The QYD pressurized gas-feed gas desulfurization tower dedicated gas-liquid mass transfer device technology developed by Changchun Dongshi Science and Trade Industry Co., Ltd. has been successfully applied to the conversion gas desulfurization system of Shandong Feida Chemical Technology Co., Ltd. After the equipment was put into operation, at full load, the electricity consumption was 130 kilowatts/hour, which was 190 kilowatts/hour lower than before the transformation, and the annual electricity saving was over 1.5 million kwh; the equipment export hydrogen sulfide was about 10 milligrams per cubic meter. The solution circulation volume is 150 cubic meters/hour, which is more than 50% lower than before the transformation; the gas purification degree is obviously improved; the high-efficiency, environmentally-friendly desulfurization is realized; the investment and operation cost are low, and the plugging problem of the desulfurization tower packing is completely solved; Only one desulfurization pump saves electricity, and the annual direct economic benefit reaches 550,000 yuan.
The purification of gases, especially the removal of sulfides from gases, is the key to ensuring the long-term stable operation of ammonia and urea production plants in coal chemical companies, and is the most important aspect of production process control. Excessive H2S in the gas will cause permanent poisoning of shift catalysts, methanol catalysts, ammonia catalysts, methanation catalysts, and shortened life spans; the carbon dioxide decarbonation system will deposit sulfur scales on the walls of the water cooler and on the fillers, affecting heat transfer and plugging the fillers. The copper washing system will cause the copper solution to absorb hydrogen sulfide to produce copper sulfide deposits, which will increase the copper washing liquid and copper consumption. The urea and ammonium bicarbonate systems will cause equipment corrosion and affect the quality of urea and ammonium bicarbonate products.
According to Gao Zhidou, chief engineer of Changchun Dongshi Company, the compound mass transfer device technology is a new energy-saving and emission-reduction technology newly developed by the company's Gas Purification Design Research Center. Its core product is high-efficiency, energy-saving, environmentally-friendly mass transfer internals. The gas distribution device consists of four parts: a gas distribution device, a bubble re-discharging device, a downcomer, and a liquid holding section formed after assembly. This technology further strengthens the gas-liquid mass transfer process and fully utilizes the desulfurization reaction mechanism—the principle of the instantaneous reaction of hydrogen sulfide and alkaline solution. A large number of small bubbles are formed by the gas distribution device and the air bubble redistribution device, and the air bubbles are in a very short time. Internally, the desulfurization liquid is fully mixed and contacted, and mass transfer is promoted. This greatly increases the gas-liquid contact area and greatly improves the degree of gas purification, thus completely solving the problem of desulfurization tower plugging that has been pending for many years in the desulfurization field of the coal chemical industry.
Shandong Feida Chemical Technology Co., Ltd. is a comprehensive chemical enterprise that integrates chemical fertilizers, chemical raw materials, and rubber and plastics additives. With the increase of output, the device of the original shift gas desulphurization (change-off) position is obviously in an overloaded state. H2S after conversion has exceeded the standard, seriously affecting the normal production of the company. To this end, the company selected QYD-type gas-liquid mass transfer internals technology newly developed by Changchun Dongshi Co., Ltd. through inspection and repeated argumentation. Zhang Datao, general manager of Shandong Feida Chemicals Co., Ltd., told reporters that after the plant is put into operation, the desulfurization efficiency is high, and energy saving and consumption reduction are obvious. When the H2S content is as high as 1.836 g/m3, the H2S content after desorption is reduced from 0.024 g/m3 to 0.0085 g/m3; the system resistance is stabilized at about 0.02 MPa, which is half of the original value; Sulfur rises from 0.8 g/liter to 0.2 g/l. In addition, the technology not only removes H2S better than the original packed tower, but also has greater operating flexibility. When overhauling the regeneration system, it will not affect the process H2S process indicators in a short period of time. Stop the pump within 2 to 3 hours. Export hydrogen sulfide is still within the scope of the index, which is the effect that the packed tower cannot achieve before the renovation.
At present, most desulfurization towers for wet desulfurization in the domestic coal chemical industry basically use packed towers. However, with the continuous expansion of production scale, application of high-sulfur coal, and diversified adjustment of post-process products, companies are increasingly demanding desulfurization. The more stringent, the drawbacks caused by packed desulfurization towers are becoming more and more prominent. Not only is the tower bigger and bigger, the circulation volume is getting higher and higher, and even the degree of purification is increasingly unable to meet production needs, leaving enterprises with headaches. The phenomenon of plug tower plugging towers is getting worse.
The new internal device technology of Changchun Dongshi not only adapts to the transformation of the old desulfurization tower, but also applies to the design and construction of the new tower. The transformation of the old tower can increase the production capacity by more than 10%; it can save 50% of the time for the new tower construction. The cost of the investment, the sulfur absorption capacity of the desulfurization solution can be doubled, and the circulation volume of the solution is reduced by about 50% compared to the packed tower.
It is reported that this technology has already applied for national patents. Since the successful use of Shandong Feida Chemicals Co., Changchun Dongshi has officially promoted this technology to the domestic coal chemical industry at the end of last year, which has aroused a strong response and is favored by chemical companies. It has also been recognized by industry experts in desulfurization. Up to now, dozens of companies such as Shandong Haihua Shengxing, Henan Jinkai, Henan Xinguan, Shandong Bohai, etc. are using this technology, in addition there are many companies such as Henan Yingshang, Anhui Samsung, Hebei Hejian and so on. Under construction.
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