CN101117247A - Layout method of flue gas desulfurization wastewater cyclone separation system - Google Patents
Layout method of flue gas desulfurization wastewater cyclone separation system Download PDFInfo
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- 239000002351 wastewater Substances 0.000 title claims abstract description 141
- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000000926 separation method Methods 0.000 title claims abstract description 16
- 238000006477 desulfuration reaction Methods 0.000 title abstract description 15
- 230000023556 desulfurization Effects 0.000 title abstract description 15
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title description 7
- 239000003546 flue gas Substances 0.000 title description 7
- 230000003068 static effect Effects 0.000 claims abstract description 13
- 239000011505 plaster Substances 0.000 claims 6
- 210000002966 serum Anatomy 0.000 claims 6
- 239000002002 slurry Substances 0.000 abstract description 46
- 239000010440 gypsum Substances 0.000 abstract description 45
- 229910052602 gypsum Inorganic materials 0.000 abstract description 45
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 6
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000010521 absorption reaction Methods 0.000 description 5
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 238000004065 wastewater treatment Methods 0.000 description 3
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 235000019738 Limestone Nutrition 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
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Abstract
本发明涉及脱硫系统中一种废水旋流分离系统的布置方法。其特征是当石膏浆液旋流器溢流与废水旋流器入口标高之差产生的静压能克服废水旋流器入口压力与管道水头损失之和时，撤去废水给料箱、废水给料泵；当石膏浆液旋流器溢流与废水旋流器入口标高之差产生的静压不能克服废水旋流器入口压力与管道水头损失之和时，将废水给料箱与石膏浆液旋流器溢流相连布置在同一高标高楼层，废水给料泵和废水旋流器布置在同一低标高楼层；或将石膏浆液旋流器、废水给料箱、废水给料泵依次相连布置在同一高标高楼层，再连接布置在低标高搂层的废水旋流器。其有益效果是简化设计，降低设备投资和运行成本。The invention relates to an arrangement method of a wastewater cyclone separation system in a desulfurization system. It is characterized in that when the static pressure generated by the difference in elevation between the overflow of the gypsum slurry cyclone and the inlet of the waste water cyclone can overcome the sum of the inlet pressure of the waste water cyclone and the loss of pipeline water head, the waste water feed tank and the waste water feed pump are removed ; When the static pressure produced by the difference in elevation between the overflow of the gypsum slurry cyclone and the inlet of the waste water cyclone cannot overcome the sum of the inlet pressure of the waste water cyclone and the loss of pipeline water head, the waste water feeding box and the overflow of the gypsum slurry cyclone Flow-connected arrangement on the same high-level floor, waste water feed pump and waste water cyclone are arranged on the same low-level floor; or gypsum slurry cyclone, waste water feed tank, waste water feed pump are arranged in sequence on the same high-level floor , and then connected to the waste water cyclone arranged in the low-elevation layer. The beneficial effect is to simplify the design, reduce equipment investment and operation cost.
Description
技术领域technical field
本发明涉及烟气脱硫领域，特别涉及脱硫系统中一种废水旋流分离系统的布置方法。The invention relates to the field of flue gas desulfurization, in particular to a method for arranging a wastewater cyclone separation system in a desulfurization system.
背景技术Background technique
石灰石(石灰/电石渣)-石膏湿法烟气脱硫技术是当今国内外应用最广泛的烟气脱硫技术，国内应用市场95％以上。脱硫系统运行过程中，由于脱硫剂和烟气的携带，一些惰性物质、氯离子等杂质会进入脱硫系统。当惰性物质浓度超出脱硫装置的耐受程度时，会影响脱硫剂浆液对SO2的吸收，导致脱硫效率降低；当氯离子浓度超过一定的限制时，会加速脱硫设备的腐蚀，还会影响石膏的品质。因此，必须采取各种方式将吸收塔浆池中的惰性物质和氯离子浓度控制在一定范围内。废水旋流分离系统通过对石膏浆液旋流器的溢流进行二次分离排放废水，起到降低吸收塔浆液池内氯离子浓度和惰性物质含量的目的。Limestone (lime/carbide slag)-gypsum wet flue gas desulfurization technology is the most widely used flue gas desulfurization technology at home and abroad, with more than 95% of the domestic application market. During the operation of the desulfurization system, some inert substances, chloride ions and other impurities will enter the desulfurization system due to the carrying of the desulfurization agent and flue gas. When the concentration of inert substances exceeds the tolerance of the desulfurization device, it will affect the absorption of SO2 by the desulfurizer slurry, resulting in a decrease in desulfurization efficiency; when the concentration of chloride ions exceeds a certain limit, it will accelerate the corrosion of desulfurization equipment and affect the gypsum quality. Therefore, various methods must be adopted to control the concentration of inert substances and chloride ions in the slurry tank of the absorption tower within a certain range. The wastewater cyclone separation system performs secondary separation and discharge of wastewater on the overflow of the gypsum slurry cyclone, so as to reduce the concentration of chloride ions and the content of inert substances in the slurry pool of the absorption tower.
脱硫系统中，吸收塔浆池内的石膏浆液排出流程为石膏浆排出泵→石膏浆液缓冲箱→石膏浆中间泵→石膏浆液旋流器。石膏浆液旋流器布置在真空皮带脱水机上层，石膏浆液经石膏浆液旋流器分离后的底流自流进入真空皮带脱水机脱水后得到副产品石膏，而溢流则进入废水旋流分离系统，经废水旋流分离系统分离后得到约1％的溢流和约10％的底流，1％的溢流经过废水箱收集再经废水泵提升输送到废水处理站进行处理，10％的底流则返回吸收塔。In the desulfurization system, the gypsum slurry discharge process in the absorption tower slurry tank is gypsum slurry discharge pump → gypsum slurry buffer tank → gypsum slurry intermediate pump → gypsum slurry cyclone. The gypsum slurry cyclone is arranged on the upper layer of the vacuum belt dehydrator. The underflow of the gypsum slurry separated by the gypsum slurry cyclone flows into the vacuum belt dehydrator to obtain the by-product gypsum, and the overflow enters the waste water cyclone separation system. After separation by the cyclone separation system, about 1% of the overflow and about 10% of the underflow are obtained. The 1% of the overflow is collected by the waste water tank and then transported to the wastewater treatment station by the waste water pump for treatment. The 10% of the underflow is returned to the absorption tower.
传统的废水旋流分离系统的工艺流程是：石膏浆液旋流器溢流→废水给料箱→废水给料泵→废水旋流器→废水箱→废水处理。传统的废水旋流系统布置方法是：不去计算石膏浆液旋流器溢流与废水旋流器入口标高之差产生的静压与废水旋流器入口压力与管道水头损失之和之间的关系，直接将废水给料箱、废水给料泵、废水旋流器布置在同一层，石膏浆液旋流器的溢流通过废水给料箱缓冲，再由废水给料泵升压后进入废水旋流器进行固液分离，分离后的废水旋流器的溢流自流进入废水箱，再送至废水处理站进行处理。目前国内外均采用此种传统工艺，这种工艺存在工艺设计较为复杂，废水旋流系统设备投资较大、运行成本较高等缺点。The process flow of the traditional wastewater cyclone separation system is: gypsum slurry cyclone overflow→wastewater feed tank→waste water feed pump→waste water cyclone→waste water tank→waste water treatment. The traditional layout method of the wastewater cyclone system is: not to calculate the relationship between the static pressure generated by the difference between the overflow of the gypsum slurry cyclone and the elevation difference between the inlet of the wastewater cyclone and the sum of the inlet pressure of the wastewater cyclone and the head loss of the pipeline , directly arrange the waste water feed box, waste water feed pump, and waste water cyclone on the same floor, the overflow of the gypsum slurry cyclone is buffered by the waste water feed tank, and then enters the waste water cyclone after being boosted by the waste water feed pump Solid-liquid separation is carried out by the device, and the overflow of the separated waste water cyclone flows into the waste water tank by itself, and then sent to the waste water treatment station for treatment. At present, this traditional process is used both at home and abroad. This process has disadvantages such as relatively complicated process design, large investment in wastewater cyclone system equipment, and high operating costs.
发明内容Contents of the invention
本发明的目的是提供一种能简化设计，降低设备投资和运行成本的废水旋流分离系统的布置方法。The object of the present invention is to provide an arrangement method of a wastewater cyclone separation system that can simplify design and reduce equipment investment and operating costs.
具体技术方案如下：The specific technical scheme is as follows:
一种废水旋流分离系统的布置方法，包括布置在高标高的石膏浆液旋流器溢流和布置在低标高的废水旋流器及连接两者之间的废水给料箱、废水给料泵，其特征是当石膏浆液旋流器溢流与废水旋流器入口标高之差产生的静压能克服废水旋流器入口压力与管道水头损失之和时，撤去废水给料箱、废水给料泵，将石膏浆液旋流器溢流与废水旋流器直接相连；当石膏浆液旋流器溢流与废水旋流器入口标高之差产生的静压不能克服废水旋流器入口压力与管道水头损失之和时，将废水给料箱与石膏浆液旋流器溢流相连布置在同一高标高楼层，废水给料泵和废水旋流器布置在同一低标高楼层，废水给料泵连接废水给料箱和废水旋流器；或将石膏浆液旋流器、废水给料箱、废水给料泵依次相连布置在同一高标高楼层，再连接布置在低标高搂层的废水旋流器。A method for arranging a wastewater cyclone separation system, including a gypsum slurry cyclone overflow arranged at a high elevation, a wastewater cyclone arranged at a low elevation, and a wastewater feed tank and a wastewater feed pump connecting the two , which is characterized in that when the static pressure generated by the difference in elevation between the overflow of the gypsum slurry cyclone and the inlet of the waste water cyclone can overcome the sum of the inlet pressure of the waste water cyclone and the loss of pipeline water head, the waste water feed box and waste water feed are removed The pump directly connects the overflow of the gypsum slurry cyclone with the waste water cyclone; when the static pressure generated by the difference between the overflow of the gypsum slurry cyclone and the inlet elevation of the waste water cyclone cannot overcome the inlet pressure of the waste water cyclone and the water head of the pipeline When the sum is lost, the waste water feed tank is connected to the overflow of the gypsum slurry cyclone and arranged on the same high elevation floor, the waste water feed pump and the waste water cyclone are arranged on the same low elevation floor, and the waste water feed pump is connected to the waste water feed tank and waste water cyclone; or connect the gypsum slurry cyclone, waste water feed tank, and waste water feed pump in sequence on the same high-level floor, and then connect the waste water cyclone arranged on the low-level floor.
当石膏浆液旋流器溢流与废水旋流器入口两者标高之差产生的静压能克服废水旋流器入口压力与管道水头损失之和时，石膏浆液旋流器的溢流可以自流进入废水旋流器，这时可以撤去废水给料箱和废水给料泵两个设备，节约了废水给料箱和废水给料泵投资及废水给料泵运行费用。When the static pressure generated by the difference in elevation between the overflow of the gypsum slurry cyclone and the inlet of the waste water cyclone can overcome the sum of the inlet pressure of the waste water cyclone and the loss of pipeline water head, the overflow of the gypsum slurry cyclone can flow into the For the waste water cyclone, the waste water feeding tank and the waste water feeding pump can be removed at this time, which saves the investment in the waste water feeding tank and the waste water feeding pump and the operating cost of the waste water feeding pump.
当石膏浆液旋流器溢流与废水旋流器入口标高之差产生的静压不能克服废水旋流器入口压力与管道水头损失之和时，可以采取两种工艺布置：When the static pressure generated by the difference between the overflow of the gypsum slurry cyclone and the inlet elevation of the waste water cyclone cannot overcome the sum of the inlet pressure of the waste water cyclone and the head loss of the pipeline, two process arrangements can be adopted:
一种是将废水给料箱与石膏浆液旋流器布置在同一高标高楼层，废水给料泵和废水旋流器布置在同一低标高楼层，废水给料泵连接废水给料箱和废水旋流器；One is to arrange the waste water feeding box and the gypsum slurry cyclone on the same high-level floor, the waste water feeding pump and the waste water cyclone are arranged on the same low-level floor, and the waste water feeding pump is connected to the waste water feeding box and the waste water cyclone device;
另外一种是石膏浆液旋流器、废水给料箱、废水给料泵依次布置在同一高标高楼层，废水旋流器布置在低标高搂层。这两种布置方法都可以降低废水给料泵的扬程，从而降低废水旋流分离系统的运行成本。The other is that the gypsum slurry cyclone, waste water feed tank, and waste water feed pump are arranged sequentially on the same high-level floor, and the waste water cyclone is arranged on the low-level floor. Both of these arrangements can reduce the head of the wastewater feed pump, thereby reducing the operating cost of the wastewater cyclone separation system.
石膏浆液旋流器溢流与废水旋流器入口标高之差产生的静压，废水旋流器入口压力与管道水头损失都可以通过计算得到，并可在实地检测验证相关数据。The static pressure generated by the difference in elevation between the overflow of the gypsum slurry cyclone and the inlet of the wastewater cyclone, the inlet pressure of the wastewater cyclone and the head loss of the pipeline can all be calculated, and relevant data can be verified on site.
本发明通过实地检测和计算，判断石膏浆液旋流器溢流与废水旋流器入口标高之差产生的静压是否满足废水旋流器入口压力与管道水头损失之和，从而调节整个系统的布置，其有益效果是简化设计，降低设备投资和运行成本。The present invention judges whether the static pressure generated by the difference between the overflow of the gypsum slurry cyclone and the inlet elevation of the wastewater cyclone satisfies the sum of the inlet pressure of the wastewater cyclone and the head loss of the pipeline through on-the-spot detection and calculation, thereby adjusting the layout of the entire system , its beneficial effect is to simplify the design, reduce equipment investment and operating costs.
具体实施例(共2例)Specific embodiment (total 2 examples)
实施例1Example 1
2×600MW烟气脱硫装置中，传统的废水旋流分离系统布置是将石膏浆液旋流器布置在高标高楼层，废水给料箱、废水给料泵、废水旋流器布置在同一低标高楼层，石膏浆液旋流器溢流、废水给料箱、废水给料泵、废水旋流器入口的标高分别为38.5m、11.5m、11.5m、11.5m。石膏浆液旋流器溢流与废水旋流器入口的标高之差为27m，根据计算可知，该高差产生的静压可以克服废水旋流器入口压力与管道水头损失之和的要求。因此，按照本发明的新工艺布置，石膏浆液旋流器和废水旋流器保持不变，即石膏浆液旋流器布置在高标高楼层，废水旋流器布置在低标高楼层，而撤去废水给料箱和废水给料泵。这时，石膏浆液旋流器溢流的标高是38.5m，废水旋流器入口标高11.5m，石膏浆液旋流器的溢流将自流至废水旋流器。与传统工艺相比，按此新布置方法可节约废水给料箱和废水给料泵的投资费用约10万元，节约废水给料泵电耗约5kw/h。In the 2×600MW flue gas desulfurization unit, the traditional wastewater cyclone separation system layout is to arrange the gypsum slurry cyclone on the high-elevation floor, and the waste water feed tank, waste water feed pump, and waste water cyclone are arranged on the same low-elevation floor , The elevations of the overflow of the gypsum slurry cyclone, the waste water feed tank, the waste water feed pump, and the inlet of the waste water cyclone are 38.5m, 11.5m, 11.5m, and 11.5m, respectively. The elevation difference between the overflow of the gypsum slurry cyclone and the inlet of the wastewater cyclone is 27m. According to the calculation, the static pressure generated by this height difference can overcome the sum of the inlet pressure of the wastewater cyclone and the head loss of the pipeline. Therefore, according to the new process arrangement of the present invention, the gypsum slurry cyclone and the wastewater cyclone remain unchanged, that is, the gypsum slurry cyclone is arranged on a high-level floor, the waste water cyclone is arranged on a low-level floor, and the waste water is removed to give Material bin and waste water feed pump. At this time, the elevation of the overflow of the gypsum slurry cyclone is 38.5m, the elevation of the inlet of the waste water cyclone is 11.5m, and the overflow of the gypsum slurry cyclone will flow to the waste water cyclone by itself. Compared with the traditional process, this new layout method can save about 100,000 yuan in investment costs for waste water feed tanks and waste water feed pumps, and save about 5 kw/h of power consumption for waste water feed pumps.
实施例2Example 2
2×300MW烟气脱硫装置，传统的废水旋流分离系统布置是将石膏浆液旋流器布置在高标高楼层，废水给料箱、废水给料泵、废水旋流器布置在同一低标高楼层，石膏浆液旋流器、废水给料箱、废水给料泵、废水旋流器的标高分别为23m、12m、12m、12m。石膏浆液旋流器溢流(标高25m)与废水旋流器入口(标高13m)的标高之差为12m，根据计算可知，该高差产生的静压不能满足废水旋流器入口压力与管道水头损失之和的要求。因此，按照本发明的新工艺布置，将废水给料箱与石膏浆液旋流器布置在同层，废水给料泵和废水旋流器保持不变布置在低标高楼层，这时，石膏浆液旋流器溢流的标高是25m，废水给料箱标高为23m(比传统工艺布置时的标高增加了11m)，而废水给料泵和废水旋流器入口的标高不变，分别为12m、13m。这时，石膏浆液旋流器的溢流自流至废水给料箱，再经布置在低标高楼层的废水给料泵升压后输送至废水旋流器入口。与传统工艺相比，废水给料泵的初投资低于传统布置，废水给料泵扬程由传统工艺布置时的0.27Mpa降低为0.16Mpa，泵轴功率由5.9kw降低为3.5kw，可节约电耗约3kw/h。2×300MW flue gas desulfurization device, the traditional wastewater cyclone separation system layout is to arrange the gypsum slurry cyclone on the high-elevation floor, and the waste water feed tank, waste water feed pump, and waste water cyclone are arranged on the same low-elevation floor. The elevations of gypsum slurry cyclone, waste water feed tank, waste water feed pump and waste water cyclone are 23m, 12m, 12m and 12m respectively. The difference in elevation between the overflow of the gypsum slurry cyclone (elevation 25m) and the inlet of the waste water cyclone (elevation 13m) is 12m. According to the calculation, the static pressure generated by the height difference cannot satisfy the inlet pressure of the waste water cyclone and the water head of the pipeline. Sum of losses required. Therefore, according to the new process arrangement of the present invention, the waste water feed tank and the gypsum slurry cyclone are arranged on the same floor, and the waste water feed pump and the waste water cyclone remain unchanged and are arranged on the low-level floor. At this time, the gypsum slurry cyclone The elevation of the flow device overflow is 25m, the elevation of the wastewater feed tank is 23m (11m higher than the elevation of the traditional process arrangement), and the elevation of the wastewater feed pump and the inlet of the wastewater cyclone remain unchanged, which are 12m and 13m respectively . At this time, the overflow of the gypsum slurry cyclone flows automatically to the waste water feed tank, and then it is boosted by the waste water feed pump arranged on the low-elevation floor and then transported to the inlet of the waste water cyclone. Compared with the traditional process, the initial investment of the wastewater feed pump is lower than the traditional layout, the head of the wastewater feed pump is reduced from 0.27Mpa in the traditional process to 0.16Mpa, and the pump shaft power is reduced from 5.9kw to 3.5kw, which can save electricity Consumption is about 3kw/h.
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| CN102872710A (en) * | 2012-09-26 | 2013-01-16 | 北京国电龙源环保工程有限公司 | Waste water cyclone system for desulfuration device of thermal power station |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102872710A (en) * | 2012-09-26 | 2013-01-16 | 北京国电龙源环保工程有限公司 | Waste water cyclone system for desulfuration device of thermal power station |
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