CN115305125A - Full negative pressure coal powder preparation system and method capable of self-circulating flue gas - Google Patents
Full negative pressure coal powder preparation system and method capable of self-circulating flue gas Download PDFInfo
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- CN115305125A CN115305125A CN202211083540.1A CN202211083540A CN115305125A CN 115305125 A CN115305125 A CN 115305125A CN 202211083540 A CN202211083540 A CN 202211083540A CN 115305125 A CN115305125 A CN 115305125A
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
- B02C23/04—Safety devices
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2100/00—Handling of exhaust gases produced during the manufacture of iron or steel
- C21B2100/80—Interaction of exhaust gases produced during the manufacture of iron or steel with other processes
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Abstract
The invention belongs to the field of metallurgy and coal carbon, and relates to a system and a method for preparing full negative pressure coal powder capable of self-circulating flue gas, which comprises a raw coal bin communicated with a raw coal conveying belt, a coal feeder and a coal mill sequentially communicated with the raw coal bin, and a drying furnace and a cloth bag powder collecting device respectively communicated with the coal mill, wherein a blast furnace hot blast furnace waste gas pipeline is arranged on the drying furnace, and a waste gas stop valve, a waste gas fan inlet regulating valve, a waste gas induced draft fan and a waste gas fan outlet regulating valve are sequentially arranged on the blast furnace hot blast furnace waste gas pipeline; the cloth bag powder collecting device is communicated with a pulverized coal fan through a system air volume regulating valve, the other end of the pulverized coal fan is communicated with a blast furnace hot blast stove waste gas pipeline through a circulating waste gas stop valve, and a communication port is formed between a waste gas draught fan and a waste gas fan outlet regulating valve. The invention recycles the heat in the tail gas discharged by the coal powder preparation system and reduces the tail gas quantity discharged into the atmosphere by the coal powder preparation system.
Description
Technical Field
The invention belongs to the field of metallurgy and coal carbon, and relates to a system and a method for preparing full negative pressure coal powder capable of self-circulating flue gas.
Background
The existing nitrogen charging safety device of the powder preparation system is not completely arranged, and because the raw coal of most coal powder preparation systems is mixed with the bituminous coal with higher proportion, the bituminous coal has high volatile content and is easy to combust and explode, so that certain difficulty is brought to safe powder preparation. Most of the coal powder preparation systems rely on blast furnace hot blast stove waste gas, and once the blast furnace which provides the waste gas stops blowing and cannot provide the waste gas or the amount of the waste gas is greatly reduced, the system is forced to stop and cannot prepare the coal powder. The waste gas inspected by the coal powder preparation system is not recycled, so that the heat loss of the system and the air pollution are caused.
Disclosure of Invention
In view of the above, the present invention provides a system and a method for preparing pulverized coal under full negative pressure, which can self-circulate flue gas, to recycle heat in tail gas discharged from a pulverized coal preparation system, and reduce the amount of tail gas discharged to the atmosphere from the pulverized coal preparation system.
In order to achieve the purpose, the invention provides the following technical scheme: a full negative pressure coal powder preparation system capable of self-circulating flue gas comprises a raw coal bin communicated with a raw coal conveying belt, a coal feeder and a coal mill sequentially communicated with the raw coal bin, and a drying furnace and a cloth bag powder collecting device respectively communicated with the coal mill, wherein a blast furnace hot blast furnace waste gas pipeline is arranged on the drying furnace, and a waste gas stop valve, a waste gas fan inlet regulating valve, a waste gas draught fan and a waste gas fan outlet regulating valve are sequentially arranged on the blast furnace hot blast furnace waste gas pipeline; the cloth bag powder collecting device is communicated with a pulverized coal fan through a system air volume regulating valve, the other end of the pulverized coal fan is communicated with a blast furnace hot blast stove waste gas pipeline through a circulating waste gas stop valve, and a communication port is formed between a waste gas draught fan and a waste gas fan outlet regulating valve.
Optionally, the top of the drying furnace is connected with an ignition device, and the top of the drying furnace is sequentially provided with a coke oven gas pipeline, a blast furnace gas inner ring pipeline and a blast furnace gas outer ring pipeline from the ignition device to the bottom.
Optionally, a coke oven gas stop valve, a coke oven gas regulating valve and a coke-coal-assisted air-conditioning section valve are sequentially arranged on the coke oven gas pipeline along the coke oven gas inlet; the blast furnace gas inner ring pipeline is provided with a blast furnace gas inner ring stop valve, a blast furnace gas inner ring adjusting valve and a blast furnace gas inner ring auxiliary air-conditioning throttle valve in sequence along a blast furnace gas inlet; the blast furnace gas outer ring circuit is provided with a blast furnace gas outer ring stop valve, a blast furnace gas outer ring adjusting valve and a blast furnace gas outer ring auxiliary air-conditioning throttle valve in sequence along a blast furnace gas inlet; the coking coal auxiliary air-conditioning section valve, the high-coal inner ring auxiliary air-conditioning section valve and the high-coal outer ring auxiliary air-conditioning section valve are arranged in parallel and are connected with combustion-supporting fans.
Optionally, the drying furnace and the coal mill are sequentially communicated with the coal mill through a hot air valve, a cold air access port, a nitrogen access port, an oxygen content monitoring point and a temperature monitoring point, and a pressure gauge, a peephole and a blow-off valve are further arranged on the drying furnace; be provided with cold wind on the cold wind access mouth and insert the pipeline, have set gradually cold wind governing valve and cold wind stop valve along cold wind direction of admitting air on this pipeline, be provided with nitrogen gas on the nitrogen gas access mouth and insert the pipeline, be provided with the coal pulverizer entry on this pipeline and fill the nitrogen valve.
Optionally, a coal feeder inlet valve is arranged between the raw coal bunker and the coal feeder, a coal mill inlet valve is arranged between the coal feeder and the coal mill, and the coal feeder and the coal mill are communicated with a sealing fan; the coal mill is sequentially communicated with the cloth bag powder collecting device through the nitrogen inlet, the temperature monitoring point and the oxygen content monitoring point, the nitrogen inlet is provided with a nitrogen pipeline with a coal mill outlet nitrogen charging pump, and the coal mill is further provided with an ammeter.
Optionally, a pulse powder flushing device used by introducing nitrogen is arranged at the top of the cloth bag powder collecting device, and a coal powder bin is communicated with the coal powder vibrating screen through a discharging motor at the bottom in sequence; an oxygen content monitoring point and a temperature monitoring point are respectively arranged between the bag powder collecting device and the system air volume regulating valve, and a nitrogen charging valve for charging nitrogen is also arranged on the bag powder collecting device.
The method for preparing the full negative pressure coal powder capable of self-circulating flue gas is applied to the full negative pressure coal powder preparation system capable of self-circulating flue gas, and comprises the following steps of:
A. the preparation work before the powder making is carried out,
a1, starting a raw coal conveying belt, filling raw coal into a raw coal bin, and ensuring that raw coal enters a coal mill;
a2, igniting and preserving heat of the drying furnace to provide heat of the dried raw coal for the whole system;
a21, furnace purging: starting a combustion-supporting fan and a coking coal auxiliary air conditioning throttle valve, purging a drying furnace hearth by using combustion-supporting air, wherein the purging time of the hearth is not less than 3 minutes, and formally igniting after purging;
a22, ignition program: opening a coke oven gas regulating valve, opening a coke coal auxiliary air-conditioning throttle valve, and starting an ignition device; at the moment, the ignition device is pushed into the drying oven, and the coke oven gas stop valve is opened to supply coke oven gas for ignition;
and A23, confirming that the ignition is successful: observing the flame condition through a peephole on the drying furnace or a field remote in-furnace monitoring camera arranged on the drying furnace, wherein the occurrence of light blue flame indicates successful ignition;
a24, furnace body heat preservation: opening a blast furnace gas inner ring stop valve, a blast furnace gas inner ring adjusting valve and a blast furnace inner ring auxiliary air-conditioning valve to burn blast furnace gas for heat preservation of the drying furnace;
B. the coal dust preparation system is started up,
b1, opening a hot blast valve and closing a bleeding valve;
b2, a pulverized coal fan is started, the whole process of the pulverized coal preparation system is operated under full negative pressure, and the pulverized coal fan provides negative pressure for the whole system;
b3, opening a system air volume regulating valve;
b4, sequentially opening a waste gas induced draft fan, a waste gas stop valve, a waste gas fan inlet regulating valve and a waste gas fan outlet regulating valve, and introducing the waste gas of the blast furnace hot blast stove into the drying furnace to be mixed with the high-temperature gas in the drying furnace;
b5, opening a cold air stop valve, adjusting the temperature of the whole system by adjusting the opening of a cold air adjusting valve and the combustion amount of blast furnace gas, keeping the outlet temperature of the coal mill within 95 ℃, and gradually increasing the outlet temperature of the cloth bag powder collecting device;
b6, controlling the negative pressure of the whole system by adjusting the opening of the air volume adjusting valve of the system, and keeping the pressure of the hearth of the drying furnace at a micro negative pressure, so as to ensure that the system has certain suction force and the whole air path is smooth;
b7, starting the coal mill, the discharging motor, the coal powder vibrating screen and the pulse powder blowing device when the outlet temperature of the cloth bag powder collecting device reaches about 70 ℃;
b8, opening an inlet valve of the coal mill and an inlet valve of the coal feeder, starting the coal feeder and setting the coal feeding amount, wherein the initial set value of the coal feeding amount is not too large, judging that the coal mill bites coal by observing an ammeter of the coal mill when the current is obviously increased compared with that before coal feeding, closing a cold air stop valve and a cold air adjusting valve at the moment, and beginning to grind coal and prepare powder;
b9, gradually and slowly increasing the coal feeding amount of a coal feeder, gradually increasing the combustion amount of blast furnace gas, and keeping the outlet temperature of the coal mill at 85-93 ℃;
b10, determining that the temperature and the oxygen content of an inlet and an outlet of the coal mill are stable and within a specified range, and finishing the system starting; at the moment, the circulating waste gas stop valve can be opened to reintroduce the waste gas pumped by the pulverized coal fan into the drying furnace for preheating and recycling.
Optionally, in the step B3, in the initial stage, because coal is not formally ground, the whole coal pulverizing system has no load, and the initial opening is not too large, which is 30% -40%; and B5, controlling the gas combustion amount by controlling the opening degree of the blast furnace gas outer ring regulating valve and the opening degree of the blast furnace gas inner ring regulating valve.
Optionally, in the step B9, the blast furnace gas in the outer ring is opened when the blast furnace gas in the inner ring is not enough.
Optionally, in the starting process of the system, if the inlet and outlet temperature and the oxygen content of the coal mill and the outlet temperature and the oxygen content of the cloth bag powder collecting device exceed the standards, a nitrogen filling valve arranged at the corresponding position is immediately opened to fill nitrogen for cooling or reduce the oxygen content, so that the safety of the system is ensured.
The invention has the beneficial effects that: the invention is operated in a totally-enclosed and totally-negative pressure mode, air is effectively isolated in the powder preparation process, nitrogen charging safety devices are arranged at multiple positions of the system, and raw coal can be safely, quickly and efficiently processed into coal powder with qualified quality (moisture, granularity and the like). The dependence of a pulverized coal preparation system on the waste gas of the blast furnace hot blast stove is reduced, and the dilemma that the hot blast stove cannot provide the waste gas or cannot prepare the powder when the amount of the waste gas is greatly reduced when the blast furnace stops blowing is avoided. Meanwhile, the heat in the tail gas discharged by the coal powder preparation system is recycled, so that the heat loss is reduced, the consumption of blast furnace gas is reduced, and the energy is saved. And effectively reduce the tail gas amount discharged into the atmosphere by a coal powder preparation system and reduce the pollution to the environment.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and combinations particularly pointed out hereinafter.
Drawings
For the purposes of promoting a better understanding of the objects, aspects and advantages of the invention, reference will now be made to the following detailed description taken in conjunction with the accompanying drawings in which:
FIG. 1 is a schematic diagram of the overall system of the present invention.
Reference numerals are as follows: the system comprises a raw coal conveying belt 1, a raw coal bin 2, a coal feeder inlet valve 3, a coal feeder 4, a coal mill inlet valve 5, a sealing fan 6, a coal mill 7, an ammeter 8, a coal mill outlet nitrogen charging valve 9, a cloth bag powder collecting device 10, a pulse powder blowing device 11, a nitrogen charging valve 12, a discharging motor 13, a coal powder vibrating screen 14, a coal powder bin 15, a system air volume adjusting valve 16, a coal powder fan 17, a circulating waste gas stop valve 18, a waste gas stop valve 19, a waste gas fan inlet adjusting valve 20, a waste gas induced draft fan 21, a waste gas fan outlet adjusting valve 22, a drying furnace 23, a pressure gauge 24, a peephole 25, a combustion-supporting fan 26, an ignition device 27, a blast furnace gas auxiliary air conditioning throttle valve 28, a blast furnace inner ring auxiliary air conditioning throttle valve 29, a coke furnace gas auxiliary air conditioning throttle valve 30, a coke furnace gas stop valve 31, a coke furnace gas adjusting valve 32, a blast furnace gas inner ring stop valve 33, a blast furnace gas inner ring adjusting valve 34, a blast furnace gas stop valve 35, a blast furnace gas outer ring stop valve 36, a blast furnace gas adjusting valve 37, a blow-off valve 38, a coal inlet nitrogen valve 39, a coal mill inlet nitrogen charging valve 40, a temperature adjusting valve 41, a cold air cooling air monitoring point 43, and a cold air monitoring point 42.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention in a schematic way, and the features in the following embodiments and examples may be combined with each other without conflict.
Wherein the showings are for the purpose of illustrating the invention only and not for the purpose of limiting the same, and in which there is shown by way of illustration only and not in the drawings in which there is no intention to limit the invention thereto; to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "rear", etc., based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of description, but it is not an indication or suggestion that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes, and are not to be construed as limiting the present invention, and the specific meaning of the terms may be understood by those skilled in the art according to specific situations.
Referring to fig. 1, a system for preparing full negative pressure pulverized coal capable of self-circulating flue gas includes a raw coal bunker 2 communicated with a raw coal transportation belt 1, a coal feeder 4 and a coal mill 7 sequentially communicated with the raw coal bunker 2, and a drying furnace 23 and a cloth bag dust collecting device 10 respectively communicated with the coal mill 7, wherein a blast furnace hot blast furnace waste gas pipeline is arranged on the drying furnace 23, and a waste gas stop valve 19, a waste gas fan inlet regulating valve 20, a waste gas draught fan 21 and a waste gas fan outlet regulating valve 22 are sequentially arranged on the blast furnace hot blast furnace waste gas pipeline; the cloth bag powder collecting device 10 is communicated with a coal powder fan 17 through a system air volume regulating valve 16, the other end of the coal powder fan 17 is communicated with a blast furnace hot blast stove waste gas pipeline through a circulating waste gas stop valve 18, a communication port is arranged between a waste gas draught fan 21 and a waste gas fan outlet regulating valve 22, the top of a drying furnace 23 is connected with an ignition device 27, a coke oven gas pipeline is sequentially arranged at the top of the drying furnace 23 from bottom to top along the ignition device 27, a blast furnace gas inner ring pipeline and a blast furnace gas outer ring pipeline are sequentially arranged on the coke oven gas pipeline, and a coke oven gas stop valve 31, a coke oven gas regulating valve 32 and a coke oven gas auxiliary air conditioning throttle valve 30 are sequentially arranged on the coke oven gas pipeline along a coke oven gas inlet; the blast furnace gas inner ring pipeline is provided with a blast furnace gas inner ring stop valve 33, a blast furnace gas inner ring adjusting valve 34 and a blast furnace gas inner ring auxiliary air-conditioning throttle valve 29 along the blast furnace gas inlet in sequence; the blast furnace gas outer ring circuit is provided with a blast furnace gas outer ring stop valve 35, a blast furnace gas outer ring adjusting valve 36 and a blast furnace gas outer ring auxiliary air-conditioning throttle valve 28 in sequence along the blast furnace gas inlet; the coking coal auxiliary air-conditioning valve 30, the high-coal inner ring auxiliary air-conditioning valve 29 and the high-coal outer ring auxiliary air-conditioning valve 28 are arranged in parallel and are connected with combustion-supporting fans 26, the drying furnace 23 and the coal mill 7 are communicated with the coal mill 7 through a hot blast valve 38, a cold blast inlet, a nitrogen inlet, an oxygen content monitoring point 43 and a temperature monitoring point 42 in sequence, and the drying furnace 23 is also provided with a pressure gauge 24, a peephole 25 and a blow-off valve 37; a cold air inlet pipeline is arranged on the cold air inlet, a cold air regulating valve 41 and a cold air stop valve 40 are sequentially arranged on the pipeline along the cold air inlet direction, a nitrogen inlet pipeline is arranged on the nitrogen inlet, a coal mill inlet nitrogen charging valve 39 is arranged on the pipeline, a coal feeder inlet valve 3 is arranged between the raw coal bunker 2 and the coal feeder 4, a coal mill inlet valve 5 is arranged between the coal feeder 4 and the coal mill 7, and a sealing fan 6 is jointly communicated with the coal feeder 4 and the coal mill 7; the coal mill 7 is communicated with the cloth bag powder collecting device 10 sequentially through a nitrogen inlet, a temperature monitoring point 42 and an oxygen content monitoring point 43, the nitrogen inlet is provided with a nitrogen pipeline with a nitrogen pump 9 at the outlet of the coal mill, the coal mill 7 is also provided with an ammeter 8, the top of the cloth bag powder collecting device 10 is provided with a pulse powder flushing device 11 used for introducing nitrogen, and the bottom of the cloth bag powder collecting device is communicated with a pulverized coal vibrating screen 14 sequentially through a discharging motor 13 to form a pulverized coal bin 15; an oxygen content monitoring point 43 and a temperature monitoring point 42 are respectively arranged between the bag powder collecting device 10 and the system air volume regulating valve 16, and a nitrogen charging valve 12 for charging nitrogen is also arranged on the bag powder collecting device 10.
The method for preparing the full negative pressure coal powder capable of self-circulating flue gas is applied to the full negative pressure coal powder preparation system capable of self-circulating flue gas, and comprises the following steps of:
1. a coal powder preparation system starting step and a related process flow;
(1) The raw coal conveyor belt 1 is started to fill the raw coal bin 2 with raw coal (to ensure that the raw coal in the coal mill 7 continuously enters).
(2) Ignition and heat preservation process of the drying furnace 23 (providing heat of the dried raw coal for the whole system):
(1) purging a hearth: and (3) starting the combustion-supporting fan 26 and the coking coal auxiliary air conditioning throttle valve 30, blowing the hearth of the drying furnace 23 by using combustion-supporting air, wherein the hearth blowing time is not less than 3 minutes (the blasting accident caused by the existence of coal gas dead angles in the drying furnace 23 is prevented), and finally, igniting after blowing.
(2) And (3) ignition program: the coke oven gas regulating valve 32 is opened, the coke coal auxiliary air conditioning throttle valve 30 is opened, and the ignition device 27 is started. At this time, the ignition device 27 is pushed into the drying oven 23, and the coke oven gas stop valve 31 is opened to supply coke oven gas to start ignition.
(3) And (3) confirming that the ignition is successful: flame conditions are observed through a peephole 25 on the drying furnace 23 or a field remote in-furnace monitoring camera, and light blue flame appears to indicate successful ignition.
(4) Furnace body heat preservation: and opening the blast furnace gas inner ring stop valve 33, the blast furnace gas inner ring adjusting valve 34 and the blast furnace gas inner ring auxiliary air-conditioning throttle valve 29 to burn the blast furnace gas for heat preservation of the drying furnace 23.
2. A coal powder preparation system starting step and a related process flow;
(1) The hot blast valve 38 is opened and the bleed valve 37 is closed.
(2) And (4) starting a pulverized coal fan 17 (the whole process of the pulverized coal preparation system is in full negative pressure operation, and the pulverized coal fan 17 provides negative pressure for the whole system).
(3) The system is opened, an air quantity regulating valve 16 is opened (the whole coal pulverizing system has no load because coal is not formally ground in the initial starting stage, the initial opening degree is not too large, and is preferably 30 to 40 percent)
(4) And opening a waste gas draught fan 21, a waste gas stop valve 19, a waste gas fan inlet regulating valve 20 and a waste gas fan outlet regulating valve 22 in sequence, and introducing the waste gas of the blast furnace hot blast stove into the drying furnace 23 to be mixed with the high-temperature gas in the drying furnace 23.
(5) And opening the cold air stop valve 40, regulating the temperature of the whole system by regulating the opening degree of the cold air regulating valve 41 and the combustion amount of the blast furnace gas (controlling the combustion amount of the gas by controlling the opening degrees of the blast furnace gas outer ring regulating valve 36 and the blast furnace gas inner ring regulating valve 34), keeping the outlet temperature of the coal mill 7 within 95 ℃, and gradually increasing the outlet temperature of the cloth bag powder collecting device 10.
(6) Through 16 apertures of the air volume adjusting valve of the adjusting system, the negative pressure of the whole system is well controlled (by observing a pressure gauge 24 on the drying furnace 23), the pressure of a hearth of the drying furnace 23 is kept to be micro negative pressure (about-200 pa), a certain drawing force of the system is ensured, and the whole air path is smooth.
(7) And when the temperature of the outlet of the cloth bag powder collecting device 10 reaches about 70 ℃, starting the coal mill 7, the discharging motor 13, the coal powder vibrating screen 14 and the pulse powder blowing device 11.
(8) Opening an inlet valve 5 of the coal mill, an inlet valve 3 of the coal mill, starting the coal feeder 4 and setting the coal feeding amount, wherein the initial set value of the coal feeding amount is not too large (about 10 t/h), observing an ammeter 8 of the coal mill 7, judging that the coal mill 7 bites when the current is obviously increased compared with that before coal feeding, closing a cold air stop valve 40 and a cold air adjusting valve 41 (preventing air from entering a system to be contacted with raw coal in the coal mill 7), and beginning to grind coal and prepare powder.
(9) Gradually and slowly increasing the coal feeding amount of the coal feeder 4, gradually increasing the combustion amount of the blast furnace gas (the blast furnace gas of the outer ring is opened when the blast furnace gas of the inner ring is insufficient), and keeping the outlet temperature of the coal mill 7 at 85-93 ℃.
(10) And when the inlet and outlet temperature and the oxygen content of the coal mill 7 are determined to be stable and in the specified range, the system is started. At this time, the circulating waste gas stop valve 1918 can be opened to reintroduce the waste gas extracted by the pulverized coal fan 17 into the drying furnace 23 for preheating and recycling.
(11) In the starting process of the system, if the temperature and the oxygen content of the inlet and the outlet of the coal mill 7 and the temperature and the oxygen content of the outlet of the cloth bag powder collecting device 10 exceed the standards, a nitrogen filling valve arranged at the corresponding position is immediately opened to fill nitrogen for cooling or reducing the oxygen content, so that the safety of the system is ensured.
The invention is operated in a fully-closed and full-negative pressure way, effectively isolates air in the process of pulverizing, and nitrogen-charging safety devices are arranged at multiple positions of the system, so that raw coal can be safely, quickly and efficiently processed into coal powder with qualified quality (moisture, granularity and the like). The method reduces the dependence of a coal powder preparation system on the waste gas of the blast furnace hot blast stove, and avoids the dilemma that the hot blast stove cannot provide the waste gas or cannot prepare the powder when the amount of the waste gas is greatly reduced when the blast furnace stops blowing. Meanwhile, the heat in the tail gas discharged by the coal powder preparation system is recycled, so that the heat loss is reduced, the consumption of blast furnace gas is reduced, and the energy is saved. And effectively reduce the tail gas amount discharged into the atmosphere by a coal powder preparation system and reduce the pollution to the environment.
Finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the claims of the present invention.
Claims (10)
1. The utility model provides a but full negative pressure buggy preparation system of self-loopa flue gas which characterized in that: the system comprises a raw coal bin communicated with a raw coal conveying belt, a coal feeder and a coal mill sequentially communicated with the raw coal bin, and a drying furnace and a cloth bag powder collecting device respectively communicated with the coal mill, wherein a blast furnace hot blast furnace waste gas pipeline is arranged on the drying furnace, and a waste gas stop valve, a waste gas fan inlet regulating valve, a waste gas draught fan and a waste gas fan outlet regulating valve are sequentially arranged on the blast furnace hot blast furnace waste gas pipeline;
the cloth bag powder collecting device is communicated with a pulverized coal fan through a system air volume regulating valve, the other end of the pulverized coal fan is communicated with a blast furnace hot blast stove waste gas pipeline through a circulating waste gas stop valve, and a communication port is formed between a waste gas draught fan and a waste gas fan outlet regulating valve.
2. The system for preparing pulverized coal under full negative pressure capable of self-circulating flue gas according to claim 1, characterized in that: the top of the drying furnace is connected with an ignition device, and the top of the drying furnace is sequentially provided with a coke oven gas pipeline, a blast furnace gas inner ring pipeline and a blast furnace gas outer ring pipeline from the ignition device to the bottom.
3. The system for preparing pulverized coal under full negative pressure capable of self-circulating flue gas according to claim 2, characterized in that: a coke oven gas stop valve, a coke oven gas regulating valve and a coke-coal-assisted air-conditioning section valve are sequentially arranged on the coke oven gas pipeline along the coke oven gas inlet; the blast furnace gas inner ring pipeline is provided with a blast furnace gas inner ring stop valve, a blast furnace gas inner ring adjusting valve and a blast furnace gas inner ring auxiliary air-conditioning throttle valve in sequence along a blast furnace gas inlet; the blast furnace gas outer ring circuit is provided with a blast furnace gas outer ring stop valve, a blast furnace gas outer ring adjusting valve and a blast furnace gas outer ring auxiliary air-conditioning throttle valve in sequence along a blast furnace gas inlet;
the coking coal auxiliary air-conditioning section valve, the high coal inner ring auxiliary air-conditioning section valve and the high coal outer ring auxiliary air-conditioning section valve are arranged in parallel and are connected with combustion-supporting fans.
4. The system for preparing pulverized coal under full negative pressure capable of self-circulating flue gas according to claim 1, characterized in that: the drying furnace and the coal mill are communicated with the coal mill sequentially through a hot blast valve, a cold blast access port, a nitrogen access port, an oxygen content monitoring point and a temperature monitoring point, and a pressure gauge, a peephole and a blow-off valve are further arranged on the drying furnace;
be provided with cold wind on the cold wind access mouth and insert the pipeline, have set gradually cold wind governing valve and cold wind stop valve along cold wind direction of admitting air on this pipeline, be provided with nitrogen gas on the nitrogen gas access mouth and insert the pipeline, be provided with the coal pulverizer entry on this pipeline and fill the nitrogen valve.
5. The system for preparing pulverized coal under full negative pressure capable of self-circulating flue gas according to claim 1, characterized in that: a coal feeder inlet valve is arranged between the raw coal bin and the coal feeder, a coal mill inlet valve is arranged between the coal feeder and the coal mill, and the coal feeder and the coal mill are communicated with a sealing fan together;
the coal mill is sequentially communicated with the cloth bag powder collecting device through the nitrogen inlet, the temperature monitoring point and the oxygen content monitoring point, the nitrogen inlet is provided with a nitrogen pipeline with a coal mill outlet nitrogen charging pump, and the coal mill is further provided with an ammeter.
6. The system for preparing pulverized coal under full negative pressure capable of self-circulating flue gas according to claim 1, characterized in that: the top of the cloth bag powder collecting device is provided with a pulse powder flushing device used by introducing nitrogen, and the bottom of the cloth bag powder collecting device is communicated with a coal powder bin through a discharging motor and a coal powder vibrating screen in sequence;
an oxygen content monitoring point and a temperature monitoring point are respectively arranged between the bag powder collecting device and the system air volume regulating valve, and a nitrogen charging valve for charging nitrogen is also arranged on the bag powder collecting device.
7. A method for preparing full negative pressure coal dust capable of self-circulating flue gas, which applies the full negative pressure coal dust preparation system capable of self-circulating flue gas as claimed in any one of claims 1 to 6, and is characterized by comprising the following steps:
A. the preparation work before the powder making is carried out,
a1, starting a raw coal conveying belt, filling raw coal into a raw coal bin, and ensuring that raw coal enters a coal mill;
a2, igniting and preserving heat of the drying furnace to provide heat of the dried raw coal for the whole system;
a21, furnace purging: starting a combustion-supporting fan and a coking coal-supporting air-conditioning throttle valve, blowing the drying furnace hearth by using combustion-supporting air, wherein the blowing time of the hearth is not less than 3 minutes, and formally igniting after blowing;
a22, ignition program: opening a coke oven gas regulating valve, opening a coke coal auxiliary air-conditioning throttle valve, and starting an ignition device; at the moment, the ignition device is pushed into the drying furnace, and the coke oven gas stop valve is opened to supply coke oven gas for ignition;
and A23, confirming that the ignition is successful: observing the flame condition through a peephole on the drying furnace or a field remote in-furnace monitoring camera arranged on the drying furnace, wherein the occurrence of light blue flame indicates successful ignition;
a24, furnace body heat preservation: opening a blast furnace gas inner ring stop valve, a blast furnace gas inner ring adjusting valve and a blast furnace inner ring auxiliary air-conditioning valve to burn blast furnace gas for heat preservation of the drying furnace;
B. the coal dust preparation system is started up,
b1, opening a hot blast valve and closing a bleeding valve;
b2, a pulverized coal fan is started, the whole process of the pulverized coal preparation system is operated under full negative pressure, and the pulverized coal fan provides negative pressure for the whole system;
b3, opening a system air volume regulating valve;
b4, sequentially opening a waste gas draught fan, a waste gas stop valve, a waste gas fan inlet regulating valve and a waste gas fan outlet regulating valve, and introducing the waste gas of the blast furnace hot blast stove into the drying furnace to be mixed with the high-temperature gas in the drying furnace;
b5, opening a cold air stop valve, adjusting the temperature of the whole system by adjusting the opening of a cold air adjusting valve and the combustion amount of blast furnace gas, keeping the outlet temperature of the coal mill within 95 ℃, and gradually increasing the outlet temperature of the cloth bag powder collecting device;
b6, controlling the negative pressure of the whole system by adjusting the opening of the air volume adjusting valve of the system, and keeping the pressure of the hearth of the drying furnace at a micro negative pressure, so as to ensure that the system has certain suction force and the whole air path is smooth;
b7, starting the coal mill, the discharging motor, the coal powder vibrating screen and the pulse powder blowing device when the outlet temperature of the cloth bag powder collecting device reaches about 70 ℃;
b8, opening an inlet valve of the coal mill and an inlet valve of the coal feeder, starting the coal feeder and setting the coal feeding amount, wherein the initial set value of the coal feeding amount is not too large, judging that the coal mill bites coal by observing an ammeter of the coal mill when the current is obviously increased compared with that before coal feeding, closing a cold air stop valve and a cold air adjusting valve at the moment, and beginning to carry out formal coal grinding and powder preparation;
b9, gradually and slowly increasing the coal feeding amount of a coal feeder, gradually increasing the combustion amount of blast furnace gas, and keeping the outlet temperature of a coal mill at 85-93 ℃;
b10, determining that the temperature and the oxygen content of an inlet and an outlet of the coal mill are stable and within a specified range, and finishing the system start; at the moment, the circulating waste gas stop valve can be opened to reintroduce the waste gas pumped by the pulverized coal fan into the drying furnace for preheating and recycling.
8. The method for preparing the full negative pressure pulverized coal capable of self-circulating flue gas according to claim 7, characterized in that: in the step B3, in the initial stage, because coal is not formally ground, the whole coal pulverizing system has no load, and the initial opening is not suitable to be too large and is 30-40%; and B5, controlling the gas combustion amount by controlling the opening degree of the blast furnace gas outer ring regulating valve and the opening degree of the blast furnace gas inner ring regulating valve.
9. The method for preparing the full negative pressure pulverized coal capable of self-circulating flue gas according to claim 7, characterized in that: and B9, opening the outer ring blast furnace gas when the inner ring blast furnace gas is insufficient.
10. The method for preparing the full negative pressure pulverized coal capable of self-circulating flue gas according to claim 7, characterized in that: in the starting process of the system, if the temperature and the oxygen content of an inlet and an outlet of a coal mill and the temperature and the oxygen content of an outlet of a cloth bag powder collecting device exceed the standards, a nitrogen filling valve arranged at the corresponding position is immediately opened to fill nitrogen for cooling or reducing the oxygen content, so that the safety of the system is ensured.
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