A high-power surface combustion system suitable for treating high-concentration organic waste gas

Abstract

A high-power surface combustion system suitable for treating high-concentration organic waste gas, comprising a gridded surface burner assembly, an organic waste gas valve group, a combustion-supporting gas valve group, an air distribution system, an igniter module, an exhaust module, and a waste heat recovery module; wherein the gridded surface burner assembly is an integrated burner composed of a segmented metal fiber head and a corresponding segmented premixing chamber; the organic waste gas valve group, the combustion-supporting gas valve group, and the air distribution system are respectively connected to the gas mixing chamber of the surface burner, and the organic waste gas, combustion-supporting gas, and air are mixed and transported to the surface burner for incineration, and the igniter module is arranged in a certain area above the surface burner; the exhaust module is configured on the periphery of the gridded surface burner assembly, and a waste heat recovery module is arranged inside the exhaust module, ultimately achieving standard emission of organic waste gas.

Description

Technical Field

[0001] The present invention relates to the technical field of organic waste gas treatment, in particular to a high-power surface combustion system suitable for treating high-concentration organic waste gas. Background Art

[0002] During the production, storage, transportation, and loading and unloading of organic chemicals, organic components volatilize into the atmosphere and participate in atmospheric chemical reactions. Typical applications include oil loading and unloading at docks, trucks, and trains, and storage of intermediate and finished oil products in tank farms. Typical components include crude oil, gasoline, diesel, jet fuel, triphenyl, and other volatile components.

[0003] The organic waste gas generated in these typical operating environments is characterized by high concentrations and large fluctuations. Previously, the mainstream methods for recovering and treating this highly volatile waste gas were oil and gas recovery processes, such as adsorption (e.g., CN102764562A), condensation (e.g., CN101342427B), and membrane processes (e.g., CN204502711U). Internationally accepted emission standards range from 10g / m³ to 30g / m³, and these oil and gas recovery processes have been very effective in reducing the concentration and emissions of high-concentration waste gas. However, with the introduction of the latest petrochemical standards, such as GB 31570-2015 (Petroleum Refining Industry Pollutant Emission Standard) and GB 31571-2015 (Petrochemical Industry Pollutant Emission Standard), as well as regional and local standards, these previous emission standards are no longer applicable. Current mainstream emission standards are all below 120mg / m³.

[0004] With the introduction of new standards, the existing oil and gas recovery processes (adsorption, condensation, membrane and combined processes) have gradually shown disadvantages in meeting emission standards due to the limitations of the recovery process itself and the characteristics of the adsorbent at the end of the recovery process. In particular, for oil products with a high content of C2 / C3 light components such as crude oil and light naphtha, it is basically impossible for a simple recovery combination process to meet the latest emission requirements.

[0005] Based on the latest emission standards, new technologies for high-concentration oil and gas are gradually being used, such as technologies based on condensation recovery, adsorption absorption, and thermal and catalytic oxidation. However, the above-mentioned technologies all use a combination of conventional oil and gas recovery technologies (adsorption, condensation, membrane, and combined technologies) and existing incineration technologies (thermal storage combustion technology, catalytic combustion technology). The incineration system has strict restrictions on the concentration of the exhaust gas inlet, resulting in many restrictions on the promotion and application of the above-mentioned combustion technology in the field of high-concentration waste gas described in this patent. At the same time, the burners used in existing thermal storage combustion and catalytic combustion are mixed combustion of gas and air after passing through the combustion head into the combustion chamber. The high-temperature residence time in the combustion chamber, the uneven distribution of the flame temperature field, the uneven mixing of the combustion-supporting air, and other problems lead to NO in the flue gas. X , and VOCs emissions exceeding the standard often occur.

[0006] At present, the new metal fiber burner adopts a premixed combustion method, in which the combustion components and air are fully mixed before combustion. Due to the extensive microporous structure characteristics of the fiber layer, it has very good effects in low-nitrogen combustion control and ultra-low emission control; at the same time, the flexible structure of the metal fiber enables the burner head to be made into any shape, such as flat, cylindrical, conical, concave, corrugated, etc.

[0007] However, due to issues with the metal fiber manufacturing process, when the unit combustion calorific value exceeds 4MWH, the burner is generally made into a cylindrical shape. The length of the cylinder increases the heat load of the burner. This design can achieve stable combustion in stable, low-unit-load areas. However, for the high-concentration organic waste gas field described in this patent, the waste gas calorific value changes frequently and the waste gas air volume operating range is large. A similar design will cause the burner to be extremely prone to backfire or significantly reduce the burner life. Therefore, this patent develops a new type of high-power surface combustion system suitable for the treatment of high-concentration organic waste gas to achieve standard emission of organic waste gas in the above-mentioned field. Summary of the Invention

[0008] The present invention provides a high-power surface combustion system suitable for treating high-concentration organic waste gas, which has the characteristics of flexible treatment capacity, flexible waste gas calorific value flux and small footprint.

[0009] The technical solution of the present invention to solve the above-mentioned technical problems is as follows: a high-power surface combustion system suitable for the treatment of high-concentration organic waste gas, characterized in that it includes a gridded surface burner combination, an organic waste gas valve group, a combustion-supporting gas valve group, an air distribution system, an igniter module, an exhaust module, and a waste heat recovery module, wherein the gridded surface burner combination is an integrated burner spliced ​​by a segmented metal fiber head and a corresponding segmented premixing chamber.

[0010] The gridded surface burner combination is a burner group formed based on independent surface burners, and each surface burner can operate independently.

[0011] The number of the independent surface burners is two or more groups.

[0012] The independent surface burner is composed of a metal fiber head and a gas mixing chamber. The metal fiber head is fixed to the end of the gas mixing chamber through a metal frame. Organic waste gas, combustion-supporting gas and air gas inlets are arranged on the other side of the gas mixing chamber. The three sources of gas are fully mixed in the gas mixing chamber and fully burned through the metal fiber head at the end of the mixing chamber.

[0013] The organic waste gas is a mixture of alkane compounds, nitrogen, air, and other inert gases, wherein the concentration of the alkane compounds ranges from 0% to saturation concentration.

[0014] The combustion-supporting gas is a combustible organic gas such as natural gas, propane gas, gas, fuel gas, etc.

[0015] When the system operating load is below the design load, one or more independent burners can be activated to achieve flexible operation of high-power burners. When only some independent burners are activated, the valves for the organic waste gas and combustion-supporting gas pipelines of the inactive burners are closed, the air inlet valves are partially opened, and the minimum air velocity is maintained to prevent burner flashback. The minimum operating load of the fan is required to maintain a unit air velocity greater than a certain value, generally greater than the maximum flashback velocity of all combustion components.

[0016] The metal fiber heads of the independent surface burners are of uniform shape and can be spliced ​​together to form a plane with no internal gaps, such as a square, rectangle, fan, or circle. A square or fan-shaped structure is preferred. The plane after splicing is a square, rectangle, or circle.

[0017] The high-power surface combustion system described in this patent has a design operating load greater than 4MWH, preferably greater than 8MWH. When the operating load is less than 4MWH, a single surface burner can achieve stable operation of the system.

[0018] The high-power surface combustion system described in this patent has a design operating load of no more than 100 MWH, and preferably a design operating load of no more than 80 MWH.

[0019] Specifically, for the high-power surface combustion system described in this patent, when the plane formed by the splicing of the metal fiber heads is circular, the design operating load is no more than 60MWH. When the plane formed by the splicing of the metal fiber heads is square, the design operating load is no more than 80MWH. When the plane formed by the splicing of the metal fiber heads is rectangular, the design operating load is no more than 100MWH.

[0020] When the design operating load is greater than 100MWH, multiple sets of high-power surface combustion systems are used to achieve stable operation of the system.

[0021] The independent surface burners are respectively provided with independent gas mixing chambers to achieve mixing of waste gas, combustion-supporting gas and air; the organic waste gas valve group, combustion-supporting gas valve group and air distribution system are respectively connected to the gas mixing chambers.

[0022] The gas mixing chamber is composed of a single-stage or multi-stage mixer, which effectively mixes the organic waste gas, combustion-supporting gas, and air. The mixer adopts one or a combination of straight tube structure, Venturi structure, and diffuser structure, and optionally adds a turbulent structure in the mixing section to achieve more uniform gas mixing.

[0023] Generally, the three gases described in the present invention have the following relationship: the air volume is greater than the organic waste gas volume, which is much greater than the combustion-supporting gas volume. Correspondingly, the air pipe diameter is greater than the organic waste gas pipe diameter, which is greater than the combustion-supporting gas pipe diameter.

[0024] Therefore, optionally, in the gas mixing chamber, the three gases are mixed in a stepwise manner according to the above-mentioned proportions. That is, the organic waste gas and the combustion-supporting gas are first premixed in the primary mixing section; and the premixed gas is further mixed with air in the secondary mixing section.

[0025] Generally, the length-to-diameter ratio of the mixing chamber is greater than 2:1.

[0026] Since the organic waste gas described in this patent has a high calorific value, the combustion-supporting gas is not required during operation. The combustion-supporting gas supplements the combustion calorific value according to the operation of the combustion chamber.

[0027] The organic waste gas valve group and the combustion-supporting gas valve group are respectively arranged at the front end of the gas mixing chamber of each independent surface burner, and realize the flow control and parameter (including temperature, pressure, concentration, etc.) monitoring of each gas path.

[0028] The organic waste gas is flow-controlled and parameter-monitored through the organic waste gas valve group; the combustion-supporting gas is flow-controlled and parameter-monitored through the combustion-supporting gas valve group.

[0029] The organic waste gas valve group is equipped with an automatic control valve, a flow monitoring instrument, and optionally a pressure monitoring instrument, a concentration monitoring instrument, a temperature monitoring instrument, a flame arrester, etc. The organic waste gas valve group is directly connected to the gas mixing chamber through a pipeline.

[0030] The combustion-supporting valve group is equipped with an automatic control valve, and can be optionally equipped with pressure monitoring instruments, flow monitoring instruments, temperature monitoring instruments, flame arresters, etc. The combustion-supporting valve group is directly connected to the gas mixing chamber through a pipeline.

[0031] The air is distributed through an air distribution system to achieve flow control and parameter monitoring (temperature, flow, pressure, etc.). It is delivered to each independent gas mixing chamber through an independent fan system or a unified fan system, and the air volume in each independent gas mixing chamber is controlled by an independent air valve.

[0032] Preferably, the air distribution system operates prior to other modules and is the last to shut down when the system shuts down. That is, before the combustion system is ignited, the air distribution system operates for a certain period of time, and after the combustion system is shut down, the air distribution system continues to operate for a certain period of time to ensure safe operation of the system.

[0033] The high-power burner system automatically adjusts the switch and operating load of the independent burner based on the total calorific value HT of the organic waste gas.

[0034] The opening of the individual burners and the automatic regulation of the system are achieved in two optional ways:

[0035] The design load of the independent burner is not greater than HD, and the number of independent burners is N, where N>1. (HD: MWH)

[0036] Design load of high power burner: HT=NX HD (HT:MWH).

[0037] (1) Estimation of the total calorific value HTa (HTa: MWH) of organic waste gas

[0038] Estimate the unit calorific value Ha of oil and gas during the design phase (Ha: MW / m3 organic waste gas):

[0039] ,

[0040] Among them, there are n organic components in oil and gas, k is the kth component in oil and gas, Hak is the maximum possible calorific value of the kth component in 1m3 of oil and gas, and C0 is the maximum possible concentration in 1m3 of oil and gas;

[0041] Monitor parameters such as flow rate F (F: m3 / h), concentration C (C: g / m3) of organic waste gas;

[0042] Calculate the total calorific value of oil and gas: HTa=Ha XFX (C / C0);

[0043] During operation, the number of independent burners turned on is: n = round(HTa / HD) + 1. n shall not be greater than N;

[0044] During operation, automatically adjust the number of independent burners turned on according to the flow rate F of the organic waste gas;

[0045] During operation, fluctuations in the oil and gas components cause the actual combustion heat value HTa to deviate from the design value HT, which is manifested as the combustion temperature in the combustion chamber not being able to be maintained. To ensure the stable operation of the system, appropriately supplement the combustion-supporting gas to the combustion system to maintain the stability of the combustion heat value and ensure that the operating load of the system is within the design range.

[0046] (2) Combustion chamber temperature T

[0047] Estimate the combustion temperature TD under the design load conditions based on the organic waste gas components under the design conditions;

[0048] Estimate the combustion temperature TDMin when a single independent burner is operating and other burners are on standby;

[0049] Set the upper limit of the combustion chamber temperature: Ta1, where Ta1 = TD + T01; T01 is a fixed value between 0°C and 200°C;

[0050] Set the lower limit of the combustion chamber temperature: Ta2, where Ta2 = TDmin - T02; T02 is a fixed value between 0°C and 200°C;

[0051] Automatically adjust the operation of the system by monitoring the temperature T of the combustion chamber; To achieve precise monitoring of the combustion chamber temperature, preferably set up temperature monitors T1, T2, T3... respectively close to each independent burner side; [[ID=

[0052] When Max{T1, T2, T3…}>Ta1 and the system is not operating at full load, turn on a new independent burner to increase the operating load of the system;

[0053] When Min{T1, T2, T3…}>Ta1 or the system is operating at full load, adjust or even close the waste gas inlet valve of the last group of independent burners to reduce the operating load of the system;

[0054] When Max{T1, T2, T3…}<Ta1, adjust the inlet valve of the last group of independent burners to reduce the operating load of the system;

[0055] When Min{ T1, T2, T3…} < Ta2, gradually close the intake valves of the independent burners to reduce the system operating load until the system temperature can be maintained above the lower limit of the temperature setting; and start the combustion-supporting gas system of the operating independent burners to maintain the temperature of the corresponding combustion chamber at the design temperature TD.

[0056] When Max{ T1, T2, T3…} < Ta2, close the intake valves of all independent burners, start the combustion-supporting gas system until the system temperature can be maintained above the lower limit of the temperature setting; or shut down the system.

[0057] The ignition module is a low-power burner, configured in a certain area above the metal fiber combustion surface of the surface burner near the inner surface of the combustion chamber, and the safe and stable start of the high-power surface combustion system is realized by the ignition module.

[0058] The ignition module is one of an ejector gas burner, a gas distribution type gas burner or other small low-power burners. The ignition mode is a high-energy igniter, an internal flame transfer type igniter or other ignition forms.

[0059] The ignition module operates in a pilot light mode or an intermittent operation mode.

[0060] The number of the ignition modules is 1 or N. N is the number of independent burners. When the number of igniters is 1, the igniter is arranged in the first ignition independent burner area. When the number of igniters is N, the ignition modules are arranged in each independent burner area.

[0061] The ignition module starts before the high-power surface combustion system is started. After the ignition monitor is normal, the surface burner sequentially starts the air distribution system, the combustion-supporting gas valve group, and the organic waste gas valve group. After the surface burner system operates normally, the ignition module is turned off or always on.

[0062] The exhaust module consists of a high exhaust chimney, and the high exhaust chimney is a one-section or multi-section structure. The chimney height is restricted by local regulations. Generally, the chimney height is not less than 15 meters.

[0063] The exhaust module is installed on the top of the grid-type surface burner and completely wraps the surface burner to form a combustion chamber, and the inside of the combustion chamber is high-temperature burned-out gas.

[0064] The outside of the exhaust module is made of a metal material or a non-metal material structural material, and the inner lining is a high-temperature resistant heat insulation material to prevent the high-temperature burned-out gas from contacting the structural material and causing damage to the structural material or personal injury.

[0065] The waste heat recovery module is located within the exhaust module. A selection of coil, jacket, or tube-in-tube heat exchangers is available to recover heat from the flue gas. The recovered heat is supplied to other units in the form of hot water, steam, or hot oil.

[0066] A high-power surface combustion system suitable for treating high-concentration organic waste gas is characterized in that the high-power surface combustion system suitable for treating high-concentration organic waste gas according to the present invention operates in the following manner:

[0067] (1) The air distribution system is started and the air is purged for a certain period of time. After the purge is completed, the valve opening is adjusted to the system operating state and maintained;

[0068] (2) The waste heat recovery module is started;

[0069] (3) The igniter module starts and maintains operation;

[0070] (4) The combustion-supporting gas valve group corresponding to the first group of independent burners is opened, the combustion-supporting gas enters, and the surface burner is ignited;

[0071] (5) The organic waste gas valve group corresponding to the first group of independent burners is gradually opened, the organic waste gas enters, and the surface burner operates;

[0072] (6) The organic waste gas valve group corresponding to the first group of independent burners is fully opened, and the flow rate F of the organic waste gas or the temperature T of the combustion chamber is monitored. When the design load of the first independent burner is exceeded, the second independent burner is opened;

[0073] (7) The combustion-supporting gas valve group corresponding to the second group of independent burners is opened, the combustion-supporting gas enters, and the surface burner is ignited;

[0074] (8) The organic waste gas valve group corresponding to the second group of independent burners is gradually opened, the organic waste gas enters, and the surface burner is running;

[0075] (9) The organic waste gas valve group corresponding to the second group of independent burners is fully opened, and the flow rate F of the organic waste gas or the combustion chamber temperature T is monitored. When the design load of the second independent burner is exceeded, the third independent burner is opened;

[0076] (10) The flow rate F of the organic waste gas or the temperature T of the combustion chamber does not exceed the design load after the nth group of independent burners is turned on, where n is not greater than N (N: the number of independent burners); the system maintains operation within the design load range;

[0077] (11) The combustion-supporting valve group adjusts and replenishes the combustion calorific value in time according to the temperature T of the combustion chamber to maintain the normal operation of the system;

[0078] (12) The amount of organic waste gas to be treated is reduced or shut down, and the independent burners are gradually shut down according to the configured flow rate F, concentration C or temperature T monitoring until all independent burners are completely shut down;

[0079] (13) All exhaust valve groups are closed, and all combustion-supporting gas valve groups are closed;

[0080] (14) The waste heat recovery module is closed;

[0081] (15) The air distribution system is shut down. The system is shut down.

[0082] The present invention has the following advantages: large operating load, flexible system operation, and the ability to directly treat high-concentration organic waste gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0083] Figures 1 to 6 Schematic diagram of a typical high-power surface combustion system.

[0084] Figure 1 It is a high-power surface combustion system suitable for treating high-concentration organic waste gas, wherein the number of independent burners is two groups.

[0085] Figure 2 This is a schematic diagram of the structure of a two-chamber high-power surface combustion system, in which the independent burners are square.

[0086] Figure 3 This is a schematic diagram of the structure of a two-chamber high-power surface combustion system, in which the independent burner is semicircular.

[0087] Figure 4 It is a high-power surface combustion system suitable for treating high-concentration organic waste gas, in which the number of independent burners is four groups.

[0088] Figure 5 This is a schematic diagram of the structure of a four-chamber high-power surface combustion system, in which the independent burners are square.

[0089] Figure 6 This is a schematic diagram of the structure of a four-chamber high-power surface combustion system, in which the independent burners are fan-shaped.

[0090] Figure 7 、 Figure 8 This is a schematic diagram of a non-grid surface burner, wherein the surface burner is disc-shaped.

[0091] Attachment Figure 1 To the attached Figure 8 The numbers in the table represent:

[0092] 111 / 211 / 311 / 411 are the fuel gas inlet ports, 112 / 212 / 312 / 412 are the fuel gas pressure regulating valves, and 113 / 213 / 313 / 413 are the fuel gas control valves;

[0093] 121 / 221 / 321 / 421 are the organic waste gas inlets, and 122 / 222 / 322 / 422 are the organic waste gas regulating valves;

[0094] 131 is the air inlet, 132 is the air filter, 133 is the air blower, 134 / 234 / 334 / 434 are the air regulating valves;

[0095] 141 / 241 is the ignition gas inlet, 142 / 242 is the ignition gas pressure regulating valve, 143 / 243 is the ignition gas regulating valve, and 144 / 244 is the igniter;

[0096] 151 / 251 / 351 / 451 is the gas mixing chamber, 152 / 252 / 352 / 452 is the internal turbulence structure of the gas mixing chamber; 153 / 253 / 353 / 453 is the connecting pipe between the gas mixing chamber and the burner;

[0097] 161 / 261 / 361 / 461 are gridded independent burners, 162 / 262 / 362 / 462 are metal fiber heads of independent burners, 163 / 263 / 363 / 463 are insulation materials of independent burners, and 164 is the burner base;

[0098] 171 is a high exhaust chimney, 172 is lined with refractory materials;

[0099] 181 is the waste heat recovery medium inlet, and 182 is the waste heat recovery medium outlet;

[0100] 191 is an automatic control system.

[0101] In the aforementioned instrument, P stands for pressure monitoring, T stands for temperature monitoring, F stands for flow monitoring, C stands for concentration monitoring, and O2 stands for oxygen content monitoring.

[0102] The present invention will be further described below with reference to the accompanying drawings, which are not intended to limit the scope of the present invention. Specific implementation method 1

[0104] like Figure 1 The schematic diagram of a high-power surface combustion system suitable for treating high-concentration organic waste gas is shown in FIG. , wherein the number of independent burners is two. The gridded independent burner structure is as follows: Figure 2 shown.

[0105] The organic waste gas 121 and 221 are high-concentration organic waste gases volatilized from large and small breaths in the oil tank area. The flow of the organic waste gas is controlled by the waste gas control valves 122 and 222, and the real-time monitoring of the various states of the waste gas is achieved through temperature monitoring T, pressure monitoring P, and flow monitoring F.

[0106] The supporting combustion gas 111 and 211 are natural gas. The gas pressure is controlled by the pressure reducing valves 112 and 212, the natural gas flow is regulated by the supporting combustion gas control valves 113 and 213, and the various states of the natural gas are monitored in real time by the pressure monitoring P and the flow monitoring F.

[0107] Air 131 is delivered to the combustion system through the air blower 133, and particulate matter in the air is intercepted by the air filter 132. The air supply is controlled by the air control valves 134 and 234 to ensure stable operation of the combustion system. Real-time monitoring of the air is achieved through temperature monitoring T.

[0108] Organic waste gas, combustion-supporting gas and air are fully mixed in the gas mixing chamber 151, 251, wherein the gas mixing chamber is a straight pipe with fixed spiral blades 152, 252 arranged inside to enhance airflow mixing. The mixed gas is transported to the surface burner through the connecting pipes 153, 253 to destroy the organic components of the exhaust gas.

[0109] In this embodiment, the ignition system is only installed in the upper region of the first independent burner. The ignition system is located above the metal fiber section of the first independent burner. Ignition gas 141 is natural gas. Ignition gas pressure is controlled by a pressure reducing valve 142, and ignition gas on / off is controlled by an ignition gas control valve 143. Ignition gas ignition and monitoring are achieved through a high-energy ignition device 144. Real-time monitoring of the ignition gas status is achieved through a pressure monitoring device P.

[0110] The mixed gas enters the gridded, independent surface burners 161 and 261 for final exhaust destruction. The integrated burner base 164 is connected to the premixing chamber pipelines 153 and 253, respectively. The burner bases are topped with independent burner metal fiber heads 162 and 262, respectively. Insulation material 163 and 263 is placed outside the burner head area to prevent the heat from the burners from adversely affecting the environment.

[0111] After the combustion is completed, the exhaust gas is discharged in compliance with the emission standards through an integrated high-discharge chimney 171 fixed on the upper part of the gridded independent burner, wherein the chimney is lined with heat-insulating material 172.

[0112] A coil-type waste heat recovery system is installed inside the high exhaust chimney, and the heating medium is hot medium oil. The cold medium oil 181 is controlled by a control valve group to realize heat recovery control, and the hot medium oil 182 is delivered to the heat user unit.

[0113] The gridded surface burner assembly, organic waste gas valve group, combustion-supporting gas valve group, air distribution system, igniter module, exhaust module, and waste heat recovery module are automatically controlled by the editable logic control system 191, and the entire operating system is unmanned.

[0114] in, Figure 2 The combustion surface of the independent combustion chamber shown is square, and the design load of the independent burner is 5MWh; the high-power burner combined into an integrated structure is a rectangular structure, and the maximum design load of the integrated high-power surface combustion system is 10MWh.

[0115] like Figure 2 As described above, 161 and 261 are independent surface burners, which use a square metal structure frame covered with a metal fiber layer 162 / 262. The metal structure frame is installed on the high-power surface combustion system combustion head base 164 through a certain connection form.

[0116] The high-power surface combustion system suitable for treating high-concentration organic waste gas described in Example 1 operates as follows:

[0117] 1) Air distribution system starts: fan 133 starts and the system purges for a certain period of time;

[0118] 2) Waste heat recovery module starts: cold medium oil 181 is transported into the burner system;

[0119] 3) Ignition module starts: Ignition gas 141 enters, ignites through igniter 144, and is transported into the combustion chamber;

[0120] 4) The combustion-supporting gas valve group 113 corresponding to the first group of independent burners 161 is opened, the combustion-supporting gas enters, and the surface burners are started;

[0121] 5) The organic waste gas valve group 122 corresponding to the first group of independent burners 161 is gradually opened, the organic waste gas 121 enters, and the surface burner operates;

[0122] 6) The organic waste gas valve group 122 corresponding to the first group of independent burners 161 is fully opened to monitor the flow rate F or temperature T of the organic waste gas. When the flow rate F or temperature T exceeds the design load of the first independent burner 161, the second independent burner 261 is opened;

[0123] 7) The combustion-supporting gas valves 213 corresponding to the second group of independent burners 261 are opened, the combustion-supporting gas 211 enters, and the surface burners 261 are ignited;

[0124] 8) The organic waste gas valve group 222 corresponding to the second group of independent burners 261 is gradually opened, the organic waste gas 221 enters, and the surface burner 261 operates;

[0125] 9) The organic waste gas valve group 222 corresponding to the second group of independent burners 261 is fully opened to monitor the flow rate F of the organic waste gas or the combustion chamber temperature T;

[0126] 10) The flow rate F of the organic waste gas or the temperature T of the combustion chamber shall not exceed the design load of 10MWH after the two sets of independent burners are turned on; within the design load range, the system maintains operation;

[0127] 11) The combustion-supporting valve groups 113 and 213 adjust and replenish the combustion calorific value in time according to the temperature T of the combustion chamber to maintain the normal operation of the system;

[0128] 12) The amount of organic waste gas to be treated is reduced or shut down, and the flow rate F, concentration C or temperature T configured in 1 is monitored, and the second independent burner 261 is gradually closed, the exhaust valve group 222 is closed, and the combustion-supporting gas valve group 213 is closed; when the organic waste gas flow rate is reduced to zero, the independent burner 161 is closed, the exhaust valve group 122 is closed, and the combustion-supporting gas valve group 113 is closed;

[0129] 13) The waste heat recovery cold medium input 183 is closed;

[0130] 14) The air distribution fan 133 is turned off, and the air distribution valves 134 and 234 are closed;

[0131] 15) System downtime;

[0132] 16) In this embodiment, processes a to o are all controlled by the programmable logic control system 191.

[0133] The organic waste gas treatment system described in Example 1 has tail gas emissions that meet the latest national emission standards and has a high heat recovery effect. Specific embodiment 2

[0135] like Figure 1 The schematic diagram of a high-power surface combustion system suitable for exhaust gas treatment is shown in FIG. 1 , wherein the number of independent burners is two. The system configuration and operation process of Example 2 are the same as those of Example 1, except that the structure of the independent burners is different. The gridded independent burner structure in Example 2 is as shown in FIG. Figure 3 shown.

[0136] in, Figure 3 The independent combustion chamber shown is composed of an integrated burner base 164 and gridded semicircular independent burners 161, 261, and the combustion surfaces 162, 262 are semi-disc-shaped. The combined integrated high-power burner is disc-shaped.

[0137] The design load of the independent burner is 7.5MWh, and the maximum design load of the integrated high-power surface combustion system is 15MWh.

[0138] The organic waste gas treatment system described in Example 2 has tail gas emissions that meet the latest national emission standards and a high heat recovery load. Specific embodiment 3

[0140] like Figure 4 The schematic diagram of a high-power surface combustion system suitable for treating high-concentration organic waste gas is shown in FIG. 4 , wherein the number of independent burners is four. The gridded independent burner structure is as follows: Figure 5 shown.

[0141] Organic waste gases 121, 221, 321, and 421 are high-concentration organic waste gases generated during loading at the oil terminal. The flow of organic waste gases is controlled by waste gas control valves 122, 222, 322, and 422, and real-time monitoring of various waste gas states is achieved through temperature monitoring T, pressure monitoring P, flow monitoring F, concentration monitoring C, and oxygen content monitoring O2.

[0142] The supporting fuel gas 111, 211, 311, and 411 are liquefied petroleum gas. The gas pressure is controlled by the pressure reducing valves 112 and 212, and the natural gas flow is regulated by the supporting fuel gas control valves 113, 213, 313, and 413. The pressure monitoring P and flow monitoring F are used to monitor the various states of the natural gas in real time.

[0143] Air 131 is delivered to the combustion system through the air blower 133, and particulate matter in the air is intercepted by the air filter 132. The air distribution is controlled by the air control valves 134, 234, 334, and 434 to ensure stable operation of the combustion system. Real-time monitoring of the air is achieved through the temperature monitoring T.

[0144] Organic waste gas, combustion-supporting gas and air are fully mixed in the gas mixing chambers 151, 251, 351 and 451, wherein the gas mixing chambers are of a Venturi tube structure, and 152, 252, 352 and 452 are Venturi structures to enhance airflow mixing. The mixed gas is transported to the surface burner through connecting pipes 153, 253, 353 and 453 to destroy the organic components of the exhaust gas.

[0145] In this embodiment, ignition systems are installed above the first and third independent burners 161 and 361, respectively. These systems are located above the metal fibers of the first and third independent burners. Ignition gas 141 and 341 is natural gas. Ignition gas pressure is controlled by pressure reducing valves 142 and 342, while ignition gas control valves 143 and 343 enable on / off control of the ignition gas. High-energy ignition devices 144 and 344 ignite and monitor the ignition gas. Pressure monitoring devices (P) provide real-time monitoring of the ignition gas status.

[0146] The mixed gas enters the gridded, independent surface burners 161, 261, 361, and 461 for final exhaust destruction. The integrated burner base 164 is connected to the premixing chamber pipelines 153, 253, 353, and 453, respectively. Independent burner metal fiber heads 162, 262, 362, and 462 are mounted on the burner base, respectively. Insulation material 163, 263, 363, and 463 is installed outside the burner head area to prevent the heat from the burners from adversely affecting the environment.

[0147] After the combustion is completed, the exhaust gas is discharged in compliance with the emission standards through an integrated high-discharge chimney 171 fixed on the upper part of the gridded independent burner, wherein the chimney is lined with heat-insulating material 172.

[0148] The gridded surface burner assembly, organic waste gas valve group, combustion-supporting gas valve group, air distribution system, igniter module, exhaust module, and waste heat recovery module are automatically controlled by the editable logic control system 191, and the entire system is unmanned.

[0149] in, Figure 5 The combustion surface of the independent combustion chamber shown is square, and the design load of the independent burner is 10MWh; the high-power burner combined into an integrated structure is a square structure, and the maximum design load of the integrated high-power surface combustion system is 40MWh.

[0150] like Figure 5 As described above, 161, 261, 361, and 461 are independent surface burners, which use a square metal structure frame with a metal fiber layer 162 / 262 covered on the surface. The metal structure frame is installed on the high-power burner base 164 through a certain connection form.

[0151] The high-power surface combustion system suitable for treating high-concentration organic waste gas described in Example 3 operates as follows:

[0152] 1) Air distribution system starts: fan 133 starts, control valves 134, 234, 334, and 434 open, and the system is purged;

[0153] 2) Ignition module start-up: Ignition gas 141, 341 enters, ignites through igniters 144, 344, and is transported into the first combustion chamber and the third combustion chamber respectively;

[0154] 3) The combustion-supporting gas valve group 113 corresponding to the first group of independent burners 161 is opened, the combustion-supporting gas enters, and the surface burners are started;

[0155] 4) The organic waste gas valve group 122 corresponding to the first group of independent burners 161 is gradually opened, the organic waste gas 121 enters, and the surface burner operates;

[0156] 5) The organic waste gas valve group 122 corresponding to the first group of independent burners 161 is fully opened to monitor the flow rate F, temperature T, concentration C, or oxygen content O2 of the organic waste gas. When the load exceeds the design load of the first independent burner 161, the second independent burner 261 is opened;

[0157] 6) The combustion-supporting gas valves 213 corresponding to the second group of independent burners 261 are opened, the combustion-supporting gas 211 enters, and the surface burners 261 are ignited;

[0158] 7) The organic waste gas valve group 222 corresponding to the second group of independent burners 261 is gradually opened, the organic waste gas 221 enters, and the surface burner 261 operates;

[0159] 8) The organic waste gas valve group 222 corresponding to the second group of independent burners 261 is fully opened to monitor the flow rate F, temperature T, concentration C, or oxygen content O2 of the organic waste gas;

[0160] 9) Start the third group of independent burners 361 and the fourth group of independent burners 461 in sequence;

[0161] 10) The flow rate F or concentration C of organic waste gas does not exceed the design load of 32MWH after the four independent burners are turned on; within the design load range, the system maintains operation;

[0162] 11) The amount of organic waste gas to be treated is reduced or shut down, the flow rate F, concentration C or temperature T configured in 1 is monitored, and the organic waste gas valve group and the combustion-supporting gas valve group of the fourth independent burner, the third independent burner, the second independent burner, and the first independent burner are gradually shut down;

[0163] 12) Ignition is turned off;

[0164] 13) The air distribution fan 133 is turned off, and the air distribution valves 134 and 234 are closed;

[0165] 14) System downtime;

[0166] 15) In this embodiment, processes a to n are all controlled by the programmable logic control system 191.

[0167] The organic waste gas treatment system described in Example 3 has high treatment capacity, flexible operation of treatment load, and tail gas emissions that meet the latest national emission standards. Specific implementation method 4

[0169] like Figure 4 The schematic diagram of a high-power surface combustion system suitable for exhaust gas treatment is shown in FIG. 4 , wherein the number of independent burners is four. The system configuration and operation process of Example 4 are the same as those of Example 3, except that the structure of the independent burners is different. The gridded independent burner structure in Example 4 is as shown in FIG. Figure 6 shown.

[0170] in, Figure 6 The independent combustion chamber shown is composed of an integrated burner base 164 and gridded sector-shaped independent burners 161, 261, 361, 461. The combustion surface is a sector-shaped plane. The integrated high-power burner after assembly is disc-shaped.

[0171] The independent burner adopts a fan-shaped metal structure frame with a metal fiber layer 162 / 262 covered on the surface. The metal structure frame is installed on the high-power burner base 164 through a certain connection form.

[0172] The design load of the independent burner is 7MWh, and the maximum design load of the integrated high-power surface combustion system is 28MWh.

[0173] The organic waste gas treatment system described in Example 4 has high treatment capacity, flexible operation of treatment load, and tail gas emissions that meet the latest national emission standards.

[0174] Comparative Example 1

[0175] like Figure 7 A schematic diagram of a high-power surface combustion system for treating organic waste gas is shown in FIG. , wherein the burner head structure is as follows Figure 8 shown.

[0176] The organic waste gas 121 is a high-concentration organic waste gas. The flow rate of the organic waste gas is controlled by the waste gas control valve 122, and the real-time monitoring of various states of the waste gas is achieved through temperature monitoring T, pressure monitoring P, and flow monitoring F.

[0177] The supporting fuel gas 111 is natural gas. The gas pressure is controlled by the pressure reducing valve 112, the natural gas flow is regulated by the supporting fuel gas control valve 113, and the various states of the natural gas are monitored in real time by the pressure monitoring P and the flow monitoring F.

[0178] Air 131 is delivered to the combustion system through the air blower 133, and particulate matter in the air is intercepted by the air filter 132. The air supply is controlled by the air control valve 134 to ensure stable operation of the combustion system. Real-time monitoring of the air is achieved through temperature monitoring T.

[0179] The organic waste gas, combustion-supporting gas and air are fully mixed in the gas mixing chamber 151, wherein the gas mixing chamber is a straight pipe mixing chamber, and the mixed gas is transported to the surface burner through the connecting pipe 153 to destroy the organic components of the tail gas.

[0180] The ignition system is located above the burner's metal fiber. Ignition gas 141 is natural gas. Ignition gas pressure is controlled by a pressure reducing valve 142, and ignition gas on / off is controlled by an ignition gas control valve 143. Ignition gas ignition and monitoring are achieved through a high-energy ignition device 144. Real-time monitoring of the ignition gas status is achieved through a pressure monitoring device P.

[0181] The mixed gas enters a gridded, independent surface burner 161 for final exhaust destruction. A burner base 164 is connected to the premixing chamber pipeline 153. An independent burner metal fiber head 162 is mounted on top of the burner base, and insulation material 163 is placed outside the burner head area to prevent the burner heat from adversely affecting the environment.

[0182] The gridded surface burner assembly, organic waste gas valve group, combustion-supporting gas valve group, air distribution system, igniter module, and exhaust module are automatically controlled by the editable logic control system 191, and the entire operating system is unmanned.

[0183] in, Figure 2 The combustion surface of the independent combustion chamber shown is disc-shaped, and the design load of the burner is 5MWh.

[0184] like Figure 8 As described above, the burner 161 adopts a cylindrical metal structure frame with a metal fiber layer 162 covered on the surface. The metal structure frame is installed on the surface burner combustion head base 164 through a certain connection form.

[0185] The exhaust gas combustion system described in Comparative Example 1 was operated as follows:

[0186] 1) Air distribution system starts: fan 133 starts and the system is purged;

[0187] 2) Ignition module starts: Ignition gas 141 enters, ignites through igniter 144, and is transported into the combustion chamber;

[0188] 3) The combustion-supporting gas valve group 113 corresponding to the burner 161 is opened, the combustion-supporting gas enters, and the surface burner is started;

[0189] 4) The organic waste gas valve group 122 corresponding to the burner 161 is gradually opened, the organic waste gas 121 enters, and the surface burner is running;

[0190] 5) The organic waste gas valve group 122 corresponding to the burner 161 is fully opened to monitor the flow rate F or temperature T of the organic waste gas;

[0191] 6) The flow rate F of organic waste gas does not exceed the design load of 5MWH after the burner is turned on; within the design load range, the system maintains operation;

[0192] 7) The amount of organic waste gas to be treated is reduced or closed, and the waste gas valve group 122 and the combustion-supporting gas valve group 113 are gradually closed; when the flow rate of organic waste gas is reduced to zero, the burner 161 is turned off;

[0193] 8) The air distribution fan 133 is turned off, and the air distribution valve 134 is closed;

[0194] 9) System downtime;

[0195] 10) In this embodiment, processes a to i are all controlled by the programmable logic control system 191.

[0196] Compared with the organic waste gas treatment system described in Example 1, the treatment capacity is relatively low.

[0197] The parts not involved in the present invention are the same as the existing technology or can be implemented by using the existing technology.

Claims

1. A high-power surface combustion system suitable for treating high-concentration organic waste gas, characterized in that: It includes a gridded surface burner assembly, an organic waste gas valve group, a combustion-supporting gas valve group, an air distribution system, an igniter module, an exhaust module, and a waste heat recovery module. Automatic control is achieved through an editable logic control system. The gridded surface burner assembly is composed of a segmented metal fiber head and a corresponding segmented premixing chamber spliced ​​together. The gridded surface burner combination is a burner group formed based on independent surface burners, each surface burner can operate independently, the number of independent surface burners is two or more, the metal fiber heads of the independent surface burners have the same shape and can be spliced ​​into a plane with no gaps inside, and the plane is square, rectangular, fan-shaped or circular; The independent surface burner is composed of a metal fiber head and a gas mixing chamber. The metal fiber head is fixed to the end of the gas mixing chamber by a metal frame. The other side of the gas mixing chamber is provided with an inlet for organic waste gas, combustion-supporting gas, and air. The three gases are fully mixed in the gas mixing chamber and fully burned by the metal fiber head at the end of the mixing chamber. The gas mixing chamber is composed of a one-stage mixer or a multi-stage mixer, which realizes effective mixing of organic waste gas, combustion-supporting gas and air in the gas mixing chamber; the mixer adopts one or more combinations of straight pipe structure, Venturi structure and diffuser structure, and adds a turbulent flow structure in the mixing section to achieve more uniform gas mixing; The organic waste gas valve group and the combustion-supporting gas valve group are respectively arranged at the front end of the gas mixing chamber of each independent surface burner, and realize the flow control and parameter monitoring of each gas path; The air is distributed through the air distribution system to achieve flow control and parameter monitoring, and is delivered to each independent gas mixing chamber through an independent fan system or a unified fan system. The air volume of each independent gas mixing chamber is controlled by an independent air valve. The parameters include temperature, pressure, flow rate and concentration.

2. The high-power surface combustion system suitable for treating high-concentration organic waste gas as described in claim 1, wherein the design operating load of the high-power surface combustion system is greater than 4MWH and not greater than 100MWH; when the design operating load is greater than 100MWH, multiple groups of high-power surface combustion systems are used to achieve stable operation of the system.

3. The high-power surface combustion system suitable for treating high-concentration organic waste gas as described in claim 1, wherein the system automatically adjusts the switch and operating load of the independent burner based on the total calorific value HT of the organic waste gas; the opening of the independent burner and the automatic adjustment of the system are achieved based on the following two optional methods: (1) estimation of the total calorific value HTa of the organic waste gas, the unit of the total calorific value HTa is MWH; (2) the temperature T of the combustion chamber.

4. The high-power surface combustion system suitable for the treatment of high-concentration organic waste gas as described in claim 1, wherein the igniter module is a kind of induced-type gas burner, gas-matched gas burner or other small low-power burner; the ignition mode is a high-energy igniter or an internal flame igniter; the igniter module is a long-burning lamp operation mode or an intermittent operation mode; the number of igniter modules is 1 or N, N is the number of independent burners; the igniter is arranged in the first ignition independent burner area or each independent burner area.

5. The high-power surface combustion system suitable for treating high-concentration organic waste gas according to any one of claims 1 to 4, characterized in that: The high-power surface combustion system suitable for treating high-concentration organic waste gas operates as follows: (1) The air distribution system is started and the air is purged for a certain period of time. After the purge is completed, the valve opening is adjusted to the system operating state and maintained; (2) Waste heat recovery module starts; (3) The igniter module starts and maintains operation; (4) The combustion-supporting gas valve group corresponding to the first group of independent burners is opened, the combustion-supporting gas enters, and the surface burner is ignited; (5) The organic waste gas valve group corresponding to the first group of independent burners is gradually opened, the organic waste gas enters, and the surface burner is operated; (6) The organic waste gas valve group corresponding to the first group of independent burners is fully opened, and the flow rate F of the organic waste gas or the combustion chamber temperature T is monitored. When the load exceeds the design load of the first independent burner, the second independent burner is opened; (7) The combustion-supporting gas valve group corresponding to the second group of independent burners is opened, the combustion-supporting gas enters, and the surface burner is ignited; (8) The organic waste gas valve group corresponding to the second group of independent burners is gradually opened, the organic waste gas enters, and the surface burner is operated; (9) The organic waste gas valve group corresponding to the second group of independent burners is fully opened, and the flow rate F of the organic waste gas or the combustion chamber temperature T is monitored. When the design load of the second independent burner is exceeded, the third independent burner is opened; (10) The flow rate F of the organic waste gas or the temperature T of the combustion chamber does not exceed the design load after the nth group of independent burners is turned on, where n is not greater than N, and N is the number of independent burners; within the design load range, the system maintains operation; (11) The combustion-supporting valve group adjusts and replenishes the combustion calorific value in time according to the temperature T of the combustion chamber to maintain the normal operation of the system; (12) The amount of organic waste gas to be treated is reduced or shut down, and the independent burners are gradually shut down according to the configured flow rate F, concentration C or temperature T monitoring until all independent burners are completely shut down; (13) All exhaust valve groups are closed, and all combustion-supporting gas valve groups are closed; (14) The waste heat recovery module is closed; (15) The air distribution system is shut down and the system is shut down.

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