CN100518890C - Efficient desulfurizing and dust collecting process of boiler for circulating fluidized bed - Google Patents

Efficient desulfurizing and dust collecting process of boiler for circulating fluidized bed Download PDF

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CN100518890C
CN100518890C CN 200610116614 CN200610116614A CN100518890C CN 100518890 C CN100518890 C CN 100518890C CN 200610116614 CN200610116614 CN 200610116614 CN 200610116614 A CN200610116614 A CN 200610116614A CN 100518890 C CN100518890 C CN 100518890C
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desulfurization
dust
column
flue gas
fluidized bed
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CN 200610116614
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CN1939571A (en )
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房靖华
李春萱
杨天徐
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上海中芬电气工程有限公司
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本发明为一种循环流化床锅炉高效脱硫除尘工艺,包括炉内喷石灰石粉脱硫,尾部静电(布袋)除尘,其特征在于:还包括喷水雾化脱硫除尘塔,实现脱硫和除尘均采用两级处理的方法,即是两级脱硫和两级除尘,所述的两级脱硫是炉内喷石灰粉脱硫后尾部烟道设有喷雾塔进行喷水活化脱硫;所述的两级除尘是尾部烟道喷雾塔中对烟气喷水雾化除尘和尾部静电/布袋除尘器除尘。 The present invention is a circulating fluidized bed boiler desulfurization efficiency dust removal process, comprising a desulfurization furnace injection of limestone powder, electrostatic tail (bag) dust, characterized in that: further comprising a water atomizer dust desulfurization tower, are used to achieve desulfurized and dedusted the method of two-stage processing, that is, two and two desulphurization dust, after the two desulfurization furnace desulfurization lime powder injection backpass a spraying tower water desulfurization; two said dedusting is backpass spraying tower flue gas dust removal spray atomization and electrostatic tail / bag filter dust. 本发明将喷水雾化脱硫除尘塔与炉内喷钙和除尘器组合在一起,实现低成本高效脱硫除尘。 The present invention is spray atomized dust desulfurization tower with limestone injection and filter in combination, to achieve cost efficient desulfurization dust. 本发明保持了干法脱硫低成本无腐蚀的基本优点,但脱硫效率可达90~95%,接近或达到湿法脱硫的高水平,适用于大中型电站和工业循环流化床锅炉的脱硫和除尘。 The present invention substantially maintains the advantages of the dry desulfurization of low-cost corrosion-free, but desulfurization efficiency of up to 90 ~ 95%, close to or achieve a high level of wet desulfurization, for medium to large power plants and industrial and circulating fluidized bed boiler desulfurization dust.

Description

循环流化床锅炉高效脱硫除尘工艺 Circulating fluidized bed boiler desulfurization efficiency dust removal process

技术领域: FIELD:

本发明公开一种循环流化床锅炉高效脱硫除尘工艺,属于大气环境保护领域,适用于大中型电站和工业循环流化床锅炉的脱硫和除尘。 The present invention discloses a circulating fluidized bed boiler desulfurization efficiency dust removal process, the atmosphere is in the field of environmental protection, suitable for medium-sized power plants and desulfurized and dedusted industrial circulating fluidized bed boiler.

背景技术: Background technique:

循环流化床锅炉(Circulating Fluidized Bed Boiler—CFBB)由于其低温强化燃烧的特性, 具有能燃用劣质燃料,易于低成本脱硫,氮氧化物排放低和灰渣便于利用等显著优点,被认为是资源综合利用和环境友好的燃煤热能动力设备。 Circulating fluidized bed boiler (Circulating Fluidized Bed Boiler-CFBB) because of its low enhanced combustion properties, can have inferior fuel burning, low cost easy desulfurization, nitrogen oxide emissions and ash utilization facilitates significant advantages, is considered comprehensive utilization of resources and environment-friendly coal-fired thermal power equipment. 在国家政策的鼓励下,近年来得到迅猛的发展。 Encouraged by the national policy in recent years has been the rapid development. 但是,在目前众多的实践中,有两个环境问题日益显现出来: 一是,主要由于国内锅炉设计的目标是燃烧效率,脱硫效率普遍达不到国外厂商和教科书上所说的90%, 大多数仅为70〜80%左右;二是,由于燃用高灰份的劣质燃料和脱硫石灰石粉的大量喷入, 现用的电除尘器效率不够高,使排尘浓度和总量均达不到要求。 However, many of the current practice, there are two environmental issues become increasingly apparent: First, due mainly target domestic boiler design is the combustion efficiency, desulfurization efficiency of said common foreign manufacturers and textbooks on less than 90% of large most only around 70~80%; Second, due to the high ash burning fuels and low-grade desulfurization is sprayed into a large amount of limestone powder, active ESP efficiency is not sufficiently high, and the total concentration of the exhaust dust is not reached to requirements.

目前循环流化床锅炉大都采用炉内加石灰石和尾部静电除尘的方法来控制烟气的排放,但其脱硫和除尘效均较率低,尤其是燃用中髙硫煤时,很难达到新的排放标准。 Most of the current circulating fluidized bed boiler furnace using the method of limestone and aft to control the electrostatic dust flue gas emissions, but its efficiency compared desulfurized and dedusted low, especially when burning sulfur in coal Gao, is difficult to achieve a new emissions standards.

发明内容: SUMMARY:

本发明所要解决的技术问题是克服现有技术的缺陷,公开一种循环流化床锅炉高效脱硫除尘工艺。 The present invention solves the technical problem to overcome deficiencies of the prior art, discloses a circulating fluidized bed boiler desulfurization efficiency dust removal process.

本发明是这样实现的: 一种循环流化床锅炉高效脱硫除尘工艺,包括炉内喷石灰石粉脱硫,尾部静电/布袋除尘,其特征在于:还包括喷水雾化脱硫除尘塔,实现脱硫和除尘均采用两级处理的方法,即是两级脱硫和两级除尘,所述的两级脱硫是炉内喷石灰粉脱硫 The present invention is implemented: one circulating fluidized bed boiler desulfurization efficiency dust removal process, comprising a desulfurization furnace limestone powder spray, electrostatic tail / dust bag, characterized by: further comprising a water atomizer dust desulfurization tower to achieve desulfurization and two removal treatment methods are used, i.e., two two-stage desulfurization and dust removal, desulfurization of the two furnace desulfurization lime powder injection

后尾部烟道设有喷雾塔进行喷水活化脱硫;所述的两级除尘是尾部烟道喷雾塔中对烟气喷 After backpass a spraying tower Desulfurization water; the two backpass dedusting flue gas discharge spray tower

水雾化除尘和尾部静电/布袋除尘器除尘。 Water spray and dust tail static / bag filter dust.

炉内喷石灰石脱硫和静电(布袋)除尘都是成熟的现有技术,本发明的关键是将喷水雾化脱硫除尘塔(简称雾化塔)与炉内喷石灰石粉和除尘器组合在一起,实现低成本高效 Limestone and electrostatic discharge furnace (bag) dust are mature prior art, the present invention is the critical water spray atomized dust desulfurization column (referred to as atomization tower) and the discharge furnace limestone powder and dust together and achieve cost-efficient

脱硫除尘。 Desulphurization and dust removal. 在雾化塔中,通过喷水雾化将炉内大量未反应的CaO活化成Ca(OH)2,并在接近烟气露点的温度下与S02继续反应,进一步提高脱硫效率;同时,喷水雾化使粉尘颗粒变大变重,在重力和离心力的作用下,有相当多的粉尘将落入塔底,可以大大减轻下游除尘器的负担,因此该雾化塔同时具有脱硫和除尘的作用。 In the spray tower, CaO in the furnace by water atomization activated to a large number of unreacted Ca (OH) 2, and the reaction was continued with S02 at a temperature close to the dew point of the flue gas, to further improve the desulfurization efficiency; the same time, water nebulization change into heavy dust particles, gravity and centrifugal force, there is considerable dust will fall into the bottom of the column, it can greatly reduce the burden on a downstream precipitator, so that the spray has the effect of simultaneous desulfurization column and dust .

3本发明的有益效果是:本发明将喷水雾化脱硫除尘塔与炉内喷钙和除尘器组合在一起, 实现低成本高效脱硫除尘。 Advantageous effects of three invention: The present invention will spray atomized dust desulfurization tower with limestone injection and filter together, achieve cost efficient desulfurization dust. 本发明保持了干法脱硫低成本无腐蚀的基本优点,但脱硫效率 The present invention substantially maintains the advantages of the dry desulfurization of low-cost corrosion-free, but desulfurization efficiency

可达90〜95%,接近或达到湿法脱硫的高水平,适用于大中型电站和工业循环硫化床锅炉的高效脱硫和除尘。 90~95% up to close to or to wet desulfurization high level, and efficient power plants for medium to large industrial dedusting and desulfurization circulating fluidized bed boiler.

附图说明: BRIEF DESCRIPTION OF:

图l是本发明的喷水雾化脱硫除尘塔结构图; 图2是本发明工艺流程装置图。 Figure l is a water spray atomized dust desulfurization tower configuration diagram of the present invention; Figure 2 is a process flow device of the present invention FIG.

图中:1、上升烟道;2、顶部烟气分配器;3、塔体;4、螺旋升降机构;5、空气雾化喷嘴;6、出口挡板;7、出口装置;8、石灰石粉喷射系统;9、雾化塔;10、静电除尘器;11、炉膛;12、分离器;13、对流烟道;14、烟囱。 In FIG: 1, rising flue; 2, the top of the flue gas distributor; 3, tower; 4, lifting mechanism; 5, air atomizing nozzles; 6, exit baffle; 7, outlet means; 8, limestone injection system; 9, atomizing tower; 10, electrostatic precipitator; 11, furnace; 12, a separator; 13, convection pass; 14, chimney.

具体实施方式: detailed description:

根据附图1,本实用新型雾化塔,由上升烟道1、顶部烟气分配器2、塔体3、与水管连接的螺旋升降机构4空气雾化喷嘴5、位于塔底部侧壁的出口档板6和出口装置7 组成。 1 of the drawings, the present invention spray tower, by the rising flue 1, a top flue gas distributor 2, 3 tower, lifting mechanism 4 connected to the water and air atomizing nozzle 5 at the bottom outlet of the column sidewall baffle means 6 and outlet 7 composition.

根据附图2,本发明工艺雾化塔9炉内釆用现有技术石灰石粉喷射系统8和静电(或布袋)除尘器10结合脱硫。 2 of the drawings, the process of the present invention, the atomization tower 9 preclude the use of prior art furnace limestone injection systems 8 and an electrostatic (or bag) filter 10 in combination desulfurization. 雾化塔同时兼有脱硫和除尘的作用,因此本发明组合工艺实现了两级脱硫和两级除尘,可满足锅炉烟气排放的要求。 Atomizing effect with both column desulfurized and dedusted in, the process of the present invention is therefore to achieve a combination of two two desulfurization and dust removal, flue gas emissions to meet the requirements of the boiler. 在喷雾塔中,通过烟气分配器将烟气分成若千股,并将空气雾化喷嘴分别安置在其中,并通过螺旋升降机构调节其相对位置,使烟气与水雾充分混合而不湿壁。 In a spray tower, the flue gas by the flue gas into the dispenser if thousand shares, respectively, and the air atomizing nozzle disposed therein, and adjusting their relative position by the lifting mechanism, the flue gas does not wet with an aqueous spray mix wall. 水雾将烟气冷却的同时,使在炉内大量未反应完全的CaO活化成Ca(OH)2,在接近烟气露点的温度下继续与烟气中残留的S02反应,进一步提高脱硫效率;同时,大量的水雾使粉尘颗粒变大变重,在重力和离心力的作用下,相当多的粉尘将落入塔底被排出,可大大减轻下游除尘器的负担。 Mist while cooling the flue gas, a large amount of unreacted CaO is completely activated to Ca (OH) 2, to continue the flue gas remaining in the reaction with S02, to further improve the desulfurization efficiency of the flue gas at a temperature near the dew point in the furnace; Meanwhile, a large amount of dust particles change into mist so heavy, gravity and centrifugal force, the dust will fall considerably more bottoms to be discharged, can greatly reduce the burden on a downstream precipitator. 本发明采用的空气雾化喷嘴为市售产品,不处不作详述。 Air-atomizing nozzle is employed in the present invention is a commercial product, not the not detailed.

在投资和运行成本经济性上,本方案是十分优越的。 In terms of investment and operating costs economy, this program is very advantageous. 前面提到过,循环流化床锅炉炉内喷石灰石脱硫是所有脱硫工艺中最经济的。 As mentioned earlier, circulating fluidized bed boiler limestone injection desulfurization limestone desulfurization process is all in the most economical. 投资上,它只需一套石灰石输送和喷射装置, 效率可达70〜80%左右。 Investment, it is only a limestone injection and conveying means, efficiency up to 70~80%. 但如使用含硫较高的燃料或脱硫效率要求90%或以上时,则需增加一套简易喷水雾化装置。 However, when using high sulfur fuel such as desulfurization efficiency requirements or 90% or more, increase the ease of a water atomizing device. 由于不设灰循环和取消烟气再加热,简化的喷雾塔及其辅助系统的成本也较低。 Since ash does not cancel the cycle and reheating the flue gas, the cost of a simplified spray tower and its auxiliary system is also low. 除尘器仍然用原设计的静电除尘器(也可将其最后一个电场改为布袋)。 Electrostatic precipitator dust still with the original design (which can also be changed to the last field bag). 这样,新的高效脱硫除尘工艺的总投资低于湿法的三分之一。 Thus, the total investment of the new process is efficient desulfurization and dedusting of less than one third of the wet. 石灰石是各种脱硫剂中最便宜的,虽然流化床锅炉的石灰石消耗量是湿法的两倍多,但因工艺简单,能耗小,不腐蚀, Limestone is a variety of sorbent cheapest, although the consumption of limestone fluidized bed boiler is more than twice the wet, but the process is simple, low energy consumption, corrosion,

不设烟气再加热系统(GGH),没有废水,干灰易于处理等优点,运行成本低于湿法的二分之一,而且可靠性和寿命有显著的提高。 No flue gas reheating system (of GGH), no waste water, dry ash advantages of easy handling, operating costs are lower than one-half the wet process, and the reliability and life improved significantly. 由于不设雾化塔底灰和电除尘灰的循环系统,该活化塔可以看成是一级喷水增湿除尘装置。 As there is no bottom ash and atomizing electrostatic precipitator ash circulation system, the activator column can be considered as a water spray dust removing device. 喷出的水雾可增大粉的尘颗粒和重量,在重力和离心力的作用下,有相当多粉尘降落入塔底,可显著降低静电除尘器的入口粉尘浓度。 Atomized mist particles and dust may increase the weight of the powder, under the action of centrifugal force and gravity, there is considerable dust falling into the bottom of the column, it can significantly reduce the dust concentration in the inlet of the electrostatic precipitator. 此外,由于烟气温度的降低和灰尘含湿量增加,也有利于静电除尘器的效率提高。 Further, since the dust and the moisture content decreased to increase the temperature of flue gas, but also conducive to increase the efficiency of the electrostatic precipitator. 因而, 本方案有进一步降低烟尘排放浓度的良好效果。 Accordingly, the present embodiment further reduce the concentration of dust emissions good results.

本发明工艺适用于燃用中高硫(S大于1.0。/。)煤,或者脱硫效率要求大于90%的大中型循环流化床锅炉。 The present invention is applicable to fuel the process (S greater than 1.0./.) Using high sulfur coal, medium-sized or desulfurization efficiency of circulating fluidized bed boiler requires greater than 90%.

综上所述,本循环流化床锅炉脱硫除尘组合新工艺,能以干法的低投资和低运行成本达到高效脱硫和除尘的效果。 In summary, the circulating fluidized bed boiler desulphurization combination of new technology, can achieve efficient desulfurization and dust removal in a low investment cost and low operating a dry process.

Claims (3)

  1. 1. 一种循环流化床锅炉脱硫除尘工艺,包括炉内喷石灰石粉脱硫、尾部静电或布袋除尘设备和雾化塔(9),实现炉内喷石灰石粉脱硫与设置在尾部烟道的雾化塔(9)的喷水活化脱硫的两级脱硫以及设置在尾部烟道的雾化塔(9)对烟气喷水雾化除尘与尾部静电或布袋除尘设备除尘的两级除尘,其特征在于:所述的雾化塔(9)中,塔顶的顶部烟气分配器(2)形成若干分烟道,将烟气分成若干股从塔顶进入雾化塔(9),空气雾化喷嘴(5)分别安置在分烟道中心出口内,烟气与水雾在底部绕过位于雾化塔(9)底部塔侧壁上的出口挡板(6),从设于出口挡板(6)同侧侧壁上且位于其下侧的侧向的出口装置(7)排出雾化塔(9),在雾化塔(9)中,通过喷水雾化将炉内喷石灰石后大量未反应或者未反应完全的CaO活化成Ca(OH)2,并在接近烟气露点的温度下与SO2继续反应。 A circulating fluidized bed boiler desulphurization process, including furnace desulfurization limestone powder spraying, electrostatic or bag filter apparatus tail atomizing tower (9), to achieve desulfurization furnace limestone powder spray provided in the back pass desulfurization of the water column (9) and a set of two desulfurization (9) two column backpass dust atomizing spray of atomized dust flue gas or the tail electrostatic dust bag dust removal apparatus, wherein wherein: said spray tower (9), the top of the flue gas distributor overhead (2) form a plurality of sub-stack, the flue gas enters the spray tower is divided into a plurality of shares (9) from the top, air atomization a nozzle (5) are respectively disposed within the divided flue outlet center, smoke and mist atomizing is located at the bottom of column bypass (9) the outlet plate (6) on the bottom side of the column, provided in the outlet plate ( after a large number of 6) and the outlet means positioned laterally on its underside (7) discharging atomization column (9) on the same side of the side wall, in the atomization column (9), by atomizing water in the furnace limestone injection unreacted CaO or completely activated to unreacted Ca (OH) 2, and SO2 and the reaction was continued at a temperature close to the dew point of the flue gas.
  2. 2. 根据权利要求1所述的循环流化床锅炉脱硫除尘工艺,其特征在于:所述顶部烟气分配器(2)将顶部来的烟气分成3〜12股,在每个分烟道设置的空气雾化喷嘴(5)的连接管上还设置有螺旋升降机构(4)。 The circulating fluidized bed boiler desulphurization process according to claim 1, wherein: the top of the flue gas distributor (2) to the top of the flue gas into 3~12 Unit, in each sub-stack It is also provided with a lifting mechanism (4) air atomizing nozzle (5) is provided a connecting pipe.
  3. 3. 根据权利要求1或2所述的循环流化床锅炉脱硫除尘工艺,其特征在于:所述的雾化塔(9)塔底部侧壁设有出口挡板(6),在重力和离心力的作用下,相当多的粉尘降落入塔底被排出。 The circulating fluidized bed boiler desulphurization process of claim 1 or claim 2, wherein: said atomizing column (9) is provided with a bottom outlet baffle sidewall column (6), in gravity and centrifugal force under the action, a considerable amount of dust falling into the bottoms discharged.
CN 200610116614 2006-09-28 2006-09-28 Efficient desulfurizing and dust collecting process of boiler for circulating fluidized bed CN100518890C (en)

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CN101259365B (en) 2008-04-25 2010-10-06 武汉凯迪电力环保有限公司 Two-stage pre-spraying water circulating fluidized bed desulfurization technique and system thereof
CN101698135B (en) 2009-10-29 2012-10-03 北京绿源润泽环境技术有限责任公司 Composite slaked lime desulfurizing method and device thereof
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