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Posted in Antiques on 03/06/2010 05:48 am by admin
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Calcium carbonate industry, three major energy-saving tough fight
Calcium carbonate plastic products, paints, paper products, rubber products, the main powder raw materials, production methods in two ways: through the carbonization and the production of precipitated calcium carbonate obtained from the ore directly to ground calcium carbonate. With the plastics, paint, paper, rubber products, continuously improve the quality requirements, high-quality calcium carbonate consumption is growing. As the domestic consumer market demand, calcium carbonate inorganic salt industry, the industry has become the largest output, the largest branch of industry enterprises. China's current annual production of various types of calcium carbonate products has reached more than 1300 million tons, ranking in the world.
Although the industry has developed rapidly in recent years, calcium carbonate, calcium carbonate production of primary products, but more high energy consumption, pollutant emissions from large features. Domestic enterprises, they use a manual operation, and even practiced on a cottage, high energy consumption, "three wastes" emissions from large, extensive-type production is serious. In the current state vigorously carry out energy-saving emission reduction requirements under the new situation, calcium carbonate, the major companies in the industry officials and industry experts agreed that the calcium carbonate industry will fight the three major energy-saving tough fight.
Energy consumption must be lower than the foreign
China Association of calcium and magnesium inorganic salt will be Executive Vice President and Secretary General Liu wish by calcium carbonate in the domestic industry, fought for 46 years, it feels as a "calcium Gang" Bang Zhu. When talking about energy-saving emission reduction potential of calcium carbonate industry, pointed out that compared with foreign enterprises, it goes without saying, Take the national average and the advanced level of comparison, the current gap between the calcium carbonate industry, energy-saving emission reduction is very substantial. For example, the gap between consumption of up to 21% limestone, kiln drying the gap between the two coal consumption by 27%. If the average level of consumption of limestone reduced by 10%, an annual industry-wide savings of 675 thousand tons of limestone, saving 70,000 tons anthracite, 297,000 tons of carbon dioxide emissions to reduce the slag 378,000 tons; if an average of two coal reduce the level of 10%, industry-wide annual saving of coal 150,000 tons, 300,000 tons of carbon dioxide emissions. The fresh water consumption at home and abroad, the gap is even greater, the domestic advanced level and the national average for the international advanced level, respectively 3.5 and 8 times, if the whole industry to reach the domestic advanced level of water energy, calcium carbonate, each year the industry could be Water-saving 20 million tons.
Of course, the gap between the potential was great. Many domestic enterprises in carrying out energy-saving emission reduction of calcium carbonate to achieve a good efficiency in working out a lot of good experience.
Hebei Taihang Mountains is located in the hinterland of Jingxing, limestone is rich in resources, over the years the county take advantage of this unique advantage of the development of calcium carbonate industry, has become a base of calcium carbonate industry, the existing production enterprises 105, an annual output of up to 150 light calcium carbonate million tons, accounting for the country's total output 1 / 3. The past two years in the energy-saving emission reduction, the calcium carbonate business Jingxing walk in the forefront of the industry. Association Jingxing calcium and magnesium, according to Kang-Yi introduction of calcium carbonate Jingxing companies have fired the kiln transformation, the kiln gas purification, waste heat utilization, waste water recycling, waste comprehensive utilization of five major battles, greatly enhanced the calcium carbonate industry, cutting energy use Pai, cleaner production level.
Kang-Yi said that in the waste water recycling, the Jingxing calcium carbonate industry, according to the nature of the production of various construction section of different wastewater through a technical measures to solve the water back to the negative impact of production processes to realize all the three stocks closed waste water recycling, water consumption per ton of calcium carbonate reduced from 10 tons to 3 tons. At present, this water-saving technology has been in the county of calcium carbonate enterprise promotion, each year 9.5 million tons waste water emissions, reducing emissions of such pollutants as suspended solids 28.5 thousand tons. Jingxing is located in Shijiazhuang drinking water upstream areas, which is to protect drinking water quality downstream residents in Shijiazhuang have played an important role.
Calcined persistent must be scored
Calcium carbonate industry, energy focus is also focused on energy-saving emission reduction calcining process. The current use of mixing-type shaft kiln calcined processes accounted for the vast majority of enterprises, businesses have adopted more advanced high degree of mechanization, structure, a relatively complete steel shaft kiln, but also a small number of enterprises to adopt a more advanced gas-burning kilns, and imported from abroad, single-tube and double pipe and flow regenerative shaft kiln, but a considerable number of enterprises still use the brick-concrete structure of shaft kiln. From the basic situation of the industry point of view, because the furnace structure, degree of perfection is different from the calcination process, the kiln with coal consumption indicators differ greatly.
According to the China Salt Industry Association statistics, for every million tons of production of light calcium carbonate, the kiln with coal consumption costs, the country's 30 key enterprises, the national average level and the country's highest consumption of enterprises, higher than the national advanced level of 623.7 thousand, respectively yuan, 97.7 million and 2.633 million yuan, the number is considerable. To do a good job calcination processes, energy consumption of this article, in addition to encourage qualified enterprises to introduce advanced technology, mechanical shaft kiln, the industry-wide priority, is how to take measures to improve the majority of enterprises mixing kiln process conditions and improve the mixing kiln mechanical structure, the low consumption forward.
Domestic calcium carbonate experts, Tangshan Wang Pa-Chun Rui Qi pointed out that the company's chief engineer, is currently doing a good job calcining section in energy consumption is necessary to grasp the following two points.
First, we must improve the mechanical structure of the furnace to achieve uniform cloth, so that uniform calcination, decomposition completely. Specific measures is the fabric of existing furnace way rotary switch to a good sealing performance multi-point or continuous rotary distributor, the kiln at the end of fabric air discharge using rotating scroll type or a vibration screening type. Kiln brick-concrete structure should first solve the leakage issue of cracking the shell. After perfecting the kiln after the lime-kiln gas concentration of carbon dioxide process indicators to be reduced from 25% -28% to 32% -36% or even higher, so that the process of carbonation carbonation time 1 / 3.
The second is to control the kiln raw ore particle size and uniformity, increasing the unit output of the furnace and reduce energy consumption per unit product. General business process requirements a maximum size of stone blocks 150mm, but most businesses look at the status quo is the chunks of raw ore approach by a simple broken into the kiln manually. This has greatly extended the complete decomposition of limestone in the kiln in the time required, reducing the capacity of lime-kiln units. If the raw ore particle size can be strictly controlled in the 100-150mm range, the unit will be able to make lime-kiln production capacity doubled.
Small cluster state must be changed
At present, light calcium carbonate producers more than 400, the average corporate undercapacity 150,000 tons a year. As production companies and more small-scale production capacity, industry competition, a serious disorder, enterprise efficiency has continued to decline. In recent years, industry average raw material costs by 30% per year rate of increase, while prices are at an annual rate of 10% down. Today, many enterprises have not even survive a problem, why carry out energy-saving emission reduction?
China Inorganic Salt Industry Association, said team leader Professor Hu Qingfu analysis, as far as 119 pairs of calcium carbonate production enterprises statistics show that more than 10 million tons of annual production is only 5 companies, accounting for 4.20%, annual output of 50000 ~ 10 million tonnes of enterprises 16, accounting for 13.45%, annual output of less than 1.5 million tonnes of 67 enterprises, accounting for 56.30%. The number of enterprises are not included in the statistics, industry-wide 1 / 3 of total production accounted for 3 / 5, showing that the productivity of enterprises are not included in the basic statistics for the annual output of less than 1.5 million tons of business. Key equipment for many businesses there is no large-scale. In particular, the size of the centrifuge so far did not change much. Million-ton plant has 3-4 centrifuges, 50000-ton plant has 15 to 20 sets, 10-ton plant has 30-40 units. This small fleet equipment, resources, energy waste and serious pollution, and an urgent need to change. Hu Qingfu suggested that the relevant state departments we need to raise the access threshold, the new calcium carbonate plant a single set of minimum size to produce 50,000 tons is appropriate, according to the status quo of domestic industries, transformation of existing enterprises, the size of a single set of devices in order to produce a single -3 sets of 20000 tons for the transition period, and as soon as possible the transition to single sets 5 million tons of economies of scale. This is the energy industry, the only way to reduce emissions.
China Inorganic Salt Industry Association, president of pottery with calcium and magnesium salt and India pointed out that the industry how to get out of raw materials rising out of the tax cut, the product down the plight of the price? Implementation of the overall control, in-depth to carry out energy-saving emission reduction is the fundamental way out. On the one hand the industry should be vigorously carried out structural adjustment, improve concentration, so that production to achieve economies of scale; to encourage the formation of calcium carbonate concentration of the Group of companies, optimizing the reorganization; support competitive large enterprise mergers and joint, the formation of a number of competitive at home and abroad industry backbone enterprises. On the other hand, we should vigorously develop and promote advanced large-scale equipment, the focus should pay attention to the furnace renovation, changing intermittent operation to run continuously, to change the same process multiple small-scale equipment for a single large-scale equipment, promote the use of a good energy-saving effect, energy-saving equipment to improve the level of industry technology and equipment to energy-saving emission reduction industry, a deeper level.
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