CN105299618A - Uniform-temperature superheater for waste incineration boiler and superheated steam heating method - Google Patents

Uniform-temperature superheater for waste incineration boiler and superheated steam heating method Download PDF

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Publication number
CN105299618A
CN105299618A CN201510833953.0A CN201510833953A CN105299618A CN 105299618 A CN105299618 A CN 105299618A CN 201510833953 A CN201510833953 A CN 201510833953A CN 105299618 A CN105299618 A CN 105299618A
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China
Prior art keywords
blender
tube
superheated steam
superheater
several
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Pending
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CN201510833953.0A
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Chinese (zh)
Inventor
蔡文钢
陈金火
郝小波
龚俊
周晓
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China Western Power Industrial Co Ltd
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China Western Power Industrial Co Ltd
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Priority to CN201510833953.0A priority Critical patent/CN105299618A/en
Publication of CN105299618A publication Critical patent/CN105299618A/en
Pending legal-status Critical Current

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Abstract

The invention discloses a uniform-temperature superheater for a waste incineration boiler and a superheated steam heating method. The uniform-temperature superheater comprises a plurality of unit tube groups, wherein each unit tube group comprises an inlet mixer, an outlet mixer and a plurality of U-shaped superheating tubes which are connected between the inlet mixer and the outlet mixer in parallel; and the plurality of unit tube groups are sequentially arrayed, wherein the outlet mixer of the previous unit tube group is connected with the inlet mixer of the next unit tube group through a plurality of connection tubes which are connected in parallel. The uniform-temperature superheater disclosed by the invention is convenient to manufacture, short in tube pass, capable of improving the uniformity of the flow rate and the flow speed of steam in each section of tube and enabling the temperature of each section of tube to be balanced, and capable of preventing that the temperatures of the tubes are too high to accelerate corrosion to cause tube burst, thus benefiting to long-time stable running of the boiler.

Description

For samming superheater and the superheated steam heating means of garbage burning boiler
Technical field
The present invention relates to a kind of superheater and superheated steam heating means, especially for samming superheater and the superheated steam heating means of garbage burning 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.
Shown in superheater Fig. 2, Fig. 3 of current routine, the several coiled pipes 9 comprising import blender 7, outlet blender 8 and be connected in parallel between import blender 7 and outlet blender 8, coiled pipe 9 is by the superheated steam in heating tube while flue gas, 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 samming superheater for garbage burning 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, samming superheater for garbage burning boiler of the present invention, it is characterized in that: comprise several unit pipes group, each unit pipes group 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 unit pipes group is arranged in order, and wherein the outlet blender of previous element pipe group is connected by several tube connector in parallel with the import blender of next unit pipes group;
Be suitable for the superheated steam heating means of the above-mentioned samming superheater for garbage burning boiler, it is characterized in that following steps: A) superheated steam is passed into the import blender of first module pipe group, 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, superheated steam enters the import blender of next unit pipe group again in outlet blender by tube connector after mixing; B) superheated steam is through the heating that repeats for several times and mixing, and after each heating and mixing, temperature rise is a bit of, until discharged by the outlet blender of most end unit pipes group.
Several unit pipes group is connected by the tube connector of several parallel connection by the present invention, and steam enters next unit pipes group again after upper unit pipes group heating is a bit of, superheater tube in each unit pipes group 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, corrected in the individual unit Guan Zuzhong thermal deviation that inequality causes of being heated, avoid the accumulation of thermal deviation, the uniformity of steam flow and flow velocity in each unit pipes group 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 unit pipes group are all identical; Can further improve the harmony of U-shaped superheater tube Guan Wen.
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 tube 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 schematic diagram of the present invention for the samming superheater embodiment of garbage burning 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 samming superheater of garbage burning boiler, comprise four unit pipes groups 1, each unit pipes group 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 unit pipes group 1 are all identical; Four unit pipes groups 1 are arranged in order, and wherein the outlet blender 3 of previous element pipe group is mixed 2-in-1 device with the import of next unit pipes group and is connected by several tube connector 5 in parallel;
Be suitable for the superheated steam heating means of the above-mentioned samming superheater for garbage burning boiler, following steps: A) superheated steam is passed into the import blender 2 of first module pipe group 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, superheated steam enters the import blender 2 of next unit pipe group again in outlet blender 3 by tube connector 5 after mixing; B) superheated steam is through the heating that repeats for several times and mixing, and after each heating and mixing, temperature rise is a bit of, as 10-20 DEG C, until discharged by the outlet blender of most end unit pipes group.
Several unit pipes group 1 is connected by the tube connector 5 of several parallel connection by the present invention, and steam enters next unit pipes group again after upper unit pipes group heating temperature rise is a bit of, superheater tube 4 in each unit pipes group 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 U-shaped superheater tubes 4 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 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 individual unit pipe group 1 causes is corrected, avoid the accumulation of thermal deviation, the uniformity of steam flow and flow velocity in each unit pipes group 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.

Claims (3)

1. the samming superheater for garbage burning boiler, it is characterized in that: comprise several unit pipes group, each unit pipes group 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 unit pipes group is arranged in order, and wherein the outlet blender of previous element pipe group is connected by several tube connector in parallel with the import blender of next unit pipes group.
2. the samming superheater for garbage burning boiler according to claim 1, is characterized in that: internal diameter and the tube side of the several U-shaped superheater tubes in each unit pipes group are all identical.
3. be suitable for as claimed in claim 1 for the superheated steam heating means of the samming superheater of garbage burning boiler, it is characterized in that following steps: A) superheated steam is passed into the import blender of first module pipe group, 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, superheated steam enters the import blender of next unit pipe group again in outlet blender by tube connector after mixing; B) superheated steam is through the heating that repeats for several times and mixing, and after each heating and mixing, temperature rise is a bit of, until discharged by the outlet blender of most end unit pipes group.
CN201510833953.0A 2015-11-26 2015-11-26 Uniform-temperature superheater for waste incineration boiler and superheated steam heating method Pending CN105299618A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105737136B (en) * 2016-04-26 2018-08-14 浙江伟明环保股份有限公司 A kind of U-tube superheater

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1327032A (en) * 1917-11-08 1920-01-06 Milton Kraemer Superheater
US6178924B1 (en) * 1996-12-19 2001-01-30 Kvaerner Pulping Oy Method for upgrading a boiler
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
CN101551100A (en) * 2009-04-17 2009-10-07 武汉都市环保工程技术股份有限公司 Integrated fume dustfall stem superheater
CN101981373A (en) * 2008-03-27 2011-02-23 阿尔斯托姆科技有限公司 Continuous steam generator with equalizing chamber
CN202598485U (en) * 2012-05-28 2012-12-12 无锡东马锅炉有限公司 Furnace for reheating waste heat steam in steel mill
CN203442788U (en) * 2013-08-22 2014-02-19 无锡东马锅炉科技有限公司 Double-pressure saturated steam after-burning boiler
CN204005915U (en) * 2014-07-11 2014-12-10 宁波海越新材料有限公司 The hydrogen re-use device of supporting dehydrogenating propane device
JP2015117844A (en) * 2013-12-16 2015-06-25 三菱日立パワーシステムズ株式会社 Superheater and boiler
CN205372524U (en) * 2015-11-26 2016-07-06 华西能源工业股份有限公司 A samming over heater for msw incineration boiler

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1327032A (en) * 1917-11-08 1920-01-06 Milton Kraemer Superheater
US6178924B1 (en) * 1996-12-19 2001-01-30 Kvaerner Pulping Oy Method for upgrading a boiler
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
CN101981373A (en) * 2008-03-27 2011-02-23 阿尔斯托姆科技有限公司 Continuous steam generator with equalizing chamber
CN101551100A (en) * 2009-04-17 2009-10-07 武汉都市环保工程技术股份有限公司 Integrated fume dustfall stem superheater
CN202598485U (en) * 2012-05-28 2012-12-12 无锡东马锅炉有限公司 Furnace for reheating waste heat steam in steel mill
CN203442788U (en) * 2013-08-22 2014-02-19 无锡东马锅炉科技有限公司 Double-pressure saturated steam after-burning boiler
JP2015117844A (en) * 2013-12-16 2015-06-25 三菱日立パワーシステムズ株式会社 Superheater and boiler
CN204005915U (en) * 2014-07-11 2014-12-10 宁波海越新材料有限公司 The hydrogen re-use device of supporting dehydrogenating propane device
CN205372524U (en) * 2015-11-26 2016-07-06 华西能源工业股份有限公司 A samming over heater for msw incineration boiler

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105737136B (en) * 2016-04-26 2018-08-14 浙江伟明环保股份有限公司 A kind of U-tube superheater

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