KR20200005826A - System of distributed energy production plant using cal - Google Patents

Abstract

The present invention relates to a stand-alone energy production plant system using coal resources. In the stand-alone energy production plant system using coal resources for the gasification using coal and the production of electricity using the same, the stand-alone energy production plant system comprises a solar light utilization mode and a solar light non-utilization mode.

Description

System of distributed energy production plant using cal}

The present invention relates to a stand-alone energy production plant system using coal resources, including a mode using sunlight and a mode not utilizing sunlight. More specifically, the present invention generates electricity using solar light, and uses the electricity thus obtained to electrolyze water to obtain and utilize oxygen necessary for coal gasification, and also at night or in other environments where it is impossible to generate electricity using sunlight. The present invention relates to a standalone energy production plant using coal resources, which makes it possible to use general air to improve the utilization and power generation efficiency of coal resources.

Securing stable energy sources is emerging as the most important task for the future of humankind, and developing and using renewable energy is most important for sustainable development, but considering the current technology level, a considerable amount of energy is still It is inevitable to rely on fossil fuels.

Coal, which is present in the most abundant amount of these fossil fuels, exists in a solid state and is difficult to handle, and is limited in its use range because it is more difficult to control combustion and causes environmental pollution than oil or gas.

However, coal is an important fuel accounting for 28% of Korea's total energy consumption. It is used as an essential fuel and raw material in power generation and steelmaking, and it is used in many fields and still shows its value. There must be a plan that can be used cleanly and efficiently as a source.

The idea of using coal as power is to improve the environmental measures and thermal efficiency. It has already been demonstrated that large power plants are environmentally friendly and efficient at 300 MWe. In addition, energy demand in developing countries such as Indonesia is increasing rapidly, and the primary source of energy for this is coal.

The method of applying coal to power generation includes a method of producing steam by directly burning heat and a coal gasification method of generating synthesis gas from coal and generating power from the produced synthesis gas. The coal gasification is not only power generation, but also coal chemistry using coal conversion technology to produce a synthesis gas containing CO and H ₂ as the main components by reacting with oxygen and water at high temperature and pressurization conditions using less oxygen than that required for complete combustion. It is a very important technology in the industry.

In particular, coal gasification cogeneration generates electricity by converting coal into a gas under high temperature conditions and then burning the gas in an internal combustion engine, a gas turbine, a fuel cell, and the like. In addition, a technique of obtaining gasoline or diesel through a Fischer-Tropsch (hereinafter referred to as FT) conversion technology process by using the synthesized gas to gasify using coal resources and using the obtained synthesis gas is already commercialized.

However, high-grade coal resources are gradually being depleted, and the unused coal is low at about 50% of the total reserves. Therefore, the development of technology capable of generating electricity by utilizing such low-grade coal resources has emerged as a very important task.

In addition, in the existing technology, the coal gasifier is operated by receiving oxygen from an oxygen supply system, which requires an additional power for a process for separating oxygen from air. In this regard, the present applicant has applied a method using solar light as a system for supplying oxygen, and has developed a system for obtaining power generation and gasoline or diesel for 24 hours by reflecting environmental factors not applicable to solar light. Was completed.

Korea Patent Publication 10-2006-0033303

Therefore, the present invention is to solve the above-mentioned problems by using the sunlight to obtain oxygen by electrolyzing water to obtain oxygen by easily supplying high-purity oxygen into the gasifier to obtain a synthesis gas can be generated by using it In addition, coal can be used to maximize the utilization of coal resources, power generation efficiency, and the productivity of producing gasoline or diesel by establishing a system that can generate syngas using air and generate power even in an atmosphere where sunlight cannot be utilized. The purpose is to provide a standalone energy production plant system using resources.

In order to achieve the above object, the present invention is a stand-alone energy production plant system using coal resources to produce gas using coal, using the gas, the stand-alone energy production plant system is a solar light utilization mode and photovoltaic Including a non-utilization mode, the solar light utilization mode comprises: a coal feed pretreatment process for producing a coal slurry; An electrolysis process of producing electricity through photovoltaic power and electrolyzing water with the produced electricity to obtain oxygen and hydrogen; A coal gasification step of supplying oxygen obtained in the electrolysis step and coal slurry obtained in the coal feed pretreatment step with a gasifier to oxidize and gasify the coal slurry in a gasifier; A gas purification step of purifying the syngas generated in the gasifier; A FT synthesis step of supplying gasoline and diesel by supplying syngas purified in the gas purification step and hydrogen obtained in the electrolysis step to an FT reactor; And an all-fired engine power generation process for generating electricity by supplying the off-gas of the FT reactor to the spark-ignitioned all-fired engine, wherein the solar non-utilization mode includes: coal briquettes for producing coal slurry A pretreatment step; A coal gasification step of supplying the coal slurry and air obtained in the coke pretreatment step with a gasifier and oxidizing and gasifying the coal slurry in a gasifier; A gas purification step of purifying the syngas generated in the gasifier; A blending engine power generation step of producing electricity by supplying a part of the syngas purified in the gas purification step and diesel to the blending engine of the compression ignition method; And an FT synthesis process for obtaining gasoline and diesel by supplying the remainder of the synthesis gas purified in the gas purification process to the FT reactor, and provides a standalone energy production plant system using a coal resource.

Exhaust gas (OFF GAS) of the FT reactor supplied to the all-engine in the solar light utilization mode may be: hydrogen content 60 ~ 80v%, carbon dioxide content 10 ~ 20v% and carbon monoxide content 10 ~ 20v%.

Synthetic gas supplied to the mixed-use engine in the solar non-utilization mode may be: nitrogen content 40 ~ 70v%, hydrogen content 10 ~ 30v%, carbon dioxide content 7 ~ 13v% and carbon monoxide content 10 ~ 20v%.

Coal pretreatment process in the solar light utilization mode and non-photovoltaic mode is: wet grinding, flotation and concentration of coal ore to produce a coal slurry having ash content of less than 12wt% and coal content of 50 ~ 80wt% It may be.

The coal pretreatment process includes a wet grinding step of wet grinding coal ore; A flotation step of transferring coal of at least 75 mesh of coal pulverized in the wet grinding step to a flotation and then adding a collecting agent and a foaming agent and then performing a flotation step; Concentration step of concentrating by transferring the coal selected in the flotation concentrate to the sedimentation concentrator.

The gas purification process may be to purify the synthesis gas generated in the gasifier through a cyclone, a dust filter and a deoiler.

The stand-alone energy production plant system using the coal resources according to the present invention has the advantage of improving the utilization of low-grade low-grade coal by producing a high-quality coal slurry through the coal pretreatment process while using low-grade coal ore.

In addition, the stand-alone energy production plant system using coal resources according to the present invention has the advantage that it is possible to obtain gasoline and diesel through the FT synthesis process while using low-grade coal.

In addition, the stand-alone energy production plant system according to the present invention can be easily supplied with high-purity oxygen into the gasifier by obtaining the oxygen by electrolysis of water using solar light to obtain the synthesis gas and generate electricity by using it as well. By using the air to obtain synthetic gas even in an environment where solar power cannot be used, the system can be used to generate power, thereby utilizing coal resources, generating efficiency and producing gasoline or diesel with or without solar light. It has the advantage of maximizing productivity.

1 is a view showing a stand-alone energy production plant system using coal resources according to an embodiment of the present invention.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings, which are presented to aid the understanding of the present invention, but the present invention is not limited thereto.

1 is a view showing a stand-alone energy production plant system using coal resources according to an embodiment of the present invention.

As shown in FIG. 1, the standalone energy production plant system using coal resources according to the present invention includes a solar light utilization mode and a solar non-utilization mode.

First, the solar light utilization mode will be described.

The solar light utilization mode is a coal preparation pretreatment process 110 for producing a coal slurry; An electrolysis process 220 of producing electricity through photovoltaic power generation 210 and obtaining oxygen and hydrogen by electrolyzing water with the produced electricity; A coal gasification step (120) of supplying oxygen obtained in the electrolysis step (220) and coal slurry obtained in the coal briquetting pretreatment step (110) to a gasifier to oxidize and gasify the coal slurry in a gasifier; A gas refining process 130 for refining the syngas generated in the gasifier; A FT synthesis step 140 for obtaining gasoline and diesel by supplying the synthesis gas purified in the gas purification step 130 and hydrogen obtained in the electrolysis step 220 to an FT reactor; And an all-engine engine power generation process 310 for supplying the discharge gas (OFF GAS) of the FT reactor to the spark-ignition-type all-engine engine to produce electricity.

Coal pretreatment process 110 is a process for producing a coal slurry having a ash content of less than 12wt% and a coal content of 50 ~ 80wt% by wet grinding, flotation and concentration of coal ore.

The coal ore may be peat, peat, lignite, bituminous or anthracite ore, and the present invention uses a low quality coal ore.

As is well known, low-grade coal contains ash and the like. Ash is slowly heated while circulating the humidity sample in air, and burned at 800 ± 10 ° C. to ash, so that the amount of inorganic matter remaining and the amount of moisture sample The weight ratio is expressed in%, and so-called silica minerals such as clay and silicon dioxide occupy most of them. These ashes are a harmful component to coal and reduce thermal efficiency.

Accordingly, in the present invention, the ash content is lowered to 12 wt% or less, preferably 5 to 12 wt%, through the coal pretreatment process 110, thereby making it possible to utilize the high-quality coal fuel to increase thermal efficiency.

According to the present invention, the genital pretreatment process 110 includes a wet grinding step of wet grinding coal ore; A flotation step of transferring coal of at least 75 mesh of coal pulverized in the wet grinding step to a flotation and then adding a collecting agent and a foaming agent and then performing a flotation step; It comprises a; concentration step of concentrating by transferring the coal selected in the flotation concentrate to the sedimentation concentrator.

Here, the wet grinding may be performed using a ball mill or the like, and grinding is performed while supplying water. For smooth grinding, the ratio of coal ore and water during grinding is preferably 1: 0.8 to 1.5. After the wet grinding, more coal is transferred to the flotation, based on the crushed particle size of about 75 mesh, and then again subjected to the wet grinding step.

The coal transported to the floating beneficiary is added with a collecting agent and a foaming agent to process the flotation. Herein, kerosene may be used as the collecting agent, and AF-65, which is widely known as an alcohol-based foaming agent, may be used as the foaming agent. However, the above-described scavenger and foaming agent is only an example and can be used without limitation.

The addition amount of the collecting agent and the foaming agent need not necessarily be limited, but it is preferable to add within 0.01 to 5wt% based on 100wt% of the coal-containing liquid to be transferred to the flotation.

The tailings (Tailing) remaining after the flotation step is transferred to the storage tank and stored.

After the flotation step, the coal selected from the flotation concentrate is transferred to the sedimentation concentrator and concentrated. At this time, the concentration is preferably a coal slurry having a coal content of 50 ~ 80wt%. If the coal content in the coal slurry is less than 50 wt% of coal, there is a problem that the gasification efficiency is lowered, if the content of coal is more than 80wt% there is a problem that the injection to the gasifier is not easy to increase the viscosity.

The flotation beneficiator and the sedimentation concentrator can be used without limitation the apparatus generally used in the process of coal mining, the present invention is not limited thereto. However, in the present invention, while using a low-grade coal ore using such a device to convert to high-quality coal fuel, in particular to produce a high-quality coal slurry that can be usefully used in the coal gasification process 120 to be described later It has that feature.

Apart from the coke pretreatment process 110, the coal gasification process 120 to be described later undergoes a process for obtaining oxygen used as an oxidant of the coal slurry. According to the present invention, oxygen is obtained through an electrolysis process 220 of producing electricity through photovoltaic power generation 210 in the photovoltaic utilization mode and electrolyzing water with the produced electricity to obtain oxygen and hydrogen.

Photovoltaic power generation 210 is a commonly used technology, and since the technology of obtaining water and oxygen and hydrogen through electrolysis using electricity is also a commonly used technology, a detailed description thereof will be omitted.

In the present invention, by using the photovoltaic power generation 210 and the electrolysis process 220 to obtain oxygen and hydrogen, the obtained oxygen is supplied to the gasifier, the obtained hydrogen is supplied to the FT synthesis reactor, the gasification efficiency of coal slurry In addition, to increase the gasoline and diesel productivity efficiency using the synthesis gas in the FT synthesis process (140).

The coal gasification process 120 in the solar light utilization mode supplies oxygen obtained in the electrolysis process 220 and coal slurry obtained in the coal briquetting pretreatment process 110 to a gasifier to oxidize the coal slurry in a gasifier. It is a process of gasifying.

The gasification is carried out by injecting a coal slurry using oxygen under high temperature conditions in the gasifier to obtain a synthesis gas as a product. At this time, in order to facilitate oxidation of the coal slurry, high temperature conditions are 700 ° C to 1,500 ° C, preferably 1,200 ° C to 14,00 ° C. Gasifiers can be used in general, without limitation, the present invention is not limited thereto.

Gas purification process 130 is a process for purifying the synthesis gas generated in the gasifier. More specifically, the gas purification step 130 is a step of removing and purifying impurities such as sulfur compounds from the synthesis gas generated in the coal gasification step 120.

The gas purification process 130 may be performed by sequentially passing the syngas generated in the gasifier through a cyclone, a dust filter, and a deoiler. The cyclone or dust filter and the deoiler used in the gas purification process 130 may be those commonly used in the art.

In a typical combined cycle power generation system, power generation is performed using a synthesis gas that has undergone the gas purification process 130.

However, in the solar light utilization mode of the present invention, the generated synthesis gas is subjected to the FT synthesis process 140.

The FT synthesis process 140 is a process of obtaining gasoline and diesel in the presence of a catalyst by supplying the synthesis gas purified in the gas purification process 130 to the FT reactor. The FT synthesis process 140 for obtaining gasoline and diesel in the presence of a catalyst using a synthesis gas is already commercialized, and thus, the present invention provides a detailed description of gasoline and diesel using the FT reactor and the method. Will be omitted.

According to the present invention, the exhaust gas of the FT reactor in the solar light utilization mode (off gas) is supplied to a spark ignition type all-electric engine to go through an all-engine power generation process 310 for producing electricity.

In general, the off gas generated in the FT reactor has a low calorific value. In the present invention, the discarded off gas is used as a fuel for power generation.

In other words, in the existing combined power generation system, the power generation is performed using the synthesis gas that has undergone the gas purification process 130, but in the present invention, power generation is performed by using the off-gas of the FT reactor. It has that feature.

In particular, according to the present invention, when using oxygen obtained by electrolyzing water as the oxidant used in the coal gasification process 120, the off-gas of the FT reactor does not contain nitrogen.

According to the present invention, the exhaust gas of the FT reactor (OFF GAS), that is, the fuel supplied to an all-electric engine for power generation may have a hydrogen content of 60 to 80v%, a carbon dioxide content of 10 to 20v%, and a carbon monoxide content of 10 to 20v%. .

As is well known, the off gas has a calorific value of about 2,000 kcal / m ^{3, which} is only 0.1 to 0.2 times that of diesel or gas fuel. Thus, in order to burn off gas having a relatively low calorific value, the present invention uses an all-fire engine that burns by a spark ignition method.

The burnout engine can be used without limitation, those generally used in the art.

In the above-described solar light utilization mode, it is possible to secure sufficient efficiency during the day, that is, in an environment in which electricity is produced by sunlight and electrolysis thereof to obtain oxygen. But at night or on cloudy days, its efficiency cannot be achieved. Therefore, the present invention has the greatest feature in that the solar non-utilization mode can be performed in consideration of such an environment.

Next, the solar non-utilization mode will be described.

The solar non-utilization mode is a coal pretreatment process 110 for producing a coal slurry; A coal gasification step (120) of supplying the coal slurry and air obtained in the coal preparation pretreatment step (110) to a gasifier to oxidize and gasify the coal slurry in the gasifier; A gas refining process 130 for refining the syngas generated in the gasifier; A mixed gasoline power generation process (320) for producing electricity by supplying a portion of the syngas purified in the gas purification process (130) and diesel to a mixed gas engine of a compression ignition method; And an FT synthesis process 140 for obtaining gasoline and diesel by supplying the remainder of the synthesis gas purified in the gas purification process 130 to the FT reactor.

Here, the coal preparation pretreatment process 110 is the same as described in the foregoing solar light utilization mode, and a description thereof will be omitted.

In the solar non-utilization mode, the coal gasification process 120 is a process of supplying the coal slurry and air obtained in the coke pretreatment process 110 to a gasifier to oxidize and gasify the coal slurry in the gasifier.

In this case, in order to increase the gasification efficiency, it is preferable to use compressed air as the air. That is, the coal gasification process 120 in the solar non-utilization mode is to inject the coal slurry using compressed air under high temperature conditions in the gasifier to react to obtain the synthesis gas as a product. At this time, in order to facilitate oxidation of the coal slurry, high temperature conditions are 700 ° C to 1,500 ° C, preferably 1,200 ° C to 1,400 ° C, and compressed air uses air containing oxygen compressed at a pressure of 0 to 30 atmospheres.

As described above in the solar light utilization mode, the gasifier may be used without limitation in the art, and the present invention is not limited thereto.

Since the gas purification process 130 is the same as described in the solar light utilization mode, a description thereof will be omitted.

According to the present invention, a part of the purified synthesis gas and the diesel in the gas refining process 130 are supplied to the mixed ignition engine of the compression ignition method to undergo the mixed power generation process 320 for producing electricity.

The mixing engine power generation process 320 is to generate power by driving the engine by using the synthesis gas generated by using the air, the synthesis gas generated by using the air is mixed with diesel because the change in the components are severe. It is possible to generate more stable power by combustion.

The content of diesel in the fuel supplied to the mixed engine, that is, the fuel composed of diesel and syngas may be 30v% to 80v% of the total fuel. When diesel is contained within the above range, it is possible to stably drive the mixed engine.

At this time, the synthesis gas supplied to the mixed gas engine has a relatively high nitrogen content as compressed air is used to oxidize the coal slurry. According to one embodiment of the present invention, the syngas supplied to the mixed engine may have a nitrogen content of 40 to 70v%, a hydrogen content of 10 to 30v%, a carbon dioxide content of 7 to 13v%, and a carbon monoxide content of 10 to 20v%.

The syngas and diesel in the above range is supplied to the mixed gas engine to generate power, and the compression ignition type mixed gas engine can be used without limitation.

Synthesis of the remainder except the syngas supplied to the mixed engine of the synthesis gas purified in the gas purification process 130 is passed through the FT synthesis process 140 to be supplied to the FT reactor to obtain gasoline and diesel.

Since the FT synthesis process 140 is the same as described in the solar light utilization mode, a detailed description thereof will be omitted.

The above-described photovoltaic non-utilization mode can ensure sufficient system utilization when sunlight cannot be utilized.

The stand-alone energy production plant system using the coal resources according to the present invention has the advantage of improving the utilization of low-grade low-grade coal by manufacturing a high-quality coal slurry through the coal pretreatment process 110 while using low-grade coal ore. There is this.

In addition, the stand-alone energy production plant system using coal resources according to the present invention has the advantage that it is possible to obtain gasoline and diesel through the FT synthesis process 140 while using low-grade coal.

In addition, the stand-alone energy production plant system according to the present invention can be easily supplied with high-purity oxygen into the gasifier by obtaining the oxygen by electrolysis of water using solar light to obtain the synthesis gas and generate electricity by using it as well. By constructing a system that can obtain syngas using air and generate power even in an environment where solar power cannot be utilized, it can maximize utilization of coal resources, power generation efficiency, and productivity of producing gasoline or diesel. There is this.

Detailed description for carrying out the present invention described above with reference to the preferred embodiment of the present invention, but those skilled in the art or those skilled in the art having ordinary knowledge in the technical field described in the claims to be described later It will be understood that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention.

110: coal pretreatment step 120: coal gasification step
130: gas purification process 140: FT synthesis process
210: solar power 220: electrolysis process
310: burner engine power generation process 320: mixed engine power generation process

Claims (6)

In the stand-alone energy production plant system using coal resources gasification using coal, and producing electricity using the same,
The stand-alone energy production plant system comprises a solar light utilization mode and solar non-utilization mode,
The solar light utilization mode includes: a coal briquetting process for producing a coal slurry; An electrolysis process of producing electricity through photovoltaic power and electrolyzing water with the produced electricity to obtain oxygen and hydrogen; A coal gasification step of supplying oxygen obtained in the electrolysis step and coal slurry obtained in the coke pretreatment step with a gasifier to oxidize and gasify the coal slurry in a gasifier; A gas purification step of purifying the syngas generated in the gasifier; A FT synthesis step of obtaining gasoline and diesel by supplying syngas purified in the gas purification step and hydrogen obtained in the electrolysis step to an FT reactor; And an all-engine power generation process for producing electricity by supplying the off-gas (OFF GAS) of the FT reactor to the all-engine.
The solar non-utilization mode includes: a coal feed pretreatment process for producing a coal slurry; A coal gasification step of supplying the coal slurry and air obtained in the coke pretreatment step with a gasifier and oxidizing and gasifying the coal slurry in a gasifier; A gas purification step of purifying the syngas generated in the gasifier; A blending engine power generation step of producing electricity by supplying a part of the syngas purified in the gas purification step and diesel to the blending engine; And an FT synthesis step of obtaining gasoline and diesel by supplying the remainder of the synthesis gas purified in the gas refining process to an FT reactor.
The method of claim 1, wherein the off-gas (OFF GAS) of the FT reactor supplied to the all-engine in the solar light utilization mode is:
Stand-alone energy production plant system using coal resources, characterized in that the hydrogen content of 60 ~ 80v%, carbon dioxide content 10 ~ 20v% and carbon monoxide content 10 ~ 20v%.
The method according to claim 1, wherein the syngas supplied to the mixed engine in the solar non-utilization mode is:
Stand-alone energy production plant system using coal resources, characterized in that the nitrogen content of 40 ~ 70v%, hydrogen content 10 ~ 30v%, carbon dioxide content 7 ~ 13v% and carbon monoxide content 10 ~ 20v%.
The process of claim 1, wherein the coal briquetting process in the solar light utilization mode and the solar non-utilization mode is:
A standalone energy production plant system using coal resources, characterized in that the wet grinding, barge and concentration of coal ore to produce a coal slurry having an ash content of less than 12wt% and a coal content of 50 ~ 80wt%.
The process of claim 4, wherein the coal briquetting process is:
A wet grinding step of wet grinding coal ore; A flotation step of transferring coal of at least 75 mesh of coal pulverized in the wet grinding step to a flotation and then adding a collecting agent and a foaming agent and then performing a flotation step; Stand-alone energy production plant system using a coal resource, characterized in that it comprises a; enrichment step of concentrating by transferring the coal selected in the flotation concentrate to the sedimentation concentrator.
The process of claim 1, wherein the gas purification process is:
Independent energy production plant system using coal resources, characterized in that the synthesis gas generated in the gasifier is purified by passing through a cyclone, dust filter and deoiler.

Images