TW201924769A - Regenerative catalytic oxidizer for the abatement of VOCs laden gases - Google Patents

Abstract

This invention provides a novel regenerative catalytic oxidizer (RCO) for the abatement of VOCs laden gases. The said RCO is composed of at least two packed bed canisters, a high temperature oxidation reaction chamber connecting the said packed bed canisters, a set of bypass passages inside the packed bed canisters consist of higher porosity and lower capacity packing material in the said packed bed canisters, a layer of catalytic bed above the packed bed, a set of auto-controlled dampers connecting to the said bypass passages, and a programmable logic control system for temperature control. The said novel RCO consists of continuous feeding of combustible VOCs laden gases into the said packed bed canister, preheating the VOCs laden gases in the packed bed, oxidizing the VOCs at elevated temperature in the high temperature oxidation reaction chamber and catalytic beds, eliminating the over temperature of the combustion chamber due to high concentration of VOCs laden gases by adjusting the opening of the dampers for quick passages. The VOCs laden gases are destructed completely in the said regenerative catalytic oxidizer. The transient over temperature is eliminated by the bypassing of VOCs laden gases to the said oxidation reaction chamber through the said bypass passages when the concentration of inlet VOCs laden gases is higher than design value.

Description

Thermal storage regenerative catalytic oxidizer for treating VOCs exhaust gas

The main purpose of the present invention is to provide a Regenerative Catalytic Oxidizer (RCO) for treating VOC exhaust gas, which is characterized in that a cold bypass fast path and a flow control valve are provided in the catalytic heat storage chamber, and the high temperature oxidation is performed. The reaction chamber over-temperature logic controller allows some VOCs to be kept at a lower temperature and directly enters the high-temperature oxidation reaction chamber, which can completely solve the high-temperature oxidation that occurs when the regenerative regenerative catalytic oxidizer (RCO) exceeds the VOC exhaust gas concentration. The problem of overheating and explosion in the reaction chamber.

Volatile Organic Compounds (VOCs) are one of the common air pollutants in the industry. Their main sources are chemical, petrochemical, rubber, plastics, printing, coating, tape, and circuit boards. And the emerging high-tech semiconductor integrated circuit manufacturing and optoelectronic liquid crystal display industry in recent years. Because VOCs are toxic and easily destroy the atmospheric ozone layer, they must be controlled to avoid harm to the global environment. The currently developed and commercialized VOCs pollution prevention equipment technology includes incineration, adsorption, absorption, condensation and the like, which can be basically divided into two methods: destructive and non-destructive. Destructive methods include incineration, high temperature oxidation and catalyst oxidation. Under this mechanism, VOCs will be converted into CO ₂ and water or other inert materials such as less polluting; non-destructive methods use adsorption, absorption and condensation. Physically, VOCs are physically transferred from the exhaust gas to make it a clean gas.

At present, commercialization technology generally uses low-concentration exhaust gas (<10-20mg/m ³ ) for active carbon adsorption treatment, and low-concentration exhaust gas (50-1000mg/m ³ ) for adsorption concentration/desorption incineration. Treatment, medium-concentration exhaust gas (500-5,000mg/m ³ ) is treated by regenerative oxidation (RTO) or thermal catalytic oxidation (RCO), and high-concentration exhaust gas (>5,000-10,000mg/m ³ ) is incinerated by flame ( DFTO), high temperature pulse wave reactor combined with RTO (PDR-RTO), condensation recovery treatment. If the medium or low concentration sulfur or nitrogen component is odorous, it can be treated by chemical washing. However, all the above-mentioned common processing methods have their advantages and disadvantages and applications. Especially for the case of high concentration of VOCs, the current commercial processing methods, in addition to the PDR-RTO accident, are costly and easy to handle. Trouble with the risk of explosion or fire.

The regenerative thermal catalytic oxidation (RCO) method is to fill a layer of porous catalytic material and a porous protective material on the top of the regenerator bed, and to control the optimum catalytic reaction temperature between 300 and 450 ° C in the high temperature oxidation reaction chamber by using the low temperature oxidation characteristics of the catalyst. The temperature provides the VOC exhaust gas catalytic reaction conditions to meet the requirements for destruction efficiency. However, due to the high sensitivity of the catalyst to temperature, the temperature control of the high temperature oxidation reaction chamber becomes an extremely important parameter.

A typical heat storage regenerative catalytic oxidizer (RCO) is shown in Figure 1. The heat storage regeneration type catalytic oxidizer 1 includes at least two catalytic regenerators (including: a first catalytic regenerator 10, a second catalytic regenerator 20), and an intake control device (including: a first catalytic regenerator inlet valve 110, a first a second catalytic regenerator inlet valve 112), an outlet control device (including: a first catalytic regenerator exhaust valve 130, a second catalytic regenerator exhaust valve 132), heating device (including: combustion machine 60, auxiliary fuel supply line 201, auxiliary fuel flow regulating valve 202, air flow regulating valve 212) and temperature control device (including: combustion safety controller 300, temperature sensing transmitter 301) The regenerator is filled with a stone or ceramic heat storage material (including: a porous regenerator bed 12 of a first catalytic regenerator and a porous regenerator bed 22 of a second catalytic regenerator) and a porous catalyst bed (including: a first catalytic regenerator) The porous catalyst bed 13 and the porous catalyst bed 23 of the second catalytic regenerator.

When the heat storage regeneration type catalytic oxidizer 1 is started, the three-way bypass valve 102 is first closed, and the volatile organic chemical waste gas 100 is led to the volatile organic chemical waste gas bypass discharge port 150 through the volatile organic chemical waste gas bypass pipe 103; The valve 106 sends the air 210 in the air line 211 to the thermal storage regenerative catalytic oxidizer 1 through the catalytic regenerator inlet duct 108; then, the combustion engine 60 is started, and the temperature sensing transmitter 301 signal is used, and the combustion safety controller is used. 300 air-conditioning control flow regulating valve 212 and the pilot fuel flow rate control valve 202, the auxiliary fuel 200 through the auxiliary fuel supply line 201 to the combustor (30); first high temperature oxidation reaction chamber 50 raised to the operating temperature T _c, then start three To the bypass valve 102, the volatile organic chemical exhaust gas 100 is introduced into the system. The volatile organic chemical exhaust gas 100 to be treated is controlled by a three-way bypass valve 102 via a volatile organic chemical exhaust gas inlet pipe 102, and under normal operation, after being properly protected by the flame resistor 104, the catalytic regenerator The air inlet duct 108 first opens the first catalytic regenerator inlet valve 110, closes the first catalytic regenerator exhaust valve 130, and closes the second catalytic regenerator inlet valve 112 and opens the second catalytic regenerator exhaust valve 132. The VOCs exhaust gas is introduced into the first catalytic regenerator 10 through the first catalytic regenerator inlet pipe 111, and the gas first enters the inlet chamber 11 of the first catalytic regenerator, and is uniformly fed into the porous regenerator bed 12 of the first catalytic regenerator. After being heated to a certain temperature, it is partially oxidized by flowing through the porous catalyst bed 13 of the first catalytic regenerator, and then adjusted to the optimum catalytic reaction temperature through the high temperature oxidation chamber 50, and then sent to the second catalytic regenerator 20, The porous catalyst bed 23 of the second catalytic regenerator undergoes a high temperature catalytic oxidation reaction to completely destroy the VOCs in the VOCs-containing exhaust gas; thereafter, the high temperature gas flows through the porous regenerator bed 22 of the second catalytic regenerator The sensible heat of the high temperature gas is stored in the heat storage material of the porous heat storage bed 22 of the second cooled catalytic regenerator; the heat exchanged gas is mixed with the gas inlet chamber 21 of the second catalytic regenerator, and is lower. The temperature flows through the second catalytic regenerator exhaust duct 133 from the second catalytic regenerator exhaust valve 132 to the exhaust duct 144, is drawn by the induced exhaust fan 145, and exhausted through the exhaust exhaust duct 147 to the exhaust stack 80. After a certain period of time, the valve is switched, and the volatile organic chemical waste gas 100 to be treated is introduced into the high temperature bed second catalytic regenerator 20 that has stored energy, and the high temperature gas energy is stored in the first catalytic regenerator 10 after the reaction. , complete an operation cycle. The operation method is to close the first catalytic regenerator inlet valve 110, open the first catalytic regenerator exhaust valve 130, and open the second catalytic regenerator inlet valve 112 and close the second catalytic regenerator exhaust valve 132. The VOCs exhaust gas is introduced into the second catalytic regenerator 20 through the second catalytic regenerator inlet duct 113, and the gas first enters the inlet chamber 21 of the second catalytic regenerator, and is uniformly fed into the porous regenerator bed 22 of the second catalytic regenerator to be preheated to After a certain temperature, it is further oxidized by the porous catalyst bed 23 of the second catalytic regenerator, and then adjusted to the optimum catalytic reaction temperature by the high temperature oxidation chamber 50, and then sent to the first catalytic regenerator 10, first. The porous catalyst bed 13 of the catalytic regenerator performs a high-temperature catalytic oxidation reaction to completely destroy the VOCs in the VOCs-containing exhaust gas; thereafter, the high-temperature gas flows through the porous regenerator bed 12 of the first catalytic regenerator to store the sensible heat of the high-temperature gas. In the heat storage material of the porous heat storage bed 12 of the first cooled first catalytic regenerator; the heat exchanged gas is mixed with the gas inlet chamber 11 of the first catalytic regenerator, and then passed through the first temperature at a lower temperature. Regenerator exhaust duct 131, from the first catalyst regenerator exhaust valve 130 to the exhaust pipes 144, 145 by evacuating attractant exhaust fan, the exhaust 80 discharged through the exhaust duct 147 to the exhaust end of the chimney. Although RTO and RCO have been widely used in various fields, the practice of operation is accidental, and accidents such as over-temperature, tempering, and explosion have occurred frequently. The reason for this is usually caused by the front-end process disturbance, which causes the VOC exhaust gas concentration and flow rate to change rapidly, which causes the temperature of the high temperature oxidation reaction chamber of RTO and RCO to be out of control. For example, if the concentration of the volatile organic chemical exhaust gas 100 to be treated exceeds the original design concentration, when the volatile organic chemical exhaust gas 100 passes through the volatile organic chemical exhaust gas inlet pipe 101, it is controlled by the three-way bypass valve 102, and the flame retarder is controlled. After proper protection, 104 is passed through the catalytic regenerator inlet duct 108; the first catalytic regenerator inlet valve 110 is introduced into the first catalytic regenerator 10, and the gas is preheated in the porous regenerator bed 12 of the first catalytic regenerator to After a certain temperature, it is partially oxidized through the porous catalyst bed 13 of the first catalytic regenerator, and then sent to the high temperature oxidation chamber 50. At this time, the gas reaches the second catalytic regenerator 20 because the VOCs exhaust gas concentration is higher than the design value. After the high-temperature catalytic oxidation reaction is carried out through the porous catalyst bed 23 of the second catalytic regenerator, in addition to completely destroying the VOCs in the VOCs-containing exhaust gas, energy higher than the original design value is simultaneously released; thereafter, the high-temperature gas flows again. When the porous regenerator bed 22 of the second catalytic regenerator stores the sensible heat of the high temperature gas in the heat storage material of the porous regenerator bed 22 of the originally cooled second catalytic regenerator, the stored energy will be higher than Original design value. After a certain period of time, the valve is switched, and the volatile organic chemical waste gas 100 to be treated is introduced into the high temperature bed second catalytic regenerator 20 that has stored energy, and the high temperature gas energy is stored in the first catalytic regenerator 10 after the reaction. , complete an operation cycle. At this time, the VOCs exhaust gas is introduced into the second catalytic regenerator 20, and the heat exchange of the gas in the porous regenerator bed 22 of the second catalytic regenerator obtains energy higher than the original design value, and then flows through the porous catalyst bed 23 of the second catalytic regenerator. Partial oxidation is performed, and energy higher than the set value is generated, so that the temperature of the high temperature oxidation chamber 50 is gradually increased. Then, the gas is sent to the first catalytic regenerator 10, and the high temperature catalysis is performed through the porous catalyst bed 13 of the first catalytic regenerator. Oxidation reaction, then releasing more energy than the design value; thereafter, the high temperature gas flows through the first catalytic regenerator 10 to store more energy in the heat storage material of the porous regenerator bed 12 of the first catalytic regenerator; After the VOCs increase in exhaust gas concentration, the operating temperature of the thermal storage regenerative catalytic oxidizer 1 will continue to rise and even lead to runaway.

In order to solve the problem that the temperature of the high-temperature oxidation chamber is over-temperature caused by the instantaneous over-temperature of the VOC exhaust gas to cause the system to jump, U.S. Patent No. 5,837,205 sets an emergency bypass opening to the atmosphere in the high-temperature oxidation reaction chamber 50, and when the system has an over-temperature condition When possible, the emergency bypass opening is automatically opened to directly discharge high-temperature gas. This technology is collectively referred to as “thermal bypass technology”; this technology is purely for equipment safety considerations, and does not consider possible industrial safety problems and pollution. The problem of emissions. This kind of "hot bypass technology" has a constant problem of work safety when it is actually applied in the industry. When the system is operated over-temperature, the high-temperature gas that is instantaneously discharged when the thermal bypass is turned on will often ignite the VOCs, causing serious accidents and accidents.

Taiwan invention patents I 504844 and I 448657, Chinese invention patents ZL 2012 1 0143533.6 and ZL 2012 1 0549700.5 are for high temperature pulse wave reactors (PDR) installed in the high temperature oxidation reaction chamber 50 for VOCs containing more than LEL. The treatment is carried out, and the waste heat recovery boiler is used to recover energy, and the treatment of VOC waste gas having a concentration higher than LEL is safely solved. That is to say, according to the above analysis, for the treatment problem of the VOCs-containing exhaust gas having a high concentration but lower than LEL and a rapid change in concentration and flow rate, the industry has not yet solved a safe and reliable method. The industry's regenerative regenerative catalytic oxidation system (RCO) is often encountered in applications where concentration is likely to change. The predicament of over temperature control.

The high energy recovery efficiency of the regenerative regenerative catalytic oxidation system (RCO) is its advantage, but because the VOCs containing waste gas in petrochemical, chemical and other industries are generally characterized by rapid changes in concentration and rapid changes in flow rate; using conventional thermal storage regeneration Catalytic oxidation systems (RCOs) often suffer from over-temperature runaway, or even accidents that cause over-temperature explosions. If the concentration of VOCs is high, the excess energy cannot effectively discharge the regenerative regenerative catalytic oxidation system (RCO), and the operating temperature of the high temperature oxidation reaction chamber cannot be effectively controlled. The RCO has the risk of temperature loss and the catalyst is burned or ignited. In recent years, there have been many cases of explosion or incineration of regenerative regenerative catalytic oxidation system (RCO) in the world, mainly due to the accidental introduction of high-concentration VOCs into the regenerative regenerative catalytic oxidation system (RCO). In the event of improper conditions, a Deflagration or Detonation phenomenon or an over-temperature operation results in catalyst damage. Therefore, it is one of the purposes of the present invention to improve the existing regenerative regenerative catalytic oxidation system technology and to create a method and equipment for effectively controlling the energy released by the combustion of VOCs.

The main purpose of this creation is to provide a regenerative regenerative catalytic oxidation system that can treat VOCs exhaust gas, which is characterized in that a catalytic regenerator is provided with a cold bypass bypass passage and a valve in the catalytic regenerator, and an ultra-temperature logic is passed through the high-temperature oxidation reaction chamber. The controller controls the opening of the air flow regulating valve, so that part of the VOCs exhaust gas can pass through the cold bypass bypass fast passage of the catalytic regenerator with low heat exchange efficiency, and enter the high temperature oxidation reaction chamber at a lower temperature to suppress the change of the VOCs concentration. Temperature rise problem, maintaining high temperature oxidation reaction chamber can be controlled within a reasonable temperature range, maintaining catalyst activity, completely solving the heat storage regeneration type catalysis Oxidizer (RCO) VOC exhaust gas concentration over-temperature problem of high temperature oxidation reaction chamber over temperature.

A solution to this over-temperature problem can be considered from the characteristics of the conventional heat storage regenerative catalytic oxidation system (RCO) of Figure 1. The heat recovery rate of the regenerative regenerative catalytic oxidation system is generally defined as: R = (T _c -T _o ) / (T _c -T _i ) x 100% (1) where T _c is the high temperature of the regenerative regenerative high temperature oxidation system The maximum temperature or operating temperature of the gas in the oxidation reaction chamber 50 (ie, the highest oxidation temperature), T _o is the regenerative regenerative high temperature oxidation system (ie, regenerative oxidizer), the outlet temperature of the exhaust pipe 144, and T _i is the volatile organic chemical waste gas to be treated. 100 is at the inlet temperature of the ingenating conduit 108 of the catalytic regenerator. If T _c , T _o , and T _i are 400 ° C, 85 ° C, and 50 ° C, respectively, then R = (400 - 85) / (400 - 50) x 100% = 90%. The meaning represented by the above calculation example is heat storage. If the energy recovery efficiency of the regenerative catalytic oxidizer (RCO) itself is designed to be 90%, only the energy is required to increase the temperature of the volatile organic chemical exhaust gas 100 to be treated by 35 ° C (T _o -T _i =85-50 =35 ° C) can oxidize VOCs in the gas. In general, a waste gas containing a volatile organic chemical exhaust gas 100 having a concentration greater than 1,500 mg/m ³ (corresponding to a general VOC of about 500 ppmv) is treated with a regenerative regenerative catalytic oxidation system (RCO), except that the burner 60 is required at startup. In addition to the auxiliary fuel; in normal operation, the organic volatile components in the volatile organic chemical exhaust gas 100 are oxidized to provide sufficient energy for the stable operation of the RCO system, and normal operation requires no use of auxiliary fuel or electric heat. This is the advantage of RCO, but it is also a major disadvantage in the operation of RCO in the petrochemical and chemical industries. Because the catalyst of RCO is sensitive to temperature, if the concentration of VOCs is increased instantaneously, the high temperature oxidation of RCO The temperature of the reaction chamber 50 will rise rapidly; if the concentration of the VOCs exhaust gas rises above the design value for a period of time, the temperature of the high temperature oxidation reaction chamber 50 of the RCO will continue to heat up, and may even lead to runaway.

For example, it is assumed that the design equilibrium concentration of the heat storage regenerative catalytic oxidizer 1 is Co, that is, when the concentration of the VOCs exhaust gas is Co, the thermal storage regenerative catalytic oxidizer 1 can be stably operated at the temperature Tc without the auxiliary fuel. When the concentration of the volatile organic chemical exhaust gas 100 is lower than Co, the high temperature oxidation reaction chamber 50 needs to be fueled via the burner 60 to maintain the operating temperature. When the concentration of the volatile organic chemical exhaust gas 100 is higher than Co, the operating temperature of the high temperature oxidation reaction chamber 50 will gradually increase. Using this design, some of the volatile organic chemical exhaust gas flows into the high temperature oxidation via a cold bypass fast path (eg, the first catalytic regenerator cold bypass fast channel 125 or the second catalytic regenerator cold bypass fast channel 127) The reaction chamber 50 is assumed to have an α volume ratio ( α <1) of the total flow rate of the volatile organic chemical exhaust gas 100, and the cold bypass passage uses a heat storage material having a low heat storage capacity or a low specific heat, so that the cold storage passage is cooled. The gas energy recovery ratio of the bypass fast channel is β times ( β <1) of the normal regenerator bed, that is, the gas temperature rise Δ T _s through the cold bypass fast path is the temperature of the gas passing through the normal regenerator bed is Δ T _i β fold (β <1), i.e., _{△ T s = β △ T i} ; α is the ratio of volatile organic exhaust gas 100 flowing through the cooling passage and the bypass fast-containing gas concentration ratio of the VOCs and design of the concentration equilibrium C / Co, high temperature oxidation reaction chamber operating temperature Tc 50 normal relationship regenerator bed through the gas heating ratio △ T _i, the energy recovery and the ratio β can be expressed as:

For example, if the Tc, To, and Ti of the heat storage regenerative catalytic oxidizer (RCO) are 400 ° C, 85 ° C, and 50 ° C, respectively, the energy recovery efficiency of itself is R = (Tc - To) / (Tc according to the equation (1). -Ti) x 100% = (400-85) / (400-50) X 100% = 90%. Assuming that the design of the cold bypass fast track results in an energy recovery efficiency of only 20%, then ; △ T _i = 85-50 = 35 ° C; also assume that the concentration of volatile organic chemical exhaust gas 100 is pre-designed to allow a maximum increase of 100%, C / C0 = 2; then according to equation (2) can be estimated design cold When bypassing the fast track, the gas flow ratio α considered is as follows: That is, as long as the 12.33% flow rate cold bypass fast channel is prepared, the operation of the control system can be effectively adjusted, so that the operating temperature of the high temperature oxidation reaction chamber 50 can be effectively controlled while the VOCs exhaust gas concentration changes. Set the operating temperature. Therefore, by using the design scheme of adding a VOCs exhaust gas cold bypass rapid passage in the regenerator interior, the regenerative regenerative catalytic oxidizer can be effectively controlled by the concentration change of the VOCs exhaust gas, and the regenerative regenerative catalytic oxidizer can be further improved. Operational safety.

The figure number symbols are as follows:

1‧‧‧ Thermal storage regenerative catalytic oxidizer

10‧‧‧First catalytic regenerator

11‧‧‧Inlet chamber of the first catalytic regenerator

12‧‧‧Porous heat storage bed of the first catalytic regenerator

13‧‧‧Porous catalytic bed of the first catalytic regenerator

20‧‧‧Second catalytic regenerator

21‧‧‧Inlet chamber of the second catalytic regenerator

22‧‧‧Porous heat storage bed of the second catalytic regenerator

23‧‧‧Porous catalytic bed of the second catalytic regenerator

30‧‧‧The third catalytic regenerator

31‧‧‧Inlet chamber of the third catalytic regenerator

32‧‧‧Porous accumulator bed for the third catalytic regenerator

33‧‧‧Porous catalytic bed of the third catalytic regenerator

50‧‧‧High temperature oxidation reaction chamber

60‧‧‧burner

70‧‧‧burner

80‧‧‧Exhaust chimney

100‧‧‧Volatile organic chemical waste gas

101‧‧‧Volatile organic chemical exhaust gas inlet pipe

102‧‧‧Three-way bypass valve

103‧‧‧Volatile organic chemical waste bypass pipe

104‧‧‧ Flame Barrier

106‧‧‧Air valve

107‧‧‧ bypass air duct

108‧‧‧ Catalytic regenerator inlet duct

110‧‧‧First catalytic regenerator inlet valve

111‧‧‧First catalytic regenerator inlet duct

112‧‧‧Second catalytic regenerator inlet valve

113‧‧‧Second catalytic regenerator inlet duct

114‧‧‧Three catalytic regenerator inlet valve

115‧‧‧Three catalytic regenerator inlet duct

124‧‧‧First catalytic regenerator cold bypass fast-path flow regulating valve

125‧‧‧First catalytic regenerator cold bypass fast channel

126‧‧‧Second catalytic regenerator cold bypass fast channel flow control valve

127‧‧‧Second catalytic regenerator cold bypass fast channel

128‧‧‧Third Catalytic Regenerator Cold Bypass Fast Track Flow Regulator

129‧‧‧The third catalytic regenerator cold bypass fast channel

130‧‧‧First catalytic regenerator exhaust valve

131‧‧‧First catalytic regenerator exhaust duct

132‧‧‧Second catalytic regenerator exhaust valve

133‧‧‧Second catalytic regenerator exhaust duct

134‧‧‧Three catalytic regenerator exhaust valve

135‧‧‧Three catalytic regenerator exhaust duct

144‧‧‧Exhaust pipe

145‧‧‧Inducing exhaust fan

147‧‧‧ tail exhaust pipe

150‧‧‧Volatile Organic Chemical Waste Bypass

160‧‧‧First catalytic regenerator backwash valve

161‧‧‧First catalytic regenerator backwashing pipeline

162‧‧‧Second catalytic regenerator backwash valve

163‧‧‧Second catalytic regenerator backwashing pipeline

164‧‧‧The third catalytic regenerator backwash valve

165‧‧‧The third catalytic regenerator backwashing pipeline

166‧‧‧Backwashing windmill

167‧‧‧Backwashing pipeline

200‧‧‧Auxiliary fuel

201‧‧‧Auxiliary fuel supply pipeline

202‧‧‧Auxiliary fuel flow control valve

210‧‧‧ Air

211‧‧‧Air pipeline

212‧‧‧Air flow control valve

300‧‧‧Combustion safety controller

301‧‧‧Temperature Sensing Transmitter

320‧‧‧High temperature oxidation chamber over temperature logic controller

321‧‧‧High temperature oxidation chamber over temperature controller

In order to better understand the present invention, the following illustrations are taken as an example of a preferred embodiment of the present invention.

Figure 1: Traditional thermal storage regenerative catalytic oxidation system

Figure 2: Example of the two-slot regenerative catalytic oxidation system of the present invention

Figure 3: Example of a three-slot regenerative catalytic oxidation system of the present invention

Figure 4: Relationship between flow area ratio ( α ) of fast channel and concentration change ratio (C/Co)

Figure 5: Relationship between flow area ratio ( α ) of fast channel and concentration change ratio (C/Co)

In order to achieve the above effects, the present invention provides a thermal storage regenerative catalytic oxidizer 1 capable of treating VOC exhaust gas, wherein at least two catalytic regenerators, a high temperature oxidation reaction chamber and a high temperature oxidation reaction chamber over temperature logic controller are provided. a porous regenerator bed in which a porous material is accumulated in a catalytic regenerator, a porous catalyst bed on the porous regenerator bed, a high temperature oxidation reaction chamber located above the catalytic regenerator and combined with the catalytic regenerator, and in the porous regenerator bed Some porous materials use a material with large porosity and low heat capacity to form a cold bypass fast channel inside the catalytic regenerator, and a cold flow bypass in the catalytic regenerator is provided with a temperature-controlled flow regulating valve and a high-temperature oxidation reaction chamber. The temperature logic controller; the VOC-containing exhaust gas is introduced into the regenerative regenerative catalytic oxidizer, and is subjected to preheating and high-temperature catalytic oxidation treatment; when the VOC exhaust gas concentration exceeds the limit, the temperature is automatically controlled by the high temperature oxidation reaction chamber over temperature logic controller. Catalytic regenerator cold bypass fast channel flow regulating valve guiding part of VOC exhaust gas via catalytic storage The hot chamber cold bypass fast path, with lower heat recovery efficiency, maintains a lower temperature state and enters the high temperature oxidation reaction chamber, and regulates the operating temperature of the high temperature oxidation reaction chamber to avoid an over temperature accident in the system.

As a first embodiment of the present creation, please refer to [Fig. 2]. The first embodiment of the present invention includes: a thermal storage regenerative catalytic oxidizer 1 (RCO) having at least two catalytic regenerators (first catalytic regenerator 10, second catalytic regenerator 20) and two groups. a cold bypass bypass passage of the catalytic regenerator located inside the catalytic regenerator (first catalytic regenerator cold bypass fast passage 125, second catalytic regenerator cold bypass fast passage 127), two sets of intake control devices (first catalytic The regenerator inlet valve 110, the second catalytic regenerator inlet valve 112), the two sets of outlet control devices (the first catalytic regenerator exhaust valve 130, the second catalytic regenerator exhaust valve 132), at least one set of heating devices (combustion machine 60, auxiliary fuel supply line 201, auxiliary fuel flow regulating valve 202, air flow regulating valve 212) and temperature control device of high temperature oxidation reaction chamber 50 (combustion safety controller 300, temperature sensing transmitter 301), catalysis The porous regenerator bed of the regenerator is filled with a stone or ceramic heat storage material and a catalyst. When the heat storage regeneration type catalytic oxidizer 1 is started, the three-way bypass valve 102 is first closed, and the volatile organic chemical waste gas 100 is led to the volatile organic chemical waste gas bypass discharge port 150 through the volatile organic chemical waste gas bypass pipe 103; The valve 106 sends the air 210 in the air line 211 to the regenerative regenerative catalytic oxidizer 1 through the catalytic regenerator inlet duct 108, activates the combustor 60, and utilizes the temperature sensing transmitter 301 signal, and the combustion safety controller 300 The control air flow regulating valve 212 and the auxiliary fuel flow regulating valve 202 are adjusted to send the auxiliary fuel 200 to the combustor 30 via the auxiliary fuel supply line 201 for combustion temperature rise; first, the high temperature oxidation reaction chamber 50 is heated to the operating temperature (Tc). The three-way bypass valve 102 is restarted to introduce the volatile organic chemical exhaust gas 100 into the system. The volatile organic chemical exhaust gas 100 to be treated is controlled by a three-way bypass valve 102 via a volatile organic chemical exhaust gas inlet pipe 102, and under normal operation, after being properly protected by the flame resistor 104, the catalytic regenerator The air inlet duct 108 first opens the first catalytic regenerator inlet valve 110, closes the first catalytic regenerator exhaust valve 130, and closes the second catalytic regenerator inlet valve 112 and opens the second catalytic regenerator exhaust valve 132. The VOCs exhaust gas is introduced into the first catalytic regenerator 10 through the first catalytic regenerator inlet pipe 111, and the gas first enters the inlet chamber 11 of the first catalytic regenerator, and is uniformly fed into the porous regenerator bed 12 of the first catalytic regenerator. After being heated to a certain temperature, it is partially oxidized by flowing through the porous catalyst bed 13 of the first catalytic regenerator, and then adjusted to the optimum catalytic reaction temperature through the high temperature oxidation chamber 50, and then sent to the second catalytic regenerator 20, The porous catalyst bed 23 of the second catalytic regenerator undergoes a high temperature catalytic oxidation reaction to completely destroy the VOCs in the VOCs-containing exhaust gas; thereafter, the high temperature gas flows through the porous regenerator bed 22 of the second catalytic regenerator The sensible heat of the high temperature gas is stored in the heat storage material of the porous heat storage bed 22 of the second cooled catalytic regenerator; the heat exchanged gas is mixed with the gas inlet chamber 21 of the second catalytic regenerator, and is lower. The temperature flows through the second catalytic regenerator exhaust duct 133 from the second catalytic regenerator exhaust valve 132 to the exhaust duct 144, is drawn by the induced exhaust fan 145, and exhausted through the exhaust exhaust duct 147 to the exhaust stack 80. In this process, for example, it is assumed that the design equilibrium concentration of the regenerative regenerative catalytic oxidizer 1 is Co=1500 ppm, that is, when the concentration of the VOCs exhaust gas is Co=1500 ppm, the regenerative regenerative catalytic oxidizer 1 can be stably operated at the temperature Tc= No auxiliary fuel is required at 400 °C. When the concentration of the volatile organic chemical exhaust gas 100 is 500 to 1500 ppm (less than Co = 1500 ppm), the high temperature oxidation reaction chamber 50 needs to be fueled via the burner 60 to maintain the operating temperature. For example, when the concentration of the volatile organic chemical exhaust gas 100 reaches 3000 ppm (higher than Co = 1500 ppm), the operating temperature of the high temperature oxidation reaction chamber 50 will cause the high temperature oxidation reaction chamber because the concentration of the volatile organic chemical exhaust gas 100 exceeds the design value. The temperature of 50 is increasing. With the design of the present invention, when the system temperature exceeds the set value, the high temperature oxidation reaction chamber over temperature logic controller 320 will start to activate the first catalytic regenerator cold bypass fast channel flow regulating valve 124 to allow part of the volatile organic chemical exhaust gas. Through the first catalytic regenerator cold bypass fast channel 125 flowing into the high temperature oxidation reaction chamber 50, the volume ratio α value of the total flow rate of the volatile organic chemical exhaust gas 100 can be estimated by using equation (2). Assume that the cold bypass passage uses a heat storage material with low heat storage capacity or low specific heat, so that the gas energy recovery ratio through the cold bypass fast passage is β times ( β <1, for example, β = 0.25) of the normal regenerator bed, that is, cold gas bypass passage through fast heating through the normal △ T _s is the temperature rise of the heat storage bed gas β △ T _i of times (β <1), i.e., _{△ T s = β △ T i} = 0.25 △ T i; regenerative The Tc, To, and Ti of the regenerative catalytic oxidizer 1 (RCO) are 400 ° C, 85 ° C, and 50 ° C, respectively, and the energy recovery efficiency of the catalyst is 90%. Δ T _i =85-50=35 ° C; then the VOCs exhaust gas ratio α of the volatile organic chemical exhaust gas 100 flowing through the first catalytic regenerator cold bypass fast channel 125 can be estimated by using equation (2): That is, as long as 12.8% of the VOCs exhaust gas flows through the first catalytic regenerator cold bypass fast channel 125, the operating temperature of the system can be effectively adjusted, so that the operating temperature of the high temperature oxidation reaction chamber 50 can be changed when the VOCs exhaust gas concentration changes. The original set operating temperature can still be effectively controlled. In the present example, the first catalytic regenerator cold bypass fast channel 125 provides a lower heat exchange efficiency to the VOCs exhaust gas, so that part of the VOCs exhaust gas can enter the high temperature oxidation reaction chamber 50 at a lower temperature to achieve the regulation and control of the high temperature oxidation reaction. The purpose of the operating temperature of the chamber 50; the combustion heat value released by the volatile organic chemical exhaust gas 100 also releases excess energy through the oxidation reaction of the high temperature oxidation reaction chamber 50 and the porous catalyst bed 23 of the second catalytic regenerator; At this time, the high temperature oxidation reaction chamber over temperature logic controller 320 of the thermal storage regenerative catalytic oxidizer 1 also adjusts and controls the opening degree of the cold bypass bypass passage 127 of the second catalytic regenerator to effectively discharge excess energy. After a certain period of time, the valve is switched, and the volatile organic chemical waste gas 100 to be treated is introduced into the high temperature bed second catalytic regenerator 20 that has stored energy, and the high temperature gas energy is stored in the first catalytic regenerator 10 after the reaction. , complete an operation cycle. The operation method is to close the first catalytic regenerator inlet valve 110, open the first catalytic regenerator exhaust valve 130, and open the second catalytic regenerator inlet valve 112 and close the second catalytic regenerator exhaust valve 132. The VOCs exhaust gas is introduced into the second catalytic regenerator 20 through the second catalytic regenerator inlet duct 113, and the gas first enters the inlet chamber 21 of the second catalytic regenerator, and is uniformly fed into the porous regenerator bed 22 of the second catalytic regenerator to be preheated to After a certain temperature, it is further flowed through the porous catalyst bed 23 of the second catalytic regenerator for partial oxidation, and then passed through the high temperature oxidation reaction chamber over temperature logic controller 320 to adjust and control the second catalytic regenerator cold bypass fast channel 127 and the first A catalytic regenerator cold bypass fast channel 125 is provided to effectively control the high temperature oxidation chamber 50 to operate at an optimum catalytic reaction temperature, and then sent to the first catalytic regenerator 10 for high temperature through the porous catalyst bed 13 of the first catalytic regenerator. The catalytic oxidation reaction completely destroys the VOCs in the VOCs-containing exhaust gas; thereafter, the high-temperature gas flows through the porous regenerator bed 12 of the first catalytic regenerator to store the sensible heat of the high-temperature gas in the original cooled state. The porous heat storage bed 12 of the first catalytic regenerator is in the heat storage material; the heat exchanged gas is mixed with the gas inlet chamber 11 of the first catalytic regenerator, and then passed through the first catalytic regenerator exhaust pipe at a lower temperature. 131, flowing from the first catalytic regenerator exhaust valve 130 to the exhaust duct 144, drawn by the induced exhaust fan 145, and discharged through the exhaust duct 147 to the exhaust stack 80.

As a second embodiment of this creation, please refer to [Fig. 3]. A second embodiment of the present invention includes: a three-tank regenerative regenerative catalytic oxidizer 1 (RCO) having at least three catalytic regenerators therein (first catalytic regenerator 10, second catalytic regenerator) 20. The third catalytic regenerator 30) and the three sets of catalytic regenerator cold bypass fast channels inside the catalytic regenerator (the first catalytic regenerator cold bypass fast channel 125, the second catalytic regenerator cold bypass fast channel 127) a third catalytic regenerator cold bypass fast passage 129), three sets of intake control devices (first catalytic regenerator inlet valve 110, second catalytic storage) The hot chamber inlet valve 112, the third catalytic regenerator inlet valve 114), the three sets of outlet control devices (the first catalytic regenerator exhaust valve 130, the second catalytic regenerator exhaust valve 132, and the third catalytic regenerator chamber row) a gas valve 134), at least one set of heating devices (burner 60, burner 70, auxiliary fuel supply line 201, auxiliary fuel flow regulating valve 202, air flow regulating valve 212) and temperature control device of high temperature oxidation reaction chamber 50 (combustion) The safety controller 300 and the temperature sensing transmitter 301) are filled with a rock or ceramic heat storage material and a catalyst in a porous heat storage bed of the catalytic regenerator. When the three-tank regenerative catalytic converter oxidizer 1 is operated, there is a catalytic regenerator as an inlet chamber, a catalytic regenerator as an outlet chamber, and a catalytic regenerator as a backwash chamber; to avoid the switching of the catalytic regenerator. Short-term pollution situation. As the catalytic regenerator of the backwashing chamber, the backwashing flow rate is about 1/5 to 1/10 of the normal operating flow rate, and the backwashing time is about 20 seconds or more. When the three-tank regenerative catalytic oxidizer 1 is operated, it can be divided into the following three operation combinations, and the corresponding valves are opened and closed according to the timing or the outlet temperature. (1) One-in, three-out and two-backwashing (first catalytic regenerator 10 intake, second catalytic regenerator 20 backwashing, third catalytic regenerator 30 out of gas); (2) three-in, two-out and one-washback (first) a catalytic regenerator 10 backwashing, a second catalytic regenerator 20 out of gas, a third catalytic regenerator 30 intake; and (3) two in one out three backwashing (first catalytic regenerator 10 out of gas, a second catalytic regenerator 20 intake air, third catalytic regenerator 30 backwash).

When the three-tank regenerative catalytic oxidizer 1 is started, the three-way bypass valve 102 is closed, and the volatile organic chemical exhaust gas 100 is led to the volatile organic chemical waste bypass port through the volatile organic chemical waste bypass pipe 103. 150; The air valve 106 is opened, and the air 210 in the air line 211 is sent to the heat storage regeneration type catalytic oxidizer 1 through the catalytic regenerator air inlet pipe 108, and the combustion machine 60 and the combustion machine 70 are started, and the temperature sensing transmitter 301 is used. Signal, the control air flow regulating valve 212 is regulated by the combustion safety controller 300 The auxiliary fuel flow rate adjusting valve 202 sends the auxiliary fuel 200 to the combustor 60 and the combustor 70 via the auxiliary fuel supply line 201 for combustion temperature rise; first, the high temperature oxidation reaction chamber 50 is heated to the operating temperature (Tc). The three-way bypass valve 102 is restarted to introduce the volatile organic chemical exhaust gas 100 into the system. The volatile organic chemical exhaust gas 100 to be treated is controlled by a three-way bypass valve 102 via a volatile organic chemical exhaust gas inlet pipe 102, and under normal operation, after being properly protected by the flame resistor 104, the catalytic regenerator The air inlet pipe 108 is sent to the RCO for processing.

One in three out two backwash

First, the first catalytic regenerator inlet valve 110 is opened, the first catalytic regenerator exhaust valve 130 is closed, the first catalytic regenerator backwash valve 160 is closed, and the second catalytic regenerator inlet valve 112 is closed, and the second catalytic is turned off. The regenerator exhaust valve 132 opens the second catalytic regenerator backwash valve 162, and closes the third catalytic regenerator inlet valve 114, opens the third catalytic regenerator exhaust valve 134, and closes the third catalytic regenerator backwash valve. 164, the VOCs exhaust gas is introduced into the first catalytic regenerator 10 through the first catalytic regenerator inlet pipe 111, and the gas first enters the inlet chamber 11 of the first catalytic regenerator, and is uniformly fed into the porous regenerator bed of the first catalytic regenerator 12 After preheating to a certain temperature, it is partially oxidized by flowing through the porous catalyst bed 13 of the first catalytic regenerator, and then adjusted to the optimum catalytic reaction temperature through the high temperature oxidation chamber 50, and then sent to the third catalytic regenerator 30. The high-temperature catalytic oxidation reaction is carried out through the porous catalyst bed 33 of the third catalytic regenerator to completely destroy the VOCs in the VOCs-containing exhaust gas; thereafter, the high-temperature gas flows through the porous regenerator bed 32 of the third catalytic regenerator to the high-temperature gas. The sensible heat of the body is stored in the heat storage material of the porous regenerator bed 32 of the originally cooled third catalytic regenerator; the heat exchanged gas is mixed with the gas inlet chamber 31 of the third catalytic regenerator to a lower temperature. The third catalytic regenerator exhaust duct 135 flows from the third catalytic regenerator exhaust valve 134 to the exhaust duct 144, is drawn by the induced exhaust fan 145, and is discharged to the exhaust stack 80 through the exhaust duct 147. At the same time, a small amount of clean combustion products will be drawn by the backwashing windmill 166, the second catalytic regenerator 20 will be backwashed, and the gas flows through the second catalytic regenerator backwash valve 162 and the second catalytic regenerator backwashing pipe 163. The backwashing windmill 166 is returned to the catalytic regenerator inlet pipe 108 via the backwashing pipe 167; the second catalytic regenerator 20 is backwashed and cleaned, and then can be used as the next cycle "three in two out and one backwashing" The gas catalyzed regenerator is used. In this process, for example, it is assumed that the design equilibrium concentration of the regenerative regenerative catalytic oxidizer 1 is C _o = 1500 ppm, that is, when the concentration of the VOCs exhaust gas is C _o = 1500 ppm, the regenerative regenerative catalytic oxidizer 1 can be stably operated at the temperature. No auxiliary fuel is required for T _c =400 °C. When the concentration of the volatile organic chemical exhaust gas 100 is 500 to 1500 ppm (less than C _o = 1500 ppm), the high temperature oxidation reaction chamber 50 needs to be fueled by the burner 60 and the burner 70 to maintain the operating temperature. For example, when the concentration of the volatile organic chemical exhaust gas 100 reaches 3000 ppm (higher than C _o = 1500 ppm), the operating temperature of the high temperature oxidation reaction chamber 50 will cause the high temperature oxidation reaction because the concentration of the volatile organic chemical exhaust gas 100 exceeds the design value. The temperature of the chamber 50 is gradually increased. With the design of the present invention, when the system temperature exceeds the set value, the high temperature oxidation reaction chamber over temperature logic controller 320 will start to activate the first catalytic regenerator cold bypass fast channel flow regulating valve 124 to allow part of the volatile organic chemical exhaust gas. Through the first catalytic regenerator cold bypass fast channel 125 flowing into the high temperature oxidation reaction chamber 50, the volume ratio α value of the total flow rate of the volatile organic chemical exhaust gas 100 can be estimated by using equation (2). Assume that the cold bypass passage uses a heat storage material with low heat storage capacity or low specific heat, so that the gas energy recovery ratio through the cold bypass fast passage is β times ( β <1, for example, β = 0.25) of the normal regenerator bed, that is, cold gas bypass passage through fast heating through the normal △ T _s is the temperature rise of the heat storage bed gas β △ T _i of times (β <1), i.e., _{△ T s = β △ T i} = 0.25 △ T i; regenerative The T _c , T _o , and T _{i of the} regenerative catalytic oxidizer 1 (RCO) are 400 ° C, 85 ° C, and 50 ° C, respectively, and the energy recovery efficiency of the self is designed to be 90%. Δ T _i =85-50=35° C; then the VOCs exhaust gas ratio α of the volatile organic chemical exhaust gas 100 flowing through the first catalytic regenerator cold bypass fast channel 125 can be estimated by using equation (2)

That is, as long as 12.8% of the VOCs exhaust gas flows through the first catalytic regenerator cold bypass fast channel 125, the operating temperature of the system can be effectively adjusted, so that the operating temperature of the high temperature oxidation reaction chamber 50 can be changed when the VOCs exhaust gas concentration changes. The original set operating temperature can still be effectively controlled. In the present example, the first catalytic regenerator cold bypass fast channel 125 provides a lower heat exchange efficiency to the VOCs exhaust gas, so that part of the VOCs exhaust gas can enter the high temperature oxidation reaction chamber 50 at a lower temperature to achieve the regulation and control of the high temperature oxidation reaction. The purpose of the operating temperature of the chamber 50; the combustion heat value released by the volatile organic chemical exhaust gas 100 also releases excess energy through the oxidation reaction of the high temperature oxidation reaction chamber 50 and the porous catalyst bed 33 of the third catalytic regenerator; At this time, the high temperature oxidation reaction chamber over temperature logic controller 320 of the thermal storage regenerative catalytic oxidizer 1 also adjusts and controls the opening degree of the third catalytic regenerator cold bypass fast channel 129 to effectively discharge excess energy.

Three in two out one backwash

After a certain period of time, the valve is switched, and the volatile organic chemical waste gas 100 to be treated is introduced into the third catalytic regenerator 30 of the high temperature bed that has stored energy, and the high temperature gas energy is stored in the first catalyst after the reaction. The regenerator 10 completes the operation cycle of "three ins and two outs and one backwashing". The operation method is to close the first catalytic regenerator inlet valve 110, close the first catalytic regenerator exhaust valve 130, open the first catalytic regenerator backwash valve 160, and close the second catalytic regenerator inlet valve 112, open The second catalytic regenerator exhaust valve 132, the second catalytic regenerator backwash valve 162 is closed, the third catalytic regenerator inlet valve 114 is opened, the third catalytic regenerator exhaust valve 134 is closed, and the third catalytic regenerator is closed. The valve 164 is used to introduce the VOCs exhaust gas into the third catalytic regenerator 30 through the third catalytic regenerator inlet duct 115. The gas first enters the inlet chamber 31 of the third catalytic regenerator and is uniformly fed into the third catalytic regenerator. After the bed 32 is preheated to a certain temperature, it is further partially oxidized through the porous catalyst bed 33 of the third catalytic regenerator, and then adjusted and controlled by the high temperature oxidation reaction chamber over temperature logic controller 320 to control the cold bypass of the third catalytic regenerator. The fast channel 129, the second catalytic regenerator cold bypass fast channel 127 and the first catalytic regenerator cold bypass fast channel 125 effectively control the high temperature oxidation chamber 50 to operate at an optimum catalytic reaction temperature, and then to the first The catalytic regenerator 20 performs high-temperature catalytic oxidation reaction through the porous catalyst bed 23 of the second catalytic regenerator to completely destroy the VOCs in the VOCs-containing exhaust gas; thereafter, the high-temperature gas flows through the porous regenerator bed of the second catalytic regenerator The sensible heat of the high temperature gas is stored in the heat storage material of the porous heat storage bed 22 of the second cooled catalytic regenerator; the heat exchanged gas is mixed with the gas inlet chamber 21 of the second catalytic regenerator to The low temperature flows through the second catalytic regenerator exhaust duct 133 from the second catalytic regenerator exhaust valve 132 to the exhaust duct 144, is drawn by the induced exhaust fan 145, and flows through the exhaust duct 147 to the exhaust stack 80. emission. At the same time, a small amount of clean combustion products will be drawn by the backwashing windmill 166, the first catalytic regenerator 10 will be backwashed, and the gas passes through the first catalytic regenerator backwash valve 160, the first catalytic regenerator backwashing pipe 161, and flows through Backwashing the windmill 166, then backwashing the pipeline 167, returning to the catalytic regenerator inlet duct 108; after the first catalytic regenerator 10 is backwashed and cleaned, it can be used as an outlet catalytic regenerator of the next cycle "two in one out and three backwashing". In the present example, the third catalytic regenerator cold bypass fast channel 129 provides a lower heat exchange efficiency to the VOCs exhaust gas, so that part of the VOCs exhaust gas can enter the high temperature oxidation reaction chamber 50 at a lower temperature to achieve the regulation and control of the high temperature oxidation reaction. The purpose of the operating temperature of the chamber 50; the combustion heat value released by the volatile organic chemical exhaust gas 100 also releases excess energy through the oxidation reaction of the high temperature oxidation reaction chamber 50 and the porous catalyst bed 23 of the second catalytic regenerator; At this time, the high temperature oxidation reaction chamber over temperature logic controller 320 of the thermal storage regenerative catalytic oxidizer 1 also adjusts and controls the opening degree of the cold bypass bypass passage 127 of the second catalytic regenerator to effectively discharge excess energy.

Two in one out three backwash

After a certain period of time, the valve is switched, and the volatile organic chemical waste gas 100 to be treated is introduced into the high temperature bed second catalytic regenerator 20 that has stored energy, and the high temperature gas energy is stored in the first catalytic regenerator 10 after the reaction. , complete the "two in one out three backwash" operation cycle. The operation method is to close the first catalytic regenerator inlet valve 110, open the first catalytic regenerator exhaust valve 130, close the first catalytic regenerator backwash valve 160, and open the second catalytic regenerator inlet valve 112, and close. The second catalytic regenerator exhaust valve 132, the second catalytic regenerator backwash valve 162 is closed, the third catalytic regenerator inlet valve 114 is closed, the third catalytic regenerator exhaust valve 134 is closed, and the third catalytic regenerator is opened. The valve 164 is used to introduce the VOCs exhaust gas into the second catalytic regenerator 20 through the second catalytic regenerator inlet duct 113. The gas first enters the inlet chamber 21 of the second catalytic regenerator and is uniformly fed into the second catalytic regenerator. After the bed 22 is preheated to a certain temperature, it flows through the first The porous catalytic bed 23 of the second catalytic regenerator is partially oxidized, and then passed through the high temperature oxidation reaction chamber over temperature logic controller 320 to adjust and control the second catalytic regenerator cold bypass fast channel 127, the first catalytic regenerator cold bypass fast The channel 125 and the third catalytic regenerator cold bypass fast channel 129 effectively control the high temperature oxidation chamber 50 to operate at an optimum catalytic reaction temperature, and then sent to the first catalytic regenerator 10, through the porous catalyst of the first catalytic regenerator The bed 13 undergoes a high-temperature catalytic oxidation reaction to completely destroy the VOCs in the VOCs-containing exhaust gas; thereafter, the high-temperature gas flows through the porous regenerator bed 12 of the first catalytic regenerator to store the sensible heat of the high-temperature gas in the first cooled first catalyst. The heat storage chamber 12 of the regenerator is in the heat storage material; the heat exchanged gas is mixed with the gas inlet chamber 11 of the first catalytic regenerator, and then passed through the first catalytic regenerator exhaust pipe 131 at a lower temperature. The first catalytic regenerator exhaust valve 130 flows to the exhaust duct 144, is drawn by the induced exhaust fan 145, and is discharged to the exhaust stack 80 through the exhaust duct 147. At the same time, a small amount of clean combustion products will be drawn by the backwashing windmill 166, and the third catalytic regenerator 30 will be backwashed, and the gas flows through the third catalytic regenerator backwash valve 164 and the third catalytic regenerator backwashing pipe 165. The backwashing windmill 166 is returned to the catalytic regenerator inlet pipe 108 via the backwashing pipe 167; the third catalytic regenerator 30 is backwashed and cleaned, and then can be used as the next cycle "one in three outs and two backwashing" The gas catalyzed regenerator is used. In the present example, the second catalytic regenerator cold bypass fast channel 127 provides a lower heat exchange efficiency to the VOCs exhaust gas, allowing a portion of the VOCs exhaust gas to enter the high temperature oxidation reaction chamber 50 at a lower temperature to achieve a regulated high temperature oxidation reaction. The purpose of the operating temperature of the chamber 50; the combustion heat value released by the volatile organic chemical exhaust gas 100 also releases excess energy through the oxidation reaction of the high temperature oxidation reaction chamber 50 and the porous catalyst bed 13 of the first catalytic regenerator; Atmospheric temperature logic controller for high temperature oxidation reaction chamber of thermal storage regenerative catalytic oxidizer 1 320, the opening of the cold bypass bypass passage 125 of the first catalytic regenerator is also controlled at the same time, and the excess energy is effectively discharged.

The heat storage regenerative catalytic oxidizer for treating VOC exhaust gas is a cold bypass fast passage and a flow regulating valve integrated through a catalytic heat storage chamber, and is equipped with a high temperature oxidation reaction chamber over temperature logic controller 320, and is programmed by PLC, and The combustion safety controller 300 is combined to control and control the first catalytic regenerator cold bypass fast channel flow regulating valve 124, the second catalytic regenerator cold bypass fast channel flow regulating valve 126, and the third catalytic regenerator cold in the PID control mode. By bypassing the fast-channel flow regulating valve 128, the purpose of stably controlling the operating temperature of the high-temperature oxidation reaction chamber 50 is achieved, so that the regenerative regenerative catalytic oxidizer 1 of the present invention can respond to the needs of industrial VOCs for exhaust gas emission control, and for rapidly changing VOCs. Concentrations and speeds, applications with concentrations above the set point, etc., provide a new and safe control tool.

The above-mentioned drawings and descriptions are only the preferred two-slot and three-slot embodiments of the heat storage regenerative catalytic oxidizer for treating VOCs waste gas, which are familiar to the skilled person and are based on the spirit of the present case. Changes such as modification, equivalent change or increase in the number of heat storage tanks should still be included in the scope of patent application in this case.

Figure 4 and Figure 5 show the ratio of the VOCs flow through the cold bypass fast channel or the flow area ratio ( α ) of the fast channel to the concentration change ratio (C/Co), where β is the cold bypass fast path The ratio of gas energy recovery to gas energy recovery of a normal regenerator bed. Shown by FIG. 4, material and structural design of the cold bypass passage fast decision beta] value, the smaller the value beta] concentration change due to the ability to be the stronger. If the temperature range of the system is to be varied, the flow area ratio ( α ) of the fast channel needs to be increased when the regenerative regenerative catalytic oxidizer 1 is designed. As shown in Fig. 5, when the flow area ratio ( α ) of the fast path is equal to 10%, if the β value is designed to be 0.1, the regenerative regenerative catalytic oxidizer 1 can still increase the VOCs exhaust gas concentration change by 94%. The stable control operating temperature is at the original set value. However, when the beta value is designed to be 0.3, the regenerative regenerative catalytic oxidizer 1 can stably control the operating temperature at the original set value when the VOCs exhaust gas concentration change is increased by 73%. The high temperature oxidation reaction chamber over temperature logic controller 320 with the optimal control programming technology can increase the concentration ratio of the VOCs exhaust gas by 20%, and still enable the heat storage regeneration type catalytic oxidizer 1 to stably control the operating temperature at the original set value temperature high warning Hereinafter, for example, when the flow area ratio ( α ) of the fast channel is equal to 10%, if the β value is designed to be 0.1, the regenerative regeneration type catalytic oxidizer 1 increases the VOCs exhaust gas concentration change by 94% X 1.2=112.8%. For example, the original design VOCs exhaust gas concentration is 1500ppm, the system can still control the operation when the system is operated to 3192ppm. When the β value is designed to be 0.3, the regenerative regenerative catalytic oxidizer 1 can increase the VOCs exhaust gas concentration change by 73% X 1.2=87.6%, for example, the original design VOCs exhaust gas concentration is 1500 ppm, and the system can be stabilized when the system is operated to 2814 ppm. Control the operating temperature at the original set value.

Structural design and materials fast cold bypass passage determines the size of β value, e.g., the greater the porosity ε of the porous material, the greater the effective aperture D _h, and β influence the specific heat C _p value of the material will be smaller, so that the value of β The smaller, according to equation (2), the flow area ratio ( α ) of the fast channel is inversely proportional to (1- β ), and the smaller the β value, the smaller the flow area ratio ( α ) of the fast channel. Typically the choice of materials and design of structural design principle β less than 0.5, less than 0.3 and at the best value β. If a hollow ceramic tube is used as the material of the cold bypass fast path, the β value approaches zero. According to equation (2), the flow area ratio ( α ) of the fast channel is inversely proportional to (1- β ), and the smaller the β value fast flow area ratio of the desired channel ([alpha]) is also smaller, and therefore, the use of hollow ceramic tube, the flow passage area ratio of the desired speed ([alpha]) is minimal; but the use of hollow ceramic tube as the cold bypass passage fast material Material structure design requires special design.

In summary, the regenerative regenerative catalytic oxidizer for treating VOC exhaust gas disclosed in the present invention is unprecedented, and can indeed achieve the improvement of efficacy, and is available for industrial utilization, fully complying with the invention patent requirements, praying The bureau issued a patent to encourage innovation and no sense of morality. However, the drawings and descriptions disclosed above are only preferred embodiments of the present invention, and modifications or equivalent changes made by those skilled in the art in accordance with the spirit of the present invention should still be included in the scope of the patent application.

Claims (9)

A thermal storage regenerative catalytic oxidizer comprising at least two catalytic regenerators and a high temperature oxidation reaction chamber, wherein a porous regenerator bed in which a porous material is deposited in a catalytic regenerator, a porous catalyst bed on the porous regenerator bed, and high temperature oxidation The reaction chamber is located above the catalytic regenerator and combined with the catalytic regenerator, and has a set of gas cold bypass fast channels inside the porous regenerator of each catalytic regenerator, and a set of flow regulating valves at the bottom of the gas cold bypass fast channel. For example, in the regenerative regenerative catalytic oxidizer of claim 1, the flow regulating valve at the bottom of each group of gas cold bypass fast channels can be independently controlled. The regenerative regenerative catalytic oxidizer according to claim 1, wherein the material constituting the gas cold bypass passage is a porous material, and the heat storage capacity is 50% or less of the heat storage capacity of the porous regenerator porous material. The regenerative regenerative catalytic oxidizer of claim 1, wherein the material constituting the gas cold bypass rapid passage is a hollow ceramic tube. For example, the regenerative regenerative catalytic oxidizer of claim 1 is provided with a high temperature oxidation reaction chamber over temperature logic controller, which automatically controls the flow regulating valve of the gas cold bypass fast passage. A gas cold bypass fast passage of a regenerative regenerative catalytic oxidizer is located inside a porous regenerator bed in which a porous material is accumulated in a catalytic regenerator, and a flow regulating valve is arranged at the bottom of the gas cold bypass fast channel. For example, in the gas cold bypass fast passage of the regenerative regenerative catalytic oxidizer of claim 6, the flow regulating valve at the bottom is independently controlled by the over temperature logic controller. The gas cold bypass fast passage of the regenerative regenerative catalytic oxidizer of claim 6 is laid by using a porous material. For example, the gas cold bypass fast passage of the regenerative regenerative catalytic oxidizer of claim 6 is laid by using a hollow ceramic tube.