CN215027441U - Flue gas cooling system for industrial flue gas active coke desulfurization and denitrification process - Google Patents
Flue gas cooling system for industrial flue gas active coke desulfurization and denitrification process Download PDFInfo
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- CN215027441U CN215027441U CN202120531645.3U CN202120531645U CN215027441U CN 215027441 U CN215027441 U CN 215027441U CN 202120531645 U CN202120531645 U CN 202120531645U CN 215027441 U CN215027441 U CN 215027441U
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- desulfurization
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- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 86
- 239000003546 flue gas Substances 0.000 title claims abstract description 86
- 238000001816 cooling Methods 0.000 title claims abstract description 35
- 239000000571 coke Substances 0.000 title claims description 27
- 238000000034 method Methods 0.000 title claims description 21
- 230000008569 process Effects 0.000 title claims description 21
- 238000006477 desulfuration reaction Methods 0.000 title claims description 17
- 230000023556 desulfurization Effects 0.000 title claims description 17
- 238000001179 sorption measurement Methods 0.000 claims abstract description 16
- 239000002918 waste heat Substances 0.000 claims abstract description 6
- 230000005484 gravity Effects 0.000 claims description 15
- 229910000975 Carbon steel Inorganic materials 0.000 claims description 6
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- 238000007747 plating Methods 0.000 claims description 2
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- 238000006243 chemical reaction Methods 0.000 claims 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 20
- 230000007797 corrosion Effects 0.000 abstract description 11
- 238000005260 corrosion Methods 0.000 abstract description 11
- 238000005516 engineering process Methods 0.000 abstract description 7
- 230000008901 benefit Effects 0.000 abstract description 5
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- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 101100204059 Caenorhabditis elegans trap-2 gene Proteins 0.000 description 2
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Abstract
The utility model discloses a flue gas cooling system for active burnt SOx/NOx control technology of industrial flue gas, including the heat exchanger, the heat source inlet pipe connection of heat exchanger is to industrial flue gas pipeline, heat source outlet pipe connection is to active burnt SOx/NOx control adsorption tower, cold source inlet pipe connection is to the cooling air-blower, the direct evacuation of cold source outlet pipe way or be connected to the waste heat utilization pipeline, be equipped with the high temperature defroster on the heat source inlet pipe way, high temperature defroster bottom sets up the high temperature trap, be equipped with low temperature defroster and low temperature trap on the heat source outlet pipe way, the low temperature trap is located the lower of heat source outlet pipe way. The system cools the industrial flue gas through normal temperature air and removes water in the industrial flue gas, and has the advantages of high wall temperature, good corrosion resistance, simplicity, stability and long service life.
Description
Technical Field
The utility model belongs to industry flue gas cooling field, concretely relates to flue gas cooling system that is used for active burnt SOx/NOx control technology of industry flue gas.
Background
Compared with the traditional wet desulphurization process, the integrated desulphurization efficiency of the activated coke desulphurization and denitration is higher, the dry process saves water, the denitration is realized while the desulphurization, the comprehensive operation cost is lower, and the environmental protection benefit is better. DL/T1657 and 2016 active coke dry desulphurization technical specification require that the temperature of the flue gas at the inlet of the active coke adsorption tower is not more than 150 ℃, otherwise, because the heat release speed of the active coke oxidation is high, each adsorption unit in the adsorption tower continuously stores heat to cause the temperature to be continuously raised, and finally, the temperature of the adsorption tower is out of control, so that the active coke is burnt out and even the safety problem of spontaneous combustion of the active coke in the adsorption tower is brought. Therefore, the primary process of the industrial flue gas active coke desulfurization and denitrification process is to reduce the temperature of the flue gas at the inlet of the active coke adsorption tower, and is generally designed to be 120 ℃.
The currently common measures for reducing the temperature of the flue gas at the inlet of the active coke adsorption tower in the industry mainly comprise the following three measures and all have defects:
1) water spray cooling, namely spraying atomized water into a flue through a water spray nozzle to mix with flue gas, and reducing the temperature of the flue gas by utilizing phase change heat absorption of the water. The process has the first disadvantage that when the temperature of the flue gas is lower, the sprayed water is not easy to be rapidly gasified, so that fog drops are still in a liquid state after reaching the inner wall of the flue, and meanwhile, partial steam is condensed on the wall surface to cause serious corrosion to the flue and downstream equipment; moreover, the water content in the flue gas is further increased after water is sprayed, the performance of the active coke can be influenced, and the denitration efficiency is reduced; in addition, the ejected water is difficult to recycle, and the water consumption is relatively large.
2) And (2) cold air charging and cooling, namely a cold air charging channel and an adjusting valve are arranged on the flue, and air at normal temperature in the atmosphere is fed into the flue to be mixed with the original flue gas, so that the operation is convenient, the process is simple, and the control is easy. The process has the disadvantages that the specific heat of the air and the flue gas is close, the air quantity needing to be mixed is higher, and the load of downstream equipment is increased; after the air is mixed, the oxygen content of the flue gas is increased, so that the final emission concentration of pollutants converted into the standard oxygen content is relatively increased, and the requirements on the activated coke desulfurization and denitrification facilities are higher; the oxygen content of the flue gas is increased, the oxidation temperature rise of the active coke in the adsorption tower is accelerated, and the safe operation of the adsorption tower is influenced.
3) The flue gas-water cooler is characterized by that on the flue a finned tube heat exchanger is set, the flue gas can be transversely washed from outside to make the finned tube flow through the flue tube to cool the flue gas. The process has the defects of high water consumption, low wall temperature of the finned tube, easy dew point corrosion and short service life; in addition, after the water leakage of the finned tube, the unit needs to be stopped as early as possible, otherwise the whole cooler and the flue are seriously corroded.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a flue gas cooling system for active burnt SOx/NOx control technology of industry flue gas, this system cools off the moisture of getting rid of in the industry flue gas simultaneously through normal atmospheric temperature air to the industry flue gas, and wall temperature is high, and corrosion resisting property is good, and is simple stable, long service life.
The utility model adopts the technical proposal that:
the utility model provides a flue gas cooling system for active burnt SOx/NOx control technology of industrial flue gas, including the heat exchanger, the heat source inlet pipe of heat exchanger is connected to industrial flue gas pipeline, heat source outlet pipe is connected to active burnt SOx/NOx control adsorption tower, cold source inlet pipe is connected to the cooling blower, the direct evacuation of cold source outlet pipe or be connected to the waste heat utilization pipeline, be equipped with the high temperature defroster on the heat source inlet pipe, high temperature defroster bottom sets up the high temperature trap, be equipped with low temperature defroster and low temperature trap on the heat source outlet pipe, the low temperature trap is located the minimum of heat source outlet pipe.
As an improvement of the utility model, the heat exchanger adopts the parallelly connected heat exchange module of multiunit.
Furthermore, each group of heat exchange modules adopts a plurality of independent gravity type heat pipes as heat exchange elements.
Furthermore, the gravity type heat pipe smoke side material is carbon steel enamel plating, 316L stainless steel or 2205 duplex stainless steel.
Furthermore, the material of the air side of the gravity type heat pipe is carbon steel.
As an improvement of the utility model, the bottom of the heat exchanger is provided with an ash bucket.
As an improvement of the utility model, the high-temperature demister and the low-temperature demister all adopt corrugated plate structures.
As an improvement of the utility model, the cooling blower adopts the variable frequency speed regulation.
As an improvement of the utility model, the heat source inlet and outlet pipeline and the cold source inlet and outlet pipeline of the heat exchanger are arranged in a countercurrent mode, and the flow direction of industrial flue gas and air is opposite.
As another kind of improvement of the utility model, the heat source of heat exchanger is imported and exported pipeline and cold source and is imported and exported the pipeline following current and arrange, and industry flue gas and air flow direction are the same.
The utility model has the advantages that:
during operation, the industrial flue gas that the temperature is T1 firstly passes through the preliminary dewatering of high temperature defroster and in time gets rid of the comdenstion water by high temperature trap, reduce the corruption of industrial flue gas to the heat exchanger, then get into the heat exchanger and carry out the heat transfer cooling, the industrial flue gas that reaches technology requirement temperature T2 passes through the low temperature defroster once more and removes the comdenstion water by low temperature trap in time, further get rid of and reach saturated vapor because of the industrial flue gas temperature reduces, finally get into active burnt SOx/NOx control adsorption tower, simultaneously, the cold air that the temperature is T3 gets into the heat exchanger through cooling blower and carries out the heat transfer intensification, the temperature rises behind T4, direct evacuation or as dry hot-blast waste heat utilization. The system cools the industrial flue gas through normal temperature air and removes water in the industrial flue gas, and has the advantages of high wall temperature, good corrosion resistance, simplicity, stability and long service life.
Drawings
Fig. 1 is a schematic diagram (counter-current arrangement) of a flue gas cooling system for an industrial flue gas active coke desulfurization and denitrification process in the utility model.
Fig. 2 is a schematic diagram (downstream arrangement) of a flue gas cooling system for an industrial flue gas active coke desulfurization and denitrification process in the utility model.
In the figure: 1-a high temperature demister; 2-high temperature drain valve; 3-a heat exchanger; 4-low temperature drain valve; 5-a low-temperature demister; 6-cooling the blower; 7-ash bucket; 8-gravity type heat pipe.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and examples.
As shown in fig. 1 and fig. 2, a flue gas cooling system for active burnt SOx/NOx control technology of industrial flue gas includes heat exchanger 3, heat source inlet pipe of heat exchanger 3 is connected to industrial flue gas pipeline, heat source outlet pipe is connected to active burnt SOx/NOx control adsorption tower, cold source inlet pipe is connected to cooling blower 6, the direct evacuation of cold source outlet pipe or be connected to the waste heat utilization pipeline, be equipped with high temperature defroster 1 on the heat source inlet pipe, high temperature defroster 1 bottom sets up high temperature trap 2, be equipped with low temperature defroster 5 and low temperature trap 4 on the heat source outlet pipe, low temperature trap 4 is located the lowest of heat source outlet pipe. During operation, the industrial flue gas that the temperature is T1 firstly passes through high temperature defroster 1 preliminary dewatering and in time gets rid of the comdenstion water by high temperature trap 2, reduce the corruption of industrial flue gas to heat exchanger 3, then it carries out the heat transfer cooling to get into heat exchanger 3, the industrial flue gas that reaches technology requirement temperature T2 passes through low temperature defroster 5 and removes the comdenstion water in time by low temperature trap 4 again, further get rid of and reach saturated vapor because of industrial flue gas temperature reduces, finally get into active burnt SOx/NOx control adsorption tower, simultaneously, the cold air that the temperature is T3 gets into heat exchanger 3 through cooling blower 6 and carries out the heat transfer and heat-rise, after the temperature rose to T4, directly the evacuation or as dry hot-blast waste heat utilization.
In this embodiment, the heat exchanger 3 adopts the parallelly connected heat exchange module of multiunit, and the installation and the change of being convenient for, partial heat exchange module damage does not influence whole normal operating, need not to shut down the machine and stop production.
As shown in fig. 1 and fig. 2, in this embodiment, each group of heat exchange modules uses a plurality of independent gravity heat pipes 8 as heat exchange elements. The lower end (namely the heated section) of the gravity type heat pipe 8 absorbs the heat of the industrial flue gas and transfers the heat to the working medium in the pipe, the working medium absorbs the heat and is converted into steam in a form of evaporation and boiling, the steam rises to the upper end (namely the heat release section) of the gravity type heat pipe 8 under the action of pressure difference and is condensed into liquid, the latent heat of condensation is released, the heat is transferred to cold air of the heat release section, the condensate returns to the heated section along the inner wall of the pipe under the action of gravity and is heated and vaporized again, and the steps are repeated in such a circulating way, and the heat is continuously transferred to the air from the industrial flue gas. By adjusting the number of the gravity type heat pipes 8 and/or the heat transfer area ratio of the cold side and the hot side, the wall temperature can be increased to be higher than the dew point temperature, and the dew point corrosion can be effectively prevented; because each gravity type heat pipe 8 is an independent closed unit, part of the gravity type heat pipes 8 are damaged, the whole normal operation is not influenced, and the shutdown and production halt are not needed.
In this embodiment, the gravity type heat pipe 8 is made of carbon steel enamel, 316L stainless steel or 2205 duplex stainless steel, so as to further prevent dew point corrosion; the material of the air side of the gravity type heat pipe 8 is carbon steel, so that the cost of the equipment is reduced.
As shown in fig. 1 and fig. 2, in the present embodiment, an ash hopper 7 is disposed at the bottom of the heat exchanger 3, and can collect large particle dust sinking due to the industrial flue gas scouring the fins of the heat exchanger 3.
As shown in fig. 1 and 2, in the present embodiment, the high-temperature demister 1 and the low-temperature demister 5 both have a corrugated plate structure, and have small resistance and are not easily clogged.
In the present embodiment, the cooling blower 6 is variable-frequency speed-controlled. The cooling blower 6 can adjust the rotating speed in time according to the flow and temperature fluctuation of the industrial flue gas, the temperature T2 of the flue gas outlet of the heat exchanger 3 is guaranteed to be maintained stably, the T2 is too high, the safety of the subsequent active coke desulfurization and denitration adsorption tower is affected, and the T2 is too low, so that the corrosion of the heat exchanger 3 and a pipeline is aggravated.
The heat exchanger 3 can adopt two arrangements: as shown in fig. 1, the heat source inlet and outlet pipeline and the cold source inlet and outlet pipeline of the heat exchanger 3 are arranged in a countercurrent manner, and the flowing directions of the industrial flue gas and the air are opposite; by adopting the countercurrent arrangement, the temperature difference of the heat exchanger 3 is larger, the equipment is smaller, the cost is lower, but the wall temperature of the heat exchange element at the flue gas outlet is lower, and the corrosion resistance is poorer. As shown in fig. 2, the heat source inlet and outlet pipeline and the cold source inlet and outlet pipeline of the heat exchanger 3 are arranged in a downstream manner, and the flowing directions of the industrial flue gas and the air are the same; the downstream arrangement is adopted, the temperature difference of the heat exchanger 3 is small, the equipment is large, the cost is high, but the wall surface temperature of the heat exchange element at the flue gas outlet is high, and the corrosion resistance is good.
The system cools the industrial flue gas through normal temperature air and removes water in the industrial flue gas, and has the advantages of high wall temperature, good corrosion resistance, simplicity, stability and long service life.
It will be understood that modifications and variations can be made by persons skilled in the art in light of the above teachings and all such modifications and variations are considered to be within the scope of the invention as defined by the following claims.
Claims (10)
1. A flue gas cooling system for an industrial flue gas active coke desulfurization and denitrification process is characterized in that: including the heat exchanger, the heat source inlet pipe of heat exchanger is connected to industrial flue gas pipeline, heat source outlet pipe is connected to active burnt SOx/NOx control adsorption tower, cold source inlet pipe is connected to the cooling blower, the direct evacuation of cold source outlet pipe or be connected to the waste heat utilization pipeline, be equipped with the high temperature defroster on the heat source inlet pipe, high temperature defroster bottom sets up the high temperature trap, be equipped with low temperature defroster and low temperature trap on the heat source outlet pipe, the low temperature trap is located the minimum of heat source outlet pipe.
2. The flue gas cooling system for the desulfurization and denitrification process of the industrial flue gas active coke as claimed in claim 1, wherein: the heat exchanger adopts a plurality of groups of heat exchange modules connected in parallel.
3. The flue gas cooling system for the desulfurization and denitrification process of the industrial flue gas active coke as claimed in claim 2, wherein: each group of heat exchange modules adopts a plurality of independent gravity type heat pipes as heat exchange elements.
4. The flue gas cooling system for the desulfurization and denitrification process of the industrial flue gas active coke as claimed in claim 3, wherein: the gravity type heat pipe smoke side material is carbon steel enamel plating, 316L stainless steel or 2205 duplex stainless steel.
5. The flue gas cooling system for the desulfurization and denitrification process of the industrial flue gas active coke as claimed in claim 3, wherein: the material of the air side of the gravity type heat pipe is carbon steel.
6. The flue gas cooling system for the desulfurization and denitrification process of the industrial flue gas active coke as claimed in any one of claims 1 to 5, wherein: an ash bucket is arranged at the bottom of the heat exchanger.
7. The flue gas cooling system for the desulfurization and denitrification process of the industrial flue gas active coke as claimed in any one of claims 1 to 5, wherein: the high-temperature demister and the low-temperature demister both adopt corrugated plate structures.
8. The flue gas cooling system for the desulfurization and denitrification process of the industrial flue gas active coke as claimed in any one of claims 1 to 5, wherein: the cooling blower adopts frequency conversion speed regulation.
9. The flue gas cooling system for the desulfurization and denitrification process of the industrial flue gas active coke as claimed in any one of claims 1 to 5, wherein: the heat source inlet and outlet pipeline and the cold source inlet and outlet pipeline of the heat exchanger are arranged in a countercurrent mode, and the flowing directions of industrial flue gas and air are opposite.
10. The flue gas cooling system for the desulfurization and denitrification process of the industrial flue gas active coke as claimed in any one of claims 1 to 5, wherein: the heat source inlet and outlet pipeline and the cold source inlet and outlet pipeline of the heat exchanger are arranged in a downstream mode, and the flowing directions of industrial flue gas and air are the same.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120531645.3U CN215027441U (en) | 2021-03-15 | 2021-03-15 | Flue gas cooling system for industrial flue gas active coke desulfurization and denitrification process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120531645.3U CN215027441U (en) | 2021-03-15 | 2021-03-15 | Flue gas cooling system for industrial flue gas active coke desulfurization and denitrification process |
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| Publication Number | Publication Date |
|---|---|
| CN215027441U true CN215027441U (en) | 2021-12-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120531645.3U Active CN215027441U (en) | 2021-03-15 | 2021-03-15 | Flue gas cooling system for industrial flue gas active coke desulfurization and denitrification process |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215027441U (en) |
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2021
- 2021-03-15 CN CN202120531645.3U patent/CN215027441U/en active Active
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