An energy-saving water injection pump aimed at high-energy consumption and low efficiency of the traditional water injection pump in the later stages of oilfield exploitation is proposed. The hydraulic pump is used as the main power source to control the movement of the piston through the mechanical reversing valve, thereby driving the plunger to move left and right, supercharging the water in the plunger cylinder. First, the structural parameters of the energy-saving water injection pump were determined. Then, dynamic analysis of the pump parts was carried out. The finite element simulation of the piston cylinder and the plunger cylinder showed that the structural strength meets the requirements. The hydraulic system dynamic simulation showed that the output pressure can reach the predetermined pressure. Finally, a field test was carried out in the Jiangsu Oilfield. The results show that the device can meet the water injection requirements of the oilfield.

PM2.5 refers to fine particles with a diameter of 2.5 µm or less in the air. With PM2.5 continuously impacting people's lives, researchers are starting to pay more attention on the treatment of flue gas emitted from coal-fired boilers. This paper introduces a treatment device for ejected fine flue gas. The device uses ejectors to effectively remove acid substances and large dust particles contained in flue gas, and uses air dynamic ultrasonic atomizer to eliminate micro dust particles effectively. The overall scheme of the flue gas processing device is designed, the principle and simulation results of the main components of the ejector are studied, and the optimal value of the ejector ratio is determined by experiments. Finally, the efficiency of processing dust and sulfur dioxide in the flue gas is tested during experiments on the industrial worksite. For the gas emissions from domestic small- and medium-sized coal-fired boilers, this device is more efficient and costs less energy.