Kaishan to practice the development path of renewable green energy

On July 28, Zhejiang Kaishan Compressor Co., Ltd. announced that Star Peak Geothermal, a subsidiary of the company, had recently signed an agreement with Presco Energy and LLC to acquire $3 million of Presco's assets and to pay an additional commission to Presco for the successful development of geothermal resources.

In recent years, Kaishan has frequently purchased foreign geothermal power plants, and has incorporated Singapore, Hungary and Indonesia into its geothermal power plants. But these are just a preliminary attempt to become a global renewable energy development company. Of course, compared with the power giants at home and abroad, the opening of the mountain is just a rookie in the energy arena. But through its unique energy-saving technology, it has gone out of a different path of green energy.

With the continuous development of society, energy shortage and deteriorating environment are becoming two major problems facing mankind. In the industrial field, a large number of residual heat and pressure resources are directly discharged, which not only causes a waste of energy, but also destroys the environment on which mankind depends. In this context, the mountain-breaking screw expansion power generation technology came into being, providing a complete set of solutions for enterprises to use residual heat and pressure resources.

The Kaishan screw expansion generator set includes a direct expansion generator set utilizing residual pressure and an organic Rankine cycle expansion generator set utilizing residual heat. According to the customer's heat source, Kaishan provides a single or cascade direct expansion generator set, single or cascade ORC expansion generator set and direct expansion and ORC cascade generator set and other patents of high efficiency cycle, the residual heat and pressure energy will be used to the extreme, to provide customers with the greatest benefits.

The high-efficiency screw expansion power generation equipment is based on experienced team, core technology and high-quality manufacturing level. First class core technology and high-end core manufacturing are the main goals of mountain pursuit. By introducing the world's top R&D talents and cooperating with the top universities in China, we have solved the problems of insufficient innovation ability and lack of independent intellectual property rights.

In 2009, the Group set up in Seattle, USA; North America R&D Center, established with Dr. Tang Yan as the core from the application, design, production, installation, operation and project management aspects of the international research and development team experienced. From the initial heat source research to the final customer training, the team based on the company's project process to provide customers with fast and superior performance products; according to the North American R & D model, China has achieved a leap from possessing core technology to possessing first-class core technology, research and development capabilities have reached the international advanced level, to achieve The organic combination of international R & D and Chinese manufacturing. The screw expander, the core equipment, adopts Dr. Tang Yan's new line. Its isentropic efficiency reaches the world's leading level up to 88%.

In addition, Kaishan has a number of patented technologies such as screw refrigerant pump, heat exchanger and system structure, advanced technology enables screw expander power generation system to operate efficiently and steadily; in the manufacturing of expander system, from shell, rotor, heat exchanger to the whole system, Kaishan has three wells, Doushan, Hollow. Ed, Karl Zeiss and other world-class processing equipment and testing equipment, of which Germany's Kappa grinder processing accuracy can reach + 5 micron. The expander main engine test rig and expander system test bench also provide guarantee for the performance of the expander.

The screw expander is a volumetric expansion machine. The commonly referred to as the screw expander refers to the twin-screw expander, the mountain screw expander specially for gas expansion development optimization. It is mainly composed of a pair of intermeshing screw rotors and chassis. The rotor and the rotor, the rotor and the chassis are sealed by clearance to form a working chamber with continuous volume change. Gaseous working medium containing heat enters the working chamber and expands adiabatically, driving the rotor to rotate and do work. While doing the work of expansion, the pressure and temperature of the working medium are reduced, so as to realize the conversion of thermal power. The intake of screw expander can be saturated steam or even liquid vapor; the relative motion between screw can restrict scaling, and the scaling can also reduce the clearance and improve efficiency; the variable operating conditions of screw expander range, even at low loads will still have a high isentropic efficiency.

At present, Kaishan screw expansion generator set has been widely used in iron and steel industry waste heat power generation, industrial residual pressure power generation, geothermal power generation and bioenergy power generation and other fields. By the end of 2015, about more than 70 projects of screw expansion power generation have been completed. The total installed power is about 110MW. The project is mainly distributed in steel, petrochemical, plastic, chemical fiber, geothermal, biomass and other industries, Kaishan high-end screw expansion power generation system is running efficiently and steadily.

Industrial residual pressure power generation

Industrial residual pressure mainly includes high-pressure natural gas and process gas in steel and chemical industries, as well as saturated or superheated steam with pressure. In order to meet the process requirements, these high-pressure gases or steam usually reduce the pressure to the required value through the pressure reducing valve, resulting in a waste of pressure energy. Kaishan Direct Expansion Screw Generator Unit can effectively recover the industrial residual pressure, and convert the generator into electric power, bringing good benefits to customers.

According to the application situation, the screw direct expansion generator used in industrial residual pressure power generation can be divided into back pressure type and condensing type. Generally, asynchronous or synchronous motors are configured as power output units. According to working fluids, it can be divided into steam type and gas type.

The unit is widely used in steel and chemical industry. The application forms include back pressure type, condensing type, single-stage direct expansion unit, multi-stage direct expansion unit and direct expansion + ORC cascade unit.

The following is an example of a direct expansion generator set for a mountain.

Project location: Jiangsu Cheng Xing phosphorus chemical Limited by Share Ltd

Heat source: 30 barA & 50 t / h saturated steam, requiring 20 ~ 25 t / H & 12 barA steam in the process flow to be used for production process and park steam supply.

Project plan: according to the situation of customer residual pressure, the three stage direct expansion power generation scheme is adopted. First, the by-product steam of phosphorus-burning furnace is reduced to 12 barA by two KES900 back-pressure screw expanders, and the outlet steam enters the sub-cylinder. The production process uses the steam and the park supply to take the steam from it, and the surplus steam is supplied to a KES 1400 back pressure screw expander for power generation to reduce the pressure to 3 barA, and then to a KES 2300 condensing screw expander for power generation. The exhausted steam is cooled by the condenser and transported to the desalting water tank through the condensate pump and recycled. When the screw expander is in need of maintenance or emergency shutdown, the steam will be released from the original release pipeline. Total installed machine 5.5MW, total net power 4.4MW.

Industrial low temperature waste heat power generation

Industrial waste heat accounts for 17% - 67% of the total fuel consumption, of which recyclable waste heat resources account for about 60% of the total waste heat resources. Kaishan ORC screw expander unit can directly or indirectly recover heat from hot water, hot oil, atmospheric steam, cylinder liner water and tail gas of industrial low-temperature waste heat and generate electricity. According to the heating mode can be divided into direct use of ORC screw expansion unit and indirect use of ORC screw expansion unit; according to the type of heat source can be divided into hot water ORC, steam ORC and other ORC.

The following is an example of the ORC expansion generator set.

Project location: Sinopec Limited by Share Ltd Beijing Yanshan branch

Heat source: gasoline, temperature 135 C, outlet temperature 70 C, flow 125t/h

Project plan: according to the customer's residual heat situation, adopt single stage ORC expansion power generation plan. The hot oil is directly and sequentially introduced into the evaporator and preheater of the ORC unit, and is exchanged with R245fa on the refrigerant side of the heat exchanger to produce high temperature and high pressure saturated gas into the expander to do work and drive the generator to generate electricity. Expansion generator set and customer's original air-cooled parallel connection, when the expansion unit maintenance or emergency shutdown hot oil switch into the original air-cooled cooling.

The main feature of this project is that the light hot oil directly enters the power station to cool down and generate electricity, instead of using intermediate thermal conductive medium, so it has the highest power generation efficiency. At the same time, the power station is designed according to the reliability and explosion-proof standard of petrochemical industry, which achieves remote control, remote monitoring and unattended. The special screw expansion power station for light hot oil in petrochemical industry of Yanshan Petrochemical S Zorb process is installed at 900kW with explosion-proof grade dIICT4. The power station can achieve an annual net power generation of 4 million 730 thousand kWh, save 1656 tons of standard coal, and achieve a CO2 emission reduction of 3934 tons. After the implementation of the project, the cooling capacity of the original air cooler can be reduced by 604 thousand and 800 kWh per year. This project is also a representative project of Sinopec Refining and Chemical Engineering Co., Ltd. and Sinopec Refining and Chemical Engineering Co., Ltd. after signing the "Energy Conservation Service Cooperation Agreement" in June 2015, both sides use their respective advantages to cooperate and jointly provide customers with low-level energy utilization of the overall solution.

Geothermal power generation

Geothermal energy is a continuous renewable energy. Geothermal power generation is the process of transforming underground heat into mechanical energy, and then mechanical energy into energy. Kaishan first put forward the concept of "one well, one station distributed wellhead power station" and developed a mature application technology. The technology is tailor-made geothermal utilization solutions for a number of wells or close to each other, maximizing the use of heat sources. At the same time, combined with high efficiency cascade power generation technology, the efficiency of power generation can be improved. The characteristics of one well one stop geothermal power station are as follows:

A single well can also generate electricity without any waste well, and the heat source of each well can be utilized.

Well, the wellhead power station first generates electricity and then connects to the grid, so there is almost no energy loss.

The production wells with different energy levels are targeted to improve the utilization efficiency of heat sources.

The geothermal steam and geothermal water have been fully utilized by using the patented cascade technology and mixed cycle technology.

The construction period is short, and the grid connected generation can usually be completed in 6-7 months.

Less investment, and generate electricity by side, side income, side development, and short investment recovery period.

The following is an example of the ORC expansion generator set.

Project location: Chena hot spring Geothermal in Alaska, USA

Heat source: geothermal water temperature is 82 degrees, and the return water temperature is 65 C.

Project plan: according to the geothermal condition, the single stage ORC expansion power generation scheme is adopted. Installed 400kW, net power 312kW. Geothermal water is introduced directly into the evaporator and preheater of ORC unit in turn, and is exchanged with R245fa on the refrigerant side of the heat exchanger to produce high temperature and high pressure saturated gas into the expander to do work and drive the generator to generate electricity. Considering the low temperature of ground air and the availability of river water, the water cooled condenser is used to improve the efficiency of power generation. The design of the unit is compact, the container size is designed and the transportation is convenient.

Biomass power generation

Biomass power generation is a kind of power generation using biomass energy, which includes direct combustion of agricultural and forestry wastes, gasification of agricultural and forestry wastes, garbage incineration power generation, landfill gas power generation and biogas power generation. It can be used to generate electricity by direct expansion generator set, ORC generator set or cascade generator set.

The following is an example of the first phase of a biomass power station in Philippines:

Project location: Philippines Buluan biomass power plant

Heat Source: Heat Source 1) Temperature of burning palm, flow rate of 30 t/h saturated steam; Heat Source 2) 115 C, flow rate of 4.3 t/h saturated steam

Project plan: heat source one adopts three stage direct expansion string ORC screw expansion power generation scheme. Total installed machine 3.11MW, total net power 2.5MW. The heat source two is equipped with a ORC expansion generating set. Installed power 400kW, net power 250kW. The total installed capacity of the above stage 3.51MW is 2.75MW. The two phase residual heat power generation project of the biomass power plant also adopts a series of spiral expansion power stations. The total installed capacity is 4.06MW, and the total net generating capacity is 3.05MW.