CN219346475U - Desalted water heating system for low-temperature flue gas waste heat utilization of garbage incinerator - Google Patents
Desalted water heating system for low-temperature flue gas waste heat utilization of garbage incinerator Download PDFInfo
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- CN219346475U CN219346475U CN202320222383.1U CN202320222383U CN219346475U CN 219346475 U CN219346475 U CN 219346475U CN 202320222383 U CN202320222383 U CN 202320222383U CN 219346475 U CN219346475 U CN 219346475U
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The utility model relates to the technical field of energy-saving equipment of a garbage incinerator, and particularly discloses a desalted water heating system for utilizing low-temperature flue gas waste heat of the garbage incinerator, wherein the low-temperature flue gas purified by a flue gas purification treatment system is utilized for waste heat recovery, and the recovered heat is used for heating desalted water to replace external energy for heating, so that the heat efficiency is improved; the low-temperature flue gas heat exchanger is improved in a plurality of positions, so that the technical problems of large flue gas temperature fluctuation, blockage and corrosion of flue gas dust to the low-temperature flue gas heat exchanger and the like are solved.
Description
Technical Field
The utility model relates to the technical field of energy-saving equipment of garbage incinerators, in particular to a desalted water heating system for utilizing low-temperature flue gas waste heat of the garbage incinerators.
Background
At present, a common incineration flue gas purification treatment system for household garbage incineration projects in China adopts a combined process of SNCR, semi-dry deacidification, activated carbon adsorption and bag dust removal, the flue gas exhaust temperature after the purification treatment of the system is generally 140-160 ℃, the flue gas in the temperature range still carries a large amount of waste heat, and the exhaust gas loss is one of the larger energy losses. If discharged directly, energy waste is caused. Therefore, if the waste heat in the low-temperature flue gas can be recycled, the heat efficiency of the garbage incineration power plant can be effectively improved.
On the other hand, the rest of heat boilers in the garbage incineration power generation project need to periodically and quantitatively supplement desalted water with a certain temperature and a large amount of heat energy, and the current desalted water supplement is to heat the desalted water from room temperature to the inlet required temperature through steam of a steam turbine.
At present, the flue gas waste heat recycling for the garbage incineration power generation project is to recycle energy by using a heat exchanger before the flue gas is processed by the combined process of SNCR+semi-dry deacidification+dry deacidification+activated carbon adsorption+bag dust removal, and the flue gas at 200 ℃ can be utilized, but the temperature fluctuation of the flue gas is large, the dust content is high, and the heat exchanger is easy to block and corrode.
Disclosure of Invention
The utility model aims to provide a demineralized water heating system for low-temperature flue gas waste heat utilization of a garbage incinerator, which utilizes low-temperature flue gas purified by a flue gas purification treatment system to perform waste heat recovery, and the recovered heat is used for heating demineralized water to replace external energy heating, so that the heat efficiency is improved; the low-temperature flue gas heat exchanger is improved in a plurality of positions, so that the technical problems of large flue gas temperature fluctuation, blockage and corrosion of flue gas dust to the low-temperature flue gas heat exchanger and the like are solved.
To achieve the purpose, the utility model adopts the following technical scheme.
A demineralized water heating system for utilizing low-temperature flue gas waste heat of a garbage incinerator comprises a waste heat boiler, a demineralized water workshop, a chimney, a deacidification tower, a carbon adsorption box, a cloth bag dust remover and a low-temperature flue gas heat exchanger.
The low-temperature flue gas heat exchanger consists of an inlet flue, a heat exchange flue and an outlet flue, wherein the inlet flue and the outlet flue are square reducing pipes, a wide-diameter pipe orifice of the inlet flue is connected with a pipe orifice at one end of the heat exchange flue, and a small-diameter pipe orifice of the inlet flue is connected with the output end of the bag-type dust collector; and the wide-diameter pipe orifice of the outlet flue is connected with the pipe orifice at the other end of the heat exchange flue. And the small-diameter pipe orifice of the outlet flue is connected with the input end of the chimney.
A plurality of groups of U-shaped heat exchange tubes are arranged in the heat exchange flue, the water inlets of the U-shaped heat exchange tubes are arranged on the upper surface of the heat exchange flue close to one end of the outlet flue, and the water outlets of the U-shaped heat exchange tubes are arranged on the upper surface of the heat exchange pipeline close to one end of the inlet flue.
The water inlet of the U-shaped heat exchange tube is connected with the output end of the desalted water workshop, and the water outlet of the U-shaped heat exchange tube is connected with the input end of the waste heat boiler.
Furthermore, a flushing pipeline is also arranged in the heat exchange flue, and the flushing pipeline is arranged at the pipe orifices at the two ends of the heat exchange flue and the inner pipe wall of the heat exchange pipeline.
The deacidification tower comprises a deacidification tower water tank and a deacidification tower cleaning water tank, and a flushing pipeline water inlet is connected with the output end of the deacidification tower water tank.
Furthermore, the flushing pipeline is provided with a plurality of flushing spray heads, and the directions of the flushing spray heads are aligned with the U-shaped heat exchange tube.
Furthermore, a flushing fluid collecting bucket is arranged at the bottom of the heat exchange flue, and a water outlet of the flushing fluid collecting bucket is connected with the input end of the deacidification tower cleaning water tank.
Furthermore, the inlet flue and the outlet flue are provided with a plurality of pressure gauges and temperature gauges with remote transmission functions.
Furthermore, a variable-frequency water pump is arranged between the water inlet of the U-shaped heat exchange tube and the output end connecting pipeline of the demineralized water workshop.
The utility model has the beneficial effects that.
1. And the low-temperature flue gas purified by the flue gas purification treatment system is utilized for waste heat recovery, and the recovered heat is used for heating desalted water to replace external energy for heating, so that the heat efficiency is improved.
2. The low-temperature flue gas heat exchanger is improved in a plurality of positions, so that the technical problems of large flue gas temperature fluctuation, blockage and corrosion of flue gas dust to the low-temperature flue gas heat exchanger and the like are solved.
3. And water for flushing the low-temperature flue gas heat exchanger is recycled to the cleaning water tank of the deacidification tower and is used for cleaning the deacidification tower again, so that sewage recycling is realized.
Drawings
Fig. 1 is a schematic view of the overall structure of an embodiment of the low temperature flue gas heat exchanger according to the present utility model.
FIG. 2 is a process flow diagram of a desalted water heating system for low-temperature flue gas waste heat utilization of a garbage incinerator.
The device comprises an inlet flue 1, a heat exchange flue 2, an outlet flue 3, a U-shaped heat exchange pipe 4, a flushing pipeline 5, a flushing nozzle 6, a flushing liquid collecting hopper 7, a pressure gauge 8, a thermometer 9 and a variable-frequency water pump 10.
Detailed Description
The technical scheme of the utility model is further described below with reference to the accompanying drawings and the specific embodiments.
A demineralized water heating system for utilizing low-temperature flue gas waste heat of a garbage incinerator comprises a waste heat boiler, a demineralized water workshop, a chimney, a deacidification tower, a carbon adsorption box, a cloth bag dust remover and a low-temperature flue gas heat exchanger.
The low-temperature flue gas heat exchanger consists of an inlet flue 1, a heat exchange flue 2 and an outlet flue 3, wherein the inlet flue 1 and the outlet flue 3 are square reducer pipes, a wide-diameter pipe orifice of the inlet flue 1 is connected with a pipe orifice at one end of the heat exchange flue 2, and a small-diameter pipe orifice of the inlet flue 1 is connected with the output end of the bag-type dust collector; the wide-diameter pipe orifice of the outlet flue 3 is connected with the pipe orifice at the other end of the heat exchange flue 2. The small-diameter pipe orifice of the outlet flue 3 is connected with the input end of the chimney.
A plurality of groups of U-shaped heat exchange tubes 4,U type heat exchange tubes 4 are arranged in the heat exchange flue 2, water inlets of the U-shaped heat exchange tubes 4 are arranged on the upper surface of the heat exchange flue 2 close to one end of the outlet flue 3, and water outlets of the U-shaped heat exchange tubes 4 are arranged on the upper surface of the heat exchange pipeline 2 close to one end of the inlet flue 3.
As shown in figure 1, the desalted water enters from the upper surface of the U-shaped heat exchange tube 4 and exits from the upper surface, so that the heat exchange distance of the desalted water in the heat exchange flue 2 is increased to the greatest extent, and the water flow in the horizontal direction and the flue gas flow are reversely arranged, so that the desalted water and the low-temperature flue gas are fully contacted and heat exchanged, the low-temperature flue gas can be reduced from 140 ℃ to 120 ℃, the desalted water is heated from 20 ℃ to 80 ℃, and the water temperature requirement of the desalted water entering the waste heat boiler is met.
The water inlet of the U-shaped heat exchange tube 4 is connected with the output end of the desalted water workshop, and the water outlet of the U-shaped heat exchange tube 4 is connected with the input end of the waste heat boiler.
Furthermore, a flushing pipeline 5 is also arranged in the heat exchange flue 2, and the flushing pipeline 5 is arranged at the pipe orifices at the two ends of the heat exchange flue 2 and the inner pipe wall of the heat exchange pipeline 2.
The deacidification tower comprises a deacidification tower water tank and a deacidification tower cleaning water tank, and a water inlet of the flushing pipeline 5 is connected with an output end of the deacidification tower water tank.
As shown in fig. 2, the deacidification tower is used as a part of the flue gas purification treatment system, and comprises a deacidification tower water tank and a deacidification tower cleaning water tank, wherein the deacidification tower water tank is mainly used for pulping and spraying into the deacidification tower, and a bypass is led in the deacidification tower water tank and is used as a water source of the flushing pipeline 5.
Furthermore, the flushing pipe 5 is provided with a plurality of flushing nozzles 6, and the directions of the flushing nozzles 6 are aligned with the U-shaped heat exchange pipe 4.
Furthermore, a flushing fluid collecting bucket 7 is arranged at the bottom of the heat exchange flue 2, and a water outlet of the flushing fluid collecting bucket 7 is connected with the input end of the cleaning water tank of the deacidification tower.
As shown in fig. 2, the low-temperature flue gas entering the low-temperature flue gas heat exchanger is purified by the flue gas purification treatment system, so that dust entering the low-temperature flue gas heat exchanger per se is not much, and therefore, the water pollution degree after the U-shaped heat exchange tube 4 is washed is not high, and the water can be stored in a washing water tank of the deacidification tower for reuse in washing the deacidification tower, thereby achieving the maximum utilization of washing water.
Furthermore, the inlet flue 1 and the outlet flue 3 are respectively provided with a plurality of pressure gauges 8 and temperature gauges 9 with remote transmission functions.
Furthermore, a variable-frequency water pump 10 is arranged between the water inlet of the U-shaped heat exchange tube 4 and the output end connecting pipeline of the demineralized water workshop.
As shown in fig. 1 and 2, the pressure gauge 8 and the thermometer 9 are arranged in the inlet flue 1 and the outlet flue 3 and are used for monitoring the running condition of the whole low-temperature flue gas heat exchanger in real time, and meanwhile, the frequency of the variable-frequency water pump 10 in the demineralized water workshop is adjusted according to the monitoring condition to control the demineralized water flow rate, so that the situations of large flue gas volume change and large flue gas temperature fluctuation possibly occurring in the original garbage incineration power generation system are dealt with.
The technical principle of the present utility model is described above in connection with the specific embodiments. The description is made for the purpose of illustrating the general principles of the utility model and should not be taken in any way as limiting the scope of the utility model. Other embodiments of the utility model will be apparent to those skilled in the art from consideration of this specification without undue burden.
Claims (6)
1. The demineralized water heating system for the low-temperature flue gas waste heat utilization of the garbage incinerator comprises a waste heat boiler, a demineralized water workshop, a chimney, a deacidification tower, a carbon adsorption box and a bag-type dust remover, and is characterized by further comprising a low-temperature flue gas heat exchanger;
the low-temperature flue gas heat exchanger consists of an inlet flue, a heat exchange flue and an outlet flue, wherein the inlet flue and the outlet flue are square reducing pipes, a wide-diameter pipe orifice of the inlet flue is connected with a pipe orifice at one end of the heat exchange flue, and a small-diameter pipe orifice of the inlet flue is connected with the output end of the bag-type dust collector; the wide-diameter pipe orifice of the outlet flue is connected with the pipe orifice at the other end of the heat exchange flue, and the small-diameter pipe orifice of the outlet flue is connected with the input end of the chimney;
a plurality of groups of U-shaped heat exchange pipes are arranged in the heat exchange flue, the water inlets of the U-shaped heat exchange pipes are arranged on the upper surface of the heat exchange flue close to one end of the outlet flue, and the water outlets of the U-shaped heat exchange pipes are arranged on the upper surface of the heat exchange pipeline close to one end of the inlet flue;
the water inlet of the U-shaped heat exchange tube is connected with the output end of the desalted water workshop, and the water outlet of the U-shaped heat exchange tube is connected with the input end of the waste heat boiler.
2. The desalted water heating system for utilizing the low-temperature flue gas waste heat of the garbage incinerator according to claim 1, wherein a flushing pipeline is further arranged in the heat exchange flue, and the flushing pipeline is arranged at the pipe orifices at the two ends of the heat exchange flue and the inner pipe wall of the heat exchange pipeline;
the deacidification tower comprises a deacidification tower water tank and a deacidification tower cleaning water tank, and a flushing pipeline water inlet is connected with the output end of the deacidification tower water tank.
3. The demineralized water heating system for utilizing low-temperature flue gas waste heat of a garbage incinerator according to claim 2, wherein the flushing pipeline is provided with a plurality of flushing nozzles, and the directions of the flushing nozzles are aligned with the U-shaped heat exchange tube.
4. The demineralized water heating system for utilizing low-temperature flue gas waste heat of the garbage incinerator according to claim 2, wherein a flushing fluid collecting bucket is arranged at the bottom of the heat exchange flue, and a water outlet of the flushing fluid collecting bucket is connected with an input end of the cleaning water tank of the deacidification tower.
5. The demineralized water heating system for utilizing low-temperature flue gas waste heat of the garbage incinerator according to claim 1, wherein the inlet flue and the outlet flue are provided with a plurality of pressure gauges and thermometers with remote transmission functions.
6. The demineralized water heating system for utilizing low-temperature flue gas waste heat of the garbage incinerator according to claim 1, wherein a variable-frequency water pump is arranged between the water inlet of the U-shaped heat exchange tube and an output end connecting pipeline of the demineralized water workshop.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320222383.1U CN219346475U (en) | 2023-02-15 | 2023-02-15 | Desalted water heating system for low-temperature flue gas waste heat utilization of garbage incinerator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320222383.1U CN219346475U (en) | 2023-02-15 | 2023-02-15 | Desalted water heating system for low-temperature flue gas waste heat utilization of garbage incinerator |
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| Publication Number | Publication Date |
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| CN219346475U true CN219346475U (en) | 2023-07-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202320222383.1U Active CN219346475U (en) | 2023-02-15 | 2023-02-15 | Desalted water heating system for low-temperature flue gas waste heat utilization of garbage incinerator |
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| CN (1) | CN219346475U (en) |
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- 2023-02-15 CN CN202320222383.1U patent/CN219346475U/en active Active
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