CN1165739C - Dry ice cleaning method for convection chamber pipes of fuel oil heating furnace - Google Patents
Dry ice cleaning method for convection chamber pipes of fuel oil heating furnace Download PDFInfo
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- CN1165739C CN1165739C CNB021323143A CN02132314A CN1165739C CN 1165739 C CN1165739 C CN 1165739C CN B021323143 A CNB021323143 A CN B021323143A CN 02132314 A CN02132314 A CN 02132314A CN 1165739 C CN1165739 C CN 1165739C
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- dry ice
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Abstract
The present invention relates to a dry ice cleaning method, particularly to a dry ice cleaning method for furnace pipes of a convection chamber of a fuel oil heating furnace, which has the steps that manholes are arranged on a furnace wall at the side of a convection chamber; objects used for collecting dust are laid among layers; a dry ice cleaning system is connected, and dry ice loading amount and compressed air amount for cleaning dry ice are regulated based on the dirt conditions of a cleaning object; a dry ice spraying gun is used for jetting and cleaning the top surface and both sides of each furnace pipe from a first pipe row on the top of the furnace, and the dust is removed; in this way, the furnace pipes in the next pipe rows are jetted to be cleaned in turn, and the dust is removed. With a dry ice cleaning principle, the present invention can clean the furnace pipes of the convection chamber of a fuel oil heating furnace without damaging pipe walls or a furnace body or generating secondary waste materials and environment pollution. With the advantages of safe operation and obvious effect, the present invention solves a big problem for petrochemical industry.
Description
Technical field
The present invention relates to a kind of cleaning method that uses dry ice, especially fuel oil heating convection cell boiler tube dry ice cleaning method.
Background technology
The later stage eighties 20th century, Dry ice cleaning is applied, it with compressed air as power and carrier, with dry ice particles is the particle that is accelerated, by jet cleaning equipment, utilize the solid dry ice particles of high-speed motion momentum change, distil, dissolve homenergic conversion, make dirt, greasy dirt, residual impurity etc. freezing rapidly, thereby condense, embrittlement, be stripped from, reach the purpose of cleaning.JP61-15749A discloses and a kind of dry ice particle has been sprayed onto the technology of cleaning its attachment on the clean surface as cleaning agent.JP10-202208A discloses a kind of device that utilizes dry ice lumps to clean as medium.JP6-53199A discloses a kind of technology with the Dry ice cleaning surface.
The characteristics of tubular type fuel oil heating are direct flame heat, and its boiler tube will bear high temperature, high pressure and dielectric corrosion, and the medium in the pipe is inflammable, explosive, easy cracking, easy stronger oily gentle of coking and corrosivity.Tube furnace status in petrochemical plant is important, and it is main heat energy supply equipment, is again energy-conservation key equipment; It is the major part of capital expenditure, is again main pollution sources.The manufacturing trend maximization of tube furnace, the degree of depthization, integration, for example whole convection cell integral body is made in factory.Relevant simultaneously cry of preserving the ecological environment is more and more higher, and the smoke-discharging pollution problem of tube furnace is anxious to be solved.
Existing cleaning method has artificial mechanism method, water cutter ablution etc.Be difficult to fuel oil heating convection cell boiler tube is cleaned for the former; Can destroy insulating layer of furnace body again for the latter, producer does not generally select to clean for this reason.
Summary of the invention
The object of the present invention is to provide a kind of tube wall and body of heater of not damaging, do not produce secondary slugs and environmental pollution, the fuel oil heating convection cell boiler tube dry ice cleaning method of handling safety.
The step of fuel oil heating convection cell boiler tube dry ice cleaning method is:
1, offers manhole at heating furnace convection cell side furnace wall;
2, between each section of heating furnace convection cell layer, spread the object that is used to collect black dirt;
3, the air compressor airduct is docked with dry ice cleaning system, regulates load of dry ice cleaning and compressed air according to the soil conditions of cleaning object;
4, use the dry ice spray gun boiler tube end face and both sides to be carried out jet cleaning from first section pipe row of furnace roof, and deashing;
5, the rest may be inferred carries out jet cleaning to hypomere pipe grate furnace pipe, and deashing.
The heating furnace convection cell all adopts the multilayer boiler tube, leaves spacing in the middle of every layer of boiler tube, and its spacing can differ in size.Every layer boiler tube becomes one section layer of convection cell with spaced sets.
In order to realize described Dry ice cleaning, dry ice cleaning system can be selected dry ice pellet manufacturing system (comminutor) for use, is used for liquid carbon dioxide is made the dry-ice particle (selecting φ 3mm usually) of high density, dimensions unanimity; The compressed air feedway is used to the dry ice cleaner of plugging into, and promotes and the acceleration dry ice grain; Dry ice cleaner: the dry ice pellet that is used to pack into is mixed with compressed air, impacts the surface that is cleaned object by spray gun with compressed air.
Fuel oil heating is the visual plant of petrochemical industry, and the cleaning of fuel oil heating heating tube in section of convection chamber for a long time is an a great problem always.The investment of petrochemical industry heating furnace accounts for 30% of gross investment in China, and energy consumption accounts for 35% of total energy consumption, and improving thermal efficiency of heating furnace is to reduce enterprise energy consumption, the discharge capacity that reduces sulfur dioxide, the important channel of improving environmental quality.Heating furnace produces heat loss in running have 3 kinds: heat radiation, imperfect combustion and discharging flue gas, preceding 2 loss account for less than 2% of total amount of heat, and the heat loss that smoke evacuation causes is main loss.And heat loss due to exhaust gas is to tie grey thermal resistance by boiler tube to increase and cause, therefore the importance that boiler tube is cleaned is conspicuous.The present invention utilizes dry ice cleaning principle that fuel oil heating convection cell boiler tube is cleaned, and obtains significant effect, has solved a great problem of petrochemical industry.
Description of drawings
Fig. 1 is the photo before cleaning.
Fig. 2 is the design sketch after cleaning.
Fig. 3 is the photo before cleaning.
Fig. 4 is the design sketch after cleaning.
Fig. 5 is the photo before cleaning.
Fig. 6 is the design sketch after cleaning.
The specific embodiment
Below with reference to embodiment outstanding effect of the present invention is further described.
At fuel oil heating convection cell side revetment, leave a manhole near the next door of sound wave ash remover, length * roomy 70cm * 55cm or the 60cm * 40cm of being about, each stove is respectively opened a hole in levels.
Equally respectively open the manhole of a 50cm * 40cm in vacuum furnace convection section levels.Dry ice cleaning equipment is hung the operation furnace roof.The convection cell boiler tube is divided into three sections: spread fire-resistant tarpaulin and be used for the black dirt collection between each section layer.Enter first section pipe row from furnace roof, use the dry ice spray gun that boiler tube end face and both sides are cleaned.Enter manhole the ash that first section boiler tube falls down is gone out clearly, again second section stream chamber boiler tube carried out deashing.Finish by that analogy till the 3rd section boiler tube.With atmospheric pressure kiln and 152 boiler tubes of vacuum furnace is example, the about 1200m of engineering area
2, dress ice amount is 30Kg, consumption ice amount is 45～115Kg/h, compressed air 6～8.5bar, 4～5.5m
3/ min.Use 2 of dry ice cleaners.
The Dry ice cleaning ash disposal is carried out on convection cell boiler tube surface, and the scrubbing rate reaches more than 80%.By range estimation, boiler tube surface cleaning, remarkable benefit.
According to formula Q=V * C * (T2-T1), wherein Q is that every kilogram of fuel takes up the flue gas calorific value, V is every kilogram of fuel exhaust gas volumn, and general band amount is 25.39Nm
2/ Kg, C are that flue gas specific heat constant is 1.36, and T2 is an exhaust gas temperature, and T1 is environment temperature (being assumed to be 15 ℃), and exhaust gas temperature is descended 40～50 ℃.Can be regarded as out flue-gas temperature thus and descend that to take away the flue gas calorific value less be Q=25.39 * 1.36 * (45～15 ℃)=1035.91KJ/Kg, thermal efficiency formula Δ η=every kilogram takes up flue gas calorific value/fuel low heat valve * 100% less, the fuel low heat valve is 41900KJ/Kg, Δ η=1035.95/41900 * 100%=2.47%, with common 10,000,000 kilocalorie heating furnace oil consumption every day 150T/ platforms, year operation 300 days, crude oil price is calculated with 1000 yuan/T, but every every year energy efficient: 15T/ days * 300 * 2.47% * 1000=111,150.00 yuan.
Only the heating furnace that is had with two large group China Petrochemical Industry, PetroChina Company Limited. within Chinese territory is not less than 1500 calculating, and annual fuel-economizing benefit is not less than 1.6 hundred million yuan.
From Fig. 1～6 as seen, the present invention is the optimal selection that existing heating furnace cleans.
Claims (2)
1, fuel oil heating convection cell boiler tube dry ice cleaning method is characterized in that the steps include:
1), offers hand-hole at heating furnace convection cell side furnace wall;
2), between each section of heating furnace convection cell layer, spread the object that is used to collect black dirt;
3), the airduct of air compressor is docked with dry ice cleaning system, regulate load of dry ice cleaning and compressed air according to the soil conditions of cleaning object;
4), use the dry ice spray gun boiler tube end face and both sides to be carried out jet cleaning from first section pipe row of furnace roof, and deashing;
5), the rest may be inferred that hypomere pipe grate furnace pipe is carried out jet cleaning, and deashing.
2, fuel oil heating convection cell boiler tube dry ice cleaning method as claimed in claim 1, the object that it is characterized in that said collection black dirt is a fire-resistant tarpaulin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021323143A CN1165739C (en) | 2002-08-26 | 2002-08-26 | Dry ice cleaning method for convection chamber pipes of fuel oil heating furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021323143A CN1165739C (en) | 2002-08-26 | 2002-08-26 | Dry ice cleaning method for convection chamber pipes of fuel oil heating furnace |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1399118A CN1399118A (en) | 2003-02-26 |
| CN1165739C true CN1165739C (en) | 2004-09-08 |
Family
ID=4746739
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB021323143A Expired - Fee Related CN1165739C (en) | 2002-08-26 | 2002-08-26 | Dry ice cleaning method for convection chamber pipes of fuel oil heating furnace |
Country Status (1)
| Country | Link |
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| CN (1) | CN1165739C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101823065A (en) * | 2010-04-30 | 2010-09-08 | 苏州德华机械设备有限公司 | Device for descaling and derusting for pipeline and coating to form anti-corrosion coat and application method |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8099844B2 (en) * | 2007-03-26 | 2012-01-24 | Mars Metals, Inc. | Method and apparatus for removing material from a surface of a metal processing chamber |
| CN102519303A (en) * | 2011-12-26 | 2012-06-27 | 江铃汽车股份有限公司 | Washing method for improving fuel oil type drying room thermal efficiency |
-
2002
- 2002-08-26 CN CNB021323143A patent/CN1165739C/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101823065A (en) * | 2010-04-30 | 2010-09-08 | 苏州德华机械设备有限公司 | Device for descaling and derusting for pipeline and coating to form anti-corrosion coat and application method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1399118A (en) | 2003-02-26 |
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Granted publication date: 20040908 Termination date: 20130826 |