CN109798511B - Waste heat recovery device of steam boiler - Google Patents
Waste heat recovery device of steam boiler Download PDFInfo
- Publication number
- CN109798511B CN109798511B CN201811095418.XA CN201811095418A CN109798511B CN 109798511 B CN109798511 B CN 109798511B CN 201811095418 A CN201811095418 A CN 201811095418A CN 109798511 B CN109798511 B CN 109798511B
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- China
- Prior art keywords
- pipe
- hot water
- water supply
- supply pipe
- heat exchanger
- Prior art date
- 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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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B33/00—Steam-generation plants, e.g. comprising steam boilers of different types in mutual association
- F22B33/18—Combinations of steam boilers with other apparatus
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
- F22D1/02—Feed-water heaters, i.e. economisers or like preheaters with water tubes arranged in the boiler furnace, fire tubes, or flue ways
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22G—SUPERHEATING OF STEAM
- F22G1/00—Steam superheating characterised by heating method
- F22G1/02—Steam superheating characterised by heating method with heat supply by hot flue gases from the furnace of the steam boiler
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
- F28D21/0001—Recuperative heat exchangers
- F28D21/0003—Recuperative heat exchangers the heat being recuperated from exhaust gases
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Control Of Steam Boilers And Waste-Gas Boilers (AREA)
Abstract
The invention relates to a waste heat recovery device of a steam boiler, comprising: a heat exchanger group, wherein the first, second and third heat exchangers are arranged in the flue, a water supply pipe is connected with the inlet of the first heat exchanger, the outlet is connected with the boiler body through a water supply discharge pipe, the inlet and the outlet of the second heat exchanger are connected with a hot water storage tank through a hot water supply pipe and a hot water discharge pipe, the inlet of the third heat exchanger is connected with a saturated steam branch pipe connected with a saturated steam main supply pipe, and a superheated steam conduit is connected with the outlet; an inflow side connection pipe connecting the water supply pipe, the hot water supply pipe, and the saturated steam branch pipe to each other; a discharge-side connection pipe connecting the feed water discharge pipe, the hot water discharge pipe, and the superheated steam conduit to each other; and first to tenth control valves respectively provided to the feed water supply pipe, the hot water supply pipe, the saturated steam branch pipe, the inflow side connection pipe, the feed water discharge pipe, the hot water discharge pipe, the superheated steam guide pipe, and the discharge side connection pipe.
Description
Technical Field
The present invention relates to a heat recovery device for a steam boiler, and more particularly, to a heat recovery device for a steam boiler, which allows first to third heat exchangers provided in a flue to have functions of a economizer, a hot water heater, and a superheater, respectively, or to diversify the functions of the heat exchangers.
Background
As is well known, a combustion chamber of a steam boiler burns fuel to heat a heating surface by its flame or the like to generate steam, and since the temperature of exhaust gas discharged through a flue reaches 200 ℃ or higher, a superheater that superheats saturated steam to steam and a economizer that increases efficiency by preheating feed water are generally provided in the flue in order to recover the waste heat.
However, the superheater and the economizer, which are sequentially provided in the waste heat recovery apparatus of the flue, perform only specific single functions, and are inefficient in terms of utility.
Patent document 1 discloses that a superheater and hot water heater is added to a steam boiler that has only one heat exchanger in a flue and serves as both a superheater and a hot water heater.
The steam boiler of patent document 1 is additionally provided with a superheater/hot water heater in which a main supply pipe is connected to a steam chamber formed in an upper portion of a steam boiler main body, a superheater/hot water heat exchanger is provided in a flue, a saturated steam supply pipe is connected to a lower portion side of the superheater/hot water heat exchanger and an inlet of the main supply pipe, valves A, B are provided respectively behind a connection portion between the inlet of the saturated steam supply pipe and the saturated steam supply pipe of the main supply pipe, a superheated steam pipe is connected to an upper portion of the superheater/hot water heat exchanger and an outlet side of the main supply pipe, a control valve a is provided in the superheated steam pipe, a hot water pipe is connected to an inlet side of the superheated steam pipe of the control valve a, a control valve B is provided, and a pump additional water supply pipe is connected to the other lower portion side of the superheater/hot water, saturated steam or feedwater is supplied to the superheater/hot water heat exchanger to be superheated or to selectively generate hot water.
Prior art documents
Patent document
(patent document 0001) [ patent document 1 ] KR 10-1006761B 1
Disclosure of Invention
However, although the steam boiler of patent document 1 is additionally provided with a superheater/hot water heater, which has an advantage of superheating saturated steam or generating hot water by using waste heat, the heat exchanger provided in the flue can only function as a superheater or a hot water heater, and since the amount of superheated steam and the amount of hot water generated are fixed, the amount of superheated steam or hot water required is insufficient when the load is increased, and thus the demand of the consumers cannot be satisfied.
The invention aims to provide a waste heat recovery device of a steam boiler. In view of the above circumstances, the first to third heat exchangers are provided in the flue of the steam boiler, and thus, the functions of the economizer, the hot water heater, and the superheater can be individually performed, or the functions of two or more heat exchangers can be performed in the same manner, thereby satisfying the needs of consumers.
To achieve the above object, the present invention comprises: a heat exchanger group including first, second, and third heat exchangers provided in a flue, a feed water supply pipe connected to an inlet of the first heat exchanger, an outlet connected to a boiler body through a feed water discharge pipe, an inlet and an outlet of the second heat exchanger connected to a hot water storage tank through a hot water supply pipe and a hot water discharge pipe, an inlet of the third heat exchanger connected to a saturated steam branch pipe connected to a main saturated steam supply pipe, and a superheated steam duct connected to the outlet;
an inflow side connection pipe connecting the water supply pipe, the hot water supply pipe, and the saturated steam branch pipe to each other;
a discharge-side connection pipe connecting the feed water discharge pipe, the hot water discharge pipe, and the superheated steam conduit to each other; and
and first to tenth control valves respectively provided to the feed water supply pipe, the hot water supply pipe, the saturated steam branch pipe, the inflow side connection pipe, the feed water discharge pipe, the hot water discharge pipe, the superheated steam guide pipe, and the discharge side connection pipe.
As described above, according to the present invention, since the first to third heat exchangers are provided in the flue, the functions of the economizer, the hot water heater, and the superheater are performed, respectively, and the waste heat absorbing function is diversified, the utilization rate of the waste heat is improved, and the same function is performed by two or more heat exchangers, the feed water amount, the hot water amount, or the superheated steam amount can be selectively and greatly increased, and thus, the system can actively cope with a sudden change in the use load, and can increase the utilization efficiency and meet the demand of the consumer.
Drawings
FIG. 1 is a block diagram of an embodiment of the present invention.
Fig. 2 is an enlarged view of a main part of the embodiment of the present invention.
Detailed Description
Fig. 1 is a block diagram of an embodiment of the present invention, fig. 2 is an enlarged view of a main part of the embodiment of the present invention, and reference numeral 10 is a steam boiler, and the steam boiler 10 is illustrated as a tube-in-tube boiler in the drawing, and therefore, the tube-in-tube boiler will be described.
The steam boiler 10 is provided with a boiler barrel at a lower side of an inside of a boiler barrel 11, and a smoke tube is arranged at a side surface and an upper portion of the boiler barrel so that a combustion flame is turned inside the boiler barrel and discharged from a smoke duct 12 through the smoke tube, a water chamber is formed at a lower portion of the boiler barrel 11, a steam chamber is formed at an upper portion thereof, and a main saturated steam supply pipe 13 is connected to the steam chamber so as to supply saturated steam generated from the boiler barrel 11 to a saturated steam using place.
Although the above-described steam boiler is illustrated and described with respect to a known cylindrical flue tube boiler, the present invention is not limited thereto, and is not limited to a known steam boiler.
In the first heat exchanger 30, the feed water supply pipe 31 provided with the feed water pump 32 is connected to the inlet thereof, the feed water discharge pipe 33 is connected to the outlet thereof, the feed water supply pipe 31 is connected to the feed water tank 34, the feed water discharge pipe 33 is connected to the boiler body 11, and the feed water discharge pipe 33 is provided with the check valve 35, so that when the first heat exchanger 30 is used only as a economizer, the preheated feed water is supplied to the boiler body 11 after the upper water supply or the like supplied to the feed water supply pipe 31 by the feed water pump 32 is preheated by the waste heat in the first heat exchanger 30, thereby increasing the efficiency.
The second heat exchanger 40 has an inlet connected to a lower portion of the hot water storage tank 41 and a hot water supply pipe (hot water supply pipe to be heated) 42 on which a circulation pump 43 is arranged, and an outlet connected to an upper portion of the hot water storage tank 41 and a hot water discharge pipe (hot water discharge pipe after heating) 44, so that when the second heat exchanger 40 is used only as a hot water heater, the low-temperature hot water to be heated stored in the hot water storage tank 41 is heated by the residual heat in the second heat exchanger 40 to generate high-temperature hot water, and then stored in the hot water storage tank 41 and supplied to a place where the hot water is used.
In the case where the third heat exchanger 50 is connected at its inlet to the saturated steam branch pipe 51 connected to the main saturated steam supply pipe 13 and at its outlet to the superheated steam guide pipe 52, and the third heat exchanger 50 is used only as a superheater, the saturated steam generated from the boiler body 11 is supplied to the third heat exchanger 50 through the saturated steam branch pipe 51, heated by the residual heat, superheated and vaporized, and then supplied to the superheated steam use site.
The first to third heat exchangers 30, 40, 50 are provided with a plurality of rows of heat exchange tubes 21 between an inlet header 22 and an outlet header 23, thereby greatly enlarging a heat receiving area.
First to tenth control valves 70A, 70B, 70C, 70D, 70E, 70F, 70G, 70H, 70I, and 70J are provided between the water supply pipe 31, the hot water supply pipe 42, the saturated steam branch pipe 51, and the inflow side connection pipe 60A between the water supply pipe 31 and the hot water supply pipe 42, and between the hot water supply pipe 42 and the saturated steam branch pipe 51, between the water supply discharge pipe 33, the hot water discharge pipe 44, the superheated steam conduit 52, and the water discharge pipe 33 of the discharge side connection pipe 60B and the hot water discharge pipe 44, and between the hot water discharge pipe 44 and the superheated steam conduit 52.
The first to tenth control valves 70A to 70J may be manually operated or automatically controlled by a control device.
In the present invention, two of the first to third heat exchangers 30, 40, 50 may be used as a superheater, a hot water heater, and a economizer by controlling the first to tenth control valves 70A to 70J, and the remaining one heat exchanger may be used as a economizer and a superheater, or all of the first to third heat exchangers 30, 40, 50 may be used as a superheater, a hot water heater, and an economizer.
In the present invention described above, when the first to third heat exchangers 30, 40, and 50 are used as an economizer, a hot water heater, and a superheater, respectively, the first to sixth control valves 70A to 70F are opened, the seventh to tenth control valves 70G to 70J are closed, the valve 15 provided in the main saturated steam supply pipe 13 is opened or closed, the feedwater stored in the feedwater tank 34 is supplied to the first heat exchanger 30 by driving the feedwater pump 32, the hot water to be heated stored in the hot water storage tank 41 is supplied to the second heat exchanger 40 by driving the circulation pump 43, and the saturated steam generated in the boiler body 11 is supplied to the third heat exchanger 50 through the saturated steam branch pipe 51.
As described above, the feed water, the hot water to be heated, and the saturated steam are supplied to the first to third heat exchangers 30, 40, and 50, respectively, and are heated by the residual heat discharged from the flue 12, the preheated feed water is supplied to the boiler body 11 as irrigation water through the feed water discharge pipe 33, the heated hot water is stored in the hot water storage tank 44 through the hot water discharge pipe 44 and is supplied to a required hot water supply site, and the superheated steam is supplied to a superheated steam use site through the superheated steam conduit 52.
As described above, the first to third heat exchangers 30, 40, and 50 perform the functions of the economizer, the hot water heater, and the superheater, respectively, thereby diversifying the waste heat absorbing function, and thus improving the utilization rate of waste heat.
In the case where the first to third heat exchangers 30, 40, and 50 are used as superheaters, if the third control valve 70C, the sixth, seventh, eighth control valves 70F, 70G, and 70H, and the ninth and tenth control valves 70I and 70J are opened, and the first, second, fourth, and fifth control valves 70A, 70B, 70D, and 70E are closed, the saturated steam generated from the boiler body 11 is supplied to the first to third heat exchangers 30, 40, and 50 through the saturated steam branch pipe 51 and the inflow side connection pipe 60A, heated by the residual heat, and turned into superheated steam, and thereafter, the superheated steam that has been superheated steam in the first and second heat exchangers 30 and 40 is supplied to the superheated steam supply point through the discharge side connection pipe 60B, and the superheated steam generated in the third heat exchanger 50 is supplied to the superheated steam supply point through the superheated steam duct 52.
Furthermore, the second and third heat exchangers 40 and 50 may be used as superheaters and the first heat exchanger 30 may be used as a economizer, or the third heat exchanger 50 may be used as a superheater and the first and second heat exchangers 30 and 40 may be used as hot water heaters.
The first to third heat exchangers 30, 40, and 50 may be used as hot water heaters, the second and third heat exchangers 40 and 50 may be used as hot water heaters, and the first heat exchanger 30 may be used as an economizer.
The first to third heat exchangers 30, 40, and 50 may be used as economizers, the first and second heat exchangers 30 and 40 may be used as economizers, and the third heat exchanger 50 may be used as a superheater.
As described above, the first to tenth control valves 70A to 70J in the case where the first to third heat exchangers 30, 40, and 50 are used as the economizer, the hot water heater, and the superheater, respectively, or two or more heat exchangers are used as the same function are opened and closed as shown in table one.
Watch 1
Valve opening/closing diagram
As described above, by causing two or more heat exchangers to perform the same function, the feed water amount, the hot water amount, or the superheated steam amount is selectively and greatly increased, and when the usage load abruptly changes, for example, when the amount of superheated steam generated from the third heat exchanger 50 does not satisfy the required amount of the load, superheated steam is also generated in the first and second heat exchangers, whereby the amount of superheated steam satisfying the required amount of the required load can be actively supplied, and the utilization efficiency can be increased. Description of the reference symbols
12: flue, 20: heat exchanger group, 30, 40, 50: a first to a third heat exchanger for exchanging heat with the refrigerant,
60A: inflow side connection pipe, 60B: discharge-side connection pipe, 70A to 70J: first to tenth control valves.
Claims (4)
1. A heat recovery device of a steam boiler, comprising:
a heat exchanger group including first, second, and third heat exchangers provided in a flue, a feed water supply pipe connected to an inlet of the first heat exchanger, an outlet connected to a boiler body through a feed water discharge pipe, an inlet and an outlet of the second heat exchanger connected to a hot water storage tank through a hot water supply pipe and a hot water discharge pipe, an inlet of the third heat exchanger connected to a saturated steam branch pipe connected to a main saturated steam supply pipe, and a superheated steam duct connected to an outlet of the third heat exchanger;
an inflow side connection pipe connecting the water supply pipe, the hot water supply pipe, and the saturated steam branch pipe to each other;
a discharge-side connection pipe connecting the feed water discharge pipe, the hot water discharge pipe, and the superheated steam conduit to each other; and
a first control valve arranged on the water supply pipe,
a second control valve provided on the hot water supply pipe,
a third control valve provided on the saturated steam branch pipe,
a seventh control valve provided between the water supply pipe and the hot water supply pipe at the inflow side connection pipe,
an eighth control valve provided between the inflow-side connection pipe and the hot water supply pipe and the saturated steam branch pipe,
a fourth control valve arranged on the feed water discharge pipe,
a fifth control valve provided on the hot water discharge pipe,
a sixth control valve provided on the superheated steam conduit,
a ninth control valve provided between the feed water discharge pipe and the hot water discharge pipe at the discharge side connection pipe,
and a tenth control valve provided between the hot water discharge pipe and the superheated steam guide pipe at the discharge side connection pipe.
2. A heat recovery device of a steam boiler according to claim 1, characterized in that,
the first to third heat exchangers are provided with a plurality of rows of heat exchange tubes between the inlet header and the outlet header.
3. A heat recovery device of a steam boiler according to claim 1, characterized in that,
and a water supply pump is arranged on the water supply pipe.
4. A heat recovery device of a steam boiler according to claim 1, characterized in that,
and a circulating pump is arranged on the hot water supply pipe.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR10-2017-0152898 | 2017-11-16 | ||
| KR1020170152898A KR101842713B1 (en) | 2017-11-16 | 2017-11-16 | Waste heat recovery apparatus of steam boiler |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109798511A CN109798511A (en) | 2019-05-24 |
| CN109798511B true CN109798511B (en) | 2020-03-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811095418.XA Expired - Fee Related CN109798511B (en) | 2017-11-16 | 2018-09-19 | Waste heat recovery device of steam boiler |
Country Status (2)
| Country | Link |
|---|---|
| KR (1) | KR101842713B1 (en) |
| CN (1) | CN109798511B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108800961A (en) * | 2018-06-29 | 2018-11-13 | 天津健威泽节能环保科技股份有限公司 | Kiln cylinder body steam heat-exchanging system and implementation method for the low pressure filling of cement kiln power station |
| CN112013704B (en) * | 2020-09-04 | 2022-06-07 | 沈阳建筑大学 | A high-efficient type waste heat recovery system for steelmaking continuous casting |
| CN112361216A (en) * | 2020-10-26 | 2021-02-12 | 河南中烟工业有限责任公司 | Steam supply system of cigarette throwing workshop |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202902893U (en) * | 2012-10-26 | 2013-04-24 | 福建省文松彩印有限公司 | Smoke waste heat boiler system of rotary hearth furnace |
| CN104390200A (en) * | 2014-11-21 | 2015-03-04 | 张家港格林沙洲锅炉有限公司 | Marine exhaust gas waste heat boiler |
| KR101601667B1 (en) * | 2014-05-23 | 2016-03-09 | 주식회사 동광보일러 | Hot water boiler for heating and bath |
| CN205607171U (en) * | 2016-04-08 | 2016-09-28 | 陆达 | To super pressure -high temperature waste heat power generation system in low temperature flue gas adopts |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101261861B1 (en) * | 2011-02-10 | 2013-05-07 | 삼성중공업 주식회사 | Brown gas generating system using waste heat collecting device of engine |
| KR101476557B1 (en) * | 2013-11-06 | 2015-01-02 | 코오롱글로벌 주식회사 | Heat supply apparatus |
| KR101613228B1 (en) * | 2014-09-15 | 2016-04-18 | 대우조선해양 주식회사 | Waste Heat Recovery Unit for a Ship and Method for Recoverying Waste Heat |
| CN104534539A (en) * | 2015-01-08 | 2015-04-22 | 清华大学 | Gas steam combined cycle central heating device and heating method |
| JP2017187270A (en) * | 2016-04-04 | 2017-10-12 | 徳夫 門脇 | Steam supply device |
-
2017
- 2017-11-16 KR KR1020170152898A patent/KR101842713B1/en active IP Right Grant
-
2018
- 2018-09-19 CN CN201811095418.XA patent/CN109798511B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202902893U (en) * | 2012-10-26 | 2013-04-24 | 福建省文松彩印有限公司 | Smoke waste heat boiler system of rotary hearth furnace |
| KR101601667B1 (en) * | 2014-05-23 | 2016-03-09 | 주식회사 동광보일러 | Hot water boiler for heating and bath |
| CN104390200A (en) * | 2014-11-21 | 2015-03-04 | 张家港格林沙洲锅炉有限公司 | Marine exhaust gas waste heat boiler |
| CN205607171U (en) * | 2016-04-08 | 2016-09-28 | 陆达 | To super pressure -high temperature waste heat power generation system in low temperature flue gas adopts |
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| Publication number | Publication date |
|---|---|
| KR101842713B1 (en) | 2018-03-28 |
| CN109798511A (en) | 2019-05-24 |
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