CN212482227U - Heat exchange device for desulfurization wastewater and flue gas waste heat - Google Patents
Heat exchange device for desulfurization wastewater and flue gas waste heat Download PDFInfo
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- CN212482227U CN212482227U CN202021316942.8U CN202021316942U CN212482227U CN 212482227 U CN212482227 U CN 212482227U CN 202021316942 U CN202021316942 U CN 202021316942U CN 212482227 U CN212482227 U CN 212482227U
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- Y02B30/56—Heat recovery units
Abstract
The utility model relates to a heat exchange device for desulfurization waste water and flue gas waste heat, wherein a plurality of flue gas waste heat exchangers are connected and arranged in a flue, a concentration device is also arranged, the inlet of the flue gas waste heat exchanger is connected with the outlet of the concentration device through a pipeline, and the outlet of the flue gas waste heat exchanger is connected with the inlet of the concentration device through a pipeline; the inlet pipeline of the concentration device is provided with a temperature detection device; the circulating pump is arranged on a pipeline between the inlet of the flue gas waste heat exchanger and the outlet of the concentration device, and the pipeline is also provided with a pressure detection device, a temperature detection device, a flow detection device, a washing water gap and a drain hole; the concentration device is provided with a fluid infusion port. The utility model discloses not only reduced the emission of desulfurization waste water, more importantly make full use of power plant low efficiency heat source has realized the benefit of low efficiency heat source.
Description
Technical Field
The utility model relates to a dirty/waste water treatment technical field specifically relates to a coal fired power plant desulfurization waste water and flue gas waste heat exchange device.
Background
Nowadays, national economy develops rapidly, and the pressure of resources and environment, economic development and energy consumption is increasing day by day. In order to reduce the influence of sewage/wastewater discharge on the ecological environment and improve the environment, various measures such as water conservation, comprehensive utilization of wastewater, zero wastewater discharge and the like are adopted in various social industries to reduce the sewage/wastewater discharge.
In the self-contained power plants of thermal power generation enterprises, heat supply enterprises and various enterprises, after various waste water produced in the production process is comprehensively utilized, a large amount of high-concentration salt waste water (the high-concentration salt waste water is mainly desulfurization waste water and can also be called high-concentrated salt waste water or high-salt waste water) still remains, the influence of the waste water discharge on the ecological environment is large, and in recent years, most enterprises adopt the zero discharge measure of the desulfurization waste water to reduce the influence on the environment. In the actual operation process, the residual desulfurization wastewater amount is far higher than the treatment capacity of high-temperature flue gas atomization drying, concentration and decrement treatment is required, the conventional concentration and decrement treatment processes mainly comprise a membrane method concentration and decrement process and a thermal method concentration and decrement process, the membrane method concentration and decrement process has high pretreatment requirements and high operation cost, the conventional concentration and decrement treatment processes are less adopted in desulfurization wastewater zero emission treatment, a power plant has more steam resources, and a thermal method concentration process using steam as a heat source is adopted, although the steam resources of the power plant are more, the steam belongs to high-value resources, the consumption of the steam inevitably increases the coal consumption of the power plant, and the income of the power plant is reduced.
For example, chinese patent application CN 206142861U discloses a low-temperature waste heat concentration system for waste water of a thermal power plant. The system comprises a dust remover, a desulfurization absorption tower, a wastewater collection box, a pretreatment device, a wastewater preheating device and an evaporation concentration tower, wherein the wastewater preheating device preheats the pretreated wastewater by using the heat of flue gas in a flue between the dust remover and the desulfurization absorption tower; the evaporation concentration tower is used for carrying out low-temperature evaporation on the preheated wastewater. This patent adopts flue gas waste heat recoverer to retrieve the heat in the flue gas, and waste water is given with the heat transfer to the rethread waste water preheater. In this patent, waste water is not direct can reduce the corruption to gas heater under some process conditions with gas heater heat transfer, nevertheless because the flue gas temperature behind the dust remover is lower, the heat of gaining is limited, twice heat transfer inevitably leads to the fact the reduction of heat transfer efficiency, and the heat utilization efficiency descends, leads to the fact the increase of indirect heating equipment heat transfer area on the contrary, and increased the system flow, increased indirect heating equipment and subsidiary circulating pump, control instrument and electrical system, investment and working costs corresponding increase on the contrary.
For example, chinese patent application CN 206755129U discloses a steam generator using waste heat of boiler flue gas, which comprises: the system comprises a flue heat exchanger, a steam heater, a steam condensate water tank and medium water; the flue heat exchanger is arranged in a discharge channel of boiler flue gas, a steam generator and a lower water collecting tank which are connected with a heat exchange tube are arranged on the flue gas heat exchanger, the steam generator is connected with a steam inlet of a steam heater through a steam pipeline, a condensate outlet of the steam heater is connected with a condensate inlet of the steam condensate tank, the condensate outlet of the steam condensate tank is connected with the lower water collecting tank through a water pump to form a medium water circulation loop, a cooling pipeline for exchanging heat with steam is further arranged on the steam heater, and an outlet end of the cooling pipeline is connected with a heat demand device. This patent adopts the heat in the flue heat exchanger recovery flue gas, and rethread steam generator is steam with heat conversion, gives waste water through steam heater with the heat transfer at last. In this patent, waste water is not direct and flue heat exchanger contact heat transfer, can reduce the corruption to flue gas heat exchanger under some process conditions, nevertheless because the flue gas temperature behind the dust remover is lower, the heat of trading for is limited, and twice heat transfer can cause the reduction of heat transfer efficiency, and heat transfer area increases, and the input of a large amount of increase energy can be in the change of heat transfer medium attitude to the system flow increases, and equipment increases, and investment and working costs also can corresponding increase.
For example, chinese patent application CN 105330081 a discloses a method and system suitable for zero discharge of desulfurization wastewater in power plants. The system comprises a medicament softening treatment device, a resin softening device, a reverse osmosis treatment device and an evaporation crystallization device. In the patent application, the method of softening the medicament and softening the branches is adopted to remove impurities and heavy metals in the desulfurization wastewater so as to avoid reverse osmosis and evaporation crystallization, so that the whole set of pollution blockage and scaling is avoided. And the sludge produced by chemical softening has low value and great difficulty in comprehensive utilization. The desulfurization wastewater is concentrated by reverse osmosis, the concentration ratio is low, and a large amount of high-quality steam is consumed for evaporative crystallization. The overall investment and operating costs are high.
In the production process of self-contained power plants of thermal power generation enterprises, heat supply enterprises and various enterprises, a large amount of high-temperature flue gas is generated, most of the heat of the flue gas is recovered by heat exchange equipment such as an economizer, an air preheater, a low-temperature economizer and the like, but a large amount of flue gas with the temperature of 110 +/-15 ℃ still remains (40-45 ten thousand Nm & lt/EN & gt is generated per 100MW operation load)3H flue gas), the part of flue gas enters a desulfurizing tower to remove sulfur dioxide and is simultaneously cooled to about 55 ℃ for emission, so that the desulfurizing tower consumes a large amount of water resources (10-12 m is consumed per 100MW of operation load)3Water/h) and causes an increase in the amount of desulfurization waste water.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the problem that a desulfurization waste water and flue gas waste heat exchange device is provided. Desulfurization waste water and flue gas waste heat exchange device use desulfurization waste water as the running medium, the technology is succinct, easy and simple to handle, the operation is stable, low cost, and concentrated respond well, has not only reduced the emission of desulfurization waste water, more importantly make full use of low efficiency heat source of power plant has realized the benefit of low efficiency heat source.
The utility model discloses the technical means who adopts is: a flue of a heat exchange device for desulfurization waste water and flue gas waste heat is connected with a plurality of flue gas waste heat exchangers and is also provided with a concentration device, the inlet of each flue gas waste heat exchanger is connected with the outlet of the concentration device through a pipeline, and the outlet of each flue gas waste heat exchanger is connected with the inlet of the concentration device through a pipeline; the inlet pipeline of the concentration device is provided with a temperature detection device; the circulating pump is arranged on a pipeline between the inlet of the flue gas waste heat exchanger and the outlet of the concentration device, and the pipeline is also provided with a pressure detection device, a temperature detection device, a flow detection device, a washing water gap and a drain hole; the concentration device is provided with a fluid infusion port.
The flue gas waste heat exchanger is provided with an upper half fixing device and a lower half fixing device, an outlet pipe is arranged at the top of the upper half fixing device to form an outlet of the flue gas waste heat exchanger, an inlet of the flue gas waste heat exchanger is arranged at the bottom of the lower half fixing device, a plurality of longitudinally arranged heat exchange pipes are arranged between the upper half fixing device and the lower half fixing device, the heat exchange pipes are wound on the binding devices, and longitudinal supporting frameworks are arranged inside the heat exchange pipes.
The heat exchange tube is made of ND steel, dual-phase steel 2205, dual-phase steel 2507, titanium alloy, polytetrafluoroethylene or ND steel lining silicon carbide.
The upper half fixing device comprises an upper end enclosure, an upper flange, an upper neck pipe and an upper fixing plate from top to bottom in sequence, and the lower half fixing device comprises a lower fixing plate, a lower neck pipe, a lower flange and a lower end enclosure from top to bottom in sequence; the flue gas waste heat exchanger penetrates through the top plate and the bottom plate of the flue and is respectively connected with the top plate and the bottom plate of the flue in a sealing mode through the upper fixing plate and the lower fixing plate.
A chemical feeding port is also arranged on the pipeline between the inlet of the flue gas waste heat exchanger and the outlet of the concentration device.
The front end of the fluid infusion port is provided with a precipitation device, and the front end or the rear end of the precipitation device is provided with a drug feeding port.
And a density detection device is also arranged on the pipeline between the inlet of the flue gas waste heat exchanger and the outlet of the concentration device.
And the inlet and outlet pipelines at two ends of the flue gas waste heat exchanger are respectively provided with a stop valve.
The utility model discloses the beneficial effect who reaches as follows.
1. The device takes the desulfurization wastewater with high salt content, high insoluble solids and easy scaling as a medium, and can effectively reduce the risk of scaling of the heat exchange tube and ensure the safe and stable operation of the heat exchange device by adopting quenching and tempering, forced circulation and heat exchange tube materials with difficult scaling.
2. The device adopts a direct heat exchange structure (one-step heat exchange) of the desulfurization wastewater and the flue gas heat exchanger, simplifies a flue gas waste heat utilization process system, and has high heat exchange efficiency, simple operation and low energy consumption.
3. The heat exchange device for the desulfurization wastewater and the flue gas waste heat can be arranged on a main flue behind a boiler air preheater, and the tail end flue gas waste heat is recovered by utilizing the high-efficiency heat exchange characteristic of the heat exchange device, so that the energy utilization efficiency is improved.
4. The heat exchange device for the desulfurization wastewater and the flue gas waste heat adopts the design of the vertical tube type cluster tube heat exchange tubes, so that the heat exchange efficiency is high, and the blockage and scaling are not easy to happen.
5. The inlet and outlet of the desulfurization wastewater and flue gas waste heat exchange device are provided with the neck pipe and the isolating valve, so that the device is convenient to overhaul, and a single device can be checked and maintained on line.
6. The desulfurization waste water and flue gas waste heat exchange device has less workload for improving the original flue and occupies less space.
7. The heat exchange device for the desulfurization wastewater and the flue gas waste heat can be matched with various thermal evaporation concentration devices such as a low-temperature multi-effect evaporator (MED), a mechanical vapor recompression evaporator (MVR), a membrane distillation evaporator and the like, and has a wide application range.
8. The heat exchange device for the desulfurization wastewater and the flue gas waste heat simplifies a thermal evaporation concentration process system, and has lower operating cost and engineering investment.
Drawings
Fig. 1 is a schematic view of the structure connection of the embodiment 1 of the present invention.
Fig. 2 is a schematic structural diagram of a flue gas waste heat exchanger in embodiment 2.
Fig. 3 is a schematic structural connection diagram of the second embodiment of the present invention.
Fig. 4 is a schematic structural diagram of a flue gas waste heat exchanger in embodiment 2.
Fig. 5 is a schematic structural connection diagram of the embodiment of the present invention 3.
Fig. 6 is a schematic structural connection diagram of the embodiment of the present invention 4.
Detailed Description
As shown in fig. 1-6, in the heat exchange device for desulfurization wastewater and flue gas waste heat of the present invention, a flue 2 is connected with a plurality of flue gas waste heat exchangers 1 and a concentration device 3, an inlet of the flue gas waste heat exchanger 1 is connected with an outlet of the concentration device 3 through a pipeline, and an outlet of the flue gas waste heat exchanger 1 is connected with an inlet of the concentration device 3 through a pipeline; the inlet pipeline of the concentration device 3 is provided with a temperature detection device 14; the circulating pump 4 is arranged on a pipeline between the inlet of the flue gas waste heat exchanger 1 and the outlet of the concentration device 3, and the pipeline is also provided with a pressure detection device 13, a temperature detection device 14, a flow detection device 15, a washing water gap 5 and a drain outlet 6; the concentration device 3 is provided with a fluid infusion port 11. The pipelines and the equipment are sequentially connected to form a loop, and the circulation, heat exchange and evaporation concentration of the high-concentration salt wastewater in the equipment and the pipelines are realized through a circulating pump.
The liquid used in the pipeline is desulfurization waste water, and the desulfurization waste water can be desulfurization waste water generated by a wet desulfurization system of a self-provided power plant of a thermal power generation enterprise, a heat supply enterprise or various enterprises, concentrated water of a reverse osmosis system, regenerated waste water of an ion exchange system, concentrated waste water of an acid/alkali washing system and other high-concentration salt waste water with the salt content of more than 10000 mg/L.
The desulfurization wastewater can be desulfurization wastewater without insoluble solids, or desulfurization wastewater containing less than 100000mg/L of insoluble solids, wherein the insoluble solids are mainly gypsum. Furthermore, the desulfurization wastewater is 10000-50000 mg/L insoluble solid, and the insoluble solid component is mainly gypsum; furthermore, the desulfurization wastewater is an insoluble solid with the concentration of 10000-30000 mg/L.
The flue gas waste heat exchanger 1 can be a vertically-installed cluster-type tube heat exchanger and is provided with an upper half fixing device and a lower half fixing device, an outlet pipe 18 is arranged at the top of the upper half fixing device to form an outlet of the flue gas waste heat exchanger 1, an inlet pipe 28 is arranged at the bottom of the lower half fixing device to form an inlet of the flue gas waste heat exchanger 1, a plurality of longitudinally-arranged heat exchange tubes 23 are arranged between the upper half fixing device and the lower half fixing device, the heat exchange tubes 23 surround a binding device 29, and a longitudinal support framework 30 is arranged inside the heat exchange tubes. The upper half fixing device here is an upper end socket 19, an upper flange 20, an upper neck pipe 21 and an upper fixing plate 22 in sequence from top to bottom. The lower half fixing device here is a lower fixing plate 24, a lower neck pipe 25, a lower flange 26 and a lower end enclosure 27 in sequence from top to bottom. The flue gas waste heat exchanger 1 penetrates through the top plate and the bottom plate of the flue 2 and is respectively connected with the top plate and the bottom plate of the flue 2 in a sealing way through an upper fixing plate 22 and a lower fixing plate 24. Both ends import, all can set up trip valve 8 according to the demand on the outlet pipeline of flue gas waste heat exchanger 1, all sets up the flexible coupling between the trip valve 8 of flue gas waste heat exchanger upper cover 19 and export, between closing valve 8 of lower head 27 and entry.
The heat exchange tube 23 may be made of ND steel, dual phase steel 2205, dual phase steel 2507, titanium alloy, teflon or ND steel lined with silicon carbide, or other materials suitable for heat exchange conditions.
A chemical adding port 7 is also arranged on the pipeline between the inlet of the flue gas waste heat exchanger 1 and the outlet of the concentration device 3.
The front end of the fluid infusion port 11 is provided with a precipitation device 31, and the front end or the rear end of the precipitation device 31 is provided with a drug feeding port 7.
A density detection device 301 is also arranged on the pipeline between the inlet of the flue gas waste heat exchanger 1 and the outlet of the concentration device 3.
The utility model discloses in the outer wall of flue, the outer equipment of flue, pipeline, valve, instrument tube all adopt and to get heat preservation or thermal-insulated measure.
Example 1
As shown in fig. 1, the embodiment specifically discloses a device for exchanging heat between desulfurization wastewater and flue gas waste heat, wherein a support 17 is arranged at the bottom of a flue 2, the flue 2 is connected with a plurality of flue gas waste heat exchangers 1, and is further provided with a concentration device 3, an inlet of each flue gas waste heat exchanger 1 is connected with an outlet of the concentration device 3 through a pipeline, and an outlet of each flue gas waste heat exchanger 1 is connected with an inlet of the concentration device 3 through a pipeline; the inlet pipeline of the concentration device 3 is provided with a temperature detection device 14; circulating pump 4 sets up on the pipeline between the export of 1 import of flue gas waste heat exchanger and enrichment facility 3, realizes circulation, heat exchange and the evaporative concentration of desulfurization waste water in above-mentioned equipment and pipeline through circulating pump 4. The circulating pump 4 can be a circulating pump operated by a single set, and the flow rate is 1000-1500m3The pipeline is also provided with a pressure detection device 13, a temperature detection device 14, a flow detection device 15, a washing water gap 5, a discharge port 6 and a dosing port 7; the concentration device 3 is provided with a fluid infusion port 11. The pipelines and the equipment are sequentially connected to form a loop, and the circulation, heat exchange and evaporation concentration of the high-concentration salt wastewater in the equipment and the pipelines are realized through a circulating pump.
The flue gas waste heat exchanger 1 can be a vertically-installed cluster-type tube heat exchanger and is provided with an upper half fixing device and a lower half fixing device, an outlet pipe 18 is arranged at the top of the upper half fixing device to form an outlet of the flue gas waste heat exchanger 1, an inlet of the flue gas waste heat exchanger 1 of a water inlet pipe 28 is arranged at the bottom of the lower half fixing device, and a plurality of longitudinally-arranged heat exchange pipes 23 are arranged between the upper half fixing device and the lower half fixing device. As shown in fig. 2, the upper half fixing device includes, in order from top to bottom, an upper head 19, an upper flange 20, an upper neck tube 21, and an upper fixing plate 22. The lower half fixing device here is a lower fixing plate 24, a lower neck pipe 25, a lower flange 26 and a lower end enclosure 27 in sequence from top to bottom. The flue gas waste heat exchanger 1 penetrates through the top plate and the bottom plate of the flue 2 and is respectively connected with the top plate and the bottom plate of the flue 2 in a sealing way through an upper fixing plate 22 and a lower fixing plate 24. Both ends import, all can set up trip valve 8 according to the demand on the outlet pipeline of flue gas waste heat exchanger 1, all sets up the flexible coupling between the trip valve 8 of flue gas waste heat exchanger upper cover 19 and export, between closing valve 8 of lower head 27 and entry. The heat exchange tube 23 is made of ND steel silicon carbide lined composite tube. Besides the above devices, necessary electrical systems and control systems can be provided, which are known to those skilled in the art, and the device structure is mainly protected in the present application, and the electrical systems and control systems are not described herein again.
In the embodiment, the flue gas waste heat exchanger 1 is installed on the front flue 2 of the desulfurizing tower in a penetrating manner, the embodiment is provided with 7 flue gas waste heat exchangers in parallel, the heat exchangers are cluster type tubular heat exchangers, and the installation mode is vertical installation.
In this embodiment, the water replenishing port 11 and the water discharging port 12 of the flue gas waste heat exchange device are both arranged in the concentration device 3, the air discharging port 10 is arranged at the upper end of the concentration device 3 (arranged on the condenser), and the dosing port 7, the exhaust port 6, the flushing water port and the cleaning water port 5 are arranged on an outlet pipeline of the circulating pump and can be provided with isolating valves.
The desulfurization wastewater in the embodiment is mixed wastewater of desulfurization wastewater, concentrated water of a reverse osmosis system of a power plant, regenerated wastewater of an ion exchange system and concentrated drainage of an acid/alkali washing system, and insoluble solids contained in the wastewater are 15000-30000 mg/L.
Example 2
As shown in fig. 3, in this embodiment, the flue gas waste heat exchanger 1 is installed on the front flue 2 of the desulfurization tower in a penetrating manner, in this embodiment, 20 groups of flue gas waste heat exchangers are arranged in parallel, and each group of 10 bundled tube type heat exchangers are installed in a vertical manner. The heat exchange tube 23 is made of polytetrafluoroethylene.
As shown in FIG. 4, the heat exchange tubes 23 of the flue gas waste heat exchanger 1 are surrounded by a binding device 29, and a longitudinal supporting framework 30 is arranged inside the heat exchange tubes.
In the embodiment, the content of insoluble solids in the desulfurization wastewater discharged from the desulfurization tower is less than or equal to 20mg/L after pre-precipitation treatment.
The rest of the structure is the same as in example 1.
Example 3
As shown in fig. 5, in this embodiment, a flue gas waste heat exchanger 1 is installed through a flue 2 in front of a desulfurization tower behind a dust remover, and in this embodiment, 14 flue gas waste heat exchangers are installed in parallel, and the heat exchangers are bundle type tube type heat exchangers installed vertically. The heat exchange tube 23 is made of 2205 dual-phase steel.
The desulfurization wastewater in this embodiment is a mixed wastewater of desulfurization wastewater, concentrated water of a reverse osmosis system of a power plant, regenerated wastewater of an ion exchange system, and concentrated drainage water of an acid/alkali washing system, and before entering the concentration device 3, the wastewater is treated by the precipitation device 31, so that insoluble solids contained in the wastewater are controlled to be 10000-20000 mg/L.
A coagulant aid dosing device is arranged in the embodiment, and scale inhibitor is added into the system through a dosing port 7, wherein the dosing amount is 20-50 mg/L. The dosing port 7 is arranged at the rear end of the precipitation device 31 (the dosing port 7 is not arranged on the pipeline between the inlet of the flue gas waste heat exchanger 1 and the outlet of the concentration device 3).
The circulating pump 4 can be a circulating pump with two sets of running, one set of running is standby, and the flow is 600-800m3/h
The rest of the structure is the same as in example 1.
Example 4
In the embodiment, the flue gas waste heat exchanger 1 is installed on the front flue 2 of the desulfurizing tower in a penetrating manner, 20 groups of flue gas waste heat exchangers are arranged in parallel, 10 bunched tubular heat exchangers are arranged in each group, and the installation mode is vertical installation. The heat exchange tube 23 is made of polytetrafluoroethylene. A density detection device 301 is also arranged on the pipeline between the inlet of the flue gas waste heat exchanger 1 and the outlet of the concentration device 3.
The desulfurization wastewater in the embodiment is discharged from a desulfurization device, the wastewater is treated by a precipitation device 31 before entering a concentration device 3, a dosing port 7 is arranged at the front end of the precipitation device 31, a flocculating agent is added in an amount of 200-500 mg/L, and insoluble solids in the wastewater are controlled to be less than or equal to 20 mg/L.
In this embodiment, the circulating pump 4 is a circulating pump with two sets of running, one running and one standby, and the flow rate is 2000-3000 m3/h。
The rest of the structure is the same as in example 1.
Claims (8)
1. A heat exchange device for desulfurization wastewater and flue gas waste heat is characterized in that a flue (2) is connected with a plurality of flue gas waste heat exchangers (1) and a concentration device (3), an inlet of each flue gas waste heat exchanger (1) is connected with an outlet of the concentration device (3) through a pipeline, and an outlet of each flue gas waste heat exchanger (1) is connected with an inlet of the concentration device (3) through a pipeline; the inlet pipeline of the concentration device (3) is provided with a temperature detection device (14); the circulating pump (4) is arranged on a pipeline between the inlet of the flue gas waste heat exchanger (1) and the outlet of the concentration device (3), and the pipeline is also provided with a pressure detection device (13), a temperature detection device (14), a flow detection device (15), a washing water gap (5) and a drain hole (6);
the concentration device (3) is provided with a fluid infusion port (11).
2. The desulfurization waste water and flue gas waste heat exchange device according to claim 1, wherein the flue gas waste heat exchanger (1) is provided with an upper half fixing device and a lower half fixing device, an outlet pipe (18) is arranged at the top of the upper half fixing device to form an outlet of the flue gas waste heat exchanger (1), an inlet pipe (28) is arranged at the bottom of the lower half fixing device to form an inlet of the flue gas waste heat exchanger (1), a plurality of longitudinally arranged heat exchange pipes (23) are arranged between the upper half fixing device and the lower half fixing device, the heat exchange pipes (23) are surrounded by a binding device (29), and a longitudinal support framework (30) is arranged inside the heat exchange pipes.
3. The desulfurization wastewater and flue gas waste heat exchange device of claim 2, wherein the heat exchange tube (23) is made of ND steel, dual-phase steel 2205, dual-phase steel 2507, titanium alloy, polytetrafluoroethylene or ND steel lined with silicon carbide.
4. The desulfurization waste water and flue gas waste heat exchange device of claim 2, wherein the upper half fixing device comprises an upper end enclosure (19), an upper flange (20), an upper neck pipe (21) and an upper fixing plate (22) from top to bottom, and the lower half fixing device comprises a lower fixing plate (24), a lower neck pipe (25), a lower flange (26) and a lower end enclosure (27) from top to bottom; the flue gas waste heat exchanger (1) penetrates through a top plate and a bottom plate of the flue (2) and is respectively connected with the top plate and the bottom plate of the flue (2) in a sealing mode through an upper fixing plate (22) and a lower fixing plate (24).
5. The desulfurization waste water and flue gas waste heat exchange device according to claim 1, wherein a chemical feeding port (7) is further provided on the pipeline between the inlet of the flue gas waste heat exchanger (1) and the outlet of the concentration device (3).
6. The heat exchange device for the desulfurization wastewater and the flue gas waste heat according to claim 1 or 5, wherein a precipitation device (31) is arranged at the front end of the fluid infusion port (11), and a chemical feeding port (7) is arranged at the front end or the rear end of the precipitation device (31).
7. The desulfurization waste water and flue gas waste heat exchange device according to claim 1, wherein a density detection device (301) is further disposed on the pipeline between the inlet of the flue gas waste heat exchanger (1) and the outlet of the concentration device (3).
8. The desulfurization waste water and flue gas waste heat exchange device of claim 1, wherein the inlet and outlet pipelines at both ends of the flue gas waste heat exchanger (1) are provided with cut-off valves (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021316942.8U CN212482227U (en) | 2020-07-07 | 2020-07-07 | Heat exchange device for desulfurization wastewater and flue gas waste heat |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021316942.8U CN212482227U (en) | 2020-07-07 | 2020-07-07 | Heat exchange device for desulfurization wastewater and flue gas waste heat |
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| CN212482227U true CN212482227U (en) | 2021-02-05 |
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| CN202021316942.8U Active CN212482227U (en) | 2020-07-07 | 2020-07-07 | Heat exchange device for desulfurization wastewater and flue gas waste heat |
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