CN105293525A - Ammonium sulfate crystallization energy-saving process and energy-saving system - Google Patents
Ammonium sulfate crystallization energy-saving process and energy-saving system Download PDFInfo
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- CN105293525A CN105293525A CN201510810999.0A CN201510810999A CN105293525A CN 105293525 A CN105293525 A CN 105293525A CN 201510810999 A CN201510810999 A CN 201510810999A CN 105293525 A CN105293525 A CN 105293525A
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
- Y02P20/129—Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines
Abstract
The present invention provides an ammonium sulfate crystallization energy-saving process and an energy-saving system. According to the ammonium sulfate crystallization energy-saving process provided by the present invention, a compressor compresses evaporated steam produced from ammonium sulfate crystallization vacuum evaporation; the steam becomes super-heated steam at high temperature and at high pressure; and the super-heated steam at high temperature and at high pressure is directly or is used as a heat source of heat supply of the ammonium sulfate crystallization evaporation after being after humidified, to replace a conventional new steam heating ammonium sulfate mother solution and cooling water condensing and cooling vacuum evaporated steam. The ammonium sulfate crystallization energy-saving process and the energy-saving system provided by the present invention achieve recycling of low-temperature waste heat of the evaporated steam from the top of an ammonium sulphate crystallizer, have the advantages of high energy utilization, low power consumption, low operating cost and the like, and can be widely applied to ammonium sulfate production in steel, chemical engineering and other industries, and the fields of the ammonium sulfate produced by ammonia flue gas desulfurization in the steel, nonferrous metallurgical, thermal power, the chemical engineering, building materials and other industries.
Description
Technical field
The present invention relates to sulphur crystalline ammonium technology, particularly relate to a kind of sulphur crystalline ammonium energy-saving technique and energy conserving system.
Background technology
Current conventional sulphur crystalline ammonium technique is: ammonium sulfate liquor enters in sulphur crystalline ammonium device and carries out vacuum evaporating crystalization, and the ammonium sulfate liquor recycle pump of the ammonium sulfate liquor in sulphur crystalline ammonium device is extracted out, is back to sulphur crystalline ammonium device bottom after ammonium sulfate liquor heater heats again.Sulphur crystalline ammonium device top forms vacuum by vacuum pump, and ammonium sulfate liquor concentrates formation crystallization and sinks to bottom sulphur crystalline ammonium device because of vacuum-evaporation.Slurries containing sulphur crystalline ammonium are sent to centrifugation and are obtained sulphur crystalline ammonium.As shown in Figure 1, the ammonium sulfate liquor outlet in the middle part of described sulphur crystalline ammonium device 1 is communicated with ammonium sulfate liquor well heater 4 refrigerant inlet conventional sulphur crystalline ammonium system architecture, and described ammonium sulfate liquor well heater 4 refrigerant exit is communicated with the ammonium sulfate liquor entrance of sulphur crystalline ammonium device 1 bottom; The vapour outlet at described sulphur crystalline ammonium device 1 top is connected in turn with spray catcher 2, condensed device 6, vacuum pump 7.
In the single-action of current conventional sulphur ammonium or multiple-effect vacuum evaporative crystallization technique, circulation ammonium sulfate liquor adopts live steam heating, sulphur crystalline ammonium device top vacuum-evaporation steam out adopts cooling water condensation cooling, this processes expend a large amount of steam and water coolant, considerably increase energy consumption, and then significantly add the production run cost of sulphur ammonium.
Summary of the invention
The object of the invention is to, for above-mentioned conventional sulphur crystalline ammonium technique high energy consumption and high running cost problem, a kind of sulphur crystalline ammonium energy-saving technique is proposed, this technique achieves carrying out pick up the heat more than bin cure crystalline ammonium device evaporated on top steam low-temperature, there is the advantages such as high energy gamma source utilization ratio, less energy-consumption, low operating cost, can be widely used in the industry such as iron and steel, chemical industry sulphur ammonium to produce, and the ammonia type flue gas desulfurizing of the industry such as iron and steel, nonferrous metallurgy, thermoelectricity, chemical industry, building materials produces sulphur ammonium field.
For achieving the above object, the technical solution used in the present invention is: a kind of sulphur crystalline ammonium energy-saving technique, comprises the following steps:
Step 1, ammonium sulfate liquor enter vacuum-evaporation in sulphur crystalline ammonium device and produce sulphur crystalline ammonium, and the slurries containing sulphur crystalline ammonium are discharged bottom sulphur crystalline ammonium device; The evaporated vapor produced during vacuum-evaporation removes after the drop wherein carried secretly through spray catcher and enters compressor after flowing out from sulphur crystalline ammonium device top;
Step 2, compressor carry out compressed action to evaporated vapor, make it to heat up, to become temperature be 100-220 DEG C in boosting, absolute pressure is the high-temperature high-pressure overheat steam of 20-150kPa, and be preferably 150-200 DEG C, absolute pressure is the high-temperature high-pressure overheat steam of 45-100kPa;
Step 3, described high-temperature high-pressure overheat steam are delivered in ammonium sulfate liquor well heater, and for heating the circulation ammonium sulfate liquor carrying out bin cure crystalline ammonium device, high-temperature high-pressure overheat steam condensing cooling is condensed liquid;
Or work of water sprinkling for better material moisture is carried out to high-temperature high-pressure overheat steam, humidification obtains entering ammonium sulfate liquor well heater close to the steam of temperature of saturation, and for heating the circulation ammonium sulfate liquor carrying out bin cure crystalline ammonium device, the vapor condensation close to temperature of saturation is cooled to condensed liquid; The humidification water that part condensed liquid is humidified as high-temperature high-pressure overheat steam, residue condensed liquid is arranged outward.
Further, the described high-temperature high-pressure overheat steam of part enters compressor after mixing with evaporated vapor;
Further, the absolute pressure of evaporated vapor described in step 1 is 5-50kPa, and temperature is 36-80 DEG C, and preferred pressure is 10-30kPa, and temperature is 50-70 DEG C.
Further, described high-temperature high-pressure overheat steam and evaporated vapor mixed suction port of compressor mixing steam temperature are higher than evaporated vapor temperature 1-5 DEG C, preferable temperature 2-4 DEG C.
Further, ammonium sulfate liquor in ammonium sulfate liquor well heater, is heated to 45-100 DEG C close to the steam of temperature of saturation by high-temperature high-pressure overheat steam described in step 3 and/or humidification, is preferably 60-80 DEG C.
Another object of the present invention additionally provides a kind of sulphur crystalline ammonium energy conserving system, comprise sulphur crystalline ammonium device, ammonium sulfate liquor outlet in the middle part of described sulphur crystalline ammonium device is communicated with ammonium sulfate liquor well heater refrigerant inlet, and described ammonium sulfate liquor well heater refrigerant exit is communicated with the ammonium sulfate liquor entrance of sulphur crystalline ammonium device bottom; The vapour outlet at described sulphur crystalline ammonium device top is connected in turn with spray catcher, compressor, and described spray catcher liquid exit is communicated with sulphur crystalline ammonium device;
Described compressor outlet (high-temperature high-pressure overheat steam outlet) is communicated with ammonium sulfate liquor well heater heating agent entrance; Or described compressor outlet (humidification is close to saturated vapour outlet) is communicated with ammonium sulfate liquor well heater heating agent entrance, the outlet of described ammonium sulfate liquor well heater heating agent is communicated with ammonium sulfate liquor well heater heating agent entrance, makes part condensed liquid can as the humidification water of high-temperature high-pressure overheat steam.
Further, described compressor outlet is communicated with suction port of compressor, and the present invention makes the temperature of suction port of compressor mixing steam higher than evaporated vapor temperature 1-5 DEG C.
Sulphur crystalline ammonium energy-saving technique of the present invention is compressed the evaporated vapor that the produces during vacuum-evaporation of sulphur crystalline ammonium by compressor, become high-temperature high-pressure overheat steam, and by this high-temperature high-pressure overheat steam directly or after humidification, be used as the heat source of sulphur crystalline ammonium evaporation, substitute the high energy consumption mode of production of conventional live steam heating ammonium sulfate liquor and cooling water condensation cooling vacuum evaporated vapor, sulphur crystalline ammonium energy-saving technique of the present invention is simple, rationally, the present invention has the following advantages compared with routine techniques:
1, during sulphur ammonium vacuum evaporating crystalization, the evaporated vapor temperature flowed out from crystallizer top is 36-80 DEG C, and lower than mother liquor temperature 40-100 DEG C in crystallizer, heat cannot send the high temperature mother liquor in crystallizer automatically to from crystallizer top low temperature evaporated vapor.By the evaporated vapor compressed action that compressor flows out crystallizer top, make it to become high-temperature high-pressure overheat steam, and sent in ammonium sulfate liquor well heater and add hot mother liquor, thus achieve carrying out pick up the heat more than bin cure crystalline ammonium device evaporated on top steam low-temperature.
2, the present invention can be used on conventional sulphur ammonium vacuum evaporating crystalization Process ba-sis, need use outside live steam and water coolant except man-hour, when normally producing, without the need to heating ammonium sulfate liquor and cooling water condensation cooling vacuum evaporated vapor with live steam again.Compared with conventional sulphur ammonium vacuum evaporating crystalization technique, it is high that the present invention has energy utilization rate, the advantage that energy consumption is low and low operating cost is low.Such as, coking acid wash thiamine process produces the sulphur crystalline ammonium unit of ammonium sulfate products 45000t per year, adopts the energy consumption of sulphur crystalline ammonium energy-saving technique of the present invention and running cost to be only less than 35% and 45% of conventional sulphur crystalline ammonium process energy consumption respectively.
3, the present invention changes conventional sulphur ammonium multiple-effect vacuum evaporative crystallization technique into single-action crystallization energy-saving technique, or changes multiple single-action crystallization energy-saving technique into, can significantly improve sulphur ammonium production capacity.
To sum up, evaporative crystallization and compression combine by the present invention, make full use of cryogenic waste heat resource, while energy-saving and cost-reducing, realize cost degradation and produce.The present invention can be widely used in the industry such as iron and steel, chemical industry sulphur ammonium and produce, and the ammonia type flue gas desulfurizing of the industry such as iron and steel, nonferrous metallurgy, thermoelectricity, chemical industry, building materials produces sulphur ammonium field.
Accompanying drawing explanation
Fig. 1 is conventional sulphur crystalline ammonium process schematic representation;
Fig. 2 is embodiment 1 sulphur crystalline ammonium energy-saving technique and energy conserving system schematic diagram;
Fig. 3 is embodiment 2 sulphur crystalline ammonium-energy-saving technique and energy conserving system schematic diagram;
Fig. 4 is embodiment 3 sulphur crystalline ammonium energy-saving technique and energy conserving system schematic diagram.
Embodiment
Below in conjunction with embodiment, the present invention is further described:
Embodiment 1
Present embodiment discloses a kind of sulphur crystalline ammonium energy-saving technique and energy conserving system, its structure as shown in Figure 2, ammonium sulfate liquor outlet in the middle part of sulphur crystalline ammonium device 1 is communicated with ammonium sulfate liquor well heater 4 refrigerant inlet by ammonium sulfate liquor recycle pump 5, and described ammonium sulfate liquor well heater 4 refrigerant exit is communicated with the ammonium sulfate liquor entrance of sulphur crystalline ammonium device 1 bottom; The vapour outlet at described sulphur crystalline ammonium device 1 top is connected in turn with spray catcher 2, compressor 3, and described spray catcher 2 liquid exit is communicated with sulphur crystalline ammonium device 1;
Described compressor outlet is communicated with suction port of compressor; Described compressor outlet (humidification is close to saturated vapour outlet) is communicated with ammonium sulfate liquor well heater heating agent entrance, and described ammonium sulfate liquor well heater heating agent outlet is communicated with ammonium sulfate liquor well heater heating agent entrance.
The present embodiment adopts sulphur crystalline ammonium energy-saving technique and energy conserving system, and with coking acid wash thiamine process, single-effect evaporation manufacture level large-particle ammonium sulfate product is that example is described.
Step 1,41 DEG C of ammonium sulfate liquors enter sulphur crystalline ammonium device 1 and carry out vacuum-evaporation generation sulphur crystalline ammonium, slurries containing sulphur crystalline ammonium are discharged bottom sulphur crystalline ammonium device 1, sulphur crystalline ammonium device 1 top 9.7kPa (a) out, 46 DEG C of vacuum-evaporation steam, enter compressor 3 except after the drop of deentrainment in spray catcher 2.
Step 2, compressor 3 pairs of evaporated vapors carry out compressed action, make it intensification, boosting becomes high-temperature high-pressure overheat steam, the pressure and temperature of described high-temperature high-pressure overheat steam is respectively: 45.3kPa (a), 168 DEG C (corresponding temperature of saturation 78.4 DEG C).
Step 3, a small amount of high-temperature high-pressure overheat steam enter compressor 3 (making the temperature of suction port of compressor mixing steam higher than evaporated vapor temperature) after mixing with evaporated vapor before returning compressor 3 entrance again, and compressor 3 ingress mixing evaporated vapor temperature is 47 DEG C.Adopt condensed liquid to be humidified to residue high-temperature high-pressure overheat steam, 80 DEG C of steam after humidification are in ammonium sulfate liquor well heater 4, and become 70 DEG C of condensed liquids by mother liquor condensing cooling, condensed liquid is sent outside battery limit (BL).Ammonium sulfate liquor in sulphur crystalline ammonium device 1 is sent into after ammonium sulfate liquor well heater 4 is heated to 65 DEG C by ammonium sulfate liquor recycle pump 5, turns back in sulphur crystalline ammonium device 1 as vacuum evaporating crystalization provides heat.
Produce per year in the sulphur crystalline ammonium unit of ammonium sulfate products 68880t at coking acid wash thiamine process, when adopting sulphur crystalline ammonium energy-saving technique and crystallization energy conserving system, without the need to live steam, current consumption per hour about 1700 degree, water coolant per hour 50 tons; And when adopting conventional sulphur crystalline ammonium technique, live steam consumption per hour 15.8 tons, cooling-water consumption per hour 1300 tons, current consumption per hour about 150 degree.The energy consumption of sulphur crystalline ammonium energy-saving technique is only and adopts 32.4% of conventional sulphur crystalline ammonium process energy consumption, the running cost of sulphur crystalline ammonium energy-saving technique is only and adopts 42.3% of conventional sulphur crystalline ammonium process operation cost (when electricity 0.7 yuan/degree, steam 160 yuan/ton, during recirculated water 0.15 yuan/ton).
To sum up, the present embodiment adopts compressor to compress the evaporated vapor that the produces during vacuum-evaporation of sulphur crystalline ammonium, become high-temperature high-pressure overheat steam, and by this high-temperature high-pressure overheat steam directly or humidification close to the heat source being used as the evaporation of sulphur crystalline ammonium after temperature of saturation, thus achieve carrying out pick up the heat more than bin cure crystalline ammonium device evaporated on top steam low-temperature, and obtain the sulphur crystalline ammonium energy-saving technique with high energy gamma source utilization ratio, less energy-consumption, low operating cost feature thus.
Embodiment 2
Present embodiment discloses a kind of sulphur crystalline ammonium energy-saving technique and energy conserving system, as shown in Figure 3, with sintering flue gas ammonia method desulfurizing thiamine process, it is that example is described that single-effect evaporation produces ammonium sulfate products to its structure.
Step 1,60 DEG C of ammonium sulfate liquors enter sulphur crystalline ammonium device 1 and carry out vacuum-evaporation generation sulphur crystalline ammonium, slurries containing sulphur crystalline ammonium are discharged bottom sulphur crystalline ammonium device 1, sulphur crystalline ammonium device 1 top 14kPa (a) out, 51 DEG C of vacuum-evaporation steam, enter compressor 3 except after the drop of deentrainment in spray catcher 2.
Step 2, compressor 3 pairs of evaporated vapors carry out compressed action, make it intensification, boosting becomes high-temperature high-pressure overheat steam, the pressure and temperature of described high-temperature high-pressure overheat steam is respectively: 70kPa (a), 192 DEG C (corresponding temperature of saturation 89.5 DEG C).
Step 3, a small amount of high-temperature high-pressure overheat steam enter compressor 3 after mixing with evaporated vapor before returning compressor 3 entrance again, and compressor 3 ingress mixing evaporated vapor temperature is 53 DEG C.Adopt condensed liquid degree to be humidified to residue high-temperature high-pressure overheat steam, 91 DEG C of steam after humidification are in ammonium sulfate liquor well heater 4, and become 77 DEG C of condensed liquids by mother liquor condensing cooling, condensed liquid is sent outside battery limit (BL).Mother liquor in sulphur crystalline ammonium device 1 is sent into after ammonium sulfate liquor well heater 4 is heated to 76 DEG C by ammonium sulfate liquor recycle pump 5, turns back in sulphur crystalline ammonium device 1 as vacuum evaporating crystalization provides heat.
Evaporative crystallization and compression combine by the present embodiment, make full use of cryogenic waste heat resource, while energy-saving and cost-reducing, realize cost degradation and produce.
Embodiment 3
Present embodiment discloses a kind of sulphur crystalline ammonium energy conserving system, as shown in Figure 4, its structure is substantially the same manner as Example 1, is communicated with by ammonium sulfate liquor recycle pump 5 unlike the ammonium sulfate liquor outlet bottom sulphur crystalline ammonium device 1 described in the present embodiment with ammonium sulfate liquor well heater 4 refrigerant inlet.Namely the ammonium sulfate liquor containing sulphur crystalline ammonium bottom described sulphur crystalline ammonium device 1 is delivered in ammonium sulfate liquor well heater 4 by ammonium sulfate liquor recycle pump 5 and heats.
The present invention is not limited to sulphur crystalline ammonium energy-saving technique described in above-described embodiment and energy conserving system, and wherein the change of material concentration, temperature, flow is all within protection scope of the present invention.
Last it is noted that above each embodiment is only in order to illustrate technical scheme of the present invention, be not intended to limit; Although with reference to foregoing embodiments to invention has been detailed description, those of ordinary skill in the art is to be understood that: it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein some or all of technical characteristic; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the scope of various embodiments of the present invention technical scheme.
Claims (7)
1. a sulphur crystalline ammonium energy-saving technique, is characterized in that, comprises the following steps:
Step 1, ammonium sulfate liquor enter vacuum-evaporation in sulphur crystalline ammonium device and produce sulphur crystalline ammonium, and the slurries containing sulphur crystalline ammonium are discharged bottom sulphur crystalline ammonium device; The evaporated vapor produced during vacuum-evaporation removes after the drop wherein carried secretly through spray catcher and enters compressor after flowing out from sulphur crystalline ammonium device top;
Step 2, compressor carry out compressed action to evaporated vapor, make it to heat up, boosting becomes that temperature is 100-220 DEG C, absolute pressure is the high-temperature high-pressure overheat steam of 20-150kPa;
Step 3, high-temperature high-pressure overheat steam are delivered in ammonium sulfate liquor well heater, and for heating the circulation ammonium sulfate liquor carrying out bin cure crystalline ammonium device, high-temperature high-pressure overheat steam condensing cooling is condensed liquid;
Or work of water sprinkling for better material moisture is carried out to high-temperature high-pressure overheat steam, humidification obtains entering ammonium sulfate liquor well heater close to the steam of temperature of saturation, and for heating the circulation ammonium sulfate liquor carrying out bin cure crystalline ammonium device, the vapor condensation close to temperature of saturation is cooled to condensed liquid; The humidification water that part condensed liquid is humidified as high-temperature high-pressure overheat steam, residue condensed liquid is arranged outward.
2. sulphur crystalline ammonium energy-saving technique according to claim 1, is characterized in that, enter compressor after the described high-temperature high-pressure overheat steam of part mixes with evaporated vapor.
3. sulphur crystalline ammonium energy-saving technique according to claim 1, it is characterized in that, the absolute pressure of evaporated vapor described in step 1 is 5-50kPa, and temperature is 36-80 DEG C.
4. sulphur crystalline ammonium energy-saving technique according to claim 2, it is characterized in that, described high-temperature high-pressure overheat steam and evaporated vapor mixed suction port of compressor mixing steam temperature are higher than evaporated vapor temperature 1-5 DEG C.
5. sulphur crystalline ammonium energy-saving technique according to claim 1, is characterized in that, ammonium sulfate liquor in ammonium sulfate liquor well heater, is heated to 45-100 DEG C close to the steam of temperature of saturation by high-temperature high-pressure overheat steam described in step 3 and/or humidification.
6. a sulphur crystalline ammonium energy conserving system, is characterized in that, the ammonium sulfate liquor outlet in the middle part of sulphur crystalline ammonium device is communicated with ammonium sulfate liquor well heater refrigerant inlet, and described ammonium sulfate liquor well heater refrigerant exit is communicated with the ammonium sulfate liquor entrance of sulphur crystalline ammonium device bottom; The vapour outlet at described sulphur crystalline ammonium device top is connected in turn with spray catcher, compressor, and described spray catcher liquid exit is communicated with sulphur crystalline ammonium device;
Described compressor outlet is communicated with ammonium sulfate liquor well heater heating agent entrance, and described ammonium sulfate liquor well heater heating agent outlet is communicated with ammonium sulfate liquor well heater heating agent entrance.
7. sulphur crystalline ammonium energy conserving system according to claim 6, it is characterized in that, described compressor outlet is communicated with suction port of compressor.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109437239A (en) * | 2018-12-27 | 2019-03-08 | 中冶焦耐(大连)工程技术有限公司 | The low temperature position exhaust heat recovering method and device of process are absorbed in a kind of acid-making process |
| CN111530119A (en) * | 2020-04-14 | 2020-08-14 | 中石化南京工程有限公司 | Tandem ammonium sulfate crystallization method and device thereof |
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| CN103466657A (en) * | 2013-09-25 | 2013-12-25 | 瓮福（集团）有限责任公司 | Utilization method of three-stage steam in ammonium sulfate production |
| CN104229835A (en) * | 2014-09-04 | 2014-12-24 | 刘燕芳 | Method for dechlorination of potassium chloride by adopting vapor compression recycling technology |
| CN104386710A (en) * | 2014-10-22 | 2015-03-04 | 北京华福工程有限公司 | Device and method for producing ammonium sulfate |
| CN104548650A (en) * | 2015-01-18 | 2015-04-29 | 丁武轩 | Continuous evaporative crystallization method |
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| CN101531382A (en) * | 2008-12-29 | 2009-09-16 | 卫宏远 | Production process and crystallization device for large-particle ammonium sulfate |
| CN103466657A (en) * | 2013-09-25 | 2013-12-25 | 瓮福（集团）有限责任公司 | Utilization method of three-stage steam in ammonium sulfate production |
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