CN102252530B - Novel waste heat utilization and emission reduction process for hot air systems of chain grate machine, rotary kiln and circular cooler - Google Patents
Novel waste heat utilization and emission reduction process for hot air systems of chain grate machine, rotary kiln and circular cooler Download PDFInfo
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- CN102252530B CN102252530B CN 201110198799 CN201110198799A CN102252530B CN 102252530 B CN102252530 B CN 102252530B CN 201110198799 CN201110198799 CN 201110198799 CN 201110198799 A CN201110198799 A CN 201110198799A CN 102252530 B CN102252530 B CN 102252530B
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Abstract
The invention relates to a waste heat utilization and emission reduction process for hot air systems of a chain grate machine, a rotary kiln and a circular cooler. The process is characterized by comprising the following steps of: supplying hot air in a preheating zone I to a blowing drying zone to dry the material in the blowing drying zone; supplying the waste gas in a four-cooling zone to a secondary cooling zone to cool the material in the secondary cooling zone; and supplying waste gas from a three-cooling zone to a first cooling zone to cool the material in the first cooling zone. By the process, waste heat and heat of pellet hot air systems of the chain grate machine and the rotary kiln can be fully utilized, the resistance loss of hot air is low, the operating cost of a fan can be reduced, circulating waste heat utilization of hot waste gas to be exhausted is realized, energy is saved, and emission is reduced.
Description
Technical field
The present invention relates to chain grate machine-rotary kiln pelletizing hot-air system technical field, a kind of chain grate machine-rotary kiln-central cooler hot-air system UTILIZATION OF VESIDUAL HEAT IN and emission-reducing system particularly is provided.
Background technology
China's Eleventh Five-Year Plan development outline clearly proposes and will build a resource-conserving and environment-friendly society, and lists the day scale value of unit GDP energy resource consumption reduction by 20% and total emissions of major pollutants minimizing 10% in the binding indicator; And require to strengthen prevention and control of air pollution, make great efforts to advance the comprehensive regulation of the industry sulfur dioxide such as coal-burning power plant, iron and steel, coloured, chemical industry, building materials; Realize strict environmental protection performance appraisal, environmental law enforcement responsibility system and the system of accountability; Implement total emission volumn control, discharge permit and the system of environmental impact assessment.Therefore, the referred unprecedented height of resources conservation and environmental friendliness has become the emphasis of current macro adjustments and controls.Sulphur in the pelletizing is mainly from iron ore, and seldom part is from solid fuel.In the pelletizing production process, have approximately 80% one 95% sulphur to discharge with the form of sulfur dioxide with flue gas through chemical reactions such as peroxidating, decomposition in the crude fuel, remaining sulphur remains in the pellet.Therefore, desulfurization work is mainly processed the discharging flue gas, and desulphurization cost is proportional with pending discharging exhaust gas volumn, only has the purpose that reaches the reduction desulphurization cost by reducing smoke discharge amount.
Hot blast is recycling in chain grate machine-rotary kiln-central cooler pelletizing process hot-air system.Comprise by blasting drying period, the down-draft drying zone, preheating I section, the chain grate machine that preheating II section forms, by one cold section and NO.1 cooling blower, secondary cooling zone and NO.2 cooling blower, the central cooler that three cold sections and NO.3 cooling blower and four cold sections and NO.4 cooling blower form, the rotary kiln that connects described chain grate machine and central cooler, be arranged on the burner on this rotary kiln, the main exhauster that is connected with desulfurizer, be arranged on the forced air drying bonnet blower fan between this desulfurizer and the described blasting drying period, four sections that chain grate machine divides, separate with partition wall between each section, be followed successively by blasting drying period from feed end, the down-draft drying zone, preheating I section, preheating II section.Central cooler generally is divided into four cooling sections, is followed successively by to cold ball from hot-bulb: one cold section, secondary cooling zone, three cold sections, four cold sections.Chain grate apparatus for forced section hot blast is from three cold sections of central coolers; The hot blast of down-draft drying zone is from preheating II section; The hot blast of preheating I section is from the secondary cooling zone of central cooler; The hot blast of preheating II section is from rotary kiln; The secondary hot-air of rotary kiln is from one cold section of central cooler.
Generally speaking, chain grate apparatus for forced section hot blast is from three cold sections of central coolers, and is far away to chain grate apparatus for forced segment distance from three cold sections of central coolers, and construction cost is high; And hot blast hot air duct length apart from course of conveying in heat large, simultaneously, the hot blast drag losses is all larger, the fan operation cost is high;
In addition, chain grate machine waste gas has three strands of air-flows: preheating I section bellows hot blast, down-draft drying zone bellows hot blast, blasting drying period upper cover hot blast.Three strands of waste gas all will be processed it through desulfurizer, and the operation of desulfurization expense is large, and discharge amount of exhaust gas is also relatively large.The hot blast that central cooler is four cold sections does not generally recycle owing to be lower than 120 ℃, and is emptying through dedusting.
Summary of the invention
The purpose of this invention is to provide a kind of waste heat that takes full advantage of chain grate machine-rotary kiln pelletizing hot-air system, heat and hot blast drag losses are all less, can reduce the operating cost of blower fan, the chain grate machine-rotary kiln of energy-saving and emission-reduction-central cooler hot-air system UTILIZATION OF VESIDUAL HEAT IN and emission-reducing system.
Chain grate machine-rotary kiln of the present invention-central cooler hot-air system UTILIZATION OF VESIDUAL HEAT IN and emission-reducing system, comprise by blasting drying period, the down-draft drying zone, preheating I section, the chain grate machine that preheating II section forms, by one cold section and NO.1 cooling blower, secondary cooling zone and NO.2 cooling blower, the central cooler that three cold sections and NO.3 cooling blower and four cold sections and NO.4 cooling blower form, the rotary kiln that connects described chain grate machine and central cooler, be arranged on the burner on this rotary kiln, the main exhauster that is connected with desulfurizer, be arranged on the forced air drying bonnet blower fan between this desulfurizer and the described blasting drying period, the hot waste gas of described preheating II section enters the down-draft drying zone, material in the described preheating I of the hot waste gas preheating section of described secondary cooling zone, material in the described preheating II of the hot waste gas preheating section of described rotary kiln, described one cold section hot waste gas enters described rotary kiln, it is characterized in that:
1) between described preheating I section and blasting drying period the dry-heat air pipeline is set, the hot waste gas of described preheating I section enters described blasting drying period through drum dry-air blast machine, comes the material in dry this blasting drying period,
2) between described four cold sections and secondary cooling zone, two cold but pipelines are set, in this two cold but pipeline, the NO.2 cooling blower is set, described four cold sections upper cover waste gas blasts described secondary cooling zone through the NO.2 cooling blower material in this secondary cooling zone is cooled off
3) between described three cold sections upper cover and described one cold section, a cold but pipeline is set, in this cold but pipeline the NO.1 cooling blower is set, described three cold sections upper cover waste gas blasts one cold section through the NO.1 cooling blower material in this cold section is cooled off.The hot waste gas circulation UTILIZATION OF VESIDUAL HEAT IN that realization should be discharged.
Compared with prior art the invention has the beneficial effects as follows:
1) because the present invention feeds the blasting drying period drying with the hot waste gas of preheating I section, the material in the blasting drying period is carried out preheating; Three cold sections hot blast characteristics of the hot blast characteristic of preheating I section bellows and central cooler are similar can to substitute three cold sections hot blasts fully to blasting drying period; Preheating I section bellows hot blast to blasting drying period, is had the pipeline weak point, and heat and hot blast drag losses are all less, can reduce the operating cost of blower fan;
2) because the bright waste gas with four cold sections of the utility model has fed secondary cooling zone, four cold sections low temperature waste gas of central cooler do not efflux, not only reduce pollution but also effective energy savings, can improve again central cooler secondary cooling zone outlet hot blast temperature, also improved chain grate machine preheating I section upper cover temperature simultaneously;
3) because the present invention feeds one cold section with three cold sections hot blast, three cold sections low temperature waste gas of central cooler are no longer delivered to chain grate apparatus for forced section, both reduced by a long distance hot air duct, can improve again one cold section outlet of central cooler hot blast temperature, namely improve the purpose that rotary kiln Secondary Air temperature reaches fuel saving.
Description of drawings
Fig. 1 is structural representation of the present invention.
The specific embodiment
Below in conjunction with description of drawings the specific embodiment of the present invention.
As shown in Figure 1, chain grate machine-rotary kiln of the present invention-central cooler hot-air system UTILIZATION OF VESIDUAL HEAT IN and emission-reducing system, comprise by blasting drying period 3, down-draft drying zone 4, preheating I section 5, the chain grate machine that preheating II section 6 forms, by one cold section 10 and NO.1 cooling blower 19, secondary cooling zone 11 and NO.2 cooling blower 18, the central cooler that three cold sections 12 and NO.3 cooling blower 17 and four cold sections 13 and NO.4 cooling blower 16 form, the rotary kiln 7 that connects described chain grate machine and central cooler, be arranged on the burner 9 on this rotary kiln 7, the main exhauster 22 that is connected with desulfurizer 1, be arranged on the forced air drying bonnet blower fan 2 between this desulfurizer 1 and the described blasting drying period 3, the hot waste gas of described preheating II section 6 enters down-draft drying zone 4, material in the described preheating I of the hot waste gas preheating section 5 of described secondary cooling zone 16, material in the described preheating II of the hot waste gas preheating section 6 of described rotary kiln 7, described one cold section 18 hot waste gas enters described rotary kiln 7, it is characterized in that:
The present invention arranges dry-heat air pipeline 21 between described preheating I section 5 and blasting drying period 3, the hot waste gas of described preheating I section 5 enters described blasting drying period 3 through drum dry-air blast machine 20, come the material in dry this blasting drying period 3, when preheating I section 5 hot waste gas during to blasting drying period, reduce and come from the hot waste gas of chain grate machine preheating I section bellows, can substitute three cold sections hot blasts fully to blasting drying period because three cold sections hot blast characteristics of hot blast characteristic and central cooler of preheating I section bellows are similar; To blasting drying period, can satisfy the hot blast needs of blasting drying period to preheating I section hot waste gas, but also have the pipeline weak point, heat and hot blast drag losses are all less, can reduce the operating cost of blower fan.The hot waste gas circulation UTILIZATION OF VESIDUAL HEAT IN that realization should be discharged.Chain grate machine waste gas only is left two strands of air-flows like this: down-draft drying zone bellows hot blast, blasting drying period upper cover hot blast.Desulfurizer is that final waste gas is processed, and the less desulfurization operation expense of total exhausted air quantity is less, and the exhausted air quantity that finally enters environment is less, reaches the purpose of energy-saving and emission-reduction.
The present invention arranges two cold but pipelines 14 between described four cold sections 13 and secondary cooling zone 11, in this two cold but pipeline 14, NO.2 cooling blower 18 is set, described four cold sections 13 upper cover waste gas blasts described secondary cooling zone 11 through NO.2 cooling blower 18 material in this secondary cooling zone 11 is cooled off, four cold sections 13 waste gas of originally discharging are fully utilized, pollution, energy savings had both been reduced, can improve again central cooler secondary cooling zone outlet hot blast temperature, also improve chain grate machine preheating I section upper cover temperature simultaneously.
The present invention arranges a cold but pipeline 15 between described three cold sections 12 upper cover and described one cold section 10, in this cold but pipeline 15 NO.1 cooling blower 19 is set, described three cold sections 12 upper cover waste gas blasts one cold section 10 through NO.1 cooling blower 19 material in this cold section is cooled off.Three cold sections low temperature waste gas of central cooler are no longer delivered to chain grate apparatus for forced section, have both reduced by a long distance hot air duct, can improve again one cold section outlet of central cooler hot blast temperature, namely improve the purpose that rotary kiln Secondary Air temperature reaches fuel saving.
The present invention is equally applicable to the hot-air system UTILIZATION OF VESIDUAL HEAT IN that small-sized pelletizing plant central cooler and chain grate machine are divided into three sections.
Claims (1)
1. chain grate machine-rotary kiln-central cooler hot-air system UTILIZATION OF VESIDUAL HEAT IN and emission-reducing system, comprise by blasting drying period, the down-draft drying zone, preheating I section, the chain grate machine that preheating II section forms, by one cold section and NO.1 cooling blower, secondary cooling zone and NO.2 cooling blower, the central cooler that three cold sections and NO.3 cooling blower and four cold sections and NO.4 cooling blower form, the rotary kiln that connects described chain grate machine and central cooler, be arranged on the burner on this rotary kiln, the main exhauster that is connected with desulfurizer, be arranged on the forced air drying bonnet blower fan between this desulfurizer and the described blasting drying period, the hot waste gas of described preheating II section enters the down-draft drying zone, material in the described preheating I of the hot waste gas preheating section of described secondary cooling zone, material in the described preheating II of the hot waste gas preheating section of described rotary kiln, described one cold section hot waste gas enters described rotary kiln, it is characterized in that:
1) between described preheating I section and blasting drying period the dry-heat air pipeline is set, the hot waste gas of described preheating I section enters described blasting drying period through drum dry-air blast machine, comes the material in dry this blasting drying period,
2) between described four cold sections and secondary cooling zone, two cold but pipelines are set, in this two cold but pipeline, the NO.2 cooling blower is set, described four cold sections upper cover waste gas blasts described secondary cooling zone through the NO.2 cooling blower material in this secondary cooling zone is cooled off
3) between described three cold sections upper cover and described one cold section, a cold but pipeline is set, in this cold but pipeline, the NO.1 cooling blower is set, described three cold sections upper cover waste gas blasts one cold section through the NO.1 cooling blower material in this cold section is cooled off the hot waste gas circulation UTILIZATION OF VESIDUAL HEAT IN that realization should be discharged.
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| CN104748558B (en) * | 2013-12-27 | 2017-01-18 | 中冶长天国际工程有限责任公司 | Tailing preheating device of reduction kiln |
| CN109141028B (en) * | 2017-06-16 | 2020-07-03 | 中冶长天国际工程有限责任公司 | Grate-rotary kiln pellet low NOxProduction device and pellet production method |
| CN109136544B (en) * | 2018-09-11 | 2020-07-03 | 中冶长天国际工程有限责任公司 | Grate-rotary kiln pellet low NOxProduction process and system thereof |
| CN109136545B (en) * | 2018-09-11 | 2020-07-03 | 中冶长天国际工程有限责任公司 | Grate-rotary kiln pellet low NOxProduction process and system thereof |
| CN109055721B (en) * | 2018-09-11 | 2020-07-03 | 中冶长天国际工程有限责任公司 | Grate-rotary kiln pellet low NOxProduction process and system |
| CN110068224B (en) * | 2019-06-05 | 2024-04-02 | 中冶北方（大连）工程技术有限公司 | Flue gas recycling and discharging system of air draft drying section and preheating section of chain grate machine |
| CN113188335B (en) * | 2021-04-22 | 2023-12-26 | 江苏省沙钢钢铁研究院有限公司 | Chain grate rotary kiln hot air system suitable for active coke desulfurization and denitrification process |
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| US6050813A (en) * | 1997-12-02 | 2000-04-18 | Cement Petcoptimizer Company | Control of cement clinker production by analysis of sulfur in the end product |
| CN101643836B (en) * | 2009-06-26 | 2011-10-05 | 中冶长天国际工程有限责任公司 | Pre-heating method of sulfate slag pellet ore |
| CN201508114U (en) * | 2009-06-26 | 2010-06-16 | 江苏大学 | Comprehensive residual heat-recycling hot air flow system for pellet production facilities |
| CN101624647B (en) * | 2009-08-04 | 2011-04-06 | 武汉钢铁(集团)公司 | Pellet roasting production technology recycling residual heat and system thereof |
| CN101900489B (en) * | 2010-09-08 | 2011-09-21 | 中冶北方工程技术有限公司 | Grate-kiln-circular cooler furnace drying device and furnace drying method thereof |
| CN102121786B (en) * | 2011-03-08 | 2012-03-28 | 中冶北方工程技术有限公司 | Hot air system of grate-rotary kiln-circular cooler |
| CN202149706U (en) * | 2011-07-15 | 2012-02-22 | 中冶北方工程技术有限公司 | Waste heat recycling system of grate-rotary kiln-circular cooler hot air system |
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