CN101968216A - System for automatically adjusting temperature of smoke at outlet of waste heat boiler - Google Patents

System for automatically adjusting temperature of smoke at outlet of waste heat boiler Download PDF

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Publication number
CN101968216A
CN101968216A CN 201010513399 CN201010513399A CN101968216A CN 101968216 A CN101968216 A CN 101968216A CN 201010513399 CN201010513399 CN 201010513399 CN 201010513399 A CN201010513399 A CN 201010513399A CN 101968216 A CN101968216 A CN 101968216A
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Prior art keywords
outlet
superheater
steam
gas
boiler
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CN 201010513399
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CN101968216B (en
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赵学明
李炎
饶荣
肖峰
陈叶滔
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Chengdu Hot New Energy Technology Co., Ltd.
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CHENGDU STONE NEW ENERGY TECHNOLOGY Co Ltd
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Abstract

The invention discloses a system for automatically adjusting the temperature of smoke at an outlet of a waste heat boiler by completely utilizing waste heat. In the system, the boiler is provided with a smoke inlet, a smoke outlet, a superheater, a corresponding water inlet and a corresponding steam outlet; the superheater is arranged between the smoke inlet and the smoke outlet; a second superheater, a corresponding second water inlet and a corresponding second steam outlet are arranged at the back of the superheater; the second steam outlet is connected with a steam supply pipeline provided with a reducing valve; low-pressure steam generated by the second superheater can be output to a steam turbine and the like through the steam supply pipeline to generate electricity; a heat requirement sensor is arranged at the back of the smoke outlet; and a control device of the reducing valve is connected with the heat requirement sensor and can adjust the temperature of the waste heat boiler outlet randomly in a certain range according to the change of heat requirements of the system. The system can be applied to various waste heat boilers.

Description

Heat boiler outlet flue-gas temperature automatic regulating system
Technical field
The present invention relates to the automatic adjusting of afterheat boiler system exit gas temperature.
Background technology
At present, New Type Dry-process Cement Production waste heat SP steam generator system is a heating source with the cement kiln tail fume afterheat, boiler is provided with gas approach, exhanst gas outlet, and the superheater between gas approach and exhanst gas outlet and corresponding admission port and steam (vapor) outlet, described superheater is made up of evaporimeter, superheater, drum and economizer.Feedwater enters drum via water inlet, economizer, is sent for the waste heat plant generator by steam (vapor) outlet after evaporimeter, superheater form steam, and the flue gas after the heat exchange is supplied to the raw material system.
There is following drawback in this SP afterheat boiler system: the SP steam generator system can not be regulated the boiler export flue-gas temperature, promptly enable to regulate the boiler export flue-gas temperature, also just utilize economizer, simply control by increasing and reduce boiler heating surface, the method can only be controlled at the boiler export flue-gas temperature on two fixing points; When the raw material system stops transport, can reduce SP boiler export flue-gas temperature and but can not further reduce many recovery waste heats; When the raw material system needed more heats, SP boiler export flue-gas temperature can not improve; SP boiler export flue-gas temperature can not be followed raw material system thermal changes in demand and be changed, and waste heat is not fully utilized.
Summary of the invention
In order to overcome the deficiency that existing heat boiler outlet flue-gas temperature can not make full use of waste heat, technical problem to be solved by this invention provides a kind of heat boiler outlet flue-gas temperature automatic regulating system that can make full use of waste heat.
The technical solution adopted for the present invention to solve the technical problems is: heat boiler outlet flue-gas temperature automatic regulating system, boiler is provided with gas approach, exhanst gas outlet, and the superheater between gas approach, exhanst gas outlet and corresponding admission port and steam (vapor) outlet, have additional second superheater behind the superheater between gas approach and the exhanst gas outlet, second superheater is equipped with corresponding second admission port and second steam (vapor) outlet.
Described second steam (vapor) outlet is connected with the gas filling pipeline that is provided with pressure-reducing valve.
Also be provided with the heat demand sensor behind the described exhanst gas outlet, the control device of described pressure-reducing valve is connected with the heat demand sensor.
Described second superheater is made up of second evaporimeter, second superheater and second drum.
Described superheater is made up of evaporimeter, superheater, drum.
Described superheater also comprises economizer, and described economizer is connected between admission port and the drum.
The invention has the beneficial effects as follows: according to system design parameters, increasing by a cover superheater in waste heat boiler is that second superheater is used for heat absorption, the low-pressure steam that second superheater produces can output to steam turbine etc. by gas filling pipeline and be used for generating, and also be provided with the heat demand sensor behind the exhanst gas outlet, this sensor can be controlled the caloric receptivity of second superheater, thereby can be according to the changes in demand of system to heat, regulate the heat boiler outlet temperature within the specific limits arbitrarily, the present invention may be used on the various waste heat boilers.
Description of drawings
Fig. 1 is the schematic diagram of existing afterheat boiler system.
Fig. 2 is a schematic diagram of the present invention.
Fig. 3 is the schematic diagram of the embodiment of the invention.
Be labeled as 1-boiler, 2-economizer, 3-evaporimeter among the figure, the 4-superheater, 5-drum, 6-second admission port, 7-second drum, 8-second evaporimeter, 9-second superheater, 10-second steam (vapor) outlet, 11-pressure-reducing valve, the 12-gas filling pipeline, 13-admission port, 14-steam (vapor) outlet, 15-gas approach, the 16-exhanst gas outlet, 17-heat demand sensor, 18-raw mill, the 19-steam turbine, 20-superheater, 21-second superheater.
The specific embodiment
The present invention is further described below in conjunction with drawings and Examples.
As shown in Figures 2 and 3, heat boiler outlet flue-gas temperature automatic regulating system of the present invention, boiler 1 is provided with gas approach 15, exhanst gas outlet 16, and the superheater 20 between gas approach 15 and exhanst gas outlet 16 and corresponding admission port 13 and steam (vapor) outlet 14, described superheater 20 is by evaporimeter 3, superheater 4, drum 5 and economizer 2 are formed, feedwater is via admission port 13, economizer 2 enters drum 5, through evaporimeter 3, after forming steam, superheater 4 sends by steam (vapor) outlet 14, the steam of sending generally is used for generating, behind the superheater 20 between gas approach 15 and the exhanst gas outlet 16, be provided with second superheater 21, second superheater 21 sets corresponding second admission port 6 and second steam (vapor) outlet 10, formed low-pressure steam can be made many purposes, also can be used as by steam (vapor) outlet 14 to send replenishing of steam.
Described second steam (vapor) outlet 10 is connected with the gas filling pipeline 12 that is provided with pressure-reducing valve 11.Pressure-reducing valve 11 is used to increase and decrease the resistance of pipeline, controls the operating pressure of second superheater 21, changes the heat transfer temperature difference of boiler smoke and working medium, and the absorption heat of increase and decrease boiler heating surface reaches the purpose of controlling the boiler export exhaust gas temperature.The boiler export exhaust gas temperature can be regulated arbitrarily within the specific limits under this mode.
Also be provided with heat demand sensor 17 behind the described exhanst gas outlet 16, the control device of described pressure-reducing valve 11 is connected with heat demand sensor 17, thereby the boiler export exhaust gas temperature can be regulated according to the heat demand in the residual neat recovering system of waste heat boiler place, thereby utilize waste heat more fully, when the heat demand in the residual neat recovering system is high, turn down or close pressure-reducing valve 11, increase the operating pressure of second superheater 21, reduce heat absorption, exit gas temperature is raise; When the heat demand in the residual neat recovering system is low, but standard-sized sheet pressure-reducing valve 11 reduces the operating pressure of second superheater 21, increases heat absorption, and exit gas temperature is reduced, and fully absorbs the heat that the flue gas that carries out boiler 1 brings.
Usually, described second superheater 21 is made up of second evaporimeter 8, second superheater 9 and second drum 7, and the duty of second superheater 21 or off working state can be controlled by pressure-reducing valve 11 as mentioned above, therefore, can no longer dispose economizer.When increase join second superheater 21 after, the caloric receptivity of whole waste heat boiler can be adjusted within the specific limits, at this moment, whether original superheater part disposes economizer 2 is decided according to other needs of system, if configuration this moment economizer 2, it mainly acts on temperature, the pressure that is to improve steam, but not its adjusting exit gas temperature when being used for former residual neat recovering system.
Embodiment:
Certain new type nonaqueous cement production line kiln tail SP waste heat boiler is used the present invention and is transformed, and kiln tail SP heat boiler outlet flue gas is delivered to the raw mill 18 of raw material system, and its steam is delivered to steam turbine 19 and is used for generating.
As shown in Figure 3, heat boiler outlet flue-gas temperature automatic regulating system of the present invention, boiler 1 is provided with gas approach 15, exhanst gas outlet 16, and the superheater 20 between gas approach 15 and exhanst gas outlet 16 and corresponding admission port 13 and steam (vapor) outlet 14, described superheater 20 is by evaporimeter 3, superheater 4, drum 5 and economizer 2 are formed, feedwater is via admission port 13, economizer 2 enters drum 5, through evaporimeter 3, after forming steam, superheater 4 sends by steam (vapor) outlet 14, steam passes out to steam turbine 19 and is used for generating, second superheater 21 and corresponding second admission port 6 and second steam (vapor) outlet 10 between gas approach 15 and exhanst gas outlet 16, have been set up, described second superheater 21 is by second evaporimeter 8, second superheater 9 and second drum 7 are formed, the feedwater that replenishes heat absorption enters second drum 7 via second admission port 6, through second evaporimeter 8, send by second steam (vapor) outlet 10 after second superheater 9 forms low-pressure steam, be connected with the tonifying Qi pipeline of pressure-reducing valve 11 at second steam (vapor) outlet 10.
The steam design pressure 0.2~0.5MPa of second superheater 21, maximum working (operation) pressure (MWP) 1.6MPa, the steam that is produced are used for absorbing still available fume afterheat behind economizer 2 as the filling steam of steam turbine 19.
Steam behind the pressure-reducing valve 11 enters steam turbine 19 fillings acting, and filling pressure is looked the ruuning situation of steam turbine 19 and regulated automatically, realizes automatic filling, the about 0.1~0.4MPa of filling pressure.Pressure-reducing valve 11 is used to increase and decrease the resistance of pipeline, controls the operating pressure of second superheater 21, thereby reaches the purpose of saturated-steam temperature in control second evaporimeter 8.The regulation and control of saturated-steam temperature can change the heat transfer temperature difference of boiler smoke and working medium in second evaporimeter 8, the absorption heat of increase and decrease boiler heating surface, thereby control boiler export exhaust gas temperature.
When raw mill 18 operations, higher heat demand is arranged, should improve the outlet exhaust gas temperature of boiler 1 this moment, for this reason, heat demand sensor 17 is set, described pressure-reducing valve 11 is connected with heat demand sensor 17, the demand of raw material system thermal can be indirectly reflected by the cigarette temperature that goes out to grind of raw mill 18, described heat demand sensor 17 can be arranged on the smoke outlet of raw mill 18, then can be in conjunction with the ruuning situation of raw material system, control the aperture of pressure-reducing valve 11, the variation of the aperture of pressure-reducing valve 11 can be used mill cigarette temperature conversely and be remained on a certain setting range, this setting range is by the operational factor decision of raw material system, thereby the heat demand that guarantees SP boiler export flue-gas temperature and raw material system is closely connected, and makes fume afterheat be fully used.
Such scheme has solved existing waste heat boiler exhaust gas temperature can not self-regulating problem, realizes the automatic filling of steam turbine 19 simultaneously, reliable.

Claims (6)

1. heat boiler outlet flue-gas temperature automatic regulating system, boiler (1) is provided with gas approach (15), exhanst gas outlet (16), and be positioned at superheater (20) and corresponding admission port (13) and steam (vapor) outlet (14) between gas approach (15) and the exhanst gas outlet (16), it is characterized in that: have additional second superheater (21) behind the superheater (20) between gas approach (15) and the exhanst gas outlet (16), second superheater (21) is equipped with corresponding second admission port (6) and second steam (vapor) outlet (10).
2. heat boiler outlet flue-gas temperature automatic regulating system as claimed in claim 1 is characterized in that: described second steam (vapor) outlet (10) is connected with the gas filling pipeline that is provided with pressure-reducing valve (11) (12).
3. heat boiler outlet flue-gas temperature automatic regulating system as claimed in claim 2 is characterized in that: be provided with heat demand sensor (17) behind the described exhanst gas outlet (16), the control device of described pressure-reducing valve (11) is connected with heat demand sensor (17).
4. as claim 1,2 or 3 described heat boiler outlet flue-gas temperature automatic regulating systems, it is characterized in that: described second superheater (21) is made up of second evaporimeter (8), second superheater (9) and second drum (7).
5. as claim 1,2 or 3 described heat boiler outlet flue-gas temperature automatic regulating systems, it is characterized in that: described superheater (20) is made up of evaporimeter (3), superheater (4), drum (5).
6. heat boiler outlet flue-gas temperature automatic regulating system as claimed in claim 5 is characterized in that: described superheater (20) also comprises economizer (2), and described economizer (2) is connected between admission port (13) and the drum (5).
CN 201010513399 2010-10-20 2010-10-20 System for automatically adjusting temperature of smoke at outlet of waste heat boiler Expired - Fee Related CN101968216B (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103061832A (en) * 2013-01-08 2013-04-24 北京世纪源博科技股份有限公司 Steam power generating system with controllable boiler smoke temperature
CN103244940A (en) * 2013-04-15 2013-08-14 中信重工机械股份有限公司 Medium-temperature medium-pressure double-pressure residual heat boiler with self-deoxidation system
CN103925814A (en) * 2014-04-24 2014-07-16 南京国昌化工科技有限公司 Combined heat exchange system

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB369415A (en) * 1930-04-01 1932-03-24 Gen Carbonalpha Company An improved process for the manufacture of carbon
JPH0650501A (en) * 1992-08-03 1994-02-22 Hitachi Ltd Heat recovery system for incinerator
CN101021305A (en) * 2007-03-20 2007-08-22 盐城市锅炉制造有限公司 Sinter cooler low temperature waste gas residual heat boiler and power generating system thereof
CN101235732A (en) * 2008-03-07 2008-08-06 杭州中能汽轮动力有限公司 Exhaust heat steam turbine air-supplementary regulation system and its control method
CN201354653Y (en) * 2009-01-15 2009-12-02 江苏东能环保能源科技有限公司 Improved sintering residual heat power generating system with by-product gas afterburning
CN101603679A (en) * 2009-07-20 2009-12-16 成都南玻玻璃有限公司 Wen Cizhong presses afterheat boiler system in the float glass smelting kiln
CN201521944U (en) * 2009-07-20 2010-07-07 成都南玻玻璃有限公司 Waste-heat boiler off-gas control apparatus for float glass smelting kiln
CN201827882U (en) * 2010-10-20 2011-05-11 成都四通新能源技术有限公司 Automatic regulating system for smoke temperature at outlet of waste heat boiler

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB369415A (en) * 1930-04-01 1932-03-24 Gen Carbonalpha Company An improved process for the manufacture of carbon
JPH0650501A (en) * 1992-08-03 1994-02-22 Hitachi Ltd Heat recovery system for incinerator
CN101021305A (en) * 2007-03-20 2007-08-22 盐城市锅炉制造有限公司 Sinter cooler low temperature waste gas residual heat boiler and power generating system thereof
CN101235732A (en) * 2008-03-07 2008-08-06 杭州中能汽轮动力有限公司 Exhaust heat steam turbine air-supplementary regulation system and its control method
CN201354653Y (en) * 2009-01-15 2009-12-02 江苏东能环保能源科技有限公司 Improved sintering residual heat power generating system with by-product gas afterburning
CN101603679A (en) * 2009-07-20 2009-12-16 成都南玻玻璃有限公司 Wen Cizhong presses afterheat boiler system in the float glass smelting kiln
CN201521944U (en) * 2009-07-20 2010-07-07 成都南玻玻璃有限公司 Waste-heat boiler off-gas control apparatus for float glass smelting kiln
CN201827882U (en) * 2010-10-20 2011-05-11 成都四通新能源技术有限公司 Automatic regulating system for smoke temperature at outlet of waste heat boiler

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103061832A (en) * 2013-01-08 2013-04-24 北京世纪源博科技股份有限公司 Steam power generating system with controllable boiler smoke temperature
CN103244940A (en) * 2013-04-15 2013-08-14 中信重工机械股份有限公司 Medium-temperature medium-pressure double-pressure residual heat boiler with self-deoxidation system
CN103244940B (en) * 2013-04-15 2015-12-30 中信重工机械股份有限公司 A kind of band is from the two pressure waste heat boiler of the medium temperature and medium pressure of deaerating type of cycles
CN103925814A (en) * 2014-04-24 2014-07-16 南京国昌化工科技有限公司 Combined heat exchange system
CN103925814B (en) * 2014-04-24 2016-09-07 南京国昌化工科技有限公司 A kind of combined type heat-exchange system

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Address after: The people of Wuhou District road Chengdu city Sichuan province 610041 four Branch Road No. 3 National 863 software incubator base in Sichuan on the third floor

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Address after: The people of Wuhou District road Chengdu city Sichuan province 610041 four Branch Road No. 3

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Address before: The people of Wuhou District road Chengdu city Sichuan province 610041 four Branch Road No. 3 National 863 software incubator base in Sichuan on the third floor

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Denomination of invention: System for automatically adjusting temperature of smoke at outlet of waste heat boiler

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