Energy efficiency calculation method and fault detection method for RTO equipment

Abstract

The present invention discloses an energy efficiency calculation method and a fault detection method for RTO equipment, and belongs to the technical field of combustion waste gas treatment. The method proposes a new energy efficiency calculation method for RTO equipment, which uses key parameters of RTO to perform real-time detection of energy efficiency, and can truly reflect the energy-saving performance of RTO; further, by performing energy efficiency detection on RTO equipment, the change of energy efficiency of RTO equipment can be accurately understood, so as to know whether the operation process of RTO equipment is normal, and timely diagnose and eliminate RTO equipment fault problems.

Description

Technical Field

[0001] The invention relates to an energy efficiency calculation method and a fault detection method for RTO equipment, belonging to the technical field of combustion waste gas treatment. Background Art

[0002] RTO (Regenerative Thermal Oxidizer) equipment is an energy-saving and environmentally friendly device used to treat medium and low concentrations of volatile organic waste gas. It is mainly composed of a combustion chamber, a heat storage chamber and a switching valve. It can oxidize and decompose VOCs waste gas into carbon dioxide and water at a temperature above 760 degrees Celsius. At the same time, the high-temperature waste heat generated by combustion is stored in the heat storage chamber for preheating VOCs waste gas, so as to reduce operating costs and save energy. However, when the concentration of VOCs waste gas is lower than the RTO self-sustaining concentration, a large amount of auxiliary fuel is still required to maintain the combustion chamber treatment temperature. Not only does the operating cost remain high, but it also causes additional carbon emissions. How to reduce operating energy consumption and achieve energy conservation and emission reduction is a key problem that needs to be overcome in the RTO technological innovation.

[0003] In order to reduce operating energy consumption and achieve energy conservation and emission reduction, it is necessary to accurately measure the energy efficiency of RTO equipment. At present, the only indicator related to RTO energy consumption is thermal efficiency η, which is defined in HJ1093-2020 "Technical Specifications for Industrial Organic Waste Gas Treatment by Regenerative Combustion" as the ratio of the actual heat used by preheated exhaust gas to the maximum available heat, and is based on the combustion chamber temperature T and the inlet gas temperature t i and outlet gas temperature t o Calculate, that is:

[0004]

[0005] The following conditions must be met to accurately reflect the energy efficiency of RTO equipment using thermal efficiency: first, the mass flow of exhaust gas inlet and outlet remains unchanged; second, the heat loss of the system is ignored. However, in order to ensure the safety of RTO equipment, a thermal bypass is required according to the specification requirements, so the gas mass flow at the inlet and outlet is different during the operation of RTO. At the same time, due to the neglect of the influence of heat loss, the theoretical calculation result of thermal efficiency is higher than the actual value.

[0006] In addition, some manufacturers will artificially lower the RTO outlet temperature by postponing the temperature detection point or adding back-blowing to cool the purified gas, thereby artificially inflating the measured thermal efficiency.

[0007] In summary, the use of thermal efficiency cannot accurately measure the actual heat utilization efficiency of RTO, and thus truly reflect the energy consumption level of RTO. Summary of the invention

[0008] In order to accurately reflect the energy efficiency of RTO equipment and provide necessary data for reducing operating energy consumption and achieving energy conservation and emission reduction, the present invention provides an energy efficiency calculation method for RTO equipment to overcome the limitations of the current indicator "thermal efficiency" in application, thereby truly reflecting the energy-saving performance of RTO equipment and being able to diagnose and repair the RTO equipment in a timely manner when an abnormality occurs.

[0009] A first object of the present invention is to provide a method for calculating energy efficiency of an RTO device, the method comprising:

[0010] Step S1, measuring the operating parameters of the RTO equipment under normal operating conditions, including the RTO equipment inlet temperature, hot bypass gas volume flow, fuel gas consumption, combustion chamber temperature, exhaust gas inlet concentration, exhaust gas inlet air volume, and exhaust gas outlet air volume;

[0011] Step S2, using the RTO equipment operating parameter values ​​measured in step S1, calculate the energy efficiency of the RTO equipment according to the following formula:

[0012]

[0013] Among them, Q V is the heat released after the solvent in the exhaust gas is burned, Q L The heat provided by gas combustion, Q p The heat removed by the thermal bypass, Q T is the heat of the combustion chamber gas, Q i The heat brought into the inlet gas;

[0014] Optionally, the method calculates the heat Q released after the solvent in the exhaust gas is burned according to the following formula: V , the heat provided by gas combustion Q L , the heat removed by the thermal bypass Q p , the heat Q of the combustion chamber gas T And the heat Q brought by the inlet gas i :

[0015] Q T =ρ a ·F i ·c a ·T

[0016] Q p =ρ a F p c a T=ρ a (F i -F o )c a T

[0017] Q i =ρa ·F i ·c a ·t i

[0018] Q V =H V ·F i ·σ V 10 -6

[0019] Q L =H L ·F L

[0020] Among them, F i ——inlet gas volume flow rate; F o ——Outlet gas volume flow rate; F p ——hot bypass gas volume flow rate; ρ a ——density of air; c a ——Specific heat capacity of air at constant pressure at 0℃; T——Average temperature of combustion chamber; t i ——RTO inlet gas temperature; H V ——Heating value of the solvent in the exhaust gas; σ V ——waste gas concentration; H L ——Natural gas calorific value; F L ——Volume flow rate of natural gas.

[0021] Optionally, inlet gas volume flow F i That is, the measured exhaust gas inlet air volume and outlet gas volume flow F of the RTO equipment o That is, the exhaust gas outlet air volume of the RTO equipment is measured, the average temperature of the combustion chamber T is calculated by measuring the combustion chamber temperature of the RTO equipment, and the temperature of the RTO inlet gas t i Same as the inlet temperature of RTO equipment, exhaust gas concentration σ V The volume flow rate F of natural gas is obtained by measuring the exhaust gas inlet concentration. L Calculated by gas consumption; air density ρ a 、Specific heat capacity of air at constant pressure at 0℃ c a , the calorific value of the solvent in the exhaust gas H V And the calorific value of natural gas H L Available through query.

[0022] Optionally, when measuring the operating parameters of the RTO device, the method adjusts the fan frequency to maintain the inlet exhaust air volume of the RTO device at the measured air volume F i1 , measure the air volume F i1 It is the inlet air volume or outlet air volume minus the make-up air volume.

[0023] Optionally, the measured air volume F i1 ≥RTO equipment design air volume*50%.

[0024] Optionally, when it is necessary to measure the energy efficiency of the RTO device at m different measured air volumes, the fan frequency is adjusted from small to large so that the inlet exhaust air volume of the RTO device is maintained at the corresponding measured air volume F ij (j=2,3,…,m), measure the air volume F ij It is the inlet air volume or outlet air volume minus the make-up air volume.

[0025] Optionally, the RTO device includes a fan, a heat storage chamber and a combustion chamber; the combustion chamber is installed above the heat storage chamber; the outlet of the fan is connected to one end of the pipe, the other end of the pipe is connected to the exhaust pipe, and the pipe is connected to the bottom of the heat storage chamber and the capture chamber in turn; the RTO device also includes a high-temperature thermal bypass pipeline, one end of the high-temperature thermal bypass pipeline is connected to the combustion chamber, and the other end of the high-temperature thermal bypass pipeline is connected between the capture chamber and the exhaust pipe on the pipeline.

[0026] Optionally, the RTO equipment is provided with two heat storage chambers, namely heat storage chamber I and heat storage chamber II; during operation, under the action of the fan, the exhaust gas to be treated flows into the heat storage chamber through a pipeline, and a lifting valve is arranged on the pipeline, and the lifting valve is used to change the gas flow direction so that the gas can flow into different heat storage chambers alternately; ceramic heat storage bodies are arranged in both heat storage chambers; the gas enters the combustion chamber after being heated by the ceramic heat storage body of heat storage chamber I, and the gas passes through the ceramic heat storage body of heat storage chamber II after combustion, and the heat brought out by the gas is transferred to the ceramic heat storage body of heat storage chamber II, so that the temperature of heat storage chamber II rises; the gas flows into the pipeline and passes through the capture chamber, and then enters the exhaust pipe and is discharged; after a predetermined period of time, the exhaust gas passes through the heat storage chamber II through the lifting valve, and then enters the heat storage chamber I after combustion, so as to realize the reuse of the high-temperature waste heat generated by the combustion.

[0027] The present invention also provides an RTO equipment fault detection method, which adopts the above method to calculate the energy efficiency value of the RTO equipment under different air volumes as a reference value. When it is detected that the difference between the energy efficiency value of the RTO equipment under the corresponding air volume and the reference value exceeds a set threshold, it is determined that the RTO equipment has a fault.

[0028] The beneficial effects of the present invention are:

[0029] By proposing a new energy efficiency calculation method for RTO equipment and using the key parameters of RTO to perform real-time energy efficiency detection, the energy-saving performance of RTO can be truly reflected; further, by performing energy efficiency detection on RTO equipment, the changes in the energy efficiency of RTO equipment can be accurately understood, thereby knowing whether the operation process of RTO equipment is normal, and timely diagnosis and elimination of RTO equipment faults. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0031] Figure 1 A schematic diagram of the structure of an RTO device according to an embodiment of the present invention is shown.

[0032] Figure 2 A simplified diagram of the RTO structure is shown.

[0033] Figure 3 The energy efficiency of the RTO device obtained by the energy efficiency calculation method provided by the present application without considering heat bypass in one embodiment of the present invention and the thermal efficiency calculated by temperature using the existing method change with the sampling time curve.

[0034] Figure 4 The energy efficiency of the RTO device obtained by the energy efficiency calculation method provided by the present application under the premise of considering heat bypass in one embodiment of the present invention and the thermal efficiency calculated by temperature using the existing method change with the sampling time curve.

[0035] Markings in the attached drawing: 1. fan; 2. heat storage chamber; 21. heat storage chamber bracket; 3. combustion chamber; 4. lifting valve; 5. exhaust pipe; 6. capture chamber; 7. high-temperature thermal bypass pipeline. DETAILED DESCRIPTION

[0036] In order to make the objectives, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0037] First, the RTO equipment is introduced as follows:

[0038] like Figure 1 As shown, the RTO device includes a fan 1, a heat storage chamber 2 and a combustion chamber 3. The heat storage chamber 2 is fixed by a heat storage chamber bracket 21. The combustion chamber 3 is installed above the heat storage chamber 2. The outlet of the fan 1 is connected to one end of the pipeline, and the other end of the pipeline is connected to the exhaust pipe 5. The pipeline is connected to the bottom of the heat storage chamber 2 and the capture chamber 6 in sequence. The RTO device also includes a high-temperature heat bypass pipeline 7. One end of the high-temperature heat bypass pipeline 7 is connected to the combustion chamber 3. The other end of the high-temperature heat bypass pipeline 7 is connected between the capture chamber 6 and the exhaust pipe 5 on the pipeline.

[0039] like Figure 2As shown, there are two regenerators, namely, regenerator I and regenerator II. During operation, under the action of the fan 1, the waste gas to be treated flows into the regenerator 2 through the pipeline. A lifting valve 4 is arranged on the pipeline, and the lifting valve 4 is used to change the gas flow direction so that the gas can flow into different regenerators 2 alternately. Ceramic regenerators are arranged in both regenerators 2. The gas enters the combustion chamber 3 after being heated by the ceramic regenerator of the regenerator 2 (regenerator I) on one side. After the gas is burned, it passes through the ceramic regenerator of the regenerator 2 (regenerator II) on the other side. The heat brought by the gas is transferred to the ceramic regenerator, so that the temperature of the regenerator rises. After the gas flows into the pipeline and passes through the capture chamber 6, it enters the exhaust pipe 5 and is discharged; after a period of time, the waste gas passes through the regenerator II through the lifting valve 4, and then enters the regenerator I after combustion, so as to realize the reuse of the high-temperature waste heat generated by the combustion.

[0040] Embodiment 1:

[0041] This embodiment provides an energy efficiency calculation method for an RTO device, which is described in detail as follows:

[0042] according to Figure 2 The RTO structure diagram shown in the figure can be obtained according to the law of conservation of energy:

[0043] Q T =Q i +Q M +Q V +Q L =Q p +Q M +Q o +Q r (2)

[0044] in,

[0045] Q T ——The heat content of the combustion chamber gas, in kJ;

[0046] Q i ——The heat brought into the inlet gas, in kJ;

[0047] Q M ——The amount of heat absorbed or released by the heat storage body, in kJ;

[0048] Q V ——The heat released after the combustion of the solvent in the exhaust gas, in kJ;

[0049] Q L ——The heat provided by gas combustion, in kJ;

[0050] Q p ——The amount of heat removed by the thermal bypass, in kJ;

[0051] Q o ——The heat carried away by the outlet gas, in kJ;

[0052] Q r ——System heat loss, in kJ.

[0053] The maximum heat that can be utilized in the RTO system is Q max =Q T -Q i , and the heat actually utilized is the heat Q stored in the heat storage chamber M and the heat removed from the thermal bypass Q p , so the energy efficiency of RTO can be expressed as:

[0054]

[0055] From formula (2), we can get:

[0056] Q M =Q T -Q i -Q V -Q L (4)

[0057] Substituting equation (4) into equation (3), the energy efficiency of RTO can be expressed as Q V and Q L calculate:

[0058]

[0059] The relevant heat is calculated by the following formula:

[0060] Q T =ρ a ·F i ·c a ·T (6)

[0061] Q p =ρ a F p c a T=ρ a (F i -F o )c a T (7)

[0062] Q i =ρ a ·F i ·c a ·t i (8)

[0063] Q V =H V ·F i ·σV 10 -6 (9)

[0064] Q L =H L ·F L (10)

[0065] Where:

[0066] F i ——Inlet gas volume flow rate, in Nm 3 / h;

[0067] F o ——Outlet gas volume flow rate, in Nm 3 / h;

[0068] F p ——Volume flow rate of hot bypass gas, in Nm 3 / h;

[0069] ρ a ——The density of air is taken as 1.293kg / m 3 ;

[0070] c a ——The constant pressure specific heat capacity of air at 0℃ is taken as 1.004kJ / (kg·℃);

[0071] T——Average temperature of the combustion chamber, in °C;

[0072] t i ——RTO inlet gas temperature, in °C;

[0073] H V ——The calorific value of the solvent in the exhaust gas, in kJ / kg;

[0074] σ V ——Exhaust gas concentration, in mg / Nm 3 ;

[0075] H L ——Natural gas calorific value, taken as 34000kJ / Nm 3 ;

[0076] F L ——Volume flow rate of natural gas, in Nm 3 / h.

[0077] According to formula (5), the energy efficiency value of RTO is related to the heat Q released after the solvent in the exhaust gas is burned. V , the heat provided by gas combustion Q L , the heat removed by the thermal bypass Q p , the heat Q of the combustion chamber gasT And the heat Q brought by the inlet gas i Relatedly, the energy efficiency determination method provided in this application comprises the following steps:

[0078] Step 1: The RTO equipment is turned on for preheating to allow the combustion chamber to reach the set temperature;

[0079] Step 2: According to the exhaust gas volume of the RTO equipment environment, adjust the fan frequency to keep the inlet exhaust gas volume of the RTO equipment at the measured volume F. i1 ;Measure air volume F i1 It is the inlet air volume or outlet air volume minus the make-up air volume;

[0080] Step 3, keeping the fan frequency constant, measuring the RTO equipment operating parameters n times with a sampling period τ; the RTO equipment operating parameters include RTO equipment inlet temperature, RTO equipment outlet temperature, gas consumption, combustion chamber temperature, exhaust gas inlet concentration, exhaust gas inlet air volume, and exhaust gas outlet air volume;

[0081] Step 4: Using the recorded measurement data, calculate the energy efficiency under different measured air volumes according to formula (5).

[0082] If energy efficiency testing is required at m different measured air volumes, the fan frequency should be adjusted from small to large to maintain the inlet exhaust air volume of the RTO equipment at the corresponding measured air volume F. ij (j=2,3,…,m); measure air volume F ij = The inlet air volume or outlet air volume minus the supplementary air volume; repeat the above step 3 for m-1 rounds to complete the energy efficiency test under all the air volumes to be measured, and confirm the recorded data; m is recommended to be 1 to 4, that is, to perform energy efficiency tests under 1 to 4 different measured air volumes, and measure the air volume F im ≤RTO equipment design air volume, and each measured air volume is distributed as evenly as possible.

[0083] Using the recorded measurement data, the energy efficiency under different measured air volumes is calculated according to formula (5).

[0084] A further technical solution is that in step 2, the air volume F is measured i1 ≥RTO equipment design air volume*50%.

[0085] A further technical solution is that in step 2, the measurement time is (n-1)×τ≥1 hour, and the average wind volume value is taken.

[0086] In step 2, the air volume F measured by the RTO device can be adjusted by adjusting the inlet pressure of the RTO device or the main fan frequency of the RTO device.

[0087] When measuring the operating parameters of the RTO equipment, the specific measurement methods are as follows:

[0088] (1) The RTO equipment is equipped with a separate natural gas meter, which can obtain the gas consumption of the RTO equipment and record the gas consumption of the RTO equipment at intervals τ;

[0089] (2) When the RTO equipment is operating independently and does not process exhaust gas, the high-temperature thermal bypass pipeline 7 can be closed;

[0090] (3) The inlet of fan 1 is connected to the RTO inlet pipe, and the RTO inlet pipe has a measuring hole located in the straight pipe section for measuring air volume and temperature;

[0091] (4) The exhaust pipe 5 of the RTO equipment has a hole for inserting a thermocouple measuring port, which is used to install a thermocouple to measure the temperature at the exhaust pipe 5 position;

[0092] (5) The exhaust pipe 5 of the RTO equipment has an installation pipe so that the anemometer can measure at the location of the exhaust pipe;

[0093] (6) A temperature measuring hole is formed in the combustion chamber 3 of the RTO equipment. A thermocouple is inserted into the temperature measuring hole to measure the temperature in the combustion chamber 3. The thermocouple is connected to a recorder;

[0094] (7) The exhaust gas is connected to the inlet of the fan 1 through the inlet exhaust gas duct, and the concentration of the exhaust gas in the inlet exhaust gas duct is measured using the FID device;

[0095] (8) A duct anemometer is used to measure the air volume of the exhaust gas in the inlet exhaust gas duct, and a thermocouple is used to measure the temperature of the exhaust gas in the inlet exhaust gas duct.

[0096] Embodiment 2:

[0097] This embodiment provides corresponding energy efficiency calculation methods for the cases of RTO equipment without heat bypass and with heat bypass. In this embodiment, the exhaust gas concentration at the RTO inlet is not high enough to achieve self-sustaining, and natural gas needs to be introduced to maintain the combustion chamber processing temperature so that the exhaust gas concentration at the outlet meets the emission standards.

[0098] First, perform energy efficiency calculation:

[0099]

[0100] Then the relevant parameters of the RTO equipment are tested. The measurement process is as follows:

[0101] Step 1: First, turn on the RTO equipment, make the combustion chamber reach the set temperature, and maintain the initial air volume at F. a ;

[0102] Step 2: After the RTO equipment runs smoothly, VOCs exhaust gas is introduced into the RTO equipment to keep the fan frequency running stably. The measured RTO inlet air volume is 19126m3 / h. The RTO equipment operating parameters are recorded at a sampling frequency of once every 10 minutes, as shown in Table 1;

[0103] Step 3: Confirm the data and the measurement is completed.

[0104] A further technical solution is that the main components of the RTO inlet exhaust gas are ethanol (calorific value: 29713 kJ / kg), isopropanol (calorific value: 33078 kJ / kg) and dimethylamine (calorific value: 38707 kJ / kg), and their mass ratio is 0.4:0.5:0.1, so the calorific value H of the solvent in the exhaust gas is V for:

[0105] 29713×0.4+33078×0.5+38707×0.1=32295kJ / kg

[0106] According to the energy efficiency calculation formula (11), the energy efficiency shown in Table 1 can be obtained: Table 1 shows the thermal efficiency and energy efficiency measurement results.

[0107] Table 1 Thermal efficiency and energy efficiency measurement results

[0108]

[0109] According to the data in Table 1 and Figure 3 From the change curve, we can know that the energy efficiency of the RTO equipment fluctuates within a certain range. The difference between energy efficiency and thermal efficiency is small. This is because in this embodiment, the RTO equipment has no heat bypass and backwash, and the system heat loss Q r Therefore, the thermal efficiency calculated by temperature is very close to the energy efficiency calculated by the method of the present application.

[0110] Considering the case where the RTO equipment has thermal bypass, in order to avoid the interference of exhaust gas composition fluctuations on the energy efficiency measurement results, air is introduced at the inlet of the RTO equipment during the test, that is, there is no VOCs exhaust gas.

[0111] First, perform energy efficiency calculation:

[0112] The maximum heat that can be utilized in the RTO system is Q max =Q T -Q i , and the heat actually utilized is the heat Q stored in the heat storage chamber M and the heat removed from the thermal bypass Q p , so the energy efficiency of RTO can be expressed as:

[0113]

[0114] Because in this example, Q V =0, from formula (4) we can get:

[0115] Q M =Q T -Q i -Q L (12)

[0116] Substituting formula (12) into formula (3) yields the energy efficiency calculation formula for RTO:

[0117]

[0118] Then the RTO parameter detection is carried out, and the measurement process is as follows:

[0119] Step 1: First, when the production line is running normally, turn on the RTO equipment, make it run to the set temperature, and maintain the initial air volume at F a ;

[0120] Step 2: Supply air to the RTO equipment, keep the fan frequency stable, and record the operating parameters of the RTO equipment at a sampling frequency of once every 10 minutes as shown in Table 2;

[0121] Step 3: Confirm the data and the measurement is completed.

[0122] The data in Table 2 were obtained by the energy efficiency calculation method and detection of the RTO equipment of the present invention.

[0123] Table 2 Temperature efficiency and energy efficiency measurement results

[0124]

[0125] According to the data in Table 2 and Figure 4 From the change curve, we can know that the energy efficiency of RTO equipment fluctuates within a certain range. However, the energy efficiency calculated by the method of this application is quite different from the thermal efficiency currently calculated by temperature. This is because the thermal efficiency currently calculated by temperature does not take into account the heat loss of thermal bypass, resulting in a higher calculated result.

[0126] By measuring the energy efficiency of RTO equipment, we can accurately understand the changes in the energy efficiency of RTO equipment, and can obtain various data during the operation of RTO equipment, so as to discover the performance problems of RTO equipment in advance and realize early optimization and maintenance.

[0127] Some steps in the embodiments of the present invention may be implemented using software, and the corresponding software program may be stored in a readable storage medium, such as a CD or a hard disk.

[0128] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for calculating energy efficiency of RTO equipment, characterized in that: The method comprises: Step S1, measuring the operating parameters of the RTO equipment under normal operating conditions, including the RTO equipment inlet temperature, hot bypass gas volume flow, fuel gas consumption, combustion chamber temperature, exhaust gas inlet concentration, exhaust gas inlet air volume, and exhaust gas outlet air volume; Step S2, using the RTO equipment operating parameter values ​​measured in step S1, calculate the energy efficiency of the RTO equipment according to the following formula: Among them, Q V is the heat released after the solvent in the exhaust gas is burned, Q L The heat provided by gas combustion, Q p The heat removed by the thermal bypass, Q T is the heat of the combustion chamber gas, Q i The heat brought into the inlet gas; The RTO device includes a fan, a heat storage chamber and a combustion chamber; the combustion chamber is installed above the heat storage chamber; the outlet of the fan is connected to one end of the pipeline, the other end of the pipeline is connected to the exhaust pipe, and the pipeline is connected to the bottom of the heat storage chamber and the capture chamber in turn; the RTO device also includes a high-temperature thermal bypass pipeline, one end of the high-temperature thermal bypass pipeline is connected to the combustion chamber, and the other end of the high-temperature thermal bypass pipeline is connected between the capture chamber and the exhaust pipe on the pipeline; The RTO equipment is provided with two heat storage chambers, namely, heat storage chamber I and heat storage chamber II. During operation, under the action of the fan, the waste gas to be treated flows into the heat storage chamber through a pipeline, and a lifting valve is provided on the pipeline. The lifting valve is used to change the flow direction of the gas so that the gas can flow into different heat storage chambers alternately. Ceramic heat storage bodies are provided in both heat storage chambers. The gas enters the combustion chamber after being heated by the ceramic heat storage body of heat storage chamber I. After the gas is burned, it passes through the ceramic heat storage body of heat storage chamber II, and the heat brought by the gas is transferred to the ceramic heat storage body of heat storage chamber II, so that the temperature of heat storage chamber II rises. After the gas flows into the pipeline and passes through the capture chamber, the gas enters the exhaust pipe and is discharged. After a predetermined period of time, the waste gas passes through the heat storage chamber II through the lifting valve, and then enters the heat storage chamber I after combustion, so as to realize the reuse of the high-temperature waste heat generated by the combustion.

2. The method according to claim 1, characterized in that The method calculates the heat Q released after the solvent in the exhaust gas is burned according to the following formula: V , the heat provided by gas combustion Q L , the heat removed by the thermal bypass Q p , the heat Q of the combustion chamber gas T And the heat Q brought by the inlet gas i : Q T =ρ a ·F i ·c a ·T Q p =ρ a F p c a T=ρ a (F i -F o )c a T Q i =ρ a ·F i ·c a ·t i Q V =H V ·F i ·σ V ·10 -6 Q L =H L ·F L Among them, F i ——inlet gas volume flow rate; F o ——Outlet gas volume flow rate; F p ——hot bypass gas volume flow rate; ρ a ——density of air; c a ——Specific heat capacity of air at constant pressure at 0℃; T——Average temperature of combustion chamber; t i ——RTO inlet gas temperature; H V ——Heating value of the solvent in the exhaust gas; σ V ——waste gas concentration; H L ——Natural gas calorific value; F L ——Volume flow rate of natural gas.

3. The method according to claim 2, characterized in that When measuring the operating parameters of the RTO equipment, the method adjusts the fan frequency to maintain the inlet exhaust air volume of the RTO equipment at the measured air volume F. i1 , measure the air volume F i1 The inlet or outlet air volume minus the make-up air volume.

4. The method according to claim 3, characterized in that The measured air volume F i1 ≥RTO equipment design air volume*50%.

5. The method according to claim 4, characterized in that When it is necessary to measure the energy efficiency of the RTO equipment at m different measured air volumes, adjust the fan frequency from small to large to keep the inlet exhaust air volume of the RTO equipment at the corresponding measured air volume F. ij (j=2,3,…,m), measure the air volume F ij The inlet or outlet air volume minus the make-up air volume.

6. A RTO equipment fault detection method, characterized in that: The method adopts the method described in any one of claims 1 to 5 to calculate the energy efficiency value of the RTO device under different air volumes as a reference value, and when it is detected that the difference between the energy efficiency value of the RTO device under the corresponding air volume and the reference value exceeds a set threshold, it is determined that the RTO device has a fault.

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