidden danger, and replaces the traditional RTO incineration treatment mode, breaks through the intake concentration limit, solves the problem of slow equipment start and high running energy consumption.

[0022] (4) The utility model discloses a VCU incineration device for purifying the reaction kettle waste gas, and two burners are arranged, and the waste gas concentration fluctuation under different production conditions can be realized through the switching of the two burners, and the utility model has the advantages of reducing pollution and carbon. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is the purification treatment structure schematic view of the utility model;

[0024] Figure 2 It is the VCU incineration device structure schematic view of the utility model;

[0025] Figure 3The utility model discloses a waste gas collecting device structure schematic view.

[0026] In the drawing: 1, waste gas collecting device, 1.1, nitrogen seal valve, 1.2, flow restrictor orifice plate bypass, 1.3, first pressure sensor, 1.4, first pressure control valve, 1.5, explosion venting sheet, 1.6, reaction kettle, 2, buffer tank, 3, VOC fan, 4, VCU incineration device, 4.1, air door, 4.2, combustor, 4.3, combustion-supporting axial flow fan, 4.4, sight glass, 4.5, flame detector, 4.6, temperature sensor, 4.7, detection port, 5, natural gas supply device, 6, flame arrester, 7, second pressure sensor, 8, on-off valve, 9, second pressure control valve. DETAILED DESCRIPTION

[0027] The utility model will be further illustrated in connection with specific embodiment, and the embodiment is implemented under the premise of the utility model technical scheme, and it should be understood that these embodiments are only used for illustrating the utility model and are not used for limiting the scope of the utility model.

[0028] As Figure 1 And Figure 3 The utility model discloses a kind of waste gas collection of chemical pharmacy cooperates with the purification treatment system of pollution reduction and carbon reduction of reducing, including waste gas collecting device 1, buffer tank 2, VOC fan 3, VCU incineration device 4, natural gas supply device 5, flame arrester 6, second pressure sensor 7, on-off valve 8, second pressure control valve 9.

[0029] Waste gas collecting pipeline of waste gas collecting device 1 is connected with buffer tank 2 by flame arrester 6, the outlet of buffer tank 2 is sequentially connected VOC fan 3 and VCU incineration device 4, and VOC fan 3 and second pressure sensor 7 are interlocked arrangement.VCU incineration device 4 is connected with the gas transmission end of natural gas supply device 5.On the branch of VOC fan 3 and VCU incineration device 4, on-off valve 8 is provided, and second pressure control valve 9 is provided on the branch of VOC fan 3 and VCU incineration device 4.VOC fan 3 before and after waste gas pipeline are provided with flame arrester.

[0030] VOCs waste gas collected by waste gas collecting device 1 first reaches buffer tank 2, and VOC fan 3 is automatically frequency conversion operation through second pressure sensor 7 interlock, and VOCs waste gas is sent to VCU incineration device 4 for processing by VOC fan 3 pressurization.The import and export of VOC fan 3 are connected with pipeline soft connection.

[0031] The VCU incineration unit 4 includes an air damper 4.1, a burner 4.2, a combustion-supporting axial flow fan 4.3, a sight glass 4.4, a flame detector 4.5, a temperature sensor 4.6, and a detection port 4.7. There are two burners 4.2 and two combustion-supporting axial flow fans 4.3. The two burners 4.2 are connected in parallel. The VCU incineration unit 4 has two burners 4.2 inside. Depending on the production load (i.e., the exhaust volume of the VOCs waste gas collection device 1), one or both sets of burners 4.2 can be automatically activated via the second pressure sensor 7, effectively reducing operating energy consumption. When the exhaust volume of the waste gas collection device 1 is low, the switching valve 8 activates one set of burners 4.2; when the exhaust volume is high, both sets of burners 4.2 are activated simultaneously via the second pressure control valve 9 to ensure compliance with emission standards.

[0032] The upper side wall of the VCU incinerator 4 is equipped with a detection port 4.7 and a temperature sensor 4.6. A flame detector 4.5 and a sight glass 4.4 are installed above each burner 4.2 for observing and analyzing combustion. The burners 4.2 and the combustion-supporting axial flow fan 4.3 constitute the combustion chamber of the VCU incinerator 4. An air damper 4.1 is located at the bottom of the combustion chamber within the VCU incinerator 4. The VCU incinerator 4 automatically controls the internal operating temperature of the combustion chamber through the air damper 4.1 at the bottom of the combustion chamber. When the temperature sensor 4.6 detects that the internal temperature of the VCU incinerator 4 is lower than the set value (760℃), the opening of the air damper 4.1 will decrease to reduce the amount of air entering the system, thereby increasing the operating temperature. If the internal temperature exceeds the set value, the opening of the air damper 4.1 will increase to introduce more air, thereby achieving a cooling effect.

[0033] Each burner 4.2 is supplied with air by an independent combustion-supporting axial flow fan 4.3, which creates turbulent airflow at the top of the burner 4.2 to ensure thorough mixing and sufficient oxygen content, resulting in more complete combustion of VOCs. Simultaneously, a natural gas supply device 5 is connected to the pipeline through which the VOCs enter the burner 4.2. This device is automatically controlled by the system; when the amount of VOCs is insufficient to support combustion, the natural gas supply device 5 can supplement fuel for co-combustion, achieving extremely high VOCs removal efficiency.

[0034] like Figure 2 As shown, the exhaust gas collection device 1 includes a nitrogen sealing valve 1.1, a flow-limiting orifice plate bypass 1.2, a pressure control unit, a pressure relief valve 1.5, and a reaction vessel 1.6. There are four reaction vessels 1.6. A pressure relief valve 1.5 is installed on the top of each reaction vessel 1.6 to ensure pressure relief under extreme conditions.

[0035] Nitrogen seal valve 1.1 and flow restrictor bypass 1.2 are arranged on the nitrogen inlet of each reactor 1.6. In order to reduce nitrogen consumption, the set pressure of nitrogen seal valve 1.1 is reasonably set. Under normal circumstances, nitrogen seal valve group 1.1 is used to maintain the pressure of the gas phase space in reactor 1.6 at about 0.3kPa. When the pressure of the gas phase space is higher than 0.5kPa, nitrogen seal valve 1.1 is closed and the supply of nitrogen is stopped. When the pressure of the gas phase space is lower than 0.2kPa, nitrogen seal valve 1.1 is opened and the supply of nitrogen is started. When nitrogen seal valve 1.1 needs to be repaired or fails, flow restrictor bypass 1.2 is used to supply nitrogen to reactor 1.6. The main function of nitrogen seal valve 1.1 is to inject nitrogen into reactor 1.6 to form a protective layer to prevent oxygen from entering and reduce the carbon emissions caused by oxidation reaction, thereby improving the safety of the reaction.

[0036] The pressure control unit includes first pressure sensor 1.3 and first pressure control valve 1.4. First pressure sensor 1.3 is arranged on the top of each reactor 1.6, and first pressure control valve 1.4 is interlocked with first pressure sensor 1.3. When the first pressure sensor 1.3 on the reactor 1.6 reaches 0.9kPa and the exhaust take-off set pressure of the reactor 1.6 is higher than the take-off pressure of the first pressure control valve 1.4, the reactor 1.6 exhales to the waste gas collection pipeline. According to the operation process, reaction characteristics and pressure bearing capacity of the reactor 1.6, the set pressure of the first pressure control valve 1.4 is reasonably set to finely control the gas discharge process in the reactor 1.6. When the pressure in the reactor 1.6 falls, the first pressure control valve 1.4 is closed to cut off the connection between the reactor 1.6 and the outside world, thereby avoiding the gas leakage between reactors 1.6 and the continuous evaporation loss of organic materials, and improving the waste gas collection efficiency.

[0037] The working process of the utility model is as follows:

[0038] Nitrogen is injected into reactor 1.6 to cover the organic solvent and avoid contact with air. Nitrogen seal valve 1.1 is used to maintain the constant pressure of the gas phase space in reactor 1.6. When the exhaust take-off set pressure of reactor 1.6 is higher than the take-off pressure of first pressure control valve 1.4, reactor 1.6 exhales to the waste gas collection pipeline. The discharged VOCs waste gas is first subjected to natural condensation in buffer tank 2. The second pressure sensor 7 is interlocked with VOC fan 3 to automatically run in variable frequency mode. The VOCs waste gas is pressurized by VOC fan 3 and sent to VCU incineration device 4 for treatment. According to the production load (i.e. the exhaust capacity of waste gas collection device 1), one or two groups of burners 4.2 can be automatically started by the second pressure sensor 7, which can effectively reduce the operating energy consumption. When the exhaust capacity of waste gas collection device 1 is low, single group of burner 4.2 is started by opening switch valve 8. When the exhaust capacity is high, two groups of burners 4.2 are started by opening second pressure control valve 9, thereby ensuring the standard emission.

[0039] When the nitrogen seal valve 1.1 needs to be overhauled or fails, the flow-restricted orifice bypass 1.2 is used to supplement the nitrogen gas in the reactor 1.6. When the temperature sensor 4.6 detects that the internal temperature of the VCU incineration device 4 is lower than the set value (760℃), the damper 4.1 opening will be closed to reduce the amount of air entering the system to increase the operating temperature. If the internal temperature exceeds the set value, the damper 4.1 opening will be opened to introduce more air to achieve the effect of cooling. When the amount of VOCs exhaust gas is insufficient to support combustion, fuel can be supplemented by the natural gas supply device 5 to co-combust, which can achieve ultra-high VOCs removal efficiency.

[0040] Taking the collection and treatment of the reactor exhaust gas of a certain pharmaceutical enterprise as an example, the reactor exhaust gas is collected by the condensation reflux large pipe and small pipe method, and the reactor venting air volume is generally usually 50m 3 / h per unit to 100m 3 / h per unit (including dilution air), the nitrogen seal and pressure control valve combination collection of the present application is used, and the exhaust gas is usually discharged at a rate of 2 m 3 / h to 5 m 3 / h, the large air volume of organic waste gas greatly reduces the concentration, and the exhaust gas air volume is reduced by more than 90%. The enterprise end adopts an RTO incineration treatment with a design air volume of 30000 Nm 3 / h, the system installed capacity is 220kW, the VCU incineration treatment is used, the design air volume is only 3000 Nm 3 / h, the system installed capacity is 15kw, the power consumption per hour is reduced by 205kWh under full load operation, and the carbon dioxide emission is reduced by 123 kg per hour. Under normal circumstances, standby operation, the RTO consumes natural gas 65 m 3 / h, the VCU incineration device consumes 32.5 m 3 / h, the natural gas consumption per hour is reduced by 32.5m 3 , the carbon dioxide emission is reduced by 70.4 kg per hour. The purification efficiency of the VCU incineration device can reach 99.99%, which is higher than the purification efficiency of the RTO 98%, and the exhaust gas concentration is less than 10mg / m 3 below.

[0041] The above description is only the preferred embodiments of the present application, and it should be pointed out that for ordinary skilled persons in the technical field, without departing from the principles of the present application, a number of improvements and refinements can be made, and these improvements and refinements should also be considered as the protection range of the present application.

Claims

1. A purification treatment system for collecting and synergistically reducing pollution and carbon dioxide of chemical pharmaceutical waste gas, characterized in that, The device comprises a waste gas collecting device (1), a buffer tank (2), a VOC fan (3) and a VCU burning device (4) connected in sequence, the waste gas collecting device (1) comprises a reaction kettle (1.6), a nitrogen seal valve (1.1) arranged at the top end of the reaction kettle (1.6) and a pressure control unit, and the VCU burning device (4) is internally provided with a burner (4.2).

2. The purification treatment system for synergistically reducing pollution and carbon emission of chemical pharmaceutical waste gas collection according to claim 1, characterized in that, The pressure control unit comprises a first pressure sensor (1.3) and a first pressure control valve (1.4) arranged in interlock with the first pressure sensor (1.3).

3. The purification treatment system for synergistically reducing pollution and carbon emission of chemical pharmaceutical waste gas collection according to claim 1, characterized in that, A flow limiting orifice bypass (1.2) and an explosion venting sheet (1.5) are further arranged at the top end of the reaction kettle (1.6) in parallel with the nitrogen seal valve (1.1).

4. The purification treatment system for synergistically reducing pollution and carbon emission of chemical-pharmaceutical waste gas collection according to claim 1, characterized in that, The VOC fan (3) and a second pressure sensor (7) are arranged in interlock.

5. The purification system for waste gas collection of chemical-pharmaceutical pollution reduction and carbon reduction synergy according to claim 1, characterized in that, A flame arrester (6) is arranged on the connecting pipeline of the waste gas collecting device (1) and the buffer tank (2).

6. The purification system for waste gas collection of chemical-pharmaceutical pollution reduction and carbon reduction synergy according to claim 1, characterized in that, The VCU burning device (4) is connected with a gas supply device (5) through a gas pipeline.

7. The purification system for waste gas collection of chemical-pharmaceutical industry with synergistic pollution reduction and carbon reduction according to claim 1, characterized in that, The two burners (4.2) are connected in parallel and controlled by the second pressure sensor (7).

8. The purification system for waste gas collection of chemical-pharmaceutical industry with synergistic pollution reduction and carbon reduction of claim 1, wherein, The VCU burning device (4) further comprises a damper (4.1), a combustion-supporting axial flow fan (4.3) connected with the burner (4.2), a sight glass (4.4), a flame detector (4.5), a temperature sensor (4.6) and a detection port (4.7).

9. The chemical-pharmaceutical waste gas collection synergistic pollution reduction and carbon reduction purification treatment system according to claim 1, characterized in that, A switch valve (8) is arranged on the branch pipeline connecting the VOC fan (3) and the VCU burning device (4), and a second pressure control valve (9) is arranged on the branch pipeline connecting the VOC fan (3) and the VCU burning device (4).

10. The purification system for waste gas collection of chemical-pharmaceutical pollution reduction and carbon reduction synergy according to claim 1, characterized in that, The number of the burners (4.2) is two.

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