A safe preparation system for high-volatile coal

Abstract

The present invention discloses a safe preparation system for high-volatile coal, which includes: a coal mill; a powder collector; a coal powder bin; a coal conveying pipe, which is respectively arranged between the coal mill and the powder collector, and between the powder collector and the coal powder bin; a nitrogen making device, which is respectively connected to the coal mill, the powder collector, and the coal powder bin, and is used to prepare nitrogen and inject nitrogen into the coal mill, the powder collector, and the coal powder bin; an induced draft unit, which is connected to the air inlet of the coal mill, and is used to introduce the exhaust gas of the hot blast furnace into the system after the system is shut down; and a circulation pipe unit, which is used to circulate and transport nitrogen and the exhaust gas of the hot blast furnace. In each link of the preparation of coal powder, the present invention performs atomized nitrogen filling on all key parts of the coal powder circulation, so that the nitrogen is fully mixed with the coal powder, thereby achieving the purpose of isolating oxygen, so that the system greatly reduces the possibility of coal powder explosion, and after the pulverizing stops, it is cooled by using a self-circulating mixed gas, which has a very great improvement in reducing costs.

Description

Technical Field

[0001] The invention relates to the technical field of high-volatile coal preparation, and in particular to a high-volatile coal safety preparation system. Background Art

[0002] The power plant coal mill is the main equipment of the coal powder preparation system of the thermal power station. It is also suitable for the powder making systems of the cement industry, metallurgical industry, chemical industry, sugar industry, etc. It is widely used to crush coal of various hardness and belongs to the professional equipment for the preparation and processing of auxiliary materials for blast furnace ironmaking. In order to reduce fuel costs, improve quality and efficiency, and adapt to changes in the fuel market, by using full bituminous coal as an economic coal type, due to the poor stability of this coal type, it is easy to explode. During the preparation process, the accumulated powder inside the coal mill, the powder collector, the coal powder bin and the coal conveying pipe is combined with oxygen and is very easy to cause deflagration. In order to solve this problem, this scheme adopts the nitrogen sealing method to prepare high-volatile coal powder. Nitrogen sealing is a commonly used explosion-proof measure, which can effectively solve the problem of deflagration caused by the accumulated powder inside the coal mill, the powder collector, the coal powder bin and the coal conveying pipe combining with oxygen. Summary of the invention

[0003] In order to solve the above technical problems, the present invention provides a high-volatile coal safety preparation system, comprising: a coal mill; a powder collector; a coal powder bin;

[0004] Coal conveying pipes are respectively arranged between the coal mill and the powder collector, and between the powder collector and the coal powder bin;

[0005] A nitrogen generator is connected to the coal mill, the coal powder collector and the coal powder bin, respectively, and is used to prepare nitrogen and inject nitrogen into the coal mill, the coal powder collector and the coal powder bin;

[0006] An induced draft unit connected to the air inlet of the coal mill, the induced draft unit being used to introduce the exhaust gas of the hot blast furnace into the system after the system is shut down;

[0007] The circulation pipe unit is used to circulate nitrogen and waste gas from the hot blast furnace.

[0008] Furthermore, the air induction unit comprises:

[0009] An induced draft fan, used to introduce exhaust gas from the hot blast furnace into the circulating air duct;

[0010] A heating furnace is connected to the induced draft fan, and the heating furnace is used to heat the exhaust gas.

[0011] Further, the circulation pipe unit comprises:

[0012] a first circulating gas pipe connected between the nitrogen generating equipment and the coal mill, the first circulating gas pipe being used to transport the prepared nitrogen to the coal mill;

[0013] A second circulating air pipe is connected between the nitrogen generating device and the powder collector, and the second circulating air pipe is used to transport the prepared nitrogen to the powder collector;

[0014] a third circulating gas pipe connected between the nitrogen generating equipment and the pulverized coal bin, wherein the first circulating gas pipe is used to transport the prepared nitrogen to the pulverized coal bin;

[0015] The fourth circulating air pipe is connected between the coal mill and the powder collector. The first circulating air pipe is used to transport the nitrogen in the powder collector and the exhaust gas of the hot blast furnace back to the coal mill.

[0016] Furthermore, an exhaust fan is provided on the fourth circulating air pipe, and the exhaust fan is used to suck out the gas in the powder collector to circulate the gas in the system.

[0017] Furthermore, a booster tank is provided on the pulverized coal bin, and the booster tank is used to increase the air pressure to discharge the pulverized coal in the pulverized coal bin;

[0018] A pressure relief pipe is provided between the boost tank and the coal delivery pipe, and the pressure relief pipe is used to transport the pressurized gas in the boost tank to the coal delivery pipe.

[0019] Furthermore, the nitrogen production equipment comprises:

[0020] A nitrogen generator, used to prepare nitrogen;

[0021] An air pressure detection device is arranged in the circulating air pipe, and is used to detect the air pressure value in the circulating air pipe;

[0022] A control unit is electrically connected to the nitrogen generator and the air pressure detection device respectively, and the control unit is used to control the nitrogen production amount of the nitrogen generator according to the air pressure value in the circulating air pipe.

[0023] Furthermore, the control unit comprises:

[0024] A collection module, electrically connected to the air pressure detection device, the collection module is used to obtain the air pressure value detected by the air pressure detection device and transmit the air pressure value to the processing module;

[0025] A processing module, connected to the acquisition module, and used for setting a working instruction of the nitrogen generating equipment according to the air pressure value;

[0026] A control module is connected to the processing module and electrically connected to the nitrogen generator, and the control module is used to control the operation of the nitrogen generator according to the working instruction.

[0027] Furthermore, the acquisition module is used to acquire the air pressure value ΔG in the circulating air pipe, and the control module is used to control the nitrogen generator;

[0028] The processing module is used to set a preset value G0 of the standard air pressure value, and the processing module is also used to set a difference g1 of the first preset air pressure value, a difference g2 of the second preset air pressure value, a difference g3 of the third preset air pressure value, and a difference g4 of the fourth preset air pressure value, and g1<g2<g3<g4; the processing module is also used to set a first preset nitrogen production amount A1, a second preset nitrogen production amount A2, a third preset nitrogen production amount A3, and a fourth preset nitrogen production amount A4, A1<A2<A3<A4;

[0029] According to the difference between the collected air pressure value △G of the cabin and the preset value G0 of the set standard air pressure value, a preset nitrogen production amount Ai is selected as the working condition of the nitrogen generator, wherein i=1, 2, 3, 4;

[0030] When ΔG-G0≤g1, the first preset nitrogen production amount A1 is selected as the nitrogen production amount of the nitrogen generator;

[0031] When g1<△G-G0≤g2, the second preset nitrogen production amount A2 is selected as the nitrogen production amount of the nitrogen generator;

[0032] When g2<△G-G0≤g3, the third preset nitrogen production amount A3 is selected as the nitrogen production amount of the nitrogen generator;

[0033] When g3<ΔG-G0≤g4, the fourth preset nitrogen production amount A4 is selected as the nitrogen production amount of the nitrogen generator.

[0034] Compared with the prior art, the safe preparation system for high-volatile coal in the embodiment of the present invention has the following beneficial effects:

[0035] In each link of coal powder preparation, the present invention performs nitrogen mist filling at all key locations where coal powder circulates, so that nitrogen is fully mixed with coal powder, thereby achieving the purpose of isolating oxygen, greatly reducing the possibility of coal powder explosion in the system, and greatly improving cost reduction. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a connection diagram of a high-volatile coal safety preparation system according to an embodiment of the present invention;

[0037] Figure 2 Schematic diagram of the composition of a system for safely preparing high-volatile coal in an embodiment of the present invention;

[0038] Figure 3 It is a schematic diagram of the composition of the nitrogen-generating equipment of the high-volatile coal safety preparation system in an embodiment of the present invention;

[0039] Figure 4 Schematic diagram of the composition of a control unit of a high-volatile coal safety preparation system according to an embodiment of the present invention;

[0040] In the figure, 1. coal mill; 2. powder collector; 3. coal powder bin; 4. coal conveying pipe; 5. nitrogen making equipment; 6. induced draft fan; 7. heating furnace; 8. first circulation air pipe; 9. second circulation air pipe; 10. third circulation air pipe; 11. fourth circulation air pipe; 12. exhaust fan; 13. booster tank; 14. pressure relief pipe. DETAILED DESCRIPTION

[0041] The specific implementation methods of the present application are further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0042] In the description of the present application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred unit or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0043] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0044] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0045] like Figure 1As shown, in an embodiment of the present application, a safe preparation system for high-volatile coal is provided, including: a coal mill; a powder collector; a coal powder bin; a coal conveying pipe, which is respectively arranged between the coal mill and the powder collector, and between the powder collector and the coal powder bin; a nitrogen making device, which is respectively connected to the coal mill, the powder collector, and the coal powder bin, and the nitrogen making device is used to prepare nitrogen and inject nitrogen into the coal mill, the powder collector and the coal powder bin; an induced draft unit, which is connected to the air inlet of the coal mill, and the induced draft unit is used to introduce the exhaust gas of the hot blast furnace into the system after the system is shut down; and a circulation pipe unit, which is used to circulate and transport nitrogen and the exhaust gas of the hot blast furnace.

[0046] Furthermore, in each link of coal powder preparation, the present invention performs nitrogen mist filling at all key locations where coal powder circulates, so that the nitrogen is fully mixed with the coal powder, thereby achieving the purpose of isolating oxygen, and making the system greatly reduce the possibility of coal powder explosion. After the pulverizing stops, the self-circulating mixed gas is used for cooling, which greatly improves the cost reduction.

[0047] In an embodiment of the present application, a safe preparation system for high-volatile coal is provided, wherein the induced draft unit comprises: an induced draft fan for introducing exhaust gas from a hot blast furnace into the circulating air duct; and a heating furnace connected to the induced draft fan, wherein the heating furnace is used to heat the exhaust gas.

[0048] In an embodiment of the present application, a safe preparation system for high-volatile coal is provided, and the circulation pipe unit includes: a first circulation air pipe connected between the nitrogen making equipment and the coal mill, the first circulation air pipe being used to transport the prepared nitrogen into the coal mill; a second circulation air pipe connected between the nitrogen making equipment and the powder collector, the second circulation air pipe being used to transport the prepared nitrogen into the powder collector; a third circulation air pipe connected between the nitrogen making equipment and the coal powder bin, the first circulation air pipe being used to transport the prepared nitrogen into the coal powder bin; a fourth circulation air pipe connected between the coal mill and the powder collector, the first circulation air pipe being used to transport the nitrogen in the powder collector and the exhaust gas of the hot blast furnace back to the coal mill.

[0049] In an embodiment of the present application, a high-volatile coal safety preparation system is provided, and an exhaust fan is provided on the fourth circulating air pipe, and the exhaust fan is used to suck out the gas in the powder collector to circulate the gas in the system.

[0050] In an embodiment of the present application, a safe preparation system for high-volatile coal is provided, wherein a booster tank is provided on the coal powder bin, and the booster tank is used to increase the air pressure to discharge the coal powder in the coal powder bin; a pressure relief pipe is provided between the booster tank and the coal delivery pipe, and the pressure relief pipe is used to transport the pressurized gas in the booster tank to the coal delivery pipe.

[0051] In an embodiment of the present application, a safe preparation system for high-volatile coal is provided, and the nitrogen making equipment includes: a nitrogen generator for preparing nitrogen; an air pressure detection device, which is arranged in the circulating air pipe, and the air pressure detection device is used to detect the air pressure value in the circulating air pipe; a control unit, which is electrically connected to the nitrogen generator and the air pressure detection device, respectively, and the control unit is used to control the nitrogen production amount of the nitrogen generator according to the air pressure value in the circulating air pipe.

[0052] In an embodiment of the present application, a safe preparation system for high-volatile coal is provided, and the control unit includes: an acquisition module, electrically connected to the air pressure detection device, the acquisition module is used to obtain the air pressure value detected by the air pressure detection device, and transmit the air pressure value to the processing module; a processing module, connected to the acquisition module, the processing module is used to set the working instructions of the nitrogen making equipment according to the air pressure value; a control module, connected to the processing module and electrically connected to the nitrogen maker, the control module is used to control the operation of the nitrogen maker according to the working instructions.

[0053] In an embodiment of the present application, a high-volatile coal safety preparation system is provided, wherein the acquisition module is used to collect the gas pressure value ΔG in the circulating gas pipe, and the control module is used to control the nitrogen generator;

[0054] The processing module is used to set a preset value G0 of the standard air pressure value, and the processing module is also used to set a difference g1 of the first preset air pressure value, a difference g2 of the second preset air pressure value, a difference g3 of the third preset air pressure value, and a difference g4 of the fourth preset air pressure value, and g1<g2<g3<g4; the processing module is also used to set a first preset nitrogen production amount A1, a second preset nitrogen production amount A2, a third preset nitrogen production amount A3, and a fourth preset nitrogen production amount A4, A1<A2<A3<A4;

[0055] According to the difference between the collected air pressure value △G of the cabin and the preset value G0 of the set standard air pressure value, a preset nitrogen production amount Ai is selected as the working condition of the nitrogen generator, wherein i=1, 2, 3, 4;

[0056] When ΔG-G0≤g1, the first preset nitrogen production amount A1 is selected as the nitrogen production amount of the nitrogen generator;

[0057] When g1<△G-G0≤g2, the second preset nitrogen production amount A2 is selected as the nitrogen production amount of the nitrogen generator;

[0058] When g2<△G-G0≤g3, the third preset nitrogen production amount A3 is selected as the nitrogen production amount of the nitrogen generator;

[0059] When g3<ΔG-G0≤g4, the fourth preset nitrogen production amount A4 is selected as the nitrogen production amount of the nitrogen generator.

[0060] In summary, the embodiment of the present invention provides a high-volatile coal safety preparation system, which includes: a coal mill; a powder collector; a coal powder bin; a coal conveying pipe, which is respectively arranged between the coal mill and the powder collector, and between the powder collector and the coal powder bin; a nitrogen making device, which is respectively connected to the coal mill, the powder collector, and the coal powder bin, and the nitrogen making device is used to prepare nitrogen and inject nitrogen into the coal mill, the powder collector, and the coal powder bin; an induced draft unit, which is connected to the air inlet of the coal mill, and the induced draft unit is used to introduce the exhaust gas of the hot blast furnace into the system after the system is shut down; a circulation pipe unit, which is used to circulate and transport nitrogen and the exhaust gas of the hot blast furnace. In each link of the coal powder preparation, the present invention performs atomized nitrogen filling on all key parts of the coal powder circulation, so that the nitrogen is fully mixed with the coal powder, thereby achieving the purpose of isolating oxygen, so that the system greatly reduces the possibility of coal powder explosion, and has a very great improvement in cost reduction.

[0061] Finally, it should be noted that it is obvious that those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

[0062] The above is only an example of implementation of the present invention, but it cannot be used to limit the scope of the present invention. Any structural changes made according to the present invention, as long as they do not lose the essence of the present invention, should be regarded as falling within the scope of protection of the present invention and being restricted. Those skilled in the art can clearly understand that for the convenience and simplicity of description, the specific working process and related instructions of the system described above can refer to the corresponding process in the aforementioned method embodiment, and will not be repeated here.

[0063] The term "comprise" or any other similar term is intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus / unit that includes a list of elements includes not only those elements but also other elements not explicitly listed, or also includes elements inherent to such process, method, article, or apparatus / unit.

[0064] So far, the technical solutions of the present invention have been described in conjunction with the further embodiments shown in the accompanying drawings, but it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

[0065] The above description is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention.

Claims

1. A high-volatile coal safety preparation system, characterized in that: include: Coal mill; Powder collector; Pulverized coal silo; Coal conveying pipes are respectively arranged between the coal mill and the powder collector, and between the powder collector and the coal powder bin; A nitrogen generator is connected to the coal mill, the coal powder collector and the coal powder bin, respectively, and is used to prepare nitrogen and inject nitrogen into the coal mill, the coal powder collector and the coal powder bin; An induced draft unit connected to the air inlet of the coal mill, the induced draft unit being used to introduce the exhaust gas of the hot blast furnace into the system after the system is shut down; Circulation pipe unit, used for circulating nitrogen and waste gas from hot blast furnace; The circulation pipe unit comprises: a first circulating gas pipe connected between the nitrogen generating equipment and the coal mill, the first circulating gas pipe being used to transport the prepared nitrogen to the coal mill; A second circulating air pipe is connected between the nitrogen generating device and the powder collector, and the second circulating air pipe is used to transport the prepared nitrogen to the powder collector; a third circulating gas pipe, connected between the nitrogen generating equipment and the pulverized coal bin, the third circulating gas pipe being used to transport the prepared nitrogen into the pulverized coal bin; a fourth circulating air pipe connected between the coal mill and the powder collector, and used for conveying the nitrogen in the powder collector and the exhaust gas of the hot blast furnace back to the coal mill; The pulverized coal bin is provided with a pressure boosting tank, which is used to increase the air pressure to discharge the pulverized coal in the pulverized coal bin; A pressure relief pipe is provided between the boost tank and the coal delivery pipe, and the pressure relief pipe is used to transport the pressurized gas in the boost tank to the coal delivery pipe; The nitrogen production equipment comprises: A nitrogen generator, used to prepare nitrogen; An air pressure detection device is arranged in the circulating air pipe, and is used to detect the air pressure value in the circulating pipe unit; A control unit is electrically connected to the nitrogen generator and the air pressure detection device respectively, and the control unit is used to control the nitrogen production amount of the nitrogen generator according to the air pressure value in the circulating air pipe.

2. A high-volatile coal safety preparation system according to claim 1, characterized in that: The air induction unit comprises: An induced draft fan, used to introduce exhaust gas from the hot blast furnace into the circulation pipe unit; A heating furnace is connected to the induced draft fan, and the heating furnace is used to heat the exhaust gas.

3. A high-volatile coal safety preparation system according to claim 1, characterized in that: The fourth circulating air pipe is provided with an exhaust fan, and the exhaust fan is used to suck out the gas in the powder collector so as to circulate the gas in the system.

4. A high-volatile coal safety preparation system according to claim 1, characterized in that: The control unit comprises: A collection module, electrically connected to the air pressure detection device, the collection module is used to obtain the air pressure value detected by the air pressure detection device and transmit the air pressure value to the processing module; A processing module, connected to the acquisition module, and used for setting a working instruction of the nitrogen generating equipment according to the air pressure value; A control module is connected to the processing module and electrically connected to the nitrogen generator, and the control module is used to control the operation of the nitrogen generator according to the working instruction.

Images