According to China Drying News, a large amount of exhaust gas (carbon black exhaust gas) produced in the production process of carbon black contains harmful gases, explosive gases, carbon black dust, and hydrogen and carbon monoxide. If direct emissions will seriously pollute the atmosphere, if it is equipped with exhaust gas for power generation In the case of cogeneration of heat and power, or setting up an exhaust gas boiler to directly sell steam to a required company, it can make full use of tail gas and waste heat to achieve energy conservation and emission reduction. For such a good thing, the country has also issued relevant policies. However, due to the uneven implementation of local policies, carbon black companies have encountered various problems in the use of exhaust gas and waste heat. Cross-industry transmission of electricity across the industry has various difficulties and severely hindered them. The enthusiasm of comprehensive utilization of carbon black enterprise resources and energy conservation and emission reduction.

It is understood that the total energy contained in the carbon black exhaust gas accounts for 50%-60% of the total energy production of carbon black, and the production of 1 ton of carbon black produces approximately 8000-11,000 standard cubic meters of tail gas, which can produce 7 tons of steam, and the amount of power generated is 1120. Kilowatt hours. Power generation from carbon black tail gas can save energy, reduce CO emissions and carbon black dust pollution, and protect the environment. At present, there are three main uses of carbon black tail gas: First, with tail gas power generation for cogeneration; Second, set up exhaust gas boilers, sell steam to the required companies; Third, the direct sale of carbon black tail gas, supply of city gas and other gas points.

According to Ding Liping, Secretary General of the China Black Rubber Branch of the China Rubber Industry Association, cogeneration using carbon black tail gas is suitable for most of the carbon black plant's exhaust gas utilization methods. At present, major companies in the carbon black industry have adopted tail gas power generation, exhaust gas boilers and exhaust gas. For gas supply and other utilization methods, the exhaust gas treatment capacity of factories already equipped with tail gas power generation, tail gas boilers, air delivery, and other uses accounted for about 70% of the total tail gas emissions, of which the total number of companies using tail gas power generation accounted for about 80%, in addition to meeting The use of electricity and the use of steam outside, but also external supply to the enterprise to create a new growth point of benefit. According to the above incomplete statistics, the annual energy savings exceed 1.4 million tons of standard coal.

During the “Eleventh Five-Year Plan” period, according to the national environmental protection policy and the requirements for the construction of clean factories, the carbon black industry invested about 2 billion yuan to carry out technological transformation, and the proportion of investment in carbon black dust collection and waste gas treatment accounted for 50 percent of the carbon black plant construction. %-60%, energy-saving emission reduction technologies such as carbon black tail gas power generation, wet granulation, and high-efficiency bag filters have reached the international advanced level. According to the statistics of the China Black Rubber Branch of the China Rubber Industry Association, in 2010, China's carbon black industry has formed a power generation capacity of 358,000 kilowatts of exhaust gas and an exhaust gas boiler of 362 tons/hour. In 2010, the industry produced 3.37 million tons of carbon black. The estimated annual power generation for tail gas was 3.77 billion kwh, and the total amount of CO2 emission reduction was 3.77 million tons. Besides generating electricity, the power generation could be used to transmit electricity by 2.5 billion kwh. The effect is very obvious. In 2011, China's newly added carbon black production capacity was fully equipped with a comprehensive utilization device for carbon black exhaust gas, forming an exhaust gas power generation capacity of 431,000 kilowatts.

Ding Liping said that the average fuel consumption per unit of carbon black industry in 2010 was 5% lower than in 2005, direct CO2 emissions were reduced by 12%, and indirect emissions were also reduced accordingly. In the measures to reduce indirect CO2 emissions, tail gas power generation is the main measure. Because of the significant energy-saving and carbon emission reduction effects of carbon black tail gas, in 2003 the National Development and Reform Commission included the “power and heat of carbon black tail gas production” in the “Catalogue of Comprehensive Utilization of Resources” and enjoy preferential policies such as taxation and grid-connection of comprehensive utilization of resources; The Ministry and the National Development and Reform Commission also implemented energy-saving technological transformation and energy-saving service industry incentive policies. However, in the implementation of the national policy, cross-industry power transmission to the grid is difficult, and it is difficult to implement tax reduction and exemption for energy and heat products produced by the comprehensive utilization of exhaust gas and energy-saving subsidies.

Ding Liping explained that the current problem with the use of carbon black exhaust gas is that due to the different policies in different regions, the benefits of exhaust gas utilization and waste heat utilization of carbon black enterprises are also very different. Companies that have a smooth connection to the grid and can obtain reasonable prices for electricity sales have profits. Enterprises that have the conditions to sell steam can also obtain better returns and become a new growth point for corporate economic benefits. However, there are still many places where there is difficulty in grid-connected generation of carbon black tail gas. In some places, there are even phenomena that the company's tail gas is not connected to the grid after it is connected to the grid. This not only makes carbon black companies unable to obtain reasonable benefits through comprehensive utilization of resources, but also There is a loss. In addition, the state's preferential taxation policies have encountered various problems when the companies go to the local areas to fight for them. These have greatly hampered the enthusiasm of comprehensive utilization of carbon resources and energy conservation and emission reduction.

It is understood that the carbon black tail gas power generation and professional coal-fired power generation, its common scale is about 1/60, unit production capacity investment is about 20% higher, assets depreciation accounted for more than 60% of production costs, its advantage lies in the production of carbon black exhaust As a fuel for power generation, it has the dual effects of environmental protection and energy saving, and it has achieved harmony and win-win between the company and society. However, the carbon black tail gas power generation project belongs to the small unit power generation, large investment, and is affected by the reasons such as power grid sales and tax incentives and the implementation of tax incentives, and the cost of power generation is high and the efficiency is poor.

Ding Liping believes that during the "12th Five-Year Plan" period, with the development of the automotive and rubber industries, the carbon black industry will grow at an average annual rate of 13.5%, and by 2015 carbon black production capacity will reach 7.15 million tons. According to the available sensible heat of flue gas and chemical heat measurement of tail gas, it can generate 1 million kilowatts of power, transmit 670,000 kilowatts of power, save 3.2 million tons of standard coal annually (equal value), and reduce CO2 emission by 8 million tons. It is necessary to add 440,000 kilowatts of tail gas power generation equipment, which will require 2.4 billion yuan of construction funds. However, these environmental protection projects have low enthusiasm because of large investment and low returns. If the investment needed for the project cannot be implemented, there will be 39.3 billion cubic meters of carbon black tail gas that cannot be used rationally each year, resulting in waste of resources and environmental pollution. She believes that the state should support the investment in energy-saving projects such as carbon black tail gas power generation, and coordinate the relevant departments to implement the comprehensive utilization of resources policy, so that the carbon black exhaust gas power generation at full power sale, eliminate the loss of tail gas power generation of carbon black enterprises, increase business efficiency, and further Improve the enthusiasm of enterprises to thoroughly develop exhaust gas comprehensive utilization.

For this reason, companies in the carbon black industry have called for the following: First, the taxation department should provide guidance and implementation of preferential tax reduction policies for exhaust gas and waste heat utilization products (electricity and steam) of carbon black factories, so as to increase comprehensive utilization of corporate resources and environmental protection and energy conservation. Second, relevant departments should coordinate the national grid, and provide preferential tariffs for grid-connected carbon black power generation and smooth grid-connected policies to eliminate losses incurred by enterprises for grid-connected and online sales; third, the state should establish energy-saving and environmental protection projects. The project's special funds, for the carbon black industry, are both conducive to the completion of national energy-saving emission reduction targets, but also added to the lack of national electricity and heating.

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