CN101619848A - System and method for recovering waste heat of coke-oven crude gas - Google Patents
System and method for recovering waste heat of coke-oven crude gas Download PDFInfo
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- CN101619848A CN101619848A CN200810122773A CN200810122773A CN101619848A CN 101619848 A CN101619848 A CN 101619848A CN 200810122773 A CN200810122773 A CN 200810122773A CN 200810122773 A CN200810122773 A CN 200810122773A CN 101619848 A CN101619848 A CN 101619848A
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Abstract
The invention relates to waste heat recovery of coke-oven crude gas, in particular to a system and a method for recovering waste heat of coke-oven crude gas, which mainly solves the technique problems of causing water leakage to a water jacket of a riser tube, causing tar slag to the inner wall of the riser tube and causing difficult opening and corrosion of a riser-tube cap by adopting a riser-tube vaporization cooler system to recover the waste heat of gas. The invention adopts a technical scheme that the system for recovering waste heat of coke-oven crude gas mainly comprises a high-end heat energy (800 to 500 DED C) absorption device, a low-end heat energy (500 to 280 DEG C) absorption device and a water replenishment system, wherein the high-end heat energy absorption device is connected with the low-end heat energy absorption device through a two-stage cooling input pipeline. The recovery system is connected with a reservoir through a water inlet pipe, is taken as a new-water replenishment channel of an external entering system, is connected with the high-end heat energy absorption device and the low-end heat energy absorption device for heat exchange via the reservoir through a water replenishment pipe respectively, and finally outputs steam generated in a steam drum through a steam output pipe. The method is mainly used to recover the waste heat of coke-oven crude gas.
Description
Technical field
The present invention relates to waste heat of coke oven crude gas and reclaim particularly a kind of waste heat of coke oven crude gas recovery system and recovery method.
Background technology
In current traditional coking production technology, coal charge produces raw coke oven gas (temperature 850-950 ℃, flow 70000m3/h) when the indoor process of carbonization high-temperature retorting becomes coke, the raw coke oven gas that is pooled to carbonization chamber headroom is being delivered to through cross under in the process of gas purification, raw coke oven gas cools off by the ammoniacal liquor sprinkling in bridge tube, so that raw coke oven gas enters road, back production process.Can reduce high temperature raw coke oven gas temperature rapidly though adopt ammoniacal liquor to spray the mode that raw coke oven gas is cooled off, but this technological process more complicated, energy consumption are big, operation and maintenance cost is higher, simultaneously a large amount of heat energy that contained in the raw coke oven gas with the ammoniacal liquor heat exchanging process in the ammoniacal liquor that is cooled take away, cooled ammoniacal liquor then discharges by the evaporation deamination, when consuming a large amount of ammoniacal liquor increase production costs, the raw coke oven gas residual heat resources can't reclaim and lose.
Its shortcoming that mainly exists has: 1, system energy consumption height; 2, production cost is big; 3, efficiency of energy utilization is low.
Introduce the sprinkling heavy tar recovery raw coke oven gas sensible heat of Japanese proposition and the Sa Musi-700 that uses of Nagoya factory of company of Nippon Steel test in [the metallurgical energy] 4 volumes 3 phases " the high efficiente callback new method of coke oven coke oven uprising tube gas heat " and reclaimed the raw coke oven gas sensible heat.
Introduced the Ascension Pipe Gasification chiller system in [combustion gas and heating power] the 15th volume the 5th phase " analysis of Ascension Pipe Gasification cooler energy-saving benefit ", be called for short the SQ system, China beginning of the seventies uses on the single discharge coke oven in 71 holes, 65 holes of first guiding principle, Taiyuan Iron and Steel Co. first, later in Beijing, coke-oven plants such as Wuhan Iron and Steel Plant, Anshan iron and steel plant and Ma Gang use in succession.Main existing problems: safe operation problem, tedge water leg seepy question, tedge inwall coking dregs of fat problem, tedge lid are taken off and are opened difficult problem and etching problem.
Chinese patent application number: 200610020411.2 disclose " a kind of method by separating tar in the ammonia water by cooling coal oven dithio-gas ", it is a kind of method by separating tar in the ammonia water by cooling coal oven dithio-gas, step comprises: the mixed air that ammonia spray is cooled off ammoniacal liquor that raw coke oven gas forms and raw coke oven gas goes out the mixed liquor of tar and ammoniacal liquor by gas-liquid separator separates, this mixed liquor is sent into dish piece type three-phase centrifuge, utilize the difference in specific gravity between ammoniacal liquor, tar and the tar slag and the centrifugation principle of centrifuge, finish the quick of ammoniacal liquor, tar and tar slag and separate.Isolated ammoniacal liquor enters the cyclic ammonia water groove through the return duct gravity flow, is used for circulated sprinkling cooling raw coke oven gas.Adopt three-phase centrifuge that ammonia water and tar oil is separated, can accelerate water-oil separating speed greatly, shorten disengaging time, and can cancel the defecator that former separation profit is used.
Chinese patent application number: 200610045878.2 disclose " coal gas-recovering economizing clean coking process ", and its characteristics are to comprise following technical process: the coking coal coke oven of packing into, and coke oven adopts heat-accumulating burner, makes the waste gas of combustion chamber exhaust temperature less than 150 ℃; The raw coke oven gas that coking produces in hot down direct oxygenation burning, produces high-temperature flue gas without cooling, and pump drainage produces regeneration coal gas to gas generator again, and regeneration coal gas is sent into gas tank and stored utilization after dust pelletizing system; The red heat coke that coke oven the is produced dolly of packing into is sent into cooling tower continuously, is blown into room temperature nitrogen in the cooling tower bottom, and the coke temperature is dropped to below 200 ℃, and coke prolongs conveyer belt from the cooling tower bottom and delivers to the coke stock ground or directly send into blast furnace; The quenching waste gas that reaches more than 600 ℃ of the temperature that the cooling tower top is discharged is collected for UTILIZATION OF VESIDUAL HEAT IN at last.The present invention has eliminated the waste water that produces in the coal oven dithio-gas product removal process, and the investment of pollutant, minimizing necessity etc. produce the high hydrogen content regeneration of high-quality high heating value coal gas, are about 50% of equal scale coke ovens.
The various raw coke oven gas cooling exhaust heat recovering methods of more than introducing all do not relate to the method for heat pipe heat exchanging, and the method that adopts built-in heat pipe separate type recovery waste heat at the rising pipeline section also beyond example.
Summary of the invention
The purpose of this invention is to provide a kind of waste heat of coke oven crude gas recovery system and recovery method, solve to adopt mainly that the Ascension Pipe Gasification chiller system reclaims that the tedge water leg that the coal gas waste heat exists leaks, the tedge inwall coking dregs of fat, tedge lid take off the technical problem that opens difficulty and corrosion.The present invention mainly is in the raw coke oven gas cooling procedure in the coke oven production technology, utilizes the efficient conduction technique of heat pipe, solves the technical problem of raw coke oven gas waste heat recovery.Technical scheme of the present invention is: a kind of waste heat of coke oven crude gas recovery system, mainly be made up of high-end heat energy (800 ℃～500 ℃) absorption plant, low side heat energy (500 ℃～280 ℃) absorption plant and water charging system, high-end absorption installation of heat energy is connected with the low side absorption installation of heat energy by secondary cooling intake line.Recovery system connects cistern by water inlet pipe, enter the additional new water channel road of system as the outside, be connected with high and low end secondary heat sink respectively by filling pipe through cistern then and carry out heat exchange, the steam that produces in drum at last is through steam efferent duct output steam.
High-end absorption installation of heat energy comprises that tedge raw coke oven gas waste-heat recovery device inwall is fixed with separate heat pipe, be connected with release end of heat heat pipe in the drum by the vapor uptake road, form high-end thermal energy transfer structure, connect drum and retracting device by steam condensation down-comer then and form steam and be condensed into the structure of sending back to behind the water.Cistern connects drum by filling pipe through power feed pump, drum inlet pipeline, constitutes the moisturizing structure of drum.
The low side absorption installation of heat energy comprises the built-in endothermic tube of the follow-up multi-stage condensing device of raw coke oven gas, be connected with cistern by multi-stage condensing device outlet pipeline, form low side thermal energy transfer structure, be connected multi-stage condensing device through the power feed pump with multi-stage condensing device inlet pipeline by filling pipe by cistern then, constitute multi-stage condensing device moisturizing structure.
The present invention reclaims waste heat of coke oven crude gas by using separate heat pipe technology and time condensation technology, reaches the purpose that reclaims the raw coke oven gas waste heat and produce steam.
Recovery method comprises high-end energy recovery step and low side energy recovery step, described high-end energy recovery step: introduce tedge raw coke oven gas waste-heat recovery device by the raw coke oven gas inlet tube from the raw coke oven gas that carbonization chamber comes out, restrain by the heating end that radiation heat transfer is passed to separate heat pipe with heat, temperature is reduced to about 500 ℃; After heating end was restrained and absorbed radiant heat, the water in the pipe flashed to steam and sends into the release end of heat heat pipe that is arranged in the drum by the vapor uptake road, with heating of the water in the drum and generation steam, exported by the steam efferent duct; The steam of release end of heat heat pipe leads to heating end tube bank continuing the to be subjected to thermal evaporation that steam condensation down-comer returns to separate heat pipe after being condensed into water, and circulation is carried out and so forth, thereby finishes heat by the conveying of heating section to heat release section.
Described low side energy recovery step: be cooled to 500 ℃ raw coke oven gas and leave tedge raw coke oven gas waste-heat recovery device and enter drum supplementary feed in the follow-up multi-stage condensing device preheating cistern through secondary cooling intake line, reach the effect that makes full use of the raw coke oven gas exhaust temperature, the raw coke oven gas that is cooled to below 280 ℃ the raw coke oven gas loop enters gas gathering manifold by the raw coke oven gas air-introduced machine at last after the secondary cooling, realized the secondary recovery utilization of heat.
Beneficial effect of the present invention: realized the abundant recovering effect of energy, and changed in the former technology state, reached the purpose of energy-saving and environmental protection to energy loss in the raw coke oven gas temperature-fall period and cooling dielectric loss.It is abundant that the present invention reclaims calorific value, and the efficient height is effective.Separate heat pipe heat recovery technology has 1, high heat transfer property; 2, high-transmission heat ability under the low temperature difference; 3, finization is with augmentation of heat transfer; 4, single tube operation; 5, thermal source divides remittance, heat exchange to avoid characteristics such as dew point, realizes the application in the raw coke oven gas cooling waste heat recovery in coke oven coke oven uprising tube, has stronger promotional value.
Description of drawings
Fig. 1: be structural representation of the present invention
Among the figure: 1-tedge raw coke oven gas waste-heat recovery device, 2-multi-stage condensing device, 3-drum, the 4-cistern, 5-raw coke oven gas air-introduced machine, 6-feed pump II, 7-feed pump I, 8-separate heat pipe, 9-release end of heat heat pipe, the 10-endothermic tube, 11-raw coke oven gas inlet tube, raw coke oven gas loop, 12-cooling back, 13-secondary cooling intake line, raw coke oven gas loop, 14-secondary cooling back, 15-steam condensation down-comer, 16-vapor uptake road, 17-multi-stage condensing device outlet pipeline, 18-multi-stage condensing device inlet pipeline, 19-drum liquid level control piper, 20-drum inlet pipeline, 21-filling pipe II, 22-filling pipe I, the 23-water inlet pipe, the 24-steam output pipe.
The specific embodiment
With reference to Fig. 1, the waste heat of coke oven crude gas recovery system mainly is made up of high-end heat energy (800 ℃～500 ℃) low side heat energy (500 ℃～280 ℃) sponge oil unit and water charging system.The recovery system structure connects cistern 4 by water pipe 23, enter the additional new water channel road of system as the outside, be connected with high and low end secondary heat sink respectively by filling pipe I 22, filling pipe II 21 through cistern 4 then and carry out heat exchange, the last steam that produces in drum 3 is through steam output pipe 24 output steam.
High-end absorption installation of heat energy mainly is fixed with separate heat pipe 8 by tedge raw coke oven gas waste-heat recovery device 1 inwall, be connected by the release end of heat heat pipe 9 in vapor uptake road 16 and the drum 3, form high-end thermal energy transfer structure, connect drums and retracting device by steam condensation down-comer 15 then and form steam and be condensed into the structure of sending back to behind the water.Cistern 4 connects drum 3 by filling pipe through power feed pump I 7, drum inlet pipeline 20, constitutes the moisturizing structure of drum.
The low side absorption installation of heat energy is mainly by the built-in endothermic tube 10 of the follow-up multi-stage condensing device of raw coke oven gas 2, be connected with cistern by multi-stage condensing device outlet pipeline 17, form low side thermal energy transfer structure, be connected multi-stage condensing device through power feed pump II 6 with multi-stage condensing device inlet pipeline 18 by filling pipe by cistern then, constitute multi-stage condensing device moisturizing structure.
Separate heat pipe raw coke oven gas waste heat recovery flow process:
Raw coke oven gas processing route: about 800 ℃ the raw coke oven gas that comes out from carbonization chamber, introduce tedge raw coke oven gas waste-heat recovery device 1 by raw coke oven gas inlet tube 11, heat is passed to the heating end tube bank of separate heat pipe 8 by radiation heat transfer, after temperature is reduced to about 500 ℃, raw coke oven gas cools off intake line 13 under the effect of air-introduced machine 5 through secondary, enter follow-up multi-stage condensing device 2 and further carry out heat exchange with the endothermic tube 10 that is arranged in the device, after making that the raw coke oven gas temperature continues to reduce to below 280 ℃, raw coke oven gas loop 14 enters down production process one after the secondary cooling.
Heat exchange path 1: after separate heat pipe 8 tube banks in the tedge raw coke oven gas waste-heat recovery device 1 absorb radiant heat, water in the pipe flashes to steam, by vapor uptake road 16 the release end of heat heat pipes 9 that are arranged in the drum 3 are sent in the rising of carbonated drink mixture and carried out heat exchange, the steam in the tube bank returns to separate heat pipe 8 tube bank continuation heat absorption evaporations by steam condensation down-comer 15 after being condensed into water.Raw coke oven gas through 1 cooling of tedge raw coke oven gas waste-heat recovery device is exported by raw coke oven gas loop after cooling off 12.Drum 3 is provided with drum liquid level control piper 19 and is connected with drum inlet pipeline 20 by control valve.
Heat exchange path 2: after the follow-up multi-stage condensing device 2 interior heat pipes 10 of raw coke oven gas absorbed radiant heat, the water in the pipe was heated into high-temperature water, delivers to cistern 4 again and replenishes preheating water supply as drum.
Heat exchange path 3: external refrigeration water enters after the preheating water that adds excess temperature with follow-up multi-stage condensing device in the cistern 4 mixes through water inlet pipe 23, sends into drum 3 through drum inlet pipeline 20 through filling pipe I 22 under the effect of feed pump I 7, as the supplementing water of drum; Another road is delivered to multi-stage condensing device 2 through filling pipe II 21 by feed pump II 6, as the supplementing water of follow-up multi-stage condensing device 2 heat absorbing end.
Steam generates and outgoing route: be passed to the heat energy of drum 3, heating of the water in the drum and generation steam are exported by steam output pipe 24.
Circulation is carried out and so forth, thereby finishes heat by the conveying of heating section to heat release section, reaches to reclaim the raw coke oven gas sensible heat and produce the purpose that steam uses for the user.
Claims (5)
1, a kind of waste heat of coke oven crude gas recovery system, it is characterized in that forming by high-end absorption installation of heat energy, low side absorption installation of heat energy and water charging system, high-end absorption installation of heat energy is connected with the low side absorption installation of heat energy by secondary cooling intake line, the water inlet pipe of water charging system connects cistern, and cistern is connected with high and low end secondary heat sink respectively by filling pipe.
2, a kind of waste heat of coke oven crude gas recovery system according to claim 1, the tedge raw coke oven gas waste-heat recovery device inwall that it is characterized in that described high-end absorption installation of heat energy is fixed with separate heat pipe, be connected with release end of heat heat pipe in the drum by the vapor uptake road, connecting drum and retracting device by steam condensation down-comer forms steam and is condensed into the structure of sending back to behind the water, cistern connects drum by filling pipe through power feed pump, drum inlet pipeline, constitutes the moisturizing structure of drum.
3, a kind of waste heat of coke oven crude gas recovery system according to claim 2 is characterized in that drum is provided with drum liquid level control piper and is connected with the drum inlet pipeline by control valve.
4, a kind of waste heat of coke oven crude gas recovery system according to claim 1, the built-in endothermic tube of the follow-up multi-stage condensing device of raw coke oven gas that it is characterized in that described low side absorption installation of heat energy, be connected with cistern by multi-stage condensing device outlet pipeline, cistern is connected multi-stage condensing device through the power feed pump with multi-stage condensing device inlet pipeline by filling pipe, constitutes multi-stage condensing device moisturizing structure.
5, the recovery method of the described a kind of waste heat of coke oven crude gas recovery system of claim 1 is characterized in that comprising high-end energy recovery step and low side energy recovery step,
Described high-end energy recovery step: introduce tedge raw coke oven gas waste-heat recovery device from the raw coke oven gas that carbonization chamber comes out by the raw coke oven gas inlet tube, restrain by the heating end that radiation heat transfer is passed to separate heat pipe with heat, temperature is reduced to 500 ℃; After heating end was restrained and absorbed radiant heat, the water in the pipe flashed to steam and sends into the release end of heat heat pipe that is arranged in the drum by the vapor uptake road, with heating of the water in the drum and generation steam, exported by the steam efferent duct; The steam of release end of heat heat pipe leads to heating end tube bank continuing the to be subjected to thermal evaporation that steam condensation down-comer returns to separate heat pipe after being condensed into water, and circulation is carried out and so forth;
Described low side energy recovery step: be cooled to 500 ℃ raw coke oven gas and leave tedge raw coke oven gas waste-heat recovery device and enter drum supplementary feed in the follow-up multi-stage condensing device preheating cistern through secondary cooling intake line, the raw coke oven gas that is cooled to below 280 ℃ the raw coke oven gas loop enters gas gathering manifold by the raw coke oven gas air-introduced machine at last after the secondary cooling.
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| CN106918029A (en) * | 2017-04-13 | 2017-07-04 | 上海宝钢节能环保技术有限公司 | A kind of coking energy coupling optimization and pollutant collaboration governing system and its method |
| CN111849564A (en) * | 2019-04-25 | 2020-10-30 | 北京凯德恒源科技发展有限公司 | Deep recovery method of coke oven crude gas heat energy |
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