CN102425976B - Automatic temperature regulating method of high-temperature flue gas for metal heat exchanger - Google Patents
Automatic temperature regulating method of high-temperature flue gas for metal heat exchanger Download PDFInfo
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- CN102425976B CN102425976B CN2011104221071A CN201110422107A CN102425976B CN 102425976 B CN102425976 B CN 102425976B CN 2011104221071 A CN2011104221071 A CN 2011104221071A CN 201110422107 A CN201110422107 A CN 201110422107A CN 102425976 B CN102425976 B CN 102425976B
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Abstract
The invention relates to an automatic temperature regulating method of high-temperature flue gas for metal heat exchanger. The automatic temperature regulating method is applied to kilns in the industries of metallurgy, petrifaction, building materials and the like. According to the automatic temperature regulating method disclosed by the invention, a cooling medium is supplied by a cooling medium supplying unit; and the flow of the cooling medium added into the exchanger is automatically controlled by a logic control unit, so that the temperature of flue gas in the heat exchanger meets the requirement of inlet temperature. Compared with the prior art, the automatic temperature regulating method disclosed by the invention has the advantages that: under the condition of not changing traditional equipment, the temperature of waste gas at an inlet of the heat exchanger can be automatically regulated, the requirement of the metal exchanger on the temperature of gas at the inlet is met, the safe operation of the equipment is ensured and the service life of the equipment is prolonged.
Description
Technical field
The present invention relates to the flue gas automatic temperature regulating method of the metallic recuperator of the recovery high-temperature flue gas waste heat that the industry kilns such as metallurgy, petrochemical industry, building materials use.
Background technology
Be used for to reclaim the high-temperature flue gas waste heat that kiln discharges metallic recuperator since small investment, compact equipment, the advantage such as occupation of land is little, maintenance is few be widely used in industries such as metallurgy, petrochemical industry, building materials.But metallic recuperator has certain restriction to the temperature of entrance high-temperature flue gas, and general temperature can not be above 800 ℃.Otherwise, the service life that can reduce metallic recuperator.Severe patient more, the heat resisting steel of heat exchanger are under the effect that is subject to high temperature, and intensity greatly reduces and causes heat exchanger and deform, or the excessive phenomenon such as local weld cracking that causes of stress, have a strong impact on to produce and the safe operation of equipment.
Summary of the invention
The purpose of this invention is to provide a kind of high-temperature flue gas automatic temperature regulating method for metallic recuperator, the method is in the situation that does not change existing equipment, can realize automatically regulating the EGT of heat exchanger entrance, satisfy metallic recuperator to the requirement of porch gas temperature, the safe operation of assurance equipment, the service life of improving equipment.
For achieving the above object, the present invention adopts following technical scheme to realize:
A kind of high-temperature flue gas automatic temperature regulating method for metallic recuperator, the method feeds cooling medium by the cooling medium feed unit, and automatically control the cooling medium consumption that adds heat exchanger inside by logic control element, so that the flue-gas temperature that enters in the heat exchanger satisfies the inlet temperature requirement; Specifically may further comprise the steps:
1) related device comprises temperature detecting unit, logic control element, cooling medium feed unit, flow automatic control unit, automatic temperature-control body;
2) described temperature detecting unit is used for detecting the gas outlet temperature after high-temperature flue gas entry temperature and the heat exchange;
3) described logic control element reaches the rule of thumb cooling medium addition of data in advance setting according to the high-temperature flue gas entry temperature of temperature detecting unit detection, and the aperture of automatic regulating valve when calculating the equipment initial launch is carried out temperature and just regulated;
4) gas outlet temperature after the heat exchange that detects according to temperature detecting unit of described logic control element, this temperature and the entrance operating temperature that the heat exchanger that presets can bear are compared, automatic regulating valve aperture after the first adjusting is adjusted automatically, automatically controlled the cooling medium consumption that enters heat exchanger; Realize the flue-gas temperature that automatically control enters metallic recuperator inside.
Carry the pipe outlet of cooling medium that atomizer is installed in the described automatic temperature-control body, according to the size and the pressure cooling medium that connect heat exchanger entrance waste gas caliber, corresponding atomizer is installed, when guaranteeing that high-temperature flue gas is flowed through automatic temperature-regulator with cooling medium evenly, stably mix rapidly cooling.
Compared with prior art, advantage of the present invention is:
Solved the problem of metal current heat exchanger to the hot-gas temperature restriction, guaranteed that heat exchanger works under specified serviceability temperature; Prolong heat exchanger service life, simple in structure, compact, safe and reliable, need not regular maintenance, can under any hot conditions, use.
Description of drawings
Fig. 1 is schematic diagram of the present invention;
Fig. 2 is main TV structure figure of the present invention;
Fig. 3 is plan structure figure of the present invention.
Among the figure: 1-cooling medium feed unit 2-automatic regulating valve 3-flow automatic control unit 4-automatic temperature-control body 5-atomizer 6-entrance temperature thermocouple 7-outlet temperature thermocouple 8-metallic recuperator 9-temperature detecting unit 10-logic control element
The specific embodiment
Below in conjunction with accompanying drawing the specific embodiment of the present invention is described further:
See Fig. 1～Fig. 3, a kind of high-temperature flue gas automatic temperature-regulator for metallic recuperator comprises cooling medium feed unit 1, flow automatic control unit 3, automatic temperature-control body 4, atomizer 5, temperature detecting unit 9 and logic control element 10.Cooling medium feed unit 1 is used for the liquid state such as demineralized water, compressed air or gaseous cooling medium are sent into metallic recuperator inside by conveyance conduit; Flow automatic control unit 3 is used for detecting and automatically controlling the feed flow of cooling medium; Temperature detecting unit 9 comprises entrance temperature thermocouple 6 and outlet temperature thermocouple 7, is used for respectively detecting the gas outlet temperature after high-temperature flue gas entry temperature and the heat exchange.
The high-temperature flue gas entry temperature that logic control element 10 detects according to temperature detecting unit and the entrance operating temperature that can bear according to the heat exchanger that presets and the empirical datas such as ability of heat exchanger preset the cooling medium addition, the aperture of automatic regulating valve when calculating the equipment initial launch is carried out temperature and is just regulated; Logic control element is again according to gas outlet temperature after the heat exchange of temperature detecting unit detection, this temperature and the entrance operating temperature that the heat exchanger that presets can bear are compared, automatic regulating valve aperture after the first adjusting is adjusted automatically, realized the flue-gas temperature that automatically control enters metallic recuperator inside.
Pipe outlet at automatic temperature-control body 4 interior conveying cooling mediums is equipped with atomizer 5, according to the size and the pressure cooling medium that connect heat exchanger entrance waste gas caliber, corresponding atomizer is installed, when guaranteeing that high-temperature flue gas is flowed through automatic temperature-regulator with cooling medium evenly, stably mix rapidly cooling.
Cooling medium feed unit 1 sprays into cooling medium in the automatic temperature-control body 4 through automatic regulating valve 2, atomizer 5 by pipeline, on whole entrance cross-section, atomizing rapidly under the effect of atomizer 5 at automatic temperature-control body 4 interior cooling mediums, and with high-temperature flue gas rapid mixing, the cooling of process, the temperature that the temperature stabilization of high-temperature flue gas is set at the metallic recuperator entrance.
Can adopt different cooling mediums according to the characteristic of flue gas system and requirement etc.:
1) if EGT and heat exchanger entrance require differ less, the ability of smoke evacuation system has can adopt the gaseous cooling medium cooling in the situation more than needed.
2) if the temperature that EGT and heat exchanger entrance require differs greatly, can adopt the liquid cooling medium cooling in the limited situation of the surplus capacity of smoke evacuation system.Mainly be to utilize liquid medium in the character of carrying out to absorb when states of matter changes (gasification) a large amount of heats, can reduce to greatest extent like this consumption of cooling medium, reduce the load of smoke evacuation system.
Claims (2)
1. high-temperature flue gas automatic temperature regulating method that is used for metallic recuperator, it is characterized in that, the method feeds cooling medium by the cooling medium feed unit, and automatically control the cooling medium consumption that adds heat exchanger inside by logic control element, so that the flue-gas temperature that enters in the heat exchanger satisfies the inlet temperature requirement; Specifically may further comprise the steps:
1) related device comprises temperature detecting unit, logic control element, cooling medium feed unit, flow automatic control unit, automatic temperature-control body;
2) described temperature detecting unit is used for detecting the gas outlet temperature after heat exchanger high-temperature flue gas entry temperature and the heat exchange;
3) described logic control element reaches the rule of thumb cooling medium addition of data in advance setting according to the high-temperature flue gas entry temperature of temperature detecting unit detection, and the aperture of automatic regulating valve when calculating the equipment initial launch is carried out temperature and just regulated;
4) gas outlet temperature after the heat exchange that detects according to temperature detecting unit of described logic control element, this temperature and the entrance operating temperature that the heat exchanger that presets can bear are compared, automatic regulating valve aperture after the first adjusting is adjusted automatically, automatically controlled the cooling medium consumption that enters heat exchanger; Realize the flue-gas temperature that automatically control enters metallic recuperator inside.
2. a kind of high-temperature flue gas automatic temperature regulating method for metallic recuperator according to claim 1 is characterized in that, carries the pipe outlet of cooling medium that atomizer is installed in the described automatic temperature-control body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011104221071A CN102425976B (en) | 2011-12-15 | 2011-12-15 | Automatic temperature regulating method of high-temperature flue gas for metal heat exchanger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011104221071A CN102425976B (en) | 2011-12-15 | 2011-12-15 | Automatic temperature regulating method of high-temperature flue gas for metal heat exchanger |
Publications (2)
| Publication Number | Publication Date |
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| CN102425976A CN102425976A (en) | 2012-04-25 |
| CN102425976B true CN102425976B (en) | 2013-04-10 |
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| CN2011104221071A Active CN102425976B (en) | 2011-12-15 | 2011-12-15 | Automatic temperature regulating method of high-temperature flue gas for metal heat exchanger |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI557232B (en) * | 2014-12-24 | 2016-11-11 | Pei Yu Wang | Rapid heat transfer steel heat treatment system |
| CN109945732A (en) * | 2019-03-15 | 2019-06-28 | 中国建材国际工程集团有限公司 | Unitized exchanger and its temperature control method |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6233215A (en) * | 1985-08-01 | 1987-02-13 | Mitsubishi Heavy Ind Ltd | Gas heater |
| JPS6438590A (en) * | 1987-08-04 | 1989-02-08 | Toshiba Corp | Heat exchanger |
| CN101624525B (en) * | 2008-07-11 | 2012-10-10 | 中冶焦耐工程技术有限公司 | Cold-side adjustment method for temperature and pressure of high temperature flue gas system of heat recovery coke oven |
| CN102252339B (en) * | 2011-05-12 | 2013-03-27 | 华北电力大学（保定） | System for reducing discharge smoke temperature of power station boiler |
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