On April 2-4, 'Storage and Energy International Summit and Exhibition 2018 (ESIE 2018)' was held at the Beijing National Convention Center. Zhang Wenliang, Chairman of Beijing Today Energy Technology Development Co., Ltd. gave a speech at the theme forum. The following is the speech content. :
Beijing Today Energy Technology Development Co., Ltd. Chairman Zhang Wenliang:
Dear leaders, Dear friends, Good afternoon, everyone. Today, the topic that I have come here to share with you is on the topic of flexibility in the transformation of thermal power.
First, look at the necessity of thermal power flexibility transformation. By the end of 2015, the installed capacity of hydropower, wind power, and solar power in our country reached 320 million, 130 million, and 4.2 million kilowatts respectively, ranking first in the world, and the total amount of renewable energy power generation. Ranked first in the world. At the same time as the rapid development of renewable energy, some areas in our country have abandoned the wind and the contradiction between light and shade has become more prominent. In particular, the wind in Northern Shaanxi has been particularly severe.
Enhancing the adjustment capability of power plants is a solution to the direct and effective measures for the elimination of wind power and solar energy. Looking at the relevant policies, the National Energy Administration issued a notice on the pilot project for the transformation of thermal power flexibility in 2016, which was stated in the notice. The increase of peak shaving capacity reached 640 million kilowatts.
Below are some country-related policies. In March 2016, April, including September 2017, the National Energy Administration and the National Development and Reform Commission issued separate notices and guidance on improving the flexibility of thermal power generation. In the notice and guidance Several times have proposed the development of some energy storage equipment and energy storage technology to improve the flexibility of thermal power.
At present, in the thermal transformation of thermal power, we must pass two methods. One is the increase of energy storage equipment at the user side of the power grid. The other end improves the adjustment capability of the system at the thermal power side.
Today, we mainly share and discuss with you the issue of how to improve the flexibility of the power generation side. We look at the technical route of the transformation of the thermal system into four technical routes, the first technical route, the way of electric heating and heat storage, and the second The technical route is to increase the electric heat pumping method. The third technical route is the way for the heating unit to add heat. The third section is also mainly shared today. The fourth technical route is to reconstruct the steam system process transformation.
Let's look at the way of electric heating + heat storage, that is, adding electric heating devices in the system to increase the electric load. After converting electricity conformity into heat load, it replaces part of the heat load. This method increases the system's consumption of wind power. The space. Its system has a relatively large installed capacity of wind power, and this relatively large-scale method of wind power is more effective, but this problem increases energy consumption, and the impact of electricity price policy is relatively large.
The second technical route is to increase the electric heat pump. This is similar to the previous electric heating and heat storage. The electric heat pump is added to replace the heat load.
The third technical route is that we add heat storage devices to our heating units. We weaken the heat load relationship between users and break the hot-headed mode to achieve thermal decoupling.
Steam flow reforming, in the turbine, high and medium pressure bypass extraction of auxiliary heating, expansion of the unit ratio of thermal power to adjust the proportion of features is that there is a wind adjustment hot spot pen lifting system wind power consumption. If there is no wind, or in accordance with the hot unit to continue operation.
We mainly share the third technical route, heating unit+heating this way. What is the fundamental meaning of this technical route? We add large-capacity demand devices to the traditional power system production model. The heat demanding device has its certain technical characteristics and advantages. The first technical characteristic is relatively stable in input and output, and it is relatively space-saving. Therefore, in this solution, we add a large-capacity link at the hot spot unit to realize wind power. The ability to absorb, break the heat to set electricity, achieve hot decoupling.
In the heat storage technology mentioned many times in previous years, I briefly introduced that phase change heat storage requires phase change heat storage material. When the physical state of the material changes, it releases or absorbs heat as a physical process. A cycle of heat storage or heat release, which is a phase change heat storage material. The phase change heat storage material is 4-5 times the density of water, what is an advantage? The temperature above us is constant and can provide a stable Heat storage platform.
According to the peaking demand of the power plant, according to this characteristic, a device for phase change heat storage suitable for large-scale deployment is developed. We can see the graph on the left. This is a large-capacity phase change heat storage device developed by our company dedicated to power plants. About 30 cubic meters in volume. If converted to 3 megawatts of electricity, the basic principle is very simple. The figure on the right is an instant noodles. High temperature water is injected into the heat storage device, and the metal heat exchanger is The following heat storage materials are used for heat exchange. The low temperature water is eliminated from the low temperature and the above heat storage material is saturated. When the heat is required, it is driven from the low temperature water-cooled end. This is discharged after the heat exchange. This heat is brought out. Is a basic working principle.
Let's take a look at this photo below. This is a project to undertake national science and technology support. This project added 250 kWh of thermal storage device at Inner Mongolia Huhhot Power Plant, and at the same time increased the peak shaving capacity of nearby wind power plants. Basic operation principle, high power generation load We will increase the amount of extraction steam on the basis of normal heating, increase circulating water, and introduce circulating water into the heat storage end. Our unit can participate in peak shaving. We can supply heat to the end of the heat storage system inside the heat storage system. Hot. Such a working principle.
In simple terms, when I have a high electrical load in the daytime, I store heat, and when the heat load is low, I store heat. At night, the electrical load is high and the heat supply is relatively low. We perform heat release.
Let's take a look at the choice of this material. Through research and calculations, we found that the temperature of the phase change heat storage has a certain influence on the amount of wind power consumption. We found that the temperature of the heat storage device is suitable for between 70-100 degrees, if high At this temperature, our thermal storage device is disadvantageous for this, requiring a lower temperature to release heat. If the belt has a low need for heat storage, we choose a phase change material of 89 degrees. Its storage temperature is 90 degrees and the exothermic temperature is 89. Degree. This material perfectly matches the heat storage requirements.
At the same time, we have tested this material. The following is the test curve. We will not elaborate here. The entire charge-discharge efficiency reaches over 98%. At the same time, we test the reliability and stability of this material, that is, the number of cycles used. The material was tested by a third party. We cycled more than 5,000 times, and the decay rate of the material was within 10%.
We will share a project below. The following project is a project of our company to undertake a national science and technology support program. What is the background of this project? It is the thermal power unit in the power structure of our country's northern Shaanxi region that occupies relatively high wind power. The wind-heat conflict is more serious. Our company has developed a large-capacity heat storage device through long-term public relations, and accompanied the wind power thermal power plant in Hohhot, Inner Mongolia. The main design goal was to break the constraint of heat-setting and improve the absorption of wind power plants. ability.
We can see that the scale of this installation is 20 MWh storage capacity, and its power is also 20 MWh. This can reach an hour charge and discharge, and the system can adjust quickly. This peak is relatively high, and it is equipped with 20 megawatts. Watt hour, it is also 20 megawatts of heat release. Improve energy system flexibility and increase renewable energy absorption capacity. Take a look at the figure below. Extraction steam is injected into the heat storage device. When the heat load at night is relatively high, we use The heat in the phase change heat storage device replaces part of the heat load and can give way to it, so that part of the wind power can be absorbed.
The following are related parameters. As we have already mentioned, we use phase change materials that are multiple composite materials that can support an hour's rapidity. During the operation of this device, we mainly passed a software control system. This set of software The control system to coordinate the wind power, coordinate the power and electric heating coordination system, can well match and coordinate the output of the hot-spot cogeneration units and wind power, and suppress the wind power capacity, thus achieving the wind-heat coordination result.
This is some of the parameters and some of the test curves during the system's test run. What is the effect of the project's operation? What is the effect of our project? In the night, the power plant's output drops, which provides more room for wind power. The heat load can be calculated by The heat storage device provides heat storage during the day when the power plant output goes up.
Through the project test, we changed the rate of wind curtailment from 24% to 19%.
The project summary makes full use of electricity, and the thermal system coordinates the complementary capabilities, improves the flexibility of the power system, and provides some ideas for the consumption of renewable energy. This is a layout plan for on-site installation. We basically have about 30 cubic meters per station, and we have arranged the entire site. 16 units.
Our project has also been assisted by Tsinghua University, China South Design Institute and North United Electric Power in the implementation process. We are grateful for this meeting.
After the introduction of our company, we will not talk about it. Thank you all. I have so much content today. Thank you.