CN113483596A - Dry ice cleaning method and dry ice cleaning machine for furnace tube - Google Patents
Dry ice cleaning method and dry ice cleaning machine for furnace tube Download PDFInfo
- Publication number
- CN113483596A CN113483596A CN202110929229.3A CN202110929229A CN113483596A CN 113483596 A CN113483596 A CN 113483596A CN 202110929229 A CN202110929229 A CN 202110929229A CN 113483596 A CN113483596 A CN 113483596A
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- Prior art keywords
- dry ice
- nozzle
- ice cleaning
- hopper
- economizer
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- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 title claims abstract description 57
- 235000011089 carbon dioxide Nutrition 0.000 title claims abstract description 55
- 238000004140 cleaning Methods 0.000 title claims abstract description 49
- 238000000034 method Methods 0.000 title claims abstract description 23
- 239000002918 waste heat Substances 0.000 claims abstract description 20
- 239000007921 spray Substances 0.000 claims abstract description 12
- 238000009792 diffusion process Methods 0.000 claims abstract description 8
- 238000003756 stirring Methods 0.000 claims abstract description 6
- 238000011084 recovery Methods 0.000 abstract description 9
- 230000000694 effects Effects 0.000 abstract description 5
- 238000010977 unit operation Methods 0.000 abstract description 3
- 239000002699 waste material Substances 0.000 description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 9
- 239000002245 particle Substances 0.000 description 8
- 238000005406 washing Methods 0.000 description 8
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 5
- 239000003153 chemical reaction reagent Substances 0.000 description 5
- 239000003546 flue gas Substances 0.000 description 5
- 239000007788 liquid Substances 0.000 description 3
- 239000000779 smoke Substances 0.000 description 3
- 239000002912 waste gas Substances 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 239000013043 chemical agent Substances 0.000 description 1
- 238000012824 chemical production Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 230000009849 deactivation Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 238000002309 gasification Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000004071 soot Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28G—CLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OR BOILERS
- F28G13/00—Appliances or processes not covered by groups F28G1/00 - F28G11/00; Combinations of appliances or processes covered by groups F28G1/00 - F28G11/00
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C19/00—Other disintegrating devices or methods
- B02C19/16—Mills provided with vibrators
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C4/00—Crushing or disintegrating by roller mills
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28G—CLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OR BOILERS
- F28G15/00—Details
- F28G15/04—Feeding and driving arrangements, e.g. power operation
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Cleaning In General (AREA)
Abstract
The invention belongs to the field of petrochemical equipment cleaning, and particularly relates to a dry ice cleaning method and a dry ice cleaning machine for a furnace tube. The spray gun comprises a main box body, a hopper, a vibrator, a stirring roller, a flow sensor, a feeding box, an air lock feeder, a high-speed air pipeline, a T-shaped groove, a high-speed air nozzle, a hose and a spray gun, wherein a spray gun head is provided with a convergence and diversion nozzle which is provided with a nozzle joint, a nozzle neck, a first diffusion part of the nozzle and a second diffusion part of the nozzle. The corresponding dry ice cleaning method comprises the steps of putting dry ice into a hopper, conveying compressed air to a high-speed air pipeline after the compressed air is sequentially processed by an air compressor and a dryer, aligning a convergent-divergent nozzle to a scaling position of an economizer, and operating the dry ice cleaning machine to start cleaning. The problem that the heat recovery efficiency and even the unit operation safety are seriously affected by the accumulated scale of the economizer after the waste heat boiler is used for a long time is solved, and the problem that the traditional cleaning method is poor in effect is solved.
Description
Technical Field
The invention belongs to the field of petrochemical equipment cleaning, and particularly relates to a dry ice cleaning method and a dry ice cleaning machine for a furnace tube.
Background
Petrochemical equipment often needs to use various furnace tubes such as waste heat boilers, economizers, convection chambers, and the like. The waste heat boiler is a boiler which recovers waste heat in waste gas, waste material or waste liquid generated in chemical production and heat generated after combustion of combustible substances thereof, and produces hot water or steam for other sections by utilizing the recovered heat. The high-temperature flue gas generated by burning fuel oil, fuel gas and fire coal releases heat, enters the hearth, then enters the waste heat recovery device of the front smoke box, then enters the smoke and fire tube, and finally enters the waste heat recovery device in the flue of the rear smoke box, and the high-temperature flue gas is changed into low-temperature flue gas which is discharged into the atmosphere through the chimney. The waste heat boiler greatly improves the utilization rate of heat released by fuel combustion, so the boiler is energy-saving.
The economizer is a device which is arranged at the lower part of a pipeline at the tail part of the boiler and used for recovering waste heat, reduces the discharge temperature of waste gas, waste materials or waste liquid by absorbing the heat of high-temperature waste, saves energy and improves efficiency, so the economizer is called as an economizer, and the heating surface of the economizer is generally a snakelike finned tube and is the most important heat recovery device in the waste heat boiler.
After the waste heat boiler is used for a long time, the boiler tubes of an economizer, a convection chamber and the like are seriously scaled, the surface attachments are mostly semi-hardened coked materials, the scale layer is hard, the thickness often reaches 10mm-30mm, and the surface of the boiler tube is basically invisible in the primary color of metal. These incrustations can greatly influence the result of use of economizer, can reduce waste heat recovery on the one hand, reduce the output of hot water, hot steam, and on the other hand the exhaust temperature of waste gas, waste material or waste liquid can not effectively be inhibited, and long-term high temperature can influence the normal application of denitration module, leads to catalyst deactivation, and denitration effect weakens. Meanwhile, after long-term scale deposition, the blowing effect of the soot blower is gradually weak, the heat exchange tube body is easily corroded, a flue gas flow channel is easily blocked, the pressure drop of the flue gas is increased, the operation temperature of equipment is increased, the environment protection and energy consumption of the device are influenced, and even the safe operation of a recovery unit is influenced. Therefore, timely cleaning of the scale deposit of the economizer is very important, but in the prior art, the speed of using high-pressure water for washing is low, the washing is not thorough, and water easily enters the rotary air preheater during washing, so that the safety of electrical equipment of a unit can be influenced; chemical agents are also used to clean the economizer, but tend to corrode the equipment and the agents and waste materials can affect the environment if not properly disposed of.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides a dry ice cleaning method and a dry ice cleaning machine for a furnace tube, which solve the problems that the heat recovery efficiency is seriously influenced and even the unit operation safety is influenced by the accumulated scale of an economizer after a waste heat boiler is used for a long time, and solve the problems that the speed is low when high-pressure water is used for washing, the washing is not thorough, and the water is easy to enter a rotary air preheater during the washing and possibly influences the safety of the unit electrical equipment. The method solves the problems that the method for cleaning the economizer by using chemical reagents is easy to corrode equipment, and the environment is influenced if the reagents and waste materials are not properly treated.
(II) technical scheme
In order to achieve the purpose, the invention provides the following technical scheme:
a dry ice cleaning machine for boiler tube which characterized in that: the high-speed air feeder comprises a main box body, wherein a conical hopper is arranged in the main box body, a vibrator is arranged on the side face of the hopper, a stirring roller is arranged in the hopper, a hopper outlet is provided with a flow sensor, the hopper outlet is led to an air lock feeder in a feeding box, the outlet of the feeding box is inserted in the radial direction of a high-speed air pipeline, a T-shaped groove and a high-speed air nozzle are further arranged in the high-speed air pipeline, the outlet of the high-speed air pipeline is connected with one end of a hose, a spray gun is arranged at the other end of the hose, and a convergence and diversion nozzle is arranged at the head of the spray gun.
Preferably, the convergent-divergent nozzle is provided with a nozzle joint, a nozzle neck, a nozzle first diffusion part and a nozzle second diffusion part in sequence from the tail part to the head part.
A dry ice cleaning method for a furnace tube is characterized in that: in the dry ice cleaning of the waste heat boiler economizer, the dry ice cleaning machine for the waste heat boiler economizer is used as described in any one of the above.
Preferably, the dry ice cleaning method for the furnace tube comprises the following steps: putting dry ice in the dry ice thermal insulation box into a hopper, conveying compressed air to a high-speed air pipeline after the compressed air is sequentially processed by an air compressor and a dryer, aligning a convergent flow-dividing nozzle to the scaling part of the economizer, and operating a dry ice cleaning machine to start cleaning.
(III) advantageous effects
Compared with the prior art, the invention has the following beneficial effects:
the stirring roller in the hopper and the vibrator on the side can process dry ice blocks or particle groups into dry ice particles and smoothly guide the dry ice particles to fall into the T-shaped groove through the air lock feeder, the reverse flow of the dry ice particles can be reduced through air lock supply, continuous quantitative supply is realized, and the flow sensor can sense the particle consumption in the hopper. At the moment, compressed air enters the T-shaped groove through the high-speed air pipeline and the air nozzle, is mixed with dry ice particles, and sequentially enters the hose and the spray gun to clean the economizer.
The convergent-divergent nozzle ensures that the nozzle can achieve a large flow rate even with low pressure and small amount of air by the neck convergence and two nozzle divergent portions.
The dry ice cleaning method sprays dry ice to the surface of the economizer, and the dry ice is volatile low-temperature solid particles, so when the dry ice is sprayed to the surface of the economizer at a high speed, impact kinetic energy instantly gasifies the dry ice particles, a large amount of heat is absorbed, and violent heat exchange is generated on the surface of the economizer to force incrustation, quenching, shrinkage and embrittlement. Fouling and economizers often have different coefficients of expansion, and the temperature difference between the surface and the interior will break the bond between the two materials, and the instantaneous rapid shrinkage can tear the non-structural connection. Meanwhile, the volume of the dry ice is suddenly increased by 800 times in the gasification process of thousands of seconds, so that micro explosion is caused at an impact point, and the scale deposit is effectively knocked down. Therefore, the cleaning effect is thorough and better than that of the traditional high-pressure water cleaning, and the dry ice is volatilized into carbon dioxide and is also far cleaner than that of a chemical reagent cleaning. The accumulated scale on the surface of the economizer is cleaned by a dry ice cleaning method, and the waste heat recovery of the waste heat boiler is recovered to be normal.
Drawings
FIG. 1 is a schematic view of the dry ice cleaning machine of the present invention;
FIG. 2 is a schematic view of a convergent-divergent nozzle configuration of the present invention;
figure 3 is a schematic view of a dry ice cleaning method of the present invention.
In the figure: 1. a main box body; 2. a hopper; 3. a vibrator; 4. a stirring roller; 5. a flow sensor; 6. a feeding box; 7. an airlock feeder; 8. a high-speed air duct; 9. a T-shaped slot; 10. a high-speed air nozzle; 11. a hose; 12. a spray gun; 13. a convergent-divergent nozzle; 14. a nozzle adapter; 15. a nozzle neck; 16. a first diffusion portion; 17. a second diffusion portion; 18. a dry ice incubator; 19. an air compressor; 20. and (7) a dryer.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of this patent, it is noted that unless otherwise specifically stated or limited, the terms "mounted," "connected," and "disposed" are to be construed broadly and can include, for example, fixedly connected, disposed, detachably connected, disposed, or integrally connected and disposed. The specific meaning of the above terms in this patent may be understood by those of ordinary skill in the art as appropriate.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
Example 1
Referring to fig. 1, the present invention provides the following technical solutions:
a dry ice cleaning machine for boiler tube which characterized in that: including the main tank body 1, be equipped with conical hopper 2 in the main tank body 1, 2 sides of hopper are equipped with vibrator 3, be equipped with stirring roller 4 in the hopper 2, 2 exports of hopper are equipped with flow sensor 5, 2 exports of hopper lead to the air lock feeder 7 in the pay-off box 6, the export of pay-off box 6 is inserted in the footpath of a high-speed air pipe 8, still be equipped with T-slot 9 and high-speed air nozzle 10 in the high-speed air pipe 8, the exit linkage of high-speed air pipe 8 has one end of hose 11, spray gun 12 is installed to hose 11 another, convergence reposition of redundant personnel nozzle 13 is installed to spray gun 12 head.
Example 2
Referring to fig. 2, the present invention provides the following technical solutions:
the dry ice cleaning machine for the furnace tube as described in embodiment 1 is characterized in that: the convergent-divergent nozzle 13 is provided with a nozzle joint 14, a nozzle neck 15, a nozzle first diffuser 16 and a nozzle second diffuser 17 in this order from the tail to the head.
Example 3
Referring to fig. 3, the present invention provides the following technical solutions:
a dry ice cleaning method for a furnace tube is characterized in that: in the dry ice cleaning of the waste heat boiler economizer, the dry ice cleaning machine for the waste heat boiler economizer described in embodiment 1 or 2 is used.
Preferably, the dry ice cleaning method for the furnace tube comprises the following steps: putting dry ice in the dry ice incubator 18 into the hopper 2, conveying compressed air to the high-speed air pipeline 8 after being processed by the air compressor 19 and the dryer 20 in sequence, aligning the convergent-divergent nozzle 13 to the scaling part of the economizer, and operating the dry ice cleaning machine to start cleaning.
The problem of after exhaust-heat boiler used for a long time, economizer scaling seriously influences heat recovery efficiency and even influences unit operation safety is solved, the problem that the speed is slow using high-pressure water to wash, the washing is not thorough, water easily enters into rotary air preheater during washing, and unit electrical equipment safety is probably influenced is solved. The method solves the problems that the method for cleaning the economizer by using chemical reagents is easy to corrode equipment, and the environment is influenced if the reagents and waste materials are not properly treated.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (4)
1. A dry ice cleaning machine for boiler tube which characterized in that: including main tank body (1), be equipped with conical hopper (2) in main tank body (1), vibrator (3) are equipped with to hopper (2) side, be equipped with stirring roller (4) in hopper (2), hopper (2) export is equipped with flow sensor (5), hopper (2) export accesss to airlock feeder (7) in feeding box (6), the export of feeding box (6) is inserted in the footpath of a high-speed air pipe way (8), still be equipped with T-slot (9) and high-speed air nozzle (10) in high-speed air pipe way (8), the exit linkage of high-speed air pipe way (8) has one end of hose (11), spray gun (12) are installed to hose (11) another, convergence reposition of redundant personnel nozzle (13) are installed to spray gun (12) head.
2. A dry ice cleaning machine for furnace tubes as claimed in claim 1, wherein: the convergent-divergent nozzle (13) is sequentially provided with a nozzle joint (14), a nozzle neck (15), a nozzle first diffusion part (16) and a nozzle second diffusion part (17) from the tail part to the head part.
3. A dry ice cleaning method for a furnace tube is characterized in that: in dry ice cleaning of an economizer for waste heat boilers, use is made of the dry ice cleaning machine for an economizer for waste heat boilers according to any of claims 1 to 2.
4. A dry ice cleaning method for furnace tubes as claimed in claim 3, wherein: the method comprises the following steps: putting dry ice in a dry ice incubator (18) into a hopper (2), conveying compressed air to a high-speed air pipeline (8) after being sequentially processed by an air compressor (19) and a dryer (20), aligning a convergent-divergent nozzle (13) to a scaling part of an economizer, and operating a dry ice cleaning machine to start cleaning.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110929229.3A CN113483596A (en) | 2021-08-13 | 2021-08-13 | Dry ice cleaning method and dry ice cleaning machine for furnace tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110929229.3A CN113483596A (en) | 2021-08-13 | 2021-08-13 | Dry ice cleaning method and dry ice cleaning machine for furnace tube |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113483596A true CN113483596A (en) | 2021-10-08 |
Family
ID=77945229
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110929229.3A Pending CN113483596A (en) | 2021-08-13 | 2021-08-13 | Dry ice cleaning method and dry ice cleaning machine for furnace tube |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113483596A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024088722A1 (en) * | 2022-10-27 | 2024-05-02 | Clauger | Method for cleaning plates of a plate heat exchanger and device for implementing the method |
-
2021
- 2021-08-13 CN CN202110929229.3A patent/CN113483596A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024088722A1 (en) * | 2022-10-27 | 2024-05-02 | Clauger | Method for cleaning plates of a plate heat exchanger and device for implementing the method |
| FR3141518A1 (en) * | 2022-10-27 | 2024-05-03 | Clauger | METHOD FOR CLEANING PLATES OF A PLATE HEAT EXCHANGER AND DEVICE FOR IMPLEMENTING THIS METHOD |
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