CN215863497U - Novel gas-gas heat exchanger and novel SCR (selective catalytic reduction) system for high-dust environment - Google Patents

Novel gas-gas heat exchanger and novel SCR (selective catalytic reduction) system for high-dust environment Download PDF

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Publication number
CN215863497U
CN215863497U CN202121780350.6U CN202121780350U CN215863497U CN 215863497 U CN215863497 U CN 215863497U CN 202121780350 U CN202121780350 U CN 202121780350U CN 215863497 U CN215863497 U CN 215863497U
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heat exchange
gas
heat exchanger
novel
exchange straight
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谭宝霞
张喜斌
张建飞
于宏然
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Sinochem Environment Air Pollution Control Co Ltd
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BEIJING CEC ENVIRONMENT ENGINEERING CO LTD
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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
    • Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
    • 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
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/25—Process efficiency

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Abstract

The utility model relates to a novel gas-gas heat exchanger and a novel SCR system for a high-dust environment, wherein the heat exchanger is provided with a plurality of heat exchange straight pipes distributed in a single layer or in multiple layers, each heat exchange straight pipe distributed in a single layer forms a heat exchange branch, each heat exchange straight pipe distributed in multiple layers and positioned in the same arrangement sequence in the longitudinal direction are mutually connected in series to form a heat exchange branch, each heat exchange straight pipe adopts a vortex joint pipe, and an anti-abrasion angle steel is arranged on each heat exchange straight pipe. The SCR system arranges the heat exchanger in a flue, generates high-temperature air for ammonia water gasification by means of flue gas heating, and simultaneously uses the heat exchanger as a static mixer. The utility model can effectively utilize the heat energy of the flue gas to heat the air, form a heat medium suitable for heating and gasifying ammonia water, and can effectively simplify the system structure of the SCR.

Description

Novel gas-gas heat exchanger and novel SCR (selective catalytic reduction) system for high-dust environment
Technical Field
The utility model relates to a novel gas-gas heat exchanger for a high-dust environment and a novel SCR system adopting the gas-gas heat exchanger.
Background
Among the numerous denitration techniques, Selective Catalytic Reduction (SCR) is the most mature denitration technique with the highest denitration efficiency. The selective catalytic reduction method is to selectively react NO with a reducing agent under the action of a metal catalystxReaction to form N2And H2O instead of by O2Oxidation is therefore referred to as "selectivity". It has no by-product, no secondary pollution, simple structure, high eliminating efficiency (up to 90%), reliable operation, easy maintenance and other advantages.
The reductant of SCR denitration has liquid ammonia, aqueous ammonia and urea, wherein the aqueous ammonia is used for SCR deNOx systems, need be the ammonia with aqueous ammonia gasification, participate in the SCR denitration reaction by the ammonia, consequently need adopt certain mode to heat the aqueous ammonia, current heating methods are mostly to adopt steam to be the hot medium, heat through tubular heater, however, steam need be equipped with special industrial boiler usually or have the industry steam pipe network, the investment ratio is bigger, also do not benefit to the used heat utilization of flue gas itself simultaneously.
In addition, the tubular heat exchanger is used for heating, the flow and the temperature of ammonia gas are difficult to realize cooperative and consistent control, subsequent catalytic reduction reaction is not facilitated, and efficient utilization of heat energy is also not facilitated.
SUMMERY OF THE UTILITY MODEL
In order to overcome the defects in the prior art, the novel gas-gas heat exchanger for the high-dust environment and the novel SCR system adopting the gas-gas heat exchanger can effectively utilize the heat energy of flue gas to heat air to form a heat medium suitable for heating and gasifying ammonia water.
The technical scheme of the utility model is as follows: the novel gas-gas heat exchanger for the high-dust environment is provided with a plurality of heat exchange straight pipes (heat exchange pipes for short), wherein the heat exchange straight pipes adopt a single-layer distribution mode or a multi-layer distribution mode, the heat exchange straight pipes positioned on the same layer are mutually parallel, the heat exchange straight pipes positioned on different layers are mutually parallel or not mutually parallel, in the single-layer distribution mode, each heat exchange straight pipe forms a heat exchange branch, two ends of each heat exchange straight pipe are respectively connected with a cold air header and a hot air header, in the multilayer distribution mode, the number of the heat exchange straight pipes of each layer is equal, the heat exchange straight pipes which are longitudinally positioned in the same arrangement sequence are mutually connected in series to form a heat exchange branch, the pipe orifices which are positioned on the heat exchange straight pipes of the first layer and the last layer in the vertical direction and are not connected with other heat exchange straight pipes are respectively connected with a cold air header and a hot air header, and the heat exchange straight pipes adopt vortex joint pipes.
Preferably, the convex-concave structures of adjacent scroll tubes serving as adjacent heat exchange straight tubes of the same layer correspond to each other, i.e., the convex portion of one scroll tube is located at the same lateral position as the concave portion of the adjacent scroll tube.
Preferably, the heat exchange device is further provided with a support, and the heat exchange straight pipe, the cold air header and the hot air header are all arranged on the support.
Preferably, the support comprises a support plate and frames positioned on two sides, the vertical face of the support plate is arranged (the plate surface is perpendicular to the transverse direction), two ends of the support plate are respectively and fixedly connected to the frames on the two sides, a through hole for penetrating and supporting the heat exchange straight pipe is formed in the support plate, and the heat exchange straight pipe penetrates through the corresponding through hole in the support plate and is supported on the corresponding through hole.
Usually, the heat transfer straight tube of each layer is supported simultaneously to the backup pad, sets up the through-hole of the corresponding number of piles according to the number of piles of heat transfer straight tube. The same supporting plate is adopted, so that the processing and the assembly are convenient, and the integrity and the effective separation of the flow surface of the flue are facilitated.
Preferably, the cold air header and the hot air header are respectively provided with a cold air inlet pipe and a hot air outlet pipe for receiving cold air and introducing hot air.
Preferably, the extension directions of all layers of heat exchange straight pipes in a multilayer distribution mode are the same, and all layers of heat exchange straight pipes for forming the same heat exchange branch are connected end to end through 180-degree elbows.
Preferably, the extension directions of the heat exchange straight pipes in each layer in the multilayer distribution mode are the same, and the heat exchange straight pipes in adjacent layers are distributed in a staggered manner in the longitudinal direction, for example, the vertical projections of the heat exchange straight pipes in adjacent two layers are alternately distributed at equal intervals.
Preferably, the cold air header and the hot air header are cylindrical having a rectangular (including square) or circular cross-section.
Preferably, a fan and an adjusting valve are arranged on a cold air input pipeline connected with the cold air inlet pipe, and a temperature monitoring device is arranged on a hot air output pipeline connected with the hot air outlet pipe.
Preferably, a plurality of anti-abrasion angle steels are further arranged, the anti-abrasion angle steels are located on one vertical side of the heat exchange straight pipes, the extending directions of the anti-abrasion angle steels are consistent with the extending directions of the heat exchange straight pipes, one anti-abrasion angle steel is arranged at any longitudinal position where one heat exchange straight pipe is arranged, namely, one anti-abrasion angle steel is arranged on any heat exchange straight pipe and is overlapped with the other anti-abrasion angle steel in vertical projection, and therefore, one anti-abrasion angle steel is arranged in the vertical direction of all the heat exchange straight pipes to shield smoke gas flow facing the vertical direction.
The longitudinal size of the anti-abrasion angle steel is not smaller than that of the heat exchange straight pipe, so that the anti-abrasion effect of the heat exchange straight pipe is guaranteed.
The anti-abrasion angle steel can be fixedly arranged on the support, and other installation modes can also be adopted.
The side of abrasionproof angle steel can be equipped with the disturbance blade of vertical extension, the disturbance blade is the flat of putting to one side, its face is on a parallel with horizontal straight line, for vertical slope, promptly with there is an contained angle between the vertical straight line, the disturbance blade of same abrasionproof angle steel both sides is the same for vertical incline direction, the disturbance blade of the adjacent side of adjacent abrasionproof angle steel is opposite for vertical incline direction, form the whirl of certain degree between two abrasionproof angle steels from this, make the flue gas can more effectively or comprehensive contact with the heat transfer straight tube, and the heat exchange efficiency is improved, when being used as static mixer simultaneously, also can play better mixed effect, this mixed effect not only derives from the disturbance of disturbance blade to the air current, and still strengthen because of the water conservancy diversion effect that the heat transfer straight tube formed.
The length (longitudinal dimension on the plate face) of the disturbance vanes may typically be no greater than 1/5 of the gap between adjacent wear angles to avoid creating excessive drag.
The width (the size perpendicular to the longitudinal direction on the plate surface) of the disturbing blades can be set according to actual needs, and generally, the sum of the widths of all the stirring blades on either side of the wear-resistant angle is not more than 1/8 of the length of the wear-resistant angle.
Novel SCR system for high dust environments, characterized in that it comprises:
the ammonia spraying grid is arranged in the flue, is provided with an ammonia gas nozzle or an ammonia spraying hole and is connected with an ammonia gas source through a pipeline;
the ammonia source is positioned outside the flue and is provided with ammonia water gasification equipment, and the ammonia water gasification equipment is provided with a high-temperature air inlet;
high-temperature air preparation equipment adopts the novel gas-gas heat exchanger for the high-dust environment as claimed in any one of claims 1 to 8, the novel gas-gas heat exchanger for the high-dust environment is installed in the flue and is positioned at the downstream of the ammonia injection grid, and the high-temperature air output of the hot air header is connected to the high-temperature air inlet of the ammonia water gasification equipment.
Preferably, the number of the novel gas-gas heat exchangers for the high-dust environment is two, and the extension directions of the heat exchange straight pipes in the novel gas-gas heat exchanger for the high-dust environment are consistent and two, the extension directions of the heat exchange straight pipes in the novel gas-gas heat exchanger for the high-dust environment are mutually perpendicular (the heat exchange straight pipes are perpendicular in different planes), and two, a space is reserved between the novel gas-gas heat exchangers for the high-dust environment.
Preferably, the anti-abrasion angle steel in the novel gas-gas heat exchanger for the high-dust environment is positioned in the upstream direction of the corresponding heat exchange straight pipe.
The utility model has the beneficial effects that: the heat exchanger can be arranged in a flue, smoke is used as a heat medium to heat air, and when the air passes through the heating pipe, the heat energy of external smoke is absorbed by the heating pipe to reach a proper high temperature, so that ammonia water is heated to form ammonia gas. The adopted heat exchange tube vortex tube has a unique vortex structure, can effectively enhance the heat transfer efficiency of the heating tube, improves the utilization rate of the waste heat of the flue gas, has excellent characteristic of reducing dust deposition in a high-dust setting mode, and is particularly suitable for flue gas environments with larger dust content in industries such as metallurgy and the like; install this kind of heat exchanger in the flue downstream of spouting the ammonia grid, can have the vortex effect concurrently, make the more even mixture of ammonia and flue gas to improve denitration efficiency, reduce the ammonia escape.
Drawings
FIG. 1 is a schematic top view of a heat exchanger to which the present invention relates;
FIG. 2 is a schematic sectional view taken along line B-B in FIG. 1;
FIG. 3 is a schematic cross-sectional view taken along line C-C in FIG. 1;
FIG. 4 is a schematic left side view corresponding to FIG. 1;
FIG. 5 is an enlarged partial schematic view of I corresponding to FIG. 3;
fig. 6 is a schematic diagram of an SCR system according to the present invention.
Detailed Description
Referring to fig. 1-5, the novel gas-gas heat exchanger can be arranged in a flue of an SCR system, and heats cold air into hot air by using waste heat of flue gas, and mainly comprises a support 1 (or called a support structure), a heat exchange tube 4, a cold air header 5, a hot air header 6, a support plate 7, a 180-degree elbow 8 and abrasion-proof angle steel 9, wherein the heat exchange tube adopts a vortex heat exchange tube, the vortex heat exchange tube is a tube with a vortex structure on the tube wall, and the contact area with the flue gas can be effectively increased by the vortex structure, so that the heat exchange efficiency is improved.
The quantity of heat exchange tube is a plurality of, and the both ends of heat exchange tube insert cold air collection case and hot-air collection case respectively, the cold air collection case is equipped with cold air import pipe 2 faces for insert the cold air, the hot-air collection case is equipped with hot-air outlet pipe 3 for draw-off hot-air, and cold air collection case and hot-air collection case homoenergetic simultaneously can play the pressure-sharing effect to do benefit to the flow unanimity of each heat exchange tube.
Can get up a plurality of heat transfer straight tubes through the elbow end to end in proper order and form the heat transfer branch road, or form a long heat exchange tube, generally, can make heat transfer straight tube perpendicular to flue gas flow direction (the extending direction of flue, or the flue gas flow in the flue the overall flow direction, lower with) and form a plurality of heat transfer straight tubes of same heat transfer branch road and arrange in proper order along flue gas flow direction and be the multilayer, the heat transfer straight tube of each heat transfer branch road adopts the same layering mode to distribute, form the multilayer heat transfer tubular construction that every layer was equipped with a plurality of heat transfer straight tubes from this.
In the multilayer heat exchange tube structure, the heat exchange tubes of adjacent layers are distributed on the cross section of the flue in a staggered manner, namely, the projections on the cross section of the flue are alternately distributed at equal intervals, so that the multilayer heat exchange tube structure is beneficial to full contact with flue gas and disturbance to the flue gas.
In order to realize the staggered distribution of the heat exchange tubes of adjacent layers on the cross section of the flue, the plane of the elbow (the plane of the axis of the elbow) and the flue gas flow direction form an acute included angle so as to realize the elbow connection between the heat exchange straight tubes forming the same heat exchange branch in the adjacent layers.
The number of layers of the heat exchange tubes can be set according to actual needs, the more the number of layers is under the same flue, the longer the heat exchange length of the same branch is, the better the heat exchange effect is, the comprehensive consideration of related factors in aspects such as heating temperature requirements, cost and volume can be comprehensively considered, and the appropriate number of layers is selected.
For example, the number of the distribution layers of the heat exchange tubes can be one layer, two layers, three layers or four layers, when the two layers are formed, the heat exchange straight tubes in the two layers are connected by an elbow, and the tube openings which are not connected with the elbow on the two layers of heat exchange straight tubes respectively form the inlet and the outlet of the heat exchange branch and are respectively connected into the cold air header and the hot air header, under the condition, the cold air header and the hot air header are positioned on the same side, so that the arrangement of field pipelines is facilitated.
The support is used for installation and support cold air collection case, hot-air collection case and heat exchange tube, the support can include the frame and the backup pad of both sides, the extending direction of backup pad with the frame is perpendicular, and both ends are fixed (for example, the welding) on the frame, the backup pad can be the orifice plate, is equipped with on the face to be used for passing the through-hole of heat transfer straight tube can be through welding or fastener (for example, be located between the through-hole of heat transfer straight tube and backup pad with the sealing ring or the annular buckle of the short tube-shape that heat exchange tube and backup pad extrusion are in the same place).
The plate surface of the supporting plate is generally perpendicular to the heat exchange straight pipe, so that the supporting and fixing effects on the heat exchange straight pipe are achieved, the flow passing area (cross section of the flue) in the flue is divided into a plurality of small areas, the uniform distribution of flue gas flow in each small area is facilitated, and the overall heat exchange efficiency is improved.
The two ends of the frame can be provided with mounting seats 10, and the mounting seats can be fixed on corresponding mounting bases through bolts or welding and other modes so as to realize the mounting and fixing of the heat exchanger.
The cold air header and the hot air header can adopt a sealed box body with a rectangular cross section, so as to be beneficial to field layout.
The cold air header can be usually arranged at the downstream of the hot air header (the outflow direction of flue gas flow), correspondingly, the heat exchange straight pipes positioned at the upstream in the heat exchange branch are connected into the hot air header, and the heat exchange straight pipes positioned at the downstream are connected into the cold air header, so that the arrangement mode is favorable for improving the temperature of the hot air.
The upper reaches of each heat exchange straight pipe can all be equipped with the abrasionproof angle steel to avoid the direct impact of high dust flue gas and wearing and tearing heat exchange straight pipe, for the facility of laying at the scene, each abrasionproof angle steel can distribute on same cross section.
The angle part of the anti-abrasion angle steel faces the smoke in the incoming direction, and the smoke flows to the two sides of the angle steel under the guidance of the anti-abrasion angle steel respectively, so that the impact on the heat exchange straight pipe located at the position right downstream of the anti-abrasion angle steel is obviously relieved.
Referring to fig. 6, the heat exchanger can be used as a source of high-temperature air (high-temperature dilution air) of the SCR system and a static mixing device, the heat exchangers 21 and 22 can be arranged in a flue 24 at the downstream of an ammonia injection grid 23 of the SCR system to realize disturbance and mixing of flue gas, when ammonia gas injected into flue gas from the ammonia injection grid flows through the heat exchanger along with the flue gas, air in the heat exchange tubes absorbs heat energy of the flue gas, the temperature is increased to become hot air, and meanwhile, the heat exchange tubes form disturbance in the flue gas flow, so that the ammonia gas and the flue gas are better mixed.
For example, the heat exchanger is a two-layer heat exchanger, the number of the heat exchanger is two (see fig. 6), the two heat exchangers are distributed on two cross sections of the flue, a certain distance is reserved between the two heat exchangers, the extension directions of the heat exchange straight pipes in the two heat exchangers are mutually perpendicular (different surfaces are perpendicular), and are all perpendicular to the extension direction of the flue, so that disturbance to different directions of flue gas is formed, the mixing effect of ammonia gas and flue gas is favorably improved, an ash hopper can be arranged at the bottom of the flue (vertical flue), fly ash particles falling from the flue gas due to self weight or inertia and the like fall into the ash hopper, and the fly ash particles are collected for a certain time and then are discharged from a discharge port at the bottom of the ash hopper.
The two heat exchangers can be connected in parallel, namely, cold air inlet pipes of the two heat exchangers are connected with a cold air input pipeline, and hot air outlet pipes of the two heat exchangers are connected with a hot air output pipeline; two heat exchangers can also be connected in series, namely a cold air inlet pipe of a first heat exchanger is connected with a cold air input pipeline, a hot air outlet pipe is connected with a cold air inlet pipe of a second heat exchanger, and a hot air outlet pipe of the second heat exchanger is connected with a hot air output pipeline. The first heat exchangers, which are connected in series with one another, are preferably located downstream of the second heat exchanger, in order to facilitate an increase in the temperature of the hot air.
Multistage heating can be realized through the series connection of a plurality of heat exchangers to obtain higher hot air temperature, can carry out the setting and the interconnect mode of heat exchanger (if be equipped with a plurality of heat exchangers) according to actual need.
The filtered cold air is driven by a fan to be sent into the heat exchangers through a cold air input pipeline 28, hot air outlet pipes of the heat exchangers are connected into a high-temperature air output pipeline 27 and are connected into an ammonia water gasification device 26 through pipelines to be used as a heat medium for ammonia water gasification, the ammonia water gasification device directly heated by the high-temperature air can be preferably adopted, the ammonia water is atomized and sprayed into the ammonia water gasification device through a spray gun and is mixed with the high-temperature air in the device, the ammonia water is gasified to form ammonia gas, and mixed gas of air, the ammonia gas and water vapor (from water gasification in the ammonia water) is formed and is used as the ammonia gas of the ammonia injection grid.
The working principle of the novel gas-gas heat exchanger is as follows: cold air enters the cold air header through the cold air inlet pipe, and then enters each heat exchange pipe in a multi-path mode, a hot flue gas channel (a flue in the SCR system or a flue outside the SCR system) is arranged outside each heat exchange pipe, and cold air in each heat exchange pipe and hot flue gas outside the heat exchange pipe are subjected to heat exchange, heated and then enter the hot air header and finally discharged through the hot air outlet pipe. And sending the hot air into a hot air output pipeline. The embodiment shown in fig. 4 and 5 is two layers of heat exchange tube rows, and the upper and lower layers of heat exchange straight tubes forming the same heat exchange branch in the two layers of heat exchange tube rows are connected through 180-degree elbows. The arrangement, the number and the number of the heat exchange tube rows can be adjusted according to specific heat exchange requirements, and single-layer or multi-layer heat exchange tube rows can be arranged.
The heat exchanger of the utility model has the following characteristics and technical advantages:
1) the heat exchange tube of the novel gas-gas heat exchanger adopts the vortex tube, has a unique vortex structure, increases the heating area compared with a light tube, enhances the heat transfer capacity or improves the heat transfer capacity by 2-3 times compared with the light tube under the same resistance condition, can improve the utilization rate of the waste heat of the flue gas, and reduces the energy waste;
2) the temperature of the high pipe wall (the pipe wall of the heat exchange pipe) in the flue gas is favorable for preventing low-temperature condensation, dust formation and acid corrosion, and is particularly suitable for being used in a high-dust environment;
3) the heat exchanger is arranged in the flue flow and has a turbulent flow function, so that ammonia gas and flue gas are mixed more uniformly, the denitration efficiency is improved, and ammonia escape is reduced;
4) each connecting/connecting piece can adopt a welding structure, and has the advantages of simple structure, small occupied area and convenient installation.
5) The upper part of the heat exchange tube is provided with the anti-abrasion angle steel, so that the deposition of dust in flue gas on the heat exchange tube can be effectively prevented, the reduction of the heat exchange efficiency of the heat exchange tube is prevented, and meanwhile, the abrasion of smoke dust on the heat exchange tube can be reduced.
In the expression of the direction of the heat exchange straight pipes, the extending direction of the heat exchange straight pipes is taken as the transverse direction, the direction corresponding to the extending direction of a flue or the overall flowing direction of flue gas when the heat exchange straight pipes are installed and used is taken as the vertical direction, the direction perpendicular to the transverse direction and the vertical direction is taken as the longitudinal direction, and the transverse direction and the longitudinal direction of each layer are respectively determined according to the extending direction of each layer of the heat exchange straight pipes under the condition that the extending directions of different layers of the heat exchange straight pipes are different.
The technical means disclosed by the utility model can be combined arbitrarily to form a plurality of different technical schemes except for special description and the further limitation that one technical means is another technical means.

Claims (10)

1. A novel gas-gas heat exchanger for high-dust environment is characterized in that a plurality of heat exchange straight pipes are arranged, the heat exchange straight pipes adopt a single-layer distribution mode or a multi-layer distribution mode, the heat exchange straight pipes positioned on the same layer are mutually parallel, the heat exchange straight pipes positioned on different layers are mutually parallel or not mutually parallel, in the single-layer distribution mode, each heat exchange straight pipe forms a heat exchange branch, two ends of each heat exchange straight pipe are respectively connected with a cold air header and a hot air header, in the multilayer distribution mode, the number of the heat exchange straight pipes of each layer is equal, the heat exchange straight pipes which are longitudinally positioned in the same arrangement sequence are mutually connected in series to form a heat exchange branch, the pipe orifices which are positioned on the heat exchange straight pipes of the first layer and the last layer in the vertical direction and are not connected with other heat exchange straight pipes are respectively connected with a cold air header and a hot air header, and the heat exchange straight pipes adopt vortex joint pipes.
2. A novel gas-gas heat exchanger for high dust environment as claimed in claim 1, characterized by having a support frame on which said heat exchange straight pipes, cold air header and hot air header are mounted.
3. A novel gas-gas heat exchanger for high dust environment as claimed in claim 2, characterized in that said support frame comprises a support plate and two side frames, said support plate is vertically arranged, and both ends of said support plate are respectively and fixedly connected to said two side frames, said support plate is provided with through holes for passing and supporting said heat exchange straight pipes, said heat exchange straight pipes pass through the corresponding through holes of said support plate and are supported on the corresponding through holes.
4. A novel air-to-air heat exchanger for high dust environments as claimed in claim 1 wherein the cold air collection box and the hot air collection box are provided with a cold air inlet duct and a hot air outlet duct, respectively.
5. A novel gas-gas heat exchanger for use in high dust environments as claimed in claim 1, wherein the layers of straight heat exchange tubes in a multi-layer arrangement have the same direction of extension, and the layers of straight heat exchange tubes used to form the same heat exchange branch are connected end to end by 180 ° bends.
6. A novel gas-gas heat exchanger for use in a high dust environment as claimed in claim 1, wherein the heat exchange straight pipes in each layer are arranged in a multi-layer arrangement in the same direction of extension, and the heat exchange straight pipes in adjacent layers are arranged in a longitudinally staggered arrangement.
7. A novel air-to-air heat exchanger for high dust environments as claimed in claim 1 wherein said cold air header and said hot air header are cylindrical with rectangular or circular cross-sections.
8. A novel gas-gas heat exchanger for high dust environment as claimed in claim 4, characterized in that the cold air input pipeline connected with the cold air inlet pipe is provided with a fan and a regulating valve, and the hot air output pipeline connected with the hot air outlet pipe is provided with a temperature monitoring device.
9. Novel SCR system for high dust environments, characterized in that it comprises:
the ammonia spraying grid is arranged in the flue, is provided with an ammonia gas nozzle or an ammonia spraying hole and is connected with an ammonia gas source through a pipeline;
the ammonia source is positioned outside the flue and is provided with ammonia water gasification equipment, and the ammonia water gasification equipment is provided with a high-temperature air inlet;
high-temperature air preparation equipment adopts the novel gas-gas heat exchanger for the high-dust environment as claimed in any one of claims 1 to 8, the novel gas-gas heat exchanger for the high-dust environment is installed in the flue and is positioned at the downstream of the ammonia injection grid, and the high-temperature air output of the hot air header is connected to the high-temperature air inlet of the ammonia water gasification equipment.
10. The novel SCR system for high dust environment as recited in claim 9, wherein the number of said novel gas-gas heat exchanger for high dust environment is two, the extension direction of each heat exchange straight pipe in the same novel gas-gas heat exchanger for high dust environment is the same, the extension directions of the heat exchange straight pipes in the two novel gas-gas heat exchangers for high dust environment are perpendicular to each other, and a space is left between the two novel gas-gas heat exchangers for high dust environment.
CN202121780350.6U 2021-08-02 2021-08-02 Novel gas-gas heat exchanger and novel SCR (selective catalytic reduction) system for high-dust environment Active CN215863497U (en)

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CN202121780350.6U CN215863497U (en) 2021-08-02 2021-08-02 Novel gas-gas heat exchanger and novel SCR (selective catalytic reduction) system for high-dust environment

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Application Number Priority Date Filing Date Title
CN202121780350.6U CN215863497U (en) 2021-08-02 2021-08-02 Novel gas-gas heat exchanger and novel SCR (selective catalytic reduction) system for high-dust environment

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