The advent of new technologies to successfully solve the problem of sugar emissions of sugar enterprises compliance

For a long time, due to bagasse boiler "front-end thermal efficiency is low, difficult to deal with the end of the" constraints, in order to ensure that the smoke emissions standards, sugar companies need to pay millions or even tens of millions per year of denitration control costs, and so on Large economic costs really make sugar companies "a headache."

March 20, the reporter learned from the District Environmental Protection Agency, Nanning Sugar took the lead in the implementation of "clean energy-burning boiler tender project," successfully solve the problem of emissions of flue gas standards. According to statistics, after more than three months of trial operation, the project has reduced the total amount of flue gas emissions by about 138 million cubic meters and reduced the emission of nitrogen oxides by about 115.6 tons. The promotion of the project will also be expected to change the status quo of sugar gas flue gas treatment in Guangxi.

Emission reduction effect appears

Boiler to eat "fine grain"

The reason why the traditional sugar industry produces high-polluting emissions is mainly due to the fact that the bagasse residue of the conventional bagasse boilers is indistinguishable and the coarse slag can not be sufficiently burned in the boiler, resulting in the emission of flue gas temperature and in the flue gas Dust concentration is high. Furthermore, since there has been no successful application of the bagasse drying equipment to the sugar industry, the average moisture content of the bagasse is kept high, which leads to lower calorific value of the bagasse and lower thermal efficiency of the boiler, as well as nitrogen oxides emissions from the flue gas Material concentration is too high and other series of questions.

Relevant person in charge of the Department of Environmental Protection introduced the situation, such a boiler to eat "coarse grains" situation so that sugar companies caught in a "dilemma" situation. On the one hand, enterprises need to consume a large amount of energy in order to meet production needs. On the other hand, enterprises must invest more funds to control flue gas due to the large amount of smoke and nitrogen oxides generated, which directly affects the economic benefits of enterprises.

Solve this problem, Nanning Sugar Co., Ltd. and Guangdong Yue Wei Environmental Technology Co., Ltd., launched a "clean energy-burning boiler project." In line with the innovative research and development thinking of "committed to reducing pollutants rather than increasing pollutants", "Bagasse Boiler Drying and Fuel Injection System" has been successfully developed. The boiler is changed from "coarse grain" to "fine grain" : First, through the dryer to reduce the average bagasse into the water by more than 5 percentage points at the same time after screening, the diameter of less than 3 millimeters of slag directly from the hot air feeder into the boiler combustion, and the coarse slag into crusher crushing Into a fine slag, and then into the boiler combustion.

According to reports, the boiler to eat "fine grain", the low moisture content of small bagasse particles in the boiler has been fully burned, a direct solution to the bagasse low calorific value, low burnout rate, low boiler thermal efficiency, and exhaust gas temperature and nitrogen Oxide high concentration of a series of problems.

Enterprises achieve a win-win situation

Recover the investment cost

It is understood that the "clean energy boiler project" a total investment of more than 600 million investment, focusing on Nanning Sugar Sugar Factory No. 2 boiler installed "bagasse boiler drying fuel injection system" and run a crop season .

How about the operation of the new system? The environmental protection department got the result by comparing the two boilers. Compared with boiler No. 1 without this system, boiler No. 2 has the three major advantages of saving fuel, reducing flue gas emissions, and eliminating the need for denitrification. It is estimated that the average boiler bagasse 2 boiler water decreased from about 46% to about 40%, the low heat value of bagasse from 8439 kJ / kg to 9499 kJ / kg, bagasse packing rate increased from 5% to 8.5 % Or more, a crop season can reduce bagasse consumption of 20,000 tons.

In addition, the No. 2 boiler flue gas standard flow rate compliance, outgassing flue gas no longer need to denitrification control, which not only saves a large number of denitrification treatment costs, but also to achieve a total nitrogen oxide emissions and the concentration of the double decline.

According to statistics, the No. 1 boilers season a total reduction of about 138 million cubic meters of flue gas emissions, emission reduction of about 115.6 tons of nitrogen oxides, saving all expenses more than 600 million, to recover all the investment costs, to achieve the environment Protection and economic benefits of a win-win situation.

Create a new pattern

Realize "second pioneering"

Sugar industry is an important industry in many provinces (autonomous regions) in southern China and is more a pillar industry in Guangxi. In 2016, Guangxi has more than 680,000 hectares of sugar cane planted with an annual output of more than 6 million tons of sugar and an output value of more than 40 billion yuan, accounting for more than two thirds of the country's total sugar output, ranking first in the country. At the same time, 50 million tons, after crushing produces about 11 million tons of pulp-containing bagasse.

Today, the successful application of bagasse boiler drying and burning system is even more gratifying. Recently, Guangxi Sugar Association organized a sugar technical seminar in the whole province at Ling Li Sugar Factory, recommended the technology to more than 100 sugar company executives attending the meeting and actively promoted its advanced experiences and practices.

It is reported that, according to the current Guangxi sugar companies in the boiler calculation of about 300 units, the promotion of Nanning Sugar "boiler clean energy project tender" successful experience, Guangxi can save about 36.514 million tons of standard coal per year to reduce emissions of high temperature flue gas About 19.75 billion cubic meters of nitrogen oxides, about 4,937 tons of nitrogen oxides, dust of about 1580 tons, reducing burning of bagasse about 1.5 million tons, reducing the expenditure of more than 10 billion yuan.

Relevant person in charge of Guangxi Environmental Protection Department said that this not only contributes to the environmental protection in Guangxi, but also realizes the objective of "second pioneering" of Guangxi Sugar Industry and lays a solid foundation for opening up a new pattern of development of the sugar industry.

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