CN113480208A - System and method for improving quality of wet desulphurization gypsum by using waste heat - Google Patents
System and method for improving quality of wet desulphurization gypsum by using waste heat Download PDFInfo
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- CN113480208A CN113480208A CN202110892437.0A CN202110892437A CN113480208A CN 113480208 A CN113480208 A CN 113480208A CN 202110892437 A CN202110892437 A CN 202110892437A CN 113480208 A CN113480208 A CN 113480208A
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- gypsum
- heater
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- heat
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- 229910052602 gypsum Inorganic materials 0.000 title claims abstract description 204
- 239000010440 gypsum Substances 0.000 title claims abstract description 204
- 239000002918 waste heat Substances 0.000 title claims abstract description 50
- 238000000034 method Methods 0.000 title claims abstract description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 47
- 230000018044 dehydration Effects 0.000 claims abstract description 34
- 238000006297 dehydration reaction Methods 0.000 claims abstract description 34
- 238000006477 desulfuration reaction Methods 0.000 claims description 58
- 230000023556 desulfurization Effects 0.000 claims description 58
- 239000004071 soot Substances 0.000 claims description 51
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 25
- 239000003546 flue gas Substances 0.000 claims description 25
- 238000007664 blowing Methods 0.000 claims description 23
- 230000008569 process Effects 0.000 claims description 5
- 230000002209 hydrophobic effect Effects 0.000 claims description 4
- 230000008676 import Effects 0.000 claims description 4
- 238000010926 purge Methods 0.000 claims description 3
- 230000004048 modification Effects 0.000 abstract description 6
- 238000012986 modification Methods 0.000 abstract description 6
- 238000011084 recovery Methods 0.000 abstract description 2
- 238000007599 discharging Methods 0.000 description 7
- 238000010438 heat treatment Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- 238000010276 construction Methods 0.000 description 4
- 150000004683 dihydrates Chemical class 0.000 description 3
- 239000013078 crystal Substances 0.000 description 2
- 238000004134 energy conservation Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000003795 desorption Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-ZSJDYOACSA-N heavy water Substances [2H]O[2H] XLYOFNOQVPJJNP-ZSJDYOACSA-N 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 238000002386 leaching Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000010408 sweeping Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B11/00—Calcium sulfate cements
- C04B11/02—Methods and apparatus for dehydrating gypsum
- C04B11/028—Devices therefor characterised by the type of calcining devices used therefor or by the type of hemihydrate obtained
- C04B11/032—Devices therefor characterised by the type of calcining devices used therefor or by the type of hemihydrate obtained for the wet process, e.g. dehydrating in solution or under saturated vapour conditions, i.e. to obtain alpha-hemihydrate
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention discloses a system and a method for improving the quality of wet desulphurization gypsum by using waste heat, wherein the system comprises a waste heat system, a wet desulphurization gypsum dehydration layer and a desulphurization gypsum blanking device arranged at the position of a feed opening of the wet desulphurization gypsum dehydration layer, the desulphurization gypsum blanking device comprises a desulphurization gypsum heater, a plurality of blanking channels which are arranged up and down and are used for the dehydrated wet desulphurization gypsum to pass through are arranged on the desulphurization gypsum heater, a cavity for heat supply medium circulation is arranged around the blanking channels in the desulphurization gypsum heater, the cavity is provided with a heat medium inlet and a heat medium outlet, and the heat medium inlet is connected with the waste heat medium outlet of the waste heat system. The invention can heat the desulfurized gypsum by using the heat of low-quality steam or hot water, primarily remove the free water in the gypsum, improve the quality of the desulfurized gypsum and the recovery rate of waste heat, and reduce the heat consumption of the subsequent modification procedure.
Description
Technical Field
The invention belongs to the field of energy conservation and environmental protection, and relates to a system and a method for improving the quality of wet desulphurization gypsum by using waste heat.
Background
At present, the desulfurization gypsum generated by a coal-fired power plant is comprehensively utilized and is smaller than the output, the main mode of the generated desulfurization gypsum is still mainly stockpiled or abandoned, a large amount of land can be occupied as a result, the desulfurization gypsum contains ions which are not friendly to the environment, the leaching phenomenon can be generated in the stockpiling process, and the secondary pollution can be easily caused.
Desulfurized gypsum (CaSO)4·2H2O) has low economic added value, wide source and more impurities, and the modification of the gypsum is especially necessary to expand the application field of the gypsum. The dihydrate gypsum is heated and dehydrated under different conditions, so that different dehydrated phases are formed. Each dehydrated phase has different structure and phase product properties due to different formation conditions and different dehydration transformation modes.
The dihydrate gypsum is firstly required to remove free water carried by crystal water before the crystal water is dehydrated, the water content of the desulfurized gypsum of the existing coal-fired power plant is generally higher, generally between 12 and 15 percent and even more than 20 percent, and the water content directly influences the heat consumed by dihydrate gypsum modification.
During the production process of the coal-fired power plant, a small amount of low-quality steam or hot water with the temperature of more than 80 ℃ can be generated, such as heat tracing steam, hot water for recovering the waste heat of flue gas and the like, and the low-quality steam or hot water cannot be reused or has low utilization rate, thereby causing heat waste.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a system and a method for improving the quality of wet desulphurization gypsum by using waste heat.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
the utility model provides a system for utilize waste heat to improve wet flue gas desulfurization gypsum quality, includes utilizes waste heat system, wet flue gas desulfurization gypsum dehydration layer and sets up in the desulfurization gypsum unloader of wet flue gas desulfurization gypsum dehydration layer feed opening position, and the desulfurization gypsum unloader includes the desulfurization gypsum heater, sets up a plurality of about setting on the desulfurization gypsum heater, supplies the unloading passageway that the wet flue gas desulfurization gypsum after the dehydration passed, and the inside cavity that is equipped with the circulation of heat supply medium around the unloading passageway of desulfurization gypsum heater, the cavity has heat medium import and heat medium export, the heat medium import is connected with waste heat system's waste heat medium exit.
Preferably, the desulfurization gypsum blanking device further comprises soot blowers, the soot blowers are arranged on the upper side and the lower side of the desulfurization gypsum heater in the desulfurization gypsum blanking device respectively, the soot blowers on the upper side of the desulfurization gypsum heater are used for blowing inlets of blanking channels, and the soot blowers on the lower side of the desulfurization gypsum heater are used for blowing outlets of the blanking channels.
Preferably, the soot blower comprises soot blowers and soot blowing pipelines, the soot blowing pipelines are arranged on one side of the desulfurization gypsum heater, the soot blowers are arranged in a plurality of numbers, the soot blowers are connected with the soot blowing pipelines and are uniformly distributed on one side of the desulfurization gypsum heater, and pipelines for connecting the soot blowers and the soot blowing pipelines are provided with electric valves;
the inlet of the soot blowing pipeline is connected with a compressed air tank for soot blowing, and an electric valve is arranged on a connected pipeline.
Preferably, the waste heat system comprises a low-quality steam source and/or a low-quality hot water source, a waste heat medium outlet of the low-quality steam source and/or the low-quality hot water source is connected with a heat medium inlet of the cavity of the desulfurized gypsum heater, a valve is arranged at a waste heat medium outlet of the low-quality steam source, a water pump is arranged at a waste heat medium outlet of the low-quality hot water source, and valves are arranged at an inlet and an outlet of the water pump.
Preferably, the system for improving the quality of the wet desulphurization gypsum by using the waste heat further comprises a hydrophobic tank, and a heat medium outlet of the cavity of the desulphurization gypsum heater is connected to the hydrophobic tank through a pipeline.
Preferably, the desulfurized gypsum heater is in a plate heat exchange type, a tubular heat exchange type or a cylindrical heat exchange type;
when the desulfurized gypsum heater adopts a plate heat exchange type, the distance between the plates is 50mm-200 mm;
when the desulfurized gypsum heater adopts a tubular heat exchange type, the diameter of the heat exchange tube is 20mm-200mm, the heat exchange tube is a straight tube or a coiled tube, and the distance between the heat exchange tubes is 100mm-1000 mm;
when the desulfurized gypsum heater adopts a cylindrical heat exchange mode, the equivalent diameter of the feeding channel is 50-500 mm, and the aperture ratio is 20-60%.
Preferably, when the desulfurized gypsum heater adopts a cylindrical heat exchange type, the blanking channel is in the shape of a cylinder, a cuboid or an inverted round table with a large upper part and a small lower part.
Preferably, the height of the desulfurized gypsum heater is 100mm-1000 mm.
Preferably, the system for improving the quality of the wet desulfurization gypsum by using the waste heat further comprises a wet desulfurization gypsum dehydration device body and a gypsum library, wherein the wet desulfurization gypsum dehydration device body is arranged above the feed opening of the wet desulfurization gypsum dehydration layer, the gypsum outlet of the wet desulfurization gypsum dehydration device body corresponds to the feed opening of the wet desulfurization gypsum dehydration layer in position, and the gypsum library is positioned below the feed opening of the wet desulfurization gypsum dehydration layer.
The invention also provides a method for improving the quality of the wet desulphurization gypsum by using the waste heat, which comprises the following steps:
the dehydrated gypsum falls on the upper side of the desulfurized gypsum blanking device; the waste heat medium of the waste heat system enters the inner cavity of the desulfurized gypsum heater and heats the blanking channel;
the gypsum that falls on desulfurization gypsum unloader upside flows to the port down from the last port of unloading passageway, and at this in-process, the heat medium in the desulfurization gypsum heater inner chamber carries out the free water that heat transfer, desorption gypsum carried, retrieves the gypsum that flows from the port under the unloading passageway.
The invention has the following beneficial effects:
in the system for improving the quality of the wet desulphurization gypsum by using the waste heat, the desulphurization gypsum heater is arranged at the feed opening of the dehydration layer of the wet desulphurization gypsum, and a plurality of feed channels which are arranged up and down and are used for the dehydrated wet desulphurization gypsum to pass through are arranged on the desulphurization gypsum heater, so the dehydrated gypsum can normally pass through the feed channels. And because the heat medium inlet is connected with the waste heat medium outlet of the waste heat system, the heating heat source of the desulfurized gypsum heater adopts the waste heat of the system, thereby realizing the effects of waste heat utilization, energy conservation and emission reduction. In the system for improving the quality of the wet desulphurization gypsum by using the waste heat, the desulphurization gypsum blanking device is arranged at the position of the blanking port of the wet desulphurization gypsum dehydration layer, so that the desulphurization gypsum blanking device can be transformed by using the position of the blanking port of the existing wet desulphurization gypsum dehydration layer, the transformation workload is small, the operation is reliable, the overhaul and the maintenance are convenient and simple, and the popularization and the application are convenient. In conclusion, the invention can heat the desulfurized gypsum by using the heat of low-quality steam or hot water, primarily remove the free water in the gypsum, improve the quality of the desulfurized gypsum and the recovery rate of waste heat, and reduce the heat consumption of the subsequent modification process.
Furthermore, in order to avoid that the gypsum is adhered to the surface of the desulfurized gypsum heater to reduce the heat exchange effect, the upper side and the lower side of the desulfurized gypsum heater are respectively provided with a soot blower, and the soot blowers can be used for periodically sweeping the gypsum on the surface of the desulfurized gypsum heater.
Drawings
FIG. 1 is a schematic structural diagram of a system for improving the quality of wet-process desulfurization gypsum by using waste heat according to the present invention;
FIG. 2 is a schematic view of a desulfurized gypsum heater according to the invention;
FIG. 3 is a schematic view of a second construction of the desulfurized gypsum heater of the present invention;
FIG. 4 is a schematic view showing a third construction of the desulfurized gypsum heater of the present invention;
FIG. 5 is a schematic view showing a fourth construction of the desulfurized gypsum heater of the present invention;
FIG. 6 is a schematic view showing a fifth construction of the desulfurized gypsum heater of the present invention.
Wherein, 1 is the wet flue gas desulfurization gypsum dewatering device body, 2 is the desulfurization gypsum unloader, 3 is the desulfurization gypsum heater, 4 is the wet flue gas desulfurization gypsum dehydration layer, 5 is the gypsum storehouse, 6 is low-quality steam source, 7 is low-quality hot water source, 8 is the water pump, 9 is the sparse pond, 10 is heat medium water inlet/steam pipe, 11 is heat medium play water/steam pipe, 12 is soot blower, 13 is the electric valve, 14 is the compressed air jar for blowing off the ash, 15 is the soot blower, 16 is the soot blowing pipeline, 17 is the unloading passageway, 18 is the honeycomb duct.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings:
referring to fig. 1, the system for improving the quality of wet flue gas desulfurization gypsum by using waste heat of the present invention comprises a wet flue gas desulfurization gypsum dehydration device body 1 and a flue gas desulfurization gypsum discharging device 2, wherein the wet flue gas desulfurization gypsum dehydration device body 1 is located above a wet flue gas desulfurization gypsum dehydration layer 4, the flue gas desulfurization gypsum discharging device 2 is located at a discharging port of the wet flue gas desulfurization gypsum dehydration layer 4, the flue gas desulfurization gypsum discharging device 2 comprises a flue gas desulfurization gypsum heater 3, a heat medium water/steam inlet/outlet pipe 10, a heat medium water/steam inlet/outlet pipe 11 and a soot blower 12, the flue gas desulfurization gypsum heater 3 is installed at the discharging port of the wet flue gas desulfurization gypsum dehydration layer 4, the upper side and the lower side of the flue gas desulfurization gypsum heater 3 are respectively provided with a soot blower 12, the soot blower 12 comprises a soot blower 15, a soot blowing pipeline 16 and an electric valve 13, the soot blowing pipeline 16 is arranged at one side of the flue gas desulfurization gypsum heater 3 (as shown in fig. 1, the upper side and the lower side of the desulfurized gypsum heater 3 are respectively provided with a soot blowing pipeline 16), the soot blowing pipeline 16 is connected with a plurality of soot blowers 15, the soot blowers 15 are uniformly distributed at one side of the desulfurized gypsum heater 3, the electric valves 13 are arranged on the connecting pipelines of the soot blowers 15 and the soot blowing pipeline 16, the electric valves 13 can control the stop and the circulation of the air flow at the inlet of the soot blowers 15, and the inlet of the soot blowing pipeline 16 is connected with a compressed air tank 14 for soot blowing. Referring to fig. 1-6, a plurality of blanking channels 17 are formed in the desulfurized gypsum heater 3, a cavity for flowing a heating medium is formed in the desulfurized gypsum heater 3, the low-quality steam source 6 is communicated with the cavity in the desulfurized gypsum heater 3 through a heating medium water inlet/steam pipe 10, the low-quality hot water source 7 is communicated with the cavity in the desulfurized gypsum heater 3 through a low-quality hot water pump through the heating medium water inlet/steam pipe 10, as shown in fig. 1, an electric valve 13 is arranged at an outlet of the low-quality steam source 6, the low-quality hot water source 7 is connected with a water pump 8, and the electric valve 13 is arranged at an inlet and an outlet of the water pump 8. The water draining tank 9 is communicated with a cavity inside the desulfurized gypsum heater 3 through a heating medium water outlet/steam pipe 11.
When the device works, gypsum dehydrated by the wet desulphurization gypsum dehydration device body 1 falls to the gypsum warehouse 5 through the desulphurization gypsum blanking device 2. The cavity in the desulfurized gypsum heater 3 is communicated with the heating medium water/steam inlet pipe 10 and the heating medium water/steam outlet pipe 11 through the diversion pipe 18.
Referring to fig. 2 to 5, the desulfurized gypsum heater 3 of the present invention can be of a plate heat exchange type, a tube heat exchange type or a cylinder heat exchange type. The plate heat exchange type desulfurized gypsum heater 3 can adjust the heat exchange effect by setting the plate spacing distance between 50mm to 200 mm. The tubular heat exchange type desulfurized gypsum heater 3 can adjust the heat exchange effect by setting the diameter and the interval of the heat exchange tubes, the interval of the heat exchange tubes is 100mm-1000mm, the diameter of the heat exchange tubes is 20mm-200mm, and the heat exchange tubes are straight tubes and coiled tubes. The cylindrical heat exchange type desulfurized gypsum heater 3 adjusts the heat exchange effect by setting the aperture ratio and the size of the blanking channel 17, the equivalent diameter of the blanking channel 17 is 50mm-500mm, and the aperture ratio is 20% -60%. The blanking channel 17 in the cylindrical heat exchange type desulfurized gypsum heater 3 is in the shape of a cylinder, a cuboid or an inverted round table with a large upper part and a small lower part.
The height of the desulfurized gypsum heater 3 can be set according to the required heat exchange quantity, and is 100mm-1000 mm. The discharging channels 17 of the desulfurized gypsum heater 3 are uniformly distributed.
Referring to fig. 2 and 6, the desulfurized gypsum discharging device has a circular or rectangular section.
In addition, the invention can be modified by utilizing the position of the feed opening of the existing wet desulphurization gypsum dehydration layer, and has the advantages of less modification workload, reliable operation, convenient and simple maintenance and convenient popularization and application.
The low-quality steam/hot water can be taken from a heat source with the temperature of over 80 ℃ and low utilization rate in the industrial production process. The low-quality steam/hot water can enter the desulfurized gypsum heater 3 through the self pressure, and can also enter the desulfurized gypsum heater 3 through additionally arranging a supercharging device.
The above-mentioned desulfurized gypsum heater 3 is a preferred embodiment of the present invention, and is not intended to limit the present invention, and the desulfurized gypsum heater 3 can be modified, improved or substituted with equivalents within the principle of the present invention.
In the concrete operation, the gypsum dehydrated by the wet desulphurization gypsum dehydration device is subjected to heat exchange with low-quality steam or low-quality hot water in the desulphurization gypsum heater through the desulphurization gypsum blanking device, and the free water carried by the gypsum is removed and then falls into a gypsum warehouse for accumulation. In order to avoid the gypsum from being stuck on the surface of the desulfurized gypsum heater to reduce the heat exchange effect, the soot blower is periodically started to carry out purging. The process can greatly reduce the water content of the desulfurized gypsum, improve the quality of the gypsum, widen the gypsum sales channel, improve the sales price, reduce the energy consumption of the subsequent modification process and improve the current situation that the desulfurized gypsum is mainly stockpiled or discarded while recovering the heat of low-quality steam/hot water. The feed opening position of the available current wet flue gas desulfurization gypsum dehydration layer of desulfurization gypsum unloader reforms transform, and it is less to reform transform the work load, and the operation is reliable, and it is convenient, simple to overhaul and maintain, facilitate promotion and application.
Claims (10)
1. The utility model provides a system for utilize waste heat to improve wet flue gas desulfurization gypsum quality, a serial communication port, including utilizing waste heat system, wet flue gas desulfurization gypsum dehydration layer (4) and setting up in desulfurization gypsum unloader (2) of wet flue gas desulfurization gypsum dehydration layer (4) feed opening position, desulfurization gypsum unloader (2) are including desulfurization gypsum heater (3), set up a plurality of about setting on desulfurization gypsum heater (3), supply unloading passageway (17) that wet flue gas desulfurization gypsum after the dehydration passed, desulfurization gypsum heater (3) inside is equipped with the cavity of heat supply medium circulation around unloading passageway (17), the cavity has heat medium import and heat medium export, heat medium import and waste heat system's waste heat medium exit linkage.
2. The system for improving the quality of wet desulphurization gypsum by using waste heat according to claim 1, wherein the desulphurization gypsum blanking device (2) further comprises a soot blower (12), the upper and lower sides of the desulphurization gypsum heater (3) in the desulphurization gypsum blanking device (2) are respectively provided with the soot blower (12), the soot blower (12) on the upper side of the desulphurization gypsum heater (3) is used for purging an inlet of the blanking channel (17), and the soot blower (12) on the lower side of the desulphurization gypsum heater (3) is used for purging an outlet of the blanking channel (17).
3. The system for improving the quality of the wet desulphurization gypsum by using the waste heat as claimed in claim 2, wherein the soot blower (12) comprises a plurality of soot blowers (15) and soot blowing pipelines (16), the soot blowing pipelines (16) are arranged at one side of the desulphurization gypsum heater (3), the soot blowers (15) are arranged, the soot blowers (15) are connected with the soot blowing pipelines (16) and are uniformly distributed at one side of the desulphurization gypsum heater (3), and electric valves (13) are arranged on the pipelines connecting the soot blowers (15) and the soot blowing pipelines (16);
the inlet of the soot blowing pipeline (16) is connected with a compressed air tank (14) for soot blowing, and an electric valve (13) is arranged on the connected pipeline.
4. The system for improving the quality of the wet desulphurization gypsum by using the waste heat as claimed in claim 1, wherein the waste heat system comprises a low-quality steam source (6) and/or a low-quality hot water source (7), a waste heat medium outlet of the low-quality steam source (6) and/or the low-quality hot water source (7) is connected with a heat medium inlet of a cavity of the desulphurization gypsum heater (3), a valve is arranged at the waste heat medium outlet of the low-quality steam source (6), a water pump (8) is arranged at the waste heat medium outlet of the low-quality hot water source (7), and valves are arranged at an inlet and an outlet of the water pump (8).
5. The system for improving the quality of the wet desulphurization gypsum by using the waste heat as the claim 1 is characterized by further comprising a hydrophobic tank (9), wherein the heat medium outlet of the cavity of the desulphurization gypsum heater (3) is connected to the hydrophobic tank (9) through a pipeline.
6. The system for improving the quality of the wet desulphurization gypsum by using the waste heat as claimed in claim 1, wherein the desulphurization gypsum heater (3) is in the form of plate type heat exchange type, tubular type heat exchange type or cylindrical type heat exchange type;
when the desulfurized gypsum heater (3) adopts a plate heat exchange type, the distance between plates is 50mm-200 mm;
when the desulfurization gypsum heater (3) adopts a tubular heat exchange type, the diameter of the heat exchange tube is 20mm-200mm, the heat exchange tube is a straight tube or a coiled tube, and the distance between the heat exchange tubes is 100mm-1000 mm;
when the desulfurized gypsum heater (3) adopts a cylindrical heat exchange type, the equivalent diameter of the feeding channel (17) is 50-500 mm, and the aperture ratio is 20-60%.
7. The system for improving the quality of the wet desulphurization gypsum by using the waste heat as claimed in claim 6, wherein when the desulphurization gypsum heater (3) adopts a cylindrical heat exchange type, the blanking channel (17) is in the shape of a cylinder, a cuboid or an inverted truncated cone with a large top and a small bottom.
8. The system for improving the quality of the wet desulphurization gypsum by using the residual heat as claimed in claim 1 or 6, wherein the height of the desulphurization gypsum heater (3) is 100mm-1000 mm.
9. The system for improving the quality of wet desulphurization gypsum by using waste heat according to claim 1, further comprising a wet desulphurization gypsum dehydration device body (1) and a gypsum library (5), wherein the wet desulphurization gypsum dehydration device body (1) is arranged above the feed opening of the wet desulphurization gypsum dehydration layer (4), the gypsum outlet of the wet desulphurization gypsum dehydration device body (1) corresponds to the feed opening of the wet desulphurization gypsum dehydration layer (4), and the gypsum library (5) is positioned below the feed opening of the wet desulphurization gypsum dehydration layer (4).
10. A method for improving the quality of wet desulphurization gypsum by using waste heat is characterized by comprising the following steps:
the dehydrated gypsum falls on the upper side of the desulfurized gypsum blanking device (2); a waste heat medium of the waste heat system enters an inner cavity of the desulfurized gypsum heater (3) and heats the blanking channel (17);
the gypsum falling on the upper side of the desulfurized gypsum blanking device (2) flows to the lower port from the upper port of the blanking channel (17), and in the process, the heat medium in the inner cavity of the desulfurized gypsum heater (3) exchanges heat with the gypsum and removes the free water carried by the gypsum, so that the gypsum flowing out from the lower port of the blanking channel (17) is recovered.
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| CN202110892437.0A CN113480208B (en) | 2021-08-04 | 2021-08-04 | System and method for improving quality of wet desulphurization gypsum by utilizing waste heat |
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| CN213778750U (en) * | 2020-12-10 | 2021-07-23 | 无锡丹骏智能装备有限公司 | Waste heat recycling system for high-strength gypsum powder production line |
| CN215327780U (en) * | 2021-08-04 | 2021-12-28 | 西安热工研究院有限公司 | System for utilize waste heat to improve wet flue gas desulfurization gypsum quality |
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| CN101746979A (en) * | 2009-12-22 | 2010-06-23 | 上海大学 | Circulatory dewatering system device for desulfurization gypsum in coal-fired power plant |
| CN201817413U (en) * | 2010-09-21 | 2011-05-04 | 上海大学 | Device for stimulating afterheat in power plant to process desulphurization gypsum |
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| CN213778750U (en) * | 2020-12-10 | 2021-07-23 | 无锡丹骏智能装备有限公司 | Waste heat recycling system for high-strength gypsum powder production line |
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