CN203586173U - Waste heat boiler - Google Patents
Waste heat boiler Download PDFInfo
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- CN203586173U CN203586173U CN201320672268.0U CN201320672268U CN203586173U CN 203586173 U CN203586173 U CN 203586173U CN 201320672268 U CN201320672268 U CN 201320672268U CN 203586173 U CN203586173 U CN 203586173U
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- waste heat
- bobbin carriage
- heat boiler
- heat exchanger
- exchanger tube
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Abstract
The utility model relates to a waste heat boiler. The waste heat boiler comprises a housing (9), wherein an inlet pipe tank (92) and an outlet pipe tank (93) are respectively arranged at the front part and the rear part of the housing (9), and an intermediate pipe (7) is arranged between the inlet pipe tank (92) and the outlet pipe tank (93), so as to allow the gas from the inlet pipe tank (92) to flow into the outlet pipe tank (93) through the intermediate pipe (7); a heat exchange tube (2) is further arranged in the housing (9), and at least part of the heat exchange tube is mounted in the inlet pipe tank (92) and the outlet pipe tank (93) respectively through flexible pipe plates (5); the waste heat boiler further comprises a built-in by-pass device (3) arranged in the outlet pipe tank (93), wherein the built-in by-pass device (3) comprises a moveable pipe orifice used for sheltering the heat exchange tube (2) at the sheltered position and at least one baffle (31) used for opening the pipe orifice of the heat exchange tube at the open position, and further comprises a valve (6) used for controlling the on-off of the intermediate pipe (7); the on-off operation of the valve is correlated with the move of the baffle.
Description
Technical field
The utility model belongs to coal chemical technology, relates in particular to waste heat boiler.
Background technology
Waste heat boiler is the boiler that utilizes the waste heat producing steam in next life in industrial processes.It belongs to the heat exchanger of a kind of high temperature, high pressure.Waste heat boiler is early that the heat of recovery is limited for producing some low-pressure steams, can only be as the general complementary equipment of producing.Along with the development of production technology, the design parameter of waste heat boiler improves gradually, and waste heat boiler is changed into the power boiler of producing high steam by the process boilers of producing low-pressure steam.
The methanation process of the international Ke Shike Teng Mei of Inner Mongol Datang preparing natural gas Co., Ltd adopts high the methanation of carbon monoxide (HICOM) technique of Britain Dai Wei technology company (being DPT), its process characteristic is high temperature, Gao Qing, high carbon monoxide, and wherein hydrogen, carbon monoxide can cause metal dusting corrosion under certain condition.Under hot conditions, the Choice and design method of the bobbin carriage in waste heat boiler, tube sheet, tube sheet and heat exchanger tube welding material is had to very high requirement.Under the condition of Gao Qing, high carbon monoxide, the corrosion resistance of metal of waste heat boiler technique side is also had high requirements.
At present, the domestic waste heat boiler manufacturer of China lacks the relevant design experience under above-mentioned production environment under the technological requirement of high temperature, Gao Qing, high carbon monoxide.
Illustrate, for example, when synthesizing methane, gas by catalyst reaction after temperature sharply raise, and in course of reaction, CO content is very high.This has just proposed very high requirement to the resistant to elevated temperatures ability of waste heat boiler technique side.Current of home make fire tube waste heat boiler design temperature is on the low side, the technological requirement in the time of still can not meeting synthesizing methane.
In order to realize the object that realizes temperature adjusting under this process conditions by heat exchange, need a kind of resistant to elevated temperatures waste heat boiler that is provided with built in bypass device.
Utility model content
The purpose of this utility model be to provide the flowing through channel that can control process gas with control neatly with regulating stove in the resistant to elevated temperatures waste heat boiler of temperature.
For this reason, the utility model provides a kind of waste heat boiler, and it comprises the housing that is provided with a plurality of steam (vapor) outlets that are communicated with drum, and wherein the front and rear at this housing forms respectively entrance bobbin carriage and outlet bobbin carriage.In the middle of this entrance bobbin carriage and this outlet bobbin carriage, be provided with the intervalve that is communicated with both, to allow that the gas from this entrance bobbin carriage flows into this outlet bobbin carriage through this intervalve.In described housing, be also provided with at least one heat exchanger tube, at least a portion of this heat exchanger tube is arranged on respectively in described entrance bobbin carriage and described outlet bobbin carriage by flexible tubesheet.This waste heat boiler is also included near the built in bypass device being arranged in this outlet bobbin carriage the mouth of pipe of this intervalve and the mouth of pipe of this heat exchanger tube, this built in bypass device comprises movably to blocking at least one baffle plate of the mouth of pipe that blocks described heat exchanger tube in position and the mouth of pipe of opening described heat exchanger tube at open position and comprising that the make-break operation of wherein said valve is associated with the movement of described baffle plate for controlling the valve of described intervalve break-make.
According to waste heat boiler of the present utility model, be provided with built in bypass device, thereby can control the flowing through channel of process gas, to control neatly and to regulate in waste heat boiler the especially temperature of its side outlet.
Preferably, this valve is butterfly valve, plate valve or ball valve.
Preferably, tube sheet is flexible tubesheet.Adopt flexible tubesheet, can make such as heat exchanger tube etc., all the time in stretching state, to eliminate heat expansion stress.
More preferably, tube sheet has and can reduce the circular-arc edge that stress is concentrated.
Preferably, the mouth of pipe of the mouth of pipe of the heat exchanger tube in entrance bobbin carriage and the heat exchanger tube in outlet bobbin carriage is provided with protective casing.
Utilization arranges the protective casing of special substance in the heat exchanger tube end of waste heat boiler can avoid metal dusting corrosion.
More preferably, protective casing is that earthenware or the alloy material that corroded by resistance to metal dusting are made.
Preferably, the inwall top casting at entrance bobbin carriage has Monofrax.
Preferably, the inwall top casting at outlet bobbin carriage has the fire-resistant aluminum of high density.
Preferably, Monofrax is high density aluminum oxide, and is double-decker.Highly dense alumina material can guarantee good effect of heat insulation.
Accompanying drawing explanation
Fig. 1 is the integrally-built partial schematic sectional view according to waste heat boiler of the present utility model;
Fig. 2 is the partial enlarged drawing within the scope of M in Fig. 1;
Fig. 3 a is according to the sectional view at baffle position place in the built in bypass device of an embodiment of the present utility model;
Fig. 3 b is that the A-A of Fig. 3 a is to sectional view; And
Fig. 4 is according to the baffle plate in the built in bypass device in an embodiment of the present utility model and the schematic diagram of valve interaction relation.
The specific embodiment
Below, in conjunction with Fig. 1-2, specifically describe according to the structure of the waste heat boiler of the present embodiment.
Be noted that the term of any expression relative direction in literary composition, such as " front " and " afterwards ", " on " and D score etc., be only used to clearly describe and the needs of expressing, can't produce any restriction to the utility model.
Referring to Fig. 1, it is the integrally-built partial schematic sectional view according to the waste heat boiler of the present embodiment, wherein, with Reference numeral 100, represents waste heat boiler.Not shown part, is and part identical or similar part in position or structure is shown, can not affect those skilled in the art for understanding of the present utility model.
According to the waste heat boiler 100 of the present embodiment, comprise the housing 9 that is provided with a plurality of steam (vapor) outlets 105 that are communicated with bubble (not shown).Front and rear at housing 9 forms respectively entrance bobbin carriage 92 and outlet bobbin carriage 93, in the middle of entrance bobbin carriage 92 and outlet bobbin carriage 93, is provided with the intervalve 7 that is communicated with both, to allow that the gas from entrance bobbin carriage 92 flows into outlet bobbin carriage 93 through intervalve 7.Intervalve 7 be positioned at housing 9 interlude inside and run through this interlude, housing 9 corresponding to being also provided with boiler water import 104 on the outer wall of interlude, the outer wall corresponding to entrance bobbin carriage 92 of housing 9 is provided with the first floss hole 923, the outer wall corresponding to outlet bobbin carriage 93 of housing 9 is provided with the second floss hole 932 and drain 933, in the end that exports one end away from entrance bobbin carriage 92 of bobbin carriage 93, is provided with hand-hole 931.In housing 9, be also provided with at least one heat exchanger tube 2, at least a portion pipeline section of this heat exchanger tube is arranged on respectively in entrance bobbin carriage 92 and outlet bobbin carriage 93 by flexible tubesheet 5, at the internal interval of interlude, is provided with a plurality of dividing plates 106 perpendicular to intervalve 7.Waste heat boiler 100 is also included in outlet and is arranged near the built in bypass device 3 mouth of pipe of intervalve 7 and the mouth of pipe of heat exchanger tube 2 in bobbin carriage 93, this built in bypass device 3 comprises movably to blocking at least one baffle plate 31 of the mouth of pipe that blocks heat exchanger tube 2 in position and the mouth of pipe of opening heat exchanger tube 2 at open position and comprising that wherein the make-break operation of valve 6 is associated with the movement of baffle plate 31 for controlling the valve 6 of intervalve 7 break-makes.As shown in Fig. 3 a-4, in a specific embodiment, valve 6 is mobile associated each other by such structure with baffle plate 31, and valve 6 and two baffle plates 31 are contained on a valve rod 101 jointly, and the plane of the plane of valve 6 and two baffle plates 31 is orthogonal.Like this, when valve rod 101 rotates, valve 6 and two baffle plates 31 rotate simultaneously.When valve 6 turns to perpendicular to horizontal plane, baffle plate 31 has just turned to and has been parallel to horizontal plane, and in this case, the medium of intervalve 7 cannot circulate, and the medium of heat exchanger tube 2 can circulate; When valve 6 turns to while being parallel to horizontal plane, baffle plate 31 has just turned to perpendicular to horizontal plane, and in this case, the medium of intervalve 7 can circulate, and the medium of heat exchanger tube 2 cannot circulate.The rotation of valve rod 101 can realize by pneumatic adjusting.
Fig. 1 does not illustrate bubble, and this bubble is the mechanism being connected with waste heat boiler well known in the prior art.In addition, the part of conventional waste heat boiler or mechanism, device etc., although do not address in this article, they still can form the part according to waste heat boiler of the present utility model.This is readily appreciated that for those of ordinary skills and accepts.
Below, to relating to the part of the improvement of the utility model waste heat boiler 100, be described in detail.
About built in bypass device 3, as shown in Fig. 3 a-4, it should have such structure: comprise movably to blocking the baffle plate 31 of the mouth of pipe that blocks heat exchanger tube 2 in position and the mouth of pipe of opening heat exchanger tube 2 at open position and comprising for controlling the valve 6 of intervalve 2 break-makes, wherein, the make-break operation of valve 6 is associated with the movement of baffle plate 31.
Preferably, valve 6 is butterfly valves.In addition, can also use such as ball valve, plate valve etc. as valve 6.In this structure, whole built in bypass device 3 is equivalent to a large special butterfly valve.Two baffle plates 31 and valve 6 are all equivalent to the flap of butterfly valve.When baffle plate 31 is closed, valve 6 is just in open mode, and medium passes through from valve 6.When baffle plate 31 is opened, valve 6 is just in closed condition, and medium passes through from baffle plate 31.Preferably, the side towards outlet bobbin carriage 93 at this valve 6 is covered with erosion control baffle plate 107.
Preferred a kind of course of work of built in bypass device 3 can be roughly: when butterfly valve 6 is opened, baffle plate 31 can shelter from the mouth of pipe that is positioned at the heat exchanger tube 2 of outlet bobbin carriage 93, be herein heat exchanger tube 2 the mouth of pipe block position.Now, the most process gas that enter waste heat boiler 100 from process gas entrance point 21 will flow through from intervalve 7, then flow out the port of export of intervalve 7.In process gas described in this process, substantially do not carry out heat exchange.As shown in Fig. 3 a-4, when butterfly valve 3 cuts out, baffle plate 31 can rotate an angle, for example 90 °, and no longer block the mouth of pipe of heat exchanger tube 2 that is positioned at outlet bobbin carriage 93, thereby most process gas are only flow through substantially from heat exchanger tube 2, thereby make the heat exchange amount of described process gas reach maximum.
Valve 6 (being preferably butterfly valve) and the baffle plate 31 of above-mentioned composition built in bypass device 3, for example, can link, also can be by carry out respectively controlling valve 6 and baffle plate 31 such as control appliance (not shown).Herein, any by-pass valve control 6 that those of ordinary skills can expect and the mode of baffle plate 31 are all applicable.
It will also be appreciated that, baffle plate 31 and valve 6 can be opened an angle separately, rather than open or close the circulation of controlling described process gas completely.Particularly, for example, by-pass valve control 6 is opened approximately 30 °, and now, baffle plate 31 can only partly block the mouth of pipe of the heat exchanger tube 2 that is positioned at outlet bobbin carriage 93.In this case, described process gas can part be passed through in intervalve 7, and another part can be passed through by heat exchanger tube 2 simultaneously.Similarly, valve 6, baffle plate 31 can also have other different opening angle, realize thus the various control programs that flow for process gas, thereby obtain the different-effect under various applying working conditions.
According to the waste heat boiler 100 of the present embodiment, owing to being provided with built in bypass device 3, therefore can control the flowing through channel of described process gas, and then control neatly and regulate the temperature in waste heat boiler 100.
About tube sheet, it is one of important pressure-containing member of waste heat boiler.Because tube sheet both sides pressure reduction, the temperature difference are all very large, working condition is very harsh, is therefore also the structure of as easy as rolling off a log damage in the waste heat boiler course of work.The reliability of tube sheet design is directly connected to security, the economy of waste heat boiler.In the past, generally all adopt conventional design method when fire tube waste heat boiler tube sheet designs, computational process is loaded down with trivial details, and the tube plate thickness calculating is generally all partially thick.The tube plate thickness calculating under higher differential pressure condition can be very large.The increase of tube plate thickness, brings very big inconvenience can to manufacture, check etc. on the one hand, also can cause on the other hand the thermal (temperature difference) stress of tube sheet and thermal stress to increase.This makes waste heat boiler in use, owing to making tube sheet easily produce plastic deformation under the interior pressure compared with high and thermal (temperature difference) stress, the common period effects of thermal stress, bringing out fatigue crack etc.Visible, the connecting portion of tube sheet and waste heat boiler housing is the key of waste heat boiler Intensity Design.Therefore, the present embodiment preferably adopts flexible tubesheet 5 to replace conventional common tube plate, as depicted in figs. 1 and 2.And tube sheet has been carried out to stress analysis, show that adopted flexible tubesheet structure meets designing requirement.In actual production, the thin and thick of flexible tubesheet 5 is to design according to the size of useless pot.Preferably, flexible tubesheet 5 is thin flexible tubesheets.In a specific embodiment, flexible tubesheet thickness is 24mm, and the stationary pipes thickness of slab of the common heat exchanger that size is similar is up to 300mm left and right.Therefore, adopt the flexible tubesheet 5 in the present embodiment to improve widely its processing performance, reduced thermal (temperature difference) stress and thermal stress, facilitated manufacture, check etc.
Preferably, as shown in Figure 2, flexible tubesheet 5 has can reduce the circular-arc edge that stress is concentrated.
Known, the damage of most waste heat boilers is all the junction that occurs in heat exchanger tube and tube sheet, so the selection of heat exchanger tube and tube sheet connected mode is very crucial.Especially the waste heat boiler for high temperature, high pressure does not generally adopt single expanded joint or Welding Structure, but adopts the structure of swollen, weldering use.Although because expanded joint method can be born high pressure, when temperature reaches 300～400 ℃, creep causes the lax of residual stress, and swollen mouth was lost efficacy very soon.So if only adopt intensity welding, although can bear the temperature of elevated pressures and Geng Gao, under hot conditions, the effect of pulsating stress very easily causes welding point to produce fatigue crack, and crevice corrosion can accelerate the destruction of welding point.Therefore, according to having adopted the flexible tubesheet 5 of the waste heat boiler 100 of the present embodiment and being connected of heat exchanger tube 2 intensity weldering to stick on swollen mode.
As shown in Figure 2, the waste heat boiler 100 of the present embodiment adopts the end of the heat exchanger tube 2 near process gas entrance point 21 is arranged to protective casing 8.Preferably, the material selection earthenware of protective casing 8.In addition, protective casing 8 can also solve the problem of metal dusting corrosion.More particularly, near process gas entrance point 21 1 sides, the connecting portion of tube sheet 5 and heat exchanger tube 2, owing to there will be stress to concentrate, adds the impact of welding residual stress etc. and is subject to high-temperature technology gas erosion effect, and this connecting portion is more fragile.Therefore, can, at the protective casing 8 of the sheathed corundum material of heat exchanger tube 2 entrance points (near process gas entrance point 21 one end) or earthenware described above etc., this connecting portion be protected.Because the material heat resisting temperatures such as corundum, pottery are high, heat-proof quality good, can reduce the pore of tube sheet 5 and the temperature of inner hole welding of rapid cooling joint, play good heat-resisting protective action.More preferably, protective casing 8 adopts the alloy material (as SB516UNSN06025) of resistance to metal dusting corrosion to make, to improve the impact resistance of protective casing 8.Preferably, between protective casing 8 and heat exchanger tube 2, be arranged with the fine paper 102 of pottery.
Can expect, the length of protective casing 8 is unsuitable long, and its elongation surpasses the welding point region of tube sheet 5 and heat exchanger tube 2.If the length of protective casing 8 is long; the temperature of the protective casing 8 of the front end in refractory layer (i.e. a side of close process gas entrance point 21) is high more a lot of than the temperature of the protective casing 8 of the end of insertion heat exchanger tube 2 (i.e. a relative side away from process gas entrance point 21); therefore under the impact of thermal shock; protective casing 8 is easy to cracked, thereby loses heat-resisting protective action.
Therefore in addition, because the process gas entering in waste heat boiler 100 tube sides contains SO2 and a small amount of gases such as SO3, there is highly corrosive, can exchange heat pipe 2 and central tube 7 adopts hot dipping alumetizing process to carry out aluminising processing.Aluminising be anticorrosive life-span of improving metal material under various hot environments a kind of effectively and economic method, aluminium and oxygen have very strong affinity, very easily form fine and close Al2O3 film, the fusing point of this layer film is very high, can greatly improve high-temperature oxidation resistance and the corrosion resistance of heat exchanger tube 2 and central tube 7, can solve well the etching problem of the gases such as high-temperature oxydation and SO2, extension device service life, reduce costs.
It will also be appreciated that, on the inwall of entrance bobbin carriage 92, do not hinder process gas from process gas entrance point 21 enter and then flow into intervalve 7 entrance point 72 and from the port of export of intervalve 7 flow out be cast with Monofrax 103 and/or on the inwall of outlet bobbin carriage 93, do not hinder process gas to flow out and then flow out and be cast with the fire-resistant aluminum of high density from the process gas port of export 22 from the port of export of intervalve 7.
Preferably, described Monofrax 103 is high density aluminum oxide, and is double-decker.Wherein, every one deck has effect separately: the inside one deck is wearing layer, and effect is washing away of gasproof body.Outside one deck is thermal insulation layer, and its effect of heat insulation is best.The present embodiment is by adopting highly dense alumina material to guarantee good effect of heat insulation, thereby improved the resistance to elevated temperatures of waste heat boiler 100 integral body.
Although the utility model is to disclose under the background of specific embodiment, feature, scheme, it will be understood by those skilled in the art that the utility model to surmount the embodiment of concrete announcement and comprise alternate embodiment of the present utility model and/or purposes and various modification case of the present utility model and equivalent case.Therefore, should be understood that the various features of disclosed embodiment and scheme can combinations with one another or substitute, to realize the purpose of this utility model.Therefore, protection domain of the present utility model disclosed herein should not limited by above-mentioned specific embodiment or specific features.
Claims (9)
1. a waste heat boiler, comprise the housing (9) that is provided with a plurality of steam (vapor) outlets (105) that are communicated with bubble, wherein the front and rear at this housing (9) forms respectively entrance bobbin carriage (92) and outlet bobbin carriage (93), in the middle of this entrance bobbin carriage (92) and this outlet bobbin carriage (93), be provided with the intervalve (7) that is communicated with both, to allow that the gas from this entrance bobbin carriage (92) flows into this outlet bobbin carriage (93) through this intervalve (7);
It is characterized in that, be also provided with at least one heat exchanger tube (2) in described housing (9), at least a portion of this heat exchanger tube is arranged on respectively in described entrance bobbin carriage (92) and described outlet bobbin carriage (93) by flexible tubesheet (5); This waste heat boiler is also included near the built in bypass device (3) being arranged in this outlet bobbin carriage (93) mouth of pipe of this intervalve (7) and the mouth of pipe of this heat exchanger tube, this built in bypass device comprises movably to blocking at least one baffle plate (31) of the mouth of pipe that blocks described heat exchanger tube (2) in position and the mouth of pipe of opening described heat exchanger tube at open position and comprising that the make-break operation of wherein said valve is associated with the movement of described baffle plate for controlling the valve (6) of described intervalve (7) break-make.
2. waste heat boiler according to claim 1, is characterized in that, described valve (6) is butterfly valve, plate valve or ball valve.
3. waste heat boiler according to claim 1 and 2, is characterized in that, described tube sheet (5) has can reduce the circular-arc edge that stress is concentrated.
4. waste heat boiler according to claim 1 and 2; it is characterized in that, the mouth of pipe of the mouth of pipe of the described heat exchanger tube (2) in described entrance bobbin carriage (92) and the described heat exchanger tube (2) in described outlet bobbin carriage (93) is provided with protective casing (8).
5. waste heat boiler according to claim 4, is characterized in that, described protective casing (8) is that earthenware or the alloy material that corroded by resistance to metal dusting are made.
6. waste heat boiler according to claim 1, is characterized in that, in the inwall top casting of described entrance bobbin carriage (92), has Monofrax.
7. waste heat boiler according to claim 1, is characterized in that, in the inwall top casting of described outlet bobbin carriage (93), has Monofrax.
8. according to the waste heat boiler described in claim 6 or 7, it is characterized in that, described Monofrax is high density aluminum oxide, and is double-decker.
9. waste heat boiler according to claim 1 and 2, is characterized in that, described heat exchanger tube (2) is arranged on the both sides up and down of described intervalve (7) symmetrically.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320672268.0U CN203586173U (en) | 2013-10-29 | 2013-10-29 | Waste heat boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320672268.0U CN203586173U (en) | 2013-10-29 | 2013-10-29 | Waste heat boiler |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203586173U true CN203586173U (en) | 2014-05-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320672268.0U Expired - Fee Related CN203586173U (en) | 2013-10-29 | 2013-10-29 | Waste heat boiler |
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| CN (1) | CN203586173U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107091471A (en) * | 2017-04-22 | 2017-08-25 | 天华化工机械及自动化研究设计院有限公司 | Coke pressure gasification process coal gas heat energy recovering method |
| EP3159646B2 (en) † | 2015-10-20 | 2021-12-29 | Borsig GmbH | Heat exchanger |
-
2013
- 2013-10-29 CN CN201320672268.0U patent/CN203586173U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3159646B2 (en) † | 2015-10-20 | 2021-12-29 | Borsig GmbH | Heat exchanger |
| CN107091471A (en) * | 2017-04-22 | 2017-08-25 | 天华化工机械及自动化研究设计院有限公司 | Coke pressure gasification process coal gas heat energy recovering method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140507 Termination date: 20181029 |
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| CF01 | Termination of patent right due to non-payment of annual fee |