CN213599410U - Fluoroplastic pipe flue gas waste heat recovery system in front of desulfurizing tower - Google Patents
Fluoroplastic pipe flue gas waste heat recovery system in front of desulfurizing tower Download PDFInfo
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- CN213599410U CN213599410U CN202022023441.7U CN202022023441U CN213599410U CN 213599410 U CN213599410 U CN 213599410U CN 202022023441 U CN202022023441 U CN 202022023441U CN 213599410 U CN213599410 U CN 213599410U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/30—Technologies for a more efficient combustion or heat usage
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Abstract
The utility model relates to a fluoroplastics pipe residual heat from flue gas system before desulfurizing tower belongs to the flue gas processing field. The method comprises the following steps: the device comprises a body flue, a fluoroplastic pipe heat exchanger and a circulating water pump unit; the body flue is located between dust remover and the desulfurizing tower, be provided with fluoroplastics pipe heat exchanger in the body flue, fluoroplastics pipe heat exchanger's inlet tube passes through circulating water pump unit and links to each other with outer net return water main pipe, and it links to each other with outer net return water house steward to go out the pipeline end. The system is arranged at a flue between a boiler dust remover and a desulfurizing tower, fully extracts low-temperature flue gas heat at the tail of a boiler, improves the thermal efficiency of a thermal power plant, saves coal consumption, reduces water consumption of a limestone-gypsum wet desulphurization system, and reduces operation and maintenance cost of equipment caused by acid corrosion.
Description
Technical Field
The utility model belongs to the flue gas treatment field, concretely relates to fluoroplastics pipe flue gas waste heat recovery system before desulfurizing tower.
Background
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and is not necessarily to be taken as an acknowledgement or any form of suggestion that this information constitutes prior art that is already known to a person skilled in the art.
At present, the problems of energy and environment are increasingly severe, and the problems become important concerns and urgent needs to be solved in human society. The energy produced in the thermal power industry of China mainly takes coal combustion as main energy. The combustion of coal can generate a large amount of high-temperature flue gas, which causes environmental pollution and energy waste. Investigation has found that 70-80% of the heat loss of coal-fired boilers results from flue gas heat loss; in addition, the flue gas with overhigh temperature can carry a large amount of water vapor when passing through the desulfurization system, thereby increasing the water consumption of the operation of the desulfurization system and causing unnecessary waste. Therefore, how to utilize the recovery of the exhaust heat has great significance for improving the production efficiency and saving energy.
In recent years, most of flue gas waste heat recovery is applied to heat recovery of medium-high temperature flue gas, low-temperature flue gas at the tail part of a boiler is often ignored, and although the range of temperature reduction of the tail flue gas is limited, the flue gas waste heat recovery device has the advantages of large flow, abundant arrangement space, convenience in supporting and hanging and the like, and the application prospect of low-temperature flue gas heat recovery is very huge. Research proves that combustible sulfur in coal generates a large amount of sulfur dioxide when fully combusted, the sulfur dioxide is easily converted into sulfur trioxide under the action of catalytic oxidation, the sulfur trioxide is combined with water vapor in flue gas to generate sulfuric acid vapor, and the acidic vapor can be condensed on the wall surface of equipment at a certain temperature to cause acid corrosion of the equipment, thereby seriously affecting the safe and stable operation of the equipment and increasing the operation and maintenance cost.
Disclosure of Invention
In order to overcome the technical insufficiency, the utility model provides a fluoroplastics pipe flue gas waste heat recovery system before desulfurizing tower arranges the flue department between boiler dust remover and desulfurizing tower, fully draws the low temperature flue gas heat of boiler afterbody, improves the thermal efficiency of steam power plant, practices thrift coal consumption, reduces lime stone-gypsum wet flue gas desulfurization system water consumption, reduces the operation maintenance cost that equipment leads to because of acid corrosion.
In order to achieve the technical purpose, the utility model adopts the following technical scheme:
the utility model discloses a first aspect provides a fluoroplastics pipe waste heat from flue gas system before desulfurizing tower, include: the device comprises a body flue, a fluoroplastic pipe heat exchanger and a circulating water pump unit; the body flue is located between dust remover and the desulfurizing tower, be provided with fluoroplastics pipe heat exchanger in the body flue, fluoroplastics pipe heat exchanger's inlet tube passes through circulating water pump unit and links to each other with outer net return water main pipe, and it links to each other with outer net return water house steward to go out the pipeline end.
The utility model discloses a body flue guide boiler flue gas flow direction adopts fluoroplastics heat exchanger to retrieve boiler afterbody low temperature flue gas heat, improves outer net return water temperature, adopts circulating water pump unit to circulate outer net return water pressurization, directly transmits flue gas waste heat energy for self process flow and carries out hot water production, has improved the thermal power plant thermal efficiency, has reduced the consumption of the primary energy, has realized the step utilization of the energy.
Simultaneously, the afterbody exhaust gas temperature to active service coal fired power plant generally is less than flue gas acid dew point, consequently, the utility model discloses a low temperature flue gas waste heat recovery system selects the material that acid corrosion resistance is in order to reduce the operation maintenance cost.
The beneficial effects of the utility model reside in that:
(1) waste heat recovery system arrange before the desulfurizing tower, reduced the former flue gas temperature of desulfurizing tower, reduced the interior water evaporation capacity of tower, not only reduced the operation moisturizing volume, and increased the solubility of sulfur dioxide in the desulfurizing tower in the thick liquid, promoted going on of desulfurization reaction, reduced desulfurization environmental protection cost.
(2) The utility model discloses a fluoroplastics heat exchanger adopts and chooses for use the quality light, and the structure is inseparable, and the fluoroplastics heat exchange tube that the chemical property is stable has avoided acid steam to the low temperature acid corrosion problem of equipment, has reduced the installation and the running cost of system.
(3) The utility model discloses fluoroplastics heat exchanger adopts the heat transfer pipeline modularization to arrange, and not only easy to assemble and maintenance have reduced the heat exchanger to the influence of unit operating characteristic moreover to a certain extent, and the power consumption that the draught fan increased is less relatively.
(4) The utility model discloses a body flue guide boiler flue gas flow direction adopts fluoroplastics heat exchanger to retrieve boiler afterbody low temperature flue gas heat, improves outer net return water temperature, adopts circulating water pump unit to circulate outer net return water pressurization, directly transmits flue gas waste heat energy for self process flow and carries out hot water production, has improved the thermal power plant thermal efficiency, has reduced the consumption of the primary energy, has realized the step utilization of the energy.
(5) The utility model has the advantages of simple structure, convenient operation, practicality are strong, easily promote.
Drawings
The accompanying drawings, which form a part of the specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without unduly limiting the scope of the invention.
Fig. 1 is a schematic diagram of the position arrangement of the flue gas waste heat recovery system of the present invention, wherein, 1, a boiler, 2, an air preheater, 3, a dust remover, 4, a waste heat utilization device, 5, a desulfurizing tower, and 6, a chimney;
fig. 2 is the structural schematic diagram of the flue gas waste heat recovery system of the utility model, wherein, a, compressed air mother pipe comes, b, compressed air (0.5-0.8MPa), c, overhaul and sweep usefulness, d, heat exchanger sparge water (0.2-0.3MPa), e, flue gas inlet (110 ℃), f, flue gas outlet (70 ℃), g, flue blowdown, h, heat supply network water booster pump, i, heat supply network water return (55 ℃), j, heat supply network water incoming water (45 ℃), k fluoroplastics heat exchanger.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the invention. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
For convenience of description, the words "upper", "lower", "left" and "right" in the present application, if any, merely indicate that the device or element referred to in the present application is constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention, since they are merely intended to be oriented in the upper, lower, left and right directions of the drawings themselves, and not to limit the structure, but merely to facilitate the description of the invention and to simplify the description.
The terms "mounted", "connected" and "fixed" in the present invention should be understood in a broad sense, for example, they may be fixedly connected, detachably connected, or integrated; the two components can be connected mechanically or electrically, directly or indirectly through an intermediate medium, or connected internally or in an interaction relationship, and specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
A fluoroplastic pipe flue gas waste heat recovery system in front of a desulfurizing tower comprises a flue gas heat exchange system and a circulating water pump unit. The flue gas heat exchange system comprises a body flue, a fluoroplastic pipe heat exchanger and a heat exchanger flushing system; the body flue is arranged at a flue between the boiler dust collector and the desulfurizing tower, an inlet of the body flue is connected with a clean flue gas outlet flue of the bag-type dust collector, and an outlet of the body flue is connected with an original flue gas inlet flue of the desulfurizing tower; the water inlet pipeline end of the fluoroplastic pipe heat exchanger is connected with an outer net water return main pipeline through a circulating water pump unit, and the water outlet pipeline end is connected with an outer net water return main pipeline; the circulating water pump unit is arranged at a water inlet pipeline of the fluoroplastic pipe heat exchanger, one end of the circulating water pump unit is connected with the fluoroplastic pipe heat exchanger, the other end of the circulating water pump unit is connected with the outer net pavement structure water return header pipe, outer net return water is conveyed to the fluoroplastic pipe heat exchanger in a pressurized mode, and the outer net return water is returned to the outer net return header pipe after being heated and warmed.
In some embodiments, the heat exchanger flushing system is arranged in a flue of the body, flushing water used by the heat exchanger flushing system is connected with a flushing water system of the desulfurizing tower, the flushing system ensures that the flushing water can reach each position where scaling is easy to form, and directly flushes the outer wall of the fluoroplastic heat exchanger pipeline, and the flushing water after flushing can enter a pit of the desulfurizing tower.
In some embodiments, the outlet and the inlet of the body flue are respectively provided with an in-situ thermometer, a differential pressure transmitter, a temperature transmitter, a flowmeter and the like.
In some embodiments, the fluoroplastic pipe heat exchanger is a pipe heat exchanger, and the fluoroplastic pipe heat exchanger is made of a material having the characteristics of excellent corrosion resistance, excellent temperature resistance (long-term use temperature is-80-260 ℃), excellent heat conductivity, high strength, high impermeability, better wear resistance and light weight. (the selected range is polytetrafluoroethylene (abbreviated as PTFE), polyvinylidene chloride (abbreviated as PVDF), tetrafluoroethylene-perfluoroalkyl ethylene copolymer (abbreviated as PFA) and polyperfluorinated ethylene propylene (abbreviated as FEP), etc.).
In some embodiments, the fluoroplastic pipe heat exchanger adopts a modular arrangement, the heat exchange pipe is divided into a plurality of groups of modules (1-5 groups of modules), and each group of modules has a single group of isolated operation and maintenance conditions.
In some embodiments, the fluoroplastic heat exchanger is provided with a fixing device between the heat exchange tubes, so that the stable distance between the heat exchange tubes is ensured.
In some embodiments, the water inlet pipeline and the water outlet pipeline on both sides of the fluoroplastic heat exchanger are respectively provided with a valve, a pressure transmitter, a pressure gauge, a temperature transmitter, a thermometer, a flowmeter and the like.
In some embodiments, expansion joints, valves and pressure gauges are respectively arranged at two ends of the circulating water pump unit.
In some embodiments, a pressure gauge, a flowmeter, a pressure transmitter and a valve are arranged on the water inlet main pipe of the circulating water pump unit.
The present invention is described in further detail below with reference to specific examples, which are intended to be illustrative of the invention and not limiting.
Example 1:
as shown in fig. 1 and fig. 2, the present embodiment provides a flue gas waste heat recovery system with a fluoroplastic pipe in front of a desulfurization tower, which comprises a flue gas heat exchange system and a circulating water pump unit. The flue gas heat exchange system comprises a body flue, a fluoroplastic pipe heat exchanger k and a heat exchanger flushing system; the body flue is arranged at a flue between the boiler dust collector 3 and the desulfurizing tower 5, the inlet of the body flue is connected with the clean flue gas outlet flue of the bag-type dust collector 3, the outlet of the body flue is connected with the raw flue gas inlet flue of the desulfurizing tower 5, and the outlet and the inlet of the body flue are respectively provided with a local thermometer, a differential pressure transmitter, a temperature transmitter and a flowmeter; the water inlet pipeline end of the fluoroplastic pipe heat exchanger k is connected with an outer net water return main pipeline through a circulating water pump unit, the water outlet pipeline end is connected with the outer net water return main pipeline, and the water inlet pipeline and the water outlet pipeline on the two sides of the fluoroplastic pipe heat exchanger k are respectively provided with a valve, a pressure transmitter, a pressure gauge, a temperature transmitter, a thermometer, a flowmeter and the like; the heat exchanger flushing system is arranged in the flue of the body, and flushing water used by the heat exchanger flushing system is connected with a flushing water system of the desulfurizing tower 5 to flush the outer wall of the fluoroplastic heat exchanger pipeline k; the circulating water pump unit is arranged at a water inlet pipeline of the fluoroplastic pipe heat exchanger k and comprises two circulating water pumps, expansion joints, valves and pressure gauges are arranged on two sides of the circulating water pump unit, and the circulating water pump unit pressurizes and conveys return water of a heat supply network to the fluoroplastic pipe heat exchanger k.
In order to further optimize the embodiment, the fluoroplastic tube heat exchanger k is in modular arrangement, the heat exchange tubes are divided into 3 groups of modules, and each group of modules has a single group of isolated operation and maintenance conditions.
In order to further optimize the embodiment, the fluoroplastic tube heat exchanger k is made of a chemical material which is stable, prepared polytetrafluoroethylene (PTFE for short) is prepared by the process, and the heat exchange tubes are provided with fixing devices, so that the stable distance between the heat exchange tubes is ensured.
In order to further optimize the embodiment, the system further comprises an electric control device, the operation of the circulating water pump unit and the flue gas waste heat recovery system is controlled through the electric control device, the electric control device adopts the prior art, and the application is not praised.
According to the embodiment, the flue gas waste heat recovery system is utilized to absorb heat in flue gas, the heating heat supply network is used for recovering, the temperature of the flue gas entering the desulfurizing tower is reduced to 70 ℃ from 110 ℃, the temperature of return water of the heat supply network is increased to 55 ℃ from 45 ℃, 200 tons of hot water are heated every hour, and the recovered energy is about 8.4 GJ/h. The thermal efficiency of the thermal power plant is improved, the consumption of primary energy is reduced, and the cascade utilization of energy is realized.
It should be noted that the above-mentioned embodiments are only preferred embodiments of the present invention, and the present invention is not limited thereto, and although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that the technical solutions described in the foregoing embodiments can be modified or partially replaced by equivalent solutions. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention. Although the foregoing describes the embodiments of the present invention, it is not intended to limit the scope of the present invention, and those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without inventive work are still within the scope of the present invention.
Claims (10)
1. The utility model provides a fluoroplastics pipe flue gas waste heat recovery system before desulfurizing tower which characterized in that includes: the device comprises a body flue, a fluoroplastic pipe heat exchanger and a circulating water pump unit; the body flue is located between dust remover and the desulfurizing tower, be provided with fluoroplastics pipe heat exchanger in the body flue, fluoroplastics pipe heat exchanger's inlet tube passes through circulating water pump unit and links to each other with outer net return water main pipe, and it links to each other with outer net return water house steward to go out the pipeline end.
2. The system for recovering the waste heat of the flue gas of the fluoroplastic pipe in front of the desulfurization tower as recited in claim 1, wherein a heat exchanger flushing system is further arranged in the flue of the body.
3. The system for recovering the waste heat of the flue gas of the fluoroplastic pipe in front of the desulfurization tower in claim 2, wherein the heat exchanger flushing system is connected with the desulfurization tower flushing system.
4. The system for recovering the flue gas waste heat of the fluoroplastic pipe in front of the desulfurizing tower according to claim 1, wherein a local thermometer, a differential pressure transmitter, a temperature transmitter and a flowmeter are respectively arranged at the outlet and the inlet of the flue of the main body.
5. The system for recovering the waste heat of flue gas of the fluoroplastic pipe in front of the desulfurization tower of claim 1, wherein the fluoroplastic pipe heat exchanger is a pipe heat exchanger.
6. The system for recovering the waste heat of flue gas of the fluoroplastic pipe in front of the desulfurization tower of claim 1, wherein the fluoroplastic pipe heat exchanger is arranged in a modular manner.
7. The system for recovering the waste heat of flue gas of a fluoroplastic pipe in front of a desulfurization tower of claim 6, wherein the heat exchange pipes of the fluoroplastic pipe heat exchanger are divided into a plurality of groups of modules.
8. The system for recovering the waste heat of flue gas of the fluoroplastic pipe in front of the desulfurizing tower of claim 1, wherein the water inlet pipe and the water outlet pipe on both sides of the fluoroplastic pipe heat exchanger are respectively provided with a valve, a pressure transmitter, a pressure gauge, a temperature transmitter, a thermometer and a flowmeter.
9. The flue gas waste heat recovery system of the fluoroplastic pipe in front of the desulfurizing tower according to claim 1, wherein an expansion joint, a valve and a pressure gauge are respectively arranged at two ends of the circulating water pump unit.
10. The system for recovering the flue gas waste heat of the fluoroplastic pipe in front of the desulfurizing tower according to claim 1, wherein a pressure gauge, a flow meter, a pressure transmitter and a valve are arranged on a water inlet main pipe of the circulating water pump unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022023441.7U CN213599410U (en) | 2020-09-15 | 2020-09-15 | Fluoroplastic pipe flue gas waste heat recovery system in front of desulfurizing tower |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022023441.7U CN213599410U (en) | 2020-09-15 | 2020-09-15 | Fluoroplastic pipe flue gas waste heat recovery system in front of desulfurizing tower |
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| CN213599410U true CN213599410U (en) | 2021-07-02 |
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| CN202022023441.7U Active CN213599410U (en) | 2020-09-15 | 2020-09-15 | Fluoroplastic pipe flue gas waste heat recovery system in front of desulfurizing tower |
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| CN (1) | CN213599410U (en) |
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