The world's first negative emission power plant wa

2022-08-20
  • Detail

The world's first "negative emission" power plant was born

greenhouse gas emission is an urgent problem to be solved by many thermal power plants through the use of new energy vehicles, recyclable materials and other measures. According to foreign media reports, now the Swiss climeworks company has jointly built the world's first "negative emission" power plant with a geothermal power plant in Ireland

as the name suggests, this power plant not only does not emit greenhouse gases (zero emissions), but also magically turns carbon dioxide into "stone". How did they do it

it is reported that the project is called CarbFix. Scientists dissolve the carbon dioxide produced by the power plant into water, and then pump it to 700 meters underground. When the carbon dioxide water contacts the basalt underground, it can quickly form carbonate minerals

usually, this mineralization process took hundreds of thousands of years ago, but the CarbFix team shortened it to 2 years. Dr. Juerg matter, chief author of the CarbFix project, said that 95% to 98% of carbon dioxide was mineralized in less than two years through this method

Christoph geblad, CEO of climeworks, said that the technology has a broad prospect. There are similar rock formations in many places. If the technology is mature, the carbon dioxide emitted by many factories in the future can be turned into solid and stored underground in this way, greatly reducing global greenhouse gas emissions

thermal power plant, abbreviated as thermal power plant, is a plant that uses combustibles (such as coal) as fuel to produce electric energy. Its basic production process is: when the fuel is burned, it heats water to generate steam, converts the chemical energy of the fuel into heat energy, the steam pressure drives the turbine to rotate, and the heat energy is converted into mechanical energy. However, the resolution of deformation measurement of the experimental machine refers to the minimum measurable accuracy of the data measured by the photoelectric encoder of the experimental machine, and then the turbine drives the generator to rotate, transforming the mechanical energy into electrical energy

the prime mover is usually a steam engine or gas turbine. In some smaller power stations, internal combustion engines may also be used. They all generate electricity by using the pressure drop in the process of changing high-temperature, high-pressure steam or gas into low-pressure air or condensate through the turbine

the basic principle is also very simple

steam water system

the steam water system of thermal power plant is composed of boiler, steam turbine, condenser, high and low pressure heater, condensate pump and feed pump, which includes steam water circulation, chemical water treatment and cooling system. Water is heated into steam in the boiler, and then becomes superheated steam after further heating by the heater, and then enters the turbine through the main steam pipe. Due to the continuous expansion of steam, the high-speed steam drives the blades of the turbine to rotate, thereby driving the generator. In order to further improve its thermal efficiency, some steam that has done work is usually extracted from some intermediate stages of the turbine to heat the feedwater. This feedwater regenerative cycle is used in modern large steam turbine units

in addition, reheat cycle is also adopted in the ultra-high pressure unit, that is, the steam that has done some work is extracted from the outlet of the high-pressure cylinder of the steam turbine, and then sent to the reheated steam of the boiler for heating, and then introduced into the intermediate pressure cylinder of the steam turbine to continue to expand and work, and the steam sent from the intermediate pressure cylinder is sent to the low-pressure cylinder to continue to work. In the process of continuous work of steam, the pressure and temperature of steam are continuously reduced, and finally discharged into the condenser at the same time, cooled by cooling water and condensed into water. The condensed water is concentrated in the lower part of the condenser, pumped by the condensate pump to the low-pressure heater for heating, and then deaerated by the deaerator. The feed pump sends the pre heated deaerated water to the high-pressure heater. The heated hot water is added to the boiler, heated to superheated steam in the superheater, and sent to the steam turbine for work. In this way, we continue to do work over and over again. The steam and condensate in the steam and water system will inevitably run, emit, drip, leak and other phenomena due to many dredged pipelines and many valve equipment, which will more or less cause water loss. Therefore, we must constantly supplement the system with chemically treated demineralized water, which is generally supplemented into the deaerator

combustion system

combustion system is composed of coal handling, coal grinding, coarse and fine separation, powder discharge, powder feeding, boiler, dust removal, desulfurization, etc. It is sent by belt conveyor from the coal yard to the coal hopper in the coal bunker room through electromagnet and coal crusher, and then enters the coal mill through the coal feeder for pulverization. The pulverized coal is preheated by air. In addition, foreign countries have also studied the hot air from the micro experimental machine, beating the pulverized coal to the coarse and fine separator. The coarse and fine separator will send the qualified pulverized coal (unqualified pulverized coal back to the pulverizer) to the pulverized coal bunker through the pulverized coal exhauster, The pulverized coal feeder drives the pulverized coal into the burner and sends it to the boiler for combustion. The flue gas will be sent to the desulfurization device after the dust is removed by electrostatic precipitator, and the sulfur removed gas will be sent to the chimney through the suction fan and discharged into the sky

power generation system

power generation system is composed of auxiliary exciter, excitation disk, main exciter (standby exciter), generator, transformer, high-voltage circuit breaker, booster station, power distribution device, etc. Power generation refers to the high-frequency current generated by the auxiliary exciter (permanent magnet machine). The current generated by the auxiliary exciter is rectified by the excitation disk and then sent to the main exciter. After the main exciter generates power, it is sent to the generator rotor through the voltage regulator and the deexcitation switch through the carbon brush. The generator rotor induces current by rotating its stator coil. The strong current is divided into two circuits through the generator outgoing line, one is sent to the auxiliary power transformer, the other is sent to the SF6 high voltage circuit breaker, and the SF6 high voltage circuit breaker sends power

Copyright © 2011 JIN SHI