The National Development and Reform Commission recently issued a notice to further improve the environmental protection tariff policies such as denitrification and dust removal from September 25. Industry experts accepted that an interview with the “China Power News†reporter said that the introduction of this series of policies means that in the thermal power on-grid tariffs, the initial formation of a relatively complete environmental protection electricity price system, has a great role in the promotion of PM2.5 around, but some of the thermal power The company stated that in terms of new denitrification electricity prices, high-parameter, large-capacity units can achieve defensive or low-cost denitrification, and denitration of units with 300,000 kilowatts or less is still facing losses; and in terms of dust-removal prices, the current situation is large. Some coal-fired units do not meet the standard for soot emissions, and it is obviously a long way to go to achieve emission standards to obtain electricity price compensation.
High-parameter large capacity unit denitrification or profitable
Up to now, the proportion of desulphurization and denitrification devices that have been put into operation in thermal power installations in China has been respectively 92% and 27%. The operating rate of desulphurization facilities for coal-fired units across the country has increased from less than 60% in 2005 to over 95% currently, with The average denitrification efficiency of coal-fired units exceeds 66%. After the implementation of the desulfurization price policy in 2004, the sulfur dioxide emissions of the power industry have dropped significantly. Since the “Eleventh Five-Year Planâ€, the country’s cumulative decline has exceeded 35%. At the end of 2011, trials of denitrification electricity prices began. In the first half of this year, the nitrogen oxide emissions of the power industry fell drastically for the first time and fell more than 9% year-on-year.
At the end of 2011, China tried a denitrification electricity price policy for coal-fired power plants that installed and normally operated denitrification devices, and increased the price by 0.8 cents per kilowatt-hour to compensate for the increase in denitrification costs. At the beginning of the implementation of denitrification electricity prices, the industry generally stated that the denitrification price only solved the problem of two-thirds of the cost of denitrification, and thermal power companies still had to pay for denitrification themselves. Now, the denitrification price compensation standard has been increased from 0.8 cents per kilowatt-hour to 1 cent. Will this price balance the power plant's cost pressure due to the increased denitrification device? Wang Xiufeng, general manager of Hebei Huadian Shijiazhuang Luhua Thermal Power Co., Ltd., told reporters that the company's first-phase construction of 2×33 million kilowatts of subcritical air-cooled heating units, the project construction and installation of electrostatic precipitator, flue gas desulfurization, flue gas denitrification devices, in Energy saving and environmental protection has a demonstration role. In particular, the flue gas denitrification device is completely designed and constructed in accordance with the latest national standards for environmental protection, energy conservation and emission reduction, and a relatively high-efficiency selective catalytic reduction flue gas denitration system (SCR) denitration method for large flue gas volume of large-scale units is adopted. The total investment of the project is 68 million yuan, accounting for 2.3% of the total investment of the Luhua project. The denitrification units of the two units have now been completed. The actual measured denitrification costs include tax 0.0129 yuan/kWh, and the denitrification price is 0.8 cents/kWh. Raising to 1 cent is still not enough to make up for the cost, but it can relieve business pressure to a certain extent.
Li Gang, General Manager of Pingdingshan Power Generation Branch of China Power Investment Henan Power Co., Ltd., has different opinions: The company owns 2×1 million kilowatts of power generating units. According to the environmental assessment requirements, the power plant design only reserves space for denitrification devices. However, the company takes the initiative to raise standards and “look far aheadâ€. The denitrification site was reserved for the simultaneous construction of denitrification facilities. At the same time, a flue gas desulfurization, denitrification device, circular closed coal yard, and full-film boiler make-up water treatment system were established at the same time. In April 2013, the denitrification electricity price was successfully obtained. The company uses an SCR denitrification process and calculates the annual power generation utilization hours of two units by 5,500 hours. The average denitrification cost is 0.81 points/kWh. According to the previous subsidy of 0.8 kWh, it is difficult to maintain the operating costs of denitrification facilities. Now the country gives a 1/kWh denitrification price subsidy, which brings great help to power generation companies in terms of funds and policies, can compensate for the company's denitrification operating costs, and greatly increases the company's enthusiasm for denitrification.
After interviewing the relevant responsible persons of a number of power generation companies, the reporter came to the following conclusion: The denitrification price of 300,000 kilowatts or less is not enough to balance the cost pressure, and 600,000 kilowatts of units have profitable denitrification losses, millions of kilowatts Unit denitrification is profitable.
Enterprises get a long way to go
Some experts estimate that at least 50% of dust removal equipment on the market needs to be reconstructed to achieve a smoke and dust emission standard of 30 mg/m3.
For the manufacturers of millions of units, this policy is more conducive to the advantages of large units. For example, the dust concentration at the outlet of the two unit chimneys of the Pingdingshan Power Generation Branch of China Dianping Investment Henan Power Co., Ltd. has been maintained at about 30 mg/m3. The company has launched a plan for the optimization of electric dust removal to ensure that the transformation will be much better than the dust-removal tariff subsidy standard. Strive to get the dust removal power price approval.
However, for a unit with a capacity of 300,000 kilowatts or less, there is a bit of "dust". For example, from the current situation in the Hebei region, most coal-fired units have smoke emission concentrations of 40-50 mg/m3, basically failing to meet the electricity price compensation emission standards. It is necessary to further reduce emissions by transforming the electrostatic precipitator, so as to be able to enjoy the policy. In reality, it is difficult for companies to complete the transformation within one year. Therefore, there is a gap in the initial intention of encouraging the introduction of policies. However, Wang Xiufeng, general manager of Huadian Shijiazhuang Luhua Thermal Power Co., Ltd., also welcomed this policy and believed that in the long run, the promulgation of this policy will stimulate the enthusiasm of coal-fired power generation enterprises to accelerate the construction of emission reduction facilities and promote the awareness of enterprises to improve the The establishment of a long-term mechanism for reducing emissions has a positive effect.
One thing is worthy of recognition: the introduction of the environmental protection pricing policy will greatly promote the development of energy-saving and environmental protection industries.
In the future, the cost of various environmental protection units for active duty units will be as high as several hundred billion yuan. This does not include the increased operating costs of environmental protection facilities due to higher standards.
Pressure reducing valves has two types, direct operated type and pilot operated type.
Models DR are pilot operated reducing valves. They reduce pressure in a branch circuit lower than that of the main circuit. The valve design is capable of maintaining a precise pressure setting even at high flow.
Models ZDR are 3-way direct operated pressure reducing-relieving valves. They maintain a [reduced" pressure in a branch circuit and permit [relieving" pressure spike occurrences in the reduced branch circuit. Options for pressure ranges and operator adjustment options are within the scope of the modular Reducing Valve portfolio.
ZDR Features:
l Sizes 6 and 10
l For mounting:
– Size 6: Porting pattern according to ISO 4401-3, NFPA T3.5.1M Ra, and ANSI
B93.7 D 03
– Size 10: Porting pattern according to ISO 4401-05, NFPA T3.5.1M R1, and ANSI
B93.7 D 05
l Pressure reduction in channel A, B or P
l Four pressure ratings:
– 25 bar (360 PSI), 75 bar (1100 PSI), 150 bar (2175 PSI), and 210 bar (3050
PSI)
l Adjustment type:
– Rotary knob
DR Features:
l Size 10, 20
l Nominal pressure 100, 200 Bar
l Mounts on ISO 5781-06, 08, or 10
l 4 adjustment types for pressure adjustment,
optionally:
– Rotary knob
– Hex screw with protective cap
– Lockable rotary knob with scale
– Rotary knob with scale
Pressure Reducing Valves
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