An oil-containing sewage open liquid surface high-concentration VOCs waste gas pollution reduction and carbon emission reduction system

Abstract

The present invention relates to the field of waste gas treatment, and specifically to a system for reducing pollution and carbon emissions from high-concentration VOCs waste gas at the open liquid surface of oily wastewater, comprising a safety feedforward control system, a deacidification and deoiling coordinated control system, and a regenerative thermal incinerator system connected in sequence; wherein the safety feedforward control system comprises a regulating valve, an air mixing homogenizing tank, and a safety instrument connected in sequence; the deacidification and deoiling coordinated control system comprises a deacidification tower, a demister, a flame damper, an oil removal tank, and a shut-off valve connected in sequence; and the regenerative thermal incinerator system comprises a front mixing air box, an RTO blower, a regenerative thermal incinerator system, a rear mixing air box, and a chimney connected in sequence. The present invention designs a VOCs waste gas model for a petrochemical oily wastewater pool, which establishes a relevant mathematical model based on parameters such as the temperature, ventilation times, water volume treated, and COD of the oily wastewater pool to evaluate the emission characteristics of the waste gas from the oily wastewater pool, and performs specific optimization design of the subsequent system based on the data.

Description

Technical Field

[0001] The present invention relates to the field of waste gas treatment, and in particular to a system for reducing pollution and carbon emissions from high-concentration VOCs waste gas at the exposed liquid surface of oily wastewater. Background Art

[0002] Wastewater treatment plants at petrochemical enterprises primarily treat wastewater generated by various facilities within the enterprise (including production wastewater, oily wastewater, and domestic wastewater). These facilities typically include homogenization tanks, regulating tanks, emergency tanks, oil separators, flotation tanks, flotation cells, aeration tanks, and other treatment facilities. Most of these facilities are open structures, generating large amounts of waste gas. These are a significant source of VOCs within petrochemical enterprises, severely impacting the surrounding environment. Wastewater treatment plant emissions primarily consist of benzene, hydrogen sulfide, non-methane hydrocarbons, and other hazardous waste gases, characterized by high volumes and complex composition.

[0003] At present, the treatment technologies that are widely used in the treatment of waste gas in sewage treatment plants of petrochemical enterprises are mainly: catalytic oxidation, adsorption, biological treatment, etc. Since the waste gas contains sulfides (organic and inorganic), it is easy to cause catalyst poisoning and cannot remove gases with high greenhouse effects such as methane, so the use of catalytic oxidation is limited. The adsorption method is generally suitable for the treatment of medium and low concentration waste gas, and it does not completely remove pollutants, but only transfers pollutants, and has almost no removal effect on C1 to C3 VOCs. The biological method is suitable for the treatment of low-concentration, water-soluble, and biodegradable VOCs waste gas. It has poor adaptability to the concentration fluctuation of waste gas and occupies a large area. The above-mentioned processes mainly have problems such as low removal rate, poor stability, low safety, ineffective removal of VOCs, and inability to reduce carbon emissions in the process of treating high-concentration waste gas from sewage plants. Summary of the Invention

[0004] In view of the problems existing in the prior art, the purpose of the present invention is to provide a system for reducing pollution and carbon emissions from high-concentration VOCs waste gas at the exposed liquid surface of oily wastewater.

[0005] The purpose of the present invention is achieved by adopting the following technical solutions:

[0006] A pollution reduction and carbon reduction system for high-concentration VOCs waste gas at the open liquid surface of oily wastewater, comprising a safety feedforward control system, a deacidification and deoiling coordinated control system and a thermal storage incinerator system connected in sequence; wherein the safety feedforward control system comprises a regulating valve, an air mixing homogenizing tank and a safety instrument connected in sequence; the deacidification and deoiling coordinated control system comprises a deacidification tower, a demister, a flame arrester, an oil removal tank and a shut-off valve connected in sequence; the thermal storage incinerator system comprises a front mixing air box, an RTO fan, a thermal storage incinerator system, a rear mixing air box and a chimney connected in sequence.

[0007] Preferably, the oily wastewater exposed liquid surface high-concentration VOCs waste gas pollution reduction and carbon reduction system also includes a bypass system, and the bypass system is connected to the deacidification and deoiling coordinated control system.

[0008] More preferably, the bypass system includes a bypass valve and a zeolite homogenization tank connected in sequence, and the bypass valve is connected to the oil removal tank of the deacidification and deoiling coordinated control system.

[0009] Preferably, the safety feedforward control system is connected to the deacidification and deoiling coordinated control system through a system induced draft fan, which collects the gas in the safety feedforward control system and introduces it into the deacidification and deoiling coordinated control system through a pipeline.

[0010] Preferably, the regenerative incinerator system includes a regulating valve, a heat bypass pipe, a regenerative incinerator, a burner, a fuel string, a back-suction pipe, a lifting valve, and a combustion-supporting fan; the regulating valve is arranged on the heat bypass pipe, one end of the heat bypass pipe is connected to the front mixing air box, and the other end is connected to the regenerative incinerator; the fuel string is arranged above the burner, and the burner is arranged above the regenerative incinerator; one end of the back-suction pipe is connected to the front mixing air box, and the other end is connected to the regenerative incinerator; one end of the lifting valve is connected to the RTO fan, and the other end is connected to the regenerative incinerator; the combustion-supporting fan is connected to the burner.

[0011] Preferably, an alkaline water elution layer is provided in the deacidification tower; the alkaline solution concentration of the alkaline water elution layer is 5%-10%, and the alkaline solution used is sodium hydroxide solution.

[0012] Preferably, the regenerative incinerator is provided with a heat storage filler, and the composition of the heat storage filler is calculated by weight and includes: 65-75 parts of cordierite ceramic powder, 20-30 parts of titanium-scandium alloy / scandium oxide composite powder, and 4-8 parts of montmorillonite powder.

[0013] Preferably, the particle size of the cordierite ceramic powder is 40-50 μm, and the composition calculated by mass fraction includes: 13.5% MgO, 34.9% Al2O3, 51.3% SiO2, and the rest are impurities.

[0014] Preferably, the purity of the montmorillonite powder is greater than 99%, and the particle size is 10-20 μm.

[0015] Preferably, the method for preparing the titanium-scandium alloy / scandium oxide composite powder comprises:

[0016] S1 weighed titanium-scandium alloy ground into powder, followed by deionized water, acetone and hydrochloric acid rinsed three times, then washed with deionized water until neutral, dried under vacuum conditions to obtain a titanium-scandium alloy pretreated product;

[0017] S2. The titanium-scandium alloy pre-treated product is placed inside the reactor and does not contact the bottom, and then the temperature of the reactor is set to 110-120 ° C, deionized water is introduced to form steam for reaction, and after the reaction is completed, a titanium-scandium alloy pre-reaction product is obtained;

[0018] S3. The titanium-scandium alloy pre-reaction product is placed in a vacuum drying oven and dried to constant weight, and then placed in a high-temperature furnace for sintering. After sintering, it is naturally cooled to room temperature in the furnace to obtain a titanium-scandium alloy / scandium oxide composite powder.

[0019] Preferably, in S1, the mass ratio of titanium to scandium in the titanium-scandium alloy is 3:1; after the titanium-scandium alloy is ground into powder, products with a particle size between 30-50 μm are collected.

[0020] Preferably, in S1, the concentration of hydrochloric acid is 0.05 mol / L.

[0021] Preferably, in S2, deionized water is introduced to react to form steam so that the internal pressure of the reactor is maintained at 0.1 MPa, and the reaction is terminated after keeping the temperature for 1 hour. After the reaction is completed, the temperature is restored to normal pressure.

[0022] Preferably, in S3, the sintering temperature is 950-1050°C, the sintering time is 2-4h, and the sintering heating rate is 3-5°C / min5.

[0023] Preferably, the preparation process of the heat storage filler is:

[0024] Cordierite ceramic powder, titanium-scandium alloy / scandium oxide composite powder and montmorillonite powder are weighed respectively, mixed evenly, pressed into blanks, and then sintered at high temperature to obtain a heat storage filler.

[0025] Preferably, the pressure for pressing the blank is 100-200 MPa, the temperature for high-temperature sintering is 1000-1100° C., and the sintering time is 2-4 hours.

[0026] The beneficial effects of the present invention are:

[0027] 1. The present invention designs a VOCs waste gas model for petrochemical oily wastewater pools. The model establishes a relevant mathematical model based on parameters such as the temperature, ventilation times, treated water volume, COD, etc. of the oily wastewater pool to evaluate the emission characteristics of the waste gas from the oily wastewater pool, and performs specific optimization design of the subsequent system based on the data. Advantages of this model: ① The model proposed based on parameters such as the temperature, ventilation times, treated water volume, COD, etc. of the oily wastewater pool can relatively accurately infer the average concentration and maximum concentration of the waste gas, providing a reliable design basis for the back-end design, avoiding the problem of design indicators being too low leading to substandard or too high leading to investment waste in previous projects; ② The model can effectively provide VOCs emission data, providing a reliable basis for the safety configuration of the back-end incineration system, and accurately selecting safety instruments (LEL) and quick shut-off valves with appropriate principles, greatly improving the safety of the overall system; ③ The model can effectively provide data such as VOCs emissions, providing relatively accurate production data for production enterprises, which can help to optimize the front-end production system, reduce material escape, synergistically reduce carbon emissions, and improve production efficiency.

[0028] 2. Safety feedforward control system. Conventional safety control systems only set LEL meters to cut off exhaust gas when the exhaust gas concentration is high. There are characteristics such as whether the selection of safety instruments is appropriate may lead to safety risks, and frequent tripping may lead to unstable production. The safety feedforward control system described in the present invention has the following advantages: ① LEL meters with appropriate principles are selected according to the VOCs components and concentrations to accurately judge the exhaust gas concentration and improve the safety of system control; ② Regulating valves and other facilities are configured to effectively homogenize the exhaust gas at the front end of the source exhaust gas, reduce the volatility of the exhaust gas, and smooth the source exhaust gas to improve the stability of the overall system and avoid frequent tripping; ③ The LEL meter is equipped with dehumidification and oil removal functions according to the characteristics of the water pool, and a variable loop control strategy is set to improve the response time of LEL.

[0029] 3. Deacidification and deoiling coordinated control system. The conventional pretreatment system is only for deacidification, but due to the particularity of the exhaust gas from the oily sewage pool, the deacidification system often cannot operate normally, the internal oil accumulates seriously, and there are safety hazards. The pretreatment system described in the present invention has the functions of deacidification, deoiling, and fire prevention, and has the following advantages: ① It adopts a high-efficiency filler pretreatment tower, which is equipped with a high-efficiency separation module while deacidifying to prevent alkali solution from being brought into the back end and causing system blockage; ② It is equipped with a deoiling system to effectively avoid the accumulation of oily substances in subsequent pipelines, and solves the safety hazards caused by oily pollutants; ③ At the same time, the system also has a fire prevention function, which effectively isolates the incineration system from the source exhaust gas, thereby improving the safety of the system.

[0030] 4. Regenerative heat incinerator system. This system is specifically designed for the VOCs waste gas characteristics of oily sewage pools, such as variable components, high concentrations, flammability, explosiveness, and corrosion. It has the following advantages, including: ① Equalization measures for furnace temperature and furnace fluid to achieve coordinated control of high-ignition-point greenhouse gases such as methane and VOCs; ② The key parts are made of heat-resistant steel to improve the system's thermal load impact capacity; ③ Equipped with a heat load regulation system to quickly release the heat accumulated inside the RTO furnace in an emergency; ④ A high-performance poppet valve with a sealing surface that combines air seals and hard seals, wear-resistant pre-treatment of the entire valve, and tested on a long-term test platform is used to achieve increasingly stringent emission standards; ⑤ Configured with a combined burner to adapt to different types of fuels, and can be equipped with waste liquid and high-concentration combustible waste gas spray guns to achieve coordinated treatment of some waste liquids and high-concentration combustible waste gases.

[0031] 5. The regenerative incinerator of the present invention is filled with a heat storage filler, which is formed by mixing and pressing cordierite ceramic powder, titanium-scandium alloy / scandium oxide composite powder, and montmorillonite powder. The titanium-scandium alloy / scandium oxide composite powder uses an alloy material containing titanium and scandium metal as its base material. After thermal oxidation treatment with water vapor, part of the metallic scandium gradually generates scandium hydroxide, forming a titanium-scandium alloy material coated with scandium hydroxide. Then, after high-temperature sintering, the scandium hydroxide gradually decomposes to generate scandium oxide, which coats the surface of the titanium-scandium alloy, thus obtaining the titanium-scandium alloy / scandium oxide composite powder. The cordierite ceramic powder, which has a heat storage function, is then combined with the titanium-scandium alloy / scandium oxide composite powder, using montmorillonite as a bonding material, to ultimately obtain the heat storage filler.

[0032] 6. Cordierite ceramic powder is a good heat storage material with excellent thermal stability and corrosion resistance. Titanium-scandium alloy material has a titanium to scandium ratio of 3:1. Compared with conventional aluminum-silicon alloy materials, it has high phase change latent heat, as well as the advantages of good thermal conductivity and good thermal stability. Using the titanium-scandium alloy as the inner core and the scandium oxide obtained by in-situ steam thermal oxidation as the coating structure further enhances the flexibility, corrosion resistance and thermal cycle stability of the titanium-scandium alloy. After the obtained titanium-scandium alloy / scandium oxide composite powder is compounded with cordierite ceramic powder, not only the high temperature resistance and heat transfer rate of the cordierite ceramic powder as a heat storage material are improved, but also the strength and durability of the cordierite ceramic powder are improved. The heat storage filler finally prepared by the present invention not only has a fast heat transfer rate and good thermal cycle performance, but also has high strength, good thermal stability and durability. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The present invention is further described with reference to the accompanying drawings. However, the embodiments in the accompanying drawings do not constitute any limitation to the present invention. A person skilled in the art can obtain other drawings based on the following drawings without creative effort.

[0034] Figure 1 Schematic diagram of a system for reducing pollution and carbon emissions from high-concentration VOCs waste gas at the exposed surface of oily wastewater according to Example 1 of the present invention;

[0035] Figure 2 yes Figure 1 An enlarged schematic diagram of the safety feedforward control system;

[0036] Figure 3 This is a comparison chart of the controlled LEL values before and after the exhaust gas concentration fluctuation detected in Example 1 of the present invention;

[0037] Figure 4 This is a data comparison chart of H2S concentration before and after the alkali washing tower detected in Example 1 of the present invention;

[0038] Figure 5 This is a comparison chart of moisture content change data before and after gas-liquid separation detected in Example 1 of the present invention;

[0039] Figure 6 This is a comparison chart of the exhaust gas temperatures after passing through the front and rear air mixing boxes detected in Example 1 of the present invention;

[0040] Figure 7 This is a comparison chart of the relative humidity of exhaust gas passing through the front and rear air mixing boxes detected in Example 1 of the present invention;

[0041] Figure 8 This is a comparison chart of CH4 and NMHC contents in exhaust gas before and after RTO treatment detected in Example 1 of the present invention;

[0042] Figure 9 This is a comparison chart of the NMHC content in the exhaust gas before and after RTO treatment detected in Example 1 of the present invention.

[0043] Figure numerals: 1-air mixing homogenization tank, 2-regulating valve, 3-safety instrument, 4-system induced draft fan, 5-deacidification tower, 6-demister, 7-fire arrester, 8-oil removal tank, 9-shut-off valve, 10-bypass valve, 11-zeolite homogenization tank, 12-front air mixing box, 13-regulating valve, 14-thermal bypass pipe, 15-RTO fan, 16-lift valve, 17-back suction pipe, 18-regenerative incinerator, 19-burner, 20-fuel string, 21-combustion-supporting fan, 22-rear air mixing box, 23-chimney, 24-down valve. DETAILED DESCRIPTION

[0044] In order to more clearly illustrate the present invention and have a clearer understanding of the technical features, objectives and beneficial effects of the present invention, the technical solution of the present invention is now described in detail below, but it should not be understood as limiting the scope of implementation of the present invention.

[0045] The present invention relates to a coordinated carbon reduction control technology for high-concentration VOCs in the petrochemical industry. The technology includes the use of a petrochemical oily wastewater pool waste gas model to achieve optimized design, a safety feedforward control system, a coordinated deacidification and deoiling control system, a regenerative thermal incinerator system, a power system, and a bypass system. Its working principle is as follows: first, the safety feedforward control system is used to ensure the safety and stability of the waste gas source collection system, and a pretreatment system is used to remove acidic pollutants in the waste gas, and to prevent oily pollutants in the waste gas from accumulating in the system and causing accidents such as explosions. Under the action of the power system, the waste gas enters the regenerative thermal incinerator for oxidative decomposition to achieve standard emissions; at the same time, a bypass system and a control system are configured to control the safety of the entire system.

[0046] The arrangement of the model system device of the present invention is shown in Table 1:

[0047] Table 1. Components of the model system of the present invention

[0048]

[0049]

[0050] The patent of this invention relates to the coordinated carbon reduction control technology for high-concentration VOCs in the petrochemical industry, which includes the application of the waste gas model of the petrochemical oily sewage pool to achieve optimized design, a safety feedforward control system, a coordinated deacidification and deoiling control system, a regenerative incinerator system, as well as a power system and a bypass system. Its working principle is: first, the safety feedforward control system is used to ensure the safety and stability of the waste gas source collection system, and the pretreatment system is used to remove acidic pollutants in the waste gas, and to prevent oily pollutants in the waste gas from accumulating in the system and causing explosions and other accidents. Under the action of the power system, the waste gas enters the regenerative incinerator for oxidation and decomposition to achieve standard emissions; at the same time, a bypass system and a control system are configured to control the safety of the entire system.

[0051] By utilizing the sewage and waste gas operating model and the overall system, we can achieve effective VOCs control and coordinated carbon reduction of waste gases with high greenhouse effects such as methane while ensuring safety.

[0052] 1) VOCs waste gas model for petrochemical oily wastewater pools. This model establishes a relevant mathematical model based on parameters such as temperature, air exchange times, treated water volume, COD, etc., to evaluate the emission characteristics of waste gas from oily wastewater pools, and to optimize the subsequent system design based on this data.

[0053] 2) Safety feedforward control system, which is equipped with regulating valves, LEL monitoring instruments, etc., to monitor the exhaust gas concentration from the oily wastewater pool from the source and adjust and control it in time to achieve the purpose of balanced homogeneity;

[0054] 3) Deacidification and deoiling coordinated control system. The VOCs waste gas from the oily wastewater pool in the petrochemical industry has the characteristics of complex components, variable concentrations, high moisture content, high oiliness, easy corrosion, flammability and explosion. Therefore, a pretreatment system is required to perform deacidification and deoiling of the VOCs waste gas to avoid corrosion of subsequent treatment equipment and solve the risk of explosion caused by the accumulation of oily pollutants. At the same time, the system has a fire-blocking function to prevent the open flame equipment at the back end from damaging the front-end collection agent production system.

[0055] 4) Regenerative incinerator system. This system is specifically designed for the VOCs waste gas components in oily sewage pools, which are variable, highly concentrated, flammable, explosive, and corrosive. The system includes: ① measures to equalize the furnace temperature and furnace fluid to achieve coordinated control of high-ignition-point greenhouse gases such as methane and VOCs; ② materials for key parts are made of materials with fast heat transfer and good thermal cycle performance; ③ a heat load regulation system is equipped to quickly release the heat accumulated inside the RTO furnace in an emergency; ④ a high-performance poppet valve with a sealing surface that combines air seals and hard seals, wear-resistant pretreatment of the entire valve, and long-term test platform testing to achieve increasingly stringent emission standards; ⑤ a combined burner is configured to adapt to different types of fuels, and it can be equipped with waste liquid and high-concentration combustible waste gas spray guns to achieve coordinated treatment of some waste liquids and high-concentration combustible waste gases.

[0056] 5) Power system, which is used to overcome the resistance of the collection system and the exhaust gas treatment system, ensure the effective negative pressure collection of the exhaust gas and reduce the escape;

[0057] 6) Bypass system is a safety bypass system equipped with flow, zeolite homogenizing tank and other systems for safe emergency discharge of exhaust gas in emergency situations.

[0058] Unless otherwise specified, the raw materials, reagents, or devices used in the following examples can be obtained from conventional commercial sources or by existing known methods.

[0059] The present invention is further described with reference to the following examples.

[0060] Example 1

[0061] A pollution reduction and carbon reduction system for high-concentration VOCs waste gas at the open liquid surface of oily wastewater, comprising a safety feedforward control system, a deacidification and deoiling coordinated control system and a regenerative incinerator system connected in sequence; wherein the safety feedforward control system comprises a regulating valve 2, an air mixing homogenization tank 1 and a safety instrument 3 connected in sequence; the deacidification and deoiling coordinated control system comprises a deacidification tower 5, a demister 6, a flame arrester 7, an oil removal tank 8 and a shut-off valve 9 connected in sequence; the regenerative incinerator system comprises a front mixing air box 12, an RTO fan 15, a regenerative incinerator system, a rear mixing air box 22 and a chimney 23 connected in sequence.

[0062] The pollution reduction and carbon reduction system for high-concentration VOCs waste gas at the open liquid surface of oily wastewater also includes a bypass system, which is connected to the deacidification and deoiling coordinated control system. The bypass system includes a bypass valve 10 and a zeolite homogenization tank 11 connected in sequence. The bypass valve 10 is connected to the deoiling tank 8 of the deacidification and deoiling coordinated control system. The safety feedforward control system is connected to the deacidification and deoiling coordinated control system through the system induced draft fan 4. The system induced draft fan 4 collects the gas in the safety feedforward control system and introduces it into the deacidification and deoiling coordinated control system through a pipeline.

[0063] The regenerative incinerator system includes a regulating valve 13, a hot bypass pipe 14, a regenerative incinerator 18, a burner 19, a fuel string 20, a back-suction pipe 17, a lifting valve 16, a down-flow valve 24, and a combustion-supporting fan 21; the regulating valve 13 is arranged on the hot bypass pipe 14, one end of the hot bypass pipe 14 is connected to the front mixing air box 12, and the other end is connected to the regenerative incinerator 18; the fuel string 20 is arranged above the burner 19, and the burner 19 is arranged above the regenerative incinerator 18; one end of the back-suction pipe 17 is connected to the front mixing air box 12, and the other end is connected to the regenerative incinerator 18; one end of the lifting valve 16 is connected to the RTO fan 15, and the other end is connected to the regenerative incinerator 18; one end of the down-flow valve 24 is connected to the rear mixing air box 22, and the other end is connected to the regenerative incinerator 18; the combustion-supporting fan 21 is connected to the burner 19.

[0064] An alkaline water elution layer is provided in the deacidification tower 5; the alkaline solution concentration of the alkaline water elution layer is 5%-10%, and the alkaline solution used is sodium hydroxide solution.

[0065] The regenerative incinerator 18 is provided with a regenerative filler, and the composition of the regenerative filler is calculated by weight and includes: 70 parts of cordierite ceramic powder, 25 parts of titanium-scandium alloy / scandium oxide composite powder, and 6 parts of montmorillonite powder.

[0066] The cordierite ceramic powder has a particle size of 40-50 μm and a composition calculated by mass of 13.5% MgO, 34.9% Al2O3, 51.3% SiO2, and the remainder is impurities. The montmorillonite powder has a purity of >99% and a particle size of 10-20 μm.

[0067] The preparation method of titanium-scandium alloy / scandium oxide composite powder comprises:

[0068] S1 weighed titanium scandium alloy ground into powder, followed by deionized water, acetone and 0.05mol / L of hydrochloric acid were rinsed three times, and then washed with deionized water until neutral, dried under vacuum conditions to obtain a titanium scandium alloy pretreatment product;

[0069] The titanium-scandium alloy has a mass ratio of titanium to scandium of 3:1. After the titanium-scandium alloy is ground into powder, products with a particle size between 30 and 50 μm are collected.

[0070] S2. The titanium-scandium alloy pre-treated product was placed inside the reactor without contacting the bottom, and then the temperature of the reactor was set to 120°C. Deionized water was introduced to form steam so that the pressure inside the reactor was maintained at 0.1 MPa. The reaction was carried out for 1 hour. After the reaction was completed, the temperature and pressure were returned to normal to obtain a titanium-scandium alloy pre-reaction product.

[0071] S3. Place the titanium-scandium alloy pre-reaction product in a vacuum drying oven and dry it to constant weight. Then, place it in a high-temperature furnace and sinter it at a sintering temperature of 1000°C, a sintering time of 3 hours, and a sintering heating rate of 4°C / min3. After sintering, cool it naturally to room temperature in the furnace to obtain a titanium-scandium alloy / scandium oxide composite powder.

[0072] The preparation process of the above-mentioned heat storage filler is as follows:

[0073] Cordierite ceramic powder, titanium-scandium alloy / scandium oxide composite powder and montmorillonite powder are weighed respectively, mixed evenly, and then pressed into a blank at a pressure of 150 MPa, and then sintered at a high temperature of 1050°C and a sintering time of 3 hours to obtain a thermal storage filler.

[0074] Example 2

[0075] A pollution reduction and carbon reduction system for high-concentration VOCs waste gas at the open liquid surface of oily wastewater has the same structure as that of Example 1, except that the composition of the heat storage filler arranged in the heat storage incinerator 18 is different.

[0076] The components of the heat storage filler are calculated by weight and include: 65 parts of cordierite ceramic powder, 30 parts of titanium-scandium alloy / scandium oxide composite powder, and 4 parts of montmorillonite powder.

[0077] The cordierite ceramic powder has a particle size of 40-50 μm and a composition calculated by mass of 13.5% MgO, 34.9% Al2O3, 51.3% SiO2, and the remainder is impurities. The montmorillonite powder has a purity of >99% and a particle size of 10-20 μm.

[0078] The preparation method of titanium-scandium alloy / scandium oxide composite powder comprises:

[0079] S1 weighed titanium scandium alloy ground into powder, followed by deionized water, acetone and 0.05mol / L of hydrochloric acid were rinsed three times, and then washed with deionized water until neutral, dried under vacuum conditions to obtain a titanium scandium alloy pretreatment product;

[0080] Among them, the mass ratio of titanium to scandium in the titanium-scandium alloy is 3:1; after the titanium-scandium alloy is ground into powder, products with a particle size between 30-50μm are collected.

[0081] S2. The titanium-scandium alloy pre-treated product was placed inside the reactor without contacting the bottom, and then the temperature of the reactor was set to 110°C. Deionized water was introduced to form steam so that the pressure inside the reactor was maintained at 0.1 MPa. The reaction was carried out for 1 hour. After the reaction was completed, the temperature and pressure were returned to normal to obtain a titanium-scandium alloy pre-reaction product.

[0082] S3. Place the titanium-scandium alloy pre-reaction product in a vacuum drying oven and dry it to constant weight. Then, place it in a high-temperature furnace for sintering at a temperature of 950°C, a sintering time of 4 hours, and a sintering heating rate of 3°C / min3. After sintering, cool it naturally to room temperature in the furnace to obtain a titanium-scandium alloy / scandium oxide composite powder.

[0083] The preparation process of the above-mentioned heat storage filler is as follows:

[0084] Cordierite ceramic powder, titanium-scandium alloy / scandium oxide composite powder and montmorillonite powder are weighed respectively, mixed evenly, and then pressed into a blank at a pressure of 100 MPa, and then sintered at a high temperature of 1000°C and a sintering time of 4 hours to obtain a thermal storage filler.

[0085] Example 3

[0086] A pollution reduction and carbon reduction system for high-concentration VOCs waste gas at the open liquid surface of oily wastewater has the same structure as that of Example 1, except that the composition of the heat storage filler arranged in the heat storage incinerator 18 is different.

[0087] The components of the heat storage filler are calculated by weight and include: 75 parts of cordierite ceramic powder, 20 parts of titanium-scandium alloy / scandium oxide composite powder, and 8 parts of montmorillonite powder.

[0088] The cordierite ceramic powder has a particle size of 40-50 μm and a composition calculated by mass of 13.5% MgO, 34.9% Al2O3, 51.3% SiO2, and the remainder is impurities. The montmorillonite powder has a purity of >99% and a particle size of 10-20 μm.

[0089] The preparation method of titanium-scandium alloy / scandium oxide composite powder comprises:

[0090] S1 weighed titanium scandium alloy ground into powder, followed by deionized water, acetone and 0.05mol / L of hydrochloric acid were rinsed three times, and then washed with deionized water until neutral, dried under vacuum conditions to obtain a titanium scandium alloy pretreatment product;

[0091] Among them, the mass ratio of titanium to scandium in the titanium-scandium alloy is 3:1; after the titanium-scandium alloy is ground into powder, products with a particle size between 30-50μm are collected.

[0092] S2. The titanium-scandium alloy pre-treated product was placed inside the reactor without contacting the bottom, and then the temperature of the reactor was set to 120°C. Deionized water was introduced to form steam so that the pressure inside the reactor was maintained at 0.1 MPa. The reaction was carried out for 1 hour. After the reaction was completed, the temperature and pressure were returned to normal to obtain a titanium-scandium alloy pre-reaction product.

[0093] S3. Place the titanium-scandium alloy pre-reaction product in a vacuum drying oven and dry it to constant weight. Then, place it in a high-temperature furnace and sinter it at a sintering temperature of 1050°C, a sintering time of 2 hours, and a sintering heating rate of 5°C / min3. After sintering, cool it naturally to room temperature in the furnace to obtain a titanium-scandium alloy / scandium oxide composite powder.

[0094] The preparation process of the above-mentioned heat storage filler is as follows:

[0095] Cordierite ceramic powder, titanium-scandium alloy / scandium oxide composite powder and montmorillonite powder are weighed respectively, mixed evenly, and then pressed into a blank at a pressure of 100-200 MPa, and then sintered at a high temperature of 1100°C and a sintering time of 2 hours to obtain a thermal storage filler.

[0096] Comparative Example 1

[0097] A heat storage filler, which differs from Example 1 in that it has different ingredients.

[0098] The components of the heat storage filler are calculated by weight and include: 95 parts of cordierite ceramic powder and 6 parts of montmorillonite powder.

[0099] The cordierite ceramic powder has a particle size of 40-50 μm and a composition calculated by mass of 13.5% MgO, 34.9% Al2O3, 51.3% SiO2, and the remainder is impurities. The montmorillonite powder has a purity of >99% and a particle size of 10-20 μm.

[0100] The preparation process of the above-mentioned heat storage filler is as follows:

[0101] Cordierite ceramic powder and montmorillonite powder are weighed respectively, mixed evenly, and then pressed into a green body at a pressure of 150 MPa, and then sintered at a high temperature of 1050°C for 3 hours to obtain a thermal storage filler.

[0102] Comparative Example 2

[0103] A heat storage filler, which differs from Example 1 in that it has different ingredients.

[0104] The components of the heat storage filler are calculated by weight and include: 95 parts of cordierite ceramic powder, 25 parts of scandium oxide powder, and 6 parts of montmorillonite powder.

[0105] The cordierite ceramic powder has a particle size of 40-50 μm and its composition, calculated by mass, includes 13.5% MgO, 34.9% Al₂O₃, 51.3% SiO₂, with the remainder being impurities. The montmorillonite powder has a purity of >99% and a particle size of 10-20 μm. The scandium oxide powder has a purity of >99% and a particle size of 30-50 μm.

[0106] The preparation process of the above-mentioned heat storage filler is as follows:

[0107] Cordierite ceramic powder, scandium oxide powder and montmorillonite powder are weighed respectively, mixed evenly, and then pressed into a green body at a pressure of 150 MPa, and then sintered at a high temperature of 1050°C and a sintering time of 3 hours to obtain a thermal storage filler.

[0108] Comparative Example 3

[0109] A heat storage filler, which differs from Example 1 in that it has different ingredients.

[0110] The components of the heat storage filler are calculated by weight and include: 95 parts of cordierite ceramic powder, 25 parts of titanium-scandium alloy powder, and 6 parts of montmorillonite powder.

[0111] The cordierite ceramic powder has a particle size of 40-50 μm and a composition calculated by mass of 13.5% MgO, 34.9% Al2O3, 51.3% SiO2, and the remainder is impurities. The montmorillonite powder has a purity of >99% and a particle size of 10-20 μm.

[0112] In the titanium-scandium alloy powder, the mass ratio of titanium to scandium is 3:1, and the particle size is 30-50μm.

[0113] The preparation process of the above-mentioned heat storage filler is as follows:

[0114] Cordierite ceramic powder, titanium-scandium alloy powder and montmorillonite powder are weighed respectively, mixed evenly, and then pressed into a blank at a pressure of 150 MPa, and then sintered at a high temperature of 1050°C and a sintering time of 3 hours to obtain a heat storage filler.

[0115] (1) In order to more clearly illustrate the content of the present invention, the performance of the heat storage fillers obtained in Example 1 and Comparative Examples 1-3 was tested. The test results are shown in Table 2 below.

[0116] Table 2 Performance of different thermal storage fillers

[0117]

[0118]

[0119] In Table 1 above, specific heat capacity is the test data at 20-1000℃; thermal conductivity is the test data at 20-1000℃; thermal expansion coefficient is the test data at 20-800℃; compressive strength test refers to GB / T3810.2; thermal shock resistance is the number of times the material is subjected to 1000℃ insulation treatment for 30min5, rapid water cooling, and then cycled until thermal shock damage occurs.

[0120] As can be seen from Table 1, the heat storage filler prepared in Example 1 of the present invention has higher specific heat capacity, thermal conductivity, high temperature resistance, compressive strength, thermal shock resistance, and lower thermal expansion coefficient, indicating that it has good heat resistance, strong heat transfer, excellent thermal stability, higher strength, and is more durable.

[0121] (2) The present invention also analyzes and records data on the safety feedforward control system of the high-concentration VOCs waste gas pollution reduction and carbon reduction system in Example 1 before and after the waste gas concentration fluctuation. The data comes from the Jilin Petrochemical Refinery. The results are shown in Table 3 and the line graph is as follows. Figure 3 As shown, the LEL2 average value is the average of the LEL2A value, LEL2B value, and LEL2C value. Figure 3 The line graph reflects the data comparison between the value of LEL1 (before exhaust gas concentration control) and the average value of LEL2 (after exhaust gas concentration control).

[0122] Table 3 Controlled LEL values before and after exhaust gas concentration fluctuations (%)

[0123] Exhaust gas number LEL1 value LEL2 average value LEL2A value LEL2B value LEL2C value 1 15.3 11.50 11.1 10.9 12.5 2 19.6 11.33 10.7 11.2 12.1 3 18.7 12.10 11.9 12.3 12.1 4 19.5 11.60 11.6 10.8 12.4 5 16.1 11.20 11.3 10.8 11.5 6 19.2 11.60 10.5 12.5 11.8 7 17.4 11.67 11.5 10.5 13.0 8 20.9 10.67 11.2 10.3 10.5 9 18.9 10.40 10.2 9.8 11.2 10 15.3 11.47 12.1 10.2 12.1

[0124] From Table 3 and Figure 3 It can be seen that the safety feedforward control system of the present invention can stabilize exhaust gases of different concentrations at almost the same level, thereby obtaining a more stable exhaust gas system and facilitating subsequent processing.

[0125] (3) The present invention also tested the concentration change of H2S before and after the alkali washing tower for the deacidification and deoiling coordinated control system of the high-concentration VOCs waste gas pollution reduction and carbon reduction system in Example 1, and also tested the moisture content before and after gas-liquid separation. The data came from Jilin Petrochemical Refinery, and the results are shown in Table 4. Figure 4 and Figure 5 .

[0126] Table 4 H2S concentration data before and after the alkali washing tower and moisture content change data before and after gas-liquid separation

[0127]

[0128]

[0129] From Table 4, Figure 4 and Figure 5 It can be seen that the deacidification and deoiling coordinated control system of the present invention can control the H2S content in the exhaust gas to a relatively low level, and the moisture content after gas-liquid separation is also reduced by nearly half.

[0130] (4) The present invention also tests the exhaust gas temperature and exhaust gas relative humidity of the front mixing air box and the rear mixing air box of the regenerative incinerator system of the high-concentration VOCs exhaust gas pollution reduction and carbon reduction system in Example 1. The data comes from Jilin Petrochemical Refinery. The results are shown in Table 5. Figure 6 and Figure 7 shown.

[0131] Table 5 Test results of exhaust gas temperature and relative humidity of front and rear air mixing boxes

[0132]

[0133] From Table 5, Figure 6 and Figure 7 It can be seen that the temperature of the exhaust gas increases by about 10°C in the process of passing through the front mixing box and the rear mixing box, while the humidity decreases by about half.

[0134] (5) The present invention also focuses on the CH4 content and removal rate, NMHC (non-methane hydrocarbons) content and removal rate in the exhaust gas before and after treatment by the regenerative thermal incinerator system (RTO) of the high-concentration VOCs exhaust gas pollution reduction and carbon reduction system in Example 1. The data comes from Jilin Petrochemical Refinery, and the results are shown in Table 6. Figure 8 and Figure 9 shown.

[0135] Table 6 CH4 and NMHC content and removal rate in exhaust gas before and after RTO treatment

[0136]

[0137]

[0138] From Table 6, Figure 8 and Figure 9 It can be seen that the CH4 removal rate of the exhaust gas after being treated by the regenerative thermal incinerator system (RTO) can reach up to 99.33%, and the NMHC (non-methane hydrocarbons) removal rate can reach up to 99.85%. Therefore, it can be seen that the exhaust gas treatment system of the present invention has a very good removal rate for VOCs exhaust gas.

[0139] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A system for reducing pollution and carbon emissions from high-concentration VOCs waste gas at the open surface of oily wastewater, characterized in that: It includes a safety feedforward control system, a deacidification and deoiling coordinated control system and a regenerative incinerator system connected in sequence; wherein the safety feedforward control system includes a regulating valve, an air mixing homogenizing tank and a safety instrument connected in sequence; the deacidification and deoiling coordinated control system includes a deacidification tower, a demister, a flame arrester, an oil removal tank and a shut-off valve connected in sequence; the regenerative incinerator system includes a front mixing air box, an RTO fan, a regenerative incinerator system, a rear mixing air box and a chimney connected in sequence; The regenerative incinerator system includes a regulating valve, a heat bypass pipe, a regenerative incinerator, a burner, a fuel string, a back-suction pipe, a poppet valve, and a combustion-supporting fan; The regenerative incinerator is provided with a heat storage filler, and the components of the heat storage filler are calculated by weight and include: 65-75 parts of cordierite ceramic powder, 20-30 parts of titanium-scandium alloy / scandium oxide composite powder, and 4-8 parts of montmorillonite powder.

2. The system for reducing pollution and carbon emissions from high-concentration VOCs waste gas at the open surface of oily wastewater according to claim 1 is characterized in that: The oily wastewater open liquid surface high-concentration VOCs waste gas pollution reduction and carbon reduction system also includes a bypass system, which is connected to the deacidification and deoiling coordinated control system; the bypass system includes a bypass valve and a zeolite homogenization tank connected in sequence, and the bypass valve is connected to the oil removal tank of the deacidification and deoiling coordinated control system.

3. The system for reducing pollution and carbon emissions from high-concentration VOCs waste gas at the open surface of oily wastewater according to claim 1, characterized in that: The safety feedforward control system is connected to the deacidification and deoiling coordinated control system through a system induced draft fan. The system induced draft fan collects the gas in the safety feedforward control system and introduces the gas into the deacidification and deoiling coordinated control system through a pipeline.

4. The system for reducing pollution and carbon emissions from high-concentration VOCs waste gas at the open surface of oily wastewater according to claim 1, characterized in that: The regulating valve is arranged on the hot bypass pipe, one end of the hot bypass pipe is connected to the front mixing air box, and the other end is connected to the regenerative incinerator; the fuel string is arranged above the burner, and the burner is arranged above the regenerative incinerator; one end of the back-suction pipe is connected to the front mixing air box, and the other end is connected to the regenerative incinerator; one end of the lifting valve is connected to the RTO fan, and the other end is connected to the regenerative incinerator; the combustion-supporting fan is connected to the burner.

5. The system for reducing pollution and carbon emissions from high-concentration VOCs waste gas at the open surface of oily wastewater according to claim 1, characterized in that: An alkaline water elution layer is provided in the deacidification tower; the alkaline solution concentration of the alkaline water elution layer is 5%-10%, and the alkaline solution used is sodium hydroxide solution.

6. The system for reducing pollution and carbon emissions from high-concentration VOCs waste gas at the open surface of oily wastewater according to claim 1, characterized in that: The cordierite ceramic powder has a particle size of 40-50 μm, and its composition, calculated by mass fraction, includes: 13.5% MgO, 34.9% Al2O3, 51.3% SiO2, and the rest are impurities.

7. The system for reducing pollution and carbon emissions from high-concentration VOCs waste gas at the open surface of oily wastewater according to claim 1, characterized in that: The preparation method of the titanium-scandium alloy / scandium oxide composite powder comprises: S1 weighed titanium-scandium alloy ground into powder, followed by deionized water, acetone and hydrochloric acid rinsed three times, then washed with deionized water until neutral, dried under vacuum conditions to obtain a titanium-scandium alloy pretreated product; S2. The titanium-scandium alloy pre-treated product is placed inside the reactor and does not contact the bottom, and then the temperature of the reactor is set to 110-120 ° C, deionized water is introduced to form steam for reaction, and after the reaction is completed, a titanium-scandium alloy pre-reaction product is obtained; S3. The titanium-scandium alloy pre-reaction product is placed in a vacuum drying oven and dried to constant weight, and then placed in a high-temperature furnace for sintering. After sintering, it is naturally cooled to room temperature in the furnace to obtain a titanium-scandium alloy / scandium oxide composite powder.

8. The system for reducing pollution and carbon emissions from high-concentration VOCs waste gas at the open surface of oily wastewater according to claim 7, characterized in that: In S1, the mass ratio of titanium to scandium in the titanium-scandium alloy is 3:1; after the titanium-scandium alloy is ground into powder, products with a particle size between 30-50 μm are collected; In S1, the concentration of hydrochloric acid is 0.05 mol / L; In S2, deionized water is introduced to form steam to react so that the internal pressure of the reactor is maintained at 0.1 MPa. The reaction is terminated after the temperature is kept at this temperature for 1 hour. After the reaction is completed, the temperature is returned to normal pressure. In the above-mentioned S3, the sintering temperature is 950-1050° C., the sintering time is 2-4 hours, and the sintering heating rate is 3-5° C. / min.

9. The system for reducing pollution and carbon emissions from high-concentration VOCs waste gas at the open surface of oily wastewater according to claim 1, characterized in that: The preparation process of the heat storage filler is as follows: The cordierite ceramic powder, the titanium-scandium alloy / scandium oxide composite powder and the montmorillonite powder are weighed respectively, mixed evenly, pressed into a green body, and then sintered at a high temperature to obtain a thermal storage filler. The pressing pressure of the blank is 100-200 MPa, the high temperature sintering temperature is 1000-1100°C, and the sintering time is 2-4 hours.

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