CN101413656A - Vehicle mounted type steam-filling boiler with evaporation capacity as 18 ton / hour - Google Patents
Vehicle mounted type steam-filling boiler with evaporation capacity as 18 ton / hour Download PDFInfo
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- CN101413656A CN101413656A CNA2008101811643A CN200810181164A CN101413656A CN 101413656 A CN101413656 A CN 101413656A CN A2008101811643 A CNA2008101811643 A CN A2008101811643A CN 200810181164 A CN200810181164 A CN 200810181164A CN 101413656 A CN101413656 A CN 101413656A
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Abstract
A vehicular steam injection boiler has the evaporation capacity of 18 t/h; both a radiant section boiler and a convection section boiler are installed on a tow truck, wherein, the radiant section boiler is internally provided with a radiant section tube bank which is composed of a plurality of furnace tubes that are arranged along the annular direction of the inner wall of the radiant section boiler; the two adjacent furnace tubes are sequentially connected with each other head to tail by an elbow to form a snakelike tortuous single back stroke tube bank; the convection section boiler is internally provided with a convection section tube bank which is a single back stroke tube bank formed by connecting six lines of light tubes and a plurality of lines of finned tubes in a reciprocating way by using the elbow; a feed water preheater is installed outside the radiant section boiler, and the feed water preheater, the convection section tube bank and the radiant section tube bank are connected with each other by a pipeline; a furnace brick lining on the inner wall of the radiant section boiler is formed by compounding six layers of heat preservation materials; a transition section of the steam injection boiler is removed, the volume of the boiler is reduced, the heat loss is decreased, and machine weight is lightened, so that the vehicular steam injection boiler can bear the mechanical vibration in the transportation process, thus obviously increasing the rated evaporation which can reach 18 t/h.
Description
Technical field
The present invention relates to petroleum industry heating exploitation equipment, particularly injection boiler.
Background technology
Injection boiler is also referred to as steam generator, can be divided into fixed and vehicular two big classes, and vehicle mounted type steam-filling boiler is easy to use, can reduce the workload of oilfield surface construction, and reduces the thermal loss that pipeline is carried.Along with deepening continuously of China's thickened oil recovery, the oil field is more and more diversified to the demand of injection boiler, according to difference exploitation needs, on rated capacity, aspect such as pressure rating proposed diversified requirement.
The maximum rated evaporation capacity of vehicle mounted type steam-filling boiler is 11.2t/h at present, and far below the rated capacity of stationary type steam injecting boiler, its reason is:
One, existing vehicle mounted type steam-filling boiler, still adopt the structure of stationary type steam injecting boiler, body of heater is made up of radiant section, convection section, changeover portion three big sections, weight is big, thickness is big, be subjected to many-sided reasons such as trailer load-carrying quantitative limitation, it is very big that body of heater can't be done, and limited it and further improved rated capacity.
Two, existing vehicle mounted type steam-filling boiler, still adopt the heavy refractory material to do furnace lining, heavy refractory material weight is big, thickness is big, is subjected to trailer load-carrying quantitative limitation, and it is very big that furnace lining can't be done, heat insulation effect is poor, and when being vibrated in transportation, the heavy refractory material comes off easily, and these factors have all limited vehicle mounted type steam-filling boiler and further improved rated capacity.
Summary of the invention
For addressing the above problem, the purpose of this invention is to provide a kind of evaporation capacity and be 18 tons/hour vehicle mounted type steam-filling boiler, removed changeover portion, dwindled the volume of body of heater, furnace lining has adopted brand-new structure, has reduced thermal loss, alleviated weight of equipment, can bear the mechanical oscillation in the transportation, rated capacity significantly improves, and can reach 18t/h.
For achieving the above object, the present invention is by the following technical solutions:
A kind of evaporation capacity is 18 tons/hour a vehicle mounted type steam-filling boiler, comprise the radiant section body of heater, the convection section body of heater, feed water preheater, steam-water separator, high-pressure plunger pump, burner, it is characterized in that: the radiant section body of heater is a cylindrical shape, be welded by steel plate, be furnished with the radiant section tube bank in the radiant section body of heater, the radiant section tube bank is made of many boiler tubes, these boiler tubes are arranged along radiant section body of heater inwall hoop, two adjacent boiler tubes connect successively by the elbow head and the tail, constitute snakelike circuitous single backhaul tube bank, the convection section body of heater is the square chest shape, be welded by steel plate, be furnished with the convection section tube bank in the convection section body of heater, the convection section tube bank is the single backhaul tube bank that back and forth is formed by connecting by elbow by six row's light pipes and many row's finned tubes, light pipe is arranged in the porch of convection section body of heater, and finned tube is arranged in the top of light pipe, interlaced arrangement between two adjacent row's finned tubes; Burner is installed in the front portion of radiant section body of heater, feed water preheater is installed in the outside of radiant section body of heater, the shell side inlet of feed water preheater is communicated with feed pipe, high-pressure plunger pump is installed on the feed pipe, the shell side outlet of feed water preheater is communicated with the inlet of convection section tube bank by a pipeline, the outlet of convection section tube bank is communicated with the tube side inlet of feed water preheater by No. two pipelines, the tube side outlet of feed water preheater is communicated with the inlet of radiant section tube bank by No. three pipelines, the outlet of radiant section tube bank is communicated with the inlet of steam-water separator by No. four pipelines, and the outlet of steam-water separator is communicated with steam discharge pipe; It is characterized in that:
The convection section body of heater is directly installed on radiant section body of heater afterbody top, the inwall of radiant section body of heater has been laid with the furnace lining of insulation effect, furnace lining is composited by six layers of insulation material, ecto-entad is followed successively by ground floor, the second layer, the 3rd layer, the 4th layer, layer 5, layer 6, wherein first, second layer insulation material is the plain edition alumina silicate fibre blanket, the 3rd, the 4th layer of insulation material is the standard type alumina silicate fibre blanket, the 5th, the layer 6 insulation material is high-purity type alumina silicate fibre blanket, the thickness of above-mentioned each layer insulation material is 40mm, the inwall of ground floor insulation material and radiant section body of heater bonds together by high-temperature-resistant adhesive, the fissure of displacement is arranged between adjacent each layer insulation material, and bond together by high-temperature-resistant adhesive, the 4th, be provided with stainless steel lacing wire net between the layer 5 insulation material, the compartment of terrain, the outside of this stainless steel lacing wire net is provided with many stainless steel anchor rods, the inner of every stainless steel anchor rod has hook, it is online that hook is welded on the stainless steel lacing wire, the outer end of stainless steel anchor rod runs through the described the 4th, the 3rd, second, inwall with the radiant section body of heater behind the ground floor insulation material welds together, be provided with many stainless steel bolts the clear width of stainless steel lacing wire net, the outer end of every stainless steel bolt and stainless steel lacing wire net weld together, the inner of every stainless steel bolt runs through the described the 5th, fastening behind the layer 6 insulation material with ceramic caps, be laid with the far-infrared reflection dope layer at the inner surface of layer 6 insulation material.
The diameter of every boiler tube of described formation radiant section tube bank is 89mm, and the distance between the die of every boiler tube and the far-infrared reflection dope layer is between 50-60mm, and the distance between the die of two adjacent boiler tubes is 151.5mm.
The present invention has following positive beneficial effect:
The shell of radiant section body of heater is a cylindrical shape, is welded by steel plate, and the furnace lining of its inwall is made up of multilayer insulant, and body of heater outer surface mean temperature is less than 60 ℃ when normally moving.For the one side that makes radiant section tube bank back of the body fire also can be heated well, on the insulation material of furnace lining innermost layer, laid the far-infrared reflection dope layer, and boiler tube has been arranged on the position of best absorptive thermal radiation.Boiler tube is arranged along radiant section body of heater inwall annular, forms a cover steam circulation, is promoted by a plunger displacement pump.
Furnace lining adopts six layers of alumina silicate fibre composite construction, compares with traditional heat-insulating material, and it has following advantage.
Low unit weight: the alumina silicate fibre blanket furnace lining is lighter more than 75% than traditional insulating brick furnace lining, can alleviate the boiler steel structure load greatly, prolongs body of heater service life.In light weight, the thin thickness of entire fibre lining is easily realized furnace binding lightness, maximization, helps vehicle-mountedly, also helps improving rated capacity.
Low heat capacity: the thermal capacity of alumina silicate fibre blanket only is 1/9 of schamotte brick, and low heat capacity means that the heat of kiln absorption in back and forth operating is few, and what heat up simultaneously speeds up.Significantly reduced the energy consumption in the furnace temperature operation control, especially the heating furnace to the discontinuous operation can play obvious energy-saving effect.
Low heat conductivity: the alumina silicate fibre blanket thermal conductivity factor is little, is about 1/8 of schamotte brick, and insulation effect is remarkable.The structures of the staggered tiling of six layers of alumina silicate fibre blanket, the optimum value of every layer thickness is 40mm, can make the injection boiler hull-skin temperature be reduced to 55 ℃ ± 5 ℃, and the injection boiler hull-skin temperature that adopts other insulation construction at present is all more than 80 ℃.
Anti-mechanical shock: tapetum fibrosum or felt have flexibility and elasticity, and cracky not, make anchor rod with the stainless steel of high-temperature resistant anti-corrosive, are welded on the inboard wall of furnace body.Density can be adjusted as required, with the fixing innermost layer of the good ceramic cap of high-temperature-resistant and anti-corrosion, insulation effect, makes it to stablize, firmly and have the extremely strong anti-vibration resistance of jolting, and furnace lining integral body is hit when road transports or is subjected to vibrate and also can not damage.
Description of drawings
Fig. 1 is the structural representation of one embodiment of the invention.
Fig. 2 is the structural representation of radiant section body of heater among Fig. 1.
Fig. 3 is the A-A cutaway view of Fig. 2.
Fig. 4 is the B partial enlarged drawing of Fig. 3.
Fig. 5 is the structural representation of convection section body of heater among Fig. 1.
Fig. 6 is the side view of Fig. 5.
Fig. 7 is the steam pipeline flow chart of injection boiler shown in Figure 1.
The specific embodiment
Number in the figure
1 ground floor insulation material, 2 second layer insulation materials
The 4th layer of insulation material of 3 the 3rd layers of insulation material 4
5 layer 5 insulation materials, 6 layer 6 insulation materials
7 radiant section bodies of heater, 8 feed water preheaters, 9 convection section bodies of heater
10 trailers, 11 stainless steel lacing wire nets, 12 stainless steel anchor rods
13 hooks, 14 stainless steel bolts, 15 ceramic caps
The tube bank of 16 far-infrared reflection dope layers, 17 radiant sections
172 outlets of 171 inlets
18 high-pressure plunger pumps, 19 convection sections are restrained 20 burners
21 inlets, 22 outlets, 23 light pipes, 24 finned tubes
25 chimneys, 26 steam-water separators
27 furnace linings, 28 feed pipes, 29 elbows
32 No. two pipelines of No. 31 pipelines of 30 steam discharge pipes
34 No. four pipelines of 33 No. three pipelines
35 inlets, 36 outlets, 37 boiler tubes
Please refer to Fig. 1, Fig. 2, Fig. 3, Fig. 4, the present invention is that a kind of evaporation capacity is 18 tons/hour a vehicle mounted type steam-filling boiler, comprises radiant section body of heater 7, convection section body of heater 9, feed water preheater 8, steam-water separator 26, high-pressure plunger pump 18, burner 20.Radiant section body of heater 7 is a cylindrical shape, be welded by steel plate, be furnished with radiant section tube bank 17 in the radiant section body of heater 7, radiant section tube bank 17 is made of many boiler tubes 37, these boiler tubes 37 are arranged along radiant section body of heater 7 inwall hoops, adjacent two boiler tubes 37 connect successively by the elbow head and the tail, constitute snakelike circuitous single backhaul tube bank.
Please refer to Fig. 1, Fig. 5, Fig. 6, convection section body of heater 9 is the square chest shape, be welded by steel plate, be furnished with convection section tube bank 19 in the convection section body of heater 9, convection section tube bank 19 is the single backhaul tube banks that back and forth are formed by connecting by elbow 29 by six row's light pipes 23 and many row's finned tubes 24, light pipe 23 is arranged in the porch of convection section body of heater, and finned tube 24 is arranged in the top of light pipe 23, interlaced arrangement between two adjacent row's finned tubes 24.
Please refer to Fig. 7, burner 20 is installed in the front portion of radiant section body of heater 7, feed water preheater 8 is installed in the outside of radiant section body of heater 7, the shell side of feed water preheater 8 inlet 804 is communicated with feed pipe 28, high-pressure plunger pump 18 is installed on the feed pipe 28, the shell side outlet 801 of feed water preheater 8 is communicated with the inlet 21 of convection section tube bank 19 by a pipeline 31, the outlet 22 of convection section tube bank 19 is communicated with the tube side inlet 802 of feed water preheater 8 by No. two pipelines 32, the tube side outlet 803 of feed water preheater 8 is communicated with the inlet 171 of radiant section tube bank 17 by No. three pipelines 33, the outlet 172 of radiant section tube bank 17 is communicated with the inlet 35 of steam-water separator 26 by No. four pipelines 34, and the outlet 36 of steam-water separator 26 is communicated with steam discharge pipe 30.
Please refer to Fig. 4, radiant section body of heater inwall has been laid with the furnace lining 27 of insulation effect, furnace lining 27 is composited by six layers of insulation material, ecto-entad is followed successively by ground floor, the second layer, the 3rd layer, the 4th layer, layer 5, layer 6, wherein first, second layer insulation material 1,2 is the plain edition alumina silicate fibre blanket, the 3rd, the 4th layer of insulation material 3,4 is the standard type alumina silicate fibre blanket, the 5th, layer 6 insulation material 5,6 is high-purity type alumina silicate fibre blanket, the thickness of above-mentioned each layer insulation material is 40mm, this thickness had both helped insulation, can not make furnace lining overweight again, bond together by high-temperature-resistant adhesive between adjacent each layer insulation material, ground floor insulation material 1 bonds together by high-temperature-resistant adhesive with the inwall of radiant section body of heater, the prescription of high-temperature-resistant adhesive is a prior art, so this paper is no longer given unnecessary details.Between the 4th layer of insulation material 4 and layer 5 insulation material 5, be provided with stainless steel lacing wire net 11, the compartment of terrain, the outside of stainless steel lacing wire net 11 is provided with many stainless steel anchor rods 12, the inner of every stainless steel anchor rod 12 has hook 13, hook 13 is welded on the stainless steel lacing wire net 11, the outer end of stainless steel anchor rod 12 runs through the 4th, the 3rd, second, ground floor insulation material 4,3,2,1 back welds together with the inwall of radiant section body of heater 7, be provided with many stainless steel bolts 14 clear width of stainless steel lacing wire net 11, the outer end of every stainless steel bolt 14 and stainless steel lacing wire net 11 weld together, and the inner of every stainless steel bolt 14 runs through the 5th, layer 6 insulation material 5,6 backs are fastening with ceramic caps 15.
The above-mentioned this bonding fixed form that combines with anchoring, can bear the mechanical shock in the long-distance transport process, this fixed form also has another benefit: the outside of stainless steel lacing wire net is the huyashi-chuuka (cold chinese-style noodles) of furnace lining, the inboard of stainless steel lacing wire net is the hot side of furnace lining, the stainless steel anchor rod of huyashi-chuuka (cold chinese-style noodles) welding does not directly contact with the flue gas of hot side, prevent the heat bridge generation effectively, thereby obtained the excellent insulating effect; The stainless steel bolt of hot side does not directly contact with the furnace body outer wall steel plate, and fastening with ceramic caps, guarantees the fastness of furnace lining integral body.
Ground floor insulation material 1 is arranged with second layer insulation material 2 fissure of displacement; Fissure of displacement spacing is greater than 100mm.
Second layer insulation material 2 and the 3rd layer of insulation material 3 fissure of displacement are arranged; Fissure of displacement spacing is greater than 100mm.
The 3rd layer of insulation material 3 and the 4th layer of insulation material 4 fissure of displacement are arranged; Fissure of displacement spacing is greater than 100mm.
The 4th layer of insulation material 4 arranged with layer 5 insulation material 5 fissure of displacement; Fissure of displacement spacing is greater than 100mm.
Layer 5 insulation material 5 is arranged with layer 6 insulation material 6 fissure of displacement; Fissure of displacement spacing is greater than 100mm.
Adopt the fissure of displacement to arrange between the adjacent two-layer insulation material, avoided the appearance of straight-through seam, also overcome the straight-through seam that alumina silicate fibre blanket causes because of contraction, so structural integrity is good, radiation loss is little.Above structure Design has effectively been avoided occurring because of the deadweight of alumina silicate fibre blanket and the contraction under the high temperature make the anchoring piece position that anchoring piece that straight-through seam causes damages and heat is lost.
Furnace lining adopts the alumina silicate fibre blanket tiling structure of different temperature resistant grades, effectively utilizes the furnace lining rule that temperature reduces gradually on thickness direction, has reduced the cost of furnace lining.
Alumina silicate fibre blanket belongs to the insulation material of porous, and when being in malleation in the body of heater, the heat transfer type of furnace lining is except conduction heat transfer, and forced convertion also becomes main heat transfer type.High-temperature-resistant adhesive can avoid producing forced convertion, therefore can obtain better heat insulation effect.Alumina silicate fibre blanket has high-thermosensitive, is convenient to automation control.Control system is made up of PLC+ industrial computer+touch-screen, has increased secondary meter, and signal is introduced the computer system of operation room, and operating personnel just can observe the operation of control boiler in operating room.
Six layers of alumina silicate fibre blanket that insulation material all is a prior art forming furnace lining, be divided into Three Estate, the alumina silicate fibre blanket of this Three Estate has clear and definite national standard, and operative norm is GB/T16400-2003, and the component of the alumina silicate fibre blanket of this Three Estate can be represented with following table:
| Model | Al 2O 3 | Al 2O 3+SiO 2 | Na 2O+K 2O | Fe 2O 3 |
| Plain edition | ≥45 | ≥96 | ≤0.5 | ≤1.2 |
| Standard type | ≥47 | ≥98 | ≤0.4 | ≤0.3 |
| High-purity type | ≥53 | ≥99 | ≤0.4 | ≤0.3 |
The inner surface of layer 6 insulation material 6 is laid with far-infrared reflection dope layer 16, and it has two effects, and the one, furnace lining inner surface thermal radiation capability is increased greatly, thereby the temperature in the burner hearth is significantly improved.The 2nd, at high temperature give off the extremely strong far infrared wave of penetration power, the heat of far infrared wave just in time heats the one side of the back of the body fire of radiant section tube bank 17, the i.e. wall-cooling surface of boiler tube 37.The one side of waring oneself in front of a fire of radiant section tube bank 17 is by the flame heat of burner, and heat simultaneously at positive, the back side, makes boiler tube 37 integral body be heated evenly, and reduces heat time heating time, energy savings, the service life of prolongation boiler tube 37.
The size of the RADIATION ANGLE COEFFICIENT of far-infrared reflection dope layer 16 directly influences the area that boiler tube 37 is accepted radiation, it with the relative pipe of boiler tube 37 apart from the relative distance e/d of the tube pitch far-infrared reflection dope layer of s/d (the s-pipe is apart from the d-diameter) and boiler tube 37 relevant (e-boiler tube center is to the distance of far-infrared reflection dope layer), in order to utilize far-infrared thermal radiation to greatest extent, during enforcement, the diameter that constitutes the every boiler tube 37 of radiant section tube bank 17 is 89mm, distance between the die of every boiler tube 37 and the far-infrared reflection dope layer 16 is between 50-60mm, with 55mm is good, and the distance between two adjacent boiler tubes 37 is 151.5mm.Be s=151.5mm, d=89mm, e=55mm.After satisfying above-mentioned condition, boiler tube 37 one side of burner flame dorsad can obtain sufficient far-infrared thermal radiation, and heat simultaneously at front, the back side of boiler tube 37, make boiler tube 37 integral body be heated evenly, reduce heat time heating time, energy savings, the service life of prolongation boiler tube 37.
Claims (2)
1. an evaporation capacity is 18 tons/hour a vehicle mounted type steam-filling boiler, comprises radiant section body of heater, convection section body of heater, feed water preheater, steam-water separator, high-pressure plunger pump, burner, it is characterized in that:
The radiant section body of heater is a cylindrical shape, be welded by steel plate, be furnished with the radiant section tube bank in the radiant section body of heater, the radiant section tube bank is made of many boiler tubes, these boiler tubes are arranged along radiant section body of heater inwall hoop, two adjacent boiler tubes connect successively by the elbow head and the tail, constitute snakelike circuitous single backhaul tube bank, the convection section body of heater is the square chest shape, is welded by steel plate, is furnished with the convection section tube bank in the convection section body of heater, the convection section tube bank is the single backhaul tube bank that back and forth is formed by connecting by elbow by six row's light pipes and many row's finned tubes, light pipe is arranged in the porch of convection section body of heater, and finned tube is arranged in the top of light pipe, interlaced arrangement between two adjacent row's finned tubes; Burner is installed in the front portion of radiant section body of heater, feed water preheater is installed in the outside of radiant section body of heater, the shell side inlet of feed water preheater is communicated with feed pipe, high-pressure plunger pump is installed on the feed pipe, the shell side outlet of feed water preheater is communicated with the inlet of convection section tube bank by a pipeline, the outlet of convection section tube bank is communicated with the tube side inlet of feed water preheater by No. two pipelines, the tube side outlet of feed water preheater is communicated with the inlet of radiant section tube bank by No. three pipelines, the outlet of radiant section tube bank is communicated with the inlet of steam-water separator by No. four pipelines, and the outlet of steam-water separator is communicated with steam discharge pipe;
The convection section body of heater is directly installed on radiant section body of heater afterbody top, the inwall of radiant section body of heater has been laid with the furnace lining of insulation effect, furnace lining is composited by six layers of insulation material, ecto-entad is followed successively by ground floor, the second layer, the 3rd layer, the 4th layer, layer 5, layer 6, wherein first, second layer insulation material is the plain edition alumina silicate fibre blanket, the 3rd, the 4th layer of insulation material is the standard type alumina silicate fibre blanket, the 5th, the layer 6 insulation material is high-purity type alumina silicate fibre blanket, the thickness of above-mentioned each layer insulation material is 40mm, the inwall of ground floor insulation material and radiant section body of heater bonds together by high-temperature-resistant adhesive, the fissure of displacement is arranged between adjacent each layer insulation material, and bond together by high-temperature-resistant adhesive, the 4th, be provided with stainless steel lacing wire net between the layer 5 insulation material, the compartment of terrain, the outside of this stainless steel lacing wire net is provided with many stainless steel anchor rods, the inner of every stainless steel anchor rod has hook, it is online that hook is welded on the stainless steel lacing wire, the outer end of stainless steel anchor rod runs through the described the 4th, the 3rd, second, inwall with the radiant section body of heater behind the ground floor insulation material welds together, be provided with many stainless steel bolts the clear width of stainless steel lacing wire net, the outer end of every stainless steel bolt and stainless steel lacing wire net weld together, the inner of every stainless steel bolt runs through the described the 5th, fastening behind the layer 6 insulation material with ceramic caps, be laid with the far-infrared reflection dope layer at the inner surface of layer 6 insulation material.
2. evaporation capacity as claimed in claim 1 is 18 tons/hour a vehicle mounted type steam-filling boiler, it is characterized in that: the diameter of every boiler tube of described formation radiant section tube bank is 89mm, distance between the die of every boiler tube and the far-infrared reflection dope layer is between 50-60mm, and the distance between the die of two adjacent boiler tubes is 151.5mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008101811643A CN101413656A (en) | 2008-11-26 | 2008-11-26 | Vehicle mounted type steam-filling boiler with evaporation capacity as 18 ton / hour |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008101811643A CN101413656A (en) | 2008-11-26 | 2008-11-26 | Vehicle mounted type steam-filling boiler with evaporation capacity as 18 ton / hour |
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| CN101413656A true CN101413656A (en) | 2009-04-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNA2008101811643A Pending CN101413656A (en) | 2008-11-26 | 2008-11-26 | Vehicle mounted type steam-filling boiler with evaporation capacity as 18 ton / hour |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101929670A (en) * | 2010-09-29 | 2010-12-29 | 长沙锅炉厂有限责任公司 | Oilfield steam injection boiler |
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- 2008-11-26 CN CNA2008101811643A patent/CN101413656A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101929670A (en) * | 2010-09-29 | 2010-12-29 | 长沙锅炉厂有限责任公司 | Oilfield steam injection boiler |
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Open date: 20090422 |