CN1067302A - 开发利用高含硫量燃料的方法和装置 - Google Patents
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Abstract
本发明公开了一种燃烧高含硫量燃料的方法,该
燃料在存在含大量碳酸钙的油页岩条件下进行燃烧,
从而使硫和碳酸钙氧化,反应生成了捕获燃料中硫的
硫酸钙颗粒,防止将硫排放到大气中去。
Description
本发明涉及一种开发利用高含硫量燃料、尤其是开发利用高含硫量的方法和设备。
环境条件限制了高含硫量燃料、尤其是高含硫量油的使用。大容量发电站就属于这种情况,在这里不让使用高含硫量的燃料,以免燃烧这种燃料产生的硫的氧化物排放到大气中去。大气中存在硫的氧化物是形成酸雨的主要原因,在大气中的水份凝结期间此氧化物溶于其中,酸雨就降落到地面。在世界上许多地方很大地区遭受到酸雨带来的不利影响。问题如此严重,以致国际上正致立于改善此问题。
解决酸雨在其影响区对蔬菜、建筑物、交通工具和人们造成不利影响的一个办法是要求发电站燃烧低含硫量的燃料,如低含硫量油。本来低硫燃料的需求量就大,这样一来更增加了其耗量,由于低含硫量的燃料(尤其是原油)的贮存量以及它们的制品是有限的,因而大增加了这些燃料的成本。因此,目前开采的原油中多半含硫量高,为利用这些原油作为燃料就需要采用成本高的精炼除硫手段生产出可供电站使用的低硫燃料。由于供应量的缺陷,这些原料很贵,而且其供应也不可靠。
另一种减少酸雨的途径是在发电站的烟道中配备成本高的湿式除尘器,从而允许使用高含硫量燃料,而同时可避免将硫化物排放到空气中。在这两种方案中的任何一种,减少酸雨所化的成本都是高的。
因此,本发明的目的是提供一种经济地开发利用高含硫量燃料(如油)的新方法,从而减少或者基本上防止将硫排到大气中。
按照本发明,高含硫量燃料在存在含大量碳酸钙的油页岩的条件下燃烧,从而硫和碳酸钙氧化,反应生成了已俘获燃料中硫的硫酸钙颗粒,防止将硫排放到大气中去。
燃烧高含硫量燃料的步骤为:高含硫量的燃料在存在含有大量硫酸盐(通常为碳酸钙)的低热值燃料的条件下或者与其一起进行燃烧。最好,在燃烧之前,将高含硫量燃料与含大量碳酸盐的燃料相混合,从而燃烧该混合物。碳酸钙与硫氧化,进行反应,使硫与钙相结合。
所发生的化学结合产生了硫酸钙,它是一种能被装在发电站烟道中的常规分离器带走或收集起来的颗粒材料,因而防止将硫化物排入大气。
代替在一个单独的过程中制备CaCO或CaCO3以捕获燃烧过程中产生的硫,本发明在燃烧过程中直接利用含有大量碳酸钙的燃料,如油页岩。这样,可省去价格昂贵的制备过程。此外,根据本发明,由于油页岩与含高硫量燃料一起燃烧,油页岩本身能提供高于足以产生所需CaO的能量。
含碳酸盐的燃料可以是含有碳酸钙的油页岩。作为其替换物,该燃料可以是泥煤,或者是含有大量碳酸钙的低品质煤。
下面结合实施例和附图对本发明作详细的描述。
图1是本发明一个实施例的框图。
图2是将本发明装到电站中的另一实施例的框图。
图3是本发明又一实施例的框图。
一般来说,油页岩不是一种经济的燃料,尤其是在生产电能的大容量电站中。但是,这种燃料含有大量的碳酸钙和碳酸镁,它们对于吸收高硫燃料燃烧过程中的硫是很有用的。按照本发明,高含硫量的燃料(如电站中使用的普通残油)与低品质燃料(如油页岩)一起燃烧。通常,油页岩含有大量碳酸钙(有时直到60%)和一些碳酸镁。这样的高含硫量燃料常常含有8%的硫(按体积计)。
在燃烧过程中,钙与硫氧化,反应生成硫酸钙颗粒材料。钙与硫之间的化学反应可以按多种方式完成。例如:
这样形成的亚硫酸钙(CaSO3)通常按下述方式生成硫酸钙:
此外,硫酸盐还可以这样形成:
碳酸镁化合物也能形成一些硫酸盐。
借助于旋风分离器那样的通风装置,将这些颗粒材料从燃烧过程产生的烟气中分离出来。这样一来,虽然油页岩或者低品质燃料,通常不适宜用作大容量发电站的燃料,然而当这些燃料与通常的高含硫量燃料(如残油)一起燃烧,能产生足够的热量供大容量电站利用。低品质燃料与高含硫量燃料的结合允许使用高含硫量的燃料而不需要设置单独使用高含硫量燃料所必备的湿式除尘器和分离器。
现在参看附图,图1中的附图标记10表示按照本发明方法在存在油页岩那样的低品质燃料条件下燃烧残油那样的高含硫量燃料的设备。高含硫量燃料通过入口15送到燃烧室20,含大量碳酸钙的低品质燃料通过入口25送到燃烧室20。作为在燃烧室20中发生的燃烧过程的结果,低品质燃料中的碳酸钙与高含硫量燃料中的硫反应,生成颗粒状的硫酸钙。这些颗粒可以借助于分离装置35从通过烟囱30的烟气中分离出来,这些分离装置可以是一个旋流分离器、湿式除尘器等。
现在来看图2,本发明的一个实施例表示为设备50,它包括通用的分馏装置52,在该分馏装置中,高硫原油按常规过程脱硫,产生低硫油和其它馏分,以及少量的(典型情况是5%)高含硫量的残油。该残油可以在发电站60中燃烧而不向大气排放硫,这是按下述方法实现的,首先在混合器54中将高硫残油与油页岩那样的含大量碳酸钙的低品质燃料相结合,然后将混合物送到锅炉56的燃烧室中,在那里进行燃烧。如前面所述的那样,燃烧过程使钙与硫氧化,然后反应生成了硫酸钙颗粒材料,这些颗粒材料能借助于通用的分离器57从烟气中分离出来。烟气流过烟囱58,而颗粒从分离器收集起来。
锅炉56产生的蒸汽用来驱动汽轮机61,经发电机62产生电能。消耗掉热量的蒸汽在冷凝器63中凝结,产生的凝结液借助于循环泵64再送回到锅炉中。
当残油或液体燃料与含碳酸钙的燃料一起燃烧时,燃烧最好在如图3附图标记70所示的两级系统中完成。系统70的室72是一个热解室,在混合器74中完成混合之后的油页岩和高含硫量燃料的混合物在那里进行热解。室72产生可燃气和含碳残余物。室72所产生的残余物与过量空气在系统70的室76中燃烧。碳酸钙与在室72中完成的热解过程中所产生的灰和硫的氧化物一起送往室76,在那里碳酸钙和硫的氧化物反应生成硫酸钙。在室76中生成的燃烧产物送到分离器77,该分离器从燃烧产物中分离出热粗灰。至少将此热粗灰中的一部分送到热解室72以提供完成热解所必需的热量。室76中的过量空气被加热,并且与燃烧产物和细灰一起,以及来自室72的可燃气送到燃烧室78,该燃烧室可以是图2所示锅炉的一部分。
上述描述中,低品质燃料以油页岩为例,但是根据本发明,也可以采用泥煤以及含碳酸钙的低品质煤,在存在残余燃料油这样的高含硫量燃料的条件下进行燃烧,按类似于上面描述的方式生硫酸钙。泥煤和低品质煤通常含有少量的硫以及相对高含量的碳酸钙。因而本发明提供了一种实用的方法,从而可经济地利用这类相当丰富的天然资源作为燃料。
此外,上面描述中高含硫量燃料以残油为例,但本发明还有可能利用其它的高含硫量燃料,如高含硫量的煤,若不采用本发明,这种煤不能用作生态资源。采用本发明的方法和设备,这样的煤可与低含硫量燃料一起燃烧,从而低含硫量燃料中的碳酸钙能将煤中的硫转换成颗粒状硫酸钙。由于能使高含硫量燃料广泛地使用而不增加污染水平,就对减少酸雨产生十分有利的影响。
从上面对本发明最佳实施例的描述可以明显地看出本发明的方法和设备所带来的优点和改进效果。可以如权利要求书所描述的那样进行各种变化,这仍落在本发明的构思和范围之中。
Claims (11)
1、燃烧高含硫量燃料的方法,其特征在于:在存在含大量碳酸钙的油页岩的条件下燃烧上述高含硫量燃料,从而使硫和碳酸钙氧化,反应生成硫酸钙。
2、按照权利要求1所述的方法,其特征在于:该方法还包含了使高含硫量燃料在燃烧之前与油页岩相混合的步骤。
3、按照权利要求1所述的方法,其特征在于:所述燃烧产生了含有硫酸钙颗粒的烟气,该方法在将烟气排至大气之前还包括一个将上述颗粒从烟气中分离出来的步骤。
4、利用高硫原油的方法,它包括下述步骤:
a)加工上述原油,得到至少一种基本上不含硫的化合物以及富硫化合物;
b)将富硫化合物与含碳酸钙的油页岩相混合,得到一种混合物;和
c)燃烧此混合物,从而使钙和硫氧化,反应生成一种硫与钙相结合的颗粒。
5、按照权利要求4所述的方法,其特征在于:混合物燃烧生成了含有上述颗粒的烟气,该方法在将烟气排至大气之前还包含了一个将这些颗粒从烟气中分离出来的步骤。
6、燃烧高含硫量燃料的设备,它包括:
a)燃烧上述高含硫量燃料的装置,将上述燃料在存在含大量碳酸钙的油页岩的条件下进行燃烧,从而硫与碳酸钙氧化,反应生成硫酸钙与热气体;
b)将硫酸钙从上述烟气中分离出来的装置。
7、按照权利要求6所述的设备,其特征在于:它还包括了利用上述热气体来发电的装置。
8、一种设备,它包括:
a)将高硫量燃料与油页岩相混合形成混合物的装置;
b)热解上述混合物产生可燃气和含碳残余物的热解室;
c)接受上述含碳残余物,并将其与过量空气反应生成燃烧产物的室,该燃烧产物是热气和颗粒状硫酸钙的混合物;和
d)燃烧上述可燃气的装置。
9、按照权利要求8所述的设备,其特征在于:它还包括一个使热颗粒从上述燃烧产物中分离出来的分离器以及将所述颗粒送至所述热解室的装置。
10、按照权利要求1所述的方法,其特征在于:它还包括有一个热解高含硫量燃料和油页岩的混合物,以形成可燃气和含碳残余物的步骤,在这之后再燃烧此残余物。
11、按照权利要求10所述的方法,其特征在于:它还包括了从上述燃料在存在油页岩条件下燃烧而得到的燃烧产物中分离出热颗粒的步骤,以及在上述热解步骤中至少利用上述热颗粒中的一部分。
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
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US68369091A | 1991-04-11 | 1991-04-11 | |
US683,690 | 1991-04-11 | ||
US83535892A | 1992-02-14 | 1992-02-14 | |
US835,358 | 1992-02-14 |
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CN1067302A true CN1067302A (zh) | 1992-12-23 |
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US (1) | US5571490A (zh) |
CN (1) | CN1067302A (zh) |
BR (1) | BR9201358A (zh) |
CS (1) | CS110092A3 (zh) |
EE (1) | EE9400187A (zh) |
IL (1) | IL101531A (zh) |
MA (1) | MA22504A1 (zh) |
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1992
- 1992-04-08 IL IL10153192A patent/IL101531A/en not_active IP Right Cessation
- 1992-04-10 CS CS921100A patent/CS110092A3/cs unknown
- 1992-04-10 MA MA22786A patent/MA22504A1/fr unknown
- 1992-04-11 CN CN92102936A patent/CN1067302A/zh active Pending
- 1992-04-13 BR BR929201358A patent/BR9201358A/pt not_active IP Right Cessation
-
1994
- 1994-02-17 US US08/197,551 patent/US5571490A/en not_active Expired - Fee Related
- 1994-11-18 EE EE9400187A patent/EE9400187A/xx unknown
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103534338A (zh) * | 2011-03-18 | 2014-01-22 | 埃克洛普有限公司 | 从油砂和/或油页岩连续获得合成气的方法 |
CN103547657A (zh) * | 2011-03-18 | 2014-01-29 | 埃克洛普有限公司 | 用于能量有效且环境友好地从来自油页岩和/或油砂的粗沥青提取轻油和/或燃料的方法 |
Also Published As
Publication number | Publication date |
---|---|
IL101531A (en) | 1996-10-31 |
BR9201358A (pt) | 1992-12-01 |
CS110092A3 (en) | 1992-10-14 |
US5571490A (en) | 1996-11-05 |
MA22504A1 (fr) | 1992-12-31 |
EE9400187A (et) | 1996-02-15 |
IL101531A0 (en) | 1992-12-30 |
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