CN211903501U - A kind of coal slime slag mixing drying device - Google Patents

Abstract

The utility model relates to the technical field of coal slime rapid drying, in particular to a coal slime slag mixing drying device. It includes a mixed heat exchange silo, a slag silo, a coal slime storage and transportation silo, a secondary air input pipeline and a starting bed silo. The left and right side walls of the mixed heat exchange silo are respectively provided with a slag inlet and a coal slime inlet, which pass through the pipes respectively. Correspondingly connected to the slag bin and the coal slime storage and conveying bin, the bottom of the slag bin is provided with a slag outlet, and the top of the mixed heat exchange bin is provided with a flue gas discharge port, which is connected to the tail flue through a pipeline, the mixing The bottom of the heat exchange chamber is provided with a secondary air input port, the secondary air input port is communicated with a secondary air input pipe, and a steam extraction air is installed on the secondary air input pipe near the secondary air input port. The heating device is provided with a mixed material output port on the side wall of the mixing heat exchange bin near the bottom, which is connected to the starting bed bin through a pipeline. The utility model has the advantages of convenient installation and great economic benefit and production benefit.

Description

A kind of coal slime slag mixing drying device

technical field

The utility model relates to the technical field of coal slime rapid drying, in particular to a coal slime slag mixing drying device.

Background technique

Today, with the gradual popularization of new energy sources such as wind power and photovoltaic power generation, traditional thermal power plants are struggling, and today's environmental protection pressure has increased sharply, which has greatly increased the cost of coal transportation and the cost of power generation. After the circulating fluidized bed unit has undergone the "deep peak regulation" transformation, the output of the equipment is largely idle during the deep regulation period (the unit load is reduced to 30% of the rated load), and there is no effective means of utilization. Many thermal power plants take advantage of their geographic location to burn local coal slime to reduce power generation costs. However, the moisture content of the slime itself is relatively large, and there is no practical method to send it into the furnace in large quantities, and a small amount of mixed burning does not help significantly to reduce costs.

Therefore, it is necessary to solve the above problems.

Utility model content

In view of the above problems, the utility model provides a coal slime slag mixing drying device, which solves the problem that the existing thermal power plants cannot dry a large amount and quickly when the coal slime is mixed. The technical scheme adopted by the utility model is as follows:

A coal slime slag mixing drying device, comprising a mixing heat exchange bin, a slag bin, a coal slime storage and conveying bin, a secondary air input pipeline and a starting bed silo. The left and right side walls of the mixed heat exchange bin are respectively provided with The slag inlet and the coal slime inlet are respectively connected to the slag silo and the coal slime storage and conveying silo through pipes, the bottom of the slag silo is provided with a slag outlet, and the top of the mixed heat exchange silo is provided with a flue gas outlet, through which a slag outlet is provided. The pipeline is connected to the tail flue, the bottom of the mixed heat exchange bin is provided with a secondary air input port, the secondary air input port is communicated with the secondary air input pipe, and the secondary air input pipe is close to the secondary air A steam extraction air temperature heating device is installed at the position of the input port, and a mixed material output port is opened on the side wall of the mixing heat exchange bin near the bottom, which is connected to the starting bed bin through a pipeline.

An air bag dust removal device is installed on the pipe between the flue gas outlet at the top of the mixed heat exchange bin and the tail flue, and a return pipe is connected to the bottom of the air bag dust removal device. The tube is connected to the mixing heat exchange chamber.

A pneumatic actuator is arranged on the pipeline connected between the slag bin and the mixing heat exchange bin, and the pneumatic actuator is an electromagnetic control valve, which can control the start and stop of the discharging.

A coal slime screw feeder is arranged on the pipeline connected between the coal slime storage and transportation bin and the mixed heat exchange bin, which can quantitatively introduce the coal slime into the mixed heat exchange bin.

A silo pump is installed on the pipeline from the mixed material output port to the starting bed silo, and the silo pump generates compressed air to quickly transport the mixed particles to the starting bed silo.

An air cap is installed above the secondary air input port to compress and pressurize the secondary air entering the mixed heat exchange chamber.

Temperature measuring elements are respectively installed at the positions near the bottom and the top of the mixing heat exchange chamber, and the temperature measuring elements are subjected to anti-wear treatment to monitor the temperature of the upper and lower mixtures in real time.

A humidity sensor is also installed on the flue gas output pipe at the top of the mixed heat exchange bin to judge the humidity of the slag-slime mixture.

The steam extraction air temperature heating device is a 5 extraction heat exchanger.

Compared with the prior art, the beneficial effects of the present utility model are:

1. The utility model adopts the slag and coal slime of the circulating fluidized bed boiler to mix, and through the double heat exchange mixing of the secondary air after the heat exchange of the 5-stage extraction steam heat exchanger, the heat exchange speed can be improved to the greatest extent, and the coal slime can be greatly improved. drying faster.

2. The utility model utilizes the high temperature of the slag discharged from the circulating fluidized bed boiler, and makes full use of the waste heat of the boiler slag by mixing the slag and coal slime to realize the waste heat recovery of the slag and make the heat exchange process more energy-saving.

3. The utility model makes the coal slime and slag in the heat exchanger in a fluidized and suspended state through the dual action of the secondary air and the air cap, and is fully mixed, the heat exchange is more uniform and fast, and the drying of the coal slime and the slag is more uniform.

4. The utility model utilizes the dual detection functions of the temperature measuring element and the humidity detector to more accurately judge the drying degree of the slime, avoid the drying time being too short or too long, and make the drying process more intelligent.

In conclusion, the utility model has the advantages of ingenious design, convenient installation, great economic benefit and production benefit, and is suitable for being widely used in circulating fluidized bed thermal power plants.

Description of drawings

Fig. 1 is the structural representation of the utility model;

In the figure: 1 is the mixing heat exchange silo, 2 is the slag silo, 3 is the coal slime storage and conveying silo, 4 is the secondary air input pipeline, 5 is the starting bed silo, 6 is the extraction air temperature heating device, and 7 is the wind Bag dust removal device, 8 is a return pipe, 9 is a pneumatic actuator, 10 is a slime screw feeder, 11 is a silo pump, 12 is an air cap, 13 is a temperature measuring element, and 14 is a humidity sensor.

Detailed ways

The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the implementations. example. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

Referring to FIG. 1, the utility model provides a coal slime slag mixing drying device, including a mixing heat exchange bin 1, a slag bin 2, a coal slime storage and conveying bin 3, a secondary air input pipeline 4 and a starting bed bin 5, The body of the hybrid heat exchange bin 1 adopts a structure similar to that of a circulating fluidized bed boiler, and the left and right side walls are respectively provided with a slag inlet and a coal slime inlet, which are respectively connected to the slag bin 2 and the coal slime storage and transportation bin through pipes. 3. The bottom of the slag bin 2 is originally provided with a slag outlet. In this utility model, another outlet is opened on the right side of the original slag outlet, which is connected to the mixing heat exchange bin 1 through a pipeline, and is controlled by a pneumatic actuator 9. For the start and stop of discharging, the pneumatic actuator 9 is an electromagnetic control valve, which can realize automatic control.

A slime screw feeder 10 is arranged on the pipeline connecting the coal slime storage and transportation bin 3 and the mixed heat exchange bin 1, which can quantitatively control the coal slime introduced into the mixed heat exchange bin 1. When it is not discharged, the coal slime is not introduced into the mixed heat exchange bin 1 .

The top of the mixed heat exchange bin 1 is provided with a flue gas discharge port, which is connected to the tail flue through a pipe, and an air bag is installed on the pipe between the flue gas discharge port on the top of the mixed heat exchange bin 1 and the tail flue. Device 7, the bottom of the air bag dust removal device 7 is connected with a return pipe 8, and the air bag dust removal device 7 is connected to the mixing heat exchange bin 1 through the return pipe 8. The dust and flue gas generated after the mixed heat exchange are filtered by the bag dust removal device 7 connected to the upper right corner to remove the dust and flue gas, and the large particle slag is transported to the mixed heat exchange bin 1 through the return pipe 8 for heat exchange again to realize the cycle. Dry slime.

The bottom of the hybrid heat exchange bin 1 is provided with a secondary air input port, the secondary air input port is communicated with a secondary air input pipe 4, and the secondary air input pipe 4 is located close to the secondary air input port. The steam extraction air temperature heating device 6 is installed on it. In this utility model, the steam extraction air temperature heating device 6 uses a 5-extraction heat exchanger. To heat the secondary air, a header device is used, and a loop-shaped heating pipe is arranged inside. There are 5 stages of extraction steam in the pipe. The slag and slime are quickly mixed and dehydrated quickly, which improves the overall efficiency of the heat exchanger and realizes the heating of the secondary air. It is introduced into the mixed heat exchange bin 1 for drying the slime, and the extraction steam after heat exchange is sent to the deaerator to continue to participate. Do work, and automatically adjust the heated air temperature through the drain door. Further, an air cap 12 is installed above the secondary air input port to compress and pressurize the secondary air entering the mixing heat exchange bin 1, so as to realize the high-speed rotation and mixing of the slag and slime mixture in the heat exchanger.

The mixed material output port is opened on the side wall near the bottom of the mixed heat exchange bin 1, which is connected to the starting bed silo 5 through a pipeline, and a silo pump 11 is installed on the pipeline from the mixed material output port to the starting bed silo 5 , The silo pump 11 is used for conveying the mixed particles of dried coal slime and slag. Under the action of compressed air, the mixed particles are in a fluidized state, which is convenient for the drying and mixed particles to be quickly transported to the starting bed silo 5.

The temperature measuring elements 13 are respectively installed at the positions near the bottom and the top of the hybrid heat exchange bin 1, and the temperature measuring elements 13 are subjected to anti-wear treatment to monitor the temperature of the upper and lower mixtures in real time; the flue gas output at the top of the hybrid heat exchange bin 1 A humidity sensor 14 is also installed on the pipeline to determine the humidity of the slag-slime mixture, and the slag-slag mixture that meets the specified requirements is transported to the starting bed silo 5 through the silo pump 11, and further sent to the boiler for combustion.

The design principle of the present utility model is:

The utility model utilizes circulating fluidized bed boiler slag and coal slime for mixed heat exchange, the coal slime storage and transportation bin 3 is used for storing coal slime, and the slag bin 2 stores slag. It is transported to the mixing heat exchange bin 1, and the waste residue is mixed at the same time to prevent the coal slime from sticking in the feeder due to large moisture and block the feeder, and it can facilitate the mixing of the coal slime in the heat exchanger and ensure the reliable supply of the coal slime. , the mixture is stirred and dried by the secondary air heated by the 5-stage extraction steam, and is pressurized by the air cap 12 to achieve the purpose of drying the slime quickly. temperature measuring element 13,

A humidity detector 14 is installed before the bag filter in the upper flue to comprehensively judge the drying degree of the coal slime. After reaching the standard, it is transported to the starting bed silo 5 through the silo pump 12 and the connected pipeline for the combustion of the boiler.

Only the preferred embodiments of the present utility model have been described in detail above, but the present utility model is not limited to the above-mentioned embodiments, and within the scope of knowledge possessed by those of ordinary skill in the art, it is also possible to do so without departing from the purpose of the present utility model. Various changes are made below, and all changes should be included within the protection scope of the present invention.

Claims (9)

1. The utility model provides a coal slime slag mixes drying device which characterized in that: comprises a mixed heat exchange bin (1), a slag bin (2), a coal slime storage conveying bin (3), a secondary air input pipeline (4) and a starting bed bin (5), wherein a slag inlet and a coal slime inlet are respectively formed in the left side wall and the right side wall of the mixed heat exchange bin (1), the mixed heat exchange bin is correspondingly connected to the slag bin (2) and the coal slime storage conveying bin (3) through pipelines respectively, a slag outlet is formed in the bottom of the slag bin (2), a flue gas outlet is formed in the top of the mixed heat exchange bin (1), the mixed heat exchange bin is connected to a tail flue through a pipeline, a secondary air input port is formed in the bottom of the mixed heat exchange bin (1), the secondary air input port is communicated with the secondary air input pipeline (4), a steam extraction air temperature heating device (6) is installed on the position, close to the secondary air input port, of the mixed heat exchange bin (1) is close to the side wall of the bottom, and a mixture output port, is communicated to a starting bed bin (5) through a pipeline.

2. The coal slime slag mixing and drying device of claim 1, which is characterized in that: an air bag dust removal device (7) is mounted on a pipeline between a flue gas outlet at the top of the mixed heat exchange bin (1) and a tail flue, a material return pipe (8) is connected to the bottom of the air bag dust removal device (7), and the air bag dust removal device (7) is connected with the mixed heat exchange bin (1) through the material return pipe (8).

3. The coal slime slag mixing and drying device of claim 1, which is characterized in that: and a pneumatic actuator (9) is arranged on a pipeline communicated between the slag bin (2) and the mixed heat exchange bin (1), and the pneumatic actuator (9) is an electromagnetic control valve and can control the starting and stopping of the discharging.

4. The coal slime slag mixing and drying device of claim 1, which is characterized in that: and a coal slime screw feeder (10) is arranged on a pipeline communicated between the coal slime storage and conveying bin (3) and the mixed heat exchange bin (1), and can quantitatively guide coal slime into the mixed heat exchange bin (1).

5. The coal slime slag mixing and drying device of claim 1, which is characterized in that: the device is characterized in that a bin pump (11) is installed on a pipeline from the mixture output port to the starting bed material bin (5), the bin pump (11) generates compressed air, and mixed particles are rapidly conveyed to the starting bed material bin (5).

6. The coal slime slag mixing and drying device of claim 1, which is characterized in that: and a blast cap (12) is arranged above the secondary air input port, and is used for compressing and pressurizing secondary air entering the mixed heat exchange bin (1).

7. The coal slime slag mixing and drying device of claim 1, which is characterized in that: the mixed heat exchange bin (1) is close to the positions of the bottom and the top and is respectively provided with a temperature measuring element (13), and the temperature measuring element (13) is used for performing anti-abrasion treatment and monitoring the temperature of the upper mixture and the lower mixture in real time.

8. The coal slime slag mixing and drying device of claim 1, which is characterized in that: and a humidity sensor (14) is also arranged on the flue gas output pipeline at the top of the mixed heat exchange bin to judge the humidity of the slag and coal slime mixture.

9. The coal slime slag mixing and drying device of claim 1, which is characterized in that: the steam extraction air temperature heating device (6) is a 5-extraction heat exchanger.

Images