Abstract: The application of high temperature water source heat pump to Dagang Oilfield is analyzed in this paper. It has great advantages over alternatives in many aspects such as economy. Key words: high temperature water source heat pump geothermal heating tailwater energy saving and environmental protection The applied analysis of high temperature heat pump using at DaGang Oil Field Fuchun Meng Jing You (Beijing Qingyuanshiji Scientific & technical Ltd.) Abstract: This essay make a analysis of high temperature heat pump using at DaGang Oil Field, at several respects such as economy, have a huge advantage. temperature heat pump; Geo-heating; Tail water; Energy-saving; Environmental protecting. I. Project Overview The first drilling company of Dagang Oilfield Group Drilling Engineering Company, located in Dagang, Tianjin, has a geothermal well with a water temperature of 55 ℃ and a water volume of 25t / h. During the 2003-2004 heating season, Beijing Qingyuan Century Technology companies producing high-temperature water source heat pump, with a total heating area of ​​8500 ?, of which 5500? For the cottage area, office building area of ​​3000 ?. Before 2003, the use of geothermal water for direct heating, poor heating effect; using high-temperature water source heat pump, after a heating season of the actual operation, the heating effect is good, exceeding the original design requirements. Second, the load calculation After checking the relevant norms, outdoor heating temperature calculation in winter in this region is -9 ℃, indoor calculation temperature is 18 ℃. Load index office building in accordance with 60W /? To calculate; cottage in accordance with 100W /? To calculate. Total heating area of ​​office: F = 3000? Total heat load of office building: Q = q × F = 60 × 3000 = 180kW Bungalow total heating area: F = 5500? Bungalow total heat load: Q = q × F = 100 × 5500 = 550kW Third, the status quo analysis Dagang Oilfield Group Drilling Engineering Company First Drilling Company total heating area of ​​8500? 2003 heating season before the use of geothermal water for direct heating, geothermal water for direct heating geothermal water available temperature drop is limited, According to the experience of geothermal heating in Tianjin, the minimum discharge temperature of geothermal water for the heating system with the radiator at the end should not be lower than 35 ℃. According to this calculation, the heat that can be released when geothermal water is heated is: Q = 25 × (55- 35) × 1.163 = 582kw, which is 20% less than the maximum system thermal load of 730kw. In the actual heating system, the heating users are more dispersed and the main heating and return pipes are used for outdoor overhead laying with greater heat loss. Meanwhile, the system Over the years did not make major changes, there is leakage and more serious scaling phenomenon, the cooling effect is not good, the heating system is not based on this low supply, backwater temperature operating conditions design, radiator cooling area is insufficient, these reasons Resulting in less than 40% of the heating, heating room temperature at more than 12 ℃, seriously affecting the normal work. Fourth, the heating program 55 ℃ geothermal water through the first system of supply to the cottage, as much as possible after the release of heat into the heat pump, the plate heat exchanger and circulating water for heat exchange, complete the heat exchange cycle water into the high temperature water source heat pump unit by the heat After the upgrade, the output of 75 ℃ high temperature hot water supply end of the radiator for the 3000? Office heating. Geothermal water supply bungalow temperature decreases, into the plate before the temperature dropped to less than 36 ℃. A total of 118 rooms in the office building, the majority of the company's workers in the building office, the higher requirements of the environment, most of the bungalow at night were mostly uninhabited and therefore relatively less effect on the heating effect, so the key to this project is : Completely solve the heating problems in office buildings at the same time very good to improve the heating system cottage effect. The implementation of the reform program mainly includes the following: 1. The original heating system is divided into two systems, respectively, for the office building system and cottage heating system, the original cottage heating system follows the same method of direct heating of geothermal water, re-laying for, back to the main pipeline, make Pipe insulation, through the calculation to increase the area of ​​the radiator at the end of the cottage heating system, all the hot water first for the cottage system heating, hot water can exothermic 582kw, consider the network heat loss, basic to meet the 550kw cottage System maximum heat load requirements. 2. In order to prevent the geothermal tail water from damaging the evaporator of the heat pump unit, the office heating system is equipped with a titanium alloy plate heat exchanger, and the geothermal tail water after the heating of the bungalow system enters the plate exchange and circulating water on the heat pump evaporator side Heat exchange, the heat pump compressor work in the condenser heat while outputting 75 ℃ high temperature hot water for the office heating, heat pump evaporator side of the circulating water and office heating system circulating water are used to soften the water, to avoid the heat Water corrosion and heat pump units, system pipe network scaling. 3. In the office heating system to add replenishment pressure system, circulatory system; Electricity of main equipment: QYHP-220H high temperature water source heat pump: 66kW Circulating water pump (one with a prepared): 1.5kW Heat water circulation pump (one with a prepared): 1.5kW Replenishment pump (one with a prepared): 1.1kW Actual conditions checking: 25t / h, 55 ℃ geothermal water through the bungalow, the temperature dropped to 36 ℃, the release of energy: Q = 582kW, consider the network heat loss, the basic can meet the 550kw bungalow system maximum heat load requirements. QYHP-220H high temperature water source heat pump unit in this design conditions, the actual heating capacity of 193kW, fully able to meet the office building in the coldest weather heating needs. Economic Analysis According to a heating season analysis of operating conditions, high-temperature water source heat pump unit works well, because the heat pump itself has a complete automatic control function, operation and management personnel according to the weather, set the heat pump water temperature so that the heat pump Average COP has been greatly improved, for example, the weather is not too cold, the heat pump outlet temperature is set to 55 ℃, then the heat pump COP reached 5 or more, energy saving is very good. In the following calculation, we consider the average COP of the heating season of the heat pump system (considering the power consumption of the water pump); 3.8 Price: The electricity price of the project adopts the large industrial electricity price: 0.45 yuan / kWh; the heating time is 120 days / Average annual heat index: consider the average heat index in accordance with 24 hours of uninterrupted heating of 32w / ?. The annual running cost of the project is (excluding geothermal water fee): 32740 Average per square meter: 10.91 yuan /? If you do not use high-temperature water source heat pump, the region will use oil-fired boiler (90% efficiency), the annual running cost is: 108,336 yuan, equivalent to the unit heating area: 36.11 yuan / ?, Operating costs are heat pump 330% . The following table shows the investment income analysis of high temperature water source heat pump and oil-fired boiler (for 3000?): High temperature water source heat pump system oil boiler system Electric energy can be used + circulating pump power consumption Average daily energy consumption 606kW.h 72kW.h + 256kg oil The average daily operating cost of 273 yuan 903 yuan The entire heating season energy consumption 72720kW.h 8640kW.h + 30720kg oil The entire heating season operating costs 32724 yuan 108336 yuan Running cost per square meter 10.91 yuan /? 36.11 yuan /? The initial investment of 260,000 yuan 100,000 yuan Static investment recovery period of 2.2 years It can be seen from the above table, the use of high-temperature water source heat pump system, has an excellent return on investment advantages. Sixth, the project features 1. Waste Heat Utilization, Economic and Energy Saving This project makes full use of the thermal energy in the geothermal tail water to make one well serve the needs of two wells and not only meets the demand of heating, but also significantly reduces the temperature of tail water of geothermal water, which is beneficial to the oil field Further utilization of these geothermal water. 2.Green environmental protection, significant benefits Geothermal water with high temperature water source heat pump instead of oil-fired boilers can achieve good environmental effects and economic effects, to avoid the oil-fired boiler on the environment pollution. There are no safety issues at the same time. 3. Optimize the system to save pump consumption The original plan is to use direct supply of geothermal water, geothermal water on the system there is a serious corrosion, according to the actual situation in the field, only about two years, all external pipe corrosion . The most important office building system in the heating system is now replaced by a mezzanine, greatly reducing the cost of overhauling the heating system. At the same time, the supply and demand of direct supply will also bring about a great reduction in the power consumption of the pump. The circulating pump power consumption in this project is only 1.5kW. 4. Focus on the outstanding, taking into account the rest of the transformation, not only to achieve the heating needs of the office building, the original part of the cottage as a secondary heating issues have been well resolved, optimizing the working environment, all employees receive the praise . 5. A multi-purpose machine, save money In the project, the use of high-temperature water source heat pump to provide winter heating at the same time, but also to provide summer cooling, there are 100KW of cooling capacity, can be about 1000? Multi-purpose machine, thus avoiding the duplication of central air-conditioning investment and improve the utilization of equipment. 6 stable performance, high degree of self-control High-temperature water source heat pump running a high degree of automation, easy to control, less operating personnel, field personnel reflect, just set the water temperature, heat pump compressor will be automatically based on the backwater temperature to upload and Download, energy saving is very good.