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Technical introduction of distributed energy resources

 Technical introduction of distributed energy resources


Natural gas distributed energy resources

I. Definition and advantages of distributed energy resources

The distributed energy resources are an important supplement to centralized power generation and the mutual support and complement to the large power grid.

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Definition of natural gas distributed energy resources

Using natural gas as fuel of energy supply, it refers to a modern energy supply mode to realize the cascade utilization of energy by means such as combined cooling, heating, and power supply, etc. and achieve energy supply nearby the load center. The comprehensive energy utilization rate is more than 70%. It is an important way of efficient use of natural gas.

Advantages

Compared with traditional centralized energy supply mode, the natural gas distributed energy resources have the advantages as follows.

High efficiency: ≥70%,ultra supercritical 45%~48%;

Clean and environmental protection: no  SO2, dust, or solid waste emissions, emission of CO2 is only 60% of that of coal power;

Good security: use and produce nearby

Water consumption: only 1/3 of that of coal power

Land occupation: only 30% ~ 40% of that of coal power

Peak load shifting: reduce the peak load shifting pressure by natural gas and electricity

II. Development status of natural gas distributed energy resources

The four Ministries have issued the first national natural gas distributed energy demonstration project (DRC energy [2012] No. 1571)

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III. Natural gas distributed energy system and equipment

Type of natural gas distributed energy resources

1. Gas turbine, waste heat boiler, steam turbine, steam type lithium bromide refrigerator


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Application system: combined cooling, heating and power system with gas turbine and steam turbine combined cycle power generation

Feature: high power generation efficiency and can be used for steam.

Application area: regional area (Industrial Park and business district)

2. Gas turbine and fuel-gas type lithium bromide refrigerator


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Application system: combined cooling , heating and power system with gas turbine as generator unit

Feature: The gas turbine exhaust flue gas will directly drive the operation of fuel gas type lithium bromide refrigerator, which can reduce the equipment configuration, lower down equipment investment costs, and improve the comprehensive utilization rate of the system energy.

Application area: buildings (hotels, hospitals and office buildings)

Main equipments for natural gas distributed energy resources

Prime mover, waste heat boiler, steam turbine, refrigerator, heat exchanger, control system, and energy management system

IV. Typical projects of natural gas distributed energy resources


Changsha Huanghua Airport Project


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Procedures in summer – Changsha Huanghua Airport

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Procedures in winter – Changsha Huanghua Airport

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Beijing Ranqi Building Project

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I. Introduction of PV distributed energy resources

 1. Photovoltaic power generation refers to the power generation mode directly transforming the solar radiation into electric energy by using solar photovoltaic cells. PV power generation is the mainstream in today’s solar power generation. Therefore, the solar power generation that it is generally said now mainly refers to the photovoltaic power generation.

2. Distributed photovoltaic power generation refers to the photovoltaic power generation facilities with features such as the construction and operation modes near the user's location which are mainly generation and use by themselves, the excess power for the power grid, and balanced adjustment in the distribution system.

3. Distributed photovoltaic power generation follows the principle of adjusting according to local conditions, clean and efficient, decentralized distribution, and use nearby, and takes full use of the local solar energy resources to replace and reduce the fossil energy consumption.

II. Design steps of PV power generation system

1. On-the-spot investigation of the project in the early stage and carry out the feasibility study and analysis;

2. Prepare technical solutions, select equipment models (solar module, inverter, support, monitoring device, other equipment) and make engineering drawings;

3. Engineering design: construction combined with construction and installation, system construction, lightning protection and grounding, photovoltaic cable connection, power grid connection to the system, etc.;

4. Running and debugging after synchronization.

III. Composition of power station equipment

 AC power distribution

             AC power distribution


IV. Successful cases

PV power generation project for an enterprise’s roof construction in Wuhan

Currently, it has been successfully connected to the grid and generated power. All are transmitted to the national grid.

The total installed capacity of the power plant is 1 MW, occupying about 10,000 m2 of the plant roof. The solar energy absorbed by photovoltaic panels is converted to direct current first and then converted to alternating current through inverters. It is estimated that the annual average generating capacity will be about 1,120,000 kWh.

Installed capacity: 1MW

Theoretical generating capacity for 25 years: 25,050,000 KWh

Theoretical saved amount of standard coal for 25 years: 10,000 t

Theoretical emission reduction amount of carbon for 25 years: 25,000 t

The total installed capacity of the power plant is 1 MW, with an annual average generating capacity of about 1,120,000 kWh.

PV power generation project for 1.2 MW plant roof in Huizhou

The distributed power generation project is located in Huizhou. The solar resources are rich in this city. It is suitable to construct the solar photovoltaic power station. This project occupies a roof area of about 20,000 m2 with an installed capacity of 1.2 MW. About 4,800 pieces of 250 Wp polysilicon components are installed. The designed service life of this power station is 25 years. The power generation mode is generation and use by users themselves and excess power for internet connecting. The construction of this project has brought good economic benefits and social benefits for the company.

Installed capacity: 1.2 MW

Theoretical generating capacity for 25 years: 26,842,000 KWh

Theoretical saved amount of standard coal for 25 years: 10,700 t

Theoretical emission reduction amount of carbon for 25 years: 26,800 t

PV power generation project for 3.3 MW plant roof in Jiangsu

Jiangsu is an area with rich solar resources. The average duration of sunlight is 4h. The installed capacity of this project is 3.3 MW. About 13,200 pieces of 250 Wp polysilicon components are installed. Solar cell module, junction box, power distribution cabinet, inverter and other photovoltaic power generation equipment and related accessories are all from domestic and international famous brands, which ensure the stability of the project operation.

Installed capacity: 3.3 MW

Theoretical generating capacity for 25 years: 70,724,300 KWh

Theoretical saved amount of standard coal for 25 years: 28,200 t

Theoretical emission reduction amount of carbon for 25 years: 70,500 t