CN111013361B - Wet flue gas desulfurization low-temperature waste heat utilization and white elimination system - Google Patents
Wet flue gas desulfurization low-temperature waste heat utilization and white elimination system Download PDFInfo
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- CN111013361B CN111013361B CN201911376219.0A CN201911376219A CN111013361B CN 111013361 B CN111013361 B CN 111013361B CN 201911376219 A CN201911376219 A CN 201911376219A CN 111013361 B CN111013361 B CN 111013361B
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- flue gas
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/77—Liquid phase processes
- B01D53/78—Liquid phase processes with gas-liquid contact
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/005—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by heat treatment
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
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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
- F28D21/0001—Recuperative heat exchangers
- F28D21/0014—Recuperative heat exchangers the heat being recuperated from waste air or from vapors
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Environmental & Geological Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
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- General Chemical & Material Sciences (AREA)
- Biomedical Technology (AREA)
- Health & Medical Sciences (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention provides a wet desulphurization flue gas low-temperature waste heat utilization and white elimination system which comprises a spray tower, a flue gas heater, a chimney, a steam pipe, an intermediate water tank and a heat pump, wherein a flue gas inlet is arranged below the left side of the spray tower, the flue gas heater is connected at the outlet of the upper part of the spray tower through a flue, the other end of the flue gas heater is connected with the chimney through the flue, a demister is arranged at the top of the inner side of the spray tower, a flushing pipe and a spray header pipe are connected at the right side of the intermediate water tank, a demister flushing water pump is arranged on the flushing pipe, and an intermediate water circulating pump is arranged on the spray header pipe.
Description
Technical Field
The invention relates to the technical field of flue gas treatment, in particular to a wet desulphurization flue gas low-temperature waste heat utilization and white elimination system.
Background
At present, a large part of the flue gas whitening process adopts a combination of an MGGH system and a condensing system. The MGGH system is a closed circulation system and mainly comprises a flue gas cooler, a flue gas reheater, a heating medium auxiliary heater, a circulating water pump, a pressure stabilizing system, a dosing device, a water flushing system and the like, and the system is multi-type and complex in equipment and process. Flue condensation and thick liquid condensation mode are adopted mostly to the flue gas condensation, and two kinds of processes are open system, and thick liquid condensation effect is not obvious, and flue condensation equipment material requires highly, and the system water consumption is big. The open-cycle condensing system of the booster pump solves the cold source problem of the condensing circulating water by using the cooling tower, and the absorbed heat is not utilized to directly enter the atmospheric environment through the heat exchange between the cooling water and the flue gas.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a wet desulphurization flue gas low-temperature waste heat utilization and white elimination system.
In order to achieve the purpose, the invention provides the following technical scheme to realize the purpose:
a wet desulphurization flue gas low-temperature waste heat utilization and white elimination system comprises a spray tower, a flue gas heater, a chimney, a steam pipe, an intermediate water tank and a heat pump, wherein a flue gas inlet is arranged below the left side of the spray tower, the outlet at the upper part of the spray tower is connected with the flue gas heater through a flue, the other end of the flue gas heater is connected with the chimney through the flue, a demister is arranged at the top of the inner side of the spray tower, a flushing pipe and a spray header are connected with the right side of the intermediate water tank, a demister flushing water pump is arranged on the flushing pipe, an intermediate water circulating pump is arranged on the spray header, nozzles of the flushing pipe are arranged at the upper side and the lower side of the demister, a plurality of spray branch pipes are arranged inside the spray tower and are arranged below the demister, a plurality of nozzles are arranged at the lower parts of the spray branch pipes, the right ends of the spray branch pipes are all connected with the spray header, valves are arranged on the spray branch pipes, and a drain pipe is connected with the bottom of the spray header, the lower end of the drain pipe extends into the intermediary water tank, and the intermediary water tank is connected with a dosing system; one end of the steam pipe is connected with an external steam source, the other end of the steam pipe is connected with a steam condensation water tank, the steam pipe sequentially penetrates through the flue gas heater and the heat pump in the flowing direction of steam, the part of the spraying header pipe is arranged in the heat pump, and the heat pump is provided with a heat exchange pipe.
Preferably, the dosing system comprises a dosing tank, an outlet of the dosing tank is connected with the intermediate water tank through a pipeline, and a dosing pump is arranged on the pipeline.
Preferably, a stirring device is arranged in the intermediate water tank and comprises a stirring motor, a stirring shaft and stirring blades, the stirring shaft is connected with a motor shaft of the stirring motor through a coupler, and the stirring blades are arranged on the stirring shaft.
Preferably, the flue gas heater comprises a flue gas heater body, a flue gas heater inlet and a flue gas heater outlet, the flue gas heater outlet and the flue gas heating inlet are respectively positioned at the left side and the right side of the flue gas heater body and are connected with the flue gas heater body, an upper header and a lower header are respectively arranged above and below the flue gas heater, the upper header and the lower header are connected through an elbow, the lower header at the leftmost side is connected with a steam inlet, the lower header at the rightmost end is connected with a steam outlet, the steam inlet and the steam outlet are connected with a steam pipe, a heat exchange pipe is connected between the upper header and the lower header which correspond to each other up and down, the outer side of the heat exchange pipe is provided with fins, the fins are spirally wound on the periphery of the heat exchange pipe, the left side of the lower part of the flue gas heater body is provided with a water outlet, the right side of the flue gas heater is provided with a first flue gas flow guide pipe and a second flue gas flow guide pipe which are both hollow structures, the second flue gas honeycomb duct is located in the first flue gas honeycomb duct, the cross-section of first flue gas honeycomb duct and second flue gas honeycomb duct is triangle-shaped, first flue gas honeycomb duct inserts from top to bottom from flue gas heater body upper portion, first flue gas honeycomb duct upper portion is connected with first turn-ups, first turn-ups passes through the bolt fastening in flue gas heater body roof, the inside position that is located first flue gas honeycomb duct below of flue gas heater body is equipped with the fixing base, first flue gas honeycomb duct lower extreme inserts in the fixing base, the second flue gas honeycomb duct inserts in the first flue gas honeycomb duct from flue gas heater body lower part by supreme the fixing base down, second flue gas honeycomb duct sub-unit connection has the second turn-ups, the second turn-ups passes through the bolt and links to each other with the fixing base, the inboard of lateral wall all is equipped with the water conservancy diversion piece around the flue gas heater body.
Compared with the prior art, the invention has the beneficial effects that: the spray water enters an intermediate water tank after heat exchange, enters a heat pump under the action of an intermediate water circulating pump to serve as a low-temperature heat source, and is cooled in the heat pump, and then the circulating water returns to the spray tower to be fully contacted with the flue gas, so that a whole set of closed circulating system is completed; the flue gas heater exchanges heat with the condensed flue gas by taking steam as a high-temperature heat source, and the saturated steam after heat exchange can be used as the high-temperature heat source of the heat pump; the heat pump unit takes steam as a high-temperature heat source to drive and operate, extracts heat from spray water, and is used for heating heat supply network water of a power plant or condensed water of a low-pressure heating system.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of the flue gas heater of the present invention;
FIG. 3 is an enlarged schematic view at A in FIG. 2;
FIG. 4 is an enlarged schematic view at B of FIG. 2;
FIG. 5 is a top view of the flue gas heater of the present invention;
figure 6 is a cross-sectional view of a flue gas heater according to the present invention.
Detailed Description
An embodiment of the present invention will be described in detail below with reference to fig. 1.
A wet desulphurization flue gas low-temperature waste heat utilization and white elimination system comprises a spray tower 1, a flue gas heater 3, a chimney 4, a steam pipe 5, an intermediate water tank 9 and a heat pump 21, wherein a flue gas inlet 6 is arranged below the left side of the spray tower 1, the outlet at the upper part of the spray tower 1 is connected with the flue gas heater 3 through a flue 2, the other end of the flue gas heater 3 is connected with the chimney 4 through the flue 2, a demister 7 is arranged at the top of the inner side of the spray tower 1, a flushing pipe 8 and a spray header pipe 15 are connected with the right side of the intermediate water tank 9, a demister flushing water pump 19 is arranged on the flushing pipe 8, an intermediate water circulating pump 20 is arranged on the spray header pipe 15, a spray head of the flushing pipe 8 is arranged at the upper side and the lower side of the demister 7, a plurality of spray branch pipes 16 are arranged inside the spray tower 1, the spray branch pipes 16 are arranged below the demister 7, a plurality of spray nozzles 18 are arranged at the lower part of the spray branch pipes 16, and the right ends of the spray branch pipes 16 are all connected with the spray header pipe 15, valves 17 are arranged on the spray branch pipes 16, the bottom of the spray tower 1 is connected with a drain pipe 10, the lower end of the drain pipe 10 extends into the intermediary water tank 9, and the intermediary water tank 9 is connected with a dosing system 12; one end of the steam pipe 5 is connected with an external steam source, the other end of the steam pipe is connected with a steam condensation water tank 23, the steam pipe 5 sequentially penetrates through the flue gas heater 3 and the heat pump 21 in the flowing direction of steam, the part of the spray header pipe 15 is arranged in the heat pump 21, and the heat exchange pipe 22 is arranged on the heat pump 21.
The dosing system 12 comprises a dosing tank 13, an outlet of the dosing tank 13 is connected with the intermediate water tank 9 through a pipeline, and a dosing pump 14 is arranged on the pipeline.
Be equipped with agitating unit 11 in the intermediary water tank 9, agitating unit 11 includes agitator motor, (mixing) shaft and stirring vane, through the coupling joint between the motor shaft of (mixing) shaft and agitator motor, and stirring vane installs on the (mixing) shaft.
The flue gas heater 3 comprises a flue gas heater body 31, a flue gas heater inlet 33 and a flue gas heater outlet 32, the flue gas heater outlet 32 and the flue gas heating inlet 33 are respectively positioned at the left side and the right side of the flue gas heater body 31 and are connected with the flue gas heater body 31, an upper header 35 and a lower header 34 are respectively arranged above and below the flue gas heater 31, the upper header 35 and the lower header 34 are connected through an elbow 38, the leftmost lower header 34 is connected with a steam inlet 39, the rightmost lower header 34 is connected with a steam outlet 310, the steam inlet 39 and the steam outlet 310 are connected with a steam pipe 5, heat exchange pipes 36 are connected between the upper header 35 and the lower header 34 which correspond to each other up and down, the front heat exchange pipes and the rear heat exchange pipes 36 are arranged in a staggered way, hot steam in the steam pipe 5 enters the heat exchange pipes 36 to exchange heat flue gas flowing through the flue gas heater body 31 to heat the flue gas, the smoke temperature is improved, the smoke lift force is improved, the pollutant dispersion concentration is reduced, the fins 37 are arranged on the outer side of the heat exchange tube 36, the fins 37 are spirally wound on the periphery of the heat exchange tube 36, a water outlet 317 is formed in the left side of the lower portion of the smoke heater body 31, liquid drops in smoke impact and are adsorbed to the surface of the heat exchange tube 36, and the liquid drops flow down along the spiral fins 37 after being collected and fall into the water outlet 317 to be discharged. The right side position of the flue gas heater 31 is provided with a first flue gas guide pipe 311 and a second flue gas guide pipe 313, which are used for shunting flue gas and introducing the flue gas into the area of the heat exchange pipe 36, so that the flue gas can just face the heat exchange pipe 36, liquid drops in the flue gas can collide with the heat exchange pipe 36 more and are adsorbed on the surface of the heat exchange pipe, and the effect of removing the liquid drops is improved. The first flue gas guide pipe 311 and the second flue gas guide pipe 313 are both of a hollow structure, the second flue gas guide pipe 313 is positioned in the first flue gas guide pipe 311, the cross sections of the first flue gas guide pipe 311 and the second flue gas guide pipe 313 are triangular, the first flue gas guide pipe 311 is inserted from the upper part of the flue gas heater body 31 from top to bottom, the upper part of the first flue gas guide pipe 311 is connected with a first flanging 312, the first flanging 312 is fixed on the top wall of the flue gas heater body 31 through bolts, a fixed seat 314 is arranged in the flue gas heater body 31 and positioned below the first flue gas guide pipe 311, the lower end of the first flue gas guide pipe 311 is inserted into the fixed seat 314, the second flue gas guide pipe 313 penetrates through the fixed seat 314 from bottom to top from the lower part of the flue gas heater body 31 and then is inserted into the first flue gas guide pipe 311, the lower part of the second flue gas guide pipe 313 is connected with a second flanging 315, and the second flanging 315 is connected with the fixed seat 314 through bolts, the inner sides of the front and rear side walls of the flue gas heater body 31 are provided with flow guide blocks 316. The first flue gas guide pipe 311 and the second flue gas guide pipe 313 can be independently used for guiding flue gas, so that one of the flue gas heater 3 can be detached for cleaning in the operation process without stopping.
The sewage generated by the intermediate water tank 9 precipitation can enter the original desulfurization wastewater treatment system, and the purified qualified water can be used as process water supplement or other process water supplement of the desulfurization tower.
The heat obtained by the heat exchange between the water in the intermediate water tank 9 and the flue gas is transferred to a hot net water system or a low-pressure heating system of the power plant through a heat pump for heating.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.
Claims (3)
1. The utility model provides a wet flue gas desulfurization low temperature waste heat utilization and white system that disappears which characterized in that: the spray tower comprises a spray tower, a flue gas heater, a chimney, a steam pipe, an intermediate water tank and a heat pump, wherein a flue gas inlet is arranged below the left side of the spray tower, an outlet at the upper part of the spray tower is connected with the flue gas heater through a flue, the other end of the flue gas heater is connected with the chimney through the flue, a demister is arranged at the top of the inner side of the spray tower, a flushing pipe and a spray header pipe are connected to the right side of the intermediate water tank, a demister flushing water pump is arranged on the flushing pipe, an intermediate water circulating pump is arranged on the spray header pipe, nozzles of the flushing pipe are arranged on the upper side and the lower side of the demister, a plurality of spray branch pipes are arranged in the spray tower, the spray branch pipes are arranged below the demister, a plurality of nozzles are arranged at the lower parts of the spray branch pipes, the right ends of the spray branch pipes are all connected with the spray header pipe, valves are arranged on the spray branch pipes, and a drain pipe is connected to the bottom of the spray tower, the lower end of the drain pipe extends into the intermediary water tank, and the intermediary water tank is connected with a dosing system; one end of the steam pipe is connected with an external steam source, the other end of the steam pipe is connected with a steam condensate tank, the steam pipe is sequentially connected with the flue gas heater and the heat pump in the flowing direction of steam, the part of the spray header pipe is arranged in the heat pump, and the heat pump is provided with a heat exchange pipe; the flue gas heater comprises a flue gas heater body, a flue gas heater inlet and a flue gas heater outlet, wherein the flue gas heater outlet and the flue gas heating inlet are respectively positioned at the left side and the right side of the flue gas heater body and are connected with the flue gas heater body, an upper header and a lower header are respectively arranged above and below the flue gas heater, the upper header and the lower header are connected through an elbow, the leftmost lower header is connected with a steam inlet, the rightmost lower header is connected with a steam outlet, the steam inlet and the steam outlet are connected with a steam pipe, heat exchange pipes are connected between the upper header and the lower header which vertically correspond to each other, fin heat exchange pipes are arranged outside the heat exchange pipes, fins are spirally wound on the periphery of the fins, a water outlet is arranged at the left side of the lower part of the flue gas heater body, and a first flue gas guide pipe and a second flue gas guide pipe are arranged at the right side of the flue gas heater, the first flue gas guide pipe and the second flue gas guide pipe are both of hollow structures, the second flue gas guide pipe is positioned in the first flue gas guide pipe, the sections of the first flue gas guide pipe and the second flue gas guide pipe are triangular, the first flue gas guide pipe is inserted from the upper part of the flue gas heater body from top to bottom, the upper part of the first flue gas guide pipe is connected with a first flanging, the first flanging is fixed on the top wall of the flue gas heater body through a bolt, a fixed seat is arranged at the position, below the first flue gas guide pipe, in the flue gas heater body, the lower end of the first flue gas guide pipe is inserted into the fixed seat, the second flue gas guide pipe penetrates through the fixed seat from bottom to top from the lower part of the flue gas heater body and then is inserted into the first flue gas guide pipe, the lower part of the second flue gas guide pipe is connected with a second flanging, and the second flanging is connected with the fixed seat through a bolt, the inner sides of the front side wall and the rear side wall of the flue gas heater body are provided with flow guide blocks.
2. The wet desulphurization flue gas low-temperature waste heat utilization and white elimination system according to claim 1, characterized in that: the medicine feeding system comprises a medicine feeding box, the outlet of the medicine feeding box is connected with the intermediary water tank through a pipeline, and a medicine feeding pump is arranged on the pipeline.
3. The wet desulphurization flue gas low-temperature waste heat utilization and white elimination system according to claim 2, characterized in that: be equipped with agitating unit in the intermediary's water tank, agitating unit includes agitator motor, (mixing) shaft and stirring vane, pass through the coupling joint between (mixing) shaft and the motor shaft of agitator motor, stirring vane installs on the (mixing) shaft.
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CN201911376219.0A CN111013361B (en) | 2019-12-27 | 2019-12-27 | Wet flue gas desulfurization low-temperature waste heat utilization and white elimination system |
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CN201911376219.0A CN111013361B (en) | 2019-12-27 | 2019-12-27 | Wet flue gas desulfurization low-temperature waste heat utilization and white elimination system |
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CN111013361A CN111013361A (en) | 2020-04-17 |
CN111013361B true CN111013361B (en) | 2022-06-10 |
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Citations (7)
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JP2000051648A (en) * | 1998-08-05 | 2000-02-22 | Mitsubishi Heavy Ind Ltd | Method and apparatus for treating exhaust gas |
CN102980171A (en) * | 2011-09-06 | 2013-03-20 | 陈兴元 | Economizer capable of recycling waste heat of flue in depth and concealing, desulfurizing and aspirating flue of coal-fired boiler |
CN208229598U (en) * | 2018-04-23 | 2018-12-14 | 山东省热电设计院 | A kind of wet desulphurization takes off white and residual neat recovering system with flue gas |
CN109045976A (en) * | 2018-08-29 | 2018-12-21 | 航天环境工程有限公司 | A kind of ammonia process of desulfurization flue gas disappears white waste heat depth recovery system and application |
CN109520336A (en) * | 2017-09-16 | 2019-03-26 | 程长春 | A kind of heat exchange of heat pipe |
CN209271165U (en) * | 2018-10-09 | 2019-08-20 | 李申强 | A kind of device for thermal power plant's eliminating white smoke |
CN110307558A (en) * | 2019-06-28 | 2019-10-08 | 中国联合工程有限公司 | A kind of ammonia process of desulfurization tower flue gas disappears white structure and its operation method |
-
2019
- 2019-12-27 CN CN201911376219.0A patent/CN111013361B/en active Active
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2000051648A (en) * | 1998-08-05 | 2000-02-22 | Mitsubishi Heavy Ind Ltd | Method and apparatus for treating exhaust gas |
CN102980171A (en) * | 2011-09-06 | 2013-03-20 | 陈兴元 | Economizer capable of recycling waste heat of flue in depth and concealing, desulfurizing and aspirating flue of coal-fired boiler |
CN109520336A (en) * | 2017-09-16 | 2019-03-26 | 程长春 | A kind of heat exchange of heat pipe |
CN208229598U (en) * | 2018-04-23 | 2018-12-14 | 山东省热电设计院 | A kind of wet desulphurization takes off white and residual neat recovering system with flue gas |
CN109045976A (en) * | 2018-08-29 | 2018-12-21 | 航天环境工程有限公司 | A kind of ammonia process of desulfurization flue gas disappears white waste heat depth recovery system and application |
CN209271165U (en) * | 2018-10-09 | 2019-08-20 | 李申强 | A kind of device for thermal power plant's eliminating white smoke |
CN110307558A (en) * | 2019-06-28 | 2019-10-08 | 中国联合工程有限公司 | A kind of ammonia process of desulfurization tower flue gas disappears white structure and its operation method |
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