On February 10th, at the bidding site for the company's desulfurization gypsum products, four bidding companies filled out their own quotation forms in envelopes and handed them over to the notary public. If the bidding is successful, we will take as many green and environmentally friendly products as we have, "said Ren Ligang, manager of Bohai Cement Co., Ltd. of Liaoning Shanshui Cement Group. The representatives of the other three companies were also anxiously waiting for the bidding results in their seats. In the end, Huludao Qiushan Transportation Service Company won the bid at a high price of 97 yuan per ton. This hot product is actually made by using sulfur dioxide, the exhaust gas generated by the company's thermal power plant boiler, as raw material and applying a series of advanced technologies to turn waste into treasure. What is the secret to turning waste gas into hot selling products through corporatization, achieving both environmental and economic benefits? The reporter followed the director of the dust removal workshop of the thermal power plant, * Jun, to explore the newly built flue gas desulfurization and purification device in this factory. Look! That's the water mist produced by the remaining water vapor after filtering exhaust gases such as sulfur dioxide under high temperature, like a huge humidifier. "* Jun pointed to the white gas constantly emerging from the chimney and said," In the absorption tower, the absorption slurry reacts chemically with sulfur dioxide in the flue gas to produce gypsum. At the same time, most of the other pollutants in the flue gas, such as dust and sulfur trioxide, are also filtered out. "In the centralized control room of this factory's flue gas desulfurization, the desulfurization device is automatically controlled under the monitoring of the operator. The online analyzer at the outlet shows that the desulfurization efficiency indicators of sulfur dioxide, smoke, nitrogen oxides, etc. are all within the specified range, meeting environmental protection requirements. According to the technical personnel, the original dry desulfurization rate was around 50%, but now the limestone gypsum wet desulfurization process has a desulfurization rate of at least 92% or more, and has a great appetite for absorbing sulfur dioxide. Where did the absorbed sulfur dioxide go? In the gypsum dewatering system plant, a vacuum belt conveyor over 10 meters long runs smoothly under the roar of the motor. The gypsum slurry that has absorbed sulfur dioxide is first dehydrated by a hydraulic cyclone and then flows into a vacuum belt dehydrator. Under strong vacuum pumping, it is further dehydrated to form desulfurization gypsum, which is then sent to the finished product area. In the past, the by-product of calcium injection dry desulfurization process in boilers - ash residue, due to its high sulfur content, was only mixed in small amounts as a raw material by surrounding cement plants, and the fate of fly ash became a major problem. To ensure the smooth operation of the production system, the remaining parts can only be disposed of through landfill, resulting in a low level of comprehensive utilization. Nowadays, the application path of fly ash generated by limestone gypsum wet desulfurization process is wide, which can be widely used not only in cement plants, but also in mixing plants, block manufacturing plants, etc. In addition, desulfurization gypsum is widely used as an important retarder in the cement production process. Further processing of desulfurization gypsum can also be used to manufacture building materials such as gypsum blocks, gypsum mortar, gypsum boards, etc., with broad market prospects. In the future, deep processing of desulfurization gypsum will be the direction we strive for, "said Li Long, deputy manager of Bohai Group, which is responsible for the sales of desulfurization gypsum. In recent years, the company has attached great importance to environmental protection work, aiming to achieve clean production and circular economy. In combination with the future development of the enterprise, since 2013, the company has successively built and put into operation multiple environmental protection projects such as heavy flue gas desulfurization, catalytic flue gas desulfurization, and thermal power flue gas treatment upgrade. As an environmental protection project under the Blue Sky Project in Liaoning Province, the Jinxi Petrochemical Thermal Power Boiler Flue Gas Treatment Upgrade Project, which has a total investment of nearly 300 million yuan, passed the feasibility report evaluation in March 2013 and started construction in the same year. The project covers an area of 2000 square meters and includes the construction of 4 desulfurization towers, 1 electrical control building, 1 gypsum wastewater treatment complex building, as well as 1 set of stripping devices and 6 sets of bag filter devices. The limestone gypsum wet desulfurization process used in flue gas desulfurization equipment is currently the most mature and widely used desulfurization technology in the world, especially in the United States, Germany, and Japan, where the capacity of units using this process accounts for about 90% of the total installed capacity of power plant desulfurization. In mid January of this year, the company's thermal power flue gas desulfurization device was completed and successfully put into trial production. As of now, the system is running smoothly and the environmental protection effect is significant. (Reporter Zhou Minghua) Short review: While refining and chemical enterprises produce energy products for society, they also consume energy, generating some wastewater, waste residue, and exhaust gas. There are no useless resources, only unreasonable production processes and outdated technologies. As long as they are utilized reasonably, wastewater, waste residue, and exhaust gas can also become resources and generate economic benefits. As the main force in the development of circular economy, refining enterprises must continuously strive towards the direction of realizing circular economy, enabling efficient recycling of resources. By applying advanced technology and updating outdated equipment, they can organically combine clean production with comprehensive utilization of wastewater and exhaust gas. While achieving low or even zero emissions of pollution, they must follow the effective process of "resources products renewable resources" to comprehensively utilize energy and waste in refining production. Developing a circular economy is a major strategic measure to implement resource strategies, promote sustainable utilization of resources, and ensure national economic security. It is also an important way to prevent and control pollution and protect the environment. Developing a circular economy will undoubtedly become an important source of sustained vitality for enterprises. Thermoelectric flue gas 1.jpg
