CN103264996B - Circulating fluidized bed boiler system for extraction of selenium from bone coal - Google Patents
Circulating fluidized bed boiler system for extraction of selenium from bone coal Download PDFInfo
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- CN103264996B CN103264996B CN201310155681.4A CN201310155681A CN103264996B CN 103264996 B CN103264996 B CN 103264996B CN 201310155681 A CN201310155681 A CN 201310155681A CN 103264996 B CN103264996 B CN 103264996B
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Abstract
The invention provides a circulating fluidized bed boiler system for extraction of selenium from bone coal. The circulating fluidized bed boiler system comprises a circulating fluidized bed boiler; a flue gas output of the circulating fluidized bed boiler is connected with high temperature dedusting equipment; a flue gas output of the high temperature dedusting equipment is connected with an input of an air preheater; an air inlet of the air preheater is connected with cold air, a hot air outlet of the air preheater is connected with an air inlet of the circulating fluidized bed boiler, and a flue gas output of the air preheater is connected with flue gas subsequent processing equipment through low temperature dedusting equipment; an ash outlet of the low temperature dedusting equipment is connected with a selenium extraction system; a coal economizer is arranged on at least one selected from the group consisting of a flue gas pipeline between the high temperature dedusting equipment and the air preheater and a flue gas pipeline between the circulating fluidized bed boiler and the high temperature dedusting equipment; and a water inlet of the coal economizer is connected with the water supply of the boiler, and a water outlet of the coal economizer is connected with a water inlet of the circulating fluidized bed boiler. The circulating fluidized bed boiler system provided by the invention greatly increases selenium content in fly ash of the selenium extraction system, reduces the amount of fly ash entering into the selenium extraction system and decreases investment in the selenium extraction system and cost for selenium extraction.
Description
Technical field
The present invention relates to heat power equipment and metallurgical technology field, be specifically related to a kind of circulating fluidized bed boiler systems of carrying selenium for bone coal.
Background technology
Bone coal is a kind of many metals symbiosis shale ore, distributed more widely in China.Bone coal both can be used as inferior fuel, also can therefrom mention multiple rare metal.According to various metal content differences in the bone coal of various places, can extract the element such as vanadium, selenium.The main associated minerals of China's enshi bone coal is selenium, and its content is 0.0275%, has reached associated minerals comprehensive utilization of resources grade requirement, and brick and tile clay is worth greatly.
If directly extract selenium from coal-fired flue-gas and flying dust, because bone coal calorific value is low, ash content is high, and the exhaust gas volumn that burning produces is large, and the ash amount that burning produces is large, makes the content of selenium in flue gas and ash content lower, makes that follow-up to carry need to investing of selenium system huge.
Summary of the invention
In order to overcome the shortcoming of above-mentioned prior art, the object of the present invention is to provide a kind of circulating fluidized bed boiler systems of carrying selenium for bone coal, significantly improve and enter selenium content in the flying dust of putting forward selenium system, reduce the flying dust amount of putting forward selenium system that enters, reduce and propose the investment of selenium system and carry selenium cost.
In order to achieve the above object, the present invention is achieved through the following technical solutions:
A kind of circulating fluidized bed boiler systems of carrying selenium for bone coal, comprise circular fluid bed 1, the input of circular fluid bed 1 is connected with the pipeline of coal supply, the slag output of circular fluid bed 1 is connected with slag removing system 6, the flue gas output of circular fluid bed 1 is connected with the input of high-temperature dust removal equipment 2, the flue gas output of high-temperature dust removal equipment 2 is connected with the input of air preheater 3, the ash output hole of high-temperature dust removal equipment 2 is connected with ash disposal system 7, the air intlet of air preheater 3 is connected with freezing air, the hot air outlet of air preheater 3 is connected with the inlet mouth of circular fluid bed 1, the flue gas output of air preheater 3 is connected with flue gas subsequent processing device 5 by low temperature dust removal installation 4, the ash output hole of low temperature dust removal installation 4 with put forward selenium system 8 and be connected,
On the flue gas pipeline between high-temperature dust removal equipment 2 and air preheater 3, or at least one place is provided with economizer 9 on the flue gas pipeline between circular fluid bed 1 and high-temperature dust removal equipment 2, economizer 9 water inlets are connected with oiler feed, and economizer 9 water outs are connected with the water inlet of circular fluid bed 1.
Described high-temperature dust removal equipment 2 adopts hot electrostatic precipitator 10 and high-temperature cyclone dust extractor 11, is arranged in flue-gas temperature higher than the high-temperature area of 315 DEG C, is that flying dust under fly-ash separator separates does not contain tin anhydride thereby make high temperature.
Described low temperature dust removal installation 4 adopts electric precipitator 12, sack cleaner 13 or electrostatic fabric filter 14, in the flying dust that tin anhydride is sublimated under separating in low temperature dust removal installation 4.
The present invention has mainly utilized the principle of tin anhydride 315 DEG C of distillations, improves and enters selenium content in the flying dust of putting forward selenium system.Detailed process is as follows, has produced a large amount of flue gases containing after selenium stone coal combustion, and selenium is oxidized to tin anhydride.When flue-gas temperature is during higher than 315 DEG C, the tin anhydride in flue gas is gaseous state feature, under this state, flue gas is carried out to high-temperature dust removal, and high-temperature dust removal equipment removes the flying dust getting off and do not contain tin anhydride.In the flue of downstream, arrange that again heating surface carries out cooling to flue gas.After flue gas cool-down is lower than 315 DEG C, tin anhydride is sublimated on low temperature flying dust.Adopt low temperature dust removal installation to separate the flying dust in flue gas, the low temperature flying dust that isolated selenium content is higher enters to be put forward selenium system and carries selenium again.
Relevant with the efficiency of high-temperature dust removal equipment containing selenium concentration in low temperature flying dust.High-temperature dust removal plant efficiency is higher, and after dedusting, in flue gas, flying dust amount is fewer.And under the condition of high temperature in flue gas tin anhydride content constant, these tin anhydride are sublimated in a small amount of flying dust under low-temperature condition, have so just improved and have entered the flying dust selenium content of putting forward selenium system.
The present invention also can use circular fluid bed the feature of low heat value bone coal and bone coal and put forward selenium system and combine.Can either utilize the heat of bone coal, can carry out high efficiency extraction to selenium in bone coal again, the lime-ash under high-temperature dust removal can also be used for building materials, realizes the comprehensive utilization of bone coal resource.
The present invention also can, according to the calorific value height situation of bone coal, determine and specifically enter boiler oil ature of coal.Can adopt to mix for the too low bone coal of calorific value and burn the higher fuel of thermal value, can feed separately and enter boiler for the higher bone coal of calorific value.
The present invention has utilized tin anhydride in high-temperature flue gas to be the feature of gaseous state, under the condition of high temperature, flue gas is carried out to pre-dedusting, in the ash that the condition of high temperature is removed like this, do not contain selenium element, tin anhydride is sublimated and is enriched in the flying dust that the cold precipitator in hot precipitator downstream separates, increase substantially the enrichment concentration of tin anhydride in flying dust, significantly reduce and carry selenium cost.The flying dust that cold precipitator separates is relevant with high-temperature dust removal equipment efficiency of dust collection containing selenium concentration.If the dust collector efficiency of hot precipitator reaches 90%, the flying dust selenium content of separating in cold precipitator improves 10 times, and the cost of putting forward selenium system reduces more than 50%.In the time that hot precipitator efficiency reaches 99.9%, the flying dust of separating in cold precipitator improves 100 times containing selenium concentration, and the cost of putting forward selenium system reduces more than 90%.
Brief description of the drawings
Fig. 1 is the structural representation of embodiment 1.
Fig. 2 is the structural representation of embodiment 2.
Fig. 3 is the structural representation of embodiment 3.
Fig. 4 is the structural representation of embodiment 4.
Fig. 5 is the structural representation of embodiment 5.
Embodiment
Below in conjunction with embodiment, the present invention is described in detail, following examples are used for illustrating the present invention, but it will be appreciated by those skilled in the art that all embodiment must not serve as limitation of the present invention.Any improvement of making within the scope of the invention or variation are all within protection scope of the present invention.
Embodiment 1
As shown in Figure 1, a kind of circulating fluidized bed boiler systems of carrying selenium for bone coal, comprise circular fluid bed 1, the input of circular fluid bed 1 is connected with the pipeline of coal supply, the slag output of circular fluid bed 1 is connected with slag removing system 6, the flue gas output of circular fluid bed 1 is connected with the input of high-temperature dust removal equipment 2, the flue gas output of high-temperature dust removal equipment 2 is connected with the input of air preheater 3, the ash output hole of high-temperature dust removal equipment 2 is connected with ash disposal system 7, the air intlet of air preheater 3 is connected with freezing air, the hot air outlet of air preheater 3 is connected with the inlet mouth of circular fluid bed 1, the flue gas output of air preheater 3 is connected with flue gas subsequent processing device 5 by low temperature dust removal installation 4, the ash output hole of low temperature dust removal installation 4 with put forward selenium system 8 and be connected,
Flue gas pipeline between described high-temperature dust removal equipment 2 and air preheater 3 is provided with economizer 9, and economizer 9 water inlets are connected with oiler feed, and economizer 9 water outs are connected with the water inlet of circular fluid bed 1.
The principle of work of the present embodiment is:
Bone coal fuel enters circular fluid bed 1 as coal supply and burns, and at the bottom of the macrobead that burning produces, slag is by discharging with the slag removing system 6 of boiler matching; The flue gas that burning produces enters high-temperature dust removal equipment 2, the flying dust separating of high-temperature dust removal equipment 2 enters ash disposal system 7, flue gas is lowered the temperature by economizer 9 heating surfaces that are arranged in flue, heat-eliminating medium in economizer 9 heating surfaces is oiler feed, and the feedwater after heating enters circular fluid bed 1.Flue gas after economizer 9 coolings enters air preheater 3, air in preheating of air 3 is boiler combustion air, air enters circular fluid bed 1 after flue gas heating, flue gas enters low temperature dust removal installation 4 after air preheater 3 is cooling, the flying dust that low temperature dust removal installation 4 separates enters the selenium system 8 of putting forward, and enters subsequent processing device 5 through the flue gas of low temperature dust removal installation 4.
Embodiment 2
As shown in Figure 2, on the basis of embodiment 1, high-temperature dust removal equipment 2 adopts hot electrostatic precipitator 10, is arranged in flue-gas temperature higher than the high-temperature area of 315 DEG C, is that flying dust under fly-ash separator separates does not contain tin anhydride thereby make high temperature; Low temperature dust removal installation 4 adopts electric precipitator 12, in the flying dust that tin anhydride is sublimated under separating in electric precipitator 12.
Embodiment 3
As shown in Figure 3, on the basis of embodiment 1, on the flue gas pipeline between circular fluid bed 1 and high-temperature dust removal equipment 2, be provided with economizer 9, economizer 9 water inlets are connected with oiler feed, and economizer 9 water outs are connected with the water inlet of circular fluid bed 1; High-temperature dust removal equipment 2 adopts hot electrostatic precipitator 10, is arranged in flue-gas temperature higher than the high-temperature area of 315 DEG C, is that flying dust under fly-ash separator separates does not contain tin anhydride thereby make high temperature; Low temperature dust removal installation 4 adopts sack cleaner 13, in the flying dust that tin anhydride is sublimated under separating in sack cleaner 13.
Embodiment 4
Shown in figure 4, on the basis of embodiment 1, remove the economizer 9 on the flue gas pipeline between high-temperature dust removal equipment 2 and air preheater 3, on the flue gas pipeline between circular fluid bed 1 and high-temperature dust removal equipment 2, be provided with economizer 9, economizer 9 water inlets are connected with oiler feed, and economizer 9 water outs are connected with the water inlet of circular fluid bed 1; High-temperature dust removal equipment 2 adopts hot electrostatic precipitator 10, is arranged in flue-gas temperature higher than the high-temperature area of 315 DEG C, is that flying dust under fly-ash separator separates does not contain tin anhydride thereby make high temperature; Low temperature dust removal installation 4 adopts electrostatic fabric filter 14, in the flying dust that tin anhydride is sublimated under separating in electrostatic fabric filter 14.
Embodiment 5
Shown in figure 5, on the basis of embodiment 1, on the flue gas pipeline between circular fluid bed 1 and high-temperature dust removal equipment 2, be provided with economizer 9, economizer 9 water inlets are connected with oiler feed, and economizer 9 water outs are connected with the water inlet of circular fluid bed 1; High-temperature dust removal equipment 2 adopts high-temperature cyclone dust extractor 11, is arranged in flue-gas temperature higher than the high-temperature area of 315 DEG C, is that flying dust under fly-ash separator separates does not contain tin anhydride thereby make high temperature; Low temperature dust removal installation 4 adopts sack cleaner 13, in the flying dust that tin anhydride is sublimated under separating in sack cleaner 13.
Claims (1)
1. carry the circulating fluidized bed boiler systems of selenium for bone coal for one kind, comprise circular fluid bed (1), it is characterized in that: the input of circular fluid bed (1) and the pipeline of coal supply are connected, the slag output of circular fluid bed (1) is connected with slag removing system (6), the flue gas output of circular fluid bed (1) is connected with the input of high-temperature dust removal equipment (2), the flue gas output of high-temperature dust removal equipment (2) is connected with the input of air preheater (3), the ash output hole of high-temperature dust removal equipment (2) is connected with ash disposal system (7), the air intlet of air preheater (3) is connected with freezing air, the hot air outlet of air preheater (3) is connected with the inlet mouth of circular fluid bed (1), the flue gas output of air preheater (3) is connected with flue gas subsequent processing device (5) by low temperature dust removal installation (4), the ash output hole of low temperature dust removal installation (4) with put forward selenium system (8) and be connected,
On the flue gas pipeline between high-temperature dust removal equipment (2) and air preheater (3), or at least one place is provided with economizer (9) on the flue gas pipeline between circular fluid bed (1) and high-temperature dust removal equipment (2), economizer (9) water inlet is connected with oiler feed, and economizer (9) water out is connected with the water inlet of circular fluid bed (1);
Described high-temperature dust removal equipment (2) adopts hot electrostatic precipitator (10) or high-temperature cyclone dust extractor (11), being arranged in flue-gas temperature higher than the high-temperature area of 315 DEG C, is that flying dust under fly-ash separator separates does not contain tin anhydride thereby make high temperature;
Described low temperature dust removal installation (4) adopts electric precipitator (12), sack cleaner (13) or electrostatic fabric filter (14), in the flying dust that tin anhydride is sublimated under separating in low temperature dust removal installation (4).
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| CN201310155681.4A CN103264996B (en) | 2013-04-28 | 2013-04-28 | Circulating fluidized bed boiler system for extraction of selenium from bone coal |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108679594A (en) * | 2018-04-17 | 2018-10-19 | 华电电力科学研究院有限公司 | Station boiler is adjustable high temperature dust pelletizing system and application process |
| CN111841065A (en) * | 2020-08-14 | 2020-10-30 | 中国华能集团清洁能源技术研究院有限公司 | Near-zero emission type integrated removal system and method for multiple pollutants in flue gas |
| CN115505759A (en) * | 2022-09-07 | 2022-12-23 | 北京华能长江环保科技研究院有限公司 | Fluidized bed system for comprehensive utilization of stone coal for extracting selenium and vanadium and comprehensive utilization method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN203222484U (en) * | 2013-04-28 | 2013-10-02 | 中国华能集团清洁能源技术研究院有限公司 | Circulating fluidized bed boiler structure for extracting selenium from stone coal |
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Patent Citations (6)
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| JP2005298925A (en) * | 2004-04-13 | 2005-10-27 | Ysk Techno System:Kk | Method for recovering vanadium compound from vanadium-containing matter |
| CN101717681A (en) * | 2009-11-25 | 2010-06-02 | 西安热工研究院有限公司 | Solid fuel upgrading reaction device and process thereof |
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