CN112393264A - Boiler waste heat recycling system - Google Patents
Boiler waste heat recycling system Download PDFInfo
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- CN112393264A CN112393264A CN202011299848.0A CN202011299848A CN112393264A CN 112393264 A CN112393264 A CN 112393264A CN 202011299848 A CN202011299848 A CN 202011299848A CN 112393264 A CN112393264 A CN 112393264A
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- heat exchange
- moving plate
- filter element
- shell
- supporting plate
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- 239000002918 waste heat Substances 0.000 title claims abstract description 23
- 238000004064 recycling Methods 0.000 title description 9
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 42
- 239000003546 flue gas Substances 0.000 claims abstract description 42
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 40
- 239000000428 dust Substances 0.000 claims abstract description 29
- 239000007789 gas Substances 0.000 claims abstract description 25
- 238000011084 recovery Methods 0.000 claims abstract description 13
- 238000000926 separation method Methods 0.000 claims abstract description 11
- 238000006477 desulfuration reaction Methods 0.000 claims abstract description 10
- 230000023556 desulfurization Effects 0.000 claims abstract description 10
- 239000000463 material Substances 0.000 claims description 23
- 239000010865 sewage Substances 0.000 claims description 22
- 238000007599 discharging Methods 0.000 claims description 6
- 238000005096 rolling process Methods 0.000 claims description 3
- 238000005260 corrosion Methods 0.000 abstract description 4
- 230000007797 corrosion Effects 0.000 abstract description 4
- 238000001914 filtration Methods 0.000 description 17
- 239000002245 particle Substances 0.000 description 12
- 239000007787 solid Substances 0.000 description 8
- 238000000034 method Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- 239000012535 impurity Substances 0.000 description 4
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 238000001179 sorption measurement Methods 0.000 description 3
- XTQHKBHJIVJGKJ-UHFFFAOYSA-N sulfur monoxide Chemical compound S=O XTQHKBHJIVJGKJ-UHFFFAOYSA-N 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 239000003463 adsorbent Substances 0.000 description 2
- 238000009833 condensation Methods 0.000 description 2
- 230000005494 condensation Effects 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229910052815 sulfur oxide Inorganic materials 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 239000002253 acid Substances 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/02—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
- F23J15/022—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material for removing solid particulate material from the gasflow
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/06—Arrangements of devices for treating smoke or fumes of coolers
-
- 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
- F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
- F28D7/16—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged in parallel spaced relation
- F28D7/1607—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged in parallel spaced relation with particular pattern of flow of the heat exchange media, e.g. change of flow direction
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F17/00—Removing ice or water from heat-exchange apparatus
- F28F17/005—Means for draining condensates from heat exchangers, e.g. from evaporators
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
- F28F9/24—Arrangements for promoting turbulent flow of heat-exchange media, e.g. by plates
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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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Fluid Mechanics (AREA)
- Chimneys And Flues (AREA)
Abstract
本发明属于锅炉余热回收利用领域，具体涉及一种锅炉余热回收利用系统。具体技术方案为：包括燃气锅炉、除尘装置、第一换热装置、分离装置、第二换热装置、脱硫脱硝装置和烟囱，其中第二换热装置包括壳体和设置在壳体两端的管板，所述壳体内部设置多个换热管，多个所述换热管两端固定设置在管板上，所述壳体内壁上滑动设置分别由两个电机驱动的第一移动板和第二移动板，所述第一移动板和第二移动板上均设置有与所述换热管匹配的通孔，通过电机驱动所述第一移动板和第二移动板沿所述换热管运动。采用两次换热，充分回收利用烟气中热能，两个移动板在换热管上交替移动能够除掉聚集在换热管表面的冷凝水，避免对换热管造成腐蚀。
The invention belongs to the field of boiler waste heat recovery and utilization, and particularly relates to a boiler waste heat recovery and utilization system. The specific technical scheme is: including a gas boiler, a dust removal device, a first heat exchange device, a separation device, a second heat exchange device, a desulfurization and denitrification device and a chimney, wherein the second heat exchange device includes a shell and pipes arranged at both ends of the shell. A plurality of heat exchange tubes are arranged inside the shell, the two ends of the plurality of heat exchange tubes are fixedly arranged on the tube plate, and the inner wall of the shell is slidably arranged with a first moving plate and The second moving plate, the first moving plate and the second moving plate are both provided with through holes matching the heat exchange tubes, and the first moving plate and the second moving plate are driven by a motor along the heat exchange Tube movement. Two heat exchanges are used to fully recycle the heat energy in the flue gas. The alternate movement of the two moving plates on the heat exchange tube can remove the condensed water accumulated on the surface of the heat exchange tube and avoid corrosion of the heat exchange tube.
Description
Technical Field
The invention belongs to the field of boiler waste heat recycling, and particularly relates to a boiler waste heat recycling system.
Background
The boiler is an energy conversion device which outputs steam or high-temperature hot water having a certain heat energy using gas, coal or the like as fuel. The exhaust gas temperature of the boiler is very high, generally between 160 ℃ and 250 ℃, and the exhaust gas contains a certain amount of water vapor and huge sensible heat and latent heat energy. If the high-temperature flue gas is directly discharged into the atmospheric environment without being utilized, the temperature of the surrounding environment is inevitably increased, and energy waste is caused; meanwhile, the flue gas contains ash, a small amount of oxysulfide and other impurities, and the direct discharge can pollute the air. Therefore, the high-temperature flue gas waste heat is required to be recycled and then discharged into the atmospheric environment.
At present, a boiler waste heat recycling system mainly has two modes, one mode is to arrange a high-pressure or low-pressure heat exchanger in an air preheater, and the other mode is to arrange a heat exchanger behind the air preheater. Wherein, in the heat exchanger system arranged behind the air preheater, the temperature of the flue gas behind the preheater is relatively low, and a larger heat exchange area is required for obtaining better heat exchange efficiency. In the heat exchange process, because the temperature difference between the inner side and the outer side of the heat exchange tube is large, condensed water is easy to appear on the outer side of the heat exchange tube, on one hand, the heat conductivity coefficient of a heat exchange surface is reduced due to dew condensation on the surface of the heat exchange tube, and therefore the overall heat exchange efficiency of the heat exchanger is reduced; on the other hand, the condensed water absorbs acid and alkali substances in the flue gas, so that the corrosion problem of the heat exchange tube is caused. The current general solution is to coat a layer of anticorrosive coating on the surface of the heat exchange tube, which often reduces the heat exchange efficiency of the heat exchange tube.
The high-temperature flue gas contains a large amount of ash, and the current solution is to arrange a filter element with single filter precision in a filter device, so that the following problems are easy to occur: if a filter element with low filtering precision is adopted, solid particles with smaller particle size cannot be completely removed, and the normal operation of a subsequent device cannot be ensured; if the filter element with high filtering precision is adopted, large-particle impurities contained in the smoke easily block the filter element, and the service life of the filter element is shortened.
Disclosure of Invention
The invention aims to improve the heat exchange efficiency of a heat exchanger in a boiler waste heat recycling system and solve the problem of condensation on the surface of a heat exchange tube, and provides the boiler waste heat recycling system.
In order to achieve the purpose of the invention, the technical scheme adopted by the invention is as follows: a boiler waste heat recycling system comprises a gas boiler and a chimney, wherein a flue gas outlet pipeline of the gas boiler is connected with a dust removal device, an outlet pipeline of the dust removal device is connected with a first heat exchange device, an air outlet of the first heat exchange device is connected with an air inlet of the gas boiler through a pipeline, a flue gas outlet pipeline of the first heat exchange device is connected with a separation device, an outlet pipeline of the separation device is connected with a second heat exchange device, a cold water outlet of the second heat exchange device is connected with a cold water inlet of the gas boiler through a pipeline, a flue gas outlet pipeline of the second heat exchange device is connected with a desulfurization and denitrification device, and an outlet pipeline of the desulfurization and denitrification device is connected with;
the second heat exchange device comprises a shell and tube plates arranged at two ends of the shell, a plurality of heat exchange tubes are arranged inside the shell, two ends of each heat exchange tube are fixedly arranged on the tube plates, a first movable plate and a second movable plate which are driven by two motors respectively are arranged on the inner wall of the shell in a sliding mode, the first movable plate is located above the inner portion of the shell, the second movable plate is located below the inner portion of the shell, through holes matched with the heat exchange tubes are formed in the first movable plate and the second movable plate, and the first movable plate and the second movable plate are driven by the motors to move along the heat exchange tubes.
Preferably: first movable plate and second movable plate all include the first backup pad and the second backup pad of the semicircle form that two intervals set up, first backup pad is close to the left side tube sheet, the left side tube sheet is kept away from to the second backup pad, spring coupling is passed through to first backup pad and second backup pad, it has adsorbing material to fill between first backup pad and the second backup pad.
Preferably: two the motor is linear electric motor, linear electric motor's actuating lever is connected with the second backup pad.
Preferably: the side peripheries of the first moving plate and the second moving plate are provided with a plurality of limiting bulges, and grooves corresponding to the limiting bulges are formed in the inner wall of the shell.
Preferably: the side periphery of the first moving plate and the upper portion of the second moving plate are provided with baffles, the baffles are fixedly connected with the first supporting plate and attached to the second supporting plate, and limiting blocks are arranged on one sides, close to the second supporting plate, of the baffles.
Preferably: one side that the casing left side tube sheet is close to the casing inside is provided with first dirt discharging groove, first dirt discharging groove set up in the tube sheet middle part.
Preferably: a second sewage draining groove is arranged below the first sewage draining groove and used for draining water drained from the first sewage draining groove and/or the second moving plate, and a sewage draining outlet is formed in the bottom of the second sewage draining groove.
Preferably: the dust removal device comprises a cylinder and a multi-stage filter element arranged in the cylinder, the multi-stage filter element is arranged with a central shaft, a first filter element is arranged at the position closest to the central shaft, the upper end of the first filter element is communicated with an inlet of the dust removal device, a second filter element is arranged at the position farthest from the central shaft, and the lower end of the second filter element is communicated with an outlet of the dust removal device; a plurality of third filter elements may be disposed between the first and second filter elements.
Preferably: the first filter element has a filter fineness of 10 microns, the second filter element has a filter fineness of 1 micron, and the plurality of third filter elements have a filter fineness of 1-10 microns.
Preferably: the multistage filter element is a cylinder body formed by rolling a wavy filter material.
The invention has the following beneficial effects:
1. the high-temperature flue gas outlet of the boiler is sequentially provided with a dust removal device, a first heat exchange device, a separation device, a second heat exchange device and a desulfurization and denitrification device, and the dust removal device is arranged to remove solid impurities such as ash and slag in the high-temperature flue gas so as to protect the normal use of downstream equipment; firstly, a first heat exchange device is arranged for exchanging heat between high-temperature flue gas at the outlet of a boiler and air at the inlet of the boiler, and then a second heat exchange device is arranged for exchanging heat between the high-temperature flue gas after the first heat exchange and cold water at the inlet of the boiler, so that heat energy in the high-temperature flue gas is fully recycled after the heat exchange for two times; a separating device is arranged behind the first heat exchange device, partial condensed water in the high-temperature flue gas is primarily separated and then enters the second heat exchange device, and the steam fraction in the high-temperature flue gas entering the second heat exchange device is reduced.
2. The first moving plate and the second moving plate which can slide left and right on the heat exchange tube are arranged in the shell of the second heat exchange device, so that the flow velocity of a medium between shell-side tubes can be increased, the turbulence intensity of fluid is enhanced, and the heat exchange efficiency is improved; the adsorption material for water absorption expansion and compression drainage is filled between the first supporting plate and the second supporting plate of the first moving plate and the second moving plate, the contact surfaces of the first moving plate and the second moving plate with the heat exchange tube are the adsorption material, and when the moving plates slide on the heat exchange tube left and right, the adsorption material can adsorb condensed water gathered on the surface of the heat exchange tube, so that the condensed water is prevented from being gathered on the surface of the heat exchange tube for a long time.
Drawings
FIG. 1 is a schematic view of the overall process of the present invention.
Fig. 2 is a schematic view of the overall structure of a second heat exchange device of the present invention.
FIG. 3 is a schematic cross-sectional view of a second heat exchange apparatus A-A of the present invention.
Fig. 4 is a front view of the first moving plate and the second moving plate of the present invention.
Fig. 5 is a left side view of the first moving plate and the second moving plate of the present invention.
FIG. 6 is a schematic view of the dust removing device of the present invention.
FIG. 7 is a top view of the filter element of the dust removing device of the present invention.
In the figure: the device comprises a dust removal device 2, a first heat exchange device 3, a separation device 4, a second heat exchange device 5 and a desulfurization and denitrification device 6;
the device comprises a cylinder 21, a first filter element 22, a second filter element 23, a third filter element 24, a dust removal device inlet 25 and a dust removal device outlet 26;
the device comprises a shell 51, a tube plate 52, a heat exchange tube 53, a first moving plate 54, a second moving plate 55, a first sewage draining groove 57 and a second sewage draining groove 58;
the device comprises a motor 511, a first supporting plate 512, a second supporting plate 513, a linear motor driving rod 514, a limiting protrusion 515, a groove 516, a baffle 517, a limiting block 518 and a sewage draining outlet 519.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Unless otherwise indicated, the technical means used in the examples are conventional means well known to those skilled in the art.
In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, are merely for convenience of description of the present invention, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
The boiler waste heat recycling system shown in fig. 1-7 comprises a gas boiler and a chimney, wherein a high-temperature flue gas outlet pipeline of the gas boiler is connected with a dust removal device 2, an outlet pipeline of the dust removal device 2 is connected with a first heat exchange device 3, and the first heat exchange device 3 is used for heat exchange between air combusted in the gas boiler and high-temperature flue gas at an outlet of the gas boiler, so that the air combusted in the gas boiler is preheated to improve the combustion temperature of the gas boiler. An air outlet of the first heat exchange device 3 is connected with an air inlet of the gas boiler through a pipeline, a flue gas outlet of the first heat exchange device 3 is connected with the separation device 4 through a pipeline, the separation device 4 initially separates condensed water in high-temperature flue gas after the first heat exchange device 3, and water vapor separated out from the high-temperature flue gas after the first heat exchange device 3 is prevented from entering the second heat exchange device 5, so that the heat exchange efficiency of the second heat exchange device 5 is reduced, and even the problem of corrosion is caused.
An outlet pipeline of the separation device 4 is connected with a second heat exchange device 5, the second heat exchange device 5 is used for heat exchange between cold water at an inlet of the gas boiler and the waste heat flue gas after the first heat exchange device 3, the cold water at the inlet of the gas boiler is preheated, and hot water at an expected temperature is obtained by burning less gas. High-temperature flue gas at the outlet of the gas boiler sequentially passes through the first heat exchange device 3 and the second heat exchange device 5 to exchange heat twice, and the heat exchange is respectively carried out with inlet air and inlet cold water of the gas boiler, so that the heat energy in the high-temperature flue gas is fully recycled, and the energy waste is reduced. The cold water outlet of the second heat exchange device 5 is connected with the cold water inlet of the gas boiler through a pipeline, the flue gas outlet of the second heat exchange device 5 is connected with the desulfurization and denitrification device 6 through a pipeline, pollutants such as sulfur oxides, nitric oxides and the like contained in flue gas are removed, and the direct discharge of the substances into the atmosphere is avoided to cause environmental pollution. And finally, an outlet pipeline of the desulfurization and denitrification device 6 is connected with a chimney, and the flue gas is discharged into the atmosphere through the chimney after pollutant removal treatment and heat recovery.
Further, the second heat exchange device 5 includes a shell 51, tube plates 52 disposed at two ends of the shell 51, and a head, and the cross-sectional shape of the shell 51 is preferably circular, but may also be other shapes such as square, rectangle, triangle, etc. A plurality of heat exchange tubes 53 are uniformly arranged in the shell 51, and two ends of the plurality of heat exchange tubes 53 are fixedly arranged on the tube plate 52. It will be understood by those skilled in the art that when the second heat exchange means 5 is operated, the cold water for warming up is taken from the tube side, and the high temperature flue gas for cooling down is taken from the shell side.
Further, the first moving plate 54 and the second moving plate 55 driven by the two motors 511 are slidably disposed on the inner wall of the housing 51, and the power mechanism for driving the first moving plate 54 and the second moving plate 55 is not limited to a motor, but may be other power mechanisms such as an air cylinder and a battery. The first moving plate 54 is located above the inside of the housing 51, and the second moving plate 55 is located below the inside of the housing 51. The first moving plate 54 and the second moving plate 55 are provided with through holes matched with the heat exchange pipe 53, and the first moving plate 54 and the second moving plate 55 are driven by the motor 511 to move along the heat exchange pipe 53. It should be noted that the number of the through holes on the first moving plate 54 and the second moving plate 55 is greater than or equal to the number of the heat exchange tubes 53. The motor 511 drives the first moving plate 54 and the second moving plate 55 to slide back and forth on the heat exchange tube 53, and removes the condensed water accumulated on the heat exchange tube 53, thereby ensuring the heat exchange efficiency of the heat exchange tube 53 while preventing corrosion of the heat exchange tube 53. In order to prevent sulfur oxides and the like contained in the flue gas from dissolving in the condensed water and collecting on the surface of the heat exchange tube together to corrode the heat exchange tube 53, the surface of the heat exchange tube 53 may be coated with an anticorrosive coating, preferably an anticorrosive coating with a relatively high thermal conductivity.
Further, the first moving plate 54 and the second moving plate 55 each include two semicircular first supporting plates 512 and second supporting plates 513 arranged at intervals, and the cross-sectional shapes of the first supporting plates 512 and the second supporting plates 513 are preferably semicircular, but may be other shapes such as square, rectangle, and the like. The first supporting plate 512 is close to the left tube plate 52, the second supporting plate 513 is far away from the left tube plate 52, the first supporting plate 512 and the second supporting plate 513 are connected through springs, and a soft adsorbing material, such as a water-absorbing sponge, a water-absorbing foam and the like, is filled between the first supporting plate 512 and the second supporting plate 513. The adsorbent material swells after absorbing water, and the adsorbed water can be discharged by pressing the adsorbent material. It should be noted that the contact surfaces between the first moving plate 54 and the heat exchange tube 53 and the second moving plate 55 are soft adsorbing materials, rather than being in direct contact with the first supporting plate 512 and the second supporting plate 513, so as to prevent the first supporting plate 512 and the second supporting plate 513 from being in direct contact with the heat exchange tube 53, and the heat exchange tube 53 is not damaged in the sliding process of the first moving plate 54 and the second moving plate 55.
It should be noted that the two motors 511 driving the first moving plate 54 and the second moving plate 55 to move are both linear motors, and the start and stop of the two motors 511 are controlled by a PLC automatic control system. Two motors 511 are fixedly arranged outside the second heat exchange device 5, are convenient to manage and overhaul, and are specifically arranged on an external support close to a left end socket of the second heat exchange device 5. The driving rods 514 of the two motors 511 penetrate through the left tube plate 52 of the second heat exchange device to be fixedly connected with the second supporting plate 513, and the driving rods 514 can freely extend and retract in the shell 51 to drive the first moving plate 54 and the second moving plate 55 to slide on the heat exchange tubes 53.
Further, in order to prevent the first moving plate 54 and the second moving plate 55 from deviating from the sliding path during the sliding process, a plurality of limiting protrusions 515 are disposed on the lateral peripheries of the first moving plate 54 and the second moving plate 55, and a plurality of limiting grooves 516 corresponding to the limiting protrusions 515 are disposed on the inner wall of the housing 51.
It should be noted that, in the process of squeezing the second supporting plate 513 to drain water, in order to avoid water from being drained from the upper portions of the first moving plate 54 and the second moving plate 55, a baffle 517 is disposed on the side periphery of the first moving plate 54 and the upper portion of the second moving plate 55, the baffle 517 is fixedly connected to the first supporting plate 512, the baffle 517 is attached to the second supporting plate 513, and a limiting block 518 is disposed on a side of the baffle 517 close to the second supporting plate 513.
Further, a first sewage discharge groove 57 is provided on the side of the tube plate 52 on the left side of the shell 51 near the inside of the shell 51, and the first sewage discharge groove 57 is provided in the middle of the tube plate 52. It should be noted that the first drain groove 57 is a groove with an upward opening, and the width of the groove is equal to the width of the adsorbing material in the first moving plate 54 after saturated water absorption. When the first moving plate 54 slides to the left end of the heat exchange tube 53, the first moving plate 54 is located right below the first drain tank 57, the first supporting plate 512 of the first moving plate 54 abuts against the left tube plate 52 in the housing 51 and stops, the second supporting plate 513 of the first moving plate 54 presses the adsorbing material under the driving action of the motor 511, and water in the adsorbing material flows out from the bottom end of the first moving plate 54 and enters the first drain tank 57 located right below the first moving plate 54. Subsequently, the first moving plate 54 starts to slide rightward by the driving of the motor 511, the spring in the first moving plate 54 is gradually restored, and the adsorbing material returns to the original state. Preferably, the first drain tank 57 is inclined from the horizontal center line of the left tube sheet 52 by 5 to 10 degrees in order to drain the water of the first drain tank 57 more quickly.
Further, a second sewage draining groove 58 is provided below the first sewage draining groove 57, the second sewage draining groove 58 is used for draining water drained from the first sewage draining groove 57 and/or the second moving plate 55, and a sewage draining outlet 519 is provided at the bottom of the second sewage draining groove 58. It should be noted that the second dirt discharging groove 58 is a semicircular groove with an upward opening, and the width of the groove is equal to the width of the adsorbing material in the second moving plate 55 after the adsorbing material is saturated and absorbs water and the width of the groove of the first dirt discharging groove 57. When the second moving plate 55 slides to the left end of the heat exchanging pipe 53, the first supporting plate 512 of the second moving plate 55 abuts against the left tube plate 52 in the housing 51 and stops, the second supporting plate 513 of the second moving plate 55 presses the adsorbing material under the driving action of the motor 511, and water in the adsorbing material flows out from the bottom end of the second moving plate 55 and enters the first drain tank 57 located right below the second moving plate 55. Subsequently, the second moving plate 55 starts to slide rightward by the driving of the motor 511, the spring in the second moving plate 55 is gradually restored, and the adsorbing material returns to the original state.
Further, the operation of the first moving plate 54 and the second moving plate 55: the first moving plate 54 and the second moving plate 55 alternately and intermittently move, and when the first moving plate 54 slides, the second moving plate 55 is positioned at the left side of the shell 51 and keeps still; when the second moving plate 55 slides, the first moving plate 54 remains stationary on the left side of the housing 51.
When the heat exchanger is started, the motor 511 drives the first moving plate 54 to move rightwards on the heat exchange tube 53, and after the first moving plate 54 moves to the rightmost end of the shell 51, the turning direction starts to move leftwards on the heat exchange tube 53; when the first moving plate 54 moves to the leftmost end of the housing 51, the first supporting plate 512 of the first moving plate 54 abuts against the tube plate 52, the second supporting plate 513 continues to move leftwards to press the adsorbing material, so that the condensed water adsorbed in the adsorbing material is discharged, the discharged water flows into the second drain groove 58 through the first drain groove 57 and is discharged from the drain outlet 519, and the second moving plate 55 is kept still in the whole process. Then, the first moving plate 54 is kept stationary, and the motor 511 drives the second moving plate 55 to slide on the heat exchanging pipe 53, thereby achieving the same operation as the first moving plate 54. The first moving plate 54 and the second moving plate 55 alternately slide to wipe off the condensed water accumulated on the heat exchanging pipe 53, thereby ensuring the heat exchanging efficiency of the heat exchanging pipe 53 and preventing the heat exchanging pipe 53 from being corroded.
In order to protect downstream equipment such as the first heat exchange device 3, the separation device 4, the second heat exchange device 5, the desulfurization and denitrification device 6, prolong the service life of the filter element of the dust removal device 2 and improve the filtration efficiency of the dust removal device 2, the preferred embodiment is that the filter elements with different filtration precisions can be arranged in the dust removal device 2, and the specific embodiment is as follows: the dust removing device 2 comprises a cylinder 21 and a multi-stage filter element vertically arranged in the cylinder 21, the multi-stage filter element is arranged with a central shaft, a first filter element 22 is arranged at the position closest to the central shaft, and the upper end of the first filter element 22 is communicated with an inlet 25 of the dust removing device; the second filter element 23 is arranged at the position farthest from the central shaft, and the lower end of the second filter element 23 is communicated with an outlet 26 of the dust removing device; a plurality of third filter elements 24 are arranged between the first filter element 22 and the second filter element 23.
Further, in order to improve the filtering efficiency of the dust removing device 2, the multistage filter element is a cylindrical body formed by rolling a wave-shaped filter material. After the high-temperature flue gas enters the filter element, the moving direction of solid particles in the high-temperature flue gas is irregular, so that the collision probability of the solid particles and the filter element is increased, and solid particle impurities in the high-temperature flue gas can be effectively removed.
It should be noted that the spatial region formed by the first filter element 22 is a first filter region, the spatial region formed between the first filter element 22 and the third filter element 24 is a second filter region, the spatial region formed between the third filter element 24 and the second filter element 23 is a third filter region, and the spatial region formed between the second filter element 23 and the cylinder 21 is a fourth filter region.
Further, the first filter element 22, the third filter element 24 and the second filter element 23 have different filtering accuracies, and the filtering accuracies thereof gradually increase in order. For example, the first filter element 22 may have a filtration accuracy of 10 microns, the third filter element 24 may have a filtration accuracy of 5 microns, and the second filter element 23 may have a filtration accuracy of 1 micron. The high-temperature flue gas enters a first filtering area from an inlet 25 of the dust removal device, and solid particles with the particle size of more than 10 microns in the high-temperature flue gas are removed after being filtered by a first filtering element 22; then the high-temperature flue gas enters a second filtering area, and solid particles with the particle size of more than 5 microns in the high-temperature flue gas are removed after being filtered by a third filtering element 24; then the high-temperature flue gas enters a third filtering area, and solid particles with the particle size of more than 1 micron in the high-temperature flue gas are removed after being filtered by a second filtering element 23; and finally into the fourth filtering section and out of the dust removal device outlet 26.
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various changes, modifications, alterations, and substitutions which may be made by those skilled in the art without departing from the spirit of the present invention shall fall within the protection scope defined by the claims of the present invention.
Claims (10)
1. The utility model provides a boiler waste heat recovery utilizes system, includes gas boiler and chimney, its characterized in that: the flue gas outlet pipeline of the gas boiler is connected with a dust removal device (2), the outlet pipeline of the dust removal device (2) is connected with a first heat exchange device (3), the air outlet of the first heat exchange device (3) is connected with the air inlet of the gas boiler through a pipeline, the flue gas outlet pipeline of the first heat exchange device (3) is connected with a separation device (4), the outlet pipeline of the separation device (4) is connected with a second heat exchange device (5), the cold water outlet of the second heat exchange device (5) is connected with the cold water inlet of the gas boiler through a pipeline, the flue gas outlet pipeline of the second heat exchange device (5) is connected with a desulfurization and denitrification device (6), and the outlet pipeline of the desulfurization and denitrification device (6) is connected with a;
the second heat exchange device (5) comprises a shell (51) and tube plates (52) arranged at two ends of the shell (51), a plurality of heat exchange tubes (53) are arranged inside the shell (51), two ends of each heat exchange tube (53) are fixedly arranged on the tube plates (52), a first moving plate (54) and a second moving plate (55) which are respectively driven by two motors (511) are arranged on the inner wall of the shell (51) in a sliding mode, the first moving plate (54) is located above the inside of the shell (51), the second moving plate (55) is located below the inside of the shell (51), through holes matched with the heat exchange tubes (53) are formed in the first moving plate (54) and the second moving plate (55), and the first moving plate (54) and the second moving plate (55) are driven by the motors (511) to move along the heat exchange tubes (53).
2. The boiler waste heat recovery and utilization system according to claim 1, characterized in that: the first moving plate (54) and the second moving plate (55) respectively comprise a first supporting plate (512) and a second supporting plate (513) which are arranged at intervals and are semicircular, the first supporting plate (512) is close to a left tube plate, the second supporting plate (513) is far away from the left tube plate, the first supporting plate (512) is connected with the second supporting plate (513) through springs, and adsorbing materials are filled between the first supporting plate (512) and the second supporting plate (513).
3. The boiler waste heat recovery and utilization system according to claim 2, characterized in that: the two motors (511) are linear motors, and driving rods (514) of the linear motors are connected with the second supporting plate (513).
4. The boiler waste heat recovery and utilization system according to claim 3, characterized in that: the side peripheries of the first moving plate (54) and the second moving plate (55) are provided with a plurality of limiting protrusions (515), and the inner wall of the shell (51) is provided with grooves (516) corresponding to the limiting protrusions (515).
5. The boiler waste heat recovery and utilization system according to claim 3, characterized in that: the side periphery of the first moving plate (54) and the upper portion of the second moving plate (55) are provided with a baffle (517), the baffle (517) is fixedly connected with the first supporting plate (512), the baffle (517) is attached to the second supporting plate (513), and a limiting block (518) is arranged on one side, close to the second supporting plate (513), of the baffle (517).
6. The boiler waste heat recovery and utilization system according to claim 5, characterized in that: the shell (51) left side tube sheet is close to the inside one side of shell (51) and is provided with first dirt discharging groove (57), first dirt discharging groove (57) set up in tube sheet (52) middle part.
7. The boiler waste heat recovery and utilization system according to claim 6, characterized in that: and a second sewage draining groove (58) is arranged below the first sewage draining groove (57), the second sewage draining groove (58) is used for draining water drained from the first sewage draining groove (57) and/or the second moving plate (55), and a sewage draining outlet (519) is arranged at the bottom of the second sewage draining groove (58).
8. The boiler waste heat recovery and utilization system according to claim 1, characterized in that: the dust removal device (2) comprises a cylinder body (21) and a multi-stage filter element arranged in the cylinder body (21), the multi-stage filter element is arranged with a central shaft, a first filter element (22) is arranged at the position closest to the central shaft, the upper end of the first filter element (22) is communicated with an inlet (25) of the dust removal device, a second filter element (23) is arranged at the position farthest from the central shaft, and the lower end of the second filter element (23) is communicated with an outlet (26) of the dust removal device; a plurality of third filter elements (24) can be arranged between the first filter element (22) and the second filter element (23).
9. The boiler waste heat recovery and utilization system according to claim 1, characterized in that: the first filter element (22) has a filter fineness of 10 microns, the second filter element (23) has a filter fineness of 1 micron, and the plurality of third filter elements (24) have a filter fineness of between 1 and 10 microns.
10. The boiler waste heat recovery and utilization system according to claim 1, characterized in that: the multistage filter element is a cylinder body formed by rolling a wavy filter material.
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| CN202011299848.0A CN112393264A (en) | 2020-11-19 | 2020-11-19 | Boiler waste heat recycling system |
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| CN202011299848.0A CN112393264A (en) | 2020-11-19 | 2020-11-19 | Boiler waste heat recycling system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113566222A (en) * | 2021-07-27 | 2021-10-29 | 无棣县兴亚生物科技有限公司 | Tail gas treatment device and treatment process of gas biomass boiler |
| CN113731110A (en) * | 2021-08-30 | 2021-12-03 | 深圳市民润健康管理有限公司 | A odor gas purifier for meal sediment of meal is taken out in kitchen |
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| CN113731110A (en) * | 2021-08-30 | 2021-12-03 | 深圳市民润健康管理有限公司 | A odor gas purifier for meal sediment of meal is taken out in kitchen |
| CN113731110B (en) * | 2021-08-30 | 2023-11-03 | 湖南蓝箭环保科技有限公司 | Odor purifier for kitchen rice residues |
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