CN211781210U - Micro-cyclone flue gas waste heat utilization device - Google Patents
Micro-cyclone flue gas waste heat utilization device Download PDFInfo
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- CN211781210U CN211781210U CN201922302535.5U CN201922302535U CN211781210U CN 211781210 U CN211781210 U CN 211781210U CN 201922302535 U CN201922302535 U CN 201922302535U CN 211781210 U CN211781210 U CN 211781210U
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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 provides a micro-cyclone flue gas waste heat utilization device, which comprises a heat exchanger, wherein the heat exchanger comprises a heat absorption section and a heat release section, the heat absorption section is arranged at the tail part of a flue, and flue gas passes through the heat absorption section and is discharged after heating a medium in the heat absorption section; the heat release section is arranged in an air duct, and air entering the boiler through the air duct passes through the heat release section; the medium is heated by the flue gas and then enters the heat release section to heat the air, and the medium after heat release in the heat release section flows back to the heat absorption section; the medium can form micro-rotational flow when flowing in the pipe cavities of the heat absorption section and the heat release section. The waste heat recovery of the flue gas by adopting the micro-cyclone flue gas waste heat utilization technology reduces the outlet smoke temperature of a boiler flue, heats air by utilizing the recovered waste heat, reduces the fuel consumption of unit yield, and further improves the safe and economic operation of the heating surface at the tail part of the boiler.
Description
Technical Field
The utility model relates to an energy-concerving and environment-protective technical field, in particular to little whirl flue gas waste heat utilization equipment.
Background
As the flue gas discharged by the boiler in operation contains sulfur components with different degrees, the sulfur and other components in the flue gas can form sulfuric acid, so that the low-temperature acid dew corrosion of the heating surface of an air preheater or a heat exchanger of the boiler can be caused, the problems of corrosion, leakage, ash deposition and blockage of the heating surface of the air preheater or the heat exchanger of the boiler and the like can be caused, and the heat efficiency of the boiler and the safe operation of the boiler can be directly influenced. The problems that the temperature of discharged flue gas at an outlet is high, the load of a heating surface at the tail part of a boiler is large, the waste heat of the flue gas cannot be utilized and the like can be caused when the flue gas is directly discharged into the atmosphere, energy conservation and emission reduction are also the primary tasks of each enterprise under the large background of national strong promotion of pollution control and the development of energy conservation and environmental protection industry, and a device capable of efficiently and safely utilizing the waste heat of the flue gas of the boiler is needed.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a little whirl flue gas waste heat utilization equipment adopts the waste heat recovery of little whirl flue gas waste heat utilization technique flue gas, has reduced the export exhaust gas temperature of afterbody heat exchanger to utilize the air of the boiler that the waste heat heating of retrieving got into, reduced the fuel consumption of unit output, further improve the safety of boiler afterbody heated surface, economic operation, owing to used little whirl technique, make indirect heating equipment more high-efficient, also reduced the heat transfer area of equipment simultaneously.
In order to achieve the above object, the present invention provides the following technical solutions:
a micro-cyclone flue gas waste heat utilization device can utilize the waste heat of flue gas in a boiler flue to heat air entering a boiler, and comprises a heat exchanger, wherein the heat exchanger comprises a heat absorption section and a heat release section, the height of the heat release section is higher than that of the heat absorption section, and the peripheries of pipe cavities of the heat absorption section and the heat release section are provided with annular fins; the heat absorption section is arranged at the tail part of the flue, and the flue gas passes through the heat absorption section and is discharged after heating the medium in the heat absorption section; the heat release section is arranged in an air duct, and air entering the boiler through the air duct passes through the heat release section; the medium is heated by the flue gas and then enters the heat release section to heat the air, and the medium after heat release in the heat release section flows back to the heat absorption section; the medium can form micro-rotational flow when flowing in the pipe cavities of the heat absorption section and the heat release section.
Further, in the above device, the device further includes a saturated vapor communicating tube and a condensate water self-return tube, the medium heated by the flue gas enters the heat releasing section through the saturated vapor communicating tube, and the medium subjected to heat release in the heat releasing section returns to the heat absorbing section through the condensate water self-return tube; a first gate valve is arranged on the saturated steam communicating pipe, and a safety valve is connected with the first gate valve; the medium is water.
Further, in the above device, the heat absorbing section and the heat releasing section are both composed of a plurality of heat exchanging units which are vertically parallel and arranged at intervals, the heat exchanging units in the heat absorbing section are arranged perpendicular to the flowing direction of the flue gas, and the heat exchanging units in the heat releasing section are arranged perpendicular to the flowing direction of the air.
Further, in the above apparatus, the heat exchange unit includes an upper main tube bundle, a lower main tube bundle, and a plurality of branch tube bundles communicating the upper main tube bundle and the lower main tube bundle, the upper main tube bundles of the heat exchange units of the heat absorption section are all communicated with one end of the saturated vapor communication tube through a first header tube, and the upper main tube bundles of the heat exchange units of the heat release section are all communicated with the other end of the saturated vapor communication tube through a second header tube;
the lower main tube bundles of the heat exchange units of the heat absorption section are communicated with one end of the condensed water self-return tube through a third header tube, and the lower main tube bundles of the heat exchange units of the heat release section are communicated with the other end of the condensed water self-return tube through a fourth header tube;
in the heat absorption section and the heat release section, the branch pipe bundle is sleeved with a lining perforated pipe, two ends of the lining perforated pipe are welded with two ends of the branch pipe bundle, and the pipe wall of the lining perforated pipe is fully distributed with through holes which are arranged in a rotating manner;
every the periphery of tributary tube bank all has cup jointed a plurality of along tributary tube bank's length direction in proper order annular fin is last to be provided with a plurality of grooves by outside surface extension.
Further, in the above apparatus, the tributary tube bundle has an outer diameter of 38 mm; the outer diameter of the lining perforated pipe is 32mm, the diameter of the through holes is 14mm or 16mm, and the through holes are arranged in a spiral mode.
Further, in the above device, the condensate water self-return pipe includes a horizontal section and a vertical section, the upper end of the vertical section is connected to the heat releasing section, the lower end of the vertical section is connected to one end of the horizontal section, and the other end of the horizontal section is connected to the heat absorbing section.
Further, in the above device, the device further comprises a medium inlet pipe, the medium inlet pipe is communicated with the condensed water self-return pipe, a water injection water meter is arranged on the medium inlet pipe, and two sides of the water injection water meter are respectively provided with a second gate valve.
Further, in the above device, the vertical section includes two branch pipes and a main pipe, upper ends of the two branch pipes are communicated with the heat release section, lower ends of the two branch pipes are converged and then communicated with an upper end of the main pipe, a lower end of the main pipe is communicated with one end of the horizontal section, the other end of the horizontal section is communicated with the heat absorption section, each branch pipe is provided with a third gate valve, and the two third gate valves form a valve group; the valve group is used for adjusting the flow of the condensed water entering the heat absorption section from the medium in the return pipe, so that the wall surface temperature of the heating surface of the heat absorption section is controlled to be above the dew point temperature of the boiler fuel acid.
Further, in the above device, the device further comprises a flue inlet diffusion section and a flue outlet contraction section, the flue inlet diffusion section is arranged at the flue gas inlet side of the heat absorption section, and the flue outlet contraction section is arranged at the flue gas outlet side of the heat absorption section; the device still includes wind channel import diffuser section and wind channel export shrink section, wind channel import diffuser section sets up the air entering side of heat release section, wind channel export shrink section sets up the air discharge side of heat release section.
Further, in the above device, the heat absorption section includes a heat absorption high temperature section and a heat absorption low temperature section, and the flue gas passes through the heat absorption high temperature section and the heat absorption low temperature section in sequence; the heat release section comprises a heat release high-temperature section and a heat release low-temperature section, and air sequentially passes through the heat release low-temperature section and the heat release high-temperature section; two saturated steam communicating pipes are arranged, and two condensate water self-return pipes are arranged; the medium in the heat absorption high-temperature section heated by the flue gas enters the heat release high-temperature section through the saturated steam communicating pipe, and the medium which finishes heat release in the heat release high-temperature section flows back to the heat absorption high-temperature section through the condensate water from the return pipe; and the medium in the heat absorption low-temperature section heated by the flue gas enters the heat release low-temperature section through the other saturated steam communicating pipe, and the medium which finishes heat release in the heat release low-temperature section flows back to the heat absorption low-temperature section through the other condensed water self-return pipe.
The analysis can know, the utility model discloses a little whirl flue gas waste heat utilization equipment adopts the waste heat recovery of little whirl flue gas waste heat utilization technique flue gas, has reduced boiler flue's export exhaust gas temperature to utilize the waste heat heating air of recovery, reduced the fuel consumption of unit output, further improve the safe, the economic operation of boiler afterbody heated surface.
Drawings
The accompanying drawings, which form a part of the present application, 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 and not to limit the invention. Wherein:
fig. 1 is a schematic structural diagram of an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a heat exchange unit according to an embodiment of the present invention.
Fig. 3 is a schematic perspective view of a liner perforated pipe according to an embodiment of the present invention.
Description of reference numerals: 1, a flue; 2 a heat absorption section; 3, an air duct; 4, a heat release section; 5, a saturated steam communicating pipe; 6, a condensate water self-return pipe; 7 a first gate valve; 8 a second gate valve; 9 lining a perforated pipe; 10 through holes; 11 a safety valve; 12 medium inlet pipe; 13 water injection water meter; 14 a third gate valve; 15 flue inlet diffusion section; 16 flue outlet convergent section; 17 heat absorption high temperature section; 18 heat absorption low temperature section; 19 heat release high temperature section; 20 heat release low temperature section; 21 air duct inlet diffusion section; 22 air duct outlet contraction section; 23 an upper primary tube bundle; 24 lower main tube bundle; 25 tributary tube bundles; 26 a first header pipe; 27 a second header pipe; 28 a third header pipe; 29 fourth header pipe.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments. Each example is provided by way of explanation of the invention and not limitation of the invention. In fact, it will be apparent to those skilled in the art that modifications and variations can be made in the present invention without departing from the scope or spirit of the invention. For instance, features illustrated or described as part of one embodiment, can be used with another embodiment to yield a still further embodiment. It is therefore intended that the present invention encompass such modifications and variations as fall within the scope of the appended claims and equivalents thereof.
In the description of the present invention, the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description of the present invention and do not require that the present invention must be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention. The terms "connected", "connected" and "disposed" used in the present invention should be understood in a broad sense, and may be, for example, either fixedly connected or detachably connected; they may be directly connected or indirectly connected through intermediate members, and specific meanings of the above terms will be understood by those skilled in the art as appropriate.
As shown in fig. 1 to 3, according to the embodiment of the utility model, a little whirl flue gas waste heat utilization equipment is provided, the equipment can utilize the waste heat of flue gas in boiler flue 1 to heat the air, the equipment includes the heat exchanger, the heat exchanger includes heat absorption section 2 and heat release section 4, heat release section 4 highly is higher than the height of heat absorption section 2, preferably, the distance between heat release section 4 and the heat absorption section 2 is more than or equal to 1 meter. The periphery of the tube cavities of the heat absorption section 2 and the heat release section 4 is provided with annular fins, the heat absorption section 2 is installed at the tail part of the flue 1, flue gas is discharged after passing through the heat absorption section 2 and heating media in the heat absorption section 2, the heat release section 4 is installed in the air duct 3, air entering the boiler through the air duct 3 passes through the heat release section 4, the media are heated by the flue gas and then enter the heat release section 4 and heat the air, and the media after heat release in the heat release section 4 flow back to the heat absorption section 2. The medium is able to form a micro-swirl flow as it flows in both the heat absorption section 2 and the heat release section 4.
Furthermore, the device also comprises a saturated steam communicating pipe 5 and a condensate water self-return pipe 6, a medium heated by the flue gas enters the heat release section 4 through the saturated steam communicating pipe 5, and the medium subjected to heat release in the heat release section 4 flows back to the heat absorption section 2 through the condensate water self-return pipe 6; the saturated steam communicating pipe 5 is provided with a first gate valve 7, the first gate valve 7 is connected with a safety valve 11, the first gate valve 7 is in a normally open state, and the safety valve 11 can be conveniently repaired or replaced by closing the first gate valve 7. When the pressure of the saturated steam communicating pipe 5 rises to a preset value, the safety valve 11 is automatically opened to release the pressure, the saturated steam in the saturated steam communicating pipe 5 is discharged to the atmosphere, and further the pressure of the saturated steam communicating pipe 5 is prevented from rising continuously. When the pressure in the saturated steam communicating pipe 5 is reduced to a specified value, the safety valve 11 is automatically closed in time, and further the medium in the saturated steam communicating pipe 5 is prevented from being largely lost. Preferably, the medium circulating in the closed loop formed by the heat absorption section 2, the saturated steam communicating pipe 5, the heat release section 4 and the condensed water self-return pipe 6 is water subjected to desalination treatment.
Specifically, when flue gas in the flue 1 passes through the heat absorption section 2, water in the heat absorption section 2 is heated and is converted into saturated steam, the saturated steam enters the heat release section 4 through the saturated steam communicating pipe 5, heat exchange is carried out between the saturated steam in the heat release section 4 and the air passing through the heat release section 4, heating of the air is achieved, the saturated steam is converted into saturated water after heat release, the saturated water flows back to the heat absorption section 2 from the return pipe 6 through condensed water under the action of gravity, and the superconducting heat absorption and heat release process is completed.
Furthermore, the heat absorption section 2 and the heat release section 4 are respectively composed of a plurality of heat exchange units which are sequentially overlapped, the heat exchange units in the heat absorption section 2 are arranged perpendicular to the flowing direction of the flue gas, and the heat exchange units in the heat release section 4 are arranged perpendicular to the flowing direction of the air. As shown in fig. 2, the heat exchange units include an upper main tube bundle 23, a lower main tube bundle 24, and a plurality of branch tube bundles 25 communicating the upper main tube bundle 23 and the lower main tube bundle 24, the branch tube bundles 25 are perpendicular to the upper main tube bundle 23 and the lower main tube bundle 24, the upper main tube bundles 23 of the heat exchange units of the heat absorption section 2 are all communicated with one end of the saturated vapor communication tube 5 through a first header tube 26, the upper main tube bundles 23 of the heat exchange units of the heat release section 4 are all communicated with the other end of the saturated vapor communication tube 5 through a second header tube 27, the lower main tube bundles 24 of the heat exchange units of the heat absorption section 2 are all communicated with one end of the condensate self-return tube 6 through a third header tube 28, and the lower main tube bundles 24 of the heat exchange units of the heat release section 4 are all communicated with the other end of the condensate self-return tube 6. In the lumen of heat absorption section 2 and heat release section 4, tributary tube bank 25 has cup jointed inside lining perforated pipe 9, and the inner wall in tributary tube bank 25 is pasted to the outer wall of inside lining perforated pipe 9, and the both ends of inside lining perforated pipe 9 and the both ends of tributary tube bank 25 pass through welded fastening. As shown in fig. 3, the wall of the inner lining perforated pipe 9 is filled with through holes 10, the through holes 10 are arranged in a spiral manner, the spiral arrangement means that the two rows of adjacent through holes 10 are staggered up and down, specifically, a plurality of parallel through hole groups are arranged on the inner lining perforated pipe 9 along the axial direction of the inner lining perforated pipe 9, each through hole group comprises a plurality of through holes 10 uniformly distributed on the inner lining perforated pipe 9 along the circumferential direction of the inner lining perforated pipe 9, namely, on the side wall development of the inner lining perforated pipe 9, the plurality of through holes 10 are arranged in an array manner. The centers of all the through holes 10 are located on the spiral line, so that the medium can form micro-rotational flow when flowing in the branch pipe bundle 25. So set up and to increase the heat exchange area of medium and interior pipe wall, effectively increase heat exchange efficiency, the heat transfer effect increases by a wide margin. Preferably, the condensate passes from the return pipe 6 through the first header pipe 26, and at the location of the condensate passing through the first header pipe 26 from the return pipe 6, the diameter of the condensate from the return pipe 6 is smaller than the diameter of the first header pipe 26, and the first header pipe 26 can provide preheating of the medium in the condensate from the return pipe 6.
Further, the outer diameter of the branch pipe bundle 25 is 38mm, the wall thickness is generally 3.5mm, the outer diameter of the lining perforated pipe 9 is 32mm, the wall thickness is about 3mm, the diameter of the through hole 10 is 14mm, 15mm or 16mm, the arrangement of the through holes 10 is staggered, for example, the through holes are divided into a plurality of rows along the circumferential direction of the lining perforated pipe 9, and the through holes 10 in two adjacent rows are not on the cross section of the same lining perforated pipe 9. The arrangement can enable the medium to generate micro-swirling flow when flowing in the branch pipe bundle 25, and further enable the branch pipe bundle 25 to have better heat transfer enhancement effect.
In the process that the medium flows in the branch pipe bundle 25, under the effect of the lining perforated pipe 9, the medium forms a plurality of vortexes with different sizes in the lining perforated pipe 9, and then forms a micro-vortex, so that the turbulent flow property is achieved, the heat exchange efficiency is effectively increased, and the heat transfer effect is greatly increased.
In order to increase the heat transfer effect, a plurality of convex teeth are arranged on the inner pipe wall of the lining perforated pipe 9, each convex tooth comprises a plurality of convex parts, a through hole 10 is formed between every two adjacent convex parts, the convex teeth are distributed spirally along the pipe wall, and a groove is formed between every two adjacent convex teeth. The teeth and the grooves together form a thread on the inner pipe wall of the lined perforated pipe 9, so that the medium can form a micro-rotational flow when flowing in the lined perforated pipe 9. So set up and to increase the heat exchange area of medium and interior pipe wall, effectively increase heat exchange efficiency, the heat transfer effect increases by a wide margin.
The periphery of each branch pipe bundle 25 is sequentially sleeved with a plurality of annular fins along the length direction of the branch pipe bundle 25, a plurality of grooves extending from the top ends of the annular fins to the outer surface of the branch pipe bundle 25 are formed in the annular fins, the grooves promote the flow of the flue gas among the annular fins and enable the flue gas to form micro-rotational flow, and the heat exchange effect is improved, so that the heat transfer area can be saved and the metal consumption can be reduced under the condition of transferring the same heat; the grooves promote the flow of smoke among the annular fins, so that dust and scale are not easy to accumulate among the annular fins.
Further, the saturated steam communicating pipe 5 is provided with two, the condensate water self-return pipe 6 is provided with two, the heat absorption section 2 comprises a heat absorption high-temperature section 17 and a heat absorption low-temperature section 18, and the smoke sequentially passes through the heat absorption high-temperature section 17 and the heat absorption low-temperature section 18. The heat release section 4 comprises a heat release high-temperature section 19 and a heat release low-temperature section 20, air sequentially passes through the heat release low-temperature section 20 and the heat release high-temperature section 19, namely, the heat absorption high-temperature section 17, a saturated steam communicating pipe 5, the heat release high-temperature section 19, a condensate water self-return pipe 6 and the heat absorption high-temperature section 17 are sequentially communicated to form a closed loop for medium circulation, and the heat absorption low-temperature section 18, the other saturated steam communicating pipe 5, the heat release low-temperature section 20, the other condensate water self-return pipe 6 and the heat absorption low-temperature section 18 are sequentially communicated to form another closed loop for medium circulation. The medium in the heat absorption high temperature section 17 heated by the flue gas enters the heat release high temperature section 19 through a saturated steam communicating pipe 5, and the medium after heat release in the heat release high temperature section 19 flows back to the heat absorption high temperature section 17 from the return pipe 6 through condensed water; the medium in the heat absorption low-temperature section 18 heated by the flue gas enters the heat release low-temperature section 20 through another saturated steam communicating pipe 5, and the medium after heat release in the heat release low-temperature section 20 flows back to the heat absorption low-temperature section 18 from the return pipe 6 through another condensate water.
Furthermore, the condensate water self-return pipe 6 comprises a horizontal section and a vertical section, the upper end of the vertical section is connected with the heat release section 4, the lower end of the vertical section is connected with one end of the horizontal section, and the other end of the horizontal section is connected with the heat absorption section 2.
Furthermore, the device also comprises a medium inlet pipe 12, the medium inlet pipe 12 is communicated with the condensed water self-return pipe 6, a water injection water meter 13 is arranged on the medium inlet pipe 12, and two sides of the water injection water meter 13 are respectively provided with a second gate valve 8. When the medium needs to be supplemented into the heat exchanger, the two second gate valves 8 are opened, the medium can be supplemented into the heat exchanger by using the medium inlet pipe 12, and the water injection water meter 13 can measure the amount of the supplemented medium. And after the two second gate valves 8 are closed, the water injection water meter 13 can be conveniently maintained or replaced.
Further, the vertical section comprises two branch pipes and a main pipe, the upper ends of the two branch pipes are communicated with the heat release section 4, the lower ends of the two branch pipes are communicated with the upper end of the main pipe after being gathered, the lower end of the main pipe is communicated with one end of the horizontal section, and each branch pipe is provided with a third gate valve 14. The two branch pipes, the main pipe and the three gate valves 14 form a valve group for controlling the flow of the medium in the condensate water self-return pipe 6. The device also comprises wall temperature testers, wall temperature monitoring points are arranged on the heating surface walls of the heat absorption high-temperature section 17 and the heat absorption low-temperature section 18, the wall temperature testers are arranged on the wall temperature monitoring points, and the two wall temperature testers are respectively used for measuring the temperature of the tube wall of the heat absorption high-temperature section 17 and the heat absorption low-temperature section 18. The valve group is used for adjusting the flow of condensed water entering the heat absorption section 2 from a medium in the return pipe 6, further adjusting the pressure in the heat exchanger, and realizing the adjustment of the pipe wall temperature of the heat absorption high-temperature section 17 and the heat absorption low-temperature section 18, thereby controlling the temperature of the heating surface wall surface of the heat absorption high-temperature section 17 and the heat absorption low-temperature section 18 to be above the acid dew point temperature of the fuel of the boiler, and ensuring that the heat exchanger does not dewfall and corrode. The device can be ensured to operate safely for a long period while the waste heat of the flue gas is fully utilized.
Furthermore, the device also comprises a flue inlet diffusion section 15 and a flue outlet contraction section 16, wherein the flue inlet diffusion section 15 is arranged on the flue gas inlet side of the heat absorption section 2, and the flue outlet contraction section 16 is arranged on the flue gas outlet side of the heat absorption section 2; the device also comprises an air duct inlet diffusion section 21 and an air duct outlet contraction section 22, wherein the air duct inlet diffusion section 21 is arranged on the air inlet side of the heat release section 4, and the air duct outlet contraction section 22 is arranged on the air outlet side of the heat release section 4.
In one embodiment, the high temperature flue gas heats the water in the heat absorption high temperature section 17 and the heat absorption low temperature section 18 respectively, the water in the heat absorption high temperature section 17 is heated to 150 ℃, and the water in the heat absorption low temperature section 18 is heated to 110 ℃, so that the temperature of the flue gas is greatly reduced, the heated surface is operated at a safe temperature, and the thermal efficiency is improved. The pressure in the closed loop formed by the heat absorption high temperature section 17 and the heat release high temperature section 19 is 0.476MPa, and the pressure in the other closed loop formed by the heat absorption low temperature section 18 and the heat release low temperature section 20 is 0.143 MPa.
From the above description, it can be seen that the above-mentioned embodiments of the present invention achieve the following technical effects:
1. the micro-cyclone flue gas waste heat utilization device belongs to static equipment, does not need external power, and naturally circulates by means of gravity;
2. the valve group is used for controlling the reflux speed of saturated water, so that the internal pressure of the heat absorption section 2 is increased or reduced (the temperature is increased or reduced), and the operation that the temperature of the pipe walls of the heat absorption high-temperature section 17 and the heat absorption low-temperature section 18 is higher than the acid dew point of fuel is controlled; the device can reduce the temperature of the exhaust smoke to the maximum extent and can safely operate for a long period;
3. the heat absorption section 2 and the heat release section 4 are designed separately and are arranged in a zero-activity way;
4. the heat absorption section 2 and the heat release section 4 are matched in height, so that the inspection and maintenance are convenient.
The utility model discloses a little whirl flue gas waste heat utilization equipment adopts the waste heat recovery of little whirl flue gas waste heat utilization technique flue gas, has reduced boiler flue 1's export exhaust gas temperature to utilize the air in the waste heat heating wind channel 4 of retrieving, reduced the fuel consumption of unit output, further improve the safety of boiler afterbody heating surface, economic operation.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. 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.
Claims (10)
1. A micro-cyclone flue gas waste heat utilization device can utilize the waste heat of flue gas in a boiler flue to heat air entering a boiler, and is characterized in that,
the device comprises a heat exchanger, wherein the heat exchanger comprises a heat absorption section and a heat release section, the height of the heat release section is higher than that of the heat absorption section, and the peripheries of pipe cavities of the heat absorption section and the heat release section are provided with annular fins;
the heat absorption section is arranged at the tail part of the flue, and the flue gas passes through the heat absorption section and is discharged after heating the medium in the heat absorption section;
the heat release section is arranged in an air duct, and air entering the boiler through the air duct passes through the heat release section;
the medium is heated by the flue gas and then enters the heat release section to heat the air, and the medium after heat release in the heat release section flows back to the heat absorption section;
the medium can form micro-rotational flow when flowing in the pipe cavities of the heat absorption section and the heat release section.
2. The apparatus of claim 1,
the device also comprises a saturated steam communicating pipe and a condensate water self-return pipe, the medium heated by the flue gas enters the heat release section through the saturated steam communicating pipe, and the medium subjected to heat release in the heat release section flows back to the heat absorption section through the condensate water self-return pipe;
a first gate valve is arranged on the saturated steam communicating pipe, and a safety valve is connected with the first gate valve;
the medium is water.
3. The apparatus of claim 2,
the heat absorption section and the heat release section are composed of a plurality of heat exchange units which are vertically parallel and arranged at intervals, the heat exchange units in the heat absorption section are arranged perpendicular to the flowing direction of flue gas, and the heat exchange units in the heat release section are arranged perpendicular to the flowing direction of air.
4. The apparatus of claim 3,
the heat exchange units comprise an upper main tube bundle, a lower main tube bundle and a plurality of branch tube bundles communicated with the upper main tube bundle and the lower main tube bundle, the upper main tube bundles of the heat exchange units of the heat absorption section are communicated with one end of the saturated steam communicating pipe through a first header pipe, and the upper main tube bundles of the heat exchange units of the heat release section are communicated with the other end of the saturated steam communicating pipe through a second header pipe;
the lower main tube bundles of the heat exchange units of the heat absorption section are communicated with one end of the condensed water self-return tube through a third header tube, and the lower main tube bundles of the heat exchange units of the heat release section are communicated with the other end of the condensed water self-return tube through a fourth header tube;
in the heat absorption section and the heat release section, the branch pipe bundle is sleeved with a lining perforated pipe, two ends of the lining perforated pipe are welded with two ends of the branch pipe bundle, and the pipe wall of the lining perforated pipe is fully distributed with through holes which are arranged in a rotating manner;
every the periphery of tributary tube bank all has cup jointed a plurality of along tributary tube bank's length direction in proper order annular fin is last to be provided with a plurality of grooves by outside surface extension.
5. The apparatus of claim 4,
the outer diameter of the branch pipe bundle is 38 mm;
the outer diameter of the lining perforated pipe is 32mm, the diameter of the through holes is 14mm or 16mm, and the through holes are arranged in a spiral mode.
6. The apparatus of claim 2,
the condensed water self-refluxing pipe comprises a horizontal section and a vertical section, the upper end of the vertical section is connected with the heat releasing section, the lower end of the vertical section is connected with one end of the horizontal section, and the other end of the horizontal section is connected with the heat absorbing section.
7. The apparatus of claim 2,
the device also comprises a medium inlet pipe, the medium inlet pipe is communicated with the condensate water self-return pipe, a water injection water meter is arranged on the medium inlet pipe, and two sides of the water injection water meter are respectively provided with a second gate valve.
8. The apparatus of claim 6,
the vertical section comprises two branch pipes and a main pipe, the upper ends of the two branch pipes are communicated with the heat release section, the lower ends of the two branch pipes are converged and then communicated with the upper end of the main pipe, the lower end of the main pipe is communicated with one end of the horizontal section, the other end of the horizontal section is communicated with the heat absorption section, a third gate valve is arranged on each branch pipe, and the two third gate valves form a valve group;
the valve group is used for adjusting the flow of the condensed water entering the heat absorption section from the medium in the return pipe, so that the wall surface temperature of the heating surface of the heat absorption section is controlled to be above the dew point temperature of the boiler fuel acid.
9. The apparatus of claim 1,
the device also comprises a flue inlet diffusion section and a flue outlet contraction section, wherein the flue inlet diffusion section is arranged on the flue gas inlet side of the heat absorption section, and the flue outlet contraction section is arranged on the flue gas outlet side of the heat absorption section;
the device still includes wind channel import diffuser section and wind channel export shrink section, wind channel import diffuser section sets up the air entering side of heat release section, wind channel export shrink section sets up the air discharge side of heat release section.
10. The apparatus of claim 2,
the heat absorption section comprises a heat absorption high-temperature section and a heat absorption low-temperature section, and the flue gas sequentially passes through the heat absorption high-temperature section and the heat absorption low-temperature section;
the heat release section comprises a heat release high-temperature section and a heat release low-temperature section, and air sequentially passes through the heat release low-temperature section and the heat release high-temperature section;
two saturated steam communicating pipes are arranged, and two condensate water self-return pipes are arranged;
the medium in the heat absorption high-temperature section heated by the flue gas enters the heat release high-temperature section through the saturated steam communicating pipe, and the medium which finishes heat release in the heat release high-temperature section flows back to the heat absorption high-temperature section through the condensate water from the return pipe;
and the medium in the heat absorption low-temperature section heated by the flue gas enters the heat release low-temperature section through the other saturated steam communicating pipe, and the medium which finishes heat release in the heat release low-temperature section flows back to the heat absorption low-temperature section through the other condensed water self-return pipe.
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| CN201922302535.5U CN211781210U (en) | 2019-12-18 | 2019-12-18 | Micro-cyclone flue gas waste heat utilization device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922302535.5U CN211781210U (en) | 2019-12-18 | 2019-12-18 | Micro-cyclone flue gas waste heat utilization device |
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| Publication Number | Publication Date |
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| CN211781210U true CN211781210U (en) | 2020-10-27 |
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| CN201922302535.5U Active CN211781210U (en) | 2019-12-18 | 2019-12-18 | Micro-cyclone flue gas waste heat utilization device |
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