A temperature regulation device and temperature regulation method for denitration catalyst regeneration

Abstract

The present invention relates to a temperature regulation device and a temperature regulation method for denitration catalyst regeneration. The device includes a first furnace unit, a second furnace unit and a temperature regulation component. The method includes: putting a catalyst into the first furnace unit, closing the first pipeline, heating the first furnace unit to a preset temperature threshold; opening the first pipeline and turning on the induced draft fan, adjusting the rotational speed of the induced draft fan to control the cooling rate in the first furnace unit within a first preset speed range. When the temperature difference between the first furnace unit and the second furnace unit is within a preset temperature difference range, close the first pipeline, and connect the first furnace unit to the atmosphere, and adjust the rotational speed of the induced draft fan to control the cooling rate in the first furnace unit within a second preset speed range. When the temperature in the first furnace unit reaches room temperature, turn off the induced draft fan and take out the catalyst. The device and method provided by the present invention not only control the first furnace unit and the second furnace unit to alternately heat up and cool down, but also can accurately adjust the heating / cooling rate, and also utilize the waste heat in the furnace to save energy.

Description

Technical Field

[0001] The present invention belongs to the field of catalyst modules, and particularly relates to a temperature regulation device and a temperature regulation method for denitration catalyst regeneration. Background Art

[0002] At present, most boiler and furnace equipment are installed with SCR denitration devices in the tail flue, and the core component of the SCR denitration device is the SCR catalyst. The main function of the SCR catalyst is to carry out denitration treatment on the tail gas of boilers and furnaces. During the long-term operation of boiler and furnace equipment, due to a large amount of fly ash and substances such as arsenic and lead that are likely to cause catalyst poisoning in the tail gas, the SCR catalyst will gradually accumulate ash and become poisoned, and its denitration performance will gradually decline. Seriously, it may lead to failures in the operation of the entire unit. For such catalysts, the SCR catalyst regeneration technology can be used to clean the ash accumulated on the catalyst and other adsorbed poisoning substances to restore the denitration performance of the catalyst.

[0003] Currently, the catalyst regeneration technology mainly involves wet cleaning, in which the catalyst is soaked in a chemical agent for a certain period of time, so that the impurities adsorbed on the catalyst can be cleaned and the active substances can be loaded on the catalyst. After wet cleaning, a drying and calcination process is required to remove the moisture in the catalyst and restore the mechanical strength of the catalyst. The current drying and calcination process for catalyst regeneration mainly involves raising the temperature of the furnace to 100°C - 400°C, then maintaining this temperature for a certain period of time, and finally cooling down. However, during the heating and cooling processes of the catalyst in the furnace, it is necessary to slowly raise or lower the temperature, otherwise cracks or even breakage may occur to the catalyst due to the action of internal stress, and such regenerated catalyst will be meaningless. Summary of the Invention

[0004] The purpose of the present invention is to provide a temperature regulation device and a temperature regulation method for denitration catalyst regeneration.

[0005] To achieve the above purpose, the technical solution adopted by the present invention is:

[0006] On the one hand, the present invention provides a temperature regulation device for denitration catalyst regeneration, which includes:

[0007] A first furnace unit and a second furnace unit, the first furnace unit and the second furnace unit have spaces for storing catalysts, the first furnace unit and the second furnace unit have openable and closable ventilation ends, the ventilation ends include a first ventilation end, the first ventilation ends of the first furnace unit and the second furnace unit are connected through a first pipeline, and a first ventilation port for communicating with the atmosphere is opened on the first pipeline;

[0008] Temperature regulation component, the temperature regulation component includes a heater and a blower, the heater is used to heat the first furnace unit and the second furnace unit, the blower is communicated with the first pipeline, and it is used to guide the gas to circulate between the first furnace unit and the second furnace unit.

[0009] Further, the ventilation end further includes a second ventilation end, the second ventilation end is connected with a ventilation pipe, and the heater is communicated with the ventilation pipe; the temperature regulation component further includes an induced draft fan, the induced draft fan is communicated with the ventilation pipe, and the induced draft fan is used to introduce the heat provided by the heater into the first furnace unit and the second furnace unit.

[0010] Further, the device further includes a controller, and the controller is used to control the start / stop and rotation speed of the induced draft fan and the blower.

[0011] Further, the ventilation end further includes a third ventilation end, the third ventilation ends of the first furnace unit and the second furnace unit are communicated through a second pipeline, and a second ventilation end for communicating with the atmosphere is opened on the second pipeline.

[0012] On the other hand, the present invention also provides a temperature regulation method for the denitration catalyst regeneration process. This method uses the temperature regulation device for denitration catalyst regeneration, and it includes the following steps:

[0013] S1. Heating up: Put the catalyst to be dried into the first furnace unit, close the first pipeline, heat up the first furnace unit to a preset temperature threshold and keep it at this preset temperature threshold for a preset time;

[0014] S2. Cooling down: Open the first pipeline to connect the first furnace unit and the second furnace unit, and at the same time start the blower located on the first pipeline, adjust the rotation speed of the blower to control the cooling speed in the first furnace unit within a first preset speed range. When the temperature difference between the first furnace unit and the second furnace unit is within a preset temperature difference range, close the first pipeline, and connect the first furnace unit with the atmosphere, and adjust the rotation speed of the blower to control the cooling speed in the first furnace unit within a second preset speed range. When the temperature in the first furnace unit reaches room temperature, turn off the blower and take out the processed catalyst.

[0015] Further, in step S1, when putting the catalyst to be dried into the first furnace unit, put the catalyst to be dried into the second furnace unit at the same time; or first put the catalyst to be dried into the first furnace unit, and when the first furnace unit keeps at this preset temperature threshold for a preset time, then put the catalyst to be dried into the second furnace unit.

[0016] Further, after step S2, the following steps are further included:

[0017] S3. Re-heating: Close the first pipeline, heat the second furnace monomer to a preset temperature threshold and maintain it at this preset temperature threshold for a preset time.

[0018] S4. Re-cooling: Open the first pipeline to connect the first furnace monomer with the second furnace monomer. At the same time, turn on the induced draft fan located on the first pipeline, and adjust the rotation speed of the induced draft fan to control the cooling rate inside the second furnace monomer within the first preset speed range. When the temperature difference between the first furnace monomer and the second furnace monomer is within the preset temperature difference range, close the first pipeline, and connect the second furnace monomer with the atmosphere. Then, adjust the rotation speed of the induced draft fan to control the cooling rate inside the second furnace monomer within the second preset speed range. When the temperature inside the second furnace monomer reaches room temperature, turn off the induced draft fan and take out the treated catalyst.

[0019] Further, the first preset speed is greater than the second preset speed.

[0020] Further, the preset temperature difference range is 0 - 10°C.

[0021] Further, in step S1, the heating rate of the first furnace monomer is 3 - 10°C / min; in step S3, the heating rate inside the second furnace monomer is 3 - 10°C / min.

[0022] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art: The temperature adjustment device for denitration catalyst regeneration provided by the present invention is provided with a first furnace monomer, a second furnace monomer, and a temperature adjustment component. Through the temperature adjustment component, not only can the heating / cooling rates inside the first furnace monomer and the second furnace monomer be accurately adjusted to prevent overheating and overcooling, but also the waste heat inside the furnace can be fully reused, saving energy.

[0023] The temperature adjustment method for the denitration catalyst regeneration process provided by the present invention can not only control the catalyst inside the first furnace monomer and the second furnace monomer to alternately heat up and cool down by controlling the opening and closing of the heater, the opening and closing of the valve, and the start-stop and rotation speed of the induced draft fan, but also accurately adjust the heating / cooling rate, and can fully reuse the waste heat inside the furnace, saving energy. Description of the Drawings

[0024] Attached Figure 1 is a schematic structural diagram of the temperature adjustment device for denitration catalyst regeneration of the present invention.

[0025] Reference numerals: 1 - first valve, 2 - second valve, 3 - third valve, 4 - fourth valve, 5 - fifth valve, 6 - sixth valve, 7 - seventh valve, 8 - eighth valve, 9 - first furnace monomer, 10 - second furnace monomer, 11 - first induced draft fan, 12 - second induced draft fan, 13 - first induced draft fan, 14 - second induced draft fan, 15 - first pipeline, 16 - second pipeline, 17 - support. Detailed Embodiments

[0026] The present invention will be further described below in conjunction with the embodiments shown in the accompanying drawings.

[0027] This embodiment provides a temperature adjustment device for denitration catalyst regeneration. Refer to Figure 1 , which includes a first furnace unit 9, a second furnace unit 10 and a temperature adjustment component. The first furnace unit 9 and the second furnace unit 10 have spaces for storing catalysts. The first furnace unit 9 and the second furnace unit 10 have openable and closable ventilation ends. The ventilation ends include a first ventilation end. The first ventilation ends of the first furnace unit 9 and the second furnace unit 10 are connected through a first pipeline 15, enabling the gas in the first furnace unit 9 and the second furnace unit 10 to circulate. When there is high-temperature gas (high temperature refers to a temperature higher than room temperature) in the first furnace unit 9 and low-temperature gas (low temperature refers to room temperature) in the second furnace unit 10, gas exchange between the first furnace unit 9 and the second furnace unit 10 is achieved through the first pipeline, and the waste heat can be fully reused, saving energy.

[0028] A first ventilation end for communicating with the atmosphere (external environment) is provided on the first pipeline 15 (as indicated by the arrow d in Figure 1 ). The low-temperature gas in the external environment enters the first furnace unit 9 and / or the second furnace unit 10 through the first pipeline 15 and the first ventilation end, while the high-temperature gas in the first furnace unit 9 and / or the second furnace unit 10 enters the external environment through the first pipeline 15 and the first ventilation end, forming a cycle.

[0029] The temperature adjustment component includes a heater and a blower. The heater is used to heat the first furnace unit 9 and the second furnace unit 10. The blower is connected to the first pipeline 15 and is used to guide the gas to circulate between the first furnace unit 9 and the second furnace unit 10. By adjusting the rotation speed of the blower, the heating / cooling speed in the first furnace unit and the second furnace unit can be accurately adjusted.

[0030] The ventilation end further includes a second ventilation end. The second ventilation end is connected with a ventilation pipe. The heater is connected to the ventilation pipe and is used to provide heat. The temperature adjustment component further includes an induced draft fan. The induced draft fan is located outside the first furnace unit 9 and the second furnace unit 10 and is connected to the ventilation pipe. The induced draft fan is used to introduce the heat (high-temperature gas) provided by the heater into the first furnace unit 9 or the second furnace unit 10 to heat the catalyst in the first furnace unit 9 or the second furnace unit 10, and the heating speed of the first furnace unit 9 or the second furnace unit 10 can be adjusted. The heater is located outside the first furnace unit 9 and the second furnace unit 10, and the heater is farther away from the second ventilation end than the induced draft fan.

[0031] The heater can also be multiple groups of heating tubes, and the multiple heating tubes are evenly distributed around the first furnace unit 9 and the second furnace unit 10.

[0032] The ventilation end further includes a third ventilation end. The third ventilation ends of the first furnace unit 9 and the second furnace unit 10 are connected through a second pipeline 16, enabling the gas in the first furnace unit 9 and the second furnace unit 10 to circulate. A second ventilation end for communicating with the atmosphere (external environment) is provided on the second pipeline 16 (see Figure 1 the arrow b shown in

[0033] which can accelerate and make the gas flow between the first furnace unit 9, the second furnace unit 10 and the atmosphere more evenly, being more conducive to temperature reduction.

[0034] The blower includes a first draft fan 13 and a second draft fan 14 provided on the first pipeline 15. The first draft fan 13 and the second draft fan 14 are respectively located on both sides of the first ventilation end. The first draft fan 13 is close to the first ventilation end of the first furnace unit 9, and the second draft fan 14 is close to the first ventilation end of the second furnace unit 10, blowing from the second furnace unit 10 to the first furnace unit 9, thus playing a role in the internal circulation of the first furnace unit 9 and the second furnace unit 10. By adjusting the rotation speeds of the first draft fan 13 and the second draft fan 14, the heating / cooling speeds inside the first furnace unit and the second furnace unit can be accurately adjusted. Since a second ventilation end for communicating with the atmosphere (external environment) is provided on the second pipeline 16, by adjusting the rotation speeds of the first draft fan 13 and the second draft fan 14, the connection between the first furnace unit, the second furnace unit and the atmosphere can be adjusted to achieve slow cooling.

[0035] The device includes a furnace main body. The furnace main body is divided into a first furnace unit 9 and a second furnace unit 10 by a partition layer. An insulating coating (an insulating coating made of heat-resistant insulating material) is provided outside the partition layer, or the partition layer is made of heat-resistant insulating material. The heat-resistant insulating material is a known material and is not limited herein. The device also includes a bracket 17 for supporting the furnace main body.

[0036] Or the first furnace unit 9 and the second furnace unit 10 are two independent individuals, and the two furnace units are connected through the first pipeline 15 and / or the second pipeline 16.

[0037] The outer walls of the first furnace unit 9 and the second furnace unit 10 are both made of heat-resistant insulating material. The heat-resistant insulating material is a known material and is not limited herein.

[0038] One or more valves are provided on the ventilation end, the first ventilation end and the second ventilation end. The valves are used to control the opening and closing of the corresponding ventilation end, the first ventilation end and the second ventilation end. By controlling the opening and closing through the valves, it is easy to operate and implement.

[0039] The device also includes a controller, which is used to control the start and stop of the induced draft fan and the induced draft fan and the speed (frequency), and the valve is directly controlled by the controller. The controller controls the first furnace monomer 9 and the second furnace monomer 10 to alternately increase and decrease the temperature by controlling the opening and closing of the heater (and / or the start and stop of the induced draft fan, the speed), the opening and closing of the valve, and the start and stop of the induced draft fan.

[0040] In a preferred embodiment, the specific structure of the temperature regulating device for regenerating the denitration catalyst is as follows: a first induced draft fan 11 and a first heater (located at Figure 1 The first ventilation end is provided with a first valve 1, and the first valve 1 is connected to the first heater and the first furnace monomer 9. When the first valve 1 is opened, the heat provided by the first heater can enter the first furnace monomer 9. When the first valve 1 is closed, the heat provided by the first heater cannot enter the first furnace monomer 9, and the heating of the first furnace monomer 9 is stopped. The second pipe 16 and the second ventilation end are provided with a second valve 2, a third valve 3 (the third valve 3 is located at the second ventilation end), and a fourth valve 4.

[0041] A fifth valve 5 is provided on the second ventilation end of the second furnace monomer 10, and the fifth valve 5 connects the second heater and the second furnace monomer 10. When the fifth valve 5 is opened, the heat provided by the second heater can enter the second furnace monomer 10. When the fifth valve 5 is closed, the heat provided by the first heater cannot enter the second furnace monomer 10, and the heating of the second furnace monomer 10 stops.

[0042] The first pipe 15 and the first ventilation end are provided with a sixth valve 6, a seventh valve 7 (the seventh valve 7 is located at the first ventilation end), and an eighth valve 8; the first ventilation end of the second furnace unit 10 is provided with a second induced draft fan 12, a second heater (located at Figure 1 The first pipeline 15 is provided with a first air guide fan 13 and a second air guide fan 14, and the sixth valve 6 and the seventh valve 7 are located on the pipeline between the first air guide fan 13 and the second air guide fan 14.

[0043] This embodiment also provides a method for regulating the temperature during the regeneration of a denitration catalyst. The method uses the above-mentioned temperature regulating device for regeneration of a denitration catalyst and comprises the following steps:

[0044] S1, heating: putting the catalyst to be dried into the first furnace monomer 9, closing the first pipeline 15 so that the first furnace monomer 9 is not connected with the second furnace monomer 10, heating the first furnace monomer 9 to a preset temperature threshold and keeping it at the preset temperature threshold for a preset time. In this step, the heating rate is preferably unchanged;

[0045] S2. Cooling: Open the first pipeline 15 to connect the first furnace unit 9 with the second furnace unit 10. At the same time, turn on the induced draft fan located on the first pipeline 15 and adjust the rotational speed of the induced draft fan to control the cooling rate in the first furnace unit 9 within the first preset speed range (the low-temperature gas in the second furnace unit 10 is sent into the first furnace unit 9 to cool the catalyst in the first furnace unit 9. At the same time, the high-temperature gas in the first furnace unit 9 enters the second furnace unit 10 to heat the catalyst in the second furnace unit 10. By adjusting the rotational speed of the induced draft fan, the heating rate in the second furnace unit 10 can also be adjusted). When the temperature difference between the first furnace unit 9 and the second furnace unit 10 is within the preset temperature difference range (at this time, the temperature in the second furnace unit 10 will not continue to rise. If the connection between the first furnace unit 9 and the second furnace unit 10 is maintained, the processing time will increase), close the first pipeline 15 to disconnect the first furnace unit 9 from the second furnace unit 10 (stop heating the second furnace unit 10), and connect the first furnace unit 9 to the atmosphere (at this time, the temperature in the first furnace unit 9 is already relatively low, and the high-temperature gas in the first furnace unit 9 cannot continue to heat the catalyst in the second furnace unit 10. Connecting directly to the atmosphere can further rapidly cool the temperature). And adjust the rotational speed of the induced draft fan to control the cooling rate in the first furnace unit 9 within the second preset speed range. The function is that under the action of the induced draft fan, the low-temperature gas in the external environment enters the first furnace unit 9, and the high-temperature gas in the first furnace unit 9 enters the external environment. When the temperature in the first furnace unit 9 reaches room temperature, turn off the induced draft fan and take out the processed catalyst.

[0046] There are two cases for placing the catalyst to be dried in the first furnace unit 9 and the second furnace unit 10. In step S1, when placing the catalyst to be dried in the first furnace unit 9, place the catalyst to be dried in the second furnace unit 10 at the same time; or first place the catalyst to be dried in the first furnace unit 9, and when the first furnace unit 9 maintains the preset time at the preset temperature threshold, then place the catalyst to be dried in the second furnace unit 10.

[0047] After step S2, the following steps are further included:

[0048] S3. Reheating: Close the first pipeline 15 to disconnect the first furnace unit 9 from the second furnace unit 10, heat the second furnace unit 10 to the preset temperature threshold and maintain it for the preset time at this preset temperature threshold. In this step, the heating rate is preferably kept constant;

[0049] S4. Further temperature reduction: Open the first pipeline 15 to connect the first furnace monomer 9 with the second furnace monomer 10. Meanwhile, turn on the induced draft fan located on the first pipeline 15 (meanwhile, the high-temperature gas in the second furnace monomer 10 enters the first furnace monomer 9 to heat the catalyst in the first furnace monomer 9. By adjusting the rotation speed of the induced draft fan, the heating rate in the first furnace monomer 9 can also be adjusted. At the same time, the low-temperature gas in the first furnace monomer 9 is sent into the second furnace monomer 10 to cool the catalyst in the second furnace monomer 10), adjust the rotation speed of the induced draft fan to control the temperature reduction rate in the second furnace monomer 10 within the first preset speed range. When the temperature difference between the first furnace monomer 9 and the second furnace monomer 10 is within the preset temperature difference range (at this time, the temperature in the first furnace monomer 9 will not continue to rise. If the connection between the second furnace monomer 10 and the first furnace monomer 9 is continuously maintained, the processing time will be increased), close the first pipeline 15 to disconnect the first furnace monomer 9 from the second furnace monomer 10 (stop heating the first furnace monomer 9), and connect the second furnace monomer 10 to the atmosphere (at this time, the temperature in the second furnace monomer 10 is already relatively low, and the high-temperature gas in the second furnace monomer 10 cannot continue to heat the catalyst in the first furnace monomer 9. Directly connecting to the atmosphere can further rapidly reduce the temperature), and adjust the rotation speed of the induced draft fan to control the temperature reduction rate in the second furnace monomer 10 within the second preset speed range. The function is: Under the action of the induced draft fan, the low-temperature gas in the external environment enters the second furnace monomer 10, while the high-temperature gas in the second furnace monomer 10 enters the external environment. When the temperature in the second furnace monomer 10 reaches room temperature, turn off the induced draft fan and take out the processed catalyst.

[0050] The controller can calculate the temperature reduction / heating rate by receiving the temperatures detected by the thermocouples in the first furnace monomer 9 and the second furnace monomer 10 at different times.

[0051] The above steps S1, S2, S3, and S4 realize the alternating heating and cooling of the catalysts in the first furnace monomer 9 and the second furnace monomer 10, and both the heating rate and the cooling rate can be controlled. When processing new catalysts, only the above steps need to be repeated.

[0052] Preferably, the first preset speed is greater than the second preset speed. For example, the first preset speed is preferably 5 °C / min, and the second preset speed is preferably 3 °C / min. When adjusting the rotation speed of the induced draft fan to control the temperature reduction rate in the first furnace monomer 9 within the first preset speed range, the temperature in the first furnace monomer 9 is relatively high, and at this time, the temperature reduction rate in the first furnace monomer 9 is relatively large; when subsequently adjusting the rotation speed of the induced draft fan to control the temperature reduction rate in the first furnace monomer 9 within the second preset speed range, the temperature in the first furnace monomer 9 has decreased, and the first furnace monomer 9 is connected to the atmosphere. At this time, the temperature reduction rate in the first furnace monomer 9 is relatively small.

[0053] The preset temperature difference range is 0 - 10 °C. Preferably, when the temperatures in the first furnace unit 9 and the second furnace unit 10 are equal, the first pipeline 15 is closed to disconnect the first furnace unit 9 from the second furnace unit 10. The preset temperature threshold is set according to actual needs.

[0054] In step S1, the heating rate of the first furnace unit 9 is 3 - 10 °C / min, preferably 5 °C / min; in step S3, the heating rate in the second furnace unit 10 is 3 - 10 °C / min, preferably 5 °C / min, which can ensure slow and uniform heating.

[0055] In a preferred embodiment, the temperature adjustment method for the denitration catalyst regeneration process is specifically as follows:

[0056] Before step S1 starts, all valves can be closed or opened; neither the first furnace unit 9 nor the second furnace unit 10 is heated.

[0057] S1. First, put the first batch of catalysts to be dried into the first furnace unit 9, open the first valve 1, the first induced draft fan 11, and the first heater, introduce high-temperature gas into the first furnace unit 9, and heat the catalysts to be dried in the first furnace unit 9. At the same time, close the second valve 2 and the sixth valve 6 (i.e., close the first pipeline 15 and the second pipeline 16 to disconnect the first furnace unit 9 from the second furnace unit 10) to prevent heat from entering the second furnace unit 10 and causing heat loss; when the temperature in the first furnace unit 9 reaches the preset temperature threshold and remains for the preset time, turn off the first heater to stop heating, and at the same time close the first valve 1 and the first induced draft fan 11;

[0058] S2. After putting the next batch of catalysts to be dried into the second furnace unit 10, open the second valve 2, the fourth valve 4, the sixth valve 6, the eighth valve 8, the first draft fan 13, and the second draft fan 14 (i.e., open the first pipeline 15 and the second pipeline 16 to connect the first furnace unit 9 to the second furnace unit 10), and at the same time close the third valve 3 and the seventh valve 7. Under the action of the first draft fan 13 and the second draft fan 14, the low-temperature gas in the second furnace unit 10 is sent into the first furnace unit 9 through the first pipeline 15 to cool the catalysts in the first furnace unit 9. At the same time, the high-temperature gas in the first furnace unit 9 is sent into the second furnace unit 10 through the second pipeline 16 to heat the catalysts in the second furnace unit 10, fully recycling the waste heat in the first furnace unit 9 and saving energy;

[0059] After the first draft fan 13 and the second draft fan 14 are turned on, by adjusting the rotation speeds of the first draft fan 13 and the second draft fan 14, the cooling rate in the first furnace unit 9 is controlled within the first preset speed range to precisely control the cooling rate in the first furnace unit 9 and prevent the cooling in the first furnace unit 9 from being too fast. When the temperature difference between the first furnace unit 9 and the second furnace unit 10 is within the preset temperature difference range (for example, the temperatures in the first furnace unit 9 and the second furnace unit 10 are the same), the fourth valve 4, the eighth valve 8, and the second draft fan 14 are closed, and the internal circulation of the first furnace unit 9 and the second furnace unit 10 stops; at the same time, the third valve 3 and the seventh valve 7 are opened, so that the first ventilation end on the first pipeline 15 and the second ventilation end on the second pipeline 16 are respectively connected to the atmosphere. Under the action of the first draft fan 13, the low-temperature gas in the external environment enters the first furnace unit 9 through the first pipeline 15, and the high-temperature gas in the first furnace unit 9 enters the external environment through the second pipeline 16. At this time, the rotation speed of the first draft fan 13 is adjusted to control the cooling rate in the first furnace unit 9 within the second preset speed range. The controller controls the rotation speed of the first draft fan 13 by receiving the temperature detected by the thermocouple in the first furnace unit 9, and further controls the cooling rate in the first furnace unit 9; when the temperature in the first furnace unit 9 slowly drops to room temperature, the first draft fan 13 is closed, and the furnace door of the first furnace unit 9 is opened to take out the processed catalyst. At this time, the heating and cooling treatment of the catalyst in the first furnace unit 9 is completed.

[0060] The following are the specific operations for the heating and cooling treatment of the catalyst in the second furnace unit 10:

[0061] S3. The catalyst in the second furnace unit 10 has been slowly heated to a certain temperature by the high-temperature gas in the first furnace unit 9. At this time, the fifth valve 5 and the second induced draft fan 12 are opened (at this time, the first pipeline 15 and the second pipeline 16 are closed to disconnect the first furnace unit 9 from the second furnace unit 10), and at the same time, the second heater is turned on to start heating. The second induced draft fan 12 introduces the high-temperature gas into the second furnace unit 10 to continue heating the catalyst in the second furnace unit 10. After the temperature in the second furnace unit 10 reaches the preset temperature threshold and remains for the preset time, the second heater is turned off to stop heating, and at the same time, the fifth valve 5 and the second induced draft fan 12 are closed;

[0062] S4. After the next batch of catalysts to be dried are placed in the first furnace unit 9, the fourth valve 4, the eighth valve 8, the first draft fan 13, and the second draft fan 14 are opened (that is, the first pipeline 15 and the second pipeline 16 are opened to connect the first furnace unit 9 to the second furnace unit 10). Under the action of the first draft fan 13 and the second draft fan 14, the high-temperature gas in the second furnace unit 10 is sent into the first furnace unit 9 through the first pipeline 15 to heat the catalyst in the first furnace unit 9. At the same time, the low-temperature gas in the first furnace unit 9 is sent into the second furnace unit 10 through the second pipeline 16 to cool the catalyst in the second furnace unit 10.

[0063] After turning on the first draft fan 13 and the second draft fan 14, by adjusting the rotation speeds of the first draft fan 13 and the second draft fan 14, the temperature reduction speed in the second furnace unit 10 is controlled within the first preset speed range to accurately control the temperature reduction speed in the second furnace unit 10 and prevent excessive temperature reduction. When the temperature difference between the first furnace unit 9 and the second furnace unit 10 is within the preset temperature difference range (for example, the temperatures in the first furnace unit 9 and the second furnace unit 10 are the same), the second valve 2, the sixth valve 6, and the first draft fan 13 are closed, and the circulation inside the first furnace unit 9 and the second furnace unit 10 stops; meanwhile, the third valve 3 and the seventh valve 7 are opened, so that the first ventilation end on the first pipeline 15 and the second ventilation end on the second pipeline 16 are respectively communicated with the atmosphere. Under the action of the second draft fan 14, the low-temperature gas in the external environment enters the second furnace unit 10 through the first pipeline 15, and the high-temperature gas in the second furnace unit 10 enters the external environment through the second pipeline 16; at this time, the rotation speed of the second draft fan 14 is adjusted to control the temperature reduction speed in the second furnace unit 10 within the second preset speed range. The controller controls the rotation speed of the second draft fan 14 by receiving the temperature detected by the thermocouple in the second furnace unit 10, and further controls the temperature reduction speed in the second furnace unit 10; when the temperature in the second furnace unit 10 slowly drops to room temperature, the second draft fan 14 is closed, and the furnace door of the second furnace unit 10 is opened to take out the processed catalyst. At this time, the heating and cooling treatment of the catalyst in the second furnace unit 10 is completed.

[0064] Next, by repeating steps S1 - S4, subsequent batches of catalysts can be dried.

[0065] Comparative example

[0066] Only 1 furnace unit is set, and 1 catalyst module is placed in the furnace unit. Each catalyst module is assembled by 6×12 monomers, and each monomer has 18×18 holes and a length of 1000 mm.

[0067] The drying process is as follows: quickly heat up to 230°C, and then maintain the drying temperature of 230°C for 5 hours. After drying is completed, directly open the furnace door to cool down to room temperature (25°C) and then take out the catalyst. It is observed that due to the excessive temperature reduction speed, the internal stress of the catalyst is too high, and the clicking sound of the catalyst cracking can be clearly heard. After a period of time, obvious cracks can be found on the catalyst; the dried catalyst provided in the comparative example is subjected to a strength test, and it is known that the axial compressive strength and the radial compressive strength of the catalyst are 1.84 MPa and 0.36 MPa respectively.

[0068] This embodiment

[0069] The catalyst is dried by using the temperature regulation method for the denitration catalyst regeneration process provided in this embodiment, specifically as follows: Set the first furnace unit 9 and the second furnace unit 10, put another module of the same batch of catalysts into the first furnace unit 9, and raise the temperature before drying from room temperature to 230 °C at a rate of 5 °C / min and keep it for 5 hours; then start to cool down. When circulating between the first furnace unit 9 and the second furnace unit 10, control the speed of the induced draft fan to control the cooling rate of the first furnace unit 9 at 5 °C / min; when the temperature signals of the first furnace unit 9 and the second furnace unit 10 returned by the thermocouple are the same (the measured temperatures of the two furnaces are both 100 °C), start the first furnace unit 9 to communicate with the external environment for circulating cooling, and control the speed of the induced draft fan to control the cooling rate of the first furnace unit 9 at 3 °C / min; when the catalyst in the first furnace unit 9 cools down to room temperature, open the furnace door of the first furnace unit 9, take out the processed catalyst module, and observe that there are no cracks in the catalyst. The dried catalyst provided in this embodiment is subjected to a strength test, and it is known that the axial compressive strength and the radial compressive strength of the catalyst are 2.15 MPa and 0.81 Mpa respectively, and its compressive strength is significantly better than that of the catalyst in the comparative example.

[0070] In this embodiment, the slow heating / cooling of the denitration catalyst regeneration process is realized through the temperature regulation method for the denitration catalyst regeneration process. When heating and then cooling the catalyst in the first furnace unit, heat the catalyst to be dried in the second furnace unit. By controlling the opening and closing of the heater (and / or the start / stop and speed of the induced draft fan), the opening and closing of the valve, and the start / stop and speed of the induced draft fan, a certain power of gas is set to circulate between the first furnace unit and the second furnace unit, so as to slowly and stably realize the slow heating / cooling of the first furnace unit and the second furnace unit in the catalyst regeneration process.

[0071] The above embodiments are only used to illustrate the technical concept and characteristics of the present invention, and their purpose is to enable those who are familiar with this technology to understand the content of the present invention and implement it accordingly, and it cannot be used to limit the protection scope of the present invention. All equivalent changes or modifications made according to the spirit and essence of the present invention should be covered within the protection scope of the present invention.

Claims

1. A temperature regulation device for denitration catalyst regeneration, characterized in that: Comprising: A first furnace unit and a second furnace unit, the first furnace unit and the second furnace unit having a space for storing a catalyst, the first furnace unit and the second furnace unit having an openable and closable ventilation end, the ventilation end including a first ventilation end, the first ventilation ends of the first furnace unit and the second furnace unit being connected through a first pipeline, and a first ventilation port for communicating with the atmosphere being opened on the first pipeline; A temperature adjustment assembly, the temperature adjustment assembly including a heater and a blower, the heater being used for heating the first furnace unit and the second furnace unit, and the blower being connected to the first pipeline and being used for guiding gas to circulate between the first furnace unit and the second furnace unit; The ventilation end further includes a second ventilation end, a ventilation pipe being connected to the second ventilation end, and the heater being connected to the ventilation pipe; the temperature adjustment assembly further includes an induced draft fan, the induced draft fan being connected to the ventilation pipe, and the induced draft fan being used for introducing the heat provided by the heater into the first furnace unit and the second furnace unit; There are two induced draft fans, namely a first induced draft fan and a second induced draft fan, the first induced draft fan being arranged at the second ventilation end of the first furnace unit, and the second induced draft fan being arranged at the second ventilation end of the second furnace unit; The blower includes a first blower and a second blower arranged on the first pipeline, the first blower and the second blower being respectively located on both sides of the first ventilation port, the first blower being close to the first ventilation end of the first furnace unit, and the second blower being close to the first ventilation end of the second furnace unit; The device further includes a controller, and the controller is used for controlling the start-stop and rotation speed of the induced draft fan and the blower; The ventilation end further includes a third ventilation end, the third ventilation ends of the first furnace unit and the second furnace unit being connected through a second pipeline, and a second ventilation port for communicating with the atmosphere being opened on the second pipeline.

2. A temperature regulation method for the regeneration process of a denitration catalyst, characterized in that: This method uses the temperature adjustment device for denitration catalyst regeneration described in claim 1, and includes the following steps: S1. Heating up: Placing the catalyst to be dried in the first furnace unit, closing the first pipeline, heating up the first furnace unit to a preset temperature threshold and maintaining it at this preset temperature threshold for a preset time; S2. Cooling down: Opening the first pipeline to connect the first furnace unit and the second furnace unit, starting the blower arranged on the first pipeline, adjusting the rotation speed of the blower to control the cooling speed in the first furnace unit within a first preset speed range, when the temperature difference between the first furnace unit and the second furnace unit is within a preset temperature difference range, closing the first pipeline, and making the first furnace unit communicate with the atmosphere, and adjusting the rotation speed of the blower to control the cooling speed in the first furnace unit within a second preset speed range, when the temperature in the first furnace unit reaches room temperature, closing the blower, and taking out the processed catalyst; In step S1, while placing the catalyst to be dried in the first furnace unit, placing the catalyst to be dried in the second furnace unit; or first placing the catalyst to be dried in the first furnace unit, and when the first furnace unit has been maintained at this preset temperature threshold for a preset time, then placing the catalyst to be dried in the second furnace unit; After step S2, the following steps are further included: S3. Reheating: Close the first pipeline, heat the second furnace monomer to a preset temperature threshold and maintain it at this preset temperature threshold for a preset time; S4. Re-cooling: Open the first pipeline to connect the first furnace monomer with the second furnace monomer. At the same time, turn on the air blower on the first pipeline and adjust the rotation speed of the air blower to control the cooling rate in the second furnace monomer within the first preset speed range. When the temperature difference between the first furnace monomer and the second furnace monomer is within the preset temperature difference range, close the first pipeline, connect the second furnace monomer with the atmosphere, and adjust the rotation speed of the air blower to control the cooling rate in the second furnace monomer within the second preset speed range. When the temperature in the second furnace monomer reaches room temperature, turn off the air blower and take out the treated catalyst.

3. The temperature regulation method for the denitration catalyst regeneration process according to claim 2, characterized in that The first preset speed is greater than the second preset speed.

4. The temperature regulation method for the denitration catalyst regeneration process according to claim 2, characterized in that The preset temperature difference range is 0 - 10°C.

5. The temperature regulation method for the denitration catalyst regeneration process according to claim 2, characterized in that, In step S1, the heating rate of the first furnace monomer is 3 - 10°C / min; in step S3, the heating rate in the second furnace monomer is 3 - 10°C / min.

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