Technology and device of highly corrosive and highly mineralized oilfield producing water direct fired type heat pump

Abstract

The invention relates to a technology and a device of a highly corrosive and highly mineralized oilfield producing water direct fired type heat pump. The technology of the highly corrosive and highly mineralized oilfield produced water direct fired type heat pump is characterized in that oilfield producing water is firstly fed into a tube of a producing water low pressure heat exchange evaporator through a sewage tank, low pressure clear water is contained in a shell of the producing water low pressure heat exchange evaporator, the low pressure clear water enters a lower pressure absorber shell after the low pressure clear water absorbs heat and is vaporized, a concentrated lithium bromide solution turns into a dilute lithium bromide solution after the concentrated lithium bromide solution absorbs the low pressure clear water and heat is sent out, the dilute lithium bromide solution is fed into a direct fired type generator and heated to boiling after pressure of the dilute lithium bromide solution is enabled to rise through an antiseptic water pump, and vaporized normal pressure water steam is fed to an atmospheric condenser shell through a pipeline. According to the technology of the highly corrosive and highly mineralized oilfield produced water direct fired type heat pump, a part of heat energy is extracted from the oilfield producing water, and used in production and life after temperature of the heat energy is driven to rise by the direct fired type heat pump, and not only is the low grade heat energy in the oilfield producing water efficiently used, but also system heat efficiency is about 1.85 and 2.3 times of heat efficiency of a common heating furnace. Compared with the prior art, a heating coefficient is improved thrice, two flow paths and water pumps are omitted, and the problems of corrosion and scale formation of the oilfield produced water are solved.

Description

Technical field [0001] The invention relates to a process and equipment for the utilization of low-grade heat energy, in particular to a process and equipment for a direct-fired heat pump produced from oil fields with strong corrosion and high salinity. Background technique [0002] my country's energy consumption is dominated by coal and oil, and environmental problems have become increasingly prominent, making China the second largest energy consumer in the world. The resulting smoke and sulfur dioxide emissions accounted for 70% and 90% of the country's total emissions, respectively, and the acid rain formed by sulfur dioxide emissions accounted for one third of the country's land area. [0003] The National Development and Reform Commission requires the strengthening of research on energy-saving technology and energy-saving theories and methods in the exploration, development, production, and construction of the onshore oil and gas industry. Reduce energy consumption in th...

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Problems solved by technology

[0006] In the past few years, oilfields such as Shengli and Zhongyuan have carried out tests and applications of oilfield produced water direct-fired heat pump heating or water-containing crude oil dehydration and external heating. The metal is highly corrosive and fouling is serious. Therefore, for the safety of the equipment in the application, a clear water circulation heat exchange system is added in front of the low-pressure evaporator, which also increases the first-level temperature difference and circulation pump work; for the dehydration and heating of water-containing crude oil , also adopts the process of heating clean water with a direct-fired heat pump first, and then heating water-containing crude oil with clean water, so there are the following problems: 1. The produced water heat exchanger is severely corroded and perforated, and then high-strength titanium heat exchange tubes are used, but the cost Too high; 2. The produced water heat exchanger is seriously fouled, and it cannot be used after one to two years; 3. The produced water-clean water heat exchanger makes the temperature of the low-pressure heat exchange evaporator of the produced water entering the direct-fired heat pump oil field only 35 -40°C, which is 8-10°C lower than the temperature of produced water; 4. The produced water-clean water heat exchange process requires long-term operation of the water pump; The high-temperature clean water outlet in the combustion-type heat pump is reduced by 20-80°C, and the entropy increases greatly, which reduces the heating coefficient; 6. The water-containing crude oil-high-temperature clean water heat exchanger process requires long-term operation of the water pump; 7. Low-pressure absorber, atmospheric pressure condensation There is no step utilization of the temperature difference in the device, which increases the entropy of the system

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