CN214747299U

CN214747299U - Device for producing mineral admixture by using coal gangue

Info

Publication number: CN214747299U
Application number: CN202120376417.3U
Authority: CN
Inventors: 喻庆华; 卢虹宇; 种娜
Original assignee: Jiahua Special Cement Co ltd
Current assignee: Jiahua Special Cement Co ltd
Priority date: 2020-11-26
Filing date: 2021-02-19
Publication date: 2021-11-16
Anticipated expiration: 2031-02-19

Abstract

The utility model discloses a device for producing mineral admixture by coal gangue, a grate bed for placing coal gangue is arranged in a tertiary air pipe of a rotary kiln, a feed inlet and a discharge outlet are arranged on the tertiary air pipe, and the grate bed is obliquely arranged between the feed inlet and the discharge outlet; a material collecting bin is arranged below the tertiary air pipe, the top of the material collecting bin is communicated with a discharge hole, the bottom of the material collecting bin is provided with a feed opening, and a cooling air chamber is arranged in the material collecting bin. The utility model discloses the tertiary air that utilizes the rotary kiln that cement manufacture used to produce the gangue and produce high temperature calcination, the waste gas of calcination is retrieved through the tertiary tuber pipe and is handled, the gangue of calcination completion is collected after the cooling of aggregate bin again, but make full use of cement manufacture equipment and corresponding environmental protection facility, can solve the admixture for cement manufacture, can produce the mineral admixture that the concrete used again, satisfy engineering construction needs, the gangue resource obtains reasonable effective utilization, has very good economy and social.

Description

Device for producing mineral admixture by using coal gangue

Technical Field

The utility model belongs to the technical field of coal chemical industry waste processing, concretely relates to device with gangue production mineral admixture.

Background

The coal gangue is solid waste discharged in the coal mining process and the coal washing process. The coal-containing shale has carbon content of less than 30%, low heat value, and Al as main component₂O₃、SiO₂And unequal amounts of Fe₂O₃CaO, MgO and some trace elements, have relatively good gelling activity and are qualified as pozzolanic active mixed materials. Coal gangue is divided into two main categories, namely kaolinite and hydromica, and the pozzolanic property after calcination is different and is related to the calcination temperature. It is known that coal gangue has the same SiO content₂Besides the main components, the alloy also has the characteristics of high aluminum content, high sulfur content and high iron content.

In the cement industry, coal gangue is commonly used as raw material ingredients, but the dosage proportion is low, and the risk of easy skinning exists. When the coal is used as fuel, the calorific value is too low, and the coal is not cost-effective when being mixed with good coal for use. At present, coal gangue has a plurality of treatment methods, such as coal gangue power generation, coal gangue brick sintering, rotary kiln coal gangue sintering (light-burned dolomite production line), mineral admixture production by coal gangue, and the like. Taking the production of mineral admixture by coal gangue as an example, in the prior art:

in the utility model patent application with publication number CN102173607A and name of a calcining method for manufacturing cement admixture by calcining coal gangue, it is proposed to select a flat ground in the place where coal gangue is piled up, to lay an ignition material layer and a thick coal layer on the ventilation pipeline, to stack coal gangue on the burning layer, to blow air to the pipeline continuously, to calcine coal gangue for 6-7 days and then to cool naturally, to obtain the sinter which can be used as cement admixture. In the practical application process, the laying area of the ventilating duct is large, and the ventilating duct occupies 20-50 square meters; coal is consumed for combustion, so that the cost is high; the coal gangue has long calcining time, is easy to be influenced by weather and is inconvenient to use; in addition, no waste gas treatment is performed in the calcining process, so that the method is not beneficial to environment-friendly production, and the method should be completely eradicated at present.

The utility model discloses a be CN103864325A, in the utility model patent application of the production system of suspension calcination gangue, proposed the gangue that adopts the suspension state, through leading to the hot-blast in the dore furnace after preheating and calcining, then cool off the calcination material of suspension state through cold air, realized thermal recovery and the purification of waste gas simultaneously. In the actual production process, the system has complex flow, high equipment requirement and large process control difficulty, and the coal gangue is preheated, calcined and cooled in a suspension state, so that the process cost is not favorably controlled.

SUMMERY OF THE UTILITY MODEL

For realizing the production of gangue production mineral admixture more economically, the utility model provides a device with gangue production mineral admixture, the tertiary air that the rotary kiln that utilizes cement manufacture to use produced carries out the high temperature heating to the gangue and calcines, the waste gas of calcination gets into decomposing furnace kiln entry system through the tertiary tuber pipe again and participates in thermotechnical process and obtains purification treatment simultaneously, the gangue after the preliminary heating calcination continues to calcine to the collection feed bin, the cooling, then the output of unloading from the bottom of the storehouse, but make full use of cement manufacture equipment and corresponding environmental protection facility, can solve cement manufacture and use the admixture, can produce the mineral admixture that the concrete used again, satisfy engineering construction needs, the heat also can obtain effective recovery, make gangue resource obtain reasonable effective utilization, has very good economy and social.

The utility model discloses a following technical scheme realizes: a device for producing mineral admixture by using coal gangue is characterized in that a grate bed of the coal gangue is arranged in a tertiary air pipe of a rotary kiln, a feed inlet and a discharge outlet are arranged on the tertiary air pipe, the grate bed is obliquely arranged between the feed inlet and the discharge outlet, and the coal gangue flows through the oblique grate bed from the feed inlet to the discharge outlet; a material collecting bin is arranged below the tertiary air pipe, the top of the material collecting bin is communicated with a discharge hole, the bottom of the material collecting bin is provided with a feed opening, and a cooling air chamber is arranged in the material collecting bin.

The coal gangue bin is positioned above the tertiary air pipe and communicated with the feed inlet through a feeder, and the crusher is communicated with the coal gangue bin through a hoister.

The middle part of the material collecting bin is provided with a heat exchange water pipe used by a heat recovery system, and the cooling air chamber is positioned at the lower part of the material collecting bin.

The cooling air chamber is communicated with the fan, and an air outlet of the fan is positioned in the cooling air chamber and is provided with an umbrella-shaped air cap.

The bottom of the material collecting bin is provided with a material sealing pipe, the discharging opening is positioned at the outlet of the material sealing pipe, discharging equipment is arranged at the position of the discharging opening, and a material conveyor is arranged below the discharging equipment.

The grate bed is provided with material blocking strips.

Compared with the prior art, the utility model, following advantage and beneficial effect have:

(1) the utility model discloses the tertiary tuber pipe of the rotary kiln that make full use of had cement manufacture to use sets up the comb bed in the tertiary tuber pipe, utilizes the hot-blast gangue on the hot-blast bed that the tertiary tuber pipe is intraductal to carry out high temperature calcination, and the gangue after calcining gets into the storehouse that gathers materials, calcines the waste gas that produces and enters into the kiln system along with the hot-blast, carries out unified processing. The utility model discloses can add on current cement clinker production facility, not only solve the hot-blast source and the waste heat utilization of high temperature calcination gangue, can also utilize current kiln system to carry out purification treatment to waste gas simultaneously, reduce equipment input by a wide margin, reduce running cost.

(2) Grate bed slope sets up and is equipped with the fender material strip, and the gangue after the breakage is delivered to the grate bed through the batcher, keeps off the velocity of flow that the gangue granule that the material strip can slow down through the grate bed, makes its comparatively abundant heating burning.

(3) The utility model discloses an aggregate bin be a vertical combustor and cooler, can supply the gangue of calcination to continue the burning, also is used for cooling the gangue after calcining simultaneously, blows to the cooling plenum of aggregate bin lower part through high pressure positive blower for the gangue to aggregate bin bottom cools off, and simultaneously, the cooling air flow direction is to aggregate bin upper portion, can continue to burn for the gangue that gets into aggregate bin provides required air.

(4) The utility model discloses adopt the design of material seal pipe in the bottom of aggregate bin, can be used to the lock wind to the cooling plenum of aggregate bin bottom.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

The system comprises 1-tertiary air pipe, 2-grate bed, 3-feed inlet, 4-discharge outlet, 5-aggregate bin, 6-feed outlet, 7-cooling air chamber, 8-coal gangue bin, 9-crusher, 10-feeder, 11-elevator, 12-heat exchange water pipe, 13-fan, 14-umbrella-shaped hood, 15-material sealing pipe, 16-discharge device, 17-material conveyor and 18-material blocking strip.

Detailed Description

The present invention will be described in further detail with reference to examples, but the present invention is not limited thereto.

Example (b):

this embodiment is an apparatus for producing mineral admixture from coal gangue.

As shown in the structure of fig. 1, the device is arranged on a tertiary air pipe 1 of a rotary kiln used for cement production, the tertiary air pipe 1 is used as a calcining area, a grate bed 2 is additionally arranged in the tertiary air pipe 1, a material collecting bin 5, a coal gangue bin 8, a feeder 10, a crusher 9, a fan 13, a discharging device 16, a material conveyor 17 and other devices are additionally arranged outside the tertiary air pipe 1, and the specific process flow and the structure can be summarized as follows:

the coal gangue is sent into a crusher 9 to be crushed into coal gangue particles with the particle size of 3-10mm, the coal gangue particles are sent into a coal gangue bin 8 positioned above a tertiary air pipe 1 by a lifter 11, a feeder 10 is arranged below the coal gangue bin 8, and the coal gangue particles are fed to a grate bed 2 according to a preset flow. A feeding hole 3 is formed in the position, corresponding to the feeder 10, of the tertiary air pipe 1, a material collecting bin 5 is arranged below the tertiary air pipe 1, a discharging hole 4 is formed in the tertiary air pipe 1 corresponding to the material collecting bin 5, the grate bed 2 is obliquely arranged between the feeding hole 3 and the discharging hole 4, and coal gangue particles are fed into the grate bed 2 through the feeding hole 3 and specifically flow from the feeding hole 3 to the discharging hole 4 as shown in fig. 1.

The temperature of tertiary air in the tertiary air pipe 1 is higher than 1000 ℃, when the air-drying device is used, the tertiary air heats and calcines coal gangue particles through the grate bed 2, carbon in the coal gangue is combusted, and hilly stone substances in the coal gangue are dehydrated to become amorphous silicon oxide and aluminum oxide, under the action of gravity and wind force, the heated and calcined coal gangue particles can enter the aggregate bin 5 from the discharge port 4, the air outlet on the grate bed is provided with a guide outlet, so that the coal gangue particles are not easily blocked by the vertical gravity of the coal gangue particles, and the resistance is small. The material blocking strips 18 arranged on the grate bed 2 can slow down the flow velocity of coal gangue particles and improve the calcining effect of the coal gangue particles.

The collecting bin 5 related to the embodiment is a bin for loading calcined coal gangue and is also a vertical burner and a cooler for continuously calcining coal gangue. As shown in the structure of figure 1, the top of a material collecting bin 5 is communicated with a material outlet 4, the middle part is provided with a heat exchange water pipe 12 used by a heat recovery system, the lower part is provided with a cooling air chamber 7, the bottom is provided with a material sealing pipe 15, a material outlet 6 is positioned at the outlet of the material sealing pipe 15, a material discharging device 16 is arranged at the material outlet 6, and a material conveyor 17 is arranged below the material discharging device 16.

After the heated and calcined coal gangue particles enter the aggregate bin 5, the coal gangue particles continue to burn, the heat exchange water pipe 12 arranged in the middle section in the bin cools the coal gangue calcined at high temperature, and meanwhile, heat recovery is carried out, and a heat supply recovery system can be used for generating power if being combined with a waste heat power generation system. The cooling air chamber 7 at the lower part of the aggregate bin 5 is provided with cooling air by a fan 13 (such as a high pressure fan), an air outlet of the fan 13 is positioned in the cooling air chamber 7 and is provided with an umbrella-shaped air cap 14, the fan 13 uses proper cooling air to fully cool the coal gangue particles entering the lower part of the aggregate bin 5 through the air chamber and the air cap, and simultaneously provides proper air for the coal gangue particles at the upper part of the aggregate bin 5 to be continuously combusted. The material sealing pipe can ensure the blanking of the cooled coal gangue particles after calcination and can lock the air of the cooling air chamber 7.

The calcined and cooled coal gangue particles are conveyed to a designated stacking point through a material conveyer 17 (such as a conveying belt) by a material air pipe 15 and a material discharging port 6 through a material discharging device 16 (such as an electromagnetic vibrating feeder 10). When in use, the discharge amount is controlled according to the calcination condition.

The whole equipment of the embodiment is closed, normal production of clinker is not affected, such as the wind speed of a tertiary air duct, the wind quantity and the like, part of heat generated after combustion of the coal gangue enters the decomposing furnace and is utilized by a kiln system, and the other part of the heat generated by cooling the coal gangue is used for waste heat power generation. In actual use, the directly heated metal materials are heat-resistant and oxidation-resistant materials such as grate beds. The material collecting bin 5 is made of refractory materials and plays a role in heat preservation and heat insulation, and is specifically determined according to different using positions.

The above is only the preferred embodiment of the present invention, not to the limitation of the present invention in any form, all the technical matters of the present invention all fall into the protection scope of the present invention to any simple modification and equivalent change of the above embodiments.

Claims

1. The utility model provides a device with mineral admixture of gangue production which characterized in that: a grate bed (2) for placing coal gangue is arranged in a tertiary air pipe (1) of the rotary kiln, a feed port (3) and a discharge port (4) are arranged on the tertiary air pipe (1), and the grate bed (2) is obliquely arranged between the feed port (3) and the discharge port (4); a material collecting bin (5) is arranged below the tertiary air pipe (1), the top of the material collecting bin (5) is communicated with a material outlet (4), a feed opening (6) is arranged at the bottom of the material collecting bin (5), and a cooling air chamber (7) is arranged in the material collecting bin (5).

2. The apparatus for producing mineral admixture using coal gangue as set forth in claim 1 wherein: the coal gangue crusher further comprises a coal gangue bin (8) and a crusher (9), wherein the coal gangue bin (8) is located above the tertiary air pipe (1) and communicated with the feeding hole (3) through a feeder (10), and the crusher (9) is communicated with the coal gangue bin (8) through a hoister (11).

3. The apparatus for producing mineral admixture using coal gangue as set forth in claim 1 wherein: the heat exchange water pipe (12) used by the heat recovery system is arranged in the middle of the material collecting bin (5), and the cooling air chamber (7) is positioned at the lower part of the material collecting bin (5).

4. The apparatus for producing mineral admixture using coal gangue as set forth in claim 3 wherein: the cooling air chamber (7) is communicated with a fan (13), and an air outlet of the fan (13) is positioned in the cooling air chamber (7) and is provided with an umbrella-shaped air cap (14).

5. The apparatus for producing mineral admixture using coal gangue as set forth in claim 1 wherein: the bottom of the aggregate bin (5) is provided with a material sealing pipe (15), the feed opening (6) is positioned at the outlet of the material sealing pipe (15), the feed opening (6) is provided with a discharging device (16), and a material conveyor (17) is arranged below the discharging device (16).

6. The apparatus for producing mineral admixture using coal gangue as set forth in claim 1 wherein: and the grate bed (2) is provided with material blocking bars (18).