CN101797676A - Repair and surface protection process of desulfuration recycle pump - Google Patents
Repair and surface protection process of desulfuration recycle pump Download PDFInfo
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- CN101797676A CN101797676A CN201010013594A CN201010013594A CN101797676A CN 101797676 A CN101797676 A CN 101797676A CN 201010013594 A CN201010013594 A CN 201010013594A CN 201010013594 A CN201010013594 A CN 201010013594A CN 101797676 A CN101797676 A CN 101797676A
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Abstract
The invention relates to a repair and surface protection process of a desulfuration recycle pump. By adopting the manual profile-modeling surfacing to repair pump case lines of the desulfuration recycle pump and adopting the hypersonic flame spraying to prepare an erosion resistant coating, the invention realizes the on-site repair and large-area protection of the pump case molded lines of the desulfuration recycle pump, can repair and protect the desulfuration recycle pump at high quality, improves the cavitation erosion resistance, the corrosion resistance and the abrasion resistance of the device, prolongs the service life of the desulfuration recycle pump, and improves the operation safety of the power station desulfuration system. Besides, the prepared erosion resistant coating has the advantages of high bonding strength, low porosity, obviously-improved rigidity compared with the basal body, uniform and compact coating and excellent erosion resistance, and can greatly prolong the service life of the desulfuration recycle pump.
Description
Technical field
The invention belongs to the material technology field, relate to a kind of reparation and surface protection process of desulfuration recycle pump.
Background technology
Desulfuration recycle pump is the key equipment in lime stone (lime)/gypsum wet desulfurizer, is described as " heart of device operation ", and this pump is a kind of main equipment, costs an arm and a leg.Its effect is uninterruptedly to provide slurries to spray equipment, is implemented in the SO in the absorbing and removing flue gas in the absorption tower
2The circulating pump pumped (conveying) medium is gypsum solid formation and high-load Cl
-Etc. the corrosivity slurries, the operating condition inclement condition, pump case easily produces cavitation erosion, corrosion and wearing and tearing, thereby causing desulfuration recycle pump to damage lost efficacy, operation reliably and with long-term to pump brings very big influence, the safety and economic operation of the whole desulphurization system of serious threat, repairing these defectives effectively is to guarantee the important technique measure of desulphurization system safety and economic operation, seems very urgent and necessary.
Summary of the invention
The abrasion that the objective of the invention is to exist at thermal power plant desulfurization slurry circulating pump damages phenomenon, provide a kind of and can in time repair desulfuration recycle pump abrasion damage defect at the scene, the anti-abrasive coating of preparation desulfuration recycle pump, thereby improve the erosion of desulfuration recycle pump pump case gasproof, corrosion-resistant, abrasion resistance properties, prolong desulfuration recycle pump service life, strengthen the reparation and the surface protection process of the desulfuration recycle pump of power station desulphurization system operational efficiency and security.
For achieving the above object, the technical solution used in the present invention is:
1) repairs the preceding on-the-spot desulfuration recycle pump pump case material of identifying of direct reading spectroscopic instrument that adopts, pump case restoring area molded lines is tested,, make the molded lines model according to test data;
2) adopt macro-graph, magnetic powder inspection or penetrant inspection, check the distribution situation and the size of fretting corrosion defect;
3) cleaning fretting corrosion defect;
4) macro-graph and nondestructive inspection are rechecked, and affirmation area to be repaired defective is eliminated fully;
5) prepare V-butt in the area to be repaired, clean to V-butt and polishing on every side thereof, expose metallic luster, and use the acetone scrub;
Adopt the built-up welding of multilayer multiple tracks to repair when 6) welding, make welding bead (layer) even, thin narrow, and temperature between employing contact temperature-measuring instrument monitoring welding bead (layer);
7) adopt ultrasonic wave destressing equipment, eliminate weld residual stress, per pass built-up welding cladding weld seam need carry out naturally cooling to room temperature after 1～2 destressing is handled;
8) according to the molded lines model restoring area is carried out the reconditioning of pump case housing molded lines;
9) adopt the anti-abrasive coating of HVAF preparation, sprayed on material selects that to contain mass fraction be the WC-Co-Cr alloy powder that 10% Co, 4%Cr and 86% tungsten carbide constitute for use, powder size is 250～300 orders, spraying method selects for use supersonic velocity flame plating equipment to be equipped with supersonic spray gun, with HVAF technology the WC-Co-Cr powder is sprayed directly into desulfuration recycle pump pump case surface, coating layer thickness is 0.50～1.0mm;
10) adopt blast atomizer coating to be sealed processing at last at the polyurethane of coating outer surface spraying one deck 0.01～0.02mm or the macromolecule hole sealing agent of acrylic.
The angle of the V-butt in the step 5) of the present invention is relevant with built-up welding cladding thickness, and it is to be easy to welding operation that the angle of groove requires, and loading is few.
Step 6) of the present invention adopts the inverter type welder of manual electric arc welding or GTAW; Select wlding for use with the pump case homogeneity.
Step 8) pump case housing molded lines reconditioning of the present invention is adopted the manual machinery mode to polish and is repaiied type, comprises corase grind, fine grinding and three steps of correct grinding:
1) corase grind: adopt the angle grinding machine that surfacing part is roughly ground, the polishing welding seams reinforcement, reconditioning goes out roughly molded lines of pump case housing;
2) fine grinding: adopt the reconditioning instrument, frustrate fine grinding built-up welding zone, make the approaching and reset condition of pump case molded lines with rotation;
3) correct grinding: adopt the reconditioning instrument, with fine grinding wheel correct grinding built-up welding zone, and constantly the pump case type is measured, until recovering pump case housing molded lines fully.
Whether macro-graph circulating pump pump case surface exists defective before the anti-abrasive coating of HVAF of the present invention preparation, and cleans the pump case inwall, removes surperficial dirt, and with the high temperature masking tape to circulating pump not spraying area cover protection.
The detailed process of the anti-abrasive coating of step 10) HVAF preparation of the present invention is:
1) working pressure formula sand-blast, adopting granularity is 10～50 purpose corundum sands, and circulating pump pump case spraying area is carried out coarse, activation processing, makes pump case matrix surface roughness reach Ra2～15um, thoroughly remove oxide on surface, grease, dirt attachment, the even roughness activation;
2) use the oxy-acetylene neutral flame, surface to be sprayed is preheated to 100～300 ℃, adopt supersonic flame spraying method, at the pump case inner wall surface coating thickness after oil removing, rust cleaning, sandblast activation processing is the WC-Co-Cr coating of 0.50～1.0mm, and the HVAF technological parameter is: oxygen flow is 5～30m
3H
-1, the propane flow is 1000～3000Lh
-1, nitrogen flow is 1000～3000Lh
-1, the spray gun translational speed is 200～600mms
-1, spray distance is 100～400mm; Reply spraying position adopts infrared thermometer to carry out tracking and temperature testing in the spraying process, and observed temperature during the record spraying guarantees that spray pump housing base temperature in spraying process is 100～500 ℃; It is stable to keep spraying parameter in the spraying process, and controlling every is 0.02～0.06mm all over coating layer thickness.
The present invention adopts manual welding profiling built-up welding to repair desulfuration recycle pump pump case molded lines, the anti-abrasive coating of HVAF preparation, realize the protection of online molded lines reparation of on-the-spot desulfuration recycle pump pump case and large tracts of land, can make desulfuration recycle pump be repaired in high quality and protect, the gasproof erosion of raising equipment, burn into polishing machine, prolong desulfuration recycle pump service life, improve power station desulphurization system safety in operation, under the condition that current coal-fired cost improves, adopt this technology can be for reaching considerable energy saving consumption reduction purpose, for power plant brings remarkable economic efficiency.
The specific embodiment
Whole process of the present invention is as follows:
1) repairs the preceding on-the-spot desulfuration recycle pump pump case material of identifying of direct reading spectroscopic instrument that adopts, pump case restoring area molded lines is tested,, make the molded lines model according to test data;
2) adopt macro-graph, magnetic powder inspection or penetrant inspection, check the distribution situation and the size of fretting corrosion defect;
3) adopt the manual machinery mode to clear up fretting corrosion defect;
4) macro-graph and nondestructive inspection are rechecked, and affirmation area to be repaired defective is eliminated fully;
5) adopt mechanical system to prepare V-butt in the area to be repaired, bevel angle is relevant with built-up welding cladding thickness, and it is to be easy to welding operation that groove prepares principle, and loading is few.
6) reply groove and polishing on every side thereof are clean before the weldering, expose metallic luster, and clean with acetone.
Adopt the built-up welding of multilayer multiple tracks to repair when 7) welding, make welding bead (layer) even, thin narrow, and temperature between employing contact temperature-measuring instrument monitoring welding bead (layer);
Welding method: manual electric arc welding or GTAW;
Welding material:, select wlding for use with the pump case homogeneity according to desulfuration recycle pump pump case unlike material;
Welding equipment: inverter type welder;
Welding condition sees Table 1.
Table 1 welding condition
| Welding method | ??GTAW | ??SMAW |
| Wlding | Diameter: Φ 2.4mm | Diameter: Φ 3.2mm |
| Polarity | ??DC+ | ??DC- |
| Welding current (A) | ??90～100 | ??100～110 |
| Weldingvoltage (V) | ??10～12 | ??25～30 |
| Speed of welding (mm.min -1) | ??38～48 | ??70～80 |
| Weld preheating (℃) | ??/ | ??/ |
| Interlayer temperature (℃) | ??120～150 | ??120～150 |
| Purity of argon (%) | ??99.99 | ??/ |
| Front argon flow amount (L.min -1) | ??10 | ??/ |
| Back side argon flow amount (L.min -1) | ??10 | ??/ |
8) adopt ultrasonic wave destressing equipment, eliminate weld residual stress, per pass built-up welding cladding weld seam need carry out naturally cooling to room temperature after 1～2 destressing is handled;
9) according to the molded lines model restoring area is carried out the reconditioning of pump case housing molded lines, reconditioning is adopted the manual machinery mode to polish and is repaiied type, mainly comprises corase grind, fine grinding, three steps of correct grinding.
Corase grind: adopt the angle grinding machine that surfacing part is roughly ground, the polishing welding seams reinforcement, reconditioning goes out roughly molded lines of pump case housing;
Fine grinding: adopt the reconditioning instrument, frustrate fine grinding built-up welding zone, make the approaching and reset condition of pump case molded lines with rotation;
Correct grinding: adopt the reconditioning instrument, with fine grinding wheel correct grinding built-up welding zone, and constantly the pump case type is measured, until recovering pump case housing molded lines fully;
10) adopt the anti-abrasive coating of HVAF preparation, sprayed on material selects that to contain mass fraction be the WC-Co-Cr alloy powder that 10% Co, 4%Cr and 86% tungsten carbide constitute for use, powder size is 250～300 orders, spraying method selects for use supersonic velocity flame plating equipment to be equipped with supersonic spray gun, with HVAF technology the WC-Co-Cr powder is sprayed directly into desulfuration recycle pump pump case surface, coating layer thickness is 0.50～1.0mm;
The detailed process of spraying is:
Specifically may further comprise the steps:
Whether macro-graph circulating pump pump case surface exists defective before the spraying, and cleans the pump case inwall, removes surperficial dirt, and with the high temperature masking tape to circulating pump not spraying area cover protection;
Working pressure formula sand-blast, adopting granularity is 10～50 purpose high-quality corundum sands, and circulating pump pump case spraying area is carried out coarse, activation processing, makes the matrix surface roughness reach Ra2～15um, thoroughly remove attachments such as oxide on surface, grease, dirt, the even roughness activation;
Use the oxy-acetylene torch, surface to be sprayed is preheated to 100～300 ℃, adopt supersonic flame spraying method, at the pump case inner wall surface coating thickness after oil removing, rust cleaning, sandblast activation processing is the WC-Co-Cr coating of 0.50～1.0mm, and the HVAF technological parameter is: oxygen flow is 5～30m
3H
-1, the propane flow is 1000～3000Lh
-1, nitrogen flow is 1000～3000Lh
-1, the spray gun translational speed is 200～600mms
-1, spray distance is 100～400mm; Reply spraying position adopts infrared thermometer to carry out tracking and temperature testing in the spraying process, and observed temperature during the record spraying guarantees that spray pump housing base temperature in spraying process is 100～500 ℃; It is stable to keep spraying parameter in the spraying process, and controlling every is 0.02～0.06mm all over coating layer thickness.
11) adopt blast atomizer coating to be sealed processing at last at the polyurethane of coating outer surface spraying one deck 0.01～0.02mm or the macromolecule hole sealing agent of acrylic.
Coating quality detects:
1) coating is carried out visual examination, coating surface should be smooth, color and luster unanimity, defective such as do not allow peeling, bubbling, come off;
2) adopt coating thickness detector that coating layer thickness is detected, the coating minimum thickness that records should be less than coated designs thickness, and coating layer thickness is even;
3) at the scene under the environment, preparation HVAF lacing film sample, the coating lacing film sample chamber of experimentizing is detected, detected content and comprise: thermal shock test, mixcrohardness test, porosity test, bonding strength test, abrasive grain wear test, erosion resistance tests etc.The coating performance index is: coating layer thickness is 0.50～1.0mm, anchoring strength of coating 〉=70MPa, coating microhardness HV
0.3〉=1000, coating porosity≤1%, coating has good gasproof erosion, wear-resistant, decay resistance.
The invention provides " manual welding technology for repairing surfacing " and " HVAF prepares the erosion resistant coating technology " a kind of in combination flue gas desulfurization recycle pump reparation and surface protection process, this technology can make China's desulfuration recycle pump be repaired in high quality and protect, the gasproof erosion of raising equipment, corrosion, polishing machine, prolong the service life of desulphurization system critical component, repair with protection back desulfuration recycle pump molded lines and recover good, the anti-abrasive coating bond strength height of preparation, porosity is low, hardness improves significantly than matrix, the coating even compact, the wear-corrosion resistance excellence can delay the desulfuration recycle pump service life greatly.The technology of the present invention has that the scene is can be handling strong, resistance to abrasion improves obviously, the reliability advantages of higher, can on-the-spotly solve and improve China at the ubiquitous abrasion damage problem of labour power station desulfuration recycle pump, improve power station desulphurization system safety in operation and efficient, reach energy saving purposes, increase the economy of power plant benefit.
Claims (6)
1. the reparation of a desulfuration recycle pump and surface protection process is characterized in that:
1) repairs the preceding on-the-spot desulfuration recycle pump pump case material of identifying of direct reading spectroscopic instrument that adopts, pump case restoring area molded lines is tested,, make the molded lines model according to test data;
2) adopt macro-graph, magnetic powder inspection or penetrant inspection, check the distribution situation and the size of fretting corrosion defect;
3) cleaning fretting corrosion defect;
4) macro-graph and nondestructive inspection are rechecked, and affirmation area to be repaired defective is eliminated fully;
5) prepare V-butt in the area to be repaired, clean to V-butt and polishing on every side thereof, expose metallic luster, and use the acetone scrub;
6) adopt the built-up welding of multilayer multiple tracks to repair, make welding bead (layer) even, thin narrow, and adopt temperature between contact temperature-measuring instrument monitoring welding bead (layer);
7) naturally cool to and adopt ultrasonic wave destressing equipment after the room temperature, eliminate weld residual stress, per pass built-up welding cladding weld seam need carry out 1～2 destressing handle after;
8) according to the molded lines model welding restoring area is carried out the reconditioning of pump case housing molded lines;
9) adopt the anti-abrasive coating of HVAF preparation, sprayed on material selects that to contain mass fraction be the WC-Co-Cr alloy powder that 10% Co, 4%Cr and 86% tungsten carbide constitute for use, powder size is 250～300 orders, select supersonic velocity flame plating equipment for use, with HVAF technology the WC-Co-Cr powder is sprayed directly into desulfuration recycle pump pump case surface, coating layer thickness is 0.50～1.0mm;
10) adopt blast atomizer coating to be sealed processing at last at the polyurethane of coating outer surface spraying one deck 0.01～0.02mm or the macromolecule hole sealing agent of acrylic.
2. the reparation of desulfuration recycle pump according to claim 1 and surface protection process, it is characterized in that: the angle of the V-butt in the described step 5) is relevant with built-up welding cladding thickness, and it is to be easy to welding operation that the angle of groove requires, and loading is few.
3. the reparation of desulfuration recycle pump according to claim 1 and surface protection process is characterized in that: the inverter type welder of described step 6) employing manual electric arc welding or GTAW; Select wlding for use with the pump case homogeneity.
4. the reparation of desulfuration recycle pump according to claim 1 and surface protection process is characterized in that: described step 8) pump case housing molded lines reconditioning is adopted the manual machinery mode to polish and is repaiied type, comprises corase grind, fine grinding and three steps of correct grinding:
1) corase grind: adopt the angle grinding machine that surfacing part is roughly ground, the polishing welding seams reinforcement, reconditioning goes out roughly molded lines of pump case housing;
2) fine grinding: adopt the reconditioning instrument, frustrate fine grinding built-up welding zone, make the approaching and reset condition of pump case molded lines with rotation;
3) correct grinding: adopt the reconditioning instrument, with fine grinding wheel correct grinding built-up welding zone, and constantly the pump case type is measured, until recovering pump case housing molded lines fully.
5. the reparation of desulfuration recycle pump according to claim 1 and surface protection process; it is characterized in that: whether macro-graph circulating pump pump case surface exists defective before the anti-abrasive coating of described HVAF preparation; and cleaning pump case inwall; remove surperficial dirt, and with the high temperature masking tape to circulating pump not spraying area cover protection.
6. the reparation of desulfuration recycle pump according to claim 1 and surface protection process is characterized in that: the detailed process of the anti-abrasive coating of described step 10) HVAF preparation is:
1) working pressure formula sand-blast, adopting granularity is 10～50 purpose corundum sands, and circulating pump pump case spraying area is carried out coarse, activation processing, makes pump case matrix surface roughness reach Ra2～15um, thoroughly remove oxide on surface, grease, dirt attachment, the even roughness activation;
2) use the oxy-acetylene neutral flame, surface to be sprayed is preheated to 100～300 ℃, adopt supersonic flame spraying method, at the pump case inner wall surface coating thickness after oil removing, rust cleaning, sandblast activation processing is the WC-Co-Cr coating of 0.50～1.0mm, and the HVAF technological parameter is: oxygen flow is 5～30m
3H
-1, the propane flow is 1000～3000Lh
-1, nitrogen flow is 1000～3000Lh
-1, the spray gun translational speed is 200～600mms
-1, spray distance is 100～400mm; To the spraying position, adopt infrared thermometer to carry out tracking and temperature testing in the spraying process, observed temperature during the record spraying guarantees that spray pump housing base temperature in spraying process is 100～500 ℃; It is stable to keep spraying parameter in the spraying process, and controlling every is 0.02～0.06mm all over coating layer thickness.
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| CN2010100135941A CN101797676B (en) | 2010-01-13 | 2010-01-13 | Repair and surface protection process of desulfuration recycle pump |
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|---|---|---|---|
| CN2010100135941A CN101797676B (en) | 2010-01-13 | 2010-01-13 | Repair and surface protection process of desulfuration recycle pump |
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| CN101797676A true CN101797676A (en) | 2010-08-11 |
| CN101797676B CN101797676B (en) | 2012-07-25 |
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