VOCs gas treatment device

Abstract

The utility model belongs to the technical field of waste gas treatment, and discloses a VOCs (volatile organic compounds) gas treatment device which comprises a treatment furnace, a fan unit, a concentration detection unit and a combustion-supporting unit, low-concentration VOCs gas is treated in the treatment furnace in a mode of combining heat storage combustion and super-enthalpy combustion, and high-concentration VOCs gas is treated in the treatment furnace in a mode of combining direct combustion and super-enthalpy combustion, so that the VOCs gas treatment device has the functions of heat storage combustion and super-enthalpy combustion and the functions of direct combustion and super-enthalpy combustion at the same time; and therefore, the function of treating both high-concentration VOCs gas and low-concentration VOCs gas is realized.

Description

TECHNICAL FIELD

[0001] The utility model relates to waste gas treatment technical field especially, relates to a VOCs gas treatment device. BACKGROUND

[0002] VOCs is the important precursor of forming fine particulate (PM2.5) and ozone (O3), and relative to the control of PM2.5, SO2, NOx and other pollutants, VOCs gas management foundation is relatively weak. At present, the key industries such as petroleum refining, petrochemical industry, chemical raw material medicine, chemical pesticide raw drug manufacturing, industrial coating, packaging printing, organic chemical industry are the main emission sources of VOCs in China, including raw material storage and transportation, production, recovery, storage, loading, sewage treatment and other links, VOCs is generated, has the characteristics such as many and scattered dispersion points, complex component, large flow fluctuation, concentration uneven, is the difficulty of VOCs treatment. Therefore, realizing the emission reduction and effective control of VOCs pollution is the key to win the blue sky defense war.

[0003] End treatment technology is the last pass of VOCs treatment, but at present, the application rate of some low-efficiency treatment facilities in domestic industry is more than 50%, for example, single low-temperature plasma, photocatalysis, UV photolysis, single water spray absorption, etc., the gas emission after treatment does not reach the standard. Combustion method is a kind of end treatment technology with wide application range at present, which has the characteristics of stability and high efficiency. Combustion method is divided into direct combustion, regenerative oxidation, catalytic combustion, etc., and its principle is to establish a high-temperature furnace environment through fuel gas / electricity, then VOCs organic waste gas is introduced into the furnace to generate oxidation decomposition reaction, generating CO2 and H2O.

[0004] In view of the problems of complex component, irregular emission, unstable gas volume, large concentration fluctuation and other difficulties and pain points in the VOCs gas treatment process of current industries, the common treatment method in the industry is to separate VOCs gas with different high and low concentrations, and use different processes to treat them, for example, condensation, adsorption, direct combustion for high-concentration gas, and adsorption, absorption, regenerative combustion, catalytic combustion for low-concentration gas;Or combination process of the above technologies, such as condensation + adsorption / absorption / combustion, or adsorption + regenerative combustion / catalytic combustion, which cannot treat VOCs gas with different high and low concentrations at the same time.

[0005] Therefore, it is urgent to provide a VOCs gas treatment device to solve the above problems. SUMMARY

[0006] The utility model discloses a VOCs gas treatment device, which can treat high-concentration VOCs gas and low-concentration VOCs gas at the same time.

[0007] To achieve this purpose, the utility model adopts the following technical scheme:

[0008] A VOCs gas treatment device comprises:

[0009] A treatment furnace comprising a first regenerator, a first super-enthalpy combustion chamber, a hearth, a second super-enthalpy combustion chamber, a second regenerator, a first gas inlet, a second gas inlet, a first gas outlet, a second gas outlet and a third gas outlet, the first regenerator, the first super-enthalpy combustion chamber, the hearth, the second super-enthalpy combustion chamber and the second regenerator being sequentially connected, the first gas inlet and the second gas outlet being selectively connected with the first regenerator, the second gas inlet and the first gas outlet being selectively connected with the second regenerator, the third gas outlet being selectively connected with the hearth, the first regenerator being provided with a first porous regenerator, the second regenerator being provided with a second porous regenerator, the first super-enthalpy combustion chamber being provided with a first porous medium layer, and the second super-enthalpy combustion chamber being provided with a second porous medium layer;

[0010] A fan unit comprising a first fan, the air outlet side of the first fan being connected with the first gas inlet and the second gas inlet, and the first fan being used for introducing external air;

[0011] A concentration detection unit comprising a first concentration detection device, the air inlet end of the first concentration detection device being used for being connected with a VOCs gas source, and the air outlet end of the first concentration detection device being connected with the first gas inlet and the second gas inlet;

[0012] A combustion-supporting unit used for providing heat to the inside of the hearth.

[0013] As preferred, the VOCs gas treatment device further comprises a pipeline unit and a control unit, the pipeline unit comprising a first gas pipeline, a second gas pipeline, a first flue gas pipeline, a second flue gas pipeline and a third flue gas pipeline, and the control unit comprising a first shut-off valve, a second shut-off valve, a third shut-off valve, a fourth shut-off valve and a fifth shut-off valve, one end of the first gas pipeline being connected with the first gas inlet, the other end of the first gas pipeline being connected with the air outlet side of the first fan and the air outlet end of the first concentration detection device, one end of the second gas pipeline being connected with the second gas inlet, the other end of the second gas pipeline being connected with the air outlet side of the first fan and the air outlet end of the first concentration detection device, one end of the first flue gas pipeline being connected with the second gas outlet, the other end of the first flue gas pipeline being capable of being connected with the external environment, one end of the second flue gas pipeline being connected with the second gas outlet, the other end of the second flue gas pipeline being capable of being connected with the external environment, one end of the third flue gas pipeline being connected with the third gas outlet, the other end of the third flue gas pipeline being capable of being connected with the external environment, the first shut-off valve being arranged on the first gas pipeline, the second shut-off valve being arranged on the second gas pipeline, the third shut-off valve being arranged on the first flue gas pipeline, the fourth shut-off valve being arranged on the second flue gas pipeline, and the fifth shut-off valve being arranged on the third flue gas pipeline.

[0014] As preferred, the gas pipeline further comprises a third gas pipeline, one end of the third gas pipeline is communicated with the other end of the first gas pipeline and the other end of the second gas pipeline, the other end of the third gas pipeline is used for being communicated with the VOCs gas source, the first concentration detection device is arranged on the third gas pipeline, the air outlet side of the first fan is communicated with the third gas pipeline, and the communication position of the air outlet side of the first fan with the third gas pipeline is located downstream of the first concentration detection device.

[0015] As preferred, the control unit comprises a first flame arrester and a second flame arrester, the first flame arrester is arranged on the first gas pipeline, and the second flame arrester is arranged on the second gas pipeline.

[0016] As preferred, the VOCs gas treatment device further comprises a temperature detection unit, the temperature detection unit comprises a first temperature detection device, the control unit further comprises a sixth cut-off valve and a controller, the measurement end of the first temperature detection device is inserted into the hearth, the sixth cut-off valve is arranged on the third gas pipeline, the first temperature detection device and the sixth cut-off valve are signal connected with the controller, and the controller can control opening and closing of the sixth cut-off valve.

[0017] As preferred, the VOCs gas treatment device further comprises a pressure detection device, the detection end of the pressure detection device is inserted into the hearth, the pressure detection device and the fifth cut-off valve are signal connected with the controller, and the controller can control opening and closing of the fifth cut-off valve.

[0018] As preferred, the VOCs gas treatment device further comprises a gas mixer, the gas mixer is arranged on the third gas pipeline, and the gas mixer is located downstream of the communication position of the air outlet side of the first fan with the third gas pipeline.

[0019] As preferred, the combustion-supporting unit further comprises a burner, the fan unit further comprises a second fan, the outlet of the burner is communicated with the hearth, the first inlet of the burner is used for introducing fuel, the second inlet of the burner is communicated with the air outlet side of the second fan, and the second fan is used for introducing external air.

[0020] As preferred, the first porous medium layer and / or the second porous medium layer are porous ceramic silicon carbide layers.

[0021] As preferred, a first refractory insulation layer is arranged on the inner wall of the third flue gas pipeline.

[0022] The utility model discloses beneficial effects:

[0023] The utility model provides a VOCs gas treatment device, including processing furnace, fan unit, concentration detection unit and combustion supporting unit, processing furnace includes first regenerator, first superenthalpy combustion chamber, hearth, second superenthalpy combustion chamber, second regenerator, first air inlet, second air inlet, first gas outlet, second gas outlet and third gas outlet, first regenerator, first superenthalpy combustion chamber, hearth, second superenthalpy combustion chamber and second regenerator are communicated in proper order, first air inlet and second gas outlet are selectively communicated with first regenerator, second air inlet and first gas outlet are selectively communicated with second regenerator, third gas outlet is selectively communicated with hearth, be equipped with first porous heat storage spare in first regenerator, be equipped with second porous heat storage spare in second regenerator, be equipped with first porous medium layer in first superenthalpy combustion chamber, be equipped with second porous medium layer in second superenthalpy combustion chamber, fan unit includes first fan, and the air outlet side of first fan is communicated with first air inlet and second air inlet, and first fan is used for the import outside air, concentration detection unit includes first concentration detection device, and the air inlet end of first concentration detection device is used for with VOCs gas source communication, and the air outlet end of first concentration detection device is communicated with first air inlet and second air inlet, combustion supporting unit is used for providing heat to hearth inside. Combustion supporting unit provides heat for hearth, and first porous medium layer and second porous medium layer absorb heat, make first porous medium layer and second porous medium layer be heated to infrared state excitation mid-infrared light, and then first porous medium layer and second porous medium layer have strong high temperature radiation capacity, and the first porous heat storage spare close to first porous medium layer is heated by first porous medium layer, and the second porous heat storage spare close to second porous medium layer is heated by second porous medium layer.When the VOCs gas concentration is low, the third outlet is closed, making the first inlet and first outlet a group, and the second inlet and second outlet a group, and the two groups of inlets and outlets are opened and closed alternately. For example, the first inlet and first outlet are opened, and the second inlet and second outlet are closed. The VOCs gas and the air introduced by the first fan enter the processing furnace through the first inlet. In the first regenerator chamber, it is preheated by the first porous heat storage element, and then enters the first superenthalpy combustion chamber where a superenthalpy combustion reaction occurs in the first porous medium layer. Then it enters the furnace and undergoes further oxidation and decomposition reactions to generate CO2 and H2O. When the high-temperature flue gas passes through the second superenthalpy combustion chamber and the second regenerator chamber, it retains heat, causing the temperature of the second porous heat storage element, which is far away from the second porous medium layer, to rise. Finally, the gas is discharged from the treatment furnace through the first outlet. Then, the second inlet and the second outlet are opened, and the first inlet and the first outlet are closed. When the VOCs gas and the air introduced by the first fan enter the furnace through the second inlet, the second regenerator chamber, and the second superenthalpy combustion chamber, the temperature retained in the second regenerator preheats the mixed gas. Superenthalpy combustion reaction occurs in the second porous medium layer. After entering the furnace, the gas undergoes further oxidation and decomposition reaction to generate CO2 and H2O. The high-temperature flue gas retains heat when passing through the first superenthalpy combustion chamber and the first regenerator chamber, which raises the temperature of the first porous regenerator chamber that is far away from the first porous medium layer. The gas is then discharged from the treatment furnace through the second outlet. Thus, low-concentration VOCs gas is treated by combining regenerator combustion and superenthalpy combustion. When the VOCs gas concentration is high, the first inlet, the second inlet, and the third outlet are opened, while the first and second outlets are closed. A portion of the VOCs gas and air introduced by the first fan enters the first superenthalpy combustion chamber through the first inlet and the first regenerator chamber for superenthalpy combustion, then burns directly within the furnace, and finally exits the furnace through the third outlet. The other portion of the VOCs gas and air introduced by the first fan enters the second superenthalpy combustion chamber through the second inlet and the second regenerator chamber for superenthalpy combustion, then burns directly within the furnace, and finally exits the furnace through the third outlet. This combination of direct combustion and superenthalpy combustion effectively treats high-concentration VOCs gas. Therefore, this VOCs gas treatment device possesses both regenerator combustion + superenthalpy combustion and direct combustion + superenthalpy combustion functions, enabling it to treat both high-concentration and low-concentration VOCs gas. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the processing furnace structure provided by this utility model;

[0025] Figure 2 This is a schematic diagram of the VOCs gas treatment device provided by this utility model;

[0026] Figure 3 yes Figure 2Enlarged view at A;

[0027] Figure 4 is Figure 2 Enlarged view at B.

[0028] In the figure:

[0029] 10, treatment furnace; 11, first regenerator; 111, first porous regenerative element; 12, first super-enthalpy combustion chamber; 121, first porous medium layer; 13, furnace chamber; 131, third air inlet; 132, third air outlet; 14, second super-enthalpy combustion chamber; 141, second porous medium layer; 15, second regenerator; 151, second porous regenerative element; 16, first chamber; 161, first air inlet; 162, second air outlet; 17, second chamber; 171, second air inlet; 172, first air outlet; 18, furnace shell; 19, second refractory insulation layer; 20, VOCs gas source; 21, first air blower; 22, second air blower; 31, first concentration detection device; 32, second concentration detection device; 33, first flow detection device; 34, second flow detection device; 41, first gas pipeline; 42, second gas pipeline; 43, first flue gas pipeline; 44, second flue gas pipeline; 45, third flue gas pipeline; 46, third gas pipeline; 47, fuel gas pipeline; 50, first shut-off valve; 51, second shut-off valve; 52, third shut-off valve; 53, fourth shut-off valve; 54, fifth shut-off valve; 55, sixth shut-off valve; 56, first flame arrester; 57, second flame arrester; 58, first regulating valve; 59, second regulating valve; 61, first temperature detection device; 62, second temperature detection device; 63, third temperature detection device; 64, fourth temperature detection device; 65, fifth temperature detection device; 66, sixth temperature detection device; 67, seventh temperature detection device; 68, pressure detection device; 7, gas mixer; 81, burner; 82, pressure reducing valve; 83, solenoid valve; 84, fuel gas source; 90, chimney; 91, third refractory insulation layer. DETAILED DESCRIPTION

[0030] The present application will be further described below in conjunction with the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present application, and not to limit the present application. In addition, it should be noted that, in order to facilitate the description, only the parts related to the present application are shown in the drawings, rather than all the structures.

[0031] In the description of the utility model, unless another definite provision and limitation, the term "link", "connect", "fix" should do broad sense understanding, for example, can be fixed connection, also can be detachable connection, or be integrated;Can be mechanical connection, also can be electrical connection;Can be directly connected, also can be indirectly connected through intermediate medium, can be two element internal communication or two element mutual action relationship.For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0032] In the utility model, unless another definite provision and limitation, the first feature is "on" or "under" the second feature can include the first and second features direct contact, also can include the first and second features is not direct contact but is through the contact between other features between them.And, the first feature is "on", "above" and "on" the second feature includes the first feature is directly above and obliquely above the second feature, or just indicates that the first feature horizontal height is higher than the second feature.The first feature is "under", "below" and "under" the second feature includes the first feature is directly below and obliquely below the second feature, or just indicates that the first feature horizontal height is less than the second feature.

[0033] In the description of the embodiment, the term "on", "under", "right", etc. Orientation or position relationship is based on the orientation or position relationship shown in the drawing, only for the convenience of description and simplification operation, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore cannot be understood as a limitation on the utility model.In addition, the term "first", "second" is only used to distinguish in the description, and has no special meaning.

[0034] The embodiment provides a VOCs gas treatment device to realize that one device can process high concentration VOCs gas and low concentration VOCs gas.

[0035] Specifically, as Figures 1 to 4As shown, a VOCs gas treatment device includes a treatment furnace 10, a fan unit, a concentration detection unit and a combustion supporting unit, the treatment furnace 10 includes a first regenerator 11, a first super-enthalpy combustion chamber 12, a hearth 13, a second super-enthalpy combustion chamber 14, a second regenerator 15, a first gas inlet 161, a second gas inlet 171, a first gas outlet 172, a second gas outlet 162 and a third gas outlet 132, the first regenerator 11, the first super-enthalpy combustion chamber 12, the hearth 13, the second super-enthalpy combustion chamber 14 and the second regenerator 15 are sequentially communicated, the first gas inlet 161 and the second gas outlet 162 are selectively communicated with the first regenerator 11, the second gas inlet 171 and the first gas outlet 172 are selectively communicated with the second regenerator 15, the third gas outlet 132 is selectively communicated with the hearth 13, the first regenerator 11 is provided with a first porous regenerator 111, the second regenerator 15 is provided with a second porous regenerator 151, the first super-enthalpy combustion chamber 12 is provided with a first porous medium layer 121, and the second super-enthalpy combustion chamber 14 is provided with a second porous medium layer 141; the fan unit includes a first fan 21, the air outlet side of the first fan 21 is communicated with the first gas inlet 161 and the second gas inlet 171, and the first fan 21 is used for introducing external air; the concentration detection unit includes a first concentration detection device 31, the air inlet end of the first concentration detection device 31 is used for being communicated with a VOCs gas source 20, and the air outlet end of the first concentration detection device 31 is communicated with the first gas inlet 161 and the second gas inlet 171; and the combustion supporting unit is used for providing heat to the inside of the hearth 13.

[0036] The combustion-supporting unit provides heat for the furnace 13, and the first porous medium layer 121 and the second porous medium layer 141 absorb the heat, so that the first porous medium layer 121 and the second porous medium layer 141 are heated to infrared state excitation mid-infrared light, and then the first porous medium layer 121 and the second porous medium layer 141 have strong high-temperature radiation capacity. The first porous heat storage member 111 close to the first porous medium layer 121 is heated by the first porous medium layer 121, and the second porous heat storage member 151 close to the second porous medium layer 141 is heated by the second porous medium layer 141. When the VOCs gas concentration is low, the third gas outlet 132 is closed, the first gas inlet 161 and the first gas outlet 172 form a group, the second gas inlet 171 and the second gas outlet 162 form a group, and the two groups of gas inlets and outlets are alternately opened and closed. For example, the first gas inlet 161 and the first gas outlet 172 are opened, and the second gas inlet 171 and the second gas outlet 162 are closed. The VOCs gas and the air introduced by the first fan 21 enter the treatment furnace 10 through the first gas inlet 161, are preheated by the first porous heat storage member 111 in the first heat storage chamber 11, then undergo super-enthalpy combustion reaction in the first porous medium layer 121 in the first super-enthalpy combustion chamber 12, then further undergo oxidation decomposition reaction in the furnace 13 to generate CO2 and H2O, and the high-temperature flue gas leaves heat when passing through the second super-enthalpy combustion chamber 14 and the second heat storage chamber 15, so that the temperature of the second porous heat storage member 151 away from the second porous medium layer 141 increases, and finally the treatment furnace 10 is discharged through the first gas outlet 172. When the second porous heat storage member 151 reaches the set temperature, the second gas inlet 171 and the second gas outlet 162 are opened, and the first gas inlet 161 and the first gas outlet 172 are closed. When the VOCs gas and the air introduced by the first fan 21 enter the furnace 13 from the second gas inlet 171 through the second heat storage chamber 15 and the second super-enthalpy combustion chamber 14, the temperature stored in the second heat storage member preheats the mixed gas, and then the super-enthalpy combustion reaction occurs in the second porous medium layer 141, and then the oxidation decomposition reaction further occurs in the furnace 13 to generate CO2 and H2O. The high-temperature flue gas leaves heat when passing through the first super-enthalpy combustion chamber 12 and the first heat storage chamber 11, so that the temperature of the first porous heat storage member 111 away from the first porous medium layer 121 increases, and the treatment furnace 10 is discharged through the second gas outlet 162, thereby treating low-concentration VOCs gas by combining regenerative combustion and super-enthalpy combustion.When the VOCs gas concentration is high, the first air inlet 161, the second air inlet 171 and the third air outlet 132 are opened, and the first air outlet 172 and the second air outlet 162 are closed. The VOCs gas and part of the air introduced by the first fan 21 enter the first super-enthalpy combustion chamber 12 through the first air inlet 161 and the first regenerative chamber 11 to perform super-enthalpy combustion, then directly combust in the hearth 13, and finally are discharged from the third air outlet 132 of the treatment furnace 10. Another part of the VOCs gas and the air introduced by the first fan 21 enter the second super-enthalpy combustion chamber 14 through the second air inlet 171 and the second regenerative chamber 15 to perform super-enthalpy combustion, then directly combust in the hearth 13, and finally are discharged from the third air outlet 132 of the treatment furnace 10, so that the high-concentration VOCs gas is treated by the combination of direct combustion and super-enthalpy combustion. It can be seen that the VOCs gas treatment device has the functions of regenerative combustion + super-enthalpy combustion and direct combustion + super-enthalpy combustion, and further realizes the functions of treating both high-concentration VOCs gas and low-concentration VOCs gas. It should be noted that the lower VOCs gas concentration refers to VOCs gas concentration ≤ 15% VOL, and the higher VOCs gas concentration refers to VOCs gas concentration > 15% VOL.

[0037] The first porous medium layer 121 in the super-enthalpy combustion state can serve as an ignition source, and the first super-enthalpy combustion chamber 12 provides a reaction site for VOCs gas combustion. The combustion flame surface stays in the first porous medium layer 121. At the same time, the second porous medium layer 141 also serves as an ignition source, and the second super-enthalpy combustion chamber 14 provides a reaction site for VOCs gas combustion. The combustion flame surface stays in the second porous medium layer 141. Therefore, the reaction speed is greatly improved, and the reaction is more complete. Under the action of smoke convection, heat conduction and strong radiation of SiC, a small amount of incompletely reacted VOCs gas further reacts in the hearth 13, and the treatment efficiency is greatly improved.

[0038] In the working mode of treating high-concentration VOCs gas, the first porous heat storage member 111 in the first regenerator 11 and the second porous heat storage member 151 in the second regenerator 15 are cooled by the low-temperature VOCs gas entering through the first gas inlet 161 and the second gas inlet 171 for a long time, except for a small part of the first porous heat storage member 111 and a small part of the second porous heat storage member 151 near the first porous medium layer 121 and the second porous medium layer 141 which are still in a high-temperature heat storage state due to the influence of "super-enthalpy combustion", the rest of the first porous heat storage member 111 and the second porous heat storage member 151 are cooled. At this time, the first porous heat storage member 111 and the second porous heat storage member 151 change their role to a fire barrier. Since the pore size of the first porous heat storage member 111 and the second porous heat storage member 151 is smaller than the pore size required for the flame of VOCs gas to propagate, the flame is easily extinguished when it propagates upstream, so the first porous heat storage member 111 and the second porous heat storage member 151 can play a backfire prevention role. In this embodiment, the first porous heat storage member 111 and the second porous heat storage member 151 are cordierite, which has good high-temperature resistance and heat storage performance, and uniform small holes (pore size ≤2.5mm), and has both gas flow and backfire prevention functions. In other embodiments, the first porous heat storage member 111 and the second porous heat storage member 151 are porous ceramic aluminum oxide.

[0039] Further, the first porous medium layer 121 and the second porous medium layer 141 are both porous ceramic silicon carbide layers. The three-dimensional pore structure of porous ceramic silicon carbide has the characteristics of high strength, high hardness, high thermal conductivity, high thermal shock resistance, etc., and is particularly suitable as a carrier for realizing super-enthalpy combustion of VOCs gas in porous media. The high thermal conductivity and high radiation capacity of porous ceramic silicon carbide can quickly transfer the heat generated by the combustion of VOCs gas, making the temperature field in the entire treatment furnace 10 extremely uniform, ensuring stable temperature fluctuations in the hearth 13, so that a large amount of thermal NOx is not generated, so that the flue gas does not need to be denitrified, achieving the effect of direct emission. In other embodiments, the first porous medium layer 121 and the second porous medium layer 141 are both porous ceramic cordierite layers, or one of the first porous medium layer 121 and the second porous medium layer 141 is a porous ceramic silicon carbide layer, and the other is a porous ceramic cordierite layer.

[0040] Optionally, the processing furnace 10 further comprises a first chamber 16 and a second chamber 17, the first inlet 161 and the second outlet 162 selectively communicate with the first regenerative chamber 11 through the first chamber 16, and the second inlet 171 and the first outlet 172 selectively communicate with the second regenerative chamber 15 through the second chamber 17. The communication between the first inlet 161 and the first regenerative chamber 11 is achieved through the first chamber 16, and the communication between the second inlet 171 and the second regenerative chamber 15 is achieved through the second chamber 17.

[0041] Optionally, the processing furnace 10 further comprises a furnace shell 18, and a second refractory insulation layer 19 is arranged in the furnace shell 18. The furnace shell 18 is made of carbon steel elements, and the second refractory insulation layer 19 is made of high-temperature-resistant ceramic fiber modules. The second refractory insulation layer 19 effectively insulates the influence of the high temperature of the hearth 13 on the furnace shell 18, reduces heat loss, and reduces the overall weight of the processing furnace 10. In other embodiments, the second refractory insulation layer 19 is a diatomite layer.

[0042] Optionally, the VOCs gas treatment device further comprises a pipeline unit and a control unit, the pipeline unit comprises a first gas pipeline 41, a second gas pipeline 42, a first flue gas pipeline 43, a second flue gas pipeline 44 and a third flue gas pipeline 45, and the control unit comprises a first shut-off valve 50, a second shut-off valve 51, a third shut-off valve 52, a fourth shut-off valve 53, a fifth shut-off valve 54 and a controller, one end of the first gas pipeline 41 is in communication with the first gas inlet 161, the other end of the first gas pipeline 41 is in communication with the air outlet side of the first fan 21 and the gas outlet end of the first concentration detection device 31, one end of the second gas pipeline 42 is in communication with the second gas inlet 171, the other end of the second gas pipeline 42 is in communication with the air outlet side of the first fan 21 and the gas outlet end of the first concentration detection device 31, one end of the first flue gas pipeline 43 is in communication with the second gas outlet 162, the other end of the first flue gas pipeline 43 can be in communication with the external environment, one end of the second flue gas pipeline 44 is in communication with the second gas outlet 162, the other end of the second flue gas pipeline 44 can be in communication with the external environment, one end of the third flue gas pipeline 45 is in communication with the third gas outlet 132, the other end of the third flue gas pipeline 45 can be in communication with the external environment, the first shut-off valve 50 is arranged on the first gas pipeline 41, the second shut-off valve 51 is arranged on the second gas pipeline 42, the third shut-off valve 52 is arranged on the first flue gas pipeline 43, the fourth shut-off valve 53 is arranged on the second flue gas pipeline 44, the fifth shut-off valve 54 is arranged on the third flue gas pipeline 45, the first shut-off valve 50, the second shut-off valve 51, the third shut-off valve 52, the fourth shut-off valve 53 and the fifth shut-off valve 54 are signal connected with the controller, and the controller can control the opening and closing of the first shut-off valve 50, the second shut-off valve 51, the third shut-off valve 52, the fourth shut-off valve 53 and the fifth shut-off valve 54. By controlling the opening of the first shut-off valve 50 and the second shut-off valve 51, the communication of the first gas pipeline 41 and the second gas pipeline 42 with the treatment furnace 10 is realized, and the introduction of VOCs gas is realized. By controlling the opening of the third shut-off valve 52, the fourth shut-off valve 53 and the fifth shut-off valve 54, the communication of the first flue gas pipeline 43, the second flue gas pipeline 44 and the third flue gas pipeline 45 with the treatment furnace 10 is realized, and the discharge of flue gas is realized. In other embodiments, the controller can be omitted, and the opening and closing of the first shut-off valve 50, the second shut-off valve 51, the third shut-off valve 52, the fourth shut-off valve 53 and the fifth shut-off valve 54 can be realized by manual adjustment.

[0043] Optionally, a first refractory insulation layer is arranged on the inner wall of the third flue gas pipeline 45, so as to realize the discharge of high-temperature flue gas by the third flue gas pipeline and avoid the damage of the third flue gas pipeline 45 due to over-temperature. In this embodiment, the first refractory insulation layer is a refractory insulation lining layer, and in other embodiments, the first refractory insulation layer is a diatomite layer.

[0044] Optionally, the VOCs gas treatment device further comprises a chimney 90, the other end of the first flue gas pipeline 43, the other end of the second flue gas pipeline 44 and the other end of the third flue gas pipeline 45 are all communicated with the external environment through the chimney 90, so that the flue gas emission is more concentrated.

[0045] Further, the inner wall of the chimney 90 is provided with a third fireproof insulation layer 91, the chimney 90 shell is a carbon steel element, the third fireproof insulation layer 91 can adapt to the high and low temperature flue gas switching emission requirement, realize the chimney 90 emission of high temperature flue gas, avoid the chimney 90 inner wall from being damaged due to overtemperature. In the embodiment, the third fireproof insulation layer 91 is a fireproof insulation lining layer, in other embodiments, the third fireproof insulation layer 91 is a diatomite layer.

[0046] Further, the gas pipeline further comprises a third gas pipeline 46, the other end of the first gas pipeline 41 and the other end of the second gas pipeline 42 are both communicated with one end of the third gas pipeline 46, the other end of the third gas pipeline 46 is used for communicating with the VOCs gas source 20, the first concentration detection device 31 is arranged on the third gas pipeline 46, the air outlet side of the first fan 21 is communicated with the third gas pipeline 46, and the communication position of the air outlet side of the first fan 21 with the third gas pipeline 46 is located downstream of the first concentration detection device 31. The communication of the first gas pipeline 41 and the second gas pipeline 42 with the VOCs gas source 20 is realized, and the first concentration detection device 31 arranged on the third gas pipeline 46 can complete the detection of the VOCs gas concentration, which simplifies the VOCs gas concentration test steps and reduces the production cost of the VOCs gas treatment device. In other embodiments, the first gas pipeline 41 and the second gas pipeline 42 can be directly communicated with the VOCs gas source 20, and the first concentration detection device 31 is arranged on the first gas pipeline 41 and the second gas pipeline 42.

[0047] Optionally, the VOCs gas treatment device further comprises a gas mixer 7, the gas mixer 7 is arranged on the third gas pipeline 46, and the gas mixer 7 is located downstream of the communication position of the air outlet side of the first fan 21 with the third gas pipeline 46. The gas mixer 7 inside the Venturi structure, through the front and rear increased cyclone pieces, strengthens the gas mixing effect, so that the air and the VOCs gas are mixed more uniformly.

[0048] The traditional direct combustion method (TO) VOCs gas needs a certain time to mix with air after entering the furnace 13, and reaches the ignition temperature under the action of high-temperature flue gas, so it needs to stay in the furnace 13 for a long time to achieve high treatment efficiency, usually more than 1.5s. In this embodiment, the VOCs gas is mixed with air after premixing, and is fully mixed under the action of the Venturi structure and the swirl vane of the gas mixer 7, enters the first porous heat storage member 111 and is preheated, so that the temperature and concentration of the inlet gas are more uniform; the porous ceramic silicon carbide layer is close to the high-temperature furnace 13, and the temperature of the porous ceramic silicon carbide layer is basically the same as the furnace temperature. The preheated VOCs gas is dispersed into a small gas stream when passing through the porous ceramic silicon carbide layer, and rapidly oxidizes after contacting the porous ceramic silicon carbide layer, so the residence time of the VOCs gas in the furnace 13 can be shortened to 0.75s-1s, thereby indirectly reducing the space of the furnace 13 by more than 1 / 3, thereby reducing the floor space occupied by the device and the initial investment of the project.

[0049] Optionally, the concentration detection unit further comprises a second concentration detection device 32, which is arranged on the third gas pipeline 46 and located downstream of the gas mixer 7. The second concentration detection device 32 is used to detect the concentration of the VOCs gas diluted by the mixed air, so as to determine the concentration of the VOCs gas entering the first gas pipeline 41 and the second gas pipeline 42. In this embodiment, the second concentration detection device 32 is a gas concentration detector, and in other embodiments, the second concentration detection device 32 is a gas concentration test sensor.

[0050] Optionally, the VOCs gas treatment device further comprises a flow detection unit, which comprises a first flow detection device 33 and a second flow detection device 34. The first flow detection device 33 and the second flow detection device 34 are both arranged on the third gas pipeline 46. The first flow detection device 33 is arranged upstream of the communication position between the outlet side of the first fan 21 and the third gas pipeline 46, and the second flow detection device 34 is arranged downstream of the gas mixer 7. The first flow detection device 33 is used to measure the VOCs gas amount from the VOCs gas source 20, and the second flow detection device 34 is used to measure the VOCs gas amount after mixing with air. In this embodiment, the first flow detection device 33 is a flow meter, and in other embodiments, the first flow detection device 33 is a Pitot tube. In this embodiment, the second flow detection device 34 is a flow meter, and in other embodiments, the second flow detection device 34 is a Pitot tube.

[0051] Further, the control unit comprises a first flame arrester 56 and a second flame arrester 57, the first flame arrester 56 is arranged on the first gas pipeline 41, and the second flame arrester 57 is arranged on the second gas pipeline 42, so as to prevent the occurrence of fire in the treatment furnace 10 and avoid the spread of the flame through the first gas pipeline 41 and the second gas pipeline 42, thereby avoiding the occurrence of combustion explosion accidents of the device upstream of the treatment furnace 10.

[0052] Further, the VOCs gas treatment device further comprises a temperature detection unit, the temperature detection unit comprises a first temperature detection device 61, and the control unit further comprises a sixth cut-off valve 55, the measuring end of the first temperature detection device 61 is inserted into the hearth 13, the sixth cut-off valve 55 is arranged on the third gas pipeline 46, and the first temperature detection device 61 and the sixth cut-off valve 55 are both in signal connection with the controller. The controller can control the opening and closing of the sixth cut-off valve 55. When the first temperature detection device 61 detects that the temperature in the hearth 13 sharply rises, the controller controls the closing of the sixth cut-off valve 55, and after the first temperature detection device 61 detects that the temperature in the hearth 13 drops, the controller controls the opening of the sixth cut-off valve 55. In the embodiment, the first temperature detection device 61 is a thermocouple, and in other embodiments, the first temperature detection device 61 is a thermal resistance thermometer.

[0053] Optionally, the temperature detection unit further comprises a fourth temperature detection device 64, the measuring end of the fourth temperature detection device 64 is inserted into the hearth 13, the fourth temperature detection device 64 is arranged in interval with the first temperature detection device 61, and the fourth temperature detection device 64 is in signal connection with the controller. By arranging the fourth temperature detection device 64 in interval in the hearth 13, the monitoring of the temperature in the hearth 13 is more accurate. In the embodiment, the fourth temperature detection device 64 is a thermocouple, and in other embodiments, the fourth temperature detection device 64 is a thermal resistance thermometer.

[0054] Optionally, the temperature detection unit further comprises a second temperature detection device 62, a third temperature detection device 63, a fifth temperature detection device 65 and a sixth temperature detection device 66, the second temperature detection device 62 is inserted in the first chamber 16, the third temperature detection device 63 is inserted in the first heat storage chamber 11, the fifth temperature detection device 65 is inserted in the second heat storage chamber 15, and the sixth temperature detection device 66 is inserted in the second chamber 17, the second temperature detection device 62, the third temperature detection device 63, the fifth temperature detection device 65 and the sixth temperature detection device 66 are signal connected with the controller, the temperature in the first chamber 16, the first heat storage chamber 11, the second heat storage chamber 15 and the second chamber 17 is detected by the second temperature detection device 62, the third temperature detection device 63, the fifth temperature detection device 65 and the sixth temperature detection device 66 respectively, the concentration of the VOCs gas is judged by the fluctuation of the temperature, so that different combustion modes are selected to ensure the stable operation of the entire VOCs gas treatment device. In the embodiment, the second temperature detection device 62 is a thermocouple, and in other embodiments, the second temperature detection device 62 is a thermal resistance thermometer. In the embodiment, the third temperature detection device 63 is a thermocouple, and in other embodiments, the third temperature detection device 63 is a thermal resistance thermometer. In the embodiment, the fifth temperature detection device 65 is a thermocouple, and in other embodiments, the fifth temperature detection device 65 is a thermal resistance thermometer. In the embodiment, the sixth temperature detection device 66 is a thermocouple, and in other embodiments, the sixth temperature detection device 66 is a thermal resistance thermometer.

[0055] Optionally, the temperature detection device further comprises a seventh temperature detection device 67, the seventh temperature detection device 67 is inserted in the chimney 90 to detect the temperature of the discharged flue gas in real time. In the embodiment, the seventh temperature detection device 67 is a thermocouple, and in other embodiments, the seventh temperature detection device 67 is a thermal resistance thermometer.

[0056] Optionally, the VOCs gas treatment device further comprises a pressure detection device 68, a detection end of the pressure detection device 68 is inserted into the furnace chamber 13, the pressure detection device 68 and the fifth shut-off valve 54 are both signal connected with a controller, and the controller can control the opening and closing of the fifth shut-off valve 54. The pressure detection device 68 is used to monitor the change of the pressure in the furnace chamber 13 in real time. When the first regenerator 11 or the second regenerator 15 or the third shut-off valve 52 or the fourth shut-off valve 53 fails, the pressure in the furnace chamber 13 will increase, and an overpressure alarm will be generated. The fifth shut-off valve 54 is opened by the controller, the exhaust gas is discharged through the third flue gas pipeline 45, and the pressure in the furnace chamber 13 returns to the normal value. Then, the fifth shut-off valve 54 is closed by the controller, so that the flue gas is discharged in time, and explosion caused by excessive pressure in the furnace chamber 13 is avoided. In the embodiment, the pressure detection device 68 is a remote pressure gauge, and in other embodiments, the pressure detection device 68 is a pressure sensor or a pressure measuring instrument.

[0057] Optionally, the combustion supporting unit further comprises a burner 81, the fan unit further comprises a second fan 22, an outlet of the burner 81 is communicated with the furnace chamber 13, a first inlet of the burner 81 is used for introducing fuel, a second inlet of the burner 81 is communicated with an air outlet side of the second fan 22, and the second fan 22 is used for introducing external air. The fuel and the air are introduced into the burner 81, mixed, ignited, and used for heating the furnace chamber 13, so that the temperature in the furnace chamber 13 is increased. In the embodiment, a third air inlet 131 is arranged on the treatment furnace 10, and the outlet of the burner 81 is communicated with the third air inlet 131. In other embodiments, the outlet of the burner 81 is inserted into the furnace chamber 13. In the embodiment, the burner 81 is a low-nitrogen type, which can ensure that the NOx emission generated by combustion is low and no secondary pollution is generated. In other embodiments, the burner 81 is a common burner.

[0058] Further, the combustion supporting unit further comprises a solenoid valve 83 and a pressure reducing valve 82, the pipeline unit further comprises a gas pipeline 47, the solenoid valve 83 and the pressure reducing valve 82 are arranged on the gas pipeline 47, one end of the gas pipeline 47 is communicated with the first inlet of the burner 81, and the other end of the gas pipeline 47 is communicated with a gas source 84. The gas provided by the gas source 84 is reduced in pressure by the pressure reducing valve 82, and the gas enters the burner 81 by opening the solenoid valve 83, so that the combustion of the burner 81 is realized.

[0059] Optionally, the control unit further comprises a first regulating valve 58 and a second regulating valve 59, the inlet of the first regulating valve 58 is communicated with the VOCs gas source 20, the outlet of the first regulating valve 58 is communicated with the inlet of the gas mixer 7, the inlet of the second regulating valve 59 is communicated with the outlet side of the second fan 22, the outlet of the second regulating valve 59 is communicated with the second inlet of the burner 81, the gas amount of the VOCs gas entering the third gas pipeline 46 is regulated by the first regulating valve 58, and the air amount entering the gas pipeline 47 is regulated by the second regulating valve 59.

[0060] The use method of the VOCs gas treatment device provided by the embodiment is as follows:

[0061] S1. After the VOCs gas treatment device is started, the first fan 21 and the second fan 22 are started synchronously, and the frequency of the first fan 21 and the second fan 22 is gradually increased to 50 Hz, the blowing program is started, and the pipeline unit, the treatment furnace 10 and the chimney 90 are sequentially blown, after the blowing is completed, the frequency of the first fan 21 and the second fan 22 is reduced.

[0062] S2. The electromagnetic valve 83 on the gas pipeline 47 is opened, the gas and air mixed in the burner 81 are ignited, the hearth 13, the first super-enthalpy combustion chamber 12, the second super-enthalpy combustion chamber 14, the first regenerative chamber 11 and the second regenerative chamber 15 are continuously heated, and the temperature in the hearth 13 is increased to above 750℃.

[0063] S3. The sixth shut-off valve 55 is opened, and the opening of the first shut-off valve 50 and the second shut-off valve 51 is determined according to the detection result of the first concentration detection device 31.

[0064] S31. When the VOCs gas concentration is ≤15% VOL, the regenerative combustion + super-enthalpy combustion mode is adopted, the VOCs gas enters the treatment furnace 10 from the third gas pipeline 46 through the first shut-off valve 50 and is discharged from the third shut-off valve 52, when the temperature of the sixth temperature detection device 66 exceeds the limit value or exceeds a certain working time (one of the two), the inlet and outlet directions are switched, the VOCs gas enters the treatment furnace 10 from the third gas pipeline 46 through the second shut-off valve 51 and is discharged from the fourth shut-off valve 53.

[0065] S32. When VOCs gas concentration > 15% VOL, the combustion mode of direct combustion + super-enthalpy combustion is adopted, the amount of combustible components is calculated according to the VOCs gas flow measured by the first flow detection device 33 and the VOCs gas concentration detected by the first concentration detection device 31, the frequency of the first fan 21 is adjusted, the appropriate air is matched for combustion support, and the mixed VOCs gas enters the first chamber 16 and the second chamber 17 from the first cut-off valve 50 and the second cut-off valve 51 at the same time, at this time, the third cut-off valve 52 and the fourth cut-off valve 53 need to be closed, and the fifth cut-off valve 54 is opened, the generated CO2 and H2O in the hearth 13 are generated from the third flue gas pipeline 45 and are discharged into the chimney 90;

[0066] S4. During the operation of the VOCs gas treatment device, if the VOCs gas concentration fluctuates unstably or is in a low concentration working condition for a long time, the burner 81 needs to be started to maintain the temperature of the hearth 13 and ensure that the combustion reaction proceeds normally; if the VOCs exhaust gas concentration is high enough and the combustion releases heat to maintain the working temperature of the hearth 13, the burner 81 is adjusted to operate at a small power and is converted to a permanent fire state, so as to reduce the supplement of fuel gas and reduce the processing cost.

[0067] Obviously, the above embodiments of the utility model are only examples for clearly explaining the utility model, and are not the limitation of the embodiments of the utility model. For ordinary skilled in the art, various obvious changes, re-adjustment and replacement can be carried out without departing from the protection scope of the utility model. Here, it is not necessary and impossible to enumerate all the embodiments. Any modification, equivalent replacement and improvement within the spirit and principle of the utility model should be included in the protection scope of the utility model claim.

Claims

1. A VOCs gas treatment device, characterized by, The application relates to a VOCs (volatile organic compounds) treatment device. The device comprises a treatment furnace (10), a fan unit, a concentration detection unit and a combustion-supporting unit. The treatment furnace (10) comprises a first regenerator (11), a first super-enthalpy combustion chamber (12), a hearth (13), a second super-enthalpy combustion chamber (14), a second regenerator (15), a first air inlet (161), a second air inlet (171), a first air outlet (172), a second air outlet (162) and a third air outlet (132), the first regenerator (11), the first super-enthalpy combustion chamber (12), the hearth (13), the second super-enthalpy combustion chamber (14) and the second regenerator (15) are sequentially communicated, the first air inlet (161) and the second air outlet (162) are selectively communicated with the first regenerator (11), the second air inlet (171) and the first air outlet (172) are selectively communicated with the second regenerator (15), the third air outlet (132) is selectively communicated with the hearth (13), the first regenerator (11) is provided with a first porous regenerator (111), the second regenerator (15) is provided with a second porous regenerator (151), the first super-enthalpy combustion chamber (12) is provided with a first porous medium layer (121), and the second super-enthalpy combustion chamber (14) is provided with a second porous medium layer (141). The fan unit comprises a first fan (21), the air outlet side of the first fan (21) is communicated with the first air inlet (161) and the second air inlet (171), and the first fan (21) is used for introducing external air. The concentration detection unit comprises a first concentration detection device (31), the air inlet end of the first concentration detection device (31) is used for being communicated with a VOCs gas source (20), the air outlet end of the first concentration detection device (31) is communicated with the first air inlet (161) and the second air inlet (171). The combustion-supporting unit is used for providing heat to the inside of the hearth (13).

2. The VOCs gas treatment device according to claim 1, characterized in that, The VOCs gas treatment device further comprises a pipeline unit and a control unit, the pipeline unit comprises a first gas pipeline (41), a second gas pipeline (42), a first flue gas pipeline (43), a second flue gas pipeline (44) and a third flue gas pipeline (45), the control unit comprises a first shut-off valve (50), a second shut-off valve (51), a third shut-off valve (52), a fourth shut-off valve (53), a fifth shut-off valve (54), one end of the first gas pipeline (41) is communicated with the first gas inlet (161), the other end of the first gas pipeline (41) is communicated with the air outlet side of the first fan (21) and the gas outlet end of the first concentration detection device (31), one end of the second gas pipeline (42) is communicated with the second gas inlet (171), the other end of the second gas pipeline (42) is communicated with the air outlet side of the first fan (21) and the gas outlet end of the first concentration detection device (31), one end of the first flue gas pipeline (43) is communicated with the second gas outlet (162), the other end of the first flue gas pipeline (43) can be communicated with the external environment, one end of the second flue gas pipeline (44) is communicated with the second gas outlet (162), the other end of the second flue gas pipeline (44) can be communicated with the external environment, one end of the third flue gas pipeline (45) is communicated with the third gas outlet (132), the other end of the third flue gas pipeline (45) can be communicated with the external environment, the first shut-off valve (50) is arranged on the first gas pipeline (41), the second shut-off valve (51) is arranged on the second gas pipeline (42), the third shut-off valve (52) is arranged on the first flue gas pipeline (43), the fourth shut-off valve (53) is arranged on the second flue gas pipeline (44), and the fifth shut-off valve (54) is arranged on the third flue gas pipeline (45).

3. The VOCs gas treatment device according to claim 2, wherein, The gas pipeline further comprises a third gas pipeline (46), one end of the third gas pipeline (46) is communicated with the other end of the first gas pipeline (41) and the other end of the second gas pipeline (42), the other end of the third gas pipeline (46) is used for being communicated with the VOCs gas source (20), the first concentration detection device (31) is arranged on the third gas pipeline (46), the air outlet side of the first fan (21) is communicated with the third gas pipeline (46), and the communication position of the air outlet side of the first fan (21) with the third gas pipeline (46) is located downstream of the first concentration detection device (31).

4. The VOCs gas treatment device according to claim 3, wherein, The control unit comprises a first flame arrester (56) and a second flame arrester (57), the first flame arrester (56) is arranged on the first gas pipeline (41), and the second flame arrester (57) is arranged on the second gas pipeline (42).

5. The VOCs gas treatment device according to claim 4, wherein, The VOCs gas treatment device further comprises a temperature detection unit, the temperature detection unit comprises a first temperature detection device (61), the control unit further comprises a sixth cut-off valve (55) and a controller, a measuring end of the first temperature detection device (61) is inserted into the furnace (13), the sixth cut-off valve (55) is arranged on the third gas pipeline (46), and the first temperature detection device (61) and the sixth cut-off valve (55) are both in signal connection with the controller.

6. The VOCs gas treatment device according to claim 5, wherein, The VOCs gas treatment device further comprises a pressure detection device (68), a detection end of the pressure detection device (68) is inserted into the furnace (13), and the pressure detection device (68) and the fifth cut-off valve (54) are both in signal connection with the controller.

7. The VOCs gas treatment device according to claim 3, wherein, The VOCs gas treatment device further comprises a gas mixer (7), the gas mixer (7) is arranged on the third gas pipeline (46), and the gas mixer (7) is located downstream of a communication position of an air outlet side of the first fan (21) and the third gas pipeline (46).

8. The VOCs gas treatment device according to any one of claims 1-7, characterized in that, The combustion-supporting unit further comprises a burner (81), the fan unit further comprises a second fan (22), an outlet of the burner (81) is in communication with the furnace (13), a first inlet of the burner (81) is used for feeding fuel, a second inlet of the burner (81) is in communication with an air outlet side of the second fan (22), and the second fan (22) is used for feeding the external air.

9. The VOCs gas treatment device according to any one of claims 1-7, wherein, The first porous medium layer (121) and / or the second porous medium layer (141) is a porous ceramic silicon carbide layer.

10. The VOCs gas treatment device according to any one of claims 2-7, characterized in that, A first refractory heat insulation layer is arranged on an inner wall of the third flue gas pipeline (45).

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