CN111623337A - Natural circulation ferrosilicon exhaust-heat boiler circulation system - Google Patents
Natural circulation ferrosilicon exhaust-heat boiler circulation system Download PDFInfo
- Publication number
- CN111623337A CN111623337A CN202010585572.6A CN202010585572A CN111623337A CN 111623337 A CN111623337 A CN 111623337A CN 202010585572 A CN202010585572 A CN 202010585572A CN 111623337 A CN111623337 A CN 111623337A
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- circulation
- boiler
- header
- heating surface
- steam
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 229910000519 Ferrosilicon Inorganic materials 0.000 title claims abstract description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 49
- 238000010438 heat treatment Methods 0.000 claims abstract description 36
- 239000002918 waste heat Substances 0.000 claims abstract description 22
- 230000001174 ascending effect Effects 0.000 claims abstract description 14
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 11
- 239000003546 flue gas Substances 0.000 claims abstract description 11
- 239000000203 mixture Substances 0.000 claims abstract description 11
- XWHPIFXRKKHEKR-UHFFFAOYSA-N iron silicon Chemical compound [Si].[Fe] XWHPIFXRKKHEKR-UHFFFAOYSA-N 0.000 claims abstract description 10
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 229920006395 saturated elastomer Polymers 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 206010022000 influenza Diseases 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B37/00—Component parts or details of steam boilers
- F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
- F22B37/22—Drums; Headers; Accessories therefor
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B37/00—Component parts or details of steam boilers
- F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
- F22B37/10—Water tubes; Accessories therefor
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B37/00—Component parts or details of steam boilers
- F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
- F22B37/10—Water tubes; Accessories therefor
- F22B37/14—Supply mains, e.g. rising mains, down-comers, in connection with water tubes
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B37/00—Component parts or details of steam boilers
- F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
- F22B37/48—Devices for removing water, salt, or sludge from boilers; Arrangements of cleaning apparatus in boilers; Combinations thereof with boilers
- F22B37/50—Devices for removing water, salt, or sludge from boilers; Arrangements of cleaning apparatus in boilers; Combinations thereof with boilers for draining or expelling water
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
- Control Of Steam Boilers And Waste-Gas Boilers (AREA)
Abstract
The invention discloses a natural circulation ferrosilicon waste heat boiler circulation system, which comprises a boiler barrel, a downcomer, a heating surface tube bundle and an ascending tube, wherein the waste heat boiler circulation system has two circulation modes, one mode is a forced circulation mode, the other mode is a natural circulation mode, boiler water in the forced circulation mode is uniformly distributed to the heating surface tube bundle after being subjected to heat exchange by high-temperature flue gas and then changed into steam or a steam-water mixture after being pumped into an inlet header through the downcomer and the forced circulation pump by the boiler barrel, enters an outlet header, and finally returns to the boiler barrel through the ascending tube; the circulating system of the natural circulation silicon iron waste heat boiler adopts a natural circulation structure, the steam resistance phenomenon on the heating surface is avoided, heat exchange can be better carried out, and the water circulation is more reliable; a forced circulation pump is removed, so that the power load of a user unit is greatly reduced; meanwhile, a low-point pollution discharge structure is adopted, and accumulated water of the boiler is thoroughly discharged.
Description
Technical Field
The invention relates to the field of waste heat boilers, in particular to a natural circulation silicon iron waste heat boiler circulation system.
Background
The waste heat boiler comprises a boiler barrel, a movable smoke hood, a furnace mouth section flue, an oblique 1 section flue, an oblique 2 section flue, a last 1 section flue, a last 2 section flue, a charging pipe (discharging chute) groove, an oxygen lance mouth, a nitrogen sealing device, a nitrogen sealing plug, a manhole, a micro-differential pressure taking device, a support of the flue, a hanger and the like. The waste heat boiler is divided into six circulation loops, each circulation loop consists of a down pipe and an up pipe, feed water of each section of flue is introduced into a lower header of each flue from the boiler barrel through the down pipe and then enters each heating surface, and steam generated by water passing through the heating surfaces enters an inlet header and then is introduced into the boiler barrel through the up pipe. All the flues are connected by flanges;
high-temperature flue gas released by burning coal is conveyed to an inlet of a waste heat boiler through a flue, then flows through a heater, an evaporator and an economizer, and is discharged into the atmosphere through a chimney, the exhaust gas temperature is generally 150-180 ℃, and the heat released when the temperature of the flue gas is reduced from high temperature to the exhaust gas temperature is used for changing water into steam. Boiler feed water firstly enters the economizer, and the water absorbs heat in the economizer, is heated to a saturation temperature slightly lower than the pressure of a steam drum and enters the boiler barrel. After the water entering the drum is mixed with saturated water in the drum, the water enters the evaporator along a downcomer below the drum to absorb heat and start to produce steam, and only part of the water is usually changed into steam, so that steam-water mixture flows in the evaporator. The steam-water mixture leaves the evaporator and enters the upper drum to be separated through steam-water separation equipment, water falls into the water space in the drum and enters the downcomer to continuously absorb heat and generate steam, and steam enters the superheater from the upper part of the drum to absorb heat so that saturated steam is changed into superheated steam. Three heating surfaces, namely an economizer, an evaporator and a superheater, are corresponding according to three stages of a steam production process, and if superheated steam is not needed, only saturated steam is needed, and the superheater can be omitted. When reheated steam exists, a reheater can be additionally arranged
At present, silicon iron waste heat boilers are of forced circulation structures, the structures need to be internally circulated through a forced circulation pump, the power consumption in the boilers is large, and the problems that a heating surface pipe and a header water storage tank cannot be discharged cleanly exist. This scheme adopts natural circulation structure, need not increase the force-feed circulation pump, and the low point has the blowdown header, can arrange the water of receiving the hot side and header to the greatest extent. The difficult problem is thoroughly solved.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a natural circulation silicon iron waste heat boiler circulation system which comprises a boiler barrel, a descending pipe, a heating surface pipe bundle and an ascending pipe.
Preferably, the boiler water in the forced circulation mode is pumped into the inlet header through the downcomer by the forced circulation pump, then is evenly distributed to the heating surface tube bundle, is subjected to heat exchange by high-temperature flue gas, is changed into steam or a steam-water mixture, enters the outlet header, and finally returns to the boiler barrel through the riser.
Preferably, the heating surface tube bundle in the forced circulation mode is of a coil structure, and has both an ascending tube and a descending tube, and an elbow.
Preferably, the inlet header and the outlet header are arranged at the upper end, and accumulated water in the heating surface tube bundle cannot be drained completely.
Preferably, the furnace water in the natural circulation mode enters the first header through a downcomer from the boiler barrel, is equally divided to the heating surface tube bundle through the second header, is subjected to heat exchange by high-temperature flue gas, is changed into steam or a steam-water mixture, passes through the third header, is introduced into the fourth header, passes through an ascending pipe, and returns to the boiler barrel.
Preferably, the heating surface tube bundle in the natural circulation mode is of a straight tube structure and is a riser, so that the steam resistance phenomenon does not exist.
Preferably, the first header is a low point, and accumulated water in the heating surface tube bundle can be completely drained.
Compared with the prior art, the invention has the following beneficial effects: the circulating system of the natural circulation silicon iron waste heat boiler adopts a natural circulation structure, the steam resistance phenomenon on the heating surface is avoided, heat exchange can be better carried out, and the water circulation is more reliable; a forced circulation pump is removed, so that the power load of a user unit is greatly reduced; meanwhile, a low-point pollution discharge structure is adopted, and accumulated water of the boiler is thoroughly discharged.
Drawings
FIG. 1 is a schematic diagram of a forced circulation of a circulating system of a natural circulation ferrosilicon waste heat boiler according to the present invention;
FIG. 2 is a schematic diagram of the natural circulation of the circulating system of the naturally circulating ferrosilicon waste heat boiler of the present invention;
in the figure: 1. a drum; 2. a down pipe; 3. a forced circulation pump; 4. a heated surface tube bundle; 5. an inlet header; 6. an outlet header; 7. a riser pipe; 8. a first header; 9. a second header; 10. a third header; 11. and (4) collecting the header.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-2, the circulating system of a natural circulation silicon iron waste heat boiler comprises a boiler barrel 1, a downcomer 2, a heating surface tube bundle 4 and an upcomer 7, and the circulating system of the waste heat boiler has two circulation modes, one is a forced circulation mode, and the other is a natural circulation mode.
The boiler water in the forced circulation mode is pumped into an inlet header 5 from the boiler barrel 1 through a downcomer 2 and a forced circulation pump 3, then is evenly distributed to a heating surface tube bundle 4, is subjected to heat exchange through high-temperature flue gas, is changed into steam or a steam-water mixture, enters an outlet header 6, and finally returns to the boiler barrel 1 through an ascending pipe 7.
The heating surface tube bundle 4 in the forced circulation mode is of a coiled tube structure and is provided with an ascending tube and a descending tube, and an elbow.
The inlet header 5 and the outlet header 6 are arranged at the upper end, and accumulated water in the heating surface tube bundle 4 cannot be drained completely.
The boiler water in the natural circulation mode enters a first header 8 from the boiler barrel 1 through a down pipe 2, is evenly distributed to a heating surface tube bundle 4 through a second header 9, is changed into steam or a steam-water mixture after heat exchange of high-temperature flue gas, passes through a third header 10, is introduced into a fourth header 11, then passes through a rising pipe 7 and returns to the boiler barrel 1.
The heating surface tube bundle 4 in the natural circulation mode is of a straight tube structure and is an ascending tube, and the steam resistance phenomenon does not exist.
The first header 8 is a low point and can completely drain accumulated water in the heating surface tube bundle 4.
The forced circulation system includes: furnace water is pumped into an inlet header 5 from a boiler barrel 1 through a downcomer 2 and a forced circulation pump 3, then is evenly distributed to a heating surface tube bundle 4, is changed into steam or a steam-water mixture after heat exchange of high-temperature flue gas, enters an outlet header 6, and finally returns to the boiler barrel 1 through an ascending pipe 7;
the heating surface tube bundle 4 of the system is of a serpentine tube structure, and is provided with an ascending tube and a descending tube, and an elbow, so that the steam resistance is large, and the steam resistance is easy to form at the elbow; the header is arranged at the upper end, and accumulated water in the heating surface tube bundle 4 cannot be drained completely;
the natural circulation system comprises: furnace water enters a first header 8 (capable of discharging pollution at a low point) from the boiler barrel 1 through a downcomer 2, is evenly distributed to a heating surface tube bundle 4 through a second header 9, is changed into steam or a steam-water mixture after heat exchange of high-temperature flue gas, is introduced into a fourth header 11 through a third header 10, and then returns to the boiler barrel 1 through an upcomer 7;
the heating surface tube bundle 4 of the system is of a straight tube structure and is an ascending tube, so that the steam resistance phenomenon does not exist, and the water circulation is reliable; the first header 8 is a low point, so that accumulated water in the heating surface tube bundle 4 can be completely drained;
a natural circulation structure is adopted, the steam resistance phenomenon on the heating surface is avoided, heat exchange can be better carried out, and water circulation is more reliable; a forced circulation pump is removed, so that the power load of a user unit is greatly reduced; meanwhile, a low-point pollution discharge structure is adopted, and accumulated water of the boiler is thoroughly discharged.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. Natural circulation ferrosilicon exhaust-heat boiler circulation system, this exhaust-heat boiler circulation system include boiler barrel (1), downcomer (2), heating surface tube bank (4) and tedge (7), its characterized in that: the waste heat boiler circulation system has two circulation modes, wherein one mode is a forced circulation mode, and the other mode is a natural circulation mode.
2. The circulating system of a natural circulation silicon iron waste heat boiler according to claim 1, characterized in that: the boiler water in the forced circulation mode is pumped into an inlet header (5) from the boiler barrel (1) through a downcomer (2) and a forced circulation pump (3), then is uniformly distributed to a heating surface tube bundle (4), is subjected to heat exchange by high-temperature flue gas, is changed into steam or a steam-water mixture, enters an outlet header (6), and finally returns into the boiler barrel (1) through an ascending pipe (7).
3. The circulating system of a natural circulation silicon iron waste heat boiler according to claim 2, characterized in that: the heating surface tube bundle (4) in the forced circulation mode is of a coiled tube structure and is provided with an ascending tube, a descending tube and an elbow.
4. The circulating system of a natural circulation silicon iron waste heat boiler according to claim 2, characterized in that: the inlet header (5) and the outlet header (6) are arranged at the upper end, and accumulated water in the heating surface tube bundle (4) cannot be drained.
5. The circulating system of a natural circulation silicon iron waste heat boiler according to claim 1, characterized in that: the boiler water in the natural circulation mode enters a first header (8) from a boiler barrel (1) through a downcomer (2), is uniformly distributed to a heating surface tube bundle (4) through a second header (9) and is subjected to heat exchange by high-temperature flue gas to become steam or a steam-water mixture, and is introduced into a fourth header (11) through a third header (10), then passes through an ascension pipe (7) and returns to the boiler barrel (1).
6. The circulating system of the natural circulation ferrosilicon waste heat boiler of claim 5, characterized in that: the heating surface tube bundle (4) in the natural circulation mode is of a straight tube structure and is an ascending tube, and the steam resistance phenomenon does not exist.
7. The circulating system of the natural circulation ferrosilicon waste heat boiler of claim 5, characterized in that: the first header (8) is a low point and can completely drain accumulated water in the heating surface tube bundle (4).
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010585572.6A CN111623337A (en) | 2020-06-23 | 2020-06-23 | Natural circulation ferrosilicon exhaust-heat boiler circulation system |
| PCT/CN2020/133280 WO2021258646A1 (en) | 2020-06-23 | 2020-12-02 | Natural circulation ferrosilicon waste heat boiler circulation system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010585572.6A CN111623337A (en) | 2020-06-23 | 2020-06-23 | Natural circulation ferrosilicon exhaust-heat boiler circulation system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111623337A true CN111623337A (en) | 2020-09-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010585572.6A Pending CN111623337A (en) | 2020-06-23 | 2020-06-23 | Natural circulation ferrosilicon exhaust-heat boiler circulation system |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN111623337A (en) |
| WO (1) | WO2021258646A1 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112856377A (en) * | 2021-01-29 | 2021-05-28 | 江苏太湖锅炉股份有限公司 | Lifting type boiler heating surface and working method thereof |
| CN113217896A (en) * | 2021-05-08 | 2021-08-06 | 江苏太湖锅炉股份有限公司 | Boiler plant of natural circulation |
| CN113237049A (en) * | 2021-06-03 | 2021-08-10 | 江苏太湖锅炉股份有限公司 | Novel centralized pollution discharge device |
| WO2021258646A1 (en) * | 2020-06-23 | 2021-12-30 | 江苏太湖锅炉股份有限公司 | Natural circulation ferrosilicon waste heat boiler circulation system |
| CN114608000A (en) * | 2021-05-27 | 2022-06-10 | 中北大学 | Bending tube steam boiler with intelligent elastic control change |
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| CN101451706A (en) * | 2007-11-28 | 2009-06-10 | 中国恩菲工程技术有限公司 | Circulating system of exhaust-heating boiler |
| CN202349976U (en) * | 2011-11-07 | 2012-07-25 | 中江能源回收（扬州）有限公司 | Waste heat boiler for zinc concentrate acid-making |
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| CN212377956U (en) * | 2020-06-23 | 2021-01-19 | 江苏太湖锅炉股份有限公司 | Natural circulation ferrosilicon exhaust-heat boiler circulation system |
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-
2020
- 2020-06-23 CN CN202010585572.6A patent/CN111623337A/en active Pending
- 2020-12-02 WO PCT/CN2020/133280 patent/WO2021258646A1/en active Application Filing
Patent Citations (4)
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| CN101451706A (en) * | 2007-11-28 | 2009-06-10 | 中国恩菲工程技术有限公司 | Circulating system of exhaust-heating boiler |
| CN202349976U (en) * | 2011-11-07 | 2012-07-25 | 中江能源回收（扬州）有限公司 | Waste heat boiler for zinc concentrate acid-making |
| CN210533075U (en) * | 2019-09-02 | 2020-05-15 | 南通万达锅炉有限公司 | Novel high-efficient cement kiln hood combined overheating waste heat boiler |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021258646A1 (en) * | 2020-06-23 | 2021-12-30 | 江苏太湖锅炉股份有限公司 | Natural circulation ferrosilicon waste heat boiler circulation system |
| CN112856377A (en) * | 2021-01-29 | 2021-05-28 | 江苏太湖锅炉股份有限公司 | Lifting type boiler heating surface and working method thereof |
| CN113217896A (en) * | 2021-05-08 | 2021-08-06 | 江苏太湖锅炉股份有限公司 | Boiler plant of natural circulation |
| CN114608000A (en) * | 2021-05-27 | 2022-06-10 | 中北大学 | Bending tube steam boiler with intelligent elastic control change |
| CN114608000B (en) * | 2021-05-27 | 2023-03-03 | 中北大学 | Bending tube steam boiler with intelligent elastic control change |
| CN113237049A (en) * | 2021-06-03 | 2021-08-10 | 江苏太湖锅炉股份有限公司 | Novel centralized pollution discharge device |
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| Publication number | Publication date |
|---|---|
| WO2021258646A1 (en) | 2021-12-30 |
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