CN212915933U - Novel coal mill device for taking air from kiln tail - Google Patents

Abstract

The utility model discloses a novel coal mill device for taking air from the kiln tail, which comprises an air swept coal mill, a powder concentrator, a cyclone dust collector and a coal dust bin, wherein one of the interfaces of a first tee joint is connected with the air inlet of the air swept coal mill, one of the other two interfaces of the first tee joint is connected with a kiln tail waste gas conveying pipeline, the other one of the other two interfaces of the first tee joint is connected with one end of a circulating air pipe, and a first electric louver valve is fixed on the kiln tail waste gas conveying pipeline; similarly, an air outlet of the cyclone dust collector is connected with one interface of a second tee joint through a pipeline, one of the other two interfaces of the second tee joint is connected and communicated with the other end of the circulating air pipe, and the other one of the other two interfaces of the second tee joint is connected and communicated with an exhaust gas discharge pipe; therefore, waste gas discharged from the cyclone dust collector for preparing the pulverized coal is circularly introduced into the air swept coal mill, cold air is not used, the waste gas discharge amount in unit time can be effectively reduced, and the oxygen content in the pulverized coal preparation process is also reduced.

Description

Novel coal mill device for taking air from kiln tail

Technical Field

The utility model relates to a coal mill device is used in cement manufacture processing, concretely relates to novel coal mill device of kiln tail air intaking during cement manufacture processing belongs to cement manufacture processing technology field.

Background

The coal mill is specially used for the superfine grinding of raw coal and bituminous coal in the fields of cement, power plants, steel plants and the like, and the special design and process of the coal mill can ensure that the vertical mill has the requirements of high production efficiency and low energy consumption which cannot be met by a ball mill. In the working process of the coal mill, waste gas (about 200 ℃) from a cement production line (particularly a kiln tail) enters a mill vertical mill under the suction of a system fan, and fully exchanges heat with pulverized coal in the mill, and the pulverized coal is carried to be sorted at a separator. In the prior art, the waste gas discharged from a coal grinding system generally passes through a coarse powder separator and a fine powder separator to a dust remover to remove dust in the waste gas and then is discharged outside. However, the coal mill taking air from the kiln tail of the cement factory has a problem that the drying hot air of the coal mill does not pass through a raw material preparation system, SO SO in the hot air₂The content is high, the pollution discharge problem exists, in addition, in the prior art, cold air needs to be introduced to adjust the system temperature in the coal grinding process, however, in the cold air introducing process, the content of oxygen in the coal grinding mill is increased, and the influence on the grinding quality of raw coal is caused.

Disclosure of Invention

To the not enough of above-mentioned prior art existence, the utility model aims at providing a novel coal mill device of kiln tail air intaking during cement manufacture processing that structural design is reasonable.

In order to achieve the above object, the utility model adopts the following technical scheme: a novel kiln tail air taking coal mill device comprises an air sweeping coal mill, a powder concentrator, a cyclone dust collector and a coal powder bin, wherein one end of the air sweeping coal mill is connected and communicated with a feeding hole and an air inlet, the other end of the air sweeping coal mill is connected and communicated with a discharging pipe, the other end of the discharging pipe is connected and communicated with the air inlet of the powder concentrator, the air outlet of the powder concentrator is connected and communicated with the air inlet of the cyclone dust collector, and an ash hopper at the bottom of the cyclone dust collector is directly or indirectly connected and communicated with the coal powder bin; similarly, an air outlet of the cyclone dust collector is connected with one interface of a second tee joint through a pipeline, one of the other two interfaces of the second tee joint is connected and communicated with the other end of the circulating air pipe, and the other one of the other two interfaces of the second tee joint is connected and communicated with an exhaust gas discharge pipe; and a second electric louver valve is fixedly connected to the circulating air pipe.

Furthermore, an online dust monitor is fixedly connected to the waste gas discharge pipe, the other end of the waste gas discharge pipe is connected to the desulfurizing tower, and an electric butterfly valve is fixedly connected to the waste gas discharge pipe.

Furthermore, a heat insulation structure is fixed on the periphery of the circulating air pipe.

Compared with the prior art, the utility model discloses the beneficial effect who possesses is:

(1) through the arrangement of the circulating air pipe and the like, waste gas discharged from a cyclone dust collector for preparing pulverized coal can be circularly introduced into the air swept coal mill, cold air is not used, the waste gas discharge amount in unit time can be effectively reduced, and the oxygen content in the pulverized coal preparation process is also reduced;

(2) the online dust monitor is arranged on the waste gas discharge pipeline, so that the dust concentration in the waste gas is monitored in real time, once the excessive discharge is found, the machine is stopped for inspection, the reason is found out and the reason is corrected;

(3) the waste gas is introduced into the desulfurizing tower through the waste gas discharge pipe, and sulfur dioxide in the waste gas is subjected to desulfurization treatment, so that the pollution to the environment is reduced.

Drawings

FIG. 1 is a structural connection diagram of the present invention

FIG. 2 is a schematic view of a part of the structure of the present invention

FIG. 3 is a schematic view of the working process of the present invention

The device comprises a powder sweeping coal mill 1.1, a feed inlet 1.2, an air inlet 1.3, a first tee joint 1.4, a discharge pipe 2, a raw coal bin 3, a powder concentrator 4, a cyclone dust collector 5, a coal powder bin 6, a circulating air pipe 7, a kiln tail waste gas conveying pipeline 8, a high-temperature fan 9, a first electric louver valve 10, a pulverized coal ventilator 10.1, a second tee joint 11, a waste gas discharge pipe 12, a second electric louver valve 13, an online dust monitor 14, a desulfurizing tower 15 and an electric butterfly valve.

Detailed Description

The present invention will now be described in further detail with reference to the accompanying drawings. The details of the following sections are all made with reference to the prior art.

As shown in figures 1-3, the novel kiln tail air-taking coal mill device for cement production processing comprises an air swept coal mill 1, a powder concentrator 3, a cyclone dust collector 4, a pulverized coal bin 5 and a raw coal bin 2.

The wind swept coal mill 1 is manufactured by Tangshan dunshi mechanotlite GmbH and has a specification of phi 3.8 x (7.25 + 3.5) m. This 1 one end of wind swept coal mill is feed arrangement, and feed arrangement comprises feed inlet 1.1, air intake 1.2 and support, and fixed mounting has the welt according to conventional mode in the feed inlet, opens the bar valve of 2 bottoms in raw coal bunker, and raw coal is discharged by the bottom discharge gate in raw coal bunker 2 to in the coal mill 1 is swept to the slip of feed inlet after weighing through speed governing belt weigher. The feeding port 1.1 of the air swept coal mill 1 is inclined upwards, the raw coal bin 2 is fixed above the feeding end of the air swept coal mill 1 through a frame, and the bottom discharging port of the raw coal bin 2 is fixedly connected and communicated with the feeding port 1.1 of the air swept coal mill 1; an air inlet 1.2 of the air sweeping coal mill 1 is connected with a first tee joint 1.3 through a flange, the first tee joint 1.3 is communicated with an air inlet 1.2 of the air sweeping coal mill 1, one of the other two interfaces of the first tee joint 1.3 is fixedly connected with one end of a circulating air pipe 6 through a flange, the other interface is also fixedly connected with a kiln tail waste gas conveying pipeline 7 through a flange or welded, the kiln tail waste gas conveying pipeline 7 is connected with a high-temperature fan 8 and a first electric louver valve 9 through flanges, and kiln tail waste gas is introduced into the air sweeping coal mill 1. The other end of the air swept coal mill 1 is provided with a discharging device which is a discharging pipe 1.4, and the discharging pipe 1.4 is fixedly connected and communicated with an air inlet of the powder concentrator 3 in a conventional manner; the powder concentrator 3 is selected from a high-efficiency powder concentrator (model M1500) produced by environmental engineering technology limited of Jiangsu Keshi, and the lower part of a coarse powder outlet at the bottom of one side of the powder concentrator 3 is connected with a screw conveyor, the coarse powder is conveyed into an air swept coal mill 1 through the screw conveyor for re-ball milling, and an air outlet at the top of the powder concentrator 3 is fixedly connected and communicated with an air inlet of a cyclone dust collector 4 through a pipeline in a conventional mode; the cyclone dust collector 4 is a coal bag dust collector (model is LPMM 2X 7D-218) produced by Jiehua environmental protection science and technology Limited in Zhejiang, and an outlet of a bottom ash bucket of the cyclone dust collector 4 can be directly connected and communicated with a top feeding hole of the pulverized coal bunker 5 or can be connected and communicated with top feeding of the pulverized coal bunker 5 through a screw conveyor in a conventional manner. An air outlet of the cyclone dust collector 4 is fixedly connected with a pulverized coal ventilator 10 through a pipeline in a conventional manner, one interface of a second tee joint 10.1 is fixedly connected to the air outlet of the pulverized coal ventilator 10 in a welding manner, one of the other two interfaces of the second tee joint 10.1 is fixedly connected and communicated with the other end of the circulating air pipe 6 in a conventional manner, and the other interface is fixedly connected and communicated with an exhaust gas discharge pipe 11 in a conventional manner; a second electric louver valve 12 is fixedly connected to the circulating air pipe 6 in a conventional manner; an online dust monitor 13 (an online dust monitor manufactured by selecting MODEL of MODEL2030 of QINGDAOKEYONG brand) is fixedly connected to the exhaust gas discharge pipe 11 in a conventional manner, and the other end of the exhaust gas discharge pipe 11 is connected to a desulfurizing tower 14 (a conventional wet desulfurizing tower), and an electric butterfly valve 15 is fixedly connected to the exhaust gas discharge pipe 11. The sulfur dioxide is removed by finally introducing the waste gas in the coal grinding device into the desulfurizing tower 14, so that the standard emission is realized.

The utility model discloses be fixed with insulation construction in circulating air pipe 6's periphery, insulation construction includes the insulation material layer, adorns the protective material layer outward, wherein adorn the material on protective material layer outward for the thick galvanized iron sheet of 0.6mm, and insulation material is compound magnesium aluminum silicate light insulation material, glues on the pipeline outer wall with the adhesive earlier insulation material, and reuse glass cloth is tied up, then ties up fixedly with the galvanized iron wire, will galvanize for the iron sheet self-tapping screw closely fixed in the surface again. The circulating air is conveyed by using the heat insulation pipeline, the circulating air can be effectively ensured to carry a certain temperature (60-100 ℃), the temperature effect of the coal mill entering device due to kiln tail waste gas (about 200 ℃) is better than that of cold air in the circulating air adjustment at the temperature, and the system operation is more stable.

In the actual production, there are two sets the utility model discloses a coal grinds the device, under this kind of condition, two sets of coal grinds device sharing high temperature fan 8, through kiln tail waste gas pipeline 7 through three way connection and two way pipelines of intercommunication, two way pipelines are respectively to two sets of coal grinds device input kiln tail waste gas, and the exhaust gas discharge pipe 11 of last two sets of coal grinds devices gathers into a main pipeline, and this main pipeline carries out the desulfurization with final coal grinds waste gas input in the desulfurizing tower.

The original coal mill device is also connected with a cold air pipe at the air inlet, and the cold air pipe is provided with a cold air valve. Before starting the kiln, fully opening the cold air valve, after feeding for 15 minutes, gradually opening the hot air valve on the kiln tail waste gas conveying pipeline and reducing the cold air valve timely; when the machine is stopped, the hot air valve is closed and the cold air valve is fully opened 15 minutes before stopping the material. Namely, in the original coal grinding process, additional cold air needs to be introduced. However the utility model discloses remove this cold air duct, change into the circulation tuber pipe, will be swept the coal mill by the air-circulating that has certain heat of coal mill in-process, substitute original cold wind with endless coal mill waste gas, relatively speaking, the coal mill waste gas discharge amount in the reducible unit interval also effectively reduces the oxygen content in the buggy preparation process simultaneously (has reduced the oxygen content that cold wind carried).

It is to be noted that the above-mentioned terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (3)

1. A novel kiln tail air taking coal mill device comprises an air sweeping coal mill, a powder concentrator, a cyclone dust collector and a coal powder bin, wherein one end of the air sweeping coal mill is connected and communicated with a feeding hole and an air inlet, the other end of the air sweeping coal mill is connected and communicated with a discharging pipe, the other end of the discharging pipe is connected and communicated with the air inlet of the powder concentrator, the air outlet of the powder concentrator is connected and communicated with the air inlet of the cyclone dust collector, and an ash hopper at the bottom of the cyclone dust collector is directly or indirectly connected and communicated with the coal powder bin; similarly, an air outlet of the cyclone dust collector is connected with one interface of a second tee joint through a pipeline, one of the other two interfaces of the second tee joint is connected and communicated with the other end of the circulating air pipe, and the other one of the other two interfaces of the second tee joint is connected and communicated with an exhaust gas discharge pipe; and a second electric louver valve is fixedly connected to the circulating air pipe.

2. The novel coal mill device for taking out air from kiln tail as claimed in claim 1, wherein an online dust monitor is fixedly connected to the exhaust gas discharge pipe, the other end of the exhaust gas discharge pipe is connected to the desulfurizing tower, and an electric butterfly valve is fixedly connected to the exhaust gas discharge pipe.

3. The novel coal mill device for taking out air from kiln tail according to claim 1 or 2, characterized in that a heat preservation structure is fixed on the periphery of the circulating air pipe.

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