CN215892422U - Anti-blocking efficient tubular flue gas reheater for SCR denitration temperature rise - Google Patents
Anti-blocking efficient tubular flue gas reheater for SCR denitration temperature rise Download PDFInfo
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- CN215892422U CN215892422U CN202121966821.2U CN202121966821U CN215892422U CN 215892422 U CN215892422 U CN 215892422U CN 202121966821 U CN202121966821 U CN 202121966821U CN 215892422 U CN215892422 U CN 215892422U
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Abstract
The utility model discloses an anti-blocking high-efficiency tubular flue gas reheater for SCR denitration warming, which comprises a shell and a heat exchange tube, wherein the shell is arranged at the periphery of the heat exchange tube, and tube plates are arranged at two ends of the heat exchange tube; the raw flue gas flows in the heat exchange pipe or flows between the shell and the heat exchange pipe, the space where the raw flue gas flows is defined as a raw flue gas cavity, the raw flue gas cavity is divided into more than two independent raw flue gas sub-cavities, the inlet end of each raw flue gas sub-cavity corresponds to a flue gas inlet sub-pipe, and each raw flue gas inlet sub-pipe is provided with a flow regulating device. The device divides the original smoke cavity into more than two independent original smoke sub-cavities, reduces the flow of the original smoke in each original smoke sub-cavity in turn, can realize the temperature increase of the tubular heat exchange element in the area, further leads condensation on the heat exchange element in the area to be gasified, and the adhered fly ash to be loosened and taken out by smoke flow, and achieves the purposes of reducing corrosion and preventing ash blockage; meanwhile, the leakage of the original smoke to the clean smoke side is avoided.
Description
Technical Field
The utility model relates to an anti-blocking efficient tubular flue gas reheater for SCR denitration and temperature rise, and belongs to the technical field of flue gas reheaters.
Background
While the economy of China is rapidly developed, the deep treatment of air pollution is continuously promoted, in recent years, with the transformation of ultralow emission of a thermal power plant, tail sound is entered, the ultralow emission gradually covers a sintering machine in the steel industry, and an SCR denitration system needs to be additionally arranged. The flue gas reheater can effectively carry out heat recovery as important high-efficient indirect heating equipment, promotes the flue gas temperature that gets into the denitration reactor, improves the efficiency of denitration catalyst.
At present, the flue gas reheater for the steel industry is generally of a rotary structure, and at least two problems exist in the application of the rotary flue gas reheater: 1) the rotary flue gas reheater inevitably has dynamic and static gap leakage, the concentration of NOx in the discharged flue gas is increased due to the leakage of the raw flue gas to the clean flue gas side, or the denitration efficiency needs to be improved during operation in order to ensure that the concentration of the NOx in the flue gas is discharged up to the standard, so that the escape rate of the denitration ammonia exceeds the standard; 2) inevitable escape ammonia and SO in the denitrated clean flue gasXReacting ammonium bisulfate, wherein the ammonium bisulfate has a liquid phase in the working temperature range of the flue gas reheater, so that the problems of easy corrosion, ash blockage and the like of a heat storage element of the flue gas reheater are solved.
SUMMERY OF THE UTILITY MODEL
In order to solve the problems of leakage, corrosion, ash blockage and the like of a rotary flue gas reheater in the prior art, the utility model provides an anti-blocking efficient tubular flue gas reheater for SCR denitration and temperature rise.
In order to solve the technical problems, the technical scheme adopted by the utility model is as follows:
an anti-blocking high-efficiency tubular flue gas reheater for SCR denitration and temperature rise comprises a shell and a heat exchange tube, wherein the shell is arranged at the periphery of the heat exchange tube, and tube plates are arranged at two ends of the heat exchange tube; the raw flue gas flows in the heat exchange pipe or flows between the shell and the heat exchange pipe, the space where the raw flue gas flows is defined as a raw flue gas cavity, the raw flue gas cavity is divided into more than two independent raw flue gas sub-cavities, the inlet end of each raw flue gas sub-cavity corresponds to a flue gas inlet sub-pipe, and each raw flue gas inlet sub-pipe is provided with a flow regulating device.
The tubular flue gas reheater is used for countercurrent heat exchange of clean flue gas and raw flue gas, when the raw flue gas flows between the shell and the heat exchange tube, the clean flue gas flows in the heat exchange tube, and when the raw flue gas flows in the heat exchange tube, the clean flue gas flows between the shell and the heat exchange tube. The characteristics of the tubular flue gas reheater which are not particularly limited in the application, such as the arrangement of the inlet and outlet of the original flue gas and the clean flue gas, can be directly referred to the prior art.
The raw flue gas cavity is divided into more than two independent raw flue gas sub-cavities, when the raw flue gas amount in one raw flue gas sub-cavity is adjusted, the temperature of a clean flue gas outlet corresponding to the raw flue gas sub-cavity rises, so that the temperature of the heat exchange element in the area rises, condensation and gasification are realized, and adhered fly ash becomes loose and is brought out by flue gas flow at high temperature, thereby achieving the effects of corrosion resistance and blockage prevention; meanwhile, the leakage of the original smoke to the clean smoke side is avoided.
When raw flue gas flows between the shell and the heat exchange tube, clean flue gas flows in the heat exchange tube, the space between the shell and the heat exchange tube is a raw flue gas cavity, and the space between the shell and the heat exchange tube is divided into more than two independent raw flue gas sub-cavities by the first partition plate. When the raw flue gas amount in one raw flue gas sub-cavity is adjusted to be small, the temperature of a clean flue gas outlet in the heat exchange pipe corresponding to the raw flue gas sub-cavity rises, so that the temperature of the heat exchange element in the area rises, condensation and gasification are realized, and adhered fly ash becomes loose and is carried out by flue gas flow at high temperature.
When raw flue gas flows in the heat exchange tubes, clean flue gas flows between the shell and the heat exchange tubes, the space in all the heat exchange tubes is collected to form a raw flue gas cavity, and the side of the tube plate at the raw flue gas inlet end is divided into more than two independent raw flue gas sub-cavities by the second partition plate. The two ends of the heat exchange tube are provided with tube plates, the tube plates at the two ends are respectively provided with an air inlet and an air outlet corresponding to each heat exchange tube, when raw flue gas flows in the heat exchange tubes, the raw flue gas enters from the tube plate side of the raw flue gas inlet end and then enters each heat exchange tube, the tube plate side of the raw flue gas inlet end is divided into more than two independent raw flue gas sub-cavities by a partition plate, the raw flue gas in each raw flue gas sub-cavity correspondingly enters the heat exchange tube in the area, when the raw flue gas amount in one raw flue gas sub-cavity is adjusted, the raw flue gas amount in the heat exchange tube corresponding to the raw flue gas sub-cavity is reduced, the temperature of a clean flue gas outlet outside the area heat exchange tube is increased, and therefore, the temperature of heat exchange elements in the area is increased, condensation and gasification are realized, and adhered fly ash becomes loose and is brought out by flue gas flow at high temperature.
Further preferably, when the raw flue gas flows in the heat exchange tube, the clean flue gas flows between the shell and the heat exchange tube, the space between the shell and the heat exchange tube is a clean flue gas cavity, the space between the shell and the heat exchange tube is divided into more than two independent clean flue gas sub-cavities by a third partition plate, the third partition plate corresponds to the second partition plate, that is, the third partition plate can be regarded as the extension of the second partition plate to the clean flue gas cavity. Therefore, the flow string of the smoke between the clean smoke sub-cavities can be avoided, when the amount of the original smoke in one original smoke sub-cavity is adjusted, the rising degree of the temperature of the clean smoke outlet outside the regional heat exchange tube can be ensured, and the anti-corrosion and anti-blocking effects are enhanced.
In order to take into account the stifled and heat exchange efficiency, the quantity of former flue gas minute chamber is more than 3. The raw flue gas volume of each raw flue gas sub-cavity can be adjusted to be smaller in turn, so that the heat exchange units can be prevented from being blocked in turn, and when the raw flue gas volume of one raw flue gas sub-cavity is adjusted to be smaller, the raw flue gas volumes of other raw flue gas sub-cavities are increased along with the adjustment of the raw flue gas volume of the other raw flue gas sub-cavities, so that inconvenience of the total raw flue gas volume is ensured, and continuous treatment of the raw flue gas is realized.
The degree of the original smoke volume of each group of heat exchange units can be adjusted to a small degree according to the actual situation on site, and the purpose is to gasify condensation and prevent ash blockage by improving the temperature of clean smoke.
In order to facilitate adjustment and control, the anti-blocking type efficient tubular flue gas reheater for SCR denitration temperature rise further comprises a raw flue gas inlet main pipe, wherein one end of the raw flue gas inlet main pipe is connected with raw flue gas, the other end of the raw flue gas inlet main pipe is branched into more than two paths of raw flue gas inlet branch pipes, the number of the raw flue gas inlet branch pipes is equal to the number of the raw flue gas branch cavities, the raw flue gas inlet branch pipes correspond to the smoke inlet openings of the corresponding raw flue gas branch cavities one by one; each raw flue gas inlet branch pipe is provided with a flow regulating device.
The utility model combines the existing automatic control system and the driving device to realize automatic control.
The prior art is referred to in the art for techniques not mentioned in the present invention.
According to the anti-blocking efficient tubular flue gas reheater for SCR denitration temperature rise, the original flue gas cavity is divided into more than two independent original flue gas sub-cavities, the flow of the original flue gas in each original flue gas sub-cavity is reduced through circulation, the temperature of the tubular heat exchange element in the area is increased, condensation on the heat exchange element in the area is gasified, and adhered fly ash becomes loose and is brought out by the flue gas flow at high temperature, so that the purposes of reducing corrosion and preventing ash blocking are achieved; meanwhile, the leakage of the original smoke to the clean smoke side is avoided.
Drawings
Fig. 1 is a usage state diagram of an anti-blocking type high-efficiency tubular flue gas reheater for SCR denitration and temperature rise in embodiment 1 of the present invention.
In the figure: 1 is a shell, 2 is a heat exchange tube, and 3 is a flow regulating device; 10 is a tubular flue gas reheater, 11 is a raw flue gas cavity, 12 is an SCR denitration device, 20 is a raw flue gas flowing direction, and 21 is a clean flue gas flowing direction.
Detailed Description
In order to better understand the present invention, the following examples are further provided to illustrate the present invention, but the present invention is not limited to the following examples.
Example 1
An anti-blocking high-efficiency tubular flue gas reheater for SCR denitration and temperature rise comprises a shell and a heat exchange tube, wherein the shell is arranged at the periphery of the heat exchange tube, and tube plates are arranged at two ends of the heat exchange tube; the raw flue gas flows in the heat exchange pipe or flows between the shell and the heat exchange pipe, the space where the raw flue gas flows is defined as a raw flue gas cavity, the raw flue gas cavity is divided into more than two independent raw flue gas sub-cavities, the inlet end of each raw flue gas sub-cavity corresponds to a flue gas inlet sub-pipe, and each raw flue gas inlet sub-pipe is provided with a flow regulating device.
When the raw smoke quantity in one raw smoke sub-cavity is adjusted to be small, the temperatures of the inside and the outlet clean smoke gas of the clean smoke gas cavity adjacent to the raw smoke sub-cavity rise, so that the temperature of the heat exchange element in the area rises, condensation and gasification are realized, and adhered fly ash becomes loose and is brought out by smoke gas flow at high temperature, thereby achieving the effects of corrosion prevention and blockage prevention; meanwhile, the leakage of the original smoke to the clean smoke side is avoided.
Example 2
On the basis of the embodiment 1, the following improvements are further made: when raw flue gas flows between the shell and the heat exchange tube, clean flue gas flows in the heat exchange tube, the space between the shell and the heat exchange tube is a raw flue gas cavity, and the space between the shell and the heat exchange tube is divided into three independent raw flue gas sub-cavities by the first partition plate. When the raw flue gas amount in one raw flue gas sub-cavity is adjusted to be small, the temperature of a clean flue gas outlet in the heat exchange pipe corresponding to the raw flue gas sub-cavity rises, so that the temperature of the heat exchange element in the area rises, condensation and gasification are realized, and adhered fly ash becomes loose and is carried out by flue gas flow at high temperature.
Example 3
On the basis of the embodiment 1, the following improvements are further made: when raw flue gas flows in the heat exchange tubes, clean flue gas flows between the shell and the heat exchange tubes, the space in all the heat exchange tubes is collected to form a raw flue gas cavity, and the side of the tube plate at the raw flue gas inlet end is divided into three independent raw flue gas sub-cavities by the second partition plate. The two ends of the heat exchange tube are provided with tube plates, the tube plates at the two ends are respectively provided with an air inlet and an air outlet corresponding to each heat exchange tube, when raw flue gas flows in the heat exchange tubes, the raw flue gas enters from the tube plate side of the raw flue gas inlet end and then enters each heat exchange tube, the tube plate side of the raw flue gas inlet end is divided into three independent raw flue gas sub-cavities by a partition plate, the raw flue gas in each raw flue gas sub-cavity correspondingly enters the heat exchange tube in the area, when the raw flue gas amount in one raw flue gas sub-cavity is adjusted, the raw flue gas amount in the heat exchange tube corresponding to the raw flue gas sub-cavity is reduced, the temperature of a clean flue gas outlet outside the area heat exchange tube is increased, and therefore, the temperature of the area heat exchange elements is increased, condensation and gasification are realized, and adhered fly ash becomes loose and is brought out by flue gas flow under high temperature.
Example 4
On the basis of the embodiment 3, the following improvements are further made: the space between the shell and the heat exchange tube is a purified smoke cavity, the space between the shell and the heat exchange tube is divided into three independent purified smoke sub-cavities by a third partition plate, the third partition plate corresponds to the second partition plate, and the third partition plate can be regarded as the extension of the second partition plate to the purified smoke cavity. Therefore, the flow string of the smoke between the clean smoke sub-cavities can be avoided, when the amount of the original smoke in one original smoke sub-cavity is adjusted, the rising degree of the temperature of the clean smoke outlet outside the regional heat exchange tube can be ensured, and the anti-corrosion and anti-blocking effects are enhanced.
Example 5
On the basis of the embodiment 2, 3 or 4, the following improvements are further made: in order to take into account the stifled and heat exchange efficiency, the quantity that former flue gas divides the cavity is 4. The raw flue gas volume of each raw flue gas sub-cavity can be adjusted to be smaller in turn, so that the heat exchange units can be prevented from being blocked in turn, and when the raw flue gas volume of one raw flue gas sub-cavity is adjusted to be smaller, the raw flue gas volumes of other raw flue gas sub-cavities are increased along with the adjustment of the raw flue gas volume of the other raw flue gas sub-cavities, so that inconvenience of the total raw flue gas volume is ensured, and continuous treatment of the raw flue gas is realized.
Example 6
On the basis of the embodiment 5, the following improvements are further made: in order to facilitate adjustment and control, the anti-blocking type efficient tubular flue gas reheater for SCR denitration heating further comprises a raw flue gas inlet main pipe, wherein one end of the raw flue gas inlet main pipe is connected with raw flue gas, the other end of the raw flue gas inlet main pipe is branched into four paths of raw flue gas inlet branch pipes, the raw flue gas inlet branch pipes correspond to the raw flue gas branch cavities one by one, and the raw flue gas inlet branch pipes are butted at smoke inlets of the corresponding raw flue gas branch cavities; each raw flue gas inlet branch pipe is provided with a flow dividing regulating device. The automatic control can be realized by combining the existing automatic control system and the driving device.
When the device is used, raw flue gas enters a raw flue gas cavity after being dedusted, is heated by clean flue gas, reaches the SCR denitration temperature requirement through afterburning equipment, is subjected to denitration, is used as clean flue gas after denitration, is circularly used for heating the raw flue gas, and enters subsequent treatment processes such as desulfurization and the like after the temperature of the clean flue gas flowing out of a flue gas reheater is reduced by the raw flue gas.
According to the anti-blocking efficient tubular flue gas reheater for SCR denitration temperature rise, the original flue gas cavity is divided into more than two independent original flue gas sub-cavities, the flow of the original flue gas in each original flue gas sub-cavity is reduced through the rotational flow, the temperature of the tubular heat exchange element in the area is increased, condensation on the heat exchange element in the area is gasified, and adhered fly ash becomes loose and is brought out by the flue gas flow at high temperature, so that the purposes of reducing corrosion and preventing ash blocking are achieved; meanwhile, the leakage of the original smoke to the clean smoke side is avoided.
Claims (5)
1. The utility model provides a prevent high-efficient tubular flue gas reheater of stifled type for SCR denitration intensification which characterized in that: the heat exchanger comprises a shell and a heat exchange tube, wherein the shell is arranged on the periphery of the heat exchange tube, and tube plates are arranged at two ends of the heat exchange tube; the raw flue gas flows in the heat exchange pipe or flows between the shell and the heat exchange pipe, the space where the raw flue gas flows is defined as a raw flue gas cavity, the raw flue gas cavity is divided into more than two independent raw flue gas sub-cavities, the inlet end of each raw flue gas sub-cavity corresponds to a flue gas inlet sub-pipe, and each raw flue gas inlet sub-pipe is provided with a flow regulating device.
2. The anti-blocking type efficient tubular flue gas reheater for SCR denitration temperature rise of claim 1, characterized in that: when raw flue gas flows between the shell and the heat exchange tube, clean flue gas flows in the heat exchange tube, the space between the shell and the heat exchange tube is a raw flue gas cavity, and the space between the shell and the heat exchange tube is divided into more than two independent raw flue gas sub-cavities by the first partition plate; when raw flue gas flows in the heat exchange tubes, clean flue gas flows between the shell and the heat exchange tubes, the space in all the heat exchange tubes is collected to form a raw flue gas cavity, and the side of the tube plate at the raw flue gas inlet end is divided into more than two independent raw flue gas sub-cavities by the second partition plate.
3. The anti-blocking type efficient tubular flue gas reheater for SCR denitration temperature rise of claim 2, characterized in that: when the original flue gas flows in the heat exchange tube, the clean flue gas flows between the shell and the heat exchange tube, the space between the shell and the heat exchange tube is a clean flue gas cavity, the space between the shell and the heat exchange tube is divided into more than two independent clean flue gas sub-cavities by a third partition plate, and the third partition plate corresponds to the second partition plate.
4. The anti-blocking type efficient tubular flue gas reheater for SCR denitration temperature rise as recited in any one of claims 1 to 3, wherein: the number of the original smoke sub-cavities is more than 3.
5. The anti-blocking type efficient tubular flue gas reheater for SCR denitration temperature rise as recited in any one of claims 1 to 3, wherein: the system also comprises a raw flue gas inlet main pipe, wherein one end of the raw flue gas inlet main pipe is connected with raw flue gas, the other end of the raw flue gas inlet main pipe is branched into more than two paths of raw flue gas inlet branch pipes, the number of the raw flue gas inlet branch pipes is equal to that of the raw flue gas branch cavities, the raw flue gas inlet branch pipes correspond to the raw flue gas inlet branch cavities one by one, and the raw flue gas inlet branch pipes are butted with the flue gas inlet ports of the corresponding raw flue gas branch cavities; each raw flue gas inlet branch pipe is provided with a flow regulating device.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121966821.2U CN215892422U (en) | 2021-08-20 | 2021-08-20 | Anti-blocking efficient tubular flue gas reheater for SCR denitration temperature rise |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121966821.2U CN215892422U (en) | 2021-08-20 | 2021-08-20 | Anti-blocking efficient tubular flue gas reheater for SCR denitration temperature rise |
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| CN215892422U true CN215892422U (en) | 2022-02-22 |
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| CN202121966821.2U Active CN215892422U (en) | 2021-08-20 | 2021-08-20 | Anti-blocking efficient tubular flue gas reheater for SCR denitration temperature rise |
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