CN100358800C - Electric furnace method yellow phosphorus tail gas residual heat comprehensive balance utilizing system - Google Patents

Electric furnace method yellow phosphorus tail gas residual heat comprehensive balance utilizing system Download PDF

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Publication number
CN100358800C
CN100358800C CNB2006100107305A CN200610010730A CN100358800C CN 100358800 C CN100358800 C CN 100358800C CN B2006100107305 A CNB2006100107305 A CN B2006100107305A CN 200610010730 A CN200610010730 A CN 200610010730A CN 100358800 C CN100358800 C CN 100358800C
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tail gas
heat
yellow phosphorus
electric furnace
furnace method
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CNB2006100107305A
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Chinese (zh)
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CN1814547A (en
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刘连城
杨漾平
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昆明阳光基业股份有限公司
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Abstract

The present invention relates to a residual heat comprehensive balance using system of yellow phosphorus tail gas produced with an electric furnace method. The present invention has the technical scheme that the present invention provides comprehensive balance use integrated technology which can effectively and safely use the heat energy of the yellow phosphorus tail gas in a comprehensive use mode for generating electricity, drying raw materials and heating producing hot water; the integrated system can meet the heat energy requirements of drying producing raw materials of the yellow phosphorus, and can generate electricity as much as possibly for the power utilization of yellow phosphorus electric furnaces. The integrated system of the present invention comprises a tail gas preprocessing and purifying subsystem, a heat accumulating type combustion and heat exchange subsystem, a residual heat boiler subsystem, a hot air subsystem for drying the producing raw materials of the yellow phosphorus, a production hot water subsystem for the yellow phosphorus, a turbine electricity generation subsystem, and an electrical distribution and autocontrol subsystem.

Description

Electric furnace method yellow phosphorus tail gas residual heat comprehensive balance utilizes system

Technical field

The present invention relates to a kind of electric furnace method yellow phosphorus tail gas residual heat comprehensive balance and utilize system, yellow phosphoric tail gas cogeneration and thermodynamic equilibrium system that especially supporting producing yellow Phosphorus by electric oven uses.

Background technology

During producing yellow Phosphorus by electric oven Rock Phosphate (72Min BPL), silica, coke are mixed by ratio of components, in electric furnace, it is elemental phosphorous that phosphoric in the Rock Phosphate (72Min BPL) is reduced into, and coke is oxidized to carbon monoxide in this reaction process.The carbon monoxide that reaction produces wrap up in be with that gasiform is elemental phosphorous, ash and a small amount of water vapor overflow from electric furnace together, lower the temperature with the spray water washing through three grades of water cooling towers, make the elemental phosphorous of gas phase be condensed into liquid state and, enter the phosphorus recovery system with spray water with most of dust.Remaining gas comes out to form yellow phosphoric tail gas through three grades of water cooling towers, this yellow phosphoric tail gas calorific value: 10659KJ/Nm 3, smoke content: 73.3mg/Nm 3, oxide compound: 10.8mg/Nm 3, the exhaust gas component composition is roughly:

Under the normal circumstances, yellow phosphoric tail gas composed as follows:

Component in the tail gas Concentration of volume percent ????CO ????85%~95% ????O 2 ????0.1%~0.5% ????CO 2 ????2%~4% Other gases ????2%~5%

Wherein other gases is composed as follows:

Component in other gases Content (g/Nm 3) ????P 2,??PH 3 ????1~3 ????H 2S, organosulfur ????0.6~3.0 ????HF,SiF 4 ????0.4~0.5 ????As ????0.07~0.08

Yellow phosphoric tail gas is that a kind of industrial chemicals can be produced Chemicals such as oxalic acid, formic acid, and it also is a kind of fine geseous fuel simultaneously.

But produce Chemicals such as oxalic acid, formic acid owing to utilize yellow phosphoric tail gas, tail gas clean-up technology more complicated, to purify cost higher and effect is unsatisfactory, so vast for a long time yellow phosphorus factory all is primarily focused on and utilizes the exhaust heat-energy aspect, but mostly just utilizes tail gas to do raw ore exsiccant thermal source.Can utilize 30% of tail gas amount but this always accounts for, all the other yellow phosphoric tail gas remain the burning of emptying in vain, have both caused certain environmental pollution, have greatly wasted the energy again.

How to effectively utilize the heat energy of yellow phosphoric tail gas more, existing many people did discussion.Directly use the generating of yellow phosphoric tail gas burning boiler, boiler operatiopn two is to March, because it is phosphorous and dust is too high in the tail gas, phosphorus and iron generation ferrophosphorus produces on phosphoric anhydride and the tube wall of metaphosphoric acid acid anhydride attached to boiler surface simultaneously under high-temperature condition, destroyed the water cycle heating surface tube wall of boiler, the existence of phosphoric anhydride, metaphosphoric acid acid anhydride produces high temperature corrosion, and boiler burns out very soon, finally ends in failure.

Summary of the invention

The object of the invention provides a kind of electric furnace method yellow phosphorus tail gas residual heat comprehensive balance and utilizes system, complete solution phosphorus furnace exhaust gas waste heat complementary energy synthesis utilization and utilize the deficiency of the above-mentioned background technology such as burn into obstruction in the process.

System schema provided by the invention is:

Electric furnace method yellow phosphorus tail gas residual heat comprehensive balance utilizes system, comprise tail gas pre-treatment refining plant, combustion heat-exchange device, waste heat boiler device, for the phosphorus production raw material stoving with hot air apparatus, for phosphorus production with hot water apparatus, steam turbine generating device, for distribution and automatic control device.It is characterized in that described combustion heat-exchange device is to be struck a bargain for burning and heat exchange by two above heat storage type combustion heat exchanger package, the heat storage type combustion interchanger is arranged on outside the waste heat boiler, tail gas and air are in heat storage type combustion interchanger internal combustion, heat storage in the heating heat storage type combustion interchanger gets up thermal energy storage, exchanges with heat transferring medium then thermal medium is sent into the waste heat boiler device.Set up between yellow phosphorus electric furnace and three grades of water cooling towers: tail gas pretreatment units such as settling pocket, tornado dust collector or settling pocket, sack cleaner, to reduce the dustiness of tail gas, satisfy the requirement of combustion heat-exchange device.Also the tail gas pretreatment unit can be arranged in after three grades of water cooling towers, adopt washing tower and Venturi Scrubber to come cleaning of off-gas.In the heat storage type combustion interchanger, arrange that suitably iron ball absorbs obnoxious flavoures such as phosphorus in the flue gas, fluorine, flue reaches emission standard.The dress heat-pipe heat exchanger adds hot exhaust gas and makes funnel temperature below 150 ℃ in the fume exhaust system of heat storage type combustion interchanger, makes whole combustion heat-exchange plant efficiency more than 85%.In waste heat boiler, for satisfying phosphorus production drying material hot blast demand, be furnished with high-temperature air preheater at boiler tail, with air heating, the charging feed drying system.For satisfying the demand of phosphorus production to hot water, be furnished with hot water generator at boiler tail, satisfy the phosphorus production demand.The heat-transfer medium of waste heat boiler device recycles.Heat transferring medium is water vapour and the CO with radiation heat transfer ability 2Mixed gas.Adopt SIEMENS PCS7 program control system for distribution and automatic control.

Electric furnace method yellow phosphorus tail gas residual heat comprehensive balance utilizes system to be characterised in that and has adopted the heat storage type combustion heat-exchange system, its principle is tail gas and the heat storage type combustion interchanger internal combustion of air outside the waste heat boiler device, heat storage in the heating heat storage type combustion interchanger gets up thermal energy storage, exchange with special-purpose heat transferring medium then, heat transferring medium is sent into the waste heat boiler device, heat storage type combustion interchanger adapted is more than two, a burning heating heat storage, another and heat transferring medium heat exchange, and thermal medium sent into waste heat boiler.The flue gas that burning produces does not contact with the boiler surface metallic conduit.Therefore stopped the P that tail gas contains fully 2, PH 3, H 2S, HF, SiF 4, obnoxious flavour such as As is to the high temperature corrosion of boiler surface.

The three kinds of comparatively perfect electric furnace method yellow phosphorus tail gas residual heat comprehensive balances that overcome the above problems utilize system, are respectively that tornado dust collector tail gas pre-treatment electric furnace method yellow phosphorus tail gas residual heat comprehensive balance shown in Figure 1 utilizes system, sack cleaner tail gas pre-treatment electric furnace method yellow phosphorus tail gas residual heat comprehensive balance shown in Figure 2 to utilize system, washing tower and Venturi Scrubber tail gas pre-treatment electric furnace method yellow phosphorus tail gas residual heat comprehensive balance shown in Figure 3 to utilize system.

The common feature of these three kinds of systems is:

Heat storage type combustion interchanger, waste heat boiler device, for the phosphorus production raw material stoving with hot air apparatus, for phosphorus production with hot water apparatus, steam turbine generating device, identical for distribution and automatic control device.

The different characteristics of these three kinds of systems is:

Tail gas pre-treatment refining plant is inequality.

The invention has the advantages that: carry out alternative burning accumulation of heat and heat exchange by the heat storage type combustion interchanger, completely cut off the highly corrosive when yellow phosphoric tail gas burns, successfully utilized the contained energy of yellow phosphoric tail gas.

Description of drawings

Fig. 1 is that tornado dust collector tail gas pre-treatment electric furnace method yellow phosphorus tail gas residual heat comprehensive balance utilizes system schematic.

Fig. 2 is that sack cleaner tail gas pre-treatment electric furnace method yellow phosphorus tail gas residual heat comprehensive balance utilizes system schematic.

Fig. 3 is that washing tower and Venturi Scrubber tail gas pre-treatment electric furnace method yellow phosphorus tail gas residual heat comprehensive balance utilize system schematic.

Embodiment

1-yellow phosphorus electric furnace among the figure, 2-trickle cooling tower, 3-washing tower, the 4-settling pocket, 5-Venturi Scrubber, 6-tornado dust collector, the 7-sack cleaner, 8-yellow phosphoric tail gas water trap, 9-yellow phosphoric tail gas preheater, the 10-Safety water seal, 11-waste heat boiler, 12-water pump, the 13-induced draft fan, 14-hot water heater, 15-hot blast interchanger, the 16-air preheater, 17-economizes coal gas, 18-boiler feedpump, the 19-water tank, 20-fan, 21-turbo-generator, the 22-generator, 23-condenser, 24-condensate pump, the 25-cooling tower, the 26-cooling-water pump, 27-chimney 28-superheater, 29-heat storage type combustion interchanger.

Prepare technical scheme of the present invention system in the following manner:

1, tail gas pre-treatment refining plant

Yellow phosphoric tail gas contains CO, O 2, CO 2With other gas, and have a large amount of flue dust, tail gas pre-treatment purifying subsystem is used for yellow phosphoric tail gas dedusting and purification.

(1) scheme one:

Yellow phosphoric tail gas enters settling pocket after discharging in the electric furnace, enters tornado dust collector then, enters three grades of water cooling towers at last.

(2) scheme two:

Yellow phosphoric tail gas enters settling pocket after discharging in the electric furnace, enters sack cleaner then, enters three grades of water cooling towers at last.

(3) scheme three:

Yellow phosphoric tail gas enters washing tower and Venturi Scrubber in conjunction with refining plant after discharging in the electric furnace behind three grades of water cooling towers.Tail gas is entered by wash tower bottoms, and discharge on top, is provided with the shower nozzle water spray between hereinto, and water and exhaust gas flow direction are opposite, and water can be taken away a part of dust, enters Venturi meter after tail gas comes out from tower top tail gas is further cleaned.Water enters mud phosphorus system after collect the bottom of tower, mud phosphorus recycles after discharging and entering its water treatment system.After this washing, the dustiness of tail gas is reduced to 10mg/m 3, the phosphorous 0.2mg/m that reduces to 3

2, heat storage type combustion interchanger

This heat storage type combustion heat exchange subsystem is made of two heat storage type combustion interchanger, and one of them tail gas through purifying enters nozzles through preheater.Enter nozzles after combustion air is sent into the preheating of boiler tail preheater by blower fan simultaneously, with yellow phosphoric tail gas mixed firing.High-temperature flue gas after the burning makes phosphorus in the flue gas react with hot steel ball through the steel ball of the some amount that is arranged on heat storage type combustion interchanger top and produces iron phosphide with the phosphorus in the removal flue gas.Flue gas heating heat storage then, the waste gas of generation enters the yellow phosphoric tail gas preheater, heating low temperature yellow phosphoric tail gas.Flue-gas temperature enters chimney after reducing to 150 ℃.

Simultaneously the low-temperature heat exchange medium of being sent by boiler enters another heat storage type combustion interchanger by blower fan and carries out heat exchange, enters boiler after making heat transferring medium reach 1200 ℃ to produce high temperature and high pressure steam.

Two heat storage type combustion interchanger switched according to certain cycle.

3, waste heat boiler device

1200 ℃ of heat transferring mediums enter boiler furnace and heat, through water wall, superheater, and economizer, raw material baking air preheater, the combustion air air preheater, hot water generator is sent into the heat storage type combustion interchanger by blower fan after temperature is fallen 100 ℃.Send into steam turbine acting generating at the high temperature and high pressure steam that this process produces,

4, for phosphorus production raw material stoving hot air apparatus

Arrange heat exchanger at boiler back end ductwork, the configuration fan is sent freezing air into heat exchanger heats, produces high-temperature hot-air charging feed drying system.

5, for the phosphorus production hot water apparatus

Arrange the coil interchanger in boiler tail least significant end, by water pump softening water is sent into the heating of coil interchanger, produce 100 ℃ hot water, the hot water by two different thermoswitchs generation differing tempss satisfies the hot water demand of phosphorus production system.

6, steam turbine generating device

The high temperature and high pressure steam that is produced by boiler enters steam turbine power generation, and steam becomes water of condensation through condenser condenses, and water of condensation is drawn to oiler feed through condensate pump and is pumped into boiler and circulates.

7, for distribution and automatic control device

Adopt SIEMENS PCS7 program control system to realize: tail gas pre-treatment refining plant, heat storage type combustion interchanger, waste heat boiler device, for the phosphorus production raw material stoving with hot air apparatus, for the three electrical integrated process control of phosphorus production with hot water apparatus, steam turbine power generation subsystem.

Claims (8)

1, electric furnace method yellow phosphorus tail gas residual heat comprehensive balance utilizes system, comprise tail gas pre-treatment refining plant, the combustion heat-exchange device, the waste heat boiler device, for phosphorus production raw material stoving hot air apparatus, for the phosphorus production hot water apparatus, steam turbine generating device, for distribution and automatic control device, it is characterized in that described combustion heat-exchange device is made up of two above heat storage type combustion interchanger, burning and heat exchange hocket, the heat storage type combustion interchanger is arranged on outside the waste heat boiler, tail gas and air are in heat storage type combustion interchanger internal combustion, heat storage in the heating heat storage type combustion interchanger gets up thermal energy storage, then with water vapour and CO with radiation heat transfer ability 2The heat transferring medium of mixed gas exchange, afterwards heat transferring medium is sent into waste heat boiler.
2, electric furnace method yellow phosphorus tail gas residual heat comprehensive balance according to claim 1 utilizes system, it is characterized in that described tail gas pre-treatment refining plant is to be made of settling pocket, tornado dust collector and three grades of water cooling towers.
3, electric furnace method yellow phosphorus tail gas residual heat comprehensive balance according to claim 1 utilizes system, it is characterized in that described tail gas pre-treatment refining plant is to be made of settling pocket, sack cleaner and three grades of water cooling towers.
4, electric furnace method yellow phosphorus tail gas residual heat comprehensive balance according to claim 1 utilizes system, it is characterized in that in described heat storage type combustion interchanger, and the obnoxious flavour in the iron ball absorption flue gas suitably is set, and flue reaches emission standard.
5, electric furnace method yellow phosphorus tail gas residual heat comprehensive balance according to claim 1 utilizes system, it is characterized in that in described waste heat boiler device for satisfying phosphorus production drying material hot blast demand, boiler tail is furnished with high-temperature air preheater, with air heating, the charging feed drying system.
6, electric furnace method yellow phosphorus tail gas residual heat comprehensive balance according to claim 1 utilizes system, it is characterized in that being furnished with hot water generator at the boiler tail of described waste heat boiler device, satisfies the phosphorus production demand.
7, electric furnace method yellow phosphorus tail gas residual heat comprehensive balance according to claim 1 utilizes system, it is characterized in that the heat transferring medium of described waste heat boiler device recycles.
8, electric furnace method yellow phosphorus tail gas residual heat comprehensive balance according to claim 1 utilizes system, it is characterized in that adopting SIEMENS PCS7 program control system described for distribution and automatic control.
CNB2006100107305A 2006-03-06 2006-03-06 Electric furnace method yellow phosphorus tail gas residual heat comprehensive balance utilizing system CN100358800C (en)

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Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101520170B (en) * 2008-02-27 2012-09-26 谢西平 Super-critical, high-pressure steam, tripe section-type waste heat boiler with dust removal function
CN101509425B (en) * 2009-03-19 2010-09-29 株洲南方燃气轮机成套制造安装有限公司 Gas turbine generating set
CN102678195B (en) * 2012-06-08 2015-03-25 云南澄江盘虎化工有限公司 Yellow phosphorus tail gas multiple gas-source combustion power generation system
CN102778134A (en) * 2012-06-21 2012-11-14 遵义市贵科科技有限公司 New process for utilizing waste heat of flue gas of semi-enclosed ore-smelting electric furnace
CN103213959B (en) * 2013-03-29 2015-10-07 成都易态科技有限公司 From mud phosphorus, elemental phosphorous method and application is reclaimed by cross-flow membrane micro-filtration
CN104075332B (en) * 2014-07-18 2016-09-07 武汉东晟捷能科技有限公司 For improving the system and method for yellow phosphoric tail gas comprehensive utilization ratio
CN104155946A (en) * 2014-07-29 2014-11-19 湖北亚太能源科技有限公司 Automatic conveying system for yellow phosphorus electric furnace tail gas
CN105731405B (en) * 2016-01-20 2017-10-27 昆明理工大学 One kind has the recoverable phosphorous acid production by BEP device of Low Temperature Thermal
CN105536374A (en) * 2016-01-29 2016-05-04 青岛青力环保设备有限公司 Cupola tail gas treatment system

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