CN103063042B - Method for adjusting ISP (imperial smelting process) cooling chute waste heat boiler and power generation system - Google Patents
Method for adjusting ISP (imperial smelting process) cooling chute waste heat boiler and power generation system Download PDFInfo
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- CN103063042B CN103063042B CN201310005911.9A CN201310005911A CN103063042B CN 103063042 B CN103063042 B CN 103063042B CN 201310005911 A CN201310005911 A CN 201310005911A CN 103063042 B CN103063042 B CN 103063042B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
Abstract
The invention relates to a method for adjusting an ISP (imperial smelting process) cooling chute waste heat boiler and a power generation system. The method specifically includes roughly adjusting load of the chute waste heat boiler by controlling the group number of chute heat exchangers, and finely adjusting the load of the chute waste heat boiler by controlling change of pressure of steam manifolds. The method can realize rough adjustment by means of valve control but also can realize fine adjustment by controlling the change of pressure of the steam manifolds, control accuracy is much higher than that of rough heat joint lifting type adjustment, and outlet temperature of meltwater of a lead and zinc chute can be controlled more accurately.
Description
Technical field
The present invention relates to the power-saving technology in lead-zinc smelting technical process, especially in closed blast furnace zinc process (ISP method), plumbous zinc separates control method and the electricity generation system of cooling chute waste heat boiler.
Background technology
Closed blast furnace zinc process is called again ISP method, and it has merged plumbous and two kinds of pyrometallurgical smelting flow processs of zinc, is topmost pyrometallurgy of zinc method in the world at present.After lead and zinc concentrate and flux batching, on sintering machine, bake with agglomeration, agglomerate adds blast furnace together with the process coke of preheating, the temperature that agglomerate is heated directly to ZnO in stove starts reduction, ZnO is reduced and obtains zinc fume, the CO that zinc fume and tuyere area burning produce
2enter lead-splash condenser from furnace roof together with CO gas, zinc fume is arrived the temperature same with plumbous liquid phase by lead splash condensing, and the plumbous liquid of cooling medium is also heated to about 500-530 DEG C by furnace gas, form plumbous zinc fused solution, squeeze into cooling chute with pump, plumbous zinc fused solution is cooled and is water-cooled to 440 DEG C-450 DEG C, then enters and in separating tank, complete Lead separation from zinc.
In ISP technique, plumbous zinc separated cooling chute and drops to the waste heat of the 440 DEG C water that is cooled from 530 DEG C and absorb and enter atmosphere by cooling tower in the past, had not only wasted valuable residual heat resources, and had consumed a lot of recirculated cooling waters for heat radiation, had wasted water resource.
Mitsui metal engineering company releases the cogeneration technology that utilizes the cooling chute of a kind of ISP, by a kind of chute boiler of particular design, these waste heats is reclaimed and supporting power generating equipment with superheated steam form (1.6MPa, 420 DEG C).This chute boiler is made up of protective sleeve, outside low-melting alloy, interior case, inner side low-melting alloy, heat-transfer pipe; heat-transfer pipe is made evaporimeter, the superheater of flap-like; boiler immerses in the fusion of lead zinc solution of cooling chute; carry out heat exchange, hot water becomes superheated steam and delivers to steam turbine and become electric energy.Because within the temperature of the plumbous zinc tap spout of chute must be controlled at 440 DEG C of-450 DEG C of scopes, and production process is changeable, so must be according to need to adjusting the load of chute boiler at any time of producing.The regulative mode that this chute boiler has adopted a kind of hot joint to promote, chute is made up of heat exchanger (evaporimeter, superheater) a group by a group, in the time that plumbous zinc fused solution outlet temperature is too high, drop into again one group of plumbous zinc heat exchanger, by hot joint, chute heat exchanger is immersed in plumbous zinc fused solution.In the time that plumbous zinc fused solution outlet temperature is too low, promote chute heat exchanger by hot joint, reduce heating surface.
This regulative mode, need to promote whole heat exchanger, operation more complicated; Chute boiler itself is exactly that evaporimeter adds superheater, if heat-transfer surface need increase or reduce, the requirement of, control system supporting to whole carbonated drink, regulating system is all higher, and system is huge and complicated; The temperature of superheated steam is higher (420 DEG C) just, so the requirement in exchange heat pipe, hot joint is all higher, adds hot joint and frequently use, and its life-span of hot joint is very short, needs periodic replacement.
Summary of the invention
The problem existing for prior art, the object of the present invention is to provide a kind of ISP cooling chute waste heat boiler control method and electricity generation system, just can regulate fast without hot joint, and degree of regulation improves greatly, and according to the supporting corresponding electricity generation system of the saturated vapor characteristic of this fluctuation.
For achieving the above object, the cooling chute waste heat boiler of a kind of ISP of the present invention control method, be specially: by the input group number realization of controlling chute heat exchanger, chute waste heat boiler load is carried out to coarse adjustment, the variation of controlling drum pressure realizes carries out fine tuning to chute waste heat boiler load.
Further, by the shutoff effect to described chute heat exchanger inlet and outlet valve sets, the group number of controlling input is realized the coarse adjustment of heat exchange amount.
Further, by the adjusting to described drum pressure, thereby regulate evaporating temperature, heat transfer temperature difference, the coefficient of heat transfer, heat exchange amount, realize the fine tuning of whole chute residual heat boiler for exchanging heat amount.
Further, described chute waste heat boiler is provided with evaporating surface, and steam is saturated vapor, and steam pressure is set to low pressure parameter, and rated pressure is 0.8MPa-1.6MPa.
The cooling chute afterheat boiler electricity-generating system of a kind of ISP, comprise drum, some groups of the chute heat exchangers that are arranged side by side, chute waste heat boiler, saturated steam turbine and generators, each chute heat exchanger is all connected with drum by pipeline, on this pipeline, be provided with and control the valve whether chute heat exchanger devotes oneself to work, thereby realize, chute waste heat boiler load is carried out to coarse adjustment; Drum is connected with chute waste heat boiler by pipeline, is provided with drum outlet regulating valve on this pipeline, by regulating the aperture of drum outlet regulating valve, regulates the variation realization of drum pressure to carry out fine tuning to chute waste heat boiler load; Chute waste heat boiler load produces saturated vapor after coarse adjustment and fine tuning, input saturated steam turbine driving electric machine generating output electric energy.
Further, the pipeline that described chute heat exchanger is connected with drum comprises tedge and down-comer, is provided with valve on it.
Further, the feedwater of described chute waste heat boiler is by after oxygen-eliminating device deoxygenation, be transported in described drum by feed pump, and then entered in described chute heat exchanger by forced circulation pump and valve by described down-comer, being heated therein intensification becomes saturation water and turns back in described drum by described tedge, carries out carbonated drink separation in drum.
Further, described chute waste heat boiler produces saturated vapor and is conveyed into described drum, and described drum saturated vapor out enters described saturated steam turbine after main inlet throttle-stop valve, and saturated steam turbine drives described motor generating output electric energy.
Further, exhaust steam after described saturated steam turbine acting passes into condenser and carries out pressurizeing through condensate pump after condensation, squeeze into oxygen-eliminating device by heater again, the condensed water after deoxygenation returns to described chute waste heat boiler after feed pump pressurization, completes whole thermodynamic cycle process.
Further, in described saturated steam turbine, be provided with reheat in stage device.
This valve both can adopt the control mode of valve to realize coarse adjustment, can adopt again the variation of controlling drum pressure to realize fine tuning, and control accuracy is far above the coarse adjustment of hot joint hoisting type, more accurate to the outlet temperature control of plumbous zinc chute fused solution.
Brief description of the drawings
Fig. 1 is system architecture schematic diagram of the present invention;
Fig. 2 is chute heat exchanger structure schematic diagram.
In figure: 1-chute waste heat boiler, 2-saturated steam turbine, 3-drum, 4-main inlet throttle-stop valve, 5-reheat in stage device, 6-generator, 7-condenser, 8-cooling tower, 9-condensate pump, 10-gland heater, 11-oxygen-eliminating device, 12-feed pump, 13-chute heat exchanger, 14-down-comer, 15-tedge, 16-valve, 17-forced circulation pump, 18-drum pressure control valve group.
Detailed description of the invention
Below, with reference to accompanying drawing, the present invention is more fully illustrated, shown in the drawings of exemplary embodiment of the present invention.But the present invention can be presented as multiple multi-form, and should not be construed as the exemplary embodiment that is confined to narrate here.But, these embodiment are provided, thereby make the present invention comprehensively with complete, and scope of the present invention is fully conveyed to those of ordinary skill in the art.
For ease of explanation, here can use such as " on ", the space relative terms such as D score " left side " " right side ", the relation for element shown in key diagram or feature with respect to another element or feature.It should be understood that except the orientation shown in figure, spatial terminology is intended to comprise the different azimuth of device in using or operating.For example, if the device in figure is squeezed, be stated as the element that is positioned at other elements or feature D score will be positioned at other elements or feature " on ".Therefore, exemplary term D score can comprise upper and lower orientation both.Device can otherwise be located (90-degree rotation or be positioned at other orientation), and the relative explanation in space used here can correspondingly be explained.
As shown in Figure 1 and Figure 2, the cooling chute waste heat boiler of a kind of ISP of the present invention control method, be specially: by the input group number realization of controlling chute heat exchanger 13, chute waste heat boiler load is carried out to coarse adjustment, the variation of controlling drum pressure realizes carries out fine tuning to chute waste heat boiler load.By the shutoff effect to described chute heat exchanger inlet and outlet valve sets, the group number of controlling input is realized the coarse adjustment of heat exchange amount.By the adjusting to described drum pressure, thereby regulate evaporating temperature, heat transfer temperature difference, the coefficient of heat transfer, heat exchange amount, realize the fine tuning of whole chute residual heat boiler for exchanging heat amount.Chute waste heat boiler is provided with evaporating surface, and steam is saturated vapor, and steam pressure is set to low pressure parameter, and rated pressure is chosen as required within the scope of 0.8MPa-1.6MPa.
The chilling temperature of plumbous zinc fused solution has requirement in technique, the 100 DEG C of left and right that generally lower the temperature, and outlet temperature is between 440 DEG C～450 DEG C.Can realize the change of heat exchange amount by two kinds of modes, and then control this cooling extent.Coarse adjustment is in a big way determined by the input group number of chute heat exchanger 13, whether 13 parallel connections of each group chute heat exchanger are controlled and are devoted oneself to work by electrically operated valve 16 respectively, change the size of chute boiler heating surface and then adjust the plumbous zinc solution chilling temperature of heat exchange amount control to realize.Fine tuning is more among a small circle determined by the pressure of drum 3, by regulating the aperture of drum outlet regulating valve 18, regulate drum pressure, pressure is toward also increase thereupon of saturated vapor heat transfer coefficient increase heat exchange amount to a high-profile, and pressure reduces heat exchange amount toward low-key saturated vapor heat transfer coefficient and also reduces thereupon.
The cooling chute afterheat boiler electricity-generating system of a kind of ISP of the present invention, comprise drum 3, some groups of the chute heat exchangers 13 that are arranged side by side, chute waste heat boiler 1, saturated steam turbine 2 and generators 6, each chute heat exchanger is all connected with drum by pipeline, on this pipeline, be provided with and control the valve 16 whether chute heat exchanger devotes oneself to work, thereby realize, chute waste heat boiler load is carried out to coarse adjustment; Drum is connected with chute waste heat boiler by pipeline, is provided with drum outlet regulating valve 18 on this pipeline, by regulating the aperture of drum outlet regulating valve 18, regulates the variation realization of drum pressure to carry out fine tuning to chute waste heat boiler load; Chute waste heat boiler load produces saturated vapor after coarse adjustment and fine tuning, input saturated steam turbine driving electric machine 6 generating output electric energy.
The workflow of chute waste heat boiler 1 is as follows: feedwater is by after oxygen-eliminating device 11 deoxygenations, by on feed pump 12 in drum 3, and then entered in chute heat exchanger 13 by forced circulation pump 17 and electrically operated valve 16 by down-comer 14, being heated therein intensification becomes saturation water and turns back in drum 3 by tedge 14, in drum 3, carry out carbonated drink separation, saturated vapor is delivered to steam turbine acting by jet chimney, main inlet throttle-stop valve 4.Its adjusting regulates by two class control valve groups 16 and 18, and degree of regulation can reach 1%.
The chute waste heat boiler 1 being placed in the cooling chute of plumbous zinc produces saturated vapor, drum 3 saturated vapor out enters saturated steam turbine 2 through main inlet throttle-stop valve 4, saturated steam turbine 2 is the dehumidifying multistage impulse turbine of heat again in a machine, and inter-stage is provided with reheat in stage device 5 moist steam expanding is carried out to the steam moisture problem of determining of pyrolysis again.Saturated steam turbine 2 driving electric machine 6 generating output electric energy.Exhaust steam after acting passes into condenser 7 to be carried out after condensate pump 9 pressurizations, squeezing into oxygen-eliminating device 11 by heater 10 after condensation, and the condensed water after deoxygenation returns to chute waste heat boiler 1 after feed pump 12 pressurizations, completes whole thermodynamic cycle process.Along with the aperture of control valve group 18 changes, steam pressure changes, and takes the mode of pressure changeable operation, and the load of saturated steam turbine 2 is also adjusted thereupon.
Steam turbine be have patented technology have inter-stage dehumidify again hot merit can saturated steam turbine (patent No. CN 1687566A), and can regulate at any time initial steam pressure and load according to the steam pressure variation of chute boiler, and be not subject to saturated vapor to expand into the impact of end humidity.
Can contrast the advance of this control method and electricity generation system from following content:
This control method both can adopt the control mode of valve to realize coarse adjustment, can adopt again the variation of controlling drum pressure to realize fine tuning, and control accuracy is far above the coarse adjustment of hot joint hoisting type, more accurate to the outlet temperature control of plumbous zinc chute fused solution.
1. chute boiler has 17 groups of heat exchangers, if adopt coarse adjustment mode, degree of regulation is 1/17(5.8%), this is identical with the degree of regulation of hot joint hoisting type.And adopt the regulative mode of drum pressure, and pressure is increased to 1.1Mpa from 1.0Mpa, and chute fused solution temperature is 530 DEG C, and evaporating temperature is elevated to 184.1 DEG C from 179.9 DEG C, and heat transfer temperature difference is elevated to 345.9 DEG C from 350.1 DEG C, and degree of regulation reaches 1% like this.Visible, high approximately 6 times of the degree of regulation of this mode specific heat joint hoisting type.
2. this control method is without the hot joint that adopts frequent movement, and greatly extend service life.
3. this electricity generation system adopts the saturated steam turbine of supporting sliding pressure operation, and system is simple and reliable.This form is the forms of electricity generation of groping, summing up out in Waste Heat Power Station practice operation experience for many years.
Cogeneration field, saturated vapor generating has the advantage of the following aspects compared with superheated steam generation:
(1) under the prerequisite of identical waste heat source thermal parameter, suitable with employing superheated steam unit generated energy after saturated vapour pressure is brought up to a certain degree.
(2) saturated-steam temperature level is lower, low to waste heat boiler material therefor heatproof demand, is easy to manufacture save cost, reduces investment.
(3) unit operation steadily, shut down number of times and reduce.While adopting superheated steam, in the time there is fluctuation in waste heat source thermal parameter, overheating steam temperature is subject to it to affect temperature to reduce, not only affect the economy of unit operation, also threatening the security of operation of unit, can produce a series of harm: the overload of last stage vane of steam turbine possibility, the steam moisture of several grade blades in end increases, degree of reactions at different levels increase, and high-temperature component will produce very large thermal stress and thermal deformation, water slug accident etc.If employing saturated vapor, because steam generator system itself has certain heat storage capacity, can adopt sliding parameter operation and not affect the safe operation of Steam Turbine 20 minutes downtimes with interior.
Claims (1)
1. the cooling chute waste heat boiler of an ISP control method, it is characterized in that, the method is specially: by the input group number realization of controlling chute heat exchanger, chute waste heat boiler load is carried out to coarse adjustment, the variation of controlling drum pressure realizes carries out fine tuning to chute waste heat boiler load.
2. the cooling chute waste heat boiler of ISP as claimed in claim 1 control method, is characterized in that, by the shutoff effect to described chute heat exchanger inlet and outlet valve sets, the group number of controlling input is realized the coarse adjustment of heat exchange amount.
3. the cooling chute waste heat boiler of ISP as claimed in claim 1 control method, it is characterized in that, by the adjusting to described drum pressure, thereby regulate evaporating temperature, heat transfer temperature difference, the coefficient of heat transfer, heat exchange amount, realize the fine tuning of whole chute residual heat boiler for exchanging heat amount.
4. the cooling chute waste heat boiler of ISP as claimed in claim 1 control method, is characterized in that, described chute waste heat boiler is provided with evaporating surface, and steam is saturated vapor, and steam pressure is set to low pressure parameter, and rated pressure is 0.8MPa-1.6MPa.
5. the cooling chute afterheat boiler electricity-generating system of ISP, it is characterized in that, this system comprises drum, some groups of the chute heat exchangers that are arranged side by side, chute waste heat boiler, saturated steam turbine and generators, each chute heat exchanger is all connected with drum by pipeline, on this pipeline, be provided with and control the valve whether chute heat exchanger devotes oneself to work, thereby realize, chute waste heat boiler load is carried out to coarse adjustment; Drum is connected with chute waste heat boiler by pipeline, is provided with drum outlet regulating valve on this pipeline, by regulating the aperture of drum outlet regulating valve, regulates the variation realization of drum pressure to carry out fine tuning to chute waste heat boiler load; Chute waste heat boiler load produces saturated vapor after coarse adjustment and fine tuning, input saturated steam turbine driving electric machine generating output electric energy.
6. the cooling chute afterheat boiler electricity-generating system of ISP as claimed in claim 5, is characterized in that, the pipeline that described chute heat exchanger is connected with drum comprises tedge and down-comer, is provided with valve on it.
7. the cooling chute afterheat boiler electricity-generating system of ISP as claimed in claim 6, it is characterized in that, the feedwater of described chute waste heat boiler is by after oxygen-eliminating device deoxygenation, be transported in described drum by feed pump, and then entered in described chute heat exchanger by forced circulation pump and valve by described down-comer, being heated therein intensification becomes saturation water and turns back in described drum by described tedge, carries out carbonated drink separation in drum.
8. the cooling chute afterheat boiler electricity-generating system of ISP as claimed in claim 5, it is characterized in that, described chute waste heat boiler produces saturated vapor and is conveyed into described drum, described drum saturated vapor out enters described saturated steam turbine after main inlet throttle-stop valve, and saturated steam turbine drives described motor generating output electric energy.
9. the cooling chute afterheat boiler electricity-generating system of ISP as claimed in claim 5, it is characterized in that, exhaust steam after described saturated steam turbine acting passes into condenser and carries out pressurizeing through condensate pump after condensation, squeeze into oxygen-eliminating device by heater again, condensed water after deoxygenation returns to described chute waste heat boiler after feed pump pressurization, completes whole thermodynamic cycle process.
10. the cooling chute afterheat boiler electricity-generating system of ISP as claimed in claim 9, is characterized in that, is provided with reheat in stage device in described saturated steam turbine.
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| CN103363513B (en) * | 2013-07-24 | 2015-10-07 | 陕西钢铁集团有限公司 | A kind of water supply system of sintering waste heat generating boiler |
| CN103453777A (en) * | 2013-08-29 | 2013-12-18 | 宁夏天纵泓光余热发电技术有限公司 | Smoke residual heat power generating system |
| CN104456596A (en) * | 2014-12-30 | 2015-03-25 | 黑龙江国德节能服务有限公司 | Module combination type heat exchanger and working method |
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|---|---|---|---|---|
| DE10035830A1 (en) * | 2000-07-22 | 2002-02-07 | Reflex Winkelmann & Pannhoff G | Apparatus for cooling exothermally operating production plants, e.g. blast and cupola furnaces, comprises cooling water cycle with cooling water supply container and degassing device for degassing cooling water |
| WO2010047004A1 (en) * | 2008-10-21 | 2010-04-29 | スチールプランテック株式会社 | Waste heat recovery facility of arc furnace for steel-making and method for recovering waste heat |
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