CN202203927U - Economizer with energy-saving circulation system - Google Patents

Economizer with energy-saving circulation system Download PDF

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Publication number
CN202203927U
CN202203927U CN2011202792539U CN201120279253U CN202203927U CN 202203927 U CN202203927 U CN 202203927U CN 2011202792539 U CN2011202792539 U CN 2011202792539U CN 201120279253 U CN201120279253 U CN 201120279253U CN 202203927 U CN202203927 U CN 202203927U
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CN
China
Prior art keywords
economizer
regulating valve
temperature
steam turbine
control valve
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Expired - Fee Related
Application number
CN2011202792539U
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Chinese (zh)
Inventor
潘道雨
顾永华
刘汉顺
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
YANCHENG JINFENG ENERGY-SAVING ENVIRONMENTAL PROTECTION EQUIPMENT Co Ltd
Original Assignee
YANCHENG JINFENG ENERGY-SAVING ENVIRONMENTAL PROTECTION EQUIPMENT Co Ltd
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Priority to CN2011202792539U priority Critical patent/CN202203927U/en
Application granted granted Critical
Publication of CN202203927U publication Critical patent/CN202203927U/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Abstract

The utility model discloses an economizer with an energy-saving circulation system, and relates to the technical field of industrial energy saving. The economizer comprises a low-temperature feed water regulating valve, a high-temperature feed water regulating valve, a first thermal resistor, a pipeline booster pump, a second thermal resistor, an economizer body, a recirculation loop regulating valve and a steam turbine regenerative system, wherein the low-temperature feed water regulating valve and the high-temperature feed water regulating valve are connected with the steam turbine regenerative system, the recirculation loop regulating valve and the first thermal resistor respectively; the first thermal resistor is connected with the pipeline booster pump; the pipeline booster pump is connected with the economizer body; the second thermal resistor is arranged on the economizer body; and the economizer body is connected with the recirculation loop regulating valve and the steam turbine regenerative system. By the economizer, fume temperature at an outlet is controlled by changing the rotating speed of the pipeline booster pump, and the afterheat of gas fume is fully utilized under the condition of ensuring safe running, so that the aim of deeply saving energy is fulfilled.

Description

The economizer that has energy saving circulating system
Technical field:
The utility model relates to the industrial energy saving technical field, is specifically related to have the economizer of energy saving circulating system.
Background technology:
Energy crisis is serious day by day along with industrial expansion, causes energy prices constantly to raise, and power plant has higher requirement to energy-saving and cost-reducing, and making full use of fume afterheat becomes energy-conservation effective way.Economizer has its unique advantage as a kind of flue gas waste heat recovery apparatus, and economizer utilizes main condensate to absorb fume afterheat, not only realizes the used heat utilization, and can reduce flue-gas temperature, and then reduce the desulphurization system water column greatly.Reduce the blower fan power consumption, energy conservation and consumption reduction effects is obvious, because this device is installed on boiler back end ductwork; Flue-gas temperature is lower, and cold end corrosion and dust stratification become the major obstacle of its popularization, for solving the cold end corrosion problem; Should strictly control the economizer cold junction temperature, he is higher than flue gas acid dew point.Particularly in the waste-heat recovery device of deeply reducing exhausted smoke temperature, temperature control should be strict more.Wherein said cold junction refers to the smoke outlet of economizer.Existing waste-heat recovery device all fails to address this problem, and has had a strong impact on the safe and reliable operation of economizer.
The utility model content:
The purpose of the utility model provides the economizer that has energy saving circulating system; The automatic control of its wall temperature and exhaust gas temperature, under the prerequisite that guarantees the security of system reliability service, the degree of depth reduces the exhaust gas temperature of boiler; Utilize and change the temperature control of pipe pressurizing revolution speed realization outlet cigarette; Under the situation of operation that ensures safety, make full use of fume afterheat, reach degree of depth purpose of energy saving.
In order to solve the existing problem of background technology; The utility model is taked following technical scheme: it comprises low temperature feed-regulating valve 1, high temperature water-supply control valve 2, first thermal resistance 3, pipe pressurizing pump 4, second thermal resistance 5, economizer body 6, recirculation circuit control valve 7 and steam turbine heat regenerative system 8; Low temperature feed-regulating valve 1, high temperature water-supply control valve 2 are connected with steam turbine heat regenerative system 8, recirculation circuit control valve 7 and first thermal resistance 3 respectively; First thermal resistance 3 is connected with pipe pressurizing pump 4; Pipe pressurizing pump 4 is connected with economizer body 6; And economizer body 6 is provided with second thermal resistance 5, and economizer body 6 is connected with steam turbine heat regenerative system 8 with recirculation circuit control valve 7 respectively.
The utlity model has following beneficial effect: the automatic control of its wall temperature and exhaust gas temperature; Under the prerequisite that guarantees the security of system reliability service; The degree of depth reduces the exhaust gas temperature of boiler, utilizes to change the temperature control of pipe pressurizing revolution speed realization outlet cigarette, under the situation of operation that ensures safety; Make full use of fume afterheat, reach degree of depth purpose of energy saving.
Description of drawings:
Fig. 1 is the structural representation of the utility model.
The specific embodiment:
With reference to Fig. 1; This specific embodiment is taked following technical scheme: it comprises low temperature feed-regulating valve 1, high temperature water-supply control valve 2, first thermal resistance 3, pipe pressurizing pump 4, second thermal resistance 5, economizer body 6, recirculation circuit control valve 7 and steam turbine heat regenerative system 8; Low temperature feed-regulating valve 1, high temperature water-supply control valve 2 are connected with steam turbine heat regenerative system 8, recirculation circuit control valve 7 and first thermal resistance 3 respectively; First thermal resistance 3 is connected with pipe pressurizing pump 4; Pipe pressurizing pump 4 is connected with economizer body 6, and economizer body 6 is provided with second thermal resistance 5, and economizer body 6 is connected with steam turbine heat regenerative system 8 with recirculation circuit control valve 7 respectively.
The operation principle of this specific embodiment is: when the boiler unit load changes; Main condensate pipeline water temperature changes; The boiler tail flue gas temperature changes; Aperture through regulating high and low temperature feed-regulating valve and recirculation circuit control valve is controlled economizer water side temperature in the design parameter scope, regulates the exhanst gas outlet temperature through the rotating speed that changes frequency conversion pipeline booster pump and reaches design load, guarantees that the economizer wall surface temperature is higher than the flue gas acid dew point temperature; Realize the efficient operation of desulphurization system, and guarantee the safety of each equipment of back-end ductwork.
When economizer normally moved, high temperature water-supply control valve, low temperature feed-regulating valve all were in normally open, and the recirculation return line automatic regulating valve is in normally off; When unit load reduced, steam turbine side main condensate temperature reduced, and the economizer feed temperature reduces; Carrying out along with heat exchanging process; Heat exchanger metallic walls surface temperature reduces gradually, and thermal resistance is measured the inlet water temperature variation in real time and is delivered to the DCS robot control system(RCS), when temperature is lower than design load; System sends instruction and drives big high temperature water-supply control valve, turns down the low temperature feed-regulating valve; Inlet water temperature is raise, thereby guarantee the metal wall surface temperature in normal range (NR), avoid it to be lower than flue gas acid dew point and cause cold end corrosion.When unit load is very low; High temperature water-supply control valve standard-sized sheet, low temperature feed-regulating valve full cut-off, when inlet water temperature still was lower than design load, system sent instruction unpack and regulates recirculation backwater electric control valve; Utilizing the economizer exit high-temperature water to be back to the porch adding feedwater and mixes with low; Improve inlet water temperature to design load, when guaranteeing unit than underload, wall surface temperature is higher than flue gas acid dew point.
When unit load increases and metallic walls surface temperature when being higher than design load, system sends instruction, opens big low temperature to give control valve, turn down the high temperature water-supply control valve; Avoid because of inlet water temperature too high; Cause working-medium water carburation by evaporation in the heat exchanger, cause heat exchanger tube vibration, booster, the security of harm economizer.
When unit load increased, exhaust gas temperature raise, and the economizer exit flue-gas temperature raises, and the real-time measuring port flue-gas temperature of thermal resistance also is delivered to terminal DCS robot control system(RCS); When exit gas temperature was higher than design load, system sent instruction, regulated frequency conversion booster pump rotating speed; Increase feedwater flow, make exit gas temperature be reduced to design load, realize the high efficiente callback utilization of fume afterheat; Improve the boiler generatine set heat efficiency, reduce desulphurization system water consumption, keep desulphurization system and efficiently move.
Reduce and economizer exit flue-gas temperature when being lower than design load when unit is negative, system sends instruction, turns frequency conversion booster pump rotating speed down, and feedwater flow reduces, and makes flue-gas temperature be increased to design load.Prevent each the equipment generation cold end corrosion of economizer and back-end ductwork.Change the control of inlet water temperature realization heat exchange element wall temperature through regulating each motorized adjustment valve opening; Utilize and change the temperature control of pipe pressurizing revolution speed realization outlet cigarette; Can guarantee to make full use of fume afterheat under the situation of safe operation, receive good energy-conservation consumption reduction effect.
The automatic control of wall temperature of this specific embodiment and exhaust gas temperature; Under the prerequisite that guarantees the security of system reliability service; The degree of depth reduces the exhaust gas temperature of boiler, utilizes to change the temperature control of pipe pressurizing revolution speed realization outlet cigarette, under the situation of operation that ensures safety; Make full use of fume afterheat, reach degree of depth purpose of energy saving.

Claims (1)

1. the economizer that has energy saving circulating system; It is characterized in that it comprises low temperature feed-regulating valve (1), high temperature water-supply control valve (2), first thermal resistance (3), pipe pressurizing pump (4), second thermal resistance (5), economizer body (6), recirculation circuit control valve (7) and steam turbine heat regenerative system (8); Low temperature feed-regulating valve (1), high temperature water-supply control valve (2) are connected with steam turbine heat regenerative system (8), recirculation circuit control valve (7) and first thermal resistance (3) respectively; First thermal resistance (3) is connected with pipe pressurizing pump (4); Pipe pressurizing pump (4) is connected with economizer body (6); And economizer body (6) is provided with second thermal resistance (5), and economizer body (6) is connected with steam turbine heat regenerative system (8) with recirculation circuit control valve (7) respectively.
CN2011202792539U 2011-07-17 2011-07-17 Economizer with energy-saving circulation system Expired - Fee Related CN202203927U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2011202792539U CN202203927U (en) 2011-07-17 2011-07-17 Economizer with energy-saving circulation system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN2011202792539U CN202203927U (en) 2011-07-17 2011-07-17 Economizer with energy-saving circulation system

Publications (1)

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CN202203927U true CN202203927U (en) 2012-04-25

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106461206A (en) * 2014-04-28 2017-02-22 通用电器技术有限公司 System and method for fluid medium preheating
CN108679595A (en) * 2018-06-13 2018-10-19 华润电力(温州)有限公司 A kind of power plant boiler and its air preheater anti-block system
CN114110638A (en) * 2021-11-26 2022-03-01 西安热工研究院有限公司 Automatic regulating system and method for efficient flue gas waste heat utilization of air preheater bypass

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106461206A (en) * 2014-04-28 2017-02-22 通用电器技术有限公司 System and method for fluid medium preheating
CN108679595A (en) * 2018-06-13 2018-10-19 华润电力(温州)有限公司 A kind of power plant boiler and its air preheater anti-block system
CN108679595B (en) * 2018-06-13 2024-02-27 华润电力(温州)有限公司 Boiler of thermal power plant and air heater anti-blocking system thereof
CN114110638A (en) * 2021-11-26 2022-03-01 西安热工研究院有限公司 Automatic regulating system and method for efficient flue gas waste heat utilization of air preheater bypass
CN114110638B (en) * 2021-11-26 2024-01-19 西安热工研究院有限公司 Automatic regulating system and method for efficient flue gas waste heat utilization of bypass of air preheater

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C14 Grant of patent or utility model
GR01 Patent grant
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20120425

Termination date: 20160717

CF01 Termination of patent right due to non-payment of annual fee