Landfill leachate concentrated liquor and lime slurry synergistic semi-dry desulfurization process and system thereof

Abstract

The invention provides a landfill leachate concentrated liquor and lime slurry synergistic semi-dry desulfurization process and a system. The landfill leachate concentrated liquor and lime slurry synergistic semi-dry desulfurization process comprises the following steps: mixing leachate concentrated liquor with calcium hydroxide dry powder to prepare lime slurry; conveying the lime slurry to the top of a desulfurization tower, atomizing the lime slurry into liquid drops, and spraying the liquid drops into the tower in an umbrella shape along the clockwise or anticlockwise direction; flue gas is introduced into the top of a desulfurization tower, the flue gas and liquid-drop-shaped lime slurry enter the tower in the reverse movement direction, the flue gas collides with the liquid-drop-shaped lime slurry, acidic substances in the flue gas react with calcium hydroxide in the lime slurry, the acidic substances in the flue gas are removed; at the same time, the leachate in the lime slurry is completely evaporated into water vapor and solid substances by utilizing the temperature of the flue gas, and the water vapor and the solid substances are discharged out of the desulfurization tower along with the flue gas; and introducing the flue gas discharged from the desulfurization tower into a dust removal device, and collecting solid substances. According to the invention, semi-dry desulfurization is realized, complete evaporation of leachate is realized, zero discharge and maximum reduction of waste liquid are realized, and the operation cost is extremely low.

Description

technical field [0001] 本发明涉及垃圾焚烧工艺领域,具体地,涉及垃圾渗沥液浓液与石灰浆协同半干法脱硫工艺及其系统。 Background technique [0002] 目前,国内的垃圾焚烧厂项目内,都面临垃圾渗沥液难以处理的问题,垃圾渗沥液一般来自于垃圾堆放过程中,由于厌氧发酵、有机物分解、雨水淋洗等原因产生的成分较为复杂的有机废水,同时在垃圾焚烧炉的运行过程中,进料系统中也会因垃圾挤压产生渗沥液。这些渗沥液处理难度较大,有害成分较多。一般焚烧厂内需要难度配备一套渗沥液处理系统,一般包含预处理+厌氧+外置式MBR(硝化 / 反硝化+超滤系统)+NF+RO等系统设备,属于较为成熟的处理工艺,但是依然存在较为明显的缺点,处理工艺设备较多,投资较大,处理成本较高,占垃圾焚烧厂水处理成本的50%左右,同时,依然无法完全的处理渗沥液,通过传统工艺处理的结果依然包含30%左右的浓缩液,这部分浓缩液有害成分极大,无法通过现有技术彻底处理。 Contents of the invention [0003] 针对现有技术中的缺陷,本发明的目的是提供一种垃圾渗沥液浓液与石灰浆协同半干法脱硫工艺及其系统。 [0004] 本发明第一个方面,提供一种垃圾渗沥液浓液与石灰浆协同半干法脱硫工艺,包括: [0005] 将垃圾渗沥液浓液与氢氧化钙干粉混合,配制成石灰浆; [0006] 将得到的石灰浆输送至半干法烟气脱硫塔的顶部,并将所述石灰浆雾化成液滴状,沿顺时针或逆时针方向以伞状形式喷入塔内; [0007] 将烟气通入所述半干法烟气脱硫塔的顶部,并将烟气以与液滴状的石灰浆呈反向运动方向进入塔内,烟气与液滴状的石灰浆发生碰撞,烟气中酸性物质与石灰浆中的氢氧化钙发生反应,脱除烟气中的酸性物质的同时,利用烟气的温度使石灰浆中的渗沥液完全蒸发成水蒸气和固体物质,随烟气排出所述半干法烟气脱硫塔; [0008] 将从所述半干法烟气脱硫塔排出的烟气通入除尘装置中,利用所述除尘装置收集烟气中的固体物质。 [0009] 优选地,所述将垃圾渗沥液浓液与氢氧化钙干粉混合,配制成石灰浆,其中,配制成氢氧化钙浓度为7%-13%的石灰浆,且所述氢氧化钙的浓度根据所述半干法烟气脱硫塔的出口烟气中的酸性物质的含量的浓度调节。 [001...

AI Technical Summary

Problems solved by technology

Generally, it is difficult to equip a leachate treatment system in an incineration plant, which generally includes pretreatment + anaerobic + external MBR (nitrification / denitrification + ultrafiltration system) + NF + RO and other system equipment, which is a relatively mature treatment process. , but there are still obvious shortcomings. There are many treatment process equipment, large investment, and high treatment cost, accounting for about 50% of the water treatment cost of waste incineration plants. At the same time, it is still impossible to completely treat leachate. Through traditional processes The result of the treatment still contains about 30% of the concentrate, which has extremely harmful components and cannot be completely processed by the existing technology

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