CN212404020U - Clean coal system of coal slime or low order coal self-drying preparation - Google Patents
Clean coal system of coal slime or low order coal self-drying preparation Download PDFInfo
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- CN212404020U CN212404020U CN202020678573.0U CN202020678573U CN212404020U CN 212404020 U CN212404020 U CN 212404020U CN 202020678573 U CN202020678573 U CN 202020678573U CN 212404020 U CN212404020 U CN 212404020U
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Abstract
The utility model discloses a clean coal system of coal slime or low order coal self-drying preparation, including coal slime/low order fine coal system piece device, design coal cinder orbit, heating chamber, dry distillation room, cooling chamber, clean coal transfer room, combustion chamber, flue gas pipeline, pump machine, tail gas processing apparatus, the multiplexing pipeline of tail gas of going out of the kiln, the system passes through atmospheric pressure and tail gas retrieval and utilization speed in pump machine and the automatically controlled governing valve control system. A gas mixing chamber is arranged outside a dry distillation chamber in the system, the concentration of combustible gas and the concentration of oxygen in coal gas are controlled by an electric control fan, a gas outlet pipe is arranged in the dry distillation chamber, and a temperature sensor is arranged at the top of the gas outlet pipe to monitor the temperature of the dry distillation chamber. The coal slime or low-rank coal treated by the system has lower volatile components and sulfur components and can be directly used for civil combustion.
Description
Technical Field
The utility model relates to a clean coal preparation technique especially relates to a clean coal system of coal slime or low order coal self-drying preparation.
Background
In the current energy structure, petroleum and natural gas resources are deficient, the coal reserves are relatively rich, the coal reserves account for nearly 70 percent of the energy structure and are dominant, and more than 55 percent of the energy structure is low-rank coal with low coalification degree. However, because the water content of the low-rank coal is high, the direct combustion or gasification efficiency is low, and the resource value of the low-rank coal cannot be fully utilized in the prior art, the coal resource is greatly wasted. Meanwhile, a large amount of water-containing semi-solid matters, namely coal slime, is generated in the coal mine washing process, and the coal mine washing process is waste in the coal mine production process due to high ash content and low calorific value. The utilization of low-rank coal and coal slurry is greatly limited due to factors such as ash content, water content, sulfur content and the like.
In the prior art, high-efficiency pyrolysis is mostly taken as a guide, oil gas resources existing in coal are extracted, and residual semicoke is combusted to generate electricity or is directionally converted into fuels and chemicals after gasification. The procedure is complex and the conditions for obtaining the product are harsh. Therefore, there is a need to provide a method and system for producing clean coal directly from coal slurry or low-rank coal.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a clean coal system of coal slime or low order coal self-drying preparation.
The utility model aims at realizing through the following technical scheme:
the utility model discloses a clean coal system of coal slime or low order coal self-drying preparation, including coal slime/low order fine coal briquetting device and design coal cinder orbit, set gradually heating chamber, dry distillation room, cooling chamber, clean coal transfer room of going out of the kiln at design coal cinder orbit along the flow direction of design coal cinder, heating chamber, dry distillation room and cooling chamber are fixed by the refractory wall, and set up the combustion chamber in heating chamber and dry distillation indoor portion, clean coal goes out of the kiln both ends of transfer room and sets up by the check door respectively;
a flue gas pipeline is arranged at the front end of the warming chamber, and a flue gas outlet after combustion in the combustion chamber is respectively connected with a tail gas treatment device and a tail gas multiplexing pipeline through a pump and the flue gas pipeline;
an electric control regulating valve is arranged at the front end of a flue gas inlet of the tail gas treatment device;
and the outlet of the tail gas multiplexing pipeline is respectively connected to the tail end of the cooling chamber and the clean coal discharging transfer chamber.
By the foregoing the technical scheme the utility model provides a can see out, the embodiment of the utility model provides a coal slime or low order coal are from drying preparation clean coal system, this system need not to provide the heat source through the outside, reduces the loss of heat energy simultaneously, realizes that the one-step method utilizes coal slime or low order coal to prepare clean coal, has easy operation, and characteristics that factor of safety is high obtain the product and can directly be used for civilian burning etc..
Drawings
Fig. 1 is a schematic structural diagram of a system for preparing clean coal from coal slime or low-rank coal by self-drying provided by the embodiment of the utility model.
Fig. 2 is a schematic structural view of the warming chamber in the embodiment of the present invention.
FIG. 3 is a schematic view of the structure of the dry distillation chamber in the embodiment of the present invention.
In the figure:
1-coal slime/low-order pulverized coal blocking device; 2-shaping the coal block running track; 3-liter greenhouse; 4-a dry distillation chamber; 5-cooling chamber; 6-clean coal is taken out of the kiln and transferred to the room; 7-refractory wall; 8-a combustion chamber; 9-a one-way door; 10-flue gas duct; 11-a pump; 12-an electrically controlled regulating valve; 13-a tail gas treatment device; 14-a tail gas reuse pipeline;
401-gas conveying piping; 402-a gas blending chamber; 403-electric control fan; 404-a mixed gas output pipe; 405-a gas sensor; 406-a burner; 407-gas delivery pipe; 408-temperature sensor.
Detailed Description
Embodiments of the present invention will be described in further detail below. Details not described in the embodiments of the present invention belong to the prior art known to those skilled in the art.
The utility model discloses a clean coal system of coal slime or low order coal preparation from drying, the concrete implementation of its preferred is as shown in fig. 1 to fig. 3:
the coal slurry/low-order pulverized coal block making device comprises a coal slurry/low-order pulverized coal block making device and a shaped coal block running track, wherein a temperature rising chamber 3, a dry distillation chamber 4, a temperature reduction chamber 5 and a clean coal out-of-kiln transfer chamber 6 are sequentially arranged on the shaped coal block running track 2 along the flow direction of a shaped coal block, the temperature rising chamber 3, the dry distillation chamber 4 and the temperature reduction chamber 5 are fixed by a fire-resistant wall 7, combustion chambers 8 are arranged inside the temperature rising chamber 3 and the dry distillation chamber 4, and two ends of the clean coal out-of-kiln transfer chamber 6 are respectively provided with a one-way door 9;
a flue gas pipeline 10 is arranged at the front end of the warming chamber 3, and a flue gas outlet of the combustion chamber 8 after combustion is respectively connected with a tail gas treatment device 13 and a tail gas multiplexing pipeline 14 through a pump 11 and the flue gas pipeline 10;
an electric control regulating valve 12 is arranged at the front end of a flue gas inlet of the tail gas treatment device 13;
the outlet of the tail gas multiplexing pipeline 14 is respectively connected to the tail end of the cooling chamber 5 and the clean coal discharging transfer chamber 6.
The top of the combustion chamber 8 is made of refractory brick materials, the bottom of the combustion chamber is made of heat storage ceramic materials, and the inner cavity of the combustion chamber is isolated from the heating chamber 3, the dry distillation chamber 4 and the cooling chamber 5.
The middle part of the dry distillation chamber 4 is provided with a gas conveying pipeline 401, the outlet of the gas conveying pipeline 401 is connected with a gas mixing chamber 402, and the gas mixing chamber 402 is connected with the combustion chamber 8 through a mixed gas output pipe 404.
The gas mixing chamber 402 is provided with an electric control fan 403, the mixed gas output pipe 404 is provided with a gas sensor 405, the dry distillation chamber 4 is provided with a gas output pipe 407, the top of the gas output pipe 407 is provided with a temperature sensor 408, and the top of the combustion chamber is provided with a burner 406.
The method for preparing clean coal by self-drying coal slime or low-rank coal comprises the following steps:
the shaped coal blocks sequentially flow through a heating chamber 3, a dry distillation chamber 4, a cooling chamber 5 and a clean coal discharging transfer chamber 6 on the operation track 2, and are heated by a combustion chamber 8 in the heating chamber 3 and the dry distillation chamber 4;
the flue gas combusted in the combustion chamber 8 is pumped out by a pump 11 and enters a tail gas treatment device 13 and a tail gas multiplexing pipeline 14 through a flue gas pipeline 10 arranged at the front end of the warming chamber 3; the tail gas amount of the flue gas entering the tail gas treatment device 13 and the tail gas multiplexing pipeline 14 is controlled by an electric control regulating valve 12 arranged at the front end of the tail gas treatment device 13;
tail gas of the tail gas multiplexing pipeline 14 respectively enters the tail end of the cooling chamber 5 and the clean coal discharging transfer chamber 6;
the gas in the inner cavity of the combustion chamber 8 is not directly communicated with the temperature rising chamber 3, the dry distillation chamber 4 and the temperature reduction chamber 5.
Gas generated by coal carbonization in the carbonization chamber 4 enters a gas mixing chamber 402 through the gas conveying pipeline 401 and is mixed by an electric control fan 403;
the mixed gas enters the combustion chamber 8 through a mixed gas output pipe 404; the gas sensor 405 provided in the mixed gas output pipe 404 is used to monitor the methane concentration, the hydrogen concentration, the carbon monoxide concentration and the oxygen concentration.
According to an explosion limit formula L which is 1/(Y1/L1+ Y2/L2+ Y3/L3), calculating a comprehensive lower explosion limit of the mixed combustible gas, controlling the concentration of each combustible gas in the blending chamber by controlling the electric control fan 403 to enable the blended gas to be far away from the lower explosion limit, simultaneously, only maintaining the sufficient combustion of each combustible gas by the oxygen amount without excess oxygen, and continuously monitoring data by the gas sensor 405 and programming and controlling the data by a programmable controller;
in the above formula: y1, Y2 and Y3 respectively represent the compositions of different combustible gases in the mixture, and L1, L2 and L3 respectively represent the corresponding explosion limits of each component of the mixed gas.
Compared with the prior art, the utility model has the advantages of:
the method does not need to provide a heat source from the outside, reduces the loss of heat energy, realizes the preparation of clean coal by using coal slime or low-rank coal in one step, has the characteristics of simple operation and high safety factor, and can directly use the obtained product for civil combustion and the like.
The specific embodiment is as follows:
fig. 1 is the utility model provides a coal slime or low order coal from drying preparation clean coal system structure schematic diagram that dries, fig. 2 is the embodiment of the utility model provides an in the room structure schematic diagram that rises, fig. 3 is the embodiment of the utility model provides an in the embodiment of the room structure schematic diagram that distils.
As shown in the attached figures 1, 2 and 3, refractory bricks are used on the top of the refractory wall and the combustion chamber, a honeycomb heat storage ceramic body is used at the bottom of the combustion chamber, and heat insulation and high temperature resistant materials are used in the mixing chamber, the mixed gas output pipe and the gas output pipe. The combustor is located the combustion chamber top, uses propane as combustor starting fuel, heats up the combustion chamber, and coal slime or low order fine coal make honeycomb coal form through the briquetting device, gets into the room of rising temperature through design coal cinder orbit, and the room of rising temperature dwell time is 1 hour, and pending coal cinder heats up and gets into the dry distillation room through the orbit after, and the temperature sensor shows that the temperature stops propane input when exceeding 950 degrees. The retention time of the shaped coal blocks in the dry distillation chamber is 1 hour, and then the shaped coal blocks leave the dry distillation chamber and enter the cooling chamber. The temperature in the dry distillation chamber is controlled by the power of a pump and an electric control fan connected to the gas mixing chamber. The gas taking port for the crude gas to enter the mixing chamber is arranged on the interface of the dry distillation chamber and the cooling chamber, so that the gas at the highest temperature section of the dry distillation chamber and the cooling section is taken out, and the gas at the two ends in the kiln flows to the gas taking port in the opposite direction. The shaped coal blocks are subjected to high-temperature carbonization in the carbonization chamber to release a large amount of crude gas, the gas pressure in the area is higher than the atmospheric pressure under the high-temperature condition, so that the crude gas enters the gas mixing chamber through the gas conveying pipeline, and the gas inlet speed of the electric control fan is regulated and controlled according to the concentrations of methane, hydrogen and carbon monoxide of the gas sensor and the temperature of the temperature sensor, so that the gas in the combustion chamber is in a safe combustion concentration range, and the temperature of the carbonization chamber is maintained at 950 ℃. The pump pumps the waste gas combusted in the combustion chamber at the upper part of the carbonization chamber into the combustion chamber at the upper part of the warming chamber and further into a flue gas pipeline, the tail gas flow of the flue gas entering the tail gas treatment device and the tail gas multiplexing pipeline is controlled by an electric control regulating valve arranged at the front end of the tail gas treatment device, the tail gas multiplexing pipeline is respectively connected to the tail end of the cooling chamber and the clean coal discharging transfer chamber, and the tail gas multiplexing system controls the oxygen concentration in the warming chamber and the carbonization chamber to be close to 0. The shaping coal briquette enters the temperature reduction chamber, is cooled through cooled multiplexing tail gas, enters the clean coal discharging transfer chamber through the one-way door and is moved out, and due to the tail gas multiplexing system, the air pressure inside the clean coal discharging transfer chamber is higher than the atmospheric pressure, and the temperature rise chamber, the carbonization chamber and the temperature reduction chamber are ensured to have no oxygen interference.
And calculating the comprehensive lower explosion limit of the mixed combustible gas according to an explosion limit formula L/(Y1/L1 + Y2/L2+ Y3/L3) (wherein Y1, Y2 and Y3 represent different combustible gas compositions in the mixture, and L1, L2 and L3 represent corresponding explosion limits of all components of the mixed gas), and controlling the concentration of all combustible gases in the blending chamber by controlling an electrically-controlled fan to enable the blended gas to be far away from the lower explosion limit, and simultaneously, the oxygen amount can only maintain the full combustion of all the combustible gases without excess oxygen. The continuous monitoring data through the sensor is programmed and controlled through a programmable controller.
The air pressure difference between the two sides of the coal block inlet air door is always kept to be zero so as to avoid the entering of outside air and the overflow of coal gas in the kiln. The zero pressure difference is controlled by the tail gas reuse amount, the tail gas amount is controlled by a pump and an electric control valve, the air quantity of the pump is controlled by a frequency converter, and the frequency converter is controlled by the online monitoring data of a zero pressure difference sensor through a programmable controller program.
The product obtained by the method can be directly used for civil combustion and the like.
The above description is only for the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are all covered by the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (4)
1. A system for preparing clean coal by self-drying coal slime or low-rank coal is characterized by comprising a coal slime/low-rank pulverized coal block making device and a shaped coal block running track, wherein a temperature rising chamber (3), a dry distillation chamber (4), a temperature reduction chamber (5) and a clean coal out-of-kiln transfer chamber (6) are sequentially arranged on the shaped coal block running track (2) along the flow direction of the shaped coal block, the temperature rising chamber (3), the dry distillation chamber (4) and the temperature reduction chamber (5) are fixed by a fire-resistant wall (7), combustion chambers (8) are arranged inside the temperature rising chamber (3) and the dry distillation chamber (4), and two ends of the clean coal out-of-kiln transfer chamber (6) are respectively provided with a one-way door (9);
a flue gas pipeline (10) is arranged at the front end of the warming chamber (3), and a flue gas outlet after combustion in the combustion chamber (8) is respectively connected with a tail gas treatment device (13) and a tail gas multiplexing pipeline (14) through a pump (11) and the flue gas pipeline (10);
an electric control regulating valve (12) is arranged at the front end of a flue gas inlet of the tail gas treatment device (13);
and the outlet of the tail gas multiplexing pipeline (14) is respectively connected to the tail end of the cooling chamber (5) and the clean coal discharging transfer chamber (6).
2. The system for preparing clean coal by self-drying coal slime or low-rank coal as claimed in claim 1, wherein the top of the combustion chamber (8) is made of refractory brick material, the bottom of the combustion chamber is made of heat-storage ceramic material, and the inner cavities of the combustion chamber are isolated from the heating chamber (3), the carbonization chamber (4) and the cooling chamber (5).
3. The system for preparing clean coal by self-drying coal slime or low-rank coal as claimed in claim 2, wherein a gas conveying pipeline (401) is arranged in the middle of the dry distillation chamber (4), the outlet of the gas conveying pipeline (401) is connected with a gas mixing chamber (402), and the gas mixing chamber (402) is connected with the combustion chamber (8) through a mixed gas output pipe (404).
4. The system for preparing clean coal by self-drying coal slime or low-rank coal as claimed in claim 3, wherein the gas mixing chamber (402) is provided with an electric control fan (403), the mixed gas output pipe (404) is provided with a gas sensor (405), the dry distillation chamber (4) is provided with a gas output pipe (407), the top of the gas output pipe (407) is provided with a temperature sensor (408), and the top of the combustion chamber is provided with a burner (406).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020678573.0U CN212404020U (en) | 2020-04-28 | 2020-04-28 | Clean coal system of coal slime or low order coal self-drying preparation |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020678573.0U CN212404020U (en) | 2020-04-28 | 2020-04-28 | Clean coal system of coal slime or low order coal self-drying preparation |
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| CN212404020U true CN212404020U (en) | 2021-01-26 |
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| CN202020678573.0U Active CN212404020U (en) | 2020-04-28 | 2020-04-28 | Clean coal system of coal slime or low order coal self-drying preparation |
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