A RTO furnace regenerator temperature self-protection device and method

Abstract

The present invention relates to a regenerator temperature self-protection device and method for an RTO furnace, comprising the steps of: recording the temperature of each regenerator through a regenerator temperature tracking module, marking the regenerator with a heating rate greater than 5°C / min, and recording the temperature of the regenerator.

Description

Technical Field

[0001] The present invention belongs to the technical field of regenerative thermal oxidation devices, and in particular relates to a regenerative chamber temperature self-protection device and method for an RTO furnace. Background Art

[0002] Regenerative thermal oxidizers are widely used in the coal chemical industry as a solution for volatile organic compound (VOC) waste gas. The sample gas from the tail end of the methanol scrubbing process in the coal chemical industry has a low oxygen concentration and a high concentration of organic matter. Using a regenerative thermal oxidizer can fully combust the waste gas, ensuring that flue gas emissions meet environmental requirements.

[0003] RTO furnaces transfer heat and treat exhaust gases through the switching of poppet valves. However, the sealing performance of these valves is currently severely limited. This is due to deformation caused by flow field impact and high-temperature heat conduction during poppet switching. Furthermore, the levelness of the valve itself is affected. For example, if the installed valve plate is leveled to 1 degree, the corresponding leakage rate will be very high. Uneven quality of multiple poppet valves can lead to temperature differences of 100-200°C between the regenerators. Furthermore, insufficient sealing of the poppet valves can cause the regenerator temperature to "sink," exceeding the combustion chamber temperature. High temperatures near the poppet valves further degrade the rubber in the poppet valve seals, leading to high leakage rates and further regenerator temperature "sinks." Lack of monitoring or improper handling can cause thermal cracking in the furnace. Furthermore, abnormally high regenerator temperatures in RTO furnaces often affect VOC treatment efficiency, resulting in flue gas emissions that fail to meet environmental standards.

[0004] Therefore, in order to solve the problems of poppet valve leakage rate and levelness during installation, it is very important to balance the temperature of each heat storage chamber. There is an urgent need for a heat storage chamber furnace temperature protection device and method to balance the temperature of each heat storage chamber and extend the life of the heat storage chamber and the poppet valve. Summary of the Invention

[0005] The object of the present invention is to overcome the deficiencies in the prior art and to provide a device and method for self-protecting the temperature of a regenerator of an RTO furnace.

[0006] The regenerator temperature self-protection device of the RTO furnace includes: a regenerator temperature tracking module, a regenerator medium and low temperature control module, a regenerator high temperature control module, a dilution air cooling module, an air intake clockwise switching module, and an air intake counterclockwise switching module;

[0007] There are three regenerators under the combustion chamber system, namely regenerator 1#, regenerator 2# and regenerator 3#. Each regenerator is equipped with a regenerator furnace temperature tracking module; each regenerator is connected to an air inlet lift valve, an air outlet lift valve and a purge valve; each regenerator is connected to the chimney through the air outlet lift valve;

[0008] The dilution air cooling module includes an induced draft fan, which is arranged on the main air inlet; a cold air valve is provided on the cold air inlet; and the combustion chamber system is connected to the chimney through a thermal bypass valve.

[0009] As a preferred option: before the induced draft fan, the cold air inlet and the raw waste gas inlet are merged into one path, which is then divided into two branches, one is the main air inlet path, and the other is the purge branch. The raw waste gas inlet is also connected to another chimney through an emergency discharge valve.

[0010] As a preferred embodiment: the main air intake path is connected to the 1# heat storage chamber, 2# heat storage chamber and 3# heat storage chamber respectively through the air intake lift valve; the purge branch path is connected to the 1# heat storage chamber, 2# heat storage chamber and 3# heat storage chamber respectively through the purge valve; the 1# heat storage chamber, 2# heat storage chamber and 3# heat storage chamber are connected to the chimney respectively through the air outlet lift valve.

[0011] As a preference: the low temperature control module and the high temperature control module of the heat storage chamber are both connected to the heat storage chamber furnace temperature tracking module, the air inlet lift valve, the air outlet lift valve and the purge valve in the three heat storage chambers.

[0012] As a preference, 5 or 7 heat storage chambers may be provided below the combustion chamber system.

[0013] The self-protection method of the regenerator temperature self-protection device of the RTO furnace starts the air intake clockwise switching module to control the air intake clockwise, and records the temperature of each regenerator every 10 minutes through the regenerator temperature tracking module. When the temperature rise rate of a regenerator is greater than 5℃ / min for three consecutive times, it is marked as N i = N i +1, where i is the regenerator number; and different control modules are switched in real time according to the furnace temperature monitoring results, specifically,

[0014] When the average temperature of several regenerators is lower than 400℃ and the maximum temperature difference between the regenerators is greater than or equal to 50℃, the low temperature control module of the regenerator is activated; when a regenerator is recorded as the regenerator with the highest temperature for 4 to 6 consecutive times, this regenerator is marked as N i =N i +1;

[0015] When the average temperature of several regenerators is greater than or equal to 400℃ and less than 600℃, and the maximum temperature difference between the regenerators is greater than or equal to 50℃, the regenerator high temperature control module and the intake counterclockwise switching module are activated; when a regenerator is recorded as the regenerator with the highest temperature for 4 to 6 consecutive times, this regenerator is marked as N i =N i +1;

[0016] When the average temperature of several regenerators is greater than or equal to 600℃, the dilution air cooling module is started, the burner is shut down, and a fault alarm is issued.

[0017] Preferably, after the air intake clockwise switching module is turned on, the air intake of the 1# regenerator, the air outlet of the 2# regenerator, the air purge of the 3# regenerator, the air intake of the 2# regenerator, the air outlet of the 3# regenerator, the air purge of the 1# regenerator, the air intake of the 3# regenerator, the air outlet of the 1# regenerator, the air intake of the 3# regenerator, the air outlet of the 1# regenerator, the air purge of the 2 ...;

[0018] After the air intake counterclockwise switching module is turned on, the air intake of the 2# heat storage chamber, the air outlet of the 1# heat storage chamber, the 3# heat storage chamber purge, the air intake of the 3# heat storage chamber, the air outlet of the 2# heat storage chamber, the 1# heat storage chamber purge, the air intake of the 1# heat storage chamber, the air outlet of the 3# heat storage chamber, the 2# heat storage chamber purge, the air intake of the 1# heat storage chamber, the air outlet of the 3# heat storage chamber, the 2# heat storage chamber purge.

[0019] As a preferred embodiment: after starting the medium and low temperature control module of the heat storage chamber, first arrange the heat storage chambers in descending order according to temperature, increase the air intake delay time of the heat storage chamber in the first order by +3s, increase the air intake delay time of the heat storage chamber in the second order by +1s, and increase the air intake delay time of the heat storage chamber in the third order by -1s.

[0020] As a preferred option: after starting the heat storage chamber high temperature control module and the intake counterclockwise switching module, change the intake clockwise control to the intake counterclockwise control, and then arrange the heat storage chambers in descending order according to temperature. The intake delay time of the heat storage chamber in the first order is increased by +5s, the intake delay time of the heat storage chamber in the second order is increased by +3s, and the intake delay time of the heat storage chamber in the third order is increased by -1s.

[0021] As a preferred embodiment, when switching from the state of turning on the high temperature control module of the heat storage chamber to the state of turning on the medium and low temperature control module of the heat storage chamber, the air intake clockwise switching module is started to change the air intake counterclockwise control to the air intake clockwise control.

[0022] As a preference: N1, N2, N3 are counted once a month. N1 、 N2 and N3 If the N of the heat storage chamber numbered i is i is the maximum value among N1, N2 and N3, and N i Also forN1 、 N2 and N3 If the maximum value is found, the lift valve of the heat storage chamber should be repaired.

[0023] The beneficial effects of the present invention are:

[0024] 1) The present invention changes the air intake mode according to the temperature of each regenerator through the interaction between various modules, and calls the corresponding control module to adjust the air intake delay time, so as to solve the problem of uneven temperature of the regenerators in multi-chamber RTO furnaces, balance the temperature of each regenerator, and ensure the safe and stable operation of the regenerative thermal oxidizer.

[0025] 2) On-site personnel analyzed and compared Ni and Ni The comparative data can be used to determine the leakage of the lift valve at the bottom of the heat storage chamber, provide a basis for the inspection and replacement of the lift valve, maximize the utilization of each lift valve within its service life, and effectively ensure the safe and stable operation of the thermal storage thermal oxidizer, thereby extending the overall service life of the RTO device. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a flow chart of the regenerator furnace temperature self-protection method of this embodiment;

[0027] Figure 2 This is a schematic diagram of the operation of the intake clockwise switching module;

[0028] Figure 3 This is a schematic diagram of the operation of the intake counterclockwise switching module;

[0029] Figure 4 This is a structural diagram of the thermal storage thermal oxidation device of this embodiment.

[0030] Explanation of the accompanying symbols: combustion chamber system 1, 1# heat storage chamber 21, 2# heat storage chamber 22, 3# heat storage chamber 23, induced draft fan 3, cold air valve 31, exhaust gas inlet valve 4, air inlet lift valve 5, air outlet lift valve 6, purge valve 7, thermal bypass valve 8. DETAILED DESCRIPTION

[0031] The present invention will be further described below with reference to the following examples. The following examples are provided only to facilitate understanding of the present invention. It should be noted that, without departing from the principles of the present invention, it is possible for a person skilled in the art to make various modifications to the present invention, and such improvements and modifications fall within the scope of the claims of the present invention.

[0032] Example 1

[0033] As an embodiment, a regenerator temperature self-protection device for an RTO furnace, such as Figure 4As shown, the system includes three regenerators below the combustion chamber system 1: regenerator 1# 21, regenerator 2# 22, and regenerator 3# 23. Each regenerator is equipped with a regenerator furnace temperature tracking module. The combustion chamber system temperature is T0, regenerator 1# 21 is T1, regenerator 2# 22 is T2, and regenerator 3# 23 is T3. Each regenerator is connected to an air inlet lift valve 5, an air outlet lift valve 6, and a purge valve 7. Each regenerator is connected to the chimney through the air outlet lift valve 6 to output purified gas.

[0034] The dilution air cooling module includes an induced draft fan 3, located in the main air intake. A cold air valve 31 is installed in the cold air intake. The combustion chamber system 1 is connected to the chimney via a thermal bypass valve 8. Before the induced draft fan 3, the cold air intake merges with the raw material exhaust gas intake, which then splits into two branches: one for the main air intake and the other for the purge. The raw material exhaust gas intake also connects to another chimney via an emergency discharge valve. When the dilution air cooling module is activated, the opening of the cold air valve 31 is determined by the temperature of the regenerator furnace temperature tracking module. The raw material exhaust gas also connects to another chimney via an emergency discharge valve.

[0035] The main air intake path is connected to the 1# heat storage chamber 21, the 2# heat storage chamber 22 and the 3# heat storage chamber 23 respectively through the air intake lift valve 5; the purge branch path is connected to the 1# heat storage chamber 21, the 2# heat storage chamber 22 and the 3# heat storage chamber 23 respectively through the purge valve 7; the 1# heat storage chamber 21, the 2# heat storage chamber 22 and the 3# heat storage chamber 23 are connected to the chimney respectively through the air outlet lift valve 6.

[0036] The air inlet lift valve 5, air outlet lift valve 6 and purge valve 7 of the 1# heat storage chamber 21, the 2# heat storage chamber 22 and the 3# heat storage chamber 23 are alternately in the open state. When the air inlet lift valve 5, the air outlet lift valve 6 or the purge valve 7 of a certain heat storage chamber is in the open state, the opening degree of the other two valves of the same heat storage chamber is 0.

[0037] The regenerator's low-temperature and high-temperature control modules are connected to the regenerator furnace temperature tracking module, inlet lift valve 5, outlet lift valve 6, and purge valve 7 within the three regenerators. These low-temperature and high-temperature control modules primarily control temperature by controlling clockwise or counterclockwise air intake and delaying air intake.

[0038] like Figure 2 As shown, after the air intake clockwise switching module is turned on, the air intake of the 1# heat storage chamber, the air outlet of the 2# heat storage chamber, the 3# heat storage chamber purge, the air intake of the 2# heat storage chamber, the air outlet of the 3# heat storage chamber, the 1# heat storage chamber purge, the air intake of the 3# heat storage chamber, the air outlet of the 1# heat storage chamber, and the 2# heat storage chamber purge are cyclically switched.

[0039] like Figure 3As shown, after the counterclockwise air intake switching module is turned on, the air intake of the 2# regenerator, the air outlet of the 1# regenerator, the purge of the 3# regenerator, the air intake of the 3# regenerator, the air outlet of the 2# regenerator, the purge of the 1# regenerator, the air intake of the 1# regenerator, the air outlet of the 3# regenerator, the purge of the 2 ... and the air intake of the 1# regenerator, the air outlet of the 3# regenerator, and the purge of the 2# regenerator are cyclically switched.

[0040] Example 2

[0041] As another embodiment, this embodiment provides a specific method for self-protection of the regenerator temperature self-protection device of the RTO furnace proposed in the first embodiment, such as Figure 1 As shown, the air intake clockwise switching module is started to control the air intake clockwise. The temperature of each regenerator is recorded every 10 minutes through the regenerator furnace temperature tracking module. When the temperature rise rate of a regenerator is greater than 5℃ / min for three consecutive times, it is marked as N i = N i +1, where i is the thermal storage chamber number.

[0042] During the entire operation of the RTO furnace, the regenerator temperature tracking module keeps recording the temperature of each regenerator every 10 minutes and keeps N i records.

[0043] Different control modules are switched in real time according to the furnace temperature monitoring results, specifically:

[0044] When the average regenerator temperature falls below 400°C and the maximum temperature difference between the regenerators is greater than or equal to 50°C, the regenerator's medium and low temperature control module is activated. The regenerators are arranged in descending temperature order. The first regenerator has its intake delay increased by +3s, the second regenerator has its intake delay increased by +1s, and the third regenerator has its intake delay increased by -1s. The "first," "second," and "third" regenerators here are not the same as the regenerator number i; they are temporary rankings based on the regenerator temperature order.

[0045] For example, let the temperature of the 1# regenerator 21 be T1, the temperature of the 2# regenerator 22 be T2, and the temperature of the 3# regenerator 23 be T3.

[0046] When T3 = 360°C, T2 = 330°C, and T1 = 290°C, where T3(360°C) - T1(290°C) ≥ 50°C and T3 > T2 > T1, then regenerator #3 23 is the highest-order regenerator. Similarly, according to the regenerator medium and low temperature control module, the intake delay times for the three regenerators are t3 = t3 + 3, t2 = t2 + 1, and t3 = t3 - 1, respectively. This delay is applied to the clockwise intake switching module and is further extended by 40 to 60 minutes. That is, the temperature of each regenerator is recorded every 10 minutes. If regenerator #3 23 is recorded as the highest-temperature regenerator for 4 to 6 consecutive times, the highest temperature is still considered to be T3, and N3 = N3 + 1. If the highest temperature is T2, then N2 = N2 + 1.

[0047] When the average regenerator temperature is greater than or equal to 400°C and less than 600°C, and the maximum temperature difference between the regenerators is greater than or equal to 50°C, the regenerator high-temperature control module is activated. First, the counterclockwise air intake switching module is activated. The clockwise air intake switching is changed to counterclockwise air intake switching. Then, the regenerators are arranged in descending order of temperature. The air intake delay time of the regenerator in the first order is increased by +5s, the air intake delay time of the regenerator in the second order is increased by +3s, and the air intake delay time of the regenerator in the third order is increased by -1s.

[0048] For example, when T3 = 560°C, T2 = 580°C, and T1 = 490°C, where T2 (560°C) - T1 (490°C) ≥ 50°C and T2 > T3 > T1, first change the clockwise switching of the intake to the counterclockwise switching of the intake, then the intake delay time t2' = t2' + 5; t3' = t3' + 3; t1' = t1' - 1, which is applied to the counterclockwise switching module of the intake, and then delay for 40 to 60 minutes to judge the temperature of each regenerator. If the 3# regenerator 23 is recorded as the regenerator with the highest temperature 4 to 6 times in a row, then the highest temperature is T3, and N3 = N3 + 1; if the highest temperature is T2, then N2 = N2 + 1.

[0049] When the average temperature of the regenerator is greater than or equal to 600°C, the cooling air mode is required. When the average temperature of the regenerator is higher than 600°C, the dilution air cooling module is activated, the cold air valve 31 is opened, the burner is shut down, and the air intake is switched to cold air. A fault alarm is also triggered, prompting manual intervention.

[0050] N1, N2, N3, N1 、 N2 and N3 Each represents the alarm count of each heat storage chamber, which is counted once a month and outputs the count data. If the N of the heat storage chamber numbered i is i is the maximum value among N1, N2 and N3, and N i Also forN1 、 N2 and N3 The maximum value among them indicates that the lifting valve at the bottom of the heat storage chamber is leaking seriously and the lifting valve needs to be repaired. After the repair, N1, N2, N3, N1 、 N2 and N3 The alarm count is reset to zero and the count starts over for the next month. Furthermore, by using the monthly alarm statistics, staff can assess the severity of leakage in the poppet valve at the bottom of the regenerator. Furthermore, this approach effectively ensures the safe and stable operation of the regenerative thermal oxidizer.

[0051] The present invention can also be used in five- and seven-chamber RTO furnaces, i.e., those equipped with five or seven regenerators. When used in these furnaces, the delay increment for the clockwise air intake switching module and the clockwise air intake switching module must first be determined through debugging, and the order of the clockwise air intake switching module and the clockwise air intake switching module must be manually adjusted.

[0052] Compared to the prior art, the present invention protects and extends the lifespan of the regenerator and poppet valve at the bottom of the RTO furnace, reducing maintenance time, predicting the location of the poppet valve with severe leakage, and reducing the trial-and-error rate during maintenance, thereby fully utilizing the service life of poppet valves that do not yet require maintenance. Furthermore, maintaining stable temperatures in each regenerator is essential for the smooth operation of the RTO furnace. The present invention's regenerator temperature self-protection device enables the pre-determination of leaks in the poppet valve at the bottom of the regenerator, while also maximizing the lifespan of the RTO unit and ultimately ensuring the safe operation of the regenerative thermal oxidizer.

Claims

1. A self-protection method for a regenerator temperature self-protection device of an RTO furnace, characterized in that: include: Regenerator furnace temperature tracking module, regenerator medium and low temperature control module, regenerator high temperature control module, dilution air cooling module, air intake clockwise switching module and air intake counterclockwise switching module; Three regenerators are provided below the combustion chamber system (1), namely, regenerator 1# (21), regenerator 2# (22) and regenerator 3# (23), each of which is provided with a regenerator furnace temperature tracking module; each regenerator is connected to an air inlet lift valve (5), an air outlet lift valve (6) and a purge valve (7); each regenerator is connected to a chimney via an air outlet lift valve (6); The dilution air cooling module includes an induced draft fan (3), which is arranged on the main air inlet; a cold air inlet is provided with a cold air valve (31); the combustion chamber system (1) is connected to the chimney through a thermal bypass valve (8); before the induced draft fan (3), the cold air inlet and the raw material waste gas inlet are merged into one path, and then divided into two branches, one for the main air inlet and the other for the purge branch. The raw material waste gas inlet is also connected to another chimney through an emergency discharge valve; the main air inlet is respectively connected to the 1# heat storage chamber (21) and the 2# heat storage chamber through the air inlet lift valve (5). The heat chamber (22) and the 3# heat storage chamber (23); the purge branch is connected to the 1# heat storage chamber (21), the 2# heat storage chamber (22) and the 3# heat storage chamber (23) respectively through the purge valve (7); the 1# heat storage chamber (21), the 2# heat storage chamber (22) and the 3# heat storage chamber (23) are connected to the chimney respectively through the outlet lift valve (6); the heat storage chamber medium and low temperature control module and the heat storage chamber high temperature control module are connected to the heat storage chamber furnace temperature tracking module, the air inlet lift valve (5), the air outlet lift valve (6) and the purge valve (7) in the three heat storage chambers; Start the air intake clockwise switching module to control the air intake clockwise. The regenerator temperature tracking module records the temperature of each regenerator every 10 minutes. When the temperature rise rate of a regenerator is greater than 5℃ / min for three consecutive times, it is marked as +1, where Number the regenerator; and switch different control modules in real time according to the furnace temperature monitoring results, specifically, When the average temperature of the three regenerators is lower than 400℃ and the maximum temperature difference between the regenerators is greater than or equal to 50℃, the low temperature control module of the regenerator is started; when a regenerator is recorded as the regenerator with the highest temperature for 4 to 6 consecutive times, the regenerator is marked as ; When the average temperature of the three regenerators is greater than or equal to 400℃ and less than 600℃, and the maximum temperature difference between the regenerators is greater than or equal to 50℃, the regenerator high temperature control module and the intake counterclockwise switching module are activated; when a regenerator is recorded as the regenerator with the highest temperature for 4 to 6 consecutive times, this regenerator is marked as ; When the average temperature of the three regenerators is greater than or equal to 600°C, the dilution air cooling module is started, the burner is shut down, and a fault alarm is issued.

2. The self-protection method of the regenerator temperature self-protection device of the RTO furnace according to claim 1, characterized in that: After the air intake clockwise switching module is turned on, the switching is cyclically performed in the order of air intake in the 1# heat storage chamber (21), air outlet in the 2# heat storage chamber (22), and purge in the 3# heat storage chamber (23); air intake in the 2# heat storage chamber (22), air outlet in the 3# heat storage chamber (23), and purge in the 1# heat storage chamber (21); air intake in the 3# heat storage chamber (23), air outlet in the 1# heat storage chamber (21), and purge in the 2# heat storage chamber (22); After the counterclockwise air intake switching module is turned on, the air intake of the 2# heat storage chamber (22), the air outlet of the 1# heat storage chamber (21), the 3# heat storage chamber (23) is purged, the air intake of the 3# heat storage chamber (23), the air outlet of the 2# heat storage chamber (22), the 1# heat storage chamber (21) is purged, and the air intake of the 1# heat storage chamber (21), the air outlet of the 3# heat storage chamber (23), the 2# heat storage chamber (22) is purged.

3. The self-protection method of the regenerator temperature self-protection device of the RTO furnace according to claim 1, characterized in that: After starting the regenerator's medium and low temperature control module, first sort the regenerators in descending order of temperature. The air intake delay time of the regenerator in the first order is increased by +3s, the air intake delay time of the regenerator in the second order is increased by +1s, and the air intake delay time of the regenerator in the third order is increased by -1s.

4. The self-protection method of the regenerator temperature self-protection device of the RTO furnace according to claim 1, characterized in that: After starting the heat storage chamber high temperature control module and the intake counterclockwise switching module, the intake clockwise control is changed to the intake counterclockwise control, and then the heat storage chambers are arranged in descending order according to temperature. The intake delay time of the heat storage chamber in the first order is increased by +5s, the intake delay time of the heat storage chamber in the second order is increased by +3s, and the intake delay time of the heat storage chamber in the third order is increased by -1s; when switching from the state of turning on the heat storage chamber high temperature control module to the state of turning on the heat storage chamber medium and low temperature control module, start the intake clockwise switching module and change the intake counterclockwise control to the intake clockwise control.

5. The self-protection method of the regenerator temperature self-protection device of the RTO furnace according to claim 1, characterized in that: Monthly statistics 、 、 、 、 and If the data is numbered The regenerator for 、 and The maximum value in Also for 、 and If the maximum value is found, the lift valve of the heat storage chamber should be repaired.

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