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Reporters traveled to Anhui and Henan provinces and counties with the China Environmental Protection Century Travel Group and visited many coal-fired power plants, knowing the development of energy-saving and emission reduction of these power-consuming households.

Everywhere, he Jiaping, the inspector of the Research Office of the National People's Congress Environmental Resources Commission, will carefully check the real-time emission data and historical data curve, and ask the responsible person concerned: "How much power can be achieved for desulfurization and denitrification?" What is the actual load of the power plant? "How much is the cost of disposing of reclaimed water? What's the price for the power plant? He repeatedly emphasized that "environmental protection should be accounted for economically."

Indeed, through numbers, people can know about the efforts, gains and losses, puzzles and demands of these companies in environmental protection, so as to find the way to a green tomorrow.

How much room is left for emission reduction?

On May 8, the reporter came to Bengbu Power Plant of China, which has 600,000 kilowatt coal-fired generating units with water-using equipment in two chemical industries. According to reports, the annual uniform load of the plant is at the disposal of 70%, the current denitrification power can reach more than 80%, the operation rate of denitrification equipment is more than 97%, the desulfurization power reaches more than 95%, and the annual operation rate of desulfurization equipment reaches 100%.

Wu Hai, deputy director of Bengbu Power Plant, pointed out to our correspondent that, as the technical renovation project of energy saving and emission reduction has been solidified, the path of energy-saving food and water-using equipment is becoming scarce, the potential of energy-saving unit is becoming smaller and smaller, the space for emission reduction is scarce, and the pressure of environmental protection and emission reduction is increasing. "The current environmental protection electricity price is not enough to make up for the company's operating cost of environmental protection equipment, which has brought great pressure to the company's operation."

The environmental protection construction of coal-fired power plants mainly includes desulfurization, denitrification and dust removal. Industry insiders say that in these three areas, the emission reduction power of large thermal power plants is near the peak.

At the same time, the "Air Pollutant Emission Code for Thermal Power Plants" which is known as the most stringent thermal power emission code in history will meet the final implementation deadline on July 1 this year. According to demand, the emission standards of soot, sulphur dioxide and nitrogen oxides in key control areas in China are less than 20 mg, 50 mg and 100 mg per cubic meter, respectively. In the United States, the figure is less than 20 mg, 184 mg and 135 mg per cubic metre, while in the European Union, it is less than 30 mg, 200 mg and 200 mg per cubic metre.

"China's emissions demand is more stringent than that of the European Union. Our thermal power companies have reached the limit of tapping the potential of existing equipment. If we want to end the"ultra-clean emissions"in the future, our technical equipment will have to be continuously upgraded and upgraded. It is likely that the technical principles of emission reduction will undergo fundamental changes." Wu Hai said.

As far as the whole occupation is concerned, there is still a lot of room for emission reduction in thermal power plants. Under the situation that the desulfurization transformation of coal-fired power plants in China is close to the "end", denitrification transformation has become the main point. At the end of 2013, the installed capacity of newly built and refitted thermal power plants has risen to 37%, and more than 60% of thermal power units in China are still facing the challenge of renovation.

Reporters know that in 2013, 23 new denitrification equipment for thermal power units were built in Anhui Province, adding 10.755 million kilowatts of denitrification capacity, and the installed capacity share of denitrification units in Anhui Province increased from 42% in 2012 to 70.5%.

"This year, the whole province plans to complete the construction of denitrification equipment for coal-fired units above 300,000 kilowatts, which is under great pressure." Anhui Provincial Environmental Protection Department said.

Can environmentally friendly companies generate more electricity?

On May 12, Qi Yongsheng, deputy general manager of Xingyang Coal and Electricity Integration Co., Ltd., which is only tens of kilometers apart from Zhengzhou, the provincial capital, introduced to reporters that since the 12th Five-Year Plan, the environmental protection policy has become stringent. Since its commissioning in 2010, the company has invested 338 million yuan in upgrading environmental protection and energy-saving equipment.

It is reported that they have invested 170 million yuan to renovate the denitrification equipment of two units separately, which can reduce nitrogen oxides by 18,000 tons annually; 86 million yuan to renovate the boiler by plasma incineration, to end oil-free incineration, and to eliminate the black smoke appearance when the unit starts; 36 million yuan to renovate the capacity of the desulfurization system and cancel it. Two sets of desulfurization flue bypass can reduce sulfur dioxide by nearly 30,000 tons annually, and 92 million yuan is invested to add a first-level flue gas deep purification equipment for two sets, which can further reduce the annual emission of 300 tons of smoke and dust.

The company spends a lot of money on building environmental protection equipment, but the annual average power load is only more than 50%. "Can we introduce some guidelines at the national level to allow companies with leading environmental protection equipment to generate more electricity? It also enables environmental protection equipment to develop its efficiency very well. Qi Yongsheng said.

It is known that due to the high demand of denitrification equipment for boiler temperature, when the temperature is below 300 degrees Celsius, the unit load is less than 50%, and the denitrification equipment will stop running.

A material supplied by the Anhui Provincial Government indicates that the province fully implements the denitrification tariff, adheres to the "green dispatch", and skews to the denitrification units in the distribution of power generation plans. In 2013, almost all of the new generation is given priority to the denitrification units.

Material from Guangxi also shows that in the past year, the local companies that organized denitrification equipment generated 11.7 billion kilowatt-hours more electricity than the previous year, and the thermal power units that did not have denitrification equipment reduced their power generation by 2.6 billion kilowatt-hours compared with the previous year.

In this regard, Ma Xinchun, deputy director of Henan Environmental Protection Department, pointed out that, on the whole, companies with good environmental protection equipment will make it generate more electricity, but the distribution of power generation needs to consider a variety of factors.

Why not make more use of reclaimed water?

On May 10, the head of Yulong Power Generation Company, located in Xuchang, Henan Province, said that the company's supplementary water originated from Baisha Reservoir and Yuzhou City Reclaimed Water, with an average daily intake of 36.9 million tons, during which 10,000 tons of urban reclaimed water were at the mercy of urban reclaimed water, accounting for about 27.1% of the total intake.

China is a country lacking water resources. Water shortage is widespread from Henan to the north. It is a luxury that drinking water is used for industry. However, the occupational water consumption of thermal power generation is endless, and the use of reclaimed water as circulating cooling water has become a trend. Why not use less expensive and environmentally friendly reclaimed water in power plants?

The data supplied by Yulong Power Generation Company may answer the above questions: the water price of Baisha Reservoir is 0.85 yuan per ton, and that of urban reclaimed water is 0.7 yuan per ton. The company indicated that the hardness of urban reclaimed water was high, which did not conform to the hardness standard of "Water Quality of Industrial Water for Urban Sewage Recycling and Utilization", and limited the amount of reclaimed water used.

In short, compared with the water quality and water price of reclaimed water and reservoir water, reclaimed water is not "cheap and good", and power plants are naturally reluctant to use more.

Reporters know that the water quality of circulating cooling water in thermal power plants needs to be stable and reliable. The quality of water affects the safety of thermal equipment in power plants. Water rich in impurities that do not meet the specifications can never enter the cooling cycle system. If the water quality of reclaimed water does not conform to the industrial water quality standard, the power plant should be reprocessed before operation, which will undoubtedly further add environmental protection costs. In fact, this is the crux of reclaimed water reuse, which has always been "thunderous and raindrops small".

According to a survey in Luoyang City, the reclaimed water load rate of Shouyangshan Power Plant accounted for only 37.1% of the planning in 2013, while that of Shenhua Huamengjin Power Plant accounted for only 38.86% of the planning, and that of Datang Thermal Power Plant was 12%.

"It's too cheap for companies to use fresh water!" Ma Xinchun, deputy director of the office, confessed to our reporter that single power plant did not use reclaimed water adequately in accordance with the approval of the relevant parts, possibly because the quality of reclaimed water is not good, but the more crucial question is that the current use of reclaimed water does not have much cost advantage. "The use of reclaimed water in power plants is an environmental and economic question. Who will lay the pipeline? How to ensure qualified water quality? What if they are not qualified? We all need detailed contracts between companies to be clear.

Relevant experts suggest that the government should introduce mandatory guidelines and regulations to save water as soon as possible, and legalize the reuse of reclaimed water. On this basis, we should start from the right to the left and use economic leverage to promote the company's use of reclaimed water. On the one hand, we should improve the collection standard of water resources fees, on the other hand, we should encourage reclaimed water reuse by drawing up reward policy, tax reduction and exemption, supply financing and subsidies. In addition, the relevant parts should strengthen the monitoring of water quality to ensure that its quality is qualified, safe and available.

Author: Hangzhou Water Shield Technology Co., Ltd.

Website: http://www.zjhzsd.com/

Key words: pharmaceutical pure water equipment, chemical industry water equipment, food water equipment