CN211176867U - Flue gas condensation heat exchanger structure of profile modeling flue gas runner structure - Google Patents
Flue gas condensation heat exchanger structure of profile modeling flue gas runner structure Download PDFInfo
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- CN211176867U CN211176867U CN201921715057.4U CN201921715057U CN211176867U CN 211176867 U CN211176867 U CN 211176867U CN 201921715057 U CN201921715057 U CN 201921715057U CN 211176867 U CN211176867 U CN 211176867U
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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 discloses a flue gas condensing heat exchanger structure of a profiling flue gas flow passage structure, which consists of a flue gas condensing unit, a conical gas distributing disc, a profiling shell and a demister; the plurality of arc units form an annular flue gas condensation unit; the flue gas is uniformly distributed to the inlet surface of each flue gas condensing unit under the common guide of the conical gas distribution disc and the profiling shell, and condensed water is collected in the conical gas distribution disc; the flue gas condensing unit can adopt a laser welding spiral finned tube, so that the corrosion of a condensate water gap is weakened, the heat exchange surface is expanded, and the weight of the heat exchanger is obviously reduced; the utility model cancels the traditional design of a cross-section tray of the desulfurization tower, and can realize the white smoke elimination by matching with an external or internal smoke reheater; the shape of the heat exchanger is similar to that of the original flue, and the flue gas condensing heat exchanger can be installed by replacing part of the original flue, so that the problems of large occupied space and tense installation space of a condensing and reheating system are solved, and the important requirements of low cost, low resistance, high efficiency and compact flue gas condensation and white elimination are met.
Description
Technical Field
The utility model relates to a heat exchanger field, concretely relates to flue gas condensation heat exchanger structure of profile modeling flue gas runner structure.
Background
In recent years, the haze problem persists, although coal fired units have mostly been retrofitted with ultra low emissions (NOx)<50mg/Nm3，SO2<35mg/Nm3，PM10<5mg/Nm3) Most of the gas boilers have also been modified with low nitrogen (NOx)<80mg/Nm3). However, from autumn every year, large-area haze weather still appears nationwide, although the emission of main atmospheric pollutants is already remarkably reduced compared with the peak value in 2013. The generation of haze needs high humid ambient condition, and a large amount of vapor will be generated in the use of fossil energy, is showing improvement air humidity, provides the basic condition for breeding of haze. Therefore, the haze weather is further reduced, dehumidification is needed, more than 30% of water vapor in the smoke discharged by the coal-fired, gas-fired and oil-fired units is removed through flue gas condensation, and the air humidity is reduced.
After 2016, the smoke whitening policy taking dehumidification as a main control index is developed in Tianjin, Hebei, Shanghai and other places in China, but the smoke whitening policy meets great resistance in the implementation process. The flue gas condensing heat exchanger has high investment cost and high operating cost, and brings great economic pressure to industrial enterprises; in particular, most of coal-fired boiler units in China have been subjected to desulfurization and denitrification transformation, wet electric transformation and other transformations, the field space is extremely compact, and the installation space of the flue gas condensation heat exchanger is insufficient. When the flue gas condenser arranges at the desulfurizing tower top, the comdenstion water that produces must be collected, otherwise can drop to destroy desulfurizing tower water balance in the desulfurizing tower thick liquid pond, for reaching this purpose, have had utility model all adopt to set up the built-in tray of the whole cross-section of transection flue gas runner in order to ensure that the flue gas flows the back comdenstion water and collect in the tray and discharge, but the built-in tray device flue gas resistance of present collection comdenstion water is high, and is more than 300Pa, causes the draught fan power consumption to increase substantially. After 2019, the smoke whitening policy in many places is trapped in stagnation, and a smoke condensing heat exchanger with low investment, low operation cost and small occupied space is urgently needed in the market.
The current flue gas condensation heat exchanger patent is more heavily focused on the design of a flue gas white elimination system, a lithium bromide heat pump or cooling tower circulating water is introduced as a cold source of the flue gas condensation heat exchanger, the flue gas condensation heat exchanger is arranged in multiple stages, and the like. The flue gas condensing heat exchanger in the market mainly comprises a light pipe and a high-frequency welding spiral finned pipe. The light pipe condensing heat exchanger has no expanded heating surface, only a small-caliber pipe is adopted to increase the heat exchange area in unit volume, the welding workload of the pipe plate is huge, the heat exchanger has large volume and high smoke and wind resistance, and the investment and the operating cost of the heat exchanger are high; the high-frequency welding spiral finned tube flue gas condensing heat exchanger is limited by a high-frequency welding process, the fin pitch is difficult to be smaller than 7mm, the fin height is generally lower than 30% of the diameter of a tube, the tube fin is low in fin ratio, the fusion of a fin welded with a base tube at high frequency is poor, gaps between the fin and the base tube are prone to cause gap corrosion in a condensate environment, the fin falls off, and the heat exchange capacity of the heat exchanger is greatly reduced. The finned tube prepared by the novel process has the advantages of resisting corrosion of desulfurized flue gas condensate, having higher finned ratio, remarkably reducing the volume of a heat exchanger and reducing the weight and smoke wind resistance of the heat exchanger.
Disclosure of Invention
In order to realize the degree of depth condensation of vapor in the boiler discharges fume, reduce air humidity, alleviate the haze problem, the utility model aims to provide a flue gas condensation heat exchanger structure of profile modeling flue gas runner structure, the utility model provides a big difficult problem of flue gas condensation heat exchanger area through the profile modeling design, makes flue gas condensation heat exchanger and former flue realize that compact low resistance is connected, has solved that condensation reheating system occupation of land space is big, the nervous difficult problem of installation space, realizes low cost, the high-efficient compact flue gas condensation of low resistance and disappears white great demand.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a flue gas condensation heat exchanger structure of a profiling flue gas flow passage structure is composed of a flue gas condensation unit 1, a conical gas distribution disc 2, a profiling shell 3 and a demister 4; the cylindrical part of the profiling shell 3 is connected with a cylindrical original flue, the profiling shell 3 has a supporting function, and the conical gas distribution plate 2 is fixed in the profiling shell 3; the flue gas condensing unit 1 is arranged on the conical gas distribution disc 2; the bottom of the conical gas distribution plate 2 is provided with a condensed water discharge pipe; the demister 4 is arranged at the outlet of the profiling shell 3; the flue gas of the original flue is uniformly distributed to the inlet surface of a flue gas condensation unit 1 under the guidance of a profiling shell 3 and a conical gas-distributing disc 2, the flue gas condensation unit 1 is cooled by circulating cooling water, when the flue gas passes through the flue gas condensation unit 1, the flue gas is cooled, a large amount of water vapor is condensed and separated out, wet flue gas carrying a large amount of liquid drops leaves the flue gas condensation unit 1, then the wet flue gas is removed with a large amount of liquid drops through a demister 4 and then leaves a flue gas condensation heat exchanger of a profiling flue gas flow channel structure, and the generated condensed water is collected in the conical gas-distributing disc 2 and is collected in a;
the conical gas distribution disc 2 has the functions of supporting the flue gas condensation unit 1, guiding flue gas and collecting condensed water, and is formed by sequentially connecting four parts of a conical surface 2-1 of the gas distribution disc, a cylindrical surface 2-2 of the gas distribution disc, a tapered circular table surface 2-3 of the gas distribution disc and a horizontal surface 2-4 of the gas distribution disc, the flue gas condensation unit 1 is placed on the horizontal surface 2-4 of the gas distribution disc of the conical gas distribution disc 2, and holes are formed in the horizontal surface 2-4; the cone tip of the conical gas distribution disc 2 is opposite to the incoming flow direction of the flue gas, the raw flue gas is uniformly distributed to an annular space formed by the cylindrical surface 2-2 of the gas distribution disc and the profiling shell 3 along the conical surface 2-1 of the gas distribution disc, and the arrangement of the tapered circular table surface 2-3 of the gas distribution disc can prevent the bottom area of the flue gas condensation unit 1 from being in a flue gas reflux area and the heat transfer from deteriorating; condensed water generated by the condensation of the flue gas falls into the conical water pool through the opening on the pore plate part of the horizontal plane 2-4 of the gas distribution plate and is discharged from a condensed water discharge pipe at the bottom of the conical water pool;
the profiling shell 3 is formed by sequentially connecting four parts of a shell gradually-expanding circular table surface 3-1, a shell cylindrical surface 3-2, a shell gradually-reducing circular table surface 3-3 and a shell horizontal surface 3-4, and the profiling shell 3 plays a role in guiding smoke; the flue gas is uniformly distributed into an annular space under the guidance of the conical gas distribution disc 2 and the profiling shell 3, an isobaric air chamber is formed by the shell reducing circular table surface 3-3 and the inlet surface of the condensation heat transfer unit 1, and the flue gas uniformly enters the flue gas condensation unit 1 under the guidance of the isobaric air chamber.
In order to facilitate transportation and installation, the flue gas condensation unit 1 is divided into 2-36 arc units along the circumference, is hung on the conical gas distribution disc 2 through a crane, and is welded into an integral annular flue gas condensation unit on site; each arc unit comprises an upper collection box 1-3, a lower collection box 1-5, a heat exchange tube bundle 1-4 arranged between the upper collection box 1-3 and the lower collection box 1-5, an inlet tube 1-1 and an outlet tube 1-2 which are arranged on the upper collection box 1-3 and communicated with the heat exchange tube bundle 1-4; circulating cooling water enters each circular arc unit from an inlet pipe 1-1, flows between an upper header 1-3 and a lower header 1-5 along a heat exchange pipe bundle 1-4, and exits from an outlet pipe 1-2.
Inlet pipes 1-1 and outlet pipes 1-2 of 1-8 arc units are respectively welded to a total inlet header 1-6 and a total outlet header 1-7, and circulating cooling water is distributed to corresponding flue gas condensation units 1 through 1-8 groups of total inlet headers 1-6 and total outlet headers 1-7.
The heat exchange tube bundle 1-4 of the flue gas condensation unit 1 adopts a U-shaped tube, a laser welding spiral finned tube, a high-frequency welding spiral finned tube, a straight tube or a combination of a plurality of tubes, a lower header 1-5 is omitted when the U-shaped tube is adopted, the fin distance is 2-30 mm, the fin height is 2-30 mm, the diameter of a base tube is 9-100 mm, the fin thickness is 0.05-3 mm, the circumferential direction is 1.2-3 relative pitch, and the radial direction is 1.2-3 relative pitch, the bottom of a fin steel strip and the surface of the base tube are welded together by laser beams, the diameter of the laser beams is small, the energy is concentrated, a heat affected zone is extremely small, a small round angle transition is formed between the bottom of the fins and the base tube, high-pressure online flushing devices are arranged at the flue gas side inlet, the outlet and the middle part of the flue gas condensation unit 1, high-pressure flushing is started regularly to prevent solid particles from depositing on the surface of the heat exchanger, the flue gas condensation unit 1 adopts austenitic stainless steels 304, 316, 317, 304, 316, 304, 904, 430, 2505, 11, 7, 11, 7, 11.
The heat exchange tube bundles 1-4 of the flue gas condensation unit 1 are arranged at an angle of 0-90 degrees with the vertical direction, namely from vertical arrangement to inclined arrangement to horizontal arrangement. The flue gas evenly erodes the heat exchange tube bundle under the common guide of the profiling shell 3 and the conical gas distribution plate 2, and the generated condensed water flows to the conical gas distribution plate 2 along the heat exchange tube bundle.
The water side flow of the flue gas condensation unit 1 adopts an arrangement mode of forward flow and backward flow, low-temperature cooling water exchanges heat with flue gas in a forward flow mode, a large amount of condensed water is separated out, the concentration of corrosive salt ions carried in the flue gas is diluted, the problems that during full-backward flow heat exchange, less condensed water is separated out when high-temperature cooling water exchanges heat with the flue gas, the concentration of the corrosive ions is higher, and a front discharge pipe of a heat exchanger is seriously corroded are solved, the number of heat exchange pipes in a forward flow area accounts for 1% -50% of the total number of the heat exchange pipes, and the cooling water exchanges heat with the rest flue gas in a backward flow mode after; the heat exchange tube bundle 1-4 of the flue gas condensation unit 1 is formed by mixing light tubes and finned tubes, flue gas firstly flows through the light tube sections and then enters the finned tube sections, the light tubes account for 1% -50% of the total number of heat exchange tubes, most of particulate matters in the flue gas are deposited on the surfaces of the light tubes and are easy to be washed by high-pressure water on line, and a large amount of scale formation of the particulate matters among fins which are difficult to be washed effectively is prevented.
The horizontal plane 2-4 of the gas distribution disc of the conical gas distribution disc 2 and the conical surface 2-1 of the gas distribution disc are supported by a steel frame, and the steel frame is erected on a supporting steel frame of an original flue or a special supporting steel frame is erected from the ground.
When the flue gas of the flue gas condensation heat exchanger with the profiling flue gas flow channel structure flows from top to bottom, the flue gas enters the annular flue gas condensation unit 1 under the common guidance of the conical gas distribution disc 2 and the profiling shell 3; the windward surface of the conical gas distribution disc 2 consists of a conical surface and a circular ring surface, the flue gas condensation unit 1 and the demister 4 are arranged on the circular ring surface of the whole conical gas distribution disc 2, and the generated condensed water automatically flows into the conical gas distribution disc 2 through an opening on the circular ring surface and is discharged through a condensed water drain pipe at the bottom of the conical gas distribution disc 2; the smoke is guided by the conical gas distribution disc 2 and the profiling shell 3 to turn downwards to flow from top to bottom, if the smoke needs to be extinguished, a smoke reheater 5 is arranged below the conical gas distribution disc 2, and the smoke is heated to reduce the relative humidity of the smoke, so that the white smoke is visually eliminated.
A flue gas reheater 5 is arranged above the outlet of the flue gas condensing heat exchanger of the profiling flue gas flow channel structure to realize the white elimination of flue gas; the demister 4 is arranged above the outlet of the flue gas condensing heat exchanger of the profiling flue gas flow channel structure and is parallel to the outlet surface, condensed flue gas enters the flue gas reheater 5 after small liquid drops are removed by the demister 4, and the relative humidity of the flue gas is reduced by heating the flue gas, so that white smoke is eliminated visually.
An annular demister 4 and an annular flue gas reheater 5 are arranged in the flue gas condensation heat exchanger of the profiling flue gas flow passage structure, the flue gas condensation unit 1 is arranged on the outermost layer, the annular demister 4 is arranged on the middle layer, and the annular flue gas reheater 5 is arranged on the innermost layer; the flue gas sequentially undergoes three processes of condensation, demisting and reheating in the heat exchanger along the radial direction of a circle; by heating the smoke, the relative humidity of the smoke is reduced, thereby eliminating the white smoke visually.
The utility model discloses innovation point, advantage and positive effect are:
1. the utility model discloses a flue gas condensation heat exchanger of profile modeling flue gas runner structure adopts overall structure profile modeling design's theory, cancels the traditional design of transecting flue gas runner tray, arranges flue gas condensation heat exchanger under the condition that does not change former flue by a wide margin, and the heat exchanger full resistance is little, and usable uptake flue realizes that flue gas condensation and comdenstion water are collected.
2. The utility model discloses a former flue gas inlet face of flue gas condensation heat exchanger of profile modeling flue gas runner structure is the periphery, with the discrete arc condensation unit that is one of flue gas, follow the pipe wall heat exchanger of discharging rapidly behind the condensation aquatic products, compares with traditional condensation heat transfer, and single pipe length reduces, has avoided the condensate liquid film to descend constantly the bodiness along the tube bank and lead to the problem that the heat transfer worsens.
3. The utility model discloses a flue gas condensation heat exchanger of profile modeling flue gas runner structure adopts laser welding spiral finned tube, and laser welding's fin root fuses completely with the parent tube, has avoided having had the gap to lead to the problem that gap corrosion, fin fracture heat transfer worsen between high frequency welding finned tube fin and the parent tube, can resist the corruption of condensate. Compared with a densely-arranged light pipe with the same mass, the laser welding spiral finned tube has the heat exchange area more than 3 times that of the closely-arranged light pipe, and the steel consumption and the smoke and wind resistance of the condensing heat exchanger are obviously reduced.
4. The utility model discloses a profile modeling flue gas runner structure's flue gas condensing heat exchanger's toper gas distribution disc adopts diamond appearance design, both can shunt the water conservancy diversion flue gas, also can support condensation heat transfer unit, can also collect the comdenstion water, has solved the problem that traditional flue gas condensing heat exchanger comdenstion water was collected the difficulty.
5. The utility model discloses a profile modeling flue gas runner structure's built-in or external defroster of flue gas condensation heat exchanger collocation and flue gas reheater can realize that the flue gas disappears whitely, are showing the area that has reduced the flue gas and disappear white system, can realize that the flue gas of old unit disappears white technological transformation.
Drawings
FIG. 1a is a block diagram of a contoured flue gas condensing heat exchanger; figure 1b is a schematic perspective cross-sectional view of a contoured flue gas condensing heat exchanger.
Fig. 2 is a schematic perspective view of a flue gas condensing unit 1 of a flue gas condensing heat exchanger with a profiling flue gas flow passage structure of the utility model.
Fig. 3 is a schematic perspective view of the ring-shaped condensing heat exchanger composed of a plurality of flue gas condensing units 1 of the flue gas condensing heat exchanger with a profiling flue gas flow passage structure of the utility model.
Fig. 4 is a schematic diagram of the flue gas condensing unit 1 of the flue gas condensing heat exchanger with a profiling flue gas flow passage structure when the flue gas condensing unit is obliquely placed.
Fig. 5 is a schematic diagram of a circulating cooling water flow mode and light pipes and finned tubes distribution of the flue gas condensing heat exchanger with a profiling flue gas flow passage structure of the utility model.
FIG. 6a is a schematic plan view of the conical gas distributor disk 2, the contoured housing 3; fig. 6b is a schematic perspective cross-sectional view of the conical gas distribution disk 2 and the contoured housing 3.
FIG. 7 is a schematic view of a flue gas condensing heat exchanger with a profiling flue gas flow passage structure when flue gas flows from top to bottom.
Fig. 8a is a schematic diagram of a configuration in which a flue gas reheater is externally installed, and fig. 8b is a schematic diagram of a configuration in which a flue gas reheater is internally installed.
Detailed Description
The following detailed description of the present invention will be made with reference to the accompanying drawings.
As shown in fig. 1a and fig. 1b, the utility model relates to a flue gas condensation heat exchanger structure of profile modeling flue gas runner structure, by flue gas condensation unit 1, toper gas distribution disc 2, profile modeling shell 3 and defroster 4 constitute. The cylindrical part of the profiling shell 3 is connected with a cylindrical original flue, the profiling shell 3 has a supporting function, and the conical gas distribution plate 2 is fixed in the profiling shell 3; the flue gas condensing unit 1 is arranged on the conical gas distribution disc 2; the bottom of the conical gas distribution plate 2 is provided with a condensed water discharge pipe; the demister 4 is provided at the outlet of the copying casing 3. Flue gas of an original flue is uniformly distributed to the inlet face of a flue gas condensation unit 1 under the guidance of a profiling shell 3 and a conical gas distribution disc 2, the flue gas condensation unit 1 is cooled by circulating cooling water, when the flue gas passes through the flue gas condensation unit 1, the flue gas is cooled, a large amount of water vapor is condensed and separated out, wet flue gas carrying a large amount of liquid drops leaves the flue gas condensation unit 1, then the wet flue gas is removed with a large amount of liquid drops through a demister 4 and then leaves a flue gas condensation heat exchanger of a profiling flue gas flow channel structure, and generated condensate water is collected in the conical gas distribution disc 2 and is collected in a bottom condensate water discharge. The optimal placement mode of the flue gas condensation heat exchanger is vertical placement, flue gas flows from bottom to top, but the flue gas condensation heat exchanger can also be placed at other angles, and at the moment, condensed water is collected poorly.
As shown in figure 2, the flue gas condensing unit 1 consists of an inlet pipe 1-1, an outlet pipe 1-2, an upper header 1-3, a heat exchange pipe bundle 1-4 and a lower header 1-5 from top to bottom, and is integrally fan-shaped. The heat exchange tube bundle 1-5 of the flue gas condensation unit 1 of the heat exchanger can adopt a U-shaped tube, a laser welding spiral finned tube, a high-frequency welding spiral finned tube, a straight tube or a combination of several tubes. Circulating cooling water enters the flue gas condensation unit 1 from the inlet pipe 1-1, flows between the upper collection box 1-3 and the lower collection box 1-5 along the heat exchange pipe bundle 1-4, and leaves from the outlet pipe 1-2, and the lower collection box 1-5 can be omitted when a U-shaped pipe is adopted.
As shown in fig. 3, the flue gas condensing unit 1 is circumferentially arranged on the conical gas distribution plate 2, and is annular as a whole. In order to facilitate transportation and installation, the flue gas condensation unit 1 can be divided into 2-36 arc units along the circumference, is hung on the conical gas distribution disc 2 through a crane, and is welded into an integral annular flue gas condensation unit on site; inlet pipes 1-1 and outlet pipes 1-2 of 1-8 arc units are respectively welded to a total inlet header 1-6 and a total outlet header 1-7, and circulating cooling water is distributed to corresponding flue gas condensation units 1 through 1-8 groups of total inlet headers 1-6 and total outlet headers 1-7.
As shown in fig. 4, the heat exchange tube bundle of the flue gas condensing unit 1 can be obliquely placed. The flue gas evenly scours the heat exchange tube bundle under the common guide of the profiling shell 3 and the conical gas distribution disc 2, and the generated condensed water flows to the conical gas distribution disc 2 along the tube bundle.
As shown in fig. 5, the water side flow of the flue gas condensation unit 1 can adopt an arrangement mode of forward flow and backward flow, low-temperature cooling water exchanges heat with flue gas preferentially in a forward flow mode, a large amount of condensed water is separated out, the concentration of corrosive salt ions carried in the flue gas is diluted, and the problems that during full-backward flow heat exchange, less condensed water is separated out when high-temperature cooling water exchanges heat with the flue gas, the concentration of the corrosive ions is higher, and the corrosion of a front discharge pipe of a heat exchanger is serious are solved, and the number of heat exchange pipes in a forward flow area accounts for 1% -50% of the total number of the; the heat exchange tube bundles 1-4 of the flue gas condensation unit 1 can be arranged by adopting a light pipe and a finned tube in a mixed mode, flue gas firstly flows through the light pipe section and then enters the finned tube section, the light pipe can account for 1% -50% of the total number of the heat exchange tubes, most of particulate matters in the flue gas are deposited on the surface of the light pipe and are easy to be washed by high-pressure water on line, and a large amount of scale formation of the particulate matters among fins which are difficult to wash effectively is.
As shown in fig. 6a and 6b, the conical gas distribution disc 2 has the functions of supporting the flue gas condensation unit 1, guiding flue gas and collecting flue gas, and is composed of four parts, namely a conical surface 2-1 of the gas distribution disc, a cylindrical surface 2-2 of the gas distribution disc, a tapered circular table surface 2-3 of the gas distribution disc and a horizontal surface 2-4 of the gas distribution disc. The weight of the flue gas condensation unit 1 is between 1t and 200t, the flue gas condensation unit is placed on a horizontal plane 2-4 of a gas distribution disc of a conical gas distribution disc 2, the horizontal plane 2-4 of the gas distribution disc of the conical gas distribution disc 2 and a conical surface 2-1 of the gas distribution disc are supported by a steel frame, the steel frame can be erected on a supporting steel frame of an original flue, a stove can be also taken out, and a special supporting steel frame is erected from the ground; the cone tip of the conical gas distribution disc 2 is opposite to the incoming flow direction of the flue gas, the original flue gas is uniformly distributed to an annular space formed by the cylindrical surface 2-2 of the gas distribution disc and the profiling shell 3 along the conical surface 2-1 of the gas distribution disc, and the arrangement of the tapered circular table surface 2-3 of the gas distribution disc can prevent the bottom area of the flue gas condensation unit 1 from being in a flue gas reflux area and the heat transfer from deteriorating; condensed water generated by the condensation of the flue gas falls into the conical water pool through the opening on the pore plate part of the horizontal plane 2-4 of the gas distribution plate and is discharged from a condensed water discharge pipe at the bottom of the conical water pool. The profiling shell 3 consists of four parts, namely a shell gradually-expanding circular table surface 3-1, a shell cylindrical surface 3-2, a shell gradually-reducing circular table surface 3-3 and a shell horizontal surface 3-4, and the profiling shell 3 plays a role in guiding smoke. The flue gas is uniformly distributed into an annular space under the guidance of the conical gas distribution disc 2 and the profiling shell 3, an isobaric air chamber is formed by the shell reducing circular table surface 3-3 and the inlet surface of the flue gas condensation unit 1, and the flue gas uniformly enters the condensation heat transfer unit 1 under the guidance of the isobaric air chamber.
As shown in fig. 7, when the flue gas of the flue gas condensing heat exchanger with the profiling flue gas flow channel structure flows from top to bottom, the flue gas enters the annular flue gas condensing unit 1 under the common guidance of the conical gas distribution disc 2 and the profiling shell 3; the windward surface of the conical gas distribution disc 2 consists of a conical surface and a circular ring surface, the flue gas condensation unit 1 and the demister 4 are arranged on the circular ring surface of the whole conical gas distribution disc 2, and the generated condensed water automatically flows into the conical gas distribution disc 2 through an opening on the circular ring surface and is discharged through a condensed water drain pipe at the bottom of the conical gas distribution disc 2; the smoke is guided by the conical gas distribution disc 2 and the profiling shell 3 to turn downwards to flow from top to bottom, if the smoke needs to be extinguished, a smoke reheater 5 is arranged below the conical gas distribution disc 2, and the smoke is heated to reduce the relative humidity of the smoke, so that the white smoke is visually eliminated.
As shown in fig. 8a, a flue gas reheater 5 can be arranged above the outlet of the profiling flue gas condensing heat exchanger to realize flue gas whitening. The demister 4 is arranged above and below the outlet of the profiling flue gas condensation heat exchanger and is parallel to the outlet surface, condensed flue gas enters the flue gas reheater 5 after small liquid drops are removed through the demister 4, and the relative humidity of the flue gas is reduced by heating the flue gas, so that white smoke is eliminated visually. As shown in fig. 8b, an annular demister 4 and an annular flue gas reheater 5 may be arranged in the flue gas condensing heat exchanger of the profiling flue gas flow channel structure. The flue gas condensing unit 1 is arranged on the outermost layer, the annular demister 4 is arranged on the middle layer, and the annular flue gas reheater 5 is arranged on the innermost layer. The flue gas is sequentially subjected to three processes of condensation, demisting and reheating along the radial direction of a circle in the heat exchanger. By heating the smoke, the relative humidity of the smoke is reduced, thereby eliminating the white smoke visually.
Claims (10)
1. The utility model provides a flue gas condensation heat exchanger structure of profile modeling flue gas runner structure which characterized in that: the device consists of a flue gas condensing unit (1), a conical gas distribution disc (2), a profiling shell (3) and a demister (4); the cylindrical part of the profiling shell (3) is connected with the cylindrical original flue in a welding or flange mode, the profiling shell (3) has a supporting function, the conical gas distribution disc (2) is fixed in the profiling shell (3), and when the original flue is a rectangular flue, the connecting part of the profiling shell (3) and the original flue is changed into a rectangle; the flue gas condensing unit (1) is arranged on the conical gas distribution disc (2); the bottom of the conical gas distribution disc (2) is provided with a condensed water discharge pipe; the demister (4) is arranged at the outlet of the profiling shell (3);
the conical gas distribution disc (2) has the functions of supporting a flue gas condensation unit (1), guiding flue gas and collecting condensed water, and is formed by sequentially connecting four parts of a conical surface (2-1) of the gas distribution disc, a cylindrical surface (2-2) of the gas distribution disc, a tapered circular table surface (2-3) of the gas distribution disc and a horizontal surface (2-4) of the gas distribution disc, wherein the flue gas condensation unit (1) is placed on the horizontal surface (2-4) of the gas distribution disc of the conical gas distribution disc (2), and a hole is formed in the horizontal surface (2-4); the cone tip of the conical gas distribution disc (2) is opposite to the incoming flow direction of the flue gas, the original flue gas is uniformly distributed to an annular space formed by the cylindrical surface (2-2) of the gas distribution disc and the profiling shell (3) along the conical surface (2-1) of the gas distribution disc, and the arrangement of the tapered circular table surface (2-3) of the gas distribution disc can prevent the bottom area of the flue gas condensation unit (1) from being in a flue gas reflux area and the heat transfer from deteriorating;
the profiling shell (3) is formed by sequentially connecting four parts of a shell gradually-expanding circular table surface (3-1), a shell cylindrical surface (3-2), a shell gradually-reducing circular table surface (3-3) and a shell horizontal surface (3-4), and the profiling shell (3) plays a role in guiding smoke; the shell reducing circular table surface (3-3) and the inlet surface of the flue gas condensing unit (1) form an isobaric air chamber.
2. A flue gas condensing heat exchanger structure of a contoured flue gas flow channel structure as claimed in claim 1, wherein: in order to facilitate transportation and installation, the flue gas condensation unit (1) is divided into 2-36 arc units along the circumference, is hung on the conical gas distribution disc (2) through a crane, and is welded into an integral annular flue gas condensation unit on site; each circular arc unit comprises an upper collecting box (1-3), a lower collecting box (1-5), a heat exchange tube bundle (1-4) arranged between the upper collecting box (1-3) and the lower collecting box (1-5), and an inlet tube (1-1) and an outlet tube (1-2) which are arranged on the upper collecting box (1-3) and communicated with the heat exchange tube bundle (1-4).
3. A flue gas condensing heat exchanger structure of a contoured flue gas flow channel structure as claimed in claim 2, wherein: inlet pipes (1-1) and outlet pipes (1-2) of 1-8 arc units are respectively welded to a total inlet header (1-6) and a total outlet header (1-7), and circulating cooling water is distributed to corresponding flue gas condensation units (1) through 1-8 groups of total inlet headers (1-6) and total outlet headers (1-7).
4. The flue gas condensation heat exchanger structure of a profiling flue gas flow passage structure according to claim 2 is characterized in that a heat exchange tube bundle (1-4) of the flue gas condensation unit (1) adopts a U-shaped tube, a laser welding spiral finned tube, a high-frequency welding spiral finned tube, a straight tube or a combination of several tubes, a lower header (1-5) is omitted when the U-shaped tube is adopted, when the laser welding spiral finned tube is adopted, the fin pitch is 2-30 mm, the fin height is 2-30 mm, the diameter of a base tube is 9-100 mm, the fin thickness is 0.05-3 mm, the circumferential direction is 1.2-3, the radial direction is 1.2-3, a high-pressure water online flushing device is arranged at an inlet, an outlet and a middle part of the flue gas side of the flue gas condensation unit (1), high-pressure water flushing is started periodically to prevent solid particles from depositing on the surface of the heat exchanger, and the flue gas condensation unit (1) adopts austenitic stainless steel 304, 316, 317, 36304, L, 316, 317, 316, 317, 150, 2505, TA, 150, 24.
5. A flue gas condensing heat exchanger structure of a contoured flue gas flow channel structure as claimed in claim 2, wherein: the heat exchange tube bundle (1-4) of the flue gas condensation unit (1) is placed at an angle of 0-90 degrees with the vertical direction, namely from vertical placement to inclined placement to horizontal placement.
6. A flue gas condensing heat exchanger structure of a contoured flue gas flow channel structure as claimed in claim 2, wherein: the heat exchange tube bundle (1-4) of the flue gas condensation unit (1) is formed by mixing light tubes and finned tubes, flue gas firstly flows through a light tube section and then enters a finned tube section, and the light tubes account for 1% -50% of the total number of heat exchange tubes.
7. A flue gas condensing heat exchanger structure of a contoured flue gas flow channel structure as claimed in claim 1, wherein: the horizontal plane (2-4) of the gas distribution disc of the conical gas distribution disc (2) and the conical surface (2-1) of the gas distribution disc are supported by a steel frame, and the steel frame is erected on a supporting steel frame of an original flue or a special supporting steel frame is erected from the ground.
8. A flue gas condensing heat exchanger structure of a contoured flue gas flow channel structure as claimed in claim 1, wherein: when the flue gas of the flue gas condensation heat exchanger with the profiling flue gas flow channel structure flows from top to bottom, the windward surface of the conical gas distribution disc (2) consists of a conical surface and a circular ring surface, the flue gas condensation unit (1) and the demister (4) are arranged on the circular ring surface of the whole conical gas distribution disc (2), and a flue gas reheater (5) is arranged below the conical gas distribution disc (2) if the flue gas is required to be whitened.
9. A flue gas condensing heat exchanger structure of a contoured flue gas flow channel structure as claimed in claim 1, wherein: a flue gas reheater (5) is arranged above the outlet of the flue gas condensing heat exchanger of the profiling flue gas flow channel structure to realize flue gas whitening; the demister (4) is arranged above the outlet of the flue gas condensing heat exchanger of the profiling flue gas flow channel structure and is parallel to the outlet surface.
10. A flue gas condensing heat exchanger structure of a contoured flue gas flow channel structure as claimed in claim 1, wherein: an annular demister (4) and an annular flue gas reheater (5) are arranged in a flue gas condensing heat exchanger of the profiling flue gas flow channel structure, a flue gas condensing unit (1) is arranged on the outermost layer, the annular demister (4) is arranged in the middle layer, and the annular flue gas reheater (5) is arranged on the innermost layer.
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| CN110631044A (en) * | 2019-10-14 | 2019-12-31 | 西安交通大学 | Flue gas condensation heat exchanger of profile modeling flue gas runner structure |
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