CN112728974A - Glass tube heat exchanger capable of preventing dust deposition and blocking and application thereof - Google Patents
Glass tube heat exchanger capable of preventing dust deposition and blocking and application thereof Download PDFInfo
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- CN112728974A CN112728974A CN202110003693.XA CN202110003693A CN112728974A CN 112728974 A CN112728974 A CN 112728974A CN 202110003693 A CN202110003693 A CN 202110003693A CN 112728974 A CN112728974 A CN 112728974A
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- flue gas
- heat exchange
- heat exchanger
- tail gas
- tube
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- 239000000428 dust Substances 0.000 title claims abstract description 59
- 239000011521 glass Substances 0.000 title claims abstract description 39
- 230000000903 blocking effect Effects 0.000 title claims abstract description 18
- 230000008021 deposition Effects 0.000 title claims description 23
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 81
- 239000003546 flue gas Substances 0.000 claims abstract description 81
- 239000007789 gas Substances 0.000 claims description 58
- 238000010926 purge Methods 0.000 claims description 18
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 17
- 238000011084 recovery Methods 0.000 claims description 15
- 239000002918 waste heat Substances 0.000 claims description 15
- 229910052717 sulfur Inorganic materials 0.000 claims description 14
- 239000011593 sulfur Substances 0.000 claims description 14
- 238000004523 catalytic cracking Methods 0.000 claims description 13
- 239000004071 soot Substances 0.000 claims description 8
- 238000006477 desulfuration reaction Methods 0.000 claims description 6
- 230000023556 desulfurization Effects 0.000 claims description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 5
- 239000005388 borosilicate glass Substances 0.000 claims description 4
- 238000010408 sweeping Methods 0.000 claims description 2
- 150000003839 salts Chemical class 0.000 abstract description 15
- 238000007599 discharging Methods 0.000 abstract description 12
- 238000001816 cooling Methods 0.000 abstract description 9
- 238000000034 method Methods 0.000 abstract description 8
- 238000009825 accumulation Methods 0.000 abstract 1
- 238000000151 deposition Methods 0.000 description 19
- 238000012546 transfer Methods 0.000 description 10
- 238000002425 crystallisation Methods 0.000 description 8
- 230000008025 crystallization Effects 0.000 description 8
- 239000013078 crystal Substances 0.000 description 7
- 238000005457 optimization Methods 0.000 description 6
- 239000000779 smoke Substances 0.000 description 6
- 230000000694 effects Effects 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 239000005864 Sulphur Substances 0.000 description 3
- 238000007664 blowing Methods 0.000 description 3
- 230000005484 gravity Effects 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005194 fractionation Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 238000011069 regeneration method Methods 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
- 241000270295 Serpentes Species 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 239000002283 diesel fuel Substances 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- -1 polytetrafluoroethylene Polymers 0.000 description 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
- 239000004810 polytetrafluoroethylene Substances 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
- F28D7/16—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged in parallel spaced relation
- F28D7/1615—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged in parallel spaced relation the conduits being inside a casing and extending at an angle to the longitudinal axis of the casing; the conduits crossing the conduit for the other heat exchange medium
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/06—Arrangements of devices for treating smoke or fumes of coolers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L15/00—Heating of air supplied for combustion
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F21/00—Constructions of heat-exchange apparatus characterised by the selection of particular materials
- F28F21/006—Constructions of heat-exchange apparatus characterised by the selection of particular materials of glass
-
- 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
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Chimneys And Flues (AREA)
Abstract
The invention relates to a glass tube heat exchanger capable of preventing dust accumulation from blocking and an application thereof. According to the invention, the dust collecting hopper is arranged at the bottom of the heat exchanger, so that dust mixed with flue gas and crystallized salt precipitated by cooling can be collected and discharged at regular time in the heat exchange process, and the problem of reduction of heat exchange efficiency caused by the fact that the dust and the crystallized salt are attached to the pipe wall of the heat exchange pipe due to incapability of discharging is avoided.
Description
Technical Field
The invention relates to the technical field of heat exchange equipment, in particular to a glass tube heat exchanger capable of preventing dust deposition and blocking and application thereof.
Background
In the current industrial production, various heat exchangers are widely used for heat exchange, and the shell-and-tube heat exchanger is most commonly used. Catalytic cracking is an important secondary processing in the oil refining process, and is an important means for improving the yield of light oil, producing high-octane gasoline and producing more diesel oil. The catalytic cracking device can emit a large amount of high-temperature flue gas in the catalytic cracking reaction process, the waste heat boiler is a main device for recovering the waste heat of the catalytic cracking device in petrochemical enterprises, the temperature of the flue gas at the outlet of the catalytic cracking waste heat boiler is 200-220 ℃, and the working condition of 260 ℃ is short-term. The flue gas contains catalyst dust. In the cooling process of the flue gas which is not desulfurized, sulfate and other crystals are separated out, and the heat exchanger is easily blocked by the crystals and dust.
Disclosure of Invention
The invention aims to solve the problems and provide a glass tube heat exchanger capable of preventing dust deposition from blocking and an application thereof.
The invention realizes the purpose through the following technical scheme: the utility model provides a prevent deposition and block up glass tube heat exchanger, includes the casing, is provided with flue gas inlet and outlet and air inlet and outlet on the casing respectively, is equipped with glass heat exchange tube assembly in the casing, and glass heat exchange tube assembly' S both ends communicate with air inlet and outlet respectively, the lower part of casing is provided with the ash collecting bucket, and the lower extreme ash discharging port department of ash collecting bucket is provided with the dust valve, is provided with in the ash collecting bucket and sweeps the pipe, sweeps pipe one end and stretches out the ash collecting bucket and be connected with the air supply, sweeps and it has a plurality of sweeping holes to distribute on the body that the pipe is located the ash collecting bucket, the heat exchange tube in the glass heat exchange tube assembly is the square and arranges, and satisfies the following condition: s is more than or equal to D by 1.21, so that the flow velocity of the medium outside the pipe is between 8 and 15 m/S.
The invention relates to a further optimization of a glass tube heat exchanger capable of preventing dust deposition and blocking: the clear distance between adjacent heat exchange tubes is more than or equal to 8 mm.
The invention relates to a further optimization of a glass tube heat exchanger capable of preventing dust deposition and blocking: the heat exchange tube is made of quartz glass or high borosilicate glass.
The invention relates to a further optimization of a glass tube heat exchanger capable of preventing dust deposition and blocking: the heat exchange tubes and the flue gas flow channel are both horizontally arranged.
The invention relates to a further optimization of a glass tube heat exchanger capable of preventing dust deposition and blocking: a smoke baffle is arranged in the ash collecting hopper, the smoke baffle is parallel to the heat exchange tube, the upper end of the smoke baffle is parallel to the upper end of the ash collecting hopper, and the lower end of the smoke baffle is arranged above the purging tube.
The invention relates to a further optimization of a glass tube heat exchanger capable of preventing dust deposition and blocking: the heat exchange tubes are horizontally arranged, and a flue gas flow channel is L-shaped;
the flue gas inlet is positioned on the side wall of the ash collecting hopper, and the flue gas outlet is positioned on the upper end surface of the shell;
or the flue gas outlet is positioned on the side wall of the dust collecting hopper, and the flue gas inlet is positioned on the upper end surface of the shell.
The invention relates to a further optimization of a glass tube heat exchanger capable of preventing dust deposition and blocking: the tube pass of the heat exchange tube is in U-shaped or snakelike multi-flow arrangement, the air inlet and the air outlet are respectively arranged on the end face of the shell, and the flue gas flow channel is in horizontal arrangement.
The invention discloses an application of a glass tube heat exchanger for preventing dust deposition and blockage in a catalytic cracking device, which comprises the following steps: and a glass tube heat exchanger for preventing dust deposition from blocking is arranged on a flue gas outlet pipeline of the waste heat boiler.
The invention discloses an application of a glass tube heat exchanger for preventing dust deposition and blockage in a sulfur recovery tail gas treatment system, which comprises the following steps: the sulfur recovery tail gas treatment system comprises a tail gas preheater, a tail gas heater, a tail gas incinerator, a waste heat boiler, a cooler and desulfurization equipment, wherein sulfur-containing tail gas enters the tail gas incinerator after being subjected to heat exchange with flue gas through the tail gas preheater and the tail gas heater, high-temperature flue gas generated by the tail gas incinerator sequentially enters the tail gas heater and the tail gas preheater after passing through the waste heat boiler to perform heat exchange with the sulfur-containing tail gas, the flue gas of the tail gas preheater is cooled through the cooler and then enters the desulfurization equipment, and the tail gas preheater is a glass tube heat exchanger capable of.
Advantageous effects
The dust collecting hopper is arranged at the bottom of the heat exchanger, so that dust mixed with flue gas and crystallized salt precipitated by cooling can be collected and discharged at regular time in the heat exchange process, the problem that the heat exchange efficiency is reduced because the dust and the crystallized salt are attached to the pipe wall of a heat exchange pipe due to incapability of discharging is solved, and the dust collecting hopper has a good application prospect in a catalytic cracking device and a sulfur recovery tail gas treatment system;
secondly, a flue gas baffle is arranged in a dust hopper of the heat exchanger, so that flue gas is subjected to heat exchange through a heat exchange pipe area, and the influence of the dust hopper on the heat exchange efficiency is avoided;
the distribution mode and the tube spacing of the heat exchange tubes of the heat exchanger are specially limited, so that the flow velocity of flue gas outside the tubes is 8-15m/s, and the design is matched with the dust exhaust structure of the heat exchanger, so that the phenomenon that particles in the flue gas are crystallized and attached to the surfaces of the heat exchange tubes to influence the heat exchange efficiency of the heat exchanger can be avoided;
the heat exchange tube of the heat exchanger is made of quartz glass or high borosilicate glass, the glass heat exchange tube has high corrosion resistance, the outer surface of the glass heat exchange tube is smooth, and dust and crystallized salt are not easy to attach to the outside of the heat exchange tube.
Drawings
FIG. 1 is a schematic view I of the internal structure of a heat exchanger in example 1;
FIG. 2 is a schematic view II of the internal structure of the heat exchanger in example 1;
FIG. 3 is a schematic view of the external structure of a heat exchanger according to embodiment 1;
FIG. 4 is a schematic view I of the internal structure of a heat exchanger according to embodiment 2;
FIG. 5 is a schematic view II of the internal structure of a heat exchanger in example 2;
FIG. 6 is a schematic view of the external structure of a heat exchanger according to embodiment 3;
FIG. 7 is a schematic diagram showing the positional relationship of the heat exchanger in the catalytic cracking unit in example 4;
FIG. 8 is a schematic view of a configuration of a tail gas treatment system of the sulfur recovery tail gas treatment system in embodiment 5;
FIG. 9 is a schematic structural view of a tail gas treatment system of the sulfur recovery tail gas treatment system in embodiment 6;
FIG. 10 is a view showing the state of a heat exchange tube after a period of operation of a conventional heat exchanger;
FIG. 11 is a state view of the heat exchange tube after a period of operation of the heat exchanger of the present invention;
reference numerals: 1. the device comprises a shell, 2, a flue gas inlet, 3, a flue gas outlet, 4, an air inlet, 5, an air outlet, 6, a heat exchange tube, 7, an ash collecting hopper, 8, an ash discharging port, 9, an ash discharging valve, 10, a purging tube, 11, a purging hole, 12 and a flue gas baffle.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
Example 1
As shown in fig. 1 to 3, a glass tube heat exchanger for preventing soot deposition comprises a housing 1. The shell 1 is provided with a flue gas inlet and outlet 2,3 and an air inlet and outlet 4,5 respectively, a heat exchange tube 6 is arranged in the shell 1, the heat exchange tube 6 is made of quartz glass, and two ends of the heat exchange tube 6 are communicated with the air inlet and outlet 4,5 respectively. The heat exchange tube 6 and the flue gas flow channel are both horizontally arranged, the lower part of the shell 1 is provided with an ash collecting hopper 7, an ash discharging valve 9 is arranged at an ash discharging port 8 at the lower end of the ash collecting hopper 7, a purging tube 10 is arranged in the ash collecting hopper 7, one end of the purging tube 10 extends out of the ash collecting hopper 7 to be connected with an air source, and two rows of symmetric purging holes 11 are uniformly distributed on the side wall of the tube body of the purging tube 10 in the ash collecting hopper 7 along the length direction of the side wall.
The heat exchange tubes in the glass heat exchange tube assembly are arranged in a square shape, and the tube space S of the heat exchange tubes and the outer diameter D of the heat exchange tubes meet the following conditions: s is more than or equal to D x 1.21, and the net distance between adjacent heat exchange tubes is more than or equal to 8mm, so that the flow velocity of the medium outside the tubes is between 8 and 15 m/S. The design is matched with the dust exhaust structure provided by the invention, so that the phenomenon that the heat exchange efficiency of the heat exchanger is influenced because particles in the flue gas are crystallized and attached to the surface of the heat exchange tube can be avoided. As shown in fig. 10 and 11, after a conventional heat exchanger is operated for a period of time, a large amount of crystals are attached to the surface of the heat exchange tube, and the crystals can seriously affect the heat exchange efficiency of the heat exchange tube and reduce the working efficiency of the heat exchanger. After the heat exchanger of the invention operates for a period of time, only one layer of floating ash exists on the surface of the heat exchange tube, and the condition of crystal adhesion does not occur.
When a large amount of dust and crystal salt are accumulated in the dust collecting hopper 7, the dust discharging valve 9 is opened to discharge the dust and the crystal salt from the dust collecting hopper 7 under the action of gravity, and if the dust in the dust collecting hopper 7 is agglomerated and cannot be smoothly discharged, high-pressure gas is blown out from the blowing holes 11 on the two sides of the pipe body by blowing the high-pressure gas into the blowing pipe 10, so that the agglomerated dust is scattered and loosened, and the agglomerated dust is smoothly discharged out of the dust collecting hopper 7.
Two flue gas baffles 12 are arranged in the ash collecting hopper 7 side by side, the flue gas baffles 12 are parallel to the heat exchange tube 6, the upper ends of the flue gas baffles 12 are parallel to the upper end of the ash collecting hopper 7, and the lower ends of the flue gas baffles 12 are arranged above the purging tube 10. The flue gas baffle 12 plays the effect of preventing the flue gas short circuit, that is to say, avoids the flue gas not pass through the heat transfer region and directly discharge by the exhanst gas outlet, through the setting of flue gas baffle 12, makes the flue gas all carry out the heat transfer through the heat exchange tube region, avoids the influence of dust hopper to the heat exchange efficiency.
The inner wall of the dust collecting hopper 7 and the two side walls of the smoke baffle 12 are both provided with polytetrafluoroethylene coatings, so that dust can be prevented from being accumulated on the dust collecting hopper 7 and the smoke baffle 1.
Example 2
As shown in fig. 4 and 5, a glass tube heat exchanger for preventing soot clogging includes a case 1. The shell 1 is provided with a flue gas inlet and outlet 2,3 and an air inlet and outlet 4,5 respectively, a heat exchange tube 6 is arranged in the shell 1, the heat exchange tube 6 is made of high borosilicate glass, and two ends of the heat exchange tube 6 are communicated with the air inlet and outlet 4,5 respectively. The heat exchange tube 6 is horizontally arranged, the flue gas flow channel is L-shaped, the flue gas inlet 2 is positioned on the side wall of the ash collecting hopper 7, and the flue gas outlet 3 is positioned on the upper end face of the shell 1. The lower part of the shell 1 is provided with an ash collecting hopper 7, an ash discharging valve 9 is arranged at an ash discharging port 8 at the lower end of the ash collecting hopper 7, a purging pipe 10 is arranged in the ash collecting hopper 7, one end of the purging pipe 10 extends out of the ash collecting hopper 7 to be connected with an air source, and two rows of symmetric purging holes 11 are uniformly distributed on the side wall of a pipe body of the purging pipe 10 in the ash collecting hopper 7 along the length direction of the pipe body. The flue gas is got into the heat transfer region by the lower part of casing 1, carries out the heat transfer with the air in the heat exchange tube, and the flue gas after the cooling is discharged by casing 1 upper portion, and at the heat transfer in-process, the dust that the flue gas mix with and the crystallization salt that the cooling is appeared drop to the dust hopper 7 in under the action of gravity, avoid dust and crystallization salt to be attached to the pipe wall of heat exchange tube because of unable discharge, and then lead to heat exchange efficiency to reduce.
Example 3
As shown in fig. 6, the glass tube heat exchanger for preventing the dust from being blocked comprises a shell 1. The shell 1 is provided with a flue gas inlet and outlet 2,3 and an air inlet and outlet 4,5 respectively, a heat exchange tube 6 is arranged in the shell 1, the heat exchange tube 6 is made of quartz glass, and two ends of the heat exchange tube 6 are communicated with the air inlet and outlet 4,5 respectively. The heat exchange tubes 6 are arranged in a U shape or a snake shape, the air inlets and the air outlets 4 and 5 are both arranged on the upper end face of the shell 1, and the flue gas flow channel is arranged horizontally. The lower part of the shell 1 is provided with an ash collecting hopper 7, an ash discharging valve 9 is arranged at an ash discharging port 8 at the lower end of the ash collecting hopper 7, a purging pipe 10 is arranged in the ash collecting hopper 7, one end of the purging pipe 10 extends out of the ash collecting hopper 7 to be connected with an air source, and two rows of symmetric purging holes 11 are uniformly distributed on the side wall of a pipe body of the purging pipe 10 in the ash collecting hopper 7 along the length direction. Two flue gas baffles 12 are arranged in the ash collecting hopper 7 side by side, the flue gas baffles 12 are parallel to the heat exchange tube 6, the upper ends of the flue gas baffles 12 are parallel to the upper end of the ash collecting hopper 7, and the lower ends of the flue gas baffles 12 are arranged above the purging tube 10.
The flue gas is got into the heat transfer region by the left side of casing 1, carries out the heat transfer with the air in the heat exchange tube, and the flue gas after the cooling is discharged by casing 1 right side, and at the heat transfer in-process, the dust that the flue gas mix with and the crystallization salt that the cooling is appeared drop to the dust hopper 7 in under the action of gravity, avoid dust and crystallization salt to be attached to the pipe wall of heat exchange tube because of unable discharge, and then lead to heat exchange efficiency to reduce.
Example 4
As shown in FIG. 7, the whole structure of the catalytic cracking unit with the plate-tube heat exchanger for preventing ash deposition from blocking is the prior art, and can be in the structural form of the catalytic cracking unit commonly used in the prior art. The catalytic cracking unit in this embodiment includes a reaction-regeneration system, a fractionation system, an absorption-stabilization system, and a flue gas energy recovery system. It should be noted that, since the reaction-regeneration system, the fractionation system, the absorption-stabilization system, and the flue gas energy recovery system are all in the prior art, unlike the prior art, in this embodiment, a heat exchanger (any one of embodiments 1 to 3) with dust deposition prevention and blockage prevention is disposed on the flue gas outlet pipeline of the waste heat boiler of the flue gas energy recovery system, so that only the schematic diagram of the waste heat boiler in the flue gas energy recovery system is shown in fig. 7.
The heat exchanger can collect and regularly discharge the dust that the flue gas was mingled with and the crystallization salt that the cooling was appeared at the in-process of heat transfer, avoids dust and crystallization salt because of unable discharge attached to the pipe wall of heat exchange tube, leads to heat exchange efficiency to reduce, and then influences the problem of waste heat recovery effect among the catalytic cracking unit.
Example 5
As shown in fig. 8, a sulfur recovery tail gas treatment system with a plate-tube heat exchanger capable of preventing ash deposition blocking comprises a tail gas preheater, a tail gas heater, a tail gas incinerator, a waste heat boiler, a cooler and a desulfurization device, wherein sulfur-containing tail gas enters the tail gas incinerator after exchanging heat with flue gas through the tail gas preheater and the tail gas heater, high-temperature flue gas generated by the tail gas incinerator enters the tail gas heater and the tail gas preheater sequentially after passing through the waste heat boiler to exchange heat with the sulfur-containing tail gas, the flue gas of the tail gas preheater enters the desulfurization device after being cooled by the cooler, and the tail gas preheater is a heat exchanger capable of preventing ash deposition blocking (any one of embodiments.
The heat exchanger can collect and regularly discharge the dust that the flue gas was mingled with and the crystallization salt that the cooling was appeared at the in-process of heat transfer, avoids dust and crystallization salt because of unable discharge attached to the pipe wall of heat exchange tube, leads to heat exchange efficiency to reduce, and then influences the problem of waste heat recovery effect among the sulphur recovery tail gas processing system.
Example 6
As shown in fig. 9: the utility model provides a tail gas processing system is retrieved to sulphur of heat exchanger is prevented depositing in area, the sulphur of this embodiment is retrieved tail gas processing system and embodiment 5 is basically the same, the difference lies in: the tail gas preheater also comprises an air heat exchange tube and an air inlet and outlet, two ends of the air heat exchange tube are respectively communicated with the air inlet and outlet, one part of the air enters a burner of the tail gas incinerator for supporting combustion after entering the tail gas preheater and exchanging heat with flue gas, and the other part of the air is mixed with the desulfurized wet flue gas for white discharge elimination.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (9)
1. The utility model provides a prevent that deposition blocks up glass tube heat exchanger, includes casing (1), is provided with flue gas inlet and outlet (2,3) and air inlet and outlet (4,5) on casing (1) respectively, is equipped with glass heat exchange tube assembly in casing (1), and glass heat exchange tube assembly's both ends are imported and exported (4,5) intercommunication, its characterized in that with the air respectively: the lower part of casing (1) is provided with ash collection bucket (7), and the lower extreme ash discharge mouth (8) department of ash collection bucket (7) is provided with ash valve (9), is provided with in ash collection bucket (7) and sweeps pipe (10), sweeps pipe (10) one end and stretches out ash collection bucket (7) and be connected with the air supply, and it has a plurality of sweeping holes (11) to sweep pipe (10) and distribute on being located ash collection bucket (7) body, heat exchange tube (6) among the glass heat exchange tube subassembly are the square and arrange, and satisfy following condition between the external diameter D of the tube pitch S of heat exchange tube (6) and heat exchange tube (6): s is more than or equal to D by 1.21, so that the flow velocity of the medium outside the pipe is between 8 and 15 m/S.
2. The glass tube heat exchanger for preventing soot clogging as defined in claim 1, wherein: the clear distance between the adjacent heat exchange tubes (6) is more than or equal to 8 mm.
3. The glass tube heat exchanger for preventing soot clogging as defined in claim 1, wherein: the heat exchange tube (6) is made of quartz glass or high borosilicate glass.
4. The glass tube heat exchanger for preventing soot clogging as defined in claim 1, 2 or 3, wherein: the heat exchange tubes (6) and the flue gas flow channel are both horizontally arranged.
5. The glass tube heat exchanger for preventing soot clogging as defined in claim 4, wherein: a flue gas baffle (12) is arranged in the ash collecting hopper (7), the flue gas baffle (12) is parallel to the heat exchange tube (6), the upper end of the flue gas baffle (12) is parallel to the upper end of the ash collecting hopper (7), and the lower end of the flue gas baffle (12) is arranged above the purging tube (10).
6. The glass tube heat exchanger for preventing soot clogging as defined in claim 1, wherein: the heat exchange tubes (6) are horizontally arranged, and a flue gas flow channel is L-shaped;
the flue gas inlet (2) is positioned on the side wall of the ash collecting hopper (7), and the flue gas outlet (3) is positioned on the upper end face of the shell (1);
or the flue gas outlet (3) is positioned on the side wall of the dust collecting hopper (7), and the flue gas inlet (2) is positioned on the upper end face of the shell (1).
7. The glass tube heat exchanger for preventing soot clogging as defined in claim 1, wherein: the tube pass of the heat exchange tube (6) is in U-shaped or snakelike multi-flow arrangement, the air inlet and outlet (4,5) are respectively arranged on the end face of the shell (1), and the flue gas flow channel is in horizontal arrangement.
8. The use of the soot-clogging preventing glass tube heat exchanger according to claim 1 in a catalytic cracking apparatus, wherein: and a glass tube heat exchanger for preventing dust deposition from blocking is arranged on a flue gas outlet pipeline of the waste heat boiler.
9. The use of the glass tube heat exchanger for preventing ash deposition blocking according to claim 1 in a sulfur recovery tail gas treatment system, the sulfur recovery tail gas treatment system comprises a tail gas preheater, a tail gas heater, a tail gas incinerator, a waste heat boiler, a cooler and a desulfurization device, the sulfur-containing tail gas enters the tail gas incinerator after exchanging heat with flue gas through the tail gas preheater and the tail gas heater, high-temperature flue gas generated by the tail gas incinerator enters the tail gas heater and the tail gas preheater sequentially after passing through the waste heat boiler to exchange heat with the sulfur-containing tail gas, and the flue gas of the tail gas preheater enters the desulfurization device after being cooled by the cooler, wherein: the tail gas preheater is a glass tube heat exchanger capable of preventing dust deposition from blocking.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110003693.XA CN112728974A (en) | 2021-01-04 | 2021-01-04 | Glass tube heat exchanger capable of preventing dust deposition and blocking and application thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110003693.XA CN112728974A (en) | 2021-01-04 | 2021-01-04 | Glass tube heat exchanger capable of preventing dust deposition and blocking and application thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116428736A (en) * | 2023-05-17 | 2023-07-14 | 北京中科润宇环保科技股份有限公司 | Anti-blocking and anti-corrosion efficient heat exchange air duct type electric heater |
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| CN116428736A (en) * | 2023-05-17 | 2023-07-14 | 北京中科润宇环保科技股份有限公司 | Anti-blocking and anti-corrosion efficient heat exchange air duct type electric heater |
| CN116428736B (en) * | 2023-05-17 | 2023-12-05 | 北京中科润宇环保科技股份有限公司 | Anti-blocking and anti-corrosion efficient heat exchange air duct type electric heater |
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