CN113007737B - Waste heat boiler water wall tube bank recycling technology for garbage power station - Google Patents
Waste heat boiler water wall tube bank recycling technology for garbage power station Download PDFInfo
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- CN113007737B CN113007737B CN202110230790.2A CN202110230790A CN113007737B CN 113007737 B CN113007737 B CN 113007737B CN 202110230790 A CN202110230790 A CN 202110230790A CN 113007737 B CN113007737 B CN 113007737B
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- tube bank
- wall tube
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- heat boiler
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23M—CASINGS, LININGS, WALLS OR DOORS SPECIALLY ADAPTED FOR COMBUSTION CHAMBERS, e.g. FIREBRIDGES; DEVICES FOR DEFLECTING AIR, FLAMES OR COMBUSTION PRODUCTS IN COMBUSTION CHAMBERS; SAFETY ARRANGEMENTS SPECIALLY ADAPTED FOR COMBUSTION APPARATUS; DETAILS OF COMBUSTION CHAMBERS, NOT OTHERWISE PROVIDED FOR
- F23M5/00—Casings; Linings; Walls
- F23M5/08—Cooling thereof; Tube walls
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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
- F23J3/00—Removing solid residues from passages or chambers beyond the fire, e.g. from flues by soot blowers
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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
- Y02E20/12—Heat utilisation in combustion or incineration of waste
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- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Furnace Housings, Linings, Walls, And Ceilings (AREA)
Abstract
The invention discloses a process for recycling a waste heat boiler water wall tube bank for a garbage power station, which can replace a castable wall in a waste heat boiler, turn over a scrapped water wall tube bank for use, use the original back surface, namely an undamaged surface, as a heated surface, fill high-temperature resistant castable in a pipeline after surface treatment, and build up weld nickel-based alloy on the surface of a fin to form a recycled water wall tube bank structure.
Description
Technical Field
The invention belongs to the technical field of recycling of water-cooled walls of waste incineration waste heat boiler systems, and particularly relates to a waste heat boiler water-cooled wall tube row recycling process for a waste power station.
Background
In recent years, along with the implementation of national cyclic economy policy, the waste incineration power generation in China enters a rapid development track, and the scale of the waste incineration power generation machine, the power generation amount and the like are developed rapidly in a blowout manner, and currently, the waste incineration power generation machine is the first to live in the world. The water wall is the main heated part of the boiler, and is an airtight structure (as shown in fig. 1 and fig. 2) formed by welding tubes and fins, and is laid on an evaporation heated surface formed by the inner wall of a boiler furnace, which is also called as a water wall tube bank. The function of the water wall tube bank is to absorb the radiant heat of the high-temperature flue gas in the hearth, wherein more than 50% of the heat is absorbed by the water wall tube bank and is used for heating the temperature of water in the tube, and continuously generating steam to push the blades of the steam turbine to rotate for power generation; meanwhile, the temperature of the boiler wall is reduced, and the service life of the boiler is prolonged.
The failure of the water wall tube bank is mainly caused by the reasons that the heating surface is subjected to long-term high-temperature corrosion, soot abrasion, slag bonding, creep expansion, fatigue and the likeAfter surface corrosion pits, fly ash grinding marks and fatigue cracks are generated, the pipelines on the heating surface are thinned, and dangerous accidents such as pipe explosion, leakage and the like are finally generated. For this reason, the national standard stipulates that the scrapped wall thickness of the water wall is reduced by 30% as the scrapped threshold value. To use more generally
For example, the pipe can be considered to be scrapped when the thickness of the pipe of the heating surface is reduced from 5mm to 3.5 mm. But enterprises are in economic consideration and often delay to replace, and actually most of the heating surfaces of the tube banks are not scrapped until the tube thickness is 2-3 mm, and hundreds of thousands of square meters and thousands of tons of water-cooled wall tube banks are scrapped all over the country every year.
Although the heating surface of the water wall tube bank is corroded by high temperature and the soot, the surface damage is serious, but the working temperature of the back surface of the water wall tube bank is only 100-200 ℃, the water wall tube bank is not corroded by high temperature basically, when the water wall tube bank is scrapped, only one layer of 'floating rust' is formed on the surface of the back surface of the water wall tube bank, the thickness of a pipeline is complete, and most of the water wall tube bank is in a 'seven-in-new' state after rust removal. The water wall scrapping means that 50% of high-quality alloy materials on the back of the tube bank are thrown away without using the alloy materials, so that the great waste of precious resources is caused, and the secondary waste of manufacturing energy is caused by re-melting and smelting.
Traditional exhaust-heat boilers all set up the castable in boiler inside lining and other metallic structure high temperature department in order to protect boiler and pipeline. Wherein some castables are located waste heat boiler first flue middle and lower part and hug closely the water-cooled wall tube bank, on the one hand for make the heat in the furnace not distribute away and guarantee that rubbish burning is stable, on the other hand also for sheltering from the water-cooled wall and avoid receiving the direct toast of flame (> 1000 ℃) in the msw incineration process, in order to prolong the life of water-cooled wall tube bank. The casting material is a high-temperature resistant mixed inorganic material, is added with water and stirred, is constructed by adopting a casting method, can be prefabricated into a prefabricated part with a specified shape and size, and can also be cast in situ along pins (playing a role in improving the strength of the casting material) on the outer wall of the water wall. However, the castable is very brittle under long-term high-temperature baking, cracks and local collapse are generated after the castable is generally used for 1 to 2 years, the castable is locally filled in a large area and is replaced in most 3 to 4 years, and the maintenance cost is high.
Disclosure of Invention
The invention provides a recycling process of a waste heat boiler water wall tube bank for a garbage power station, which aims to solve the technical problems of resource waste caused by the integral scrapping of the existing water wall tube bank, short service life of casting materials, difficult maintenance and the like.
The technical scheme provided by the invention is as follows:
a waste heat boiler water wall tube bank recycling process for a garbage power station can replace a castable wall in a waste heat boiler, and comprises the following steps:
(1) Screening tube rows scrapped from a garbage power station, picking out tube rows with no explosion, macroscopic cracks, thermal deformation and other appearance damages on a heating surface as a recycling blank, and turning the recycling blank to be used, namely changing the original back surface into the heating surface and the original heating surface into the back surface;
(2) Performing deformation correction on the recycled blank, removing accumulated dust and coking on the heated surface, performing sand blasting cleaning treatment on the heated surface and the back surface of the recycled blank, and spraying a high-temperature-resistant heat-insulating radiation coating on the heated surface;
(3) Filling a pouring material into the pipeline which reutilizes the blank, after the pouring material is solidified, welding two ends of the pipeline by using round steel plates, and overlaying a nickel-based alloy on the surface of the fin on the heating surface;
(4) Correcting secondary deformation generated by the recycled blank in the machining process, detecting and removing unqualified products, and obtaining a recycled water wall tube bank structure;
(5) And hoisting and erecting the recycled water-cooled wall tube bank structure, and closely installing the recycled water-cooled wall tube bank structure side by side with the service water-cooled wall tube bank, and partially welding and fixing the recycled water-cooled wall tube bank structure and the service water-cooled wall tube bank by adopting a connecting plate.
Preferably, in step (1), the thickness of the tube wall in the tube row is above 2 mm.
Preferably, in the step (2), the ash and coke on the heating surface are removed by using a handheld grinding wheel.
Preferably, in the step (3), the nickel-based alloy is added with Ni, cr, co, C, fe, si, B and C, wherein the mass fraction of the chromium is 10-20%, and the mass fraction of the nickel is 50-65%.
Preferably, in the step (2), the main component of the high-temperature-resistant heat-insulating radiation-resistant coating is SiC ceramic powder.
Preferably, in the step (3), the castable comprises the following substances in percentage by mass: 55-60% of aluminum oxide, 7-10% of aluminate cement, 15-24% of bauxite fine powder, 3-5% of stainless steel powder, 1-3% of micron-sized silicon powder, 0.1-0.2% of water reducing agent and 3-5% of auxiliary agent.
More preferably, the stainless steel powder is prepared by using stainless steel containing 18-20% of chromium, 10-12% of nickel and about 3% of molybdenum as a raw material, atomizing, ball-milling in the presence of a lubricant, and sieving and grading.
Compared with the prior art, the invention has the following technical advantages:
(1) The recycled water wall tube bank structure is filled with pouring materials in the pipeline, and can play a role of supporting a framework in practical application; in the long-term high-temperature baking process of the hearth, the high-temperature oxide product sprayed with the alloy on the tube bank gradually infiltrates into the castable to form an integrated structure, so that the brittleness of the high-temperature castable can be greatly reduced, the crack propagation tendency is inhibited, the overall toughness of the tube bank structure of the water-cooled wall is improved, and the phenomenon of local collapse or fragmentation can not occur even if the castable is exposed after the tube wall is locally thinned or even locally burnt and lost after long-term use. The recycled water wall tube bank structure has obvious advantages in the aspects of maintenance and service life.
(2) From the aspect of economy, the purchase cost of the scrapped tube bank is about 4000 yuan/ton, and although the castable is also used in the recycling process, the consumption is about 10% -15% of that of the traditional castable; although the nickel-based alloy is overlaid on the surface of the fin, the width of the fin is only 70-100 mm, and the overlaid area is small. Compared with the cost of the traditional refractory belt casting material (the thickness is about 50 mm), the cost of the recycled water wall tube bank structure product is reduced by more than 15% compared with the traditional casting material; compared with the traditional castable wall (the thickness is about 150 mm), the cost is reduced by more than 30%. The invention not only provides a new way for recycling the scrapped water-cooled wall, but also reduces the production cost while ensuring the use effect.
(3) The high-temperature-resistant heat-insulating radiation-resistant coating used in the invention is a special functional energy-saving coating with high temperature resistance (the temperature can reach 1700 ℃), strong radiance (0.95), corrosion resistance and high wear resistance, and is sprayed on a heated surface, and the infrared radiation of the coating improves the heat exchange in a furnace, improves the temperature field intensity and uniformity in a hearth, enables the fuel to be more fully combusted, and can achieve the technical effects of increasing the thermal efficiency, reducing the energy consumption, protecting a water-cooled wall and prolonging the service life of the water-cooled wall.
(4) According to the invention, a certain amount of micron-sized metal silicon powder is added into the castable mainly comprising alumina, the alumina with larger particle size is used as aggregate, other raw materials with smaller particle size are used as powder and are filled into gaps of the aggregate, and aluminate cement is used as a bonding agent to tightly bond the raw materials, so that the strength of the castable is improved, the castable can be oxidized before easily-oxidized carbon materials are oxidized to form stable metal oxide and carbide, and the service performance of the castable is enhanced. In addition, the metal property is certain common property commonly possessed by metal, the nonmetal property is certain common property commonly possessed by nonmetal, and the metal silicon powder on the boundary of the metal and the nonmetal has certain common property of the metal and the nonmetal, so that the castable has good affinity with the inner wall of the metal pipeline. The addition amount of the metal silicon powder is 1-3%, and the high-temperature strength and the thermal expansion coefficient of the castable are influenced by the excessive addition amount of the metal silicon powder.
(5) According to the invention, a certain amount of micron-sized stainless steel powder is heated in the casting material mainly containing alumina, the stainless steel powder belongs to metal substances, and the steel pipe serving as the water cooler pipe row is also metal and has affinity between the metal substances and the metal substances, so that the bonding strength between the metal substances and the steel pipe is obviously higher than that between a common casting material and the inner wall of the steel pipe, and the effect of connecting the casting material and the pipe is achieved; the stainless steel powder is used as a reinforcing phase, has good toughness when being subjected to thermal shock, can improve the overall tensile strength and the flexural strength of the casting material, can inhibit cracking and bursting in the initial stage, and has good affinity with the inner wall of the water wall tube.
Drawings
FIG. 1 is a drawing of a water cooling wall tube array in the background of the invention
FIG. 2 is a photograph showing a part of a water-cooled wall pipe arrangement in the background of the invention
FIG. 3 is a schematic diagram of a tube bank structure of a reusable waterwall in an embodiment of the present invention
FIG. 4 is a schematic view showing the fusion of the metal material and the castable material of the tube wall under high-temperature baking (200 h)
FIG. 5 is a schematic view showing the fusion of the metal material and the castable material of the tube wall during high-temperature baking (300 h)
Wherein: 1. high-temperature-resistant heat-insulating radiation paint 2, casting material 3, surfacing nickel-based alloy 4, pipe outer diameter 5 and fins.
Detailed Description
The invention will now be further described with reference to specific embodiments and drawings.
The invention discloses a waste heat boiler water wall tube bank recycling process for a garbage power station, which can replace a castable wall in a waste heat boiler and comprises the following steps:
(1) Selecting the tube rows (accounting for about 60 percent of the total quantity of the discarded tube rows) which have relatively light appearance damages such as no cracking, macroscopic cracks, thermal deformation and the like on the heating surface and have the wall thickness of more than 2mm from the discarded tube rows purchased from the garbage power station as a recycled blank. And turning the recycled blank to use, namely changing the original back into the heated surface and changing the original heated surface into the back.
(2) The method comprises the steps of correcting the deformation of a recycled blank by adopting a special tool, removing accumulated dust and coking on a heating surface by using a handheld grinding wheel, performing sand blasting cleaning treatment on the heating surface and the back surface of the recycled blank, and spraying a high-temperature-resistant heat-insulating radiation coating on the heating surface, wherein the main component of the coating is SiC ceramic powder, so that the high-temperature absorption amount of a furnace cavity by a pipe wall can be greatly reduced.
(3) Filling a castable into a pipeline which reutilizes a blank, after the castable is solidified, welding two ends of the pipeline by using a round steel plate, and overlaying a nickel-based alloy on the surface of a fin on a heating surface, wherein the nickel-based alloy is added with Ni, cr, co, C, fe, si, B and C, the mass fraction of the chromium is 10-20%, and the mass fraction of the nickel is 50-65%; as shown in fig. 3.
(4) Correcting secondary deformation generated by the recycled blank in the machining process, detecting and removing unqualified products, and obtaining a recycled water wall tube bank structure;
(5) And hoisting the recycled water wall tube bank structure vertically, and installing the recycled water wall tube bank structure and the service water wall tube bank in parallel and tightly, wherein the part between the recycled water wall tube bank structure and the service water wall tube bank is welded and fixed by a connecting plate.
The castable comprises the following components in parts by mass: 55-60% of aluminum oxide, 7-10% of aluminate cement, 15-24% of bauxite fine powder, 3-5% of stainless steel powder, 1-3% of micron-sized silicon powder, 0.1-0.2% of water reducing agent and 3-5% of auxiliary agent. The stainless steel powder is prepared by using stainless steel containing 18-20% of chromium, 10-12% of nickel and about 3% of molybdenum as raw materials, and stainless steel powder is prepared by using stainless steel containing 18-20% of chromium, 10-12% of nickel and about 3% of molybdenum as raw materials, atomizing, ball-milling in the presence of a lubricant (stearic acid), sieving and grading. The stainless steel powder particles are regular round balls, the density is 7.9g/cm <3 >, and the average particle size is less than 33 mu m. Has good high-temperature corrosion resistance and durability.
The test shows that the volume density average value of the sintering material is 1.84g/cm <3 > and the breaking strength average value is 10.74MPa after sintering for 4 hours,
measurement of Performance
1. Measuring out-of-roundness, surface uniformity and the like of the recycled water wall tube bank structure according to a method disclosed in the power industry standard DL/T939-2005 to obtain the following results; (1) The surface of the tube bank has no defects of cracks, bruises, flattening, sand holes, layering and the like; (2) the surface of the tube bank is smooth and has no corrosion; (3) the negative tolerance of the wall thickness of the heating surface of the tube is less than 15% of the wall thickness; (4) The surface of the bent pipe is not strained, and the waviness is less than the factory requirement of a new pipe; (5) The actually measured wall thickness of the bent part of the bent pipe is larger than the theoretically calculated wall thickness of the straight pipe; (6) the out-of-roundness of the bent pipe is less than 6%, and the ball passing test is qualified; and (7) the surfacing edge of the fin has no undercut.
2. Putting the recycled water wall tube bank structure into an electric furnace at 1300 ℃, and performing high-temperature baking acceleration tests for 200 and 300 hours to obtain the surface appearance shown in the figures 4 and 5 after taking out; in the long-term high-temperature baking process of the hearth, the alloy material of the tube wall and the casting material are gradually fused into a whole, and the high-temperature oxide product of the alloy gradually infiltrates into the casting material to form an integrated structure, so that the plasticity of the casting material is enhanced, the brittleness of the high-temperature casting material is greatly reduced, and the crack propagation tendency is inhibited.
Claims (6)
1. A waste heat boiler water wall tube bank recycling process for a garbage power station can replace a castable wall in a waste heat boiler, and is characterized by comprising the following steps of:
(1) Screening tube banks scrapped from a garbage power station, picking out tube banks with no cracking, macrocracks, thermal deformation and other appearance damages on a heating surface as a recycling blank, and turning over the recycling blank for use, wherein the original back surface is changed into the heating surface, and the original heating surface is changed into the back surface;
(2) Performing deformation correction on the recycled blank, removing accumulated dust and coking on a heated surface, performing sand blasting cleaning treatment on the heated surface and the back of the recycled blank, and spraying a high-temperature-resistant heat-insulating radiation coating on the heated surface;
(3) Filling a castable into the pipeline of the recycled blank, after the castable is solidified, welding two ends of the pipeline by using round steel plates, and overlaying a nickel-based alloy on the surfaces of the fins on the heated surface;
(4) Correcting secondary deformation generated by the recycled blank in the machining process, detecting and removing unqualified products, and obtaining a recycled water wall tube bank structure;
(5) And hoisting and erecting the recycled water-cooled wall tube bank structure, and closely installing the recycled water-cooled wall tube bank structure side by side with the service water-cooled wall tube bank, and partially welding and fixing the recycled water-cooled wall tube bank structure and the service water-cooled wall tube bank by adopting a connecting plate.
2. The waste heat boiler water wall tube bank recycling process for the garbage power station as claimed in claim 1, characterized in that: in the step (1), the thickness of the pipe wall in the pipe row is more than 2 mm.
3. The waste heat boiler water wall tube bank recycling process for the garbage power station as claimed in claim 1, characterized in that: in the step (3), ni, cr, co, C, fe, si, B and C are added into the nickel-based alloy, wherein the mass fraction of the Cr is 10-20%, and the mass fraction of the Ni is 50-65%.
4. The waste heat boiler water wall tube bank recycling process for the garbage power station as claimed in claim 1, characterized in that: in the step (2), the main component of the high-temperature-resistant heat-insulating radiation-resistant coating is SiC ceramic powder.
5. The waste heat boiler water wall tube bank recycling process for the garbage power station as claimed in claim 1, characterized in that: in the step (3), the castable comprises the following substances in parts by mass: 55-60% of aluminum oxide, 7-10% of aluminate cement, 15-24% of bauxite fine powder, 3-5% of stainless steel powder, 1-3% of micron-sized silicon powder, 0.1-0.2% of water reducing agent and 3-5% of auxiliary agent.
6. The waste heat boiler water wall tube bank recycling process for the garbage power station as claimed in claim 5, characterized in that: the stainless steel powder is prepared by using stainless steel containing 18-20% of chromium, 10-12% of nickel and about 3% of molybdenum as raw materials, atomizing, ball-milling in the presence of a lubricant, sieving and grading.
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| CA1241882A (en) * | 1985-07-17 | 1988-09-13 | Foster Wheeler Energy Corporation | Erosion resistant waterwall |
| CN207556293U (en) * | 2017-12-08 | 2018-06-29 | 四川川锅科泰达能源技术有限公司 | A kind of packet wall water cooled wall type semi-coke heat recovery boiler |
| CN109023208A (en) * | 2018-08-20 | 2018-12-18 | 江西恒大工程技术有限公司 | Process for the ultra-thin nickel-base alloy erosion resistant coating of waste incinerator heating surface |
| CN109704732A (en) * | 2019-01-24 | 2019-05-03 | 北京利尔高温材料股份有限公司 | A kind of anti-high basicity slag tundish slag wall castable and preparation method thereof |
| CN111155088A (en) * | 2020-01-15 | 2020-05-15 | 江苏科环新材料有限公司 | Method for remanufacturing water-cooled wall of waste incineration power generation boiler |
-
2021
- 2021-03-02 CN CN202110230790.2A patent/CN113007737B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA1241882A (en) * | 1985-07-17 | 1988-09-13 | Foster Wheeler Energy Corporation | Erosion resistant waterwall |
| CN207556293U (en) * | 2017-12-08 | 2018-06-29 | 四川川锅科泰达能源技术有限公司 | A kind of packet wall water cooled wall type semi-coke heat recovery boiler |
| CN109023208A (en) * | 2018-08-20 | 2018-12-18 | 江西恒大工程技术有限公司 | Process for the ultra-thin nickel-base alloy erosion resistant coating of waste incinerator heating surface |
| CN109704732A (en) * | 2019-01-24 | 2019-05-03 | 北京利尔高温材料股份有限公司 | A kind of anti-high basicity slag tundish slag wall castable and preparation method thereof |
| CN111155088A (en) * | 2020-01-15 | 2020-05-15 | 江苏科环新材料有限公司 | Method for remanufacturing water-cooled wall of waste incineration power generation boiler |
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