High-temperature water source heat pump technology: energy saving waste heat recovery

With the increasing contradiction between supply and demand of energy, how to use energy efficiently and recover various waste heat to save energy and reduce consumption has become an urgent problem to be solved. High-temperature water source heat pump is the recently developed effective solution to the energy and environmental problems in the petrochemical industry. At present, the technology has been widely used in the petrochemical industry in Europe and the United States.

Heat pumps are energy-utilizing systems that transfer heat from low-temperature objects to high-temperature objects through thermodynamic cycles at the cost of consuming a portion of high-quality energy (mechanical energy, electrical energy, etc.) or high-temperature energy . High temperature water source heat pump is a type of high temperature heat pump, which uses a variety of waste heat in industrial waste water to make 70 ~ 90 ℃ hot water, can be used directly for heating and general industrial heating.

In the petrochemical industry, crude oil gathering and transportation system is the basic production system of oilfield, which consumes more energy. A typical crude oil technology system needs to consume both heat and energy to remove crude oil from formation to production of qualified crude oil. The heat energy mainly comes from the natural gas produced by the oil field. In the past to reduce heat loss and improve the efficiency of the heating furnace has been the main method to save energy consumption in the field, and waste heat recovery technology is a weak link.

At present, many oil fields in our country belong to the middle and late period of exploitation, and the water content in the crude oil is huge. 70% of the water in the production fluid is the same as 30% of the crude oil, and is pressurized by a pump. The heating furnace conveys the oil from the wellhead to the joint station for oil-water separation. The temperature of the separated water is between 40 and 60 ° C. Take Shengli Oilfield as an example, at present, there are 52 oil-producing sewage stations with an effluent discharge of 720,000 cubic meters / day and sewage water temperature of 50-70 ℃. Wherein the water temperature above 60 ℃ water at station 14, the outer displacement of about 260,000 m3 / day, a pen very significant wealth may utilize thermal energy.

If the use of high temperature heat pump extracted from 5 ℃ heat recovery, the recovery of energy is 73000kW. Taking into account the heat output of the heat pump up to about 100,000 kW, which is equivalent to 10t / h crude oil all the calories burned, that is, the annual production capacity of 87,600 tons of crude oil. If the heat pump is used to reduce the temperature of oil-contaminated water by 20 ℃ to 30 ℃, 350,000 tons of crude oil can be saved each year, equivalent to 1% of the crude oil output of Shengli Oilfield. Can be seen that the application of high temperature water source heat pump oil and waste oil industry will maximize the use of waste heat resources to create billions of dollars or even billions of dollars in economic value and create a new way to save energy.

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