Waukesha Waukesha APG1000 oil associated gas, coal bed methane, gas, coke oven exhaust gas turbine 
 Tat Engineering Co., Ltd., Dongguan City, China, the exclusive agent 15,015,239,521 
 As we all know, natural gas is a good time to clean energy, is widely used around the world. Data shows that the current worldwide consumption of natural gas accounts for more than 20% of total energy consumption. 

 As an energy source, natural gas use patterns present mainly in two forms - heat or electricity. However, from the perspective of energy use, natural gas, heating, or whether it is purely for electricity generation are not maximize its effectiveness. - From the heating point of view, by burning natural gas, heating medium (water) for heating, energy efficiency is too low. This is because the combustion of natural gas up to the maximum temperature above 2000 ℃, and the required heating temperature is usually only in the 200 ℃ ~ 300 ℃, and even 50 ~ 70 ℃, the temperature disparity brings a great deal of energy loss; 

 - Such as the use of natural gas, the problem of high cost, the price of natural gas is more expensive, according to an heat value, gas prices are four times more than coal prices, purpose-built natural gas power plants for electricity generation, currently can not be generally accepted by users. 

 Thus, proposed to be involved in this issue: Can the use of natural gas this energy, both heat, and power generation, combined heat and power to achieve it? Practice shows that the use of natural gas combined heat and power to achieve not only in theory and entirely feasible technically, but also improves the efficiency and effectiveness of the use of natural gas, is an excellent way of rational use of natural gas. 

 2 The basic principle of natural gas cogeneration 

 Currently the world's most popular way of natural gas cogeneration technology for gas turbines for waste heat recovery, the generator exhaust pipe from the exhaust gas temperature up to 560 ℃, through the heat recovery devices (gas boiler) to absorb exhaust heat, while the generator exhaust gas temperature control in the 100 ℃ ~ 130 ℃ or so, in the production of heat, but also make the engine more efficient, more economical to run. 

 General thermal power generating units of electricity generated by the fuel consumption of only the total energy of about 1 / 3, and the remaining 2 / 3 of the energy is converted into heat energy, and often is not being used in the case of emissions out. Cogeneration is the production of electricity and thermal power generating units at the same time heat the two products, so that energy efficiency can be increased to roughly 80%. 

 No doubt, in a variety of thermal power equipment in the most suitable gas turbine cogeneration to be used for the following reasons: 

 1) The higher heating value of natural gas, thermal potential; 

 2) natural gas generator sets long life, low maintenance cost, low emissions, clean environment; 

 3) natural gas generator sets one-time investment costs are relatively low; 

 4) implementation of the project as natural gas, city gas pipeline network system, gradually complete shape, the city natural gas power plant of choice for small self-energy, prospects can be developed; 

 5) At present, the low-power (2MW below) gas turbines have a relatively mature technology, to achieve in a small cogeneration system to provide technical support, so users can be in the form of combined heat and power a variety of self- choice; 

 6) industrial policy and environment protection and energy development oriented, as natural gas combined heat and power technology to create a good social atmosphere. 

 3 Combined Heat and Power Applications 

 Shanghai Minhang District Central Hospital (hereinafter referred to hospital) is located in the district seat of government Xinzhuang town, new development in recent years, one of Shanghai. After the expansion of the hospital a total construction area of ??4667m2, with 26 departments, 600 beds in use at the end of 2002, is a local landmark. 

 Electricity load in the hospital, lighting accounts for 23%, 6% lift, refrigeration equipment accounted for 31.3%, 10.5% logistics equipment, medical equipment accounted for 17%, water heaters and other 12% more. By spring and autumn, low load calculation, the morning power load is about 1200kW, the afternoon is about 800kW, at about 200kW. 

 Engineering design for the core of cogeneration is to determine reasonable "thermoelectric than" to be electric heat, and take into account years of operation rate. The rational allocation of system not only determines the reliability of equipment, but also to the payback period and long-term operating costs and other comprehensive benefits issues. To this end, the construction of combined heat and power generator side FG Wilson Inc. (hereinafter referred to as the construction side) based on the actual situation of the hospital's engineering design. 

 Construction program analysis: Spring and autumn are the hospital with a low peak heat, summer is the peak period, peak in winter is hot on a day case, and treatment of hospital the morning peak period, but also with peak power, but not in the peak heat; afternoon, the morning of treatment and treatment rate of about 50% to 60%, electricity consumption decreased, but increased water consumption; night only set up the emergency, but the room lighting and domestic water to the electrical , have reached the peak heat demand. Because the hospital has been equipped with 2 way into the 10kV electricity line and 4t, 2t boilers and other conventional power, geothermal facilities, natural gas, combined heat and power generator equipment should be mainly responsible for peak shaving capabilities. We choose two sets of final construction Weir letter G500 type (2 × 400kW) gas generator spare each other, reached full power (ie power 400kW) conditions, a single set of units produced per hour of hot water and 300kg 5t70 ℃ steam, can regulate the summer, winter and night hospital electricity, hot peak of the equipment needs, and achieve better economic results. Shanghai, natural gas heat value per cubic meter 8400kcal/m3 calculation, Weir letter G500-based power generation gas turbine at full load, the total gas consumption is 125.8m3 / h, including power generation (400kW) up to 35% thermal efficiency, production and living water 5t (from 12 ℃ heated to 70 ℃) thermal efficiency of 27%, steam 300kg (from 12 ℃ heated to above 100 ℃) thermal efficiency of 16%, three combined total thermal efficiency of 76%, significantly saving energy and considerable funds, More importantly, through the reuse of heat generator unit, the pollution emissions bottoming out. 

 Gas turbine cogeneration implementation, to break the traditional management style and power generation, heating, hot water supply, cooling and environmental pollution control and many other work into consideration, with minimal funding, resources and environmental costs, in exchange for the highest investment efficiency, energy efficiency and energy efficiency facilities, can be described as the number of birds with one stone.