Low-NOx multi-stage surface combustion and catalytic combustion device and waste gas treatment combustion system

Abstract

This invention provides a low-NOx multi-stage surface combustion and catalytic combustion device and a waste gas treatment combustion system. The low-NOx multi-stage surface combustion and catalytic combustion device includes: a shell; a premixed low-NOx burner, one end of which is inserted into the shell; a combustion structure located inside the shell and above the premixed low-NOx burner; a heat storage body located inside the shell and above the combustion structure; a catalytic combustion honeycomb structure located inside the shell and above the heat storage body; a combustion air inlet connected to the interior of the shell and located below the premixed low-NOx burner; and a discharge device including a discharge pipe, one end of which is connected to the interior of the shell and located above the catalytic combustion honeycomb structure. This invention achieves a treatment method combining low-NOx surface combustion and catalytic combustion, enabling the combustion and oxidation treatment of small-flow waste gas without the need for high-calorific-value fuel as combustion aid. It has advantages such as low energy consumption, low flue gas emissions, and high waste gas treatment rate.

Description

Technical Field

[0001] This invention relates to the field of combustion equipment technology, and in particular to a low-NOx multi-stage surface combustion and catalytic combustion device and a waste gas treatment combustion system. Background Technology

[0002] Traditional treatment methods for small-volume waste gases, such as breathing gases from storage tanks for liquid oil products in petrochemical and coal chemical industries, include combustion, condensation, biological, adsorption, chemical absorption, and combined methods. The choice of treatment technology generally depends on a comprehensive consideration of the gas source, pollutant composition, concentration, volume, treatment requirements, operation, safety, and technological adaptability.

[0003] Generally, the treatment of large volumes of chemical waste gas usually involves direct incineration oxidation before discharge. Direct incineration uses solid, liquid, or natural gas as the combustion medium, and its working principle is similar to that of waste incinerators and enclosed internal combustion flares. It is mainly suitable for the treatment of high-concentration or combustible exhaust gases. For low-concentration or non-combustible waste gases, the consumption of high-calorific-value fuels used for incineration may even exceed the amount of waste gas emitted, which is very uneconomical. Not only does it consume fuel, but it also significantly increases the amount of flue gas emitted, resulting in a relatively low waste gas treatment rate. Summary of the Invention

[0004] The purpose of this invention is to provide a low-NOx multi-stage surface combustion and catalytic combustion device and a waste gas treatment combustion system, which has the advantages of not requiring high-calorific-value fuel as combustion aid, low energy consumption, low flue gas emissions, and high waste gas treatment rate.

[0005] To address the problems in the prior art, in a first aspect, the present invention provides a low-NOx multi-stage surface combustion and catalytic combustion device, comprising:

[0006] case;

[0007] A premixed low-NOx burner, one end of which is inserted into the housing;

[0008] The incineration structure is located inside the shell and above the premixed low-NOx burner;

[0009] The heat storage body is located inside the shell and above the incineration structure;

[0010] A catalytic combustion honeycomb structure is located inside the shell and above the heat storage body;

[0011] The combustion air inlet is connected to the interior of the housing and is located below the premixed low-NOx burner;

[0012] The emission device includes an emission pipe, one end of which is connected to the interior of the housing and located above the catalytic combustion honeycomb structure.

[0013] Optionally, the incineration structure includes:

[0014] A primary honeycomb heating element tray is located inside the housing and above the premixed low-NOx burner;

[0015] A primary, circuitous resistive heating element is located at least partially within the housing and above the primary honeycomb heating element tray.

[0016] The primary oxidation chamber is located inside the housing and above the primary meandering resistive heating element;

[0017] The secondary honeycomb heating element tray is located inside the housing and above the primary oxidation chamber;

[0018] The secondary circuitous resistive heating element is at least partially located within the housing and above the secondary honeycomb heating element tray;

[0019] The secondary oxidation chamber is located inside the housing and above the secondary circuitous resistive heating element; the heat storage element is located above the secondary oxidation chamber.

[0020] Optionally, the heat storage body includes a foam ceramic heat storage body, and / or both the primary meandering resistance heating element and the secondary meandering resistance heating element include a grate-shaped meandering resistance heating element, and / or the discharge device further includes a rain cap located at the end of the discharge pipe away from the housing.

[0021] Optionally, both the first-stage detour-type resistive heating element and the second-stage detour-type resistive heating element include:

[0022] A mesh-like protective sleeve is located inside the housing and above the primary honeycomb heating element tray or the secondary honeycomb heating element tray;

[0023] A meandering heating element is located inside the mesh-like protective sleeve and includes a first end and a second end opposite to each other.

[0024] A refractory fiber structure is located on the outer wall of the shell;

[0025] The first lead-out device extends from the surface of the heat-resistant fiber structure away from the housing into the heat-resistant fiber structure;

[0026] The second lead-out device extends from the surface of the heat-resistant fiber structure away from the housing into the heat-resistant fiber structure;

[0027] The first connecting rod has one end connected to the first end of the meandering heating element, and the other end led out to the outside of the housing via the first connecting rod lead-out device.

[0028] The second connecting rod has one end connected to the second end of the meandering heating element, and the other end led out to the outside of the housing via the second connecting rod lead-out device.

[0029] Optionally, it also includes:

[0030] The explosion-proof box is located on the side of the fire-resistant fiber structure away from the shell, and is fitted around the first lead-out device and the second lead-out device.

[0031] Optionally, the premixed low-NOx burner includes:

[0032] The distribution chamber is located within the housing;

[0033] The air intake pipe has one end connected to the distribution chamber and the other end extending to the outside of the housing;

[0034] Multiple branch jet pipes are located inside the housing and connected to the distribution chamber; each branch jet pipe is provided with multiple nozzles with the same jet direction.

[0035] Secondly, the present invention also provides a low-NOx internal combustion exhaust gas treatment combustion system, comprising:

[0036] The low-NOx multi-stage surface combustion and catalytic combustion device as described in the first aspect;

[0037] An exhaust gas piping system includes an exhaust gas piping and a pressure switch; one end of the exhaust gas piping is connected to the premixed low-NOx burner; the pressure switch is located on the exhaust gas piping.

[0038] A combustion-supporting air system is connected to the combustion-supporting air inlet.

[0039] A temperature detection device is inserted into the housing and located on the side of the catalytic combustion honeycomb body away from the heat storage body;

[0040] A power supply system is connected to the incineration structure;

[0041] The control device is connected to at least the temperature detection device, the power supply system, and the pressure switch.

[0042] Optionally, the exhaust gas piping system further includes:

[0043] A manual ball valve is located on the exhaust gas pipeline and on the side of the pressure switch away from the premixed low-NOx burner;

[0044] A pipeline flame arrester is located on the exhaust gas pipeline and between the manual ball valve and the pressure switch;

[0045] A manual flow regulating valve is located on the exhaust gas pipeline and between the pressure switch and the premixed low-NOx burner;

[0046] A dual-cut-off explosion-proof solenoid valve is located on the exhaust gas pipeline and between the manual flow regulating valve and the premixed low-NOx burner.

[0047] Optionally, the combustion-supporting air system includes:

[0048] Fan;

[0049] The combustion air duct is connected at one end to the blower and at the other end to the combustion air inlet;

[0050] A pipeline switch, including a differential pressure switch or a low-pressure switch, is located on the combustion air pipeline.

[0051] Optionally, the power supply system includes:

[0052] DC power supply;

[0053] The electric heating element power supply is connected to the DC power supply, the control device, and the incineration structure;

[0054] A current detection and display device is located on the connection line between the power supply of the heating element and the combustion structure;

[0055] A voltage detection and display device is located on the connection line between the power supply of the heating element and the combustion structure.

[0056] Optionally, the control device includes:

[0057] A temperature controller is connected to the temperature detection device;

[0058] A programmable logic controller is connected to both the temperature controller and the power supply for the heating element;

[0059] An automatic / pressure control device is connected to both the programmable logic controller and the pressure switch.

[0060] Optionally, it also includes:

[0061] The exhaust gas pretreatment system is connected to the end of the exhaust gas pipeline furthest from the premixed low-NOx burner.

[0062] As described above, the low-NOx multi-stage surface combustion and catalytic combustion device and waste gas treatment combustion system of the present invention have the following beneficial effects: In the low-NOx multi-stage surface combustion and catalytic combustion device of the present invention, by setting a combustion structure, a heat storage body and a catalytic combustion honeycomb body, a treatment method combining low-NOx surface combustion and catalytic combustion can be realized. It can achieve the combustion oxidation treatment of small flow waste gas without the need for high-calorific-value fuel as combustion aid, and has the advantages of low energy consumption, low flue gas emission and high waste gas treatment rate. Attached Figure Description

[0063] Figure 1 This is a cross-sectional structural diagram of the low-NOx multi-stage surface combustion and catalytic combustion device provided in Embodiment 1 of the present invention.

[0064] Figure 2 This is a top view of the premixed low-NOx burner in the low-NOx multi-stage surface combustion and catalytic combustion device provided in Embodiment 1 of the present invention.

[0065] Figure 3 This is a schematic diagram of the cross-sectional structure of the premixed low-NOx burner in the low-NOx multi-stage surface combustion and catalytic combustion device provided in Embodiment 1 of the present invention.

[0066] Figure 4 This is a top view schematic diagram of the first-stage honeycomb electric heating element tray and the first-stage detour-type resistive heating element in the low-NOx multi-stage surface combustion and catalytic combustion device provided in Embodiment 1 of the present invention.

[0067] Figure 5 This is a top view of the first-stage honeycomb heating element tray in the low-NOx multi-stage surface combustion and catalytic combustion device provided in Embodiment 1 of the present invention.

[0068] Figure 6 For along Figure 5 A schematic diagram of the cross-sectional structure along the AA direction.

[0069] Figure 7 This is a top view of the catalytic combustion honeycomb structure in the low-NOx multi-stage surface combustion and catalytic combustion device provided in Embodiment 1 of the present invention.

[0070] Figure 8 This is a schematic diagram of the low-NOx internal combustion exhaust gas treatment combustion system provided in Embodiment 2 of the present invention.

[0071] Component labeling descriptions: 1. Low-NOx multi-stage surface combustion and catalytic combustion device; 10. Shell; 11. Premixed low-NOx burner; 110. Distribution chamber; 111. Inlet pipe; 112. Branch jet pipe; 113. Nozzle; 12. Combustion structure; 120. First-stage honeycomb heating element tray; 121. First-stage circuitous resistance heating element; 122. First-stage oxidation chamber; 123. Second-stage honeycomb heating element tray; 124. Second-stage circuitous resistance heating element; 125. Second-stage oxidation chamber; 1210. Mesh casing; 1211. Circuitous heating element; 1212. Refractory fiber structure; 1213. First connecting rod lead-out device; 1214. Second connecting rod lead-out device; 1 215. First connecting rod; 1216. Second connecting rod; 13. Heat storage body; 14. Catalytic combustion honeycomb body; 15. Combustion air inlet; 16. Exhaust pipe; 17. Explosion-proof box; 2. Exhaust gas pipeline system; 20. Exhaust gas pipeline; 21. Pressure switch; 22. Manual ball valve; 23. Pipeline flame arrester; 24. Manual flow regulating valve; 25. Double-cut-off explosion-proof solenoid valve; 3. Combustion air system; 30. Fan; 31. Combustion air pipeline; 32. Pipeline switch; 4. Temperature detection device; 5. Power supply system; 51. DC power supply; 52. Heating element power supply; 6. Control device; 61. Temperature controller; 62. Programmable logic controller; 63. Automatic / pressure control device; 7. Exhaust gas pretreatment system. Detailed Implementation

[0072] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0073] The preferred embodiments described below are merely examples, and other obvious variations will be apparent to those skilled in the art. The basic principles of the invention defined in the following description can be applied to other embodiments, modifications, improvements, equivalents, and other technical solutions that do not depart from the spirit and scope of the invention.

[0074] Those skilled in the art should understand that, in the disclosure of this invention, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as limiting this invention.

[0075] Example 1

[0076] Please see Figure 1 As shown, the present invention provides a low-NOx multi-stage surface combustion and catalytic combustion device, wherein the low-NOx multi-stage surface combustion and catalytic combustion device 1 includes:

[0077] Casing 10;

[0078] A premixed low-NOx burner 11, one end of which is inserted into the housing 10;

[0079] The combustion structure 12 is located inside the housing 10 and above the premixed low-NOx burner 11;

[0080] Heat storage body 13, which is located inside the shell 10 and above the incineration structure 12;

[0081] Catalytic combustion honeycomb structure 14 is located inside the housing 10 and above the heat storage body 13;

[0082] Combustion air inlet 15, which is connected to the interior of the housing 10 and is located below the premixed low-NOx burner 11;

[0083] The emission device includes an emission pipe 16, one end of which is connected to the interior of the housing 10 and located above the catalytic combustion honeycomb body 14.

[0084] In the low-NOx multi-stage surface combustion and catalytic combustion device 1 of the present invention, by setting the combustion structure 12, the heat storage body 13 and the catalytic combustion honeycomb body 14, a treatment method combining low-NOx surface combustion and catalytic combustion can be realized. It can achieve the combustion and oxidation treatment of small flow of waste gas without the need for high-calorific-value fuel as combustion aid, and has the advantages of low energy consumption, low flue gas emission and high waste gas treatment rate.

[0085] As an example, please continue reading Figure 1 The incineration structure 12 can be a two-stage incineration structure. Specifically, the incineration structure 12 may include:

[0086] A primary honeycomb heating element tray 120 is located inside the housing 10 and above the premixed low-NOx burner 11.

[0087] A primary winding resistive heating element 121 is located at least partially within the housing 10 and above the primary honeycomb heating element tray 120.

[0088] A primary oxidation chamber 122 is located inside the housing 10 and above the primary detour resistive heating element 121.

[0089] A secondary honeycomb heating element tray 123 is located inside the housing 10 and above the primary oxidation chamber 122;

[0090] A secondary circuitous resistive heating element 124 is located at least partially within the housing 10 and above the secondary honeycomb heating element tray 123.

[0091] The secondary oxidation chamber 125 is located inside the housing 10 and above the secondary circuitous resistive heating element 124; the heat storage element 13 is located above the secondary oxidation chamber 125.

[0092] As an example, the primary honeycomb heating element tray 120, the primary meandering resistive heating element 121, the primary oxidation chamber 122, the secondary honeycomb heating element tray 123, the secondary meandering resistive heating element 124, and the secondary oxidation chamber 125 are arranged in a stacked manner from bottom to top.

[0093] As an example, the first-stage meandering resistive heating element 121 may include a grate-shaped meandering resistive heating element, and the second-stage meandering resistive heating element may include a grate-shaped meandering resistive heating element.

[0094] As an example, the structure of the primary honeycomb heating element tray 120 is the same as that of the secondary honeycomb heating element tray 123. The shapes of the primary honeycomb heating element tray 120 and the secondary honeycomb heating element tray 123 can be the same as the internal shape of the housing 10. The top view of the primary honeycomb heating element tray 120 is shown below. Figure 5 As shown, the cross-sectional view is as follows Figure 6 As shown, Figure 5 As shown, the shape of the primary honeycomb heating element tray 120 and the shape of the secondary honeycomb heating element tray 123 can both be circular.

[0095] As an example, the heat storage body 13 may include a foam ceramic heat storage body. Specifically, the heat storage body 13 may include, but is not limited to, an alumina foam ceramic heat storage body. The heat storage body 13 has three-dimensional pores.

[0096] As an example, the porosity of the heat storage body 13 can be 0.5 to 0.9. Specifically, the porosity of the heat storage body 13 can be 0.5, 0.6, 0.7, 0.8, or 0.9, etc. The heat storage body 13 has a long-term operating temperature of not less than 1400℃, high strength, and good thermal shock resistance.

[0097] As an example, the ignition temperature of the catalytic combustion honeycomb 14 is less than or equal to 200°C, the oxidation conversion rate is greater than or equal to 95%, the pore density can be 200 cpsi (number of pores per square inch) to 400 cpsi, and the compressive strength is greater than or equal to 8 MPa.

[0098] As an example, the heat storage body 13 can be a single layer or multiple layers, such as 2 to 4 layers; specifically, the number of layers of the heat storage body 13 can be 1, 2, 3, or 4 layers, etc. Of course, in other examples, the number of layers of the heat storage body 13 is not limited to this, and other more layers can be set according to actual needs.

[0099] As an example, the catalytic combustion honeycomb body 14 can be a single layer or multiple layers, and the multiple layers of the catalytic combustion honeycomb body 14 can be stacked.

[0100] As an example, the primary honeycomb heating element tray 120, the primary circuitous resistive heating element 121, the primary oxidation chamber 122, the secondary honeycomb heating element tray 123, the secondary circuitous resistive heating element 124, the secondary oxidation chamber 125, the heat storage element 13, and the catalytic combustion honeycomb body 14 can be made into an integrated, one-piece, drawer-type replaceable and maintainable structure. That is, the primary honeycomb heating element tray 120, the primary circuitous resistive heating element 121, the primary oxidation chamber 122, the secondary honeycomb heating element tray 123, the secondary circuitous resistive heating element 124, the secondary oxidation chamber 125, the heat storage element 13, and the catalytic combustion honeycomb body 14 are independent of each other and can be removed and replaced separately from the housing 10.

[0101] As an example, the shape of the catalytic combustion honeycomb 14 can be the same as the shape inside the shell 10, such as... Figure 7 As shown, the catalytic combustion honeycomb body 14 is circular in shape.

[0102] As an example, the discharge device may also include a rain cap (not shown) located at one end of the discharge pipe 16 away from the housing 10.

[0103] As an example, the structures of the first-stage detour resistor-type heating element 121 and the second-stage detour resistor-type heating element 124 can be completely identical. Please refer to [link / reference]. Figure 4The primary detour resistor-type heating element 121 and the secondary detour resistor-type heating element 124 may each include:

[0104] A mesh-like protective sleeve 1210 is located inside the housing 10 and above the primary honeycomb heating element tray 120 or the secondary honeycomb heating element tray 123.

[0105] A meandering heating element 1211 is located inside the mesh-like protective sleeve 1210. The meandering heating element 1211 includes a first end and a second end opposite to each other.

[0106] A refractory fiber structure 1212 is located on the outer wall of the shell 10;

[0107] First connector lead-out device 1213, the first connector lead-out structure 1213 extends from the surface of the heat-resistant fiber structure 1212 away from the housing 10 into the heat-resistant fiber structure 1212;

[0108] The second connector lead-out device 1214 extends from the surface of the heat-resistant fiber structure 1212 away from the housing 10 into the heat-resistant fiber structure 1212.

[0109] The first connecting rod 1215 has one end connected to the first end of the meandering heating element 1211, and the other end led out to the outside of the housing 10 via the first connecting rod lead-out device 1213.

[0110] The second connector 1216 has one end connected to the second end of the meandering heating element 1211, and the other end led out to the outside of the housing 10 via the second connector lead-out device 1214.

[0111] As an example, the meandering heating element 1211 can be a Kanthal heating alloy strip with a power-related surface load of less than 1.63 W / cm². 2 ~2.2W / cm 2 And it allows the primary oxidation chamber 122 and the secondary oxidation chamber 125 located thereon to reach 900°C within a rated time.

[0112] As an example, please continue reading Figure 1 The low-NOx multi-stage surface combustion and catalytic combustion device may further include:

[0113] The explosion-proof box 17 is located on the side of the refractory fiber structure 1212 away from the shell 10, and is fitted around the first lead-out device 1213 and the second lead-out device 1214; that is, the first lead-out device 1213 and the second lead-out device 1214 are both located inside the explosion-proof box 17.

[0114] As an example, the premixed low-NOx burner 11 can be a fine-stream diffusion premixed low-NOx burner.

[0115] For example, please refer to Figure 2 and Figure 3 The premixed low-NOx burner 11 may include:

[0116] Distribution chamber 110, which is located inside the housing 10;

[0117] An intake pipe 111, one end of which is connected to the distribution chamber 110, and the other end extends to the outside of the housing 10;

[0118] Multiple branch jet pipes 112 are located inside the housing 10 and are connected to the distribution chamber 110; each branch jet pipe 112 is provided with multiple nozzles 113 with the same jet direction.

[0119] As an example, the distribution chamber 110 can be an annular hollow distribution chamber. Figure 2 The distribution chamber 110 is taken as an example as a circular hollow distribution chamber.

[0120] As an example, the number of branch jet pipes 112 can be 6 to 12. Specifically, the number of branch jet pipes 112 can be 6, 7, 8, 9, 10, 11, or 12, etc. The number of nozzles 113 on each branch jet pipe 112 can be 3 to 8. Specifically, the number of nozzles 113 on each branch jet pipe 112 can be 3, 4, 5, 6, 7, or 8, etc.

[0121] As an example, multiple jet lines 112 may all be located within the distribution chamber 110 and arranged parallel to and spaced apart from the inner side of the distribution chamber 110.

[0122] As an example, the jet direction of the nozzles 113 of each of the said branch jet pipes 112 can all be directed toward the incineration structure 12.

[0123] As an example, the number of nozzles 113 on each of the branch jet pipes 112 can be set according to actual needs, and is not limited here. The plurality of nozzles 113 on each of the branch jet pipes 112 can be arranged at equal intervals.

[0124] As an example, one end of the discharge pipe 16 can be connected to the housing 10 via a flange. The outlet diameter of the discharge pipe 16 can be naturally determined based on the maximum wind speed it can withstand at the installation site, and is not specifically limited here.

[0125] The low-NOx multi-stage surface combustion and catalytic combustion device of the present invention is suitable for the combustion of small-flow-rate waste gas, with a flow rate range of up to 5 Nm³. 3 / h~50Nm 3 / h; exhaust gas can include flammable and non-flammable exhaust gases, such as oil tank breathing gas, fermentation exhaust gas or biogas.

[0126] The working principle of the low-NOx multi-stage surface combustion and catalytic combustion device of the present invention is as follows: After the exhaust gas enters the premixed low-NOx burner 11, it is ejected from the nozzle 113 on the branch jet pipe 112 and mixed with the co-current combustion air entering the combustion air inlet 15. Then, it enters the first-stage honeycomb electric heating element tray 120. After being divided and guided by hundreds of straight honeycomb holes in the first-stage honeycomb electric heating element tray 120, it comes into contact with the surface of the first-stage detour resistive heating element 121, which is located at a high temperature of 1100°C on the first-stage honeycomb electric heating element tray 120, and flows through the first-stage detour resistive heating element 121. The organic components in the exhaust gas are ignited and the first-stage combustion is maintained in the first-stage oxidation chamber 122. The temperature in the first-stage oxidation chamber 122 can reach 900°C. The flame from the primary combustion of the exhaust gas enters the secondary honeycomb heating element tray 123. Through hundreds of through-holes in the tray, the flame is segmented and guided upwards, contacting the surface of the secondary circuitous resistive heating element 124 at 1100°C and flowing through it. This maintains the oxidation temperature of the exhaust gas within the secondary oxidation chamber 125, extending its residence time and ensuring complete combustion. The high-temperature flue gas and exhaust flame in the secondary oxidation chamber 125 further enter the heat storage body 13. During surface combustion, staged combustion, and flame cutting within the three-dimensional pores of the heat storage body 13, heat is returned to the heat storage body 13. Simultaneously, the flow rate of the exhaust gas and high-temperature flue gas is further slowed, increasing the residence time of unburned exhaust gas in the high-temperature zone. After passing through the heat storage body 13, the exhaust gas and flue gas enter the catalytic combustion honeycomb body 14 for catalytic combustion. Catalytic combustion is a typical gas-solid catalytic reaction in which active oxygen participates in deep oxidation. As a VOCs catalytic combustion technology, it has a low combustion temperature (generally below 350℃), no open flame, and no nitrogen oxides (NOx). After the waste gas is treated, there are no secondary pollutants. It can achieve deep oxidation treatment of the released waste gas, improve the waste gas treatment rate, and can achieve a combustion oxidation treatment rate of more than 99.5%, and achieve low nitrogen and harmless emissions.

[0127] Example 2

[0128] Please combine Figures 1 to 7 See Figure 8 The present invention also provides a low-NOx internal combustion exhaust gas treatment and combustion system, wherein the low-NOx internal combustion exhaust gas treatment and combustion system may include:

[0129] The low-NOx multi-stage surface combustion and catalytic combustion device 1 as described in Example 1;

[0130] The exhaust gas piping system 2 may include an exhaust gas piping 20 and a pressure switch 21; one end of the exhaust gas piping 20 is connected to the premixed low-NOx burner 11; the pressure switch 21 is located on the exhaust gas piping 20.

[0131] Combustion-supporting air system 3, wherein the combustion-supporting air system 3 is connected to the combustion-supporting air inlet 15;

[0132] Temperature detection device 4 is inserted into the housing 10 and is located on the side of the catalytic combustion honeycomb body 14 away from the heat storage body 13;

[0133] Power supply system 5, which is connected to the incineration structure 12;

[0134] The control device 6 is connected to at least the temperature detection device 4, the power supply system 5, and the pressure switch 21.

[0135] Specifically, the end of the exhaust gas pipeline 20 that is connected to the premixed low-NOx burner 11 is specifically connected to the intake pipeline 111 in the premixed low-NOx burner 11.

[0136] As an example, the exhaust gas piping system 2 may further include:

[0137] Manual ball valve 22, which is located on the exhaust gas pipeline 20 and on the side of the pressure switch 21 away from the premixed low-NOx burner 11;

[0138] Pipeline flame arrester 23, the pipeline flame arrester 23 is located on the exhaust gas pipeline 20 and between the manual ball valve 22 and the pressure switch 21;

[0139] Manual flow regulating valve 24, which is located on the exhaust gas pipeline 20 and between the pressure switch 21 and the premixed low-NOx burner 11;

[0140] A dual-cut-off explosion-proof solenoid valve 25 is located on the exhaust gas pipeline 20 and between the manual flow regulating valve 24 and the premixed low-NOx burner 11.

[0141] As an example, the exhaust gas pipeline system 2 may further include connecting hoses or expansion joints, and the exhaust gas pipeline 20 may be in multiple sections, which may be connected by the connecting hoses or expansion joints. Specifically, the exhaust gas pipeline 20 and the connecting hoses or expansion joints may be installed by means of flanges or threaded connections.

[0142] In other examples, the pressure switch 21 can also be replaced with a pressure transmitter.

[0143] As an example, the combustion-supporting air system 3 may include:

[0144] Fan 30;

[0145] Combustion-supporting air duct 31, one end of which is connected to the fan 30 and the other end of which is connected to the combustion-supporting air inlet 15;

[0146] Pipeline switch 32, which may include a differential pressure switch or a low-pressure switch, is located on the combustion air pipeline 31.

[0147] As an example, the pipeline switch 32 is used for combustion air volume regulation and airflow protection.

[0148] As an example, the fan 30 may include, but is not limited to, a low-noise fan.

[0149] As an example, the power supply system 5 may include:

[0150] DC power supply 51;

[0151] The electric heating element power supply 52 is connected to the DC power supply 51, the control device 6, and the incineration structure 12.

[0152] Current detection and display device (i.e.) Figure 8 (Ammeters A1 and A2 in the middle), the current detection device is located on the connection line between the electric heating element power supply 52 and the incineration structure 12;

[0153] Voltage detection and display device (i.e.) Figure 8 The voltage detection and display device (V1 and V2 in the middle) is located on the connection line between the electric heating element power supply 52 and the incineration structure 12.

[0154] As an example, the DC power supply 51 can convert 220V 50Hz voltage to power the heating element power supply 52. ​​That is, the power supply voltage provided by the heating element power supply 52 is a DC voltage with a low, safe voltage value, obtained by converting 220V single-phase 50Hz AC power. The voltage or current output by the heating element power supply 52 is adjustable (to achieve adjustable power of the circuitous heating element 1211). The operating voltage provided by the heating element power supply 52 is a safe voltage.

[0155] As an example, the heating element power supply 52 may have at least two sets of external power supply terminals; of course, in other examples, the heating element power supply 52 may also include three sets of external power supply terminals to achieve two-in-one standby.

[0156] As an example, the heating element power supply 52 can be connected to the detour heating element 1211 in the first-stage detour resistive heating element 121 and the second-stage detour resistive heating element 124; specifically, it can be connected to the detour heating element 1211 via the first terminal 1215 and the second terminal 1216.

[0157] As an example, the current detection and display device can monitor whether the primary detour resistor heating element 121 and the secondary detour resistor heating element 124 are heating normally, and the voltage detection and display device is used to monitor the actual working power of the primary detour resistor heating element 121 and the secondary detour resistor heating element 124, which is equivalent to the "flame detection" of a traditional burner flame-keeping lamp.

[0158] As an example, the power supply system 5 may also include a voltage regulator (not shown) that can be electrically connected to the power supply 52 of the heating element.

[0159] As an example, the power supply system 5 may also include an alarm (not shown) for issuing alarm information when an anomaly occurs.

[0160] As an example, the control device 6 may include:

[0161] Temperature controller 61, which is connected to the temperature detection device 4;

[0162] A programmable logic controller 62 is provided, which is connected to both the temperature controller 61 and the power supply 52 for the heating element.

[0163] Automatic / pressure control device 63, which is connected to both the programmable logic controller 62 and the pressure switch 21.

[0164] As an example, the control device 6 can be an explosion-proof field electrical control cabinet. The control device 6 can include a control cabinet, the temperature controller 61 can be located on the control cabinet, and the programmable logic controller 62 and the automatic / pressure control device 63 can be inside the control cabinet.

[0165] As an example, the programmable logic controller 62 can also be connected to the fan 30 to control the operation of the fan 30.

[0166] The exhaust gas pipeline system 2 can switch between two ignition and venting modes, namely pressure control and automatic, based on the automatic / pressure control device 63. The exhaust gas pipeline 20 realizes the transportation of exhaust gas, and the exhaust gas pipeline system 2 can operate pressure triggering and pressure protection, flow regulation, and flame arrestor functions. Both the pressure control mode and the automatic mode can be operated locally or remotely, enabling unattended and safe operation.

[0167] As an example, the low-NOx internal combustion exhaust gas treatment system may further include:

[0168] The exhaust gas pretreatment system 7 is connected to the end of the exhaust gas pipeline 20 away from the premixed low-NOx burner 11.

[0169] As an example, the exhaust gas pretreatment system 7 may consist of all or part of a hood-type exhaust gas collector (not shown), a filter (not shown), a gas-liquid separator (not shown), a water seal tank (not shown), and a suction and pressurization fan (not shown). Specifically, the exhaust gas outlet pipe and the inlet of the hood-type collector are connected in a sleeve-type non-closed connection. Organic or toxic exhaust gas is drawn in from the exhaust gas outlet pipe through the hood-type collector and then by the suction and pressurization fan. After passing through the filter and the gas-liquid separator (which can remove the gas if it is dry), it enters the exhaust gas pipeline 20 from the exhaust gas external interface of the exhaust gas pretreatment system 7. The suction capacity of the suction and pressurization fan is greater than the exhaust gas discharge capacity of the exhaust gas outlet pipe, which can form a constant suction negative pressure at the exhaust gas suction port to ensure that the exhaust gas does not escape and that the exhaust gas and the air at the suction port are sent into the exhaust gas pipeline 20 at a stable flow rate and a stable pressure by the suction and pressurization fan.

[0170] As an example, one end of the exhaust gas pipeline 20 can be connected to the exhaust gas external interface of the exhaust gas pretreatment system 7, requiring separate construction and installation of a low-pressure fluid steel pipe of suitable diameter and length for connection; the other end of the exhaust gas pipeline 20 can be connected to the air inlet pipeline 111 in the premixed low-NOx burner 11, specifically, it can be connected to the air inlet of the air inlet pipeline 111 through an exhaust gas inlet flange. The exhaust gas pipeline 20 is an auxiliary and randomly matched pipeline "before the nozzle" of the low-NOx multi-stage surface combustion and catalytic combustion device 1.

[0171] As an example, the temperature detection device 4 may include, but is not limited to, thermocouples. Specifically, the temperature detection device 4 may include, but is not limited to, armored thermocouples. The temperature detection device 4 is used to monitor the operating status of the low-NOx multi-stage surface combustion and catalytic combustion device 1 and send real-time temperature detection signals to the temperature controller 61 to realize the control logic to control the power supply and power-off timing of the heating element power supply 52.

[0172] All components in the low-NOx internal combustion exhaust gas treatment combustion system of the present invention are selected according to explosion-proof design, and the protection level is suitable for outdoor rain and snow weather.

[0173] The low-NOx internal combustion exhaust gas treatment system of the present invention can be set to two operating modes:

[0174] In Mode 1, the pressure control mode triggers the venting and incineration process. When the pressure in the exhaust gas pipeline system 2 reaches the set value, the pressure switch 21 provides a signal, and the control device 6 controls the power supply system 5 to energize the detour heating element 1211 in the primary detour resistor heating element 121 and the secondary detour resistor heating element 124, thus initiating the automatic ignition and operation process.

[0175] Mode 2: Automatic mode control of the venting and incineration process. When the low-NOx internal combustion exhaust gas treatment system receives the venting operation signal, it detects the venting gas pressure. If the pressure exceeds the low-pressure protection value, the blower 30 is turned on to purge for a certain period of time. Then, the control device 6 controls the power supply system 5 to energize the detour heating element 1211 in the first-stage detour resistive heating element 121 and the second-stage detour resistive heating element 124. The detour heating element 1211 heats up for a certain period of time (the time can be set; the surface temperature of the detour heating element 1211 can be raised to about 1100℃). Then, the switch in the exhaust gas pipeline system 2 is turned on, and the incineration oxidation operation stage begins.

[0176] Both of the above-mentioned working modes of the low-NOx internal combustion exhaust gas treatment combustion system of the present invention can achieve unattended operation.

[0177] The low-NOx internal combustion exhaust gas treatment combustion system of the present invention can realize the combustion oxidation treatment of small flow exhaust gas without auxiliary combustion gas and accompanying combustion gas; realize the treatment method of combining low-NOx surface combustion and catalytic combustion; realize fully automatic unattended operation; and is suitable for the combustion oxidation treatment of small flow toxic and harmful venting gases to achieve low NOx emissions.

[0178] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0179] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A low-NOx multi-stage surface combustion and catalytic combustion device, characterized in that, include: case; A premixed low-NOx burner, one end of which is inserted into the housing; The incineration structure is located inside the shell and above the premixed low-NOx burner; The heat storage body is located inside the shell and above the incineration structure; A catalytic combustion honeycomb structure is located inside the shell and above the heat storage body; The combustion air inlet is connected to the interior of the housing and is located below the premixed low-NOx burner; The emission device includes an emission pipe, one end of which is connected to the interior of the housing and located above the catalytic combustion honeycomb structure; The low-NOx multi-stage surface combustion and catalytic combustion device is designed to treat waste gas and can achieve the incineration and oxidation of small-flow waste gas without the need for high-calorific-value fuel as an auxiliary combustion gas. The incineration structure includes: A primary honeycomb heating element tray is located inside the housing and above the premixed low-NOx burner; A primary, circuitous resistive heating element is located at least partially within the housing and above the primary honeycomb heating element tray. The primary oxidation chamber is located inside the housing and above the primary circuitous resistive heating element; The secondary honeycomb heating element tray is located inside the housing and above the primary oxidation chamber; The secondary circuitous resistive heating element is at least partially located within the housing and above the secondary honeycomb heating element tray; The secondary oxidation chamber is located inside the housing and above the secondary circuitous resistive heating element; the heat storage element is located above the secondary oxidation chamber.

2. The low-NOx multi-stage surface combustion and catalytic combustion device according to claim 1, characterized in that, The heat storage body includes a foam ceramic heat storage body, and / or the primary meandering resistance heating element and the secondary meandering resistance heating element both include a grate-shaped meandering resistance heating element, and / or the discharge device further includes a rain cap, which is located at the end of the discharge pipe away from the shell.

3. The low-NOx multi-stage surface combustion and catalytic combustion device according to claim 1, characterized in that, Both the primary detour-type resistive heating element and the secondary detour-type resistive heating element include: A mesh-like protective sleeve is located inside the housing and above the primary honeycomb heating element tray or the secondary honeycomb heating element tray; A meandering heating element is located inside the mesh-like protective sleeve and includes a first end and a second end opposite to each other. A refractory fiber structure is located on the outer wall of the shell; The first connecting rod lead-out device extends from the surface of the refractory fiber structure away from the shell into the refractory fiber structure; The second connecting rod lead-out device extends from the surface of the refractory fiber structure away from the shell into the refractory fiber structure; The first connecting rod has one end connected to the first end of the meandering heating element, and the other end led out to the outside of the housing via the first connecting rod lead-out device. The second connecting rod has one end connected to the second end of the meandering heating element, and the other end led out to the outside of the housing via the second connecting rod lead-out device.

4. The low-NOx multi-stage surface combustion and catalytic combustion device according to claim 3, characterized in that, Also includes: The explosion-proof box is located on the side of the fire-resistant fiber structure away from the shell, and is fitted around the first lead-out device and the second lead-out device.

5. The low-NOx multi-stage surface combustion and catalytic combustion device according to any one of claims 1 to 4, characterized in that, The premixed low-NOx burner includes: The distribution chamber is located within the housing; The air intake pipe has one end connected to the distribution chamber and the other end extending to the outside of the housing; Multiple branch jet pipes are located inside the housing and connected to the distribution chamber; each branch jet pipe is provided with multiple nozzles with the same jet direction.

6. A low-NOx internal combustion exhaust gas treatment combustion system, characterized in that, The low-NOx internal combustion exhaust gas treatment system includes: The low-NOx multi-stage surface combustion and catalytic combustion device as described in any one of claims 1 to 5; An exhaust gas piping system includes an exhaust gas piping and a pressure switch; one end of the exhaust gas piping is connected to the premixed low-NOx burner; the pressure switch is located on the exhaust gas piping. A combustion-supporting air system is connected to the combustion-supporting air inlet. A temperature detection device is inserted into the housing and located on the side of the catalytic combustion honeycomb body away from the heat storage body; A power supply system is connected to the incineration structure; The control device is connected to at least the temperature detection device, the power supply system, and the pressure switch.

7. The low-NOx internal combustion exhaust gas treatment and combustion system according to claim 6, characterized in that, The exhaust gas piping system also includes: A manual ball valve is located on the exhaust gas pipeline and on the side of the pressure switch away from the premixed low-NOx burner; A pipeline flame arrester is located on the exhaust gas pipeline and between the manual ball valve and the pressure switch; A manual flow regulating valve is located on the exhaust gas pipeline and between the pressure switch and the premixed low-NOx burner; A dual-cut-off explosion-proof solenoid valve is located on the exhaust gas pipeline and between the manual flow regulating valve and the premixed low-NOx burner.

8. The low-NOx internal combustion exhaust gas treatment and combustion system according to claim 6, characterized in that, The combustion-supporting air system includes: Fan; The combustion air duct is connected at one end to the blower and at the other end to the combustion air inlet; A pipeline switch, including a differential pressure switch or a low-pressure switch, is located on the combustion air pipeline.

9. The low-NOx internal combustion exhaust gas treatment and combustion system according to claim 6, characterized in that, The power supply system includes: DC power supply; The electric heating element power supply is connected to the DC power supply, the control device, and the incineration structure; A current detection and display device is located on the connection line between the power supply of the heating element and the combustion structure; A voltage detection and display device is located on the connection line between the power supply of the heating element and the combustion structure.

10. The low-NOx internal combustion exhaust gas treatment and combustion system according to claim 9, characterized in that, The control device includes: A temperature controller is connected to the temperature detection device; A programmable logic controller is connected to both the temperature controller and the power supply for the heating element; An automatic / pressure control device is connected to both the programmable logic controller and the pressure switch.

11. The low-NOx internal combustion exhaust gas treatment combustion system according to any one of claims 6 to 10, characterized in that, Also includes: The exhaust gas pretreatment system is connected to the end of the exhaust gas pipeline furthest from the premixed low-NOx burner.

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