EAST Hope Cement Plant uses a 75KW air bearing blower for desulfurization process

1 set of RAETTS air-suspension blower EXPL100-08, motor power 75kw (actual operating power 64.5kw),for replacing the original 1 set of three-lobe Roots blower, motor power 110kw. After the renovation of the blower, the maintenance cost can be saved.The cost for maintenace 1 unit roots blower(lubricating oil, bearing/belt, failure rate 1 time/year) is 10,000RMB/year. After replacement, it can save 277,200 kwh of electricity and maintenance costs of 10,000 rmb/year.The comprehensive annual cost saving theory can reach 150,519.6rmb.

Site situation

East Hope Chongqing Zhengyang New Material Co., Ltd. (abbreviation: East Hope Qianjiang Cement) is a joint-stock enterprise jointly invested by East Hope Group and Chongqing Wujiang Electric Power Co., Ltd. The company is located in Zhengyang Industrial Park, Qianjiang District, Chongqing, and was registered in August,2009. It covers an area of about 1600 mu. The estimated total investment of the project is more than 10 billion RMB. After it is completed and put into production, it can realize an annual sales income of about 10 billion RMB and a profit and tax of 2 billion RMB.

The sub-projects under construction or planned by the company are annual output of 360,000 tons of PVC, 300,000 tons of ionic membrane caustic soda, 600,000 tons of calcium carbide, 300MW thermal power, 1 million tons of cement, 1 million tons of aluminum hydroxide, and supporting limestone mines , coal mines, salt mines, bauxite, and the products of the above projects are produced as raw materials for each other, achieving resource sharing, complementary advantages, energy saving and emission reduction, and turning waste into treasure. It is a recycling industry project with great development potential.

Replacement solutions

In this case, RAETTS air bearing blower is applied in Dongfang Hope Qianjiang Cement’s technical transformation of an external wind coal delivery. Dongfang Hope Qianjiang Cement Co., Ltd. (Zhengyang New Materials) (energy-consuming unit) plans to replace the blower to achieve energy-saving effects. Before the replacement, they used three-lobe Roots blower, and the quantity is 1set.The working status is 1 for use and 0 for standby, 24h/d continuous running; according to the equipment working conditions, RAETTS’s  calculation and selection are shown in the figure below:

It can be seen from the above figure that according to the power consumption calculation table and graph, the actual operating power is 66.3kwh, which can meet the using requirements.

The blower system used in the planned energy-saving transformation: RAETTS air bearing blower EXPL100-08, the quantity is 1set, and the relevant performance parameters are as follows: The following figure shows the comparison of the blowers before and after the technical transformation:

The blower used in this replacement solution: RAETTS air suspension centrifugal blower EXPL100-08, the quantity is 1set, and the relevant performance parameters are as follows: 1set of three-lobe Roots blower is currently in use by the energy-consuming company:

Air volume: 55×1=55m³/min

Pressure: 68.6kpa;

Motor power: 105×1=105kw (actual operating power 105kw)

Power/airflow ratio: 105÷55=1.91kw (m³/min);

According to the actual situation of the energy-consuming company, If using high-speed permanent magnet frequency conversion air suspension bearing blower,the parameters will be:

Air volume: 55m³/min

Pressure: 78.4kpa;

Actual motor power: 66.3×1=66.3kw (actual operating power 64.5kw)

Power/airflow ratio: 66.3÷55=1.21kw (m³/min);

Energy saving effect

Prediction of energy-saving after replacing the air blower:

Power saving per hour: 【1.91kw (m³/min)-1.21kw (m³/min)】×55m³/min=38.5kwh

Annual electricity saving: 38.5kwh×1 unit×24h/d×300=277,200 kwh (calculated based on 300 days of running time per year)

Electricity cost saved every year: 277,200 kwh×0.543 rmb/kwh (comprehensive average electricity price)=150,519.6 rmb

1 set of EXPL100-08, motor power 75kw (actual operating power 64.5kw) air-suspension bearing blower, for replacing the original 1 set of three-lobe Roots blower, motor power 110kw. After replacing the blower, the maintenance cost can be saved. The maintenance cost of one unit (lubricating oil, bearing/belt, failure rate 1 time/year) is 10,000 rmb/year. After replacement, it can save 277,200 kwh of electricity and maintenance costs of 10,000 rmb/year , The comprehensive annual cost saving theory can reach 150,519.6 rmb.