CN215087006U - Stable cooling system of control after catalyst regeneration is dry or calcination - Google Patents
Stable cooling system of control after catalyst regeneration is dry or calcination Download PDFInfo
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- CN215087006U CN215087006U CN202022671365.0U CN202022671365U CN215087006U CN 215087006 U CN215087006 U CN 215087006U CN 202022671365 U CN202022671365 U CN 202022671365U CN 215087006 U CN215087006 U CN 215087006U
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Abstract
The utility model provides a control stable cooling system after catalyst regeneration drying or calcination, which can save drying and calcination equipment resources, stably control the slow cooling of the dried or calcined catalyst, and ensure that the mechanical strength of the regenerated catalyst finished product is not damaged and reduced due to the cooling process; the cooling box of the cooling device comprises an air inlet, an air outlet, a first air channel, a second air channel and a third air channel, wherein a cavity for accommodating a catalyst in the cooling box is communicated with the first air channel, the second air channel and the third air channel to form a three-way structure, the air inlet is communicated with the first air channel and the second air channel to form a three-way structure, the second air channel is connected with a circulating fan, the air inlet end is connected with an air inlet control valve, the third air channel is connected with an exhaust draught fan, air flowing through a catalyst pore channel is discharged to the outside through the air outlet, a thermocouple assembly comprises a plurality of thermocouples which are respectively inserted into the pore channel of the catalyst, a flow equalizing grid is arranged in the cavity above the catalyst, and the exhaust draught fan, the air inlet control valve, the circulating fan and the thermocouples are all connected to a control system.
Description
Technical Field
The utility model relates to an environmental protection technology field specifically is a cooling system is stabilized in catalyst regeneration drying or calcination back control.
Background
At present, most of boiler and kiln equipment are provided with SCR denitration devices, SCR catalysts are core components of the SCR denitration devices, the SCR catalysts are relatively harsh in operation conditions and can be deactivated under the action of various factors after being operated for a certain time, regeneration is a scheme for treating deactivated catalysts which is generally selected, and proper treatment can effectively recover the denitration performance of the catalysts; the regeneration generally adopts a wet cleaning method, and the regenerated catalyst needs to be subjected to a drying and roasting process, so that an active substance precursor loaded in the catalyst is decomposed, the mechanical strength of the catalyst is recovered, and the like. At present, a drying and roasting process is widely adopted in regeneration production, a catalyst is heated to 100 ℃ to 400 ℃ through drying equipment, but because the catalyst is a ceramic material, the catalyst heated to high temperature needs to be slowly cooled, otherwise, the catalyst can crack due to internal stress, or the existing cracking is further aggravated in use, and the drying equipment accounts for a higher proportion in the cost of regeneration factory equipment, so that a key link for restricting the whole capacity is realized, therefore, the controllable slow cooling of the catalyst cannot be ensured in the current production, and the adverse effect on a catalyst finished product can be generated.
In addition, the existing regenerative drying roasting equipment mainly comprises a tunnel type and a fixed type, but the special consideration of temperature reduction requirement is not found in the fixed type design and manufacture; although the tunnel type drying and roasting equipment is provided with the cooling section, the measurement and control of the cooling process are rough, only simple temperature measuring points are arranged in the equipment space, and the temperature in the catalyst pore channel cannot be accurately measured, so that the cooling of the catalyst cannot be further accurately controlled, and the productivity of the tunnel type drying and roasting equipment can be reduced due to the overlong cooling section.
In view of this, practical production demands the cooling after the drying or firing procedure as follows:
(1) the capacity of the existing drying and roasting equipment is not occupied;
(2) the temperature of the catalyst can be tested in the catalyst pore channel;
(3) the cooling process is controllable, accurate control is implemented according to test feedback, and the cooling rate is guaranteed to be within a set range.
However, no device and method for controlling stable temperature reduction after the catalyst regeneration drying or roasting procedure capable of realizing the requirements are available at present.
In view of the above, it is particularly necessary and important to develop a separate apparatus and method capable of precisely controlling the stable temperature reduction of the dried and calcined catalyst.
Disclosure of Invention
In view of the above problem, the utility model provides a cooling system is stabilized in control after catalyst regeneration drying or calcination, the equipment principle of its adoption is simple, and measurement and control are reliable, not only can save dry calcination equipment resource, and can control the slow cooling of catalyst of accomplishing drying or calcination steadily, guarantees that the off-the-shelf mechanical strength of regenerated catalyst does not reduce because of the cooling process is impaired.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
the utility model provides a stable cooling system of control after catalyst regeneration is dried or calcination which characterized in that: the cooling device comprises a cooling device, a thermocouple assembly and a control system, wherein the cooling device comprises a cooling box, the cooling box comprises an air inlet, an air outlet, a first air duct, a second air duct and a third air duct, a containing cavity for containing a catalyst is arranged in the cooling box, the containing cavity is communicated with the first air duct, the second air duct and the third air duct to form a three-way structure, the air inlet is communicated with the first air duct and the second air duct to form a three-way structure, the second air duct is connected with a circulating fan, the air inlet end is connected with an air inlet control valve, the third air duct is connected with an exhaust draught fan, air flowing through the catalyst pore is discharged to the outside through the air outlet, the thermocouple assembly comprises a plurality of thermocouples and is respectively inserted in the pore of the catalyst, and a flow equalizing grid is arranged in the containing cavity above the catalyst, and the exhaust induced draft fan, the air inlet control valve, the circulating fan and the thermocouple are all connected to the control system.
It is further characterized in that:
the thermocouple assembly further comprises a fixing clamp, mounting holes are formed in the fixing clamp, the thermocouples respectively penetrate through the mounting holes and are fixed on the fixing clamp through butterfly bolts screwed into the mounting holes, and the fixing clamp is mounted on the inner wall of the containing cavity above the catalyst;
the upper part of the extending end of each thermocouple is provided with two continuous bending parts which are divided into a first bending part and a second bending part;
the length of each thermocouple extending end is different, so that the placement heights of the thermocouples placed in the catalyst pore channels are different;
the distance between the measuring point of the thermocouple which is arranged in the catalyst pore channel and has the highest placing height and the top end surface of the catalyst is 0-200 mm, the distance between the measuring point of the thermocouple which is arranged in the catalyst pore channel and has the lowest placing height and the bottom end surface of the catalyst is 100-500 mm, and the measuring points of other thermocouples are uniformly distributed in the catalyst pore channel which is positioned between the highest placing height and the lowest placing height.
The beneficial effects of the utility model are that, the cooling system principle that it used is simple, measurement and control are reliable, can obtain the temperature distribution and the cooling rate of the different positions of catalyst, and according to temperature distribution and cooling rate, through control system control circulation amount of wind, the amount of wind of discharge cooling system and the amount of wind of introducing cooling system, thereby make the catalyst that still is in higher temperature of accomplishing drying or calcination technology with controlled, stable cooling rate cooling, and each position temperature is even, and avoid the mechanical strength lowering conditions such as catalyst fracture that stress caused as far as possible, better economic use value has.
Drawings
Fig. 1 is a schematic structural diagram of the present invention;
FIG. 2 is a schematic structural view of a thermocouple assembly according to the present invention;
fig. 3 is a control flow chart in the present invention.
Detailed Description
As shown in fig. 1, fig. 2 and fig. 3, the present invention relates to a system for controlling and stabilizing cooling after drying or calcining catalyst, which blows air from a circulating fan 2 to a duct of a catalyst 3 through a top port of a cooling box 1 to drive air to flow, so that the temperature is uniform, and is provided with an exhaust draught fan 4 capable of controlling the amount of exhausted air, so as to control the cooling rate, and is provided with a thermocouple assembly 5, wherein a thermocouple 13 is inserted into the duct of the catalyst 3 to measure the temperature in the duct, so as to control the amount of exhausted air, specifically, the system comprises a cooling device, a thermocouple assembly 5 and a control system (not shown in the figure), the cooling device comprises a cooling box 1, the cooling box 1 comprises an air inlet 6, an air outlet 7, a first air duct 8, a second air duct 9 and a third air duct 10, specifically, the first air duct 8 is communicated with a left port of the cooling box 1, the second air duct 9 is communicated with the top port of the cooling box 1, and the third air duct 10 is communicated with the right port of the cooling box 1; the cooling box 1 is internally provided with a cavity 11 for containing the catalyst 3, the cavity 11 is communicated with a first air duct 8, a second air duct 9 and a third air duct 10 to form a three-way structure, an air inlet 6 is communicated with the first air duct 8 and the second air duct 9 to form a three-way structure, the second air duct 9 is connected with a circulating fan 2, the end of the air inlet 6 is connected with an air inlet control valve 12, the third air duct 10 is connected with an exhaust induced draft fan 4, air flowing through the pore channel of the catalyst 3 is exhausted to the outside through an exhaust port 7, a thermocouple assembly 5 comprises 3 thermocouples 13 which are respectively inserted into the pore channel of the catalyst 3, a flow equalizing grid 14 is arranged in the cavity 11 above the catalyst 3, the incoming air can be uniformly mixed, the uneven cooling and flow equalizing of the catalyst 3 caused by the uneven flue gas flow and flue gas temperature at different positions can be avoided, the grid 14 is composed of two independent grids, each individual grid is a square outer frame; the exhaust induced draft fan 4, the air inlet control valve 12, the circulating fan 2 and the thermocouple 13 are all connected to a control system, the control system can collect the temperatures of different pore passages and different positions of the catalyst 3 obtained by testing of the thermocouple 13, the uniformity of the uniform time temperature of the catalyst 3 can be obtained, and the cooling rate of the catalyst 3 can be obtained by comparing the temperatures at different times.
The utility model discloses a catalyst 3 regeneration is dry or stable cooling system of control after calcination, through 3 wind paths that are equipped with first wind channel 8, second wind channel 9, third wind channel 10, and the wind path is shown as the arrow in figure 1, circulating fan 2 guides the air to flow in cooling box 1, after the air flows through catalyst 3, the temperature can rise, some air is discharged outside cooling box 1 under the effect of exhaust draught fan 4, some air reenters the circulation, before entering circulating fan 2, some outside cool air can be introduced cooling box 1, thereby reduce the temperature of the interior circulating air of cooling box 1; wherein, the circulating fan 2 blows air to circulate continuously, thereby promoting the temperature of each point to be uniform; the exhaust draught fan 4 guides a certain amount of air to be exhausted, so that part of external cold air is allowed to enter and circulate, and the uniform and gradual reduction of the temperature of each catalyst 3 and each position of each catalyst 3 can be realized under the cooperation of the three air paths.
The thermocouple assembly 5 further comprises a fixing clamp 15, mounting holes 16 are formed in the fixing clamp 15, the thermocouples 13 penetrate through the mounting holes 16 respectively and are fixed on the fixing clamp 15 through butterfly bolts screwed into the mounting holes 16, and the fixing clamp 15 is mounted on the inner wall of the containing cavity 11 above the catalyst 3; the length of the extending end of each thermocouple 13 is different, so that the placement heights of the thermocouples 13 placed in the pore channels of the catalyst 3 are different; each thermocouple 13 can be adjusted left and right within a small range on the fixing clamp 15 so as to adapt to the relative position of the catalyst 3 in the cooling box 1, the thermocouple 13 can also be pulled up and down so as to adjust different heights, and after the left and right relative positions are adjusted, a butterfly bolt is screwed into the mounting hole 16 according to the position of the butterfly bolt, so that the thermocouple 13 is fixed; the upper part of the extending end of each thermocouple 13 is provided with two continuous bending parts which are divided into a first bending part 17 and a second bending part 18, so that after the thermocouple 13 is inserted into the pore channel of the catalyst 3, the tested pore channel can not be shielded by the fixing clamp 15 of the thermocouple 13 to influence the gas circulation due to the effects of the first bending part 17 and the second bending part 18, and the temperature in the pore channel of the catalyst 3 is basically consistent with the pore channel without the thermocouple 13.
The distance between the measuring point of the thermocouple 13 which is arranged in the pore channel of the catalyst 3 and has the highest placing height and the top end face of the catalyst 3 is 0-200 mm, namely the distance between the measuring point of the thermocouple 13 with the shortest length of the extending end and the top end face of the catalyst 3 is 0-200 mm; the distance between the measuring point of the thermocouple 13 which is arranged in the pore canal of the catalyst 3 and has the lowest height and the bottom end surface of the catalyst 3 is 100 mm-500 mm, namely the distance between the measuring point of the thermocouple 13 with the longest length of the extending end and the bottom end surface of the catalyst 3 is 100 mm-500 mm; the measuring points of the other thermocouples 13 are uniformly arranged in the channels of the catalyst 3 between the highest and the lowest placement level.
A method for controlling stable temperature reduction after regeneration drying or roasting of a catalyst 3 comprises the following steps:
s1, after the catalyst 3 is dried or roasted, and before the temperature is reduced, the left and right positions of the thermocouples 13 on the fixing clamp 15 are adjusted according to the specific conditions of the catalyst 3, each thermocouple 13 is placed close to the edge or corner of the inner wall of the catalyst 3 as much as possible, the height position of the thermocouple 13 in the pore passage of the catalyst 3 is adjusted according to the height of the catalyst 3, and after the height position of the thermocouple 13 is adjusted, the relative position of the thermocouple 13 and the catalyst 3 is fixed;
s2, then feeding the catalyst 3 into the cavity 11, and closing the cooling box 1;
s3, starting the circulating fan 2 to enable air to start circulating flow in the cooling box 1;
s4, the control system collects the temperatures of the thermocouple 13 at different positions of different pore channels of the catalyst 3 so as to control the cooling rate of the catalyst 3 and the uniformity of the temperature of the catalyst 3 in real time;
specifically, the control system controls in real time to obtain a suitable cooling rate of the catalyst 3, and the specific steps are as follows: when the temperature deviation of different pore passages of the catalyst 3 at different positions is overlarge, the control system controls the circulating fan 2 to increase the circulating air quantity until the temperature deviation is reduced;
after the cooling rate of the catalyst 3 is obtained, if the cooling rate is too slow, the control system controls the exhaust induced draft fan 4 to increase the discharge amount, so that cold air enters the cavity 11 to accelerate the cooling rate; if the cooling rate is too fast, the control system controls the exhaust draught fan 4 to reduce the discharge so as to slow down the cooling rate;
wherein the cooling rate is controlled to be 1-20 ℃/min, and the cooling rate is mainly controlled according to the property of the catalyst 3.
S5, after the temperature of the catalyst 3 is reduced to the ambient temperature, the catalyst 3 is removed from the cooling box 1.
The utility model is provided with the cooling device, can test the internal temperature of the pore canal of the catalyst 3 to obtain the temperature distribution and the cooling rate of different positions of the catalyst 3, and according to the temperature distribution and the cooling rate, the control system controls the circulating air quantity, the air quantity of the exhaust system and the cool air quantity of the introduction system, the method for controlling and stably cooling the regenerated, dried or roasted catalyst 3 of the utility model has the advantages of simple principle, reliable measurement and control, saving of drying and roasting equipment resources, stable control of slowly cooling the dried or roasted catalyst 3, i.e. the catalyst 3 module which is still at a higher temperature after completion of the drying or calcination process can be cooled down at a controlled and stable cooling rate, and the temperature at each position is uniform, so that the condition of mechanical strength reduction such as cracking of the catalyst 3 caused by stress is avoided as much as possible.
To sum up, the utility model discloses a description is verified to specific embodiment:
the catalyst 3 was composed of 6X 12 unit cells each having 18X 18 holes and each having a length of 800 mm.
After the existing catalyst 3 is dried at 120 ℃, the existing catalyst is directly pulled out of a drying device, the cracking sound of the catalyst 3 caused by stress due to the too fast temperature reduction can be heard, and after the catalyst 3 is cooled to room temperature, cracks can be seen on the inner wall of part of the catalyst 3, the mechanical strength of the catalyst 3 is tested by the existing method, namely the axial compressive strength and the radial compressive strength are respectively 1.86MPa and 0.41MPa, and the mechanical strength is obviously lower than the requirement of the standard in the industry.
And adopt the utility model discloses a cooling system and cooling method after:
catalyst 3 again consisted of 6 x 12 unit cells, each cell having 18 x 18 holes and each cell having a length of 800 mm.
3 temperature measuring points are arranged, namely 3 thermocouples 13 are arranged and are respectively positioned in the pore canals of the 3 unit bodies, and the heights of the measuring points of the 3 thermocouples 13 are respectively 100mm away from the top end face of the catalyst 3, 300mm away from the top end face of the catalyst 3 and 500mm away from the top end face of the catalyst 3;
the temperature of the dried catalyst 3 is 120 ℃, and the room temperature is 20 ℃;
under the control of a control system, the temperature difference of the three measuring points is controlled within 3 ℃, the cooling rate is set to be 5 ℃/min according to the characteristics of the project catalyst 3 in a temperature range of 60-120 ℃, and the cooling is finished within 12 min; and in the temperature range of 20-60 ℃, the cooling rate is set to be about 2 ℃/min, and the cooling is finished within 20 min.
The final catalyst 3 finished product does not find cracks on the inner wall, the mechanical strength is still tested by the existing method, the axial compressive strength and the radial compressive strength are respectively 2.19MPa and 0.82MPa, the technical requirements of the regenerated catalyst 3 are met, and the method is superior to the existing catalyst 3 cooling method.
It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (5)
1. The utility model provides a stable cooling system of control after catalyst regeneration is dried or calcination which characterized in that: the cooling device comprises a cooling device, a thermocouple assembly and a control system, wherein the cooling device comprises a cooling box, the cooling box comprises an air inlet, an air outlet, a first air duct, a second air duct and a third air duct, a containing cavity for containing a catalyst is arranged in the cooling box, the containing cavity is communicated with the first air duct, the second air duct and the third air duct to form a three-way structure, the air inlet is communicated with the first air duct and the second air duct to form a three-way structure, the second air duct is connected with a circulating fan, the air inlet end is connected with an air inlet control valve, the third air duct is connected with an exhaust draught fan, air flowing through the catalyst pore is discharged to the outside through the air outlet, the thermocouple assembly comprises a plurality of thermocouples and is respectively inserted in the pore of the catalyst, and a flow equalizing grid is arranged in the containing cavity above the catalyst, and the exhaust induced draft fan, the air inlet control valve, the circulating fan and the thermocouple are all connected to the control system.
2. The system for controlling the temperature of the catalyst to be stably reduced after the catalyst is regenerated, dried or roasted according to claim 1, wherein: the thermocouple assembly further comprises a fixing clamp, mounting holes are formed in the fixing clamp, the thermocouples penetrate through the mounting holes respectively and are fixed on the fixing clamp through butterfly bolts screwed into the mounting holes, and the fixing clamp is mounted on the inner wall of the containing cavity above the catalyst.
3. The system for controlling the temperature of the catalyst to be stably reduced after the catalyst is regenerated, dried or roasted according to claim 1, wherein: the upper part of the extending end of each thermocouple is provided with two continuous bending parts which are divided into a first bending part and a second bending part.
4. The system for controlling the temperature of the catalyst to be stably reduced after the catalyst is regenerated, dried or roasted according to claim 1, wherein: the length of each thermocouple extending end is different, so that the placement height of the thermocouples placed in the catalyst pore channels is different.
5. The system for controlling the temperature of the catalyst to be stably reduced after the catalyst is regenerated, dried or roasted according to claim 1, wherein: the distance between the measuring point of the thermocouple which is arranged in the catalyst pore channel and has the highest placing height and the top end surface of the catalyst is 0-200 mm, the distance between the measuring point of the thermocouple which is arranged in the catalyst pore channel and has the lowest placing height and the bottom end surface of the catalyst is 100-500 mm, and the measuring points of other thermocouples are uniformly distributed in the catalyst pore channel which is positioned between the highest placing height and the lowest placing height.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202022671365.0U CN215087006U (en) | 2020-11-18 | 2020-11-18 | Stable cooling system of control after catalyst regeneration is dry or calcination |
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| CN202022671365.0U CN215087006U (en) | 2020-11-18 | 2020-11-18 | Stable cooling system of control after catalyst regeneration is dry or calcination |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112588216A (en) * | 2020-11-18 | 2021-04-02 | 苏州西热节能环保技术有限公司 | System and method for controlling and stabilizing temperature reduction after catalyst regeneration drying or roasting |
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2020
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112588216A (en) * | 2020-11-18 | 2021-04-02 | 苏州西热节能环保技术有限公司 | System and method for controlling and stabilizing temperature reduction after catalyst regeneration drying or roasting |
| CN112588216B (en) * | 2020-11-18 | 2023-11-10 | 苏州西热节能环保技术有限公司 | System and method for controlling stable cooling after catalyst regeneration drying or roasting |
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