CN105276565A - Superheater for waste incineration waste heat boiler and superheated steam heating method - Google Patents
Superheater for waste incineration waste heat boiler and superheated steam heating method Download PDFInfo
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- CN105276565A CN105276565A CN201510835155.1A CN201510835155A CN105276565A CN 105276565 A CN105276565 A CN 105276565A CN 201510835155 A CN201510835155 A CN 201510835155A CN 105276565 A CN105276565 A CN 105276565A
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- superheater
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- superheated steam
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Abstract
The invention discloses a superheater for waste incineration waste heat boiler and a superheated steam heating method. The superheater comprises a plurality of superheater subunits. Each superheater subunit comprises an inlet mixer, an outlet mixer and a plurality of U-shaped superheating pipes connected between the inlet mixer and the outlet mixer in parallel. The superheater subunits are arranged in sequence, and the outlet mixers of the previous superheater subunits are connected with the inlet mixers of the next superheater subunits through a plurality of crossing temperature equilibrium pipes. The superheater is convenient to manufacture and short in pipe pass; the steam flow in all the pipes and evenness of the flow speed can be improved, and the pipe temperature of all parts tends to be balanced; and the situation that corrosion is accelerated by too high temperature of the pipes, and consequently the pipes explode can be avoided, and long-time stable running of the boiler is facilitated.
Description
Technical field
The present invention relates to a kind of superheater and superheated steam heating means, especially for superheater and the superheated steam heating means of refuse incineration exhaust-heating boiler.
Background technology
Enter 21 century, along with living standards of the people improve, the quantity of refuse of generation is also increasing, and many big cities have formed the quagmire of being surrounded by rubbish, and the treatment and disposal problem of rubbish is put in face of us.And burning electricity generation is the most effective way of process domestic waste, not only can reach the object at utmost subtracting appearance, and flue gas also can reach the environmental protection standard of national regulation after treatment, unlikelyly cause secondary pollution, the heat energy that waste incineration discharges can also be used, reduce the use amount of coal, reduce carbon emission.Waste incineration and generating electricity is a kind of available sources of the environmental protection energy.
Containing a large amount of chlorine elements in house refuse, simultaneously also containing elements such as a considerable amount of K, Na, S, their incineration ashes has very strong corrosivity.High temperature corrosion in Refuse Incineration Process mainly occurs in superheater area, causes primarily of the chlorine element in fuel.Chlorine element plays the role of catalyst in whole chemical reaction chain.In garbage burning boiler, as long as there is pickup thing in metal pipe-wall, wherein just containing chlorine element, and there is tight association between the high temperature corrosion that chlorine element causes and heating surface tube wall temperature, as shown in Figure 1, along with the increase of tube wall temperature, corrosion of metal speed is also accelerated, and heating surface tube wall temperature when being in 400-700 DEG C of temperature province high temperature corrosion fastest, increase in geometry level; Even if the very high corrosion rate of tube wall temperature also slowly when tube wall is smooth.There is many low melting points in the product of waste incineration, they have stronger pickup characteristic, so be inevitable outcome with sticking in flow of flue gas process on heating surface metal pipe-wall.And vapor (steam) temperature is generally about 400 DEG C in current incinerator high temperature overheater, heated tubular tube wall temperature is easily in corrosion region, and superheater tube interest belongs to outside wall temperature and can be calculated as follows:
t
cm=t+Δt+β×q
max×[δ/λ/（β+1）+1/α
2]
In formula
In the medium mean temperature of Bottomhole pressure in section required by t-, DEG C;
In the pipe that Δ t-thermic load is maximum, medium temperature exceedes the value of mean temperature, DEG C;
The ratio of β-tube outer diameter and internal diameter;
Q
maxthe pipe that-thermic load is maximum, the thermic load of caloric receptivity maximum, kcal/m
2h;
δ-pipe thickness, m;
The thermal conductivity factor of λ-tube wall metal, kcal/m
2h DEG C;
α
2-tube wall to the exothermic coefficient of heated medium, kcal/m
2h DEG C.α
2increase with the increase of steam flow rate.
From above formula, tube wall temperature is had the greatest impact, what play a decisive role is medium temperature, flow velocity etc.
As shown in Figure 2 and Figure 3, comprise import blender 7, export blender 8 and be connected in parallel on the several coiled pipes 9 between import blender 7 and outlet blender 8, coiled pipe 9 is by the superheated steam in heating tube while flue gas for the superheater of current routine, during use, superheated steam is passed into by import blender 7, is discharged after the several coiled pipes 9 in flue heat by outlet blender 8, this structure adopts one-time heating to put in place to superheated steam, because the tube side in every root coiled pipe 9 is longer, elbow is many, not only more difficult processing, the error of its accuracy of manufacture is also larger, particularly in pipe, cross section is difficult to ensure evenly, in heated vapours process, cannot ensure that in every root pipe, steam flow is impartial completely, flow velocity is balanced, therefore part coiled pipe 9 causes local location tube wall temperature high because steam flow rate is lower, because tube side is longer, its vapor (steam) temperature deviation can superpose gradually, more long-pending larger, cause heating surface tube localized metal temperatures high compared with other regions, and deviation is larger, this regional area high temperature corrosion is impelled to accelerate, finally there is the phenomenon of superheater tubes burst, cannot ensure that the long-term stability of boiler is run.
Summary of the invention
For the technical problem of above-mentioned existence, the invention provides a kind of superheater for refuse incineration exhaust-heating boiler and superheated steam heating means, it is not only convenient to manufacture, and its tube side is shorter, the uniformity of steam flow and flow velocity in each section of pipe can be improved, and make each portion Guan Wen be tending towards balanced, can prevent too high accelerated corrosion and the booster of causing of tube temperature, the long-term stability being beneficial to boiler is run.
In order to achieve the above object, superheater for refuse incineration exhaust-heating boiler of the present invention, it is characterized in that: comprise several superheater subdivision, each superheater subdivision includes an import blender, an outlet blender and is connected in parallel on the several U-shaped superheater tubes between import blender and outlet blender; Several superheater subdivision is arranged in order, and wherein the outlet blender of previous superheater subdivision is connected by several samming pipe intersected with the import blender of next superheater subdivision;
Be suitable for the superheated steam heating means of the above-mentioned superheater for refuse incineration exhaust-heating boiler, it is characterized in that following steps: A) superheated steam is passed into the import blender of the first superheater subdivision, outlet blender is entered again by several U-shaped superheater tubes in parallel, U-shaped superheater tube is placed in flue, by the superheated steam heated again after flue gas in it, after superheated steam mixes in outlet blender, then the import blender of next superheater subdivision of several roads cross-entry is divided into mix by samming pipe; B) superheated steam passes through heating, the mixing of several repetition and the mixing that intersects, and the rear temperature rise of mixing of heating at every turn, mix and intersect is a bit of, until discharged by the outlet blender of most end superheater subdivision.
Several superheater subdivision is connected by the samming pipe of several intersection by the present invention, and superheated steam enters next superheater subdivision again after upper superheater subdivision heating, superheater tube in each superheater subdivision is U-shaped pipe, its tube side is shorter, an only elbow, not only be convenient to manufacture, and superheated steam heating procedure is short in pipe, in its pipe, the uniformity in cross section is higher, many pipes in parallel make flow path resistance little, even if there is resistance error, its numerical value is also less, mix very soon in its outlet blender at the temperature deviation caused after the heat absorption of a section shorter, after mixing, vapor (steam) temperature is overall balanced, the thermal deviation that inequality of being heated in single superheater subdivision causes is corrected, by the samming pipe of several intersection, superheated steam intersection can be passed into the import blender of next superheater subdivision, superheated steam is again mixed in this import blender, further correction thermal deviation, avoid the accumulation of thermal deviation, and the superposition of resistance in each superheater subdivision cascade process of equilibrium, the uniformity of steam flow and flow velocity in each superheater subdivision pipe can be improved, and make each portion Guan Wen be tending towards balanced, can prevent that pipe local temperature is too high causes accelerated corrosion and booster, the long-term stability being beneficial to boiler is run.
Preferred as one, internal diameter and the tube side of the several U-shaped superheater tubes in each superheater subdivision are all identical; The samming pipe of several intersection one group between two, two samming pipe cross-join outlet blender and import blenders often in group; Can further improve the harmony of U-shaped superheater tube Guan Wen, and reduce length and the height of samming pipe, not only cost-saving but also be convenient to manufacture.
In sum, the present invention is not only convenient to manufacture, and its tube side is shorter, the uniformity of steam flow and flow velocity in each section of pipe can be improved, and make each portion Guan Wen be tending towards balanced, can prevent too high accelerated corrosion and the booster of causing of pipe local temperature, the long-term stability being beneficial to boiler is run.
Accompanying drawing explanation
Fig. 1 is the curve map of superheater tube wall temperature and corrosion rate in chloride flue gas.
Fig. 2 is the front view of existing superheater.
Fig. 3 is the left view of Fig. 2.
Fig. 4 is the front view of the present invention for the superheater embodiment of refuse incineration exhaust-heating boiler.
Fig. 5 is the left view of Fig. 4.
Detailed description of the invention
Below in conjunction with accompanying drawing, the present invention is further detailed explanation.
As shown in Fig. 4 to Fig. 5, the present invention is used for the superheater of refuse incineration exhaust-heating boiler, comprise five superheater subdivisions 1, each superheater subdivision 1 includes an import blender 2, outlet blender 3 and is connected in parallel on the several U-shaped superheater tubes 4 between import blender 2 and outlet blender 3, and internal diameter and the tube side of the several U-shaped superheater tubes 4 in each superheater subdivision are all identical; Five superheater subdivisions 1 are arranged in order, wherein the outlet blender 3 of previous superheater subdivision is connected by eight samming pipes 5 with the import blender 2 of next superheater subdivision, an eight samming pipes 5 between two component are four groups, two samming pipe 5 cross-join outlet blenders 3 often in group and import blenders 2;
The present invention is suitable for the superheated steam heating means of the above-mentioned superheater for refuse incineration exhaust-heating boiler, comprise the following steps: A) superheated steam is passed into the import blender 2 of the first superheater subdivision 1, outlet blender 3 is entered again by several U-shaped superheater tubes 4 in parallel, U-shaped superheater tube 4 is placed in flue, by the superheated steam heated again after flue gas in it, after superheated steam mixes in outlet blender 3, then be divided into the import blender mixing 2 of eight next superheater subdivision of tunnel cross-entry by samming pipe 5; B) superheated steam passes through heating, the mixing of several repetition and the mixing that intersects, and the rear temperature rise of mixing of heating at every turn, mix and intersect is a bit of, as 10-20 DEG C, until discharged by the outlet blender of most end superheater subdivision.
Five superheater subdivisions 1 are connected by the samming pipe 5 of several intersection by the present invention, and superheated steam enters next superheater subdivision again after upper superheater subdivision heating, superheater tube 4 in each superheater subdivision 1 is U-shaped pipe, its tube side is shorter, an only elbow, not only be convenient to manufacture, and superheated steam heating procedure is short in pipe, in its pipe, the uniformity of cross section media flow is higher, many pipes in parallel make flow path resistance more even, even if there is resistance error, its numerical value is also less, mix very soon in its outlet blender 3 at the temperature deviation caused after the heat absorption of a section shorter, after mixing, vapor (steam) temperature is overall balanced, the thermal deviation that inequality of being heated in single superheater subdivision 1 causes is corrected, by the samming pipe 5 of several intersection, superheated steam intersection can be passed into the import blender 2 of next superheater subdivision, superheated steam is again mixed in this import blender 2, further correction thermal deviation, avoid the accumulation of thermal deviation, by repeatedly mixing the superposition of resistance in each superheater subdivision cascade process of Pool-ing Equilibrium, the uniformity of steam flow and flow velocity in each superheater subdivision pipe can be improved, and make each portion Guan Wen be tending towards balanced, can prevent that pipe local temperature is too high causes accelerated corrosion and booster, the long-term stability being beneficial to boiler is run, several U-shaped superheater tubes 4 of same inner diameter and tube side can further improve the harmony of its Guan Wen, and one group and the samming pipe 5 intersected can reduce length and the height of samming pipe between two, not only cost-saving but also be convenient to manufacture.
Claims (3)
1. the superheater for refuse incineration exhaust-heating boiler, it is characterized in that: comprise several superheater subdivision, each superheater subdivision includes an import blender, an outlet blender and is connected in parallel on the several U-shaped superheater tubes between import blender and outlet blender; Several superheater subdivision is arranged in order, and wherein the outlet blender of previous superheater subdivision is connected by several samming pipe intersected with the import blender of next superheater subdivision.
2. the superheater for refuse incineration exhaust-heating boiler according to claim 1, is characterized in that: internal diameter and the tube side of the several U-shaped superheater tubes in each superheater subdivision are all identical; The samming pipe of several intersection one group between two, two samming pipe cross-join outlet blender and import blenders often in group.
3. be suitable for as claimed in claim 1 for the superheated steam heating means of the superheater of refuse incineration exhaust-heating boiler, it is characterized in that following steps: A) superheated steam is passed into the import blender of the first superheater subdivision, outlet blender is entered again by several U-shaped superheater tubes in parallel, U-shaped superheater tube is placed in flue, by the superheated steam heated again after flue gas in it, after superheated steam mixes in outlet blender, then the import blender of next superheater subdivision of several roads cross-entry is divided into mix by samming pipe; B) superheated steam passes through heating, the mixing of several repetition and the mixing that intersects, and the rear temperature rise of mixing of heating at every turn, mix and intersect is a bit of, until discharged by the outlet blender of most end superheater subdivision.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510835155.1A CN105276565B (en) | 2015-11-26 | 2015-11-26 | Superheater and superheated steam heating means for refuse incineration exhaust-heating boiler |
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|---|---|---|---|
| CN201510835155.1A CN105276565B (en) | 2015-11-26 | 2015-11-26 | Superheater and superheated steam heating means for refuse incineration exhaust-heating boiler |
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|---|---|
| CN105276565A true CN105276565A (en) | 2016-01-27 |
| CN105276565B CN105276565B (en) | 2018-09-28 |
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| CN201510835155.1A Active CN105276565B (en) | 2015-11-26 | 2015-11-26 | Superheater and superheated steam heating means for refuse incineration exhaust-heating boiler |
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Citations (9)
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|---|---|---|---|---|
| JPH1122914A (en) * | 1997-07-03 | 1999-01-26 | Ishikawajima Harima Heavy Ind Co Ltd | Final superheater of boiler |
| CN2495909Y (en) * | 2001-09-12 | 2002-06-19 | 王孟浩 | Mechanism for reducing temp. deviation of over-heating device of boiler reheater |
| JP2002181306A (en) * | 2000-12-14 | 2002-06-26 | Thermo Electron Kk | Superheated system generating device and superheated steam treatment equipment |
| CN1499129A (en) * | 2002-11-06 | 2004-05-26 | 上海开源锅炉工程有限公司 | System and equipment of secondary loop flow of superheater with large plate in utility boiler |
| CN203489250U (en) * | 2013-09-29 | 2014-03-19 | 刘文松 | Boiler high-enthalpy steam overheating device |
| CN104566336A (en) * | 2014-12-20 | 2015-04-29 | 无锡东马锅炉有限公司 | Screen type superheater group capable of preventing wobble and deformation |
| CN204345610U (en) * | 2014-12-11 | 2015-05-20 | 北京京诚科林环保科技有限公司 | A kind of high efficiency burnt gas formula steam superheating device |
| CN204420980U (en) * | 2014-12-19 | 2015-06-24 | 南通天蓝环保能源成套设备有限公司 | Waste Heat Boiler superheater |
| CN205332169U (en) * | 2015-11-26 | 2016-06-22 | 华西能源工业股份有限公司 | A over heater for msw incineration exhaust -heat boiler |
-
2015
- 2015-11-26 CN CN201510835155.1A patent/CN105276565B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1122914A (en) * | 1997-07-03 | 1999-01-26 | Ishikawajima Harima Heavy Ind Co Ltd | Final superheater of boiler |
| JP2002181306A (en) * | 2000-12-14 | 2002-06-26 | Thermo Electron Kk | Superheated system generating device and superheated steam treatment equipment |
| CN2495909Y (en) * | 2001-09-12 | 2002-06-19 | 王孟浩 | Mechanism for reducing temp. deviation of over-heating device of boiler reheater |
| CN1499129A (en) * | 2002-11-06 | 2004-05-26 | 上海开源锅炉工程有限公司 | System and equipment of secondary loop flow of superheater with large plate in utility boiler |
| CN203489250U (en) * | 2013-09-29 | 2014-03-19 | 刘文松 | Boiler high-enthalpy steam overheating device |
| CN204345610U (en) * | 2014-12-11 | 2015-05-20 | 北京京诚科林环保科技有限公司 | A kind of high efficiency burnt gas formula steam superheating device |
| CN204420980U (en) * | 2014-12-19 | 2015-06-24 | 南通天蓝环保能源成套设备有限公司 | Waste Heat Boiler superheater |
| CN104566336A (en) * | 2014-12-20 | 2015-04-29 | 无锡东马锅炉有限公司 | Screen type superheater group capable of preventing wobble and deformation |
| CN205332169U (en) * | 2015-11-26 | 2016-06-22 | 华西能源工业股份有限公司 | A over heater for msw incineration exhaust -heat boiler |
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|---|---|
| CN105276565B (en) | 2018-09-28 |
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