CN210480205U

CN210480205U - Pulverized coal additive batching system

Info

Publication number: CN210480205U
Application number: CN201920859069.8U
Authority: CN
Inventors: 汤楚雄; 周少丰; 刘谭璟; 吴昊; 周振华; 秦涔; 闫朝付
Original assignee: Johnson Electric SA
Current assignee: Johnson Electric SA; Wisdri Engineering and Research Incorporation Ltd
Priority date: 2019-06-06
Filing date: 2019-06-06
Publication date: 2020-05-08
Anticipated expiration: 2029-06-06

Abstract

The utility model discloses a pulverized coal additive batching system, including the additive storehouse, adjustable positive displacement feeder, buggy storehouse and coal injection operating system, additive transportation tank car passes through powder pneumatic conveyor pipeline and communicates with the upper shed in additive storehouse, be equipped with weighing sensor A in the additive storehouse, the end opening in additive storehouse communicates with the material loading mouth of adjustable positive displacement feeder, adjustable positive displacement feeder links to each other with the PLC controller, the discharge gate and the buggy storehouse of adjustable positive displacement feeder communicate, install the metering tank between additive storehouse and adjustable positive displacement feeder, the metering tank sets up the weighing sensor B who links to each other with the PLC controller; and an overhauling stop valve is arranged at the outlet of the metering tank. The utility model has the advantages that: the utility model discloses a metering tank and adjustable positive displacement weighing device replace the electron among the traditional configuration spiral ash conveyor of weighing, have simplified the combustion improver and have added technology, under the prerequisite that can reach the same effect, have reduced occupation space position and have reduced investment cost.

Description

Pulverized coal additive batching system

Technical Field

The utility model relates to a metallurgical technology field, concretely relates to buggy additive feed proportioning system.

Background

The blast furnace coal powder injection facility is one of necessary auxiliary facilities of a blast furnace ironmaking process, and mainly comprises two subsystems of coal powder preparation and coal powder injection. In order to improve the combustion efficiency of the pulverized coal in the blast furnace, one of effective ways is to add a combustion improver in the preparation process of the pulverized coal. The conventional combustion improver adding device comprises a combustion improver receiving bin, a bin top dust remover, a weighing system and an electronic weighing spiral ash conveyer, wherein the combustion improver is conveyed to a coal inlet pipe of a coal mill through the spiral ash conveyer. However, the conventional combustion improver adding device has a complex structure and occupies a large space, and particularly, the maintenance workload of the ash conveyor is large, and the one-time investment and the operation cost of the device are high. Therefore, there is a need for improvements in the prior art.

Disclosure of Invention

An object of the utility model is to provide a buggy additive feed proportioning system that occupation space is little, with low costs to prior art not enough.

The utility model adopts the technical proposal that: the utility model provides a buggy additive feed proportioning system, includes additive storehouse, adjustable positive displacement feeder, buggy storehouse and coal injection operating system, and additive transport tank car passes through powder pneumatic conveyor pipeline and the last mouth intercommunication in additive storehouse, is equipped with weighing sensor A in the additive storehouse, and the end opening in additive storehouse passes through the pipeline and communicates with adjustable positive displacement feeder's material loading mouth, and adjustable positive displacement feeder links to each other with the PLC controller, and adjustable positive displacement feeder's discharge gate and buggy storehouse intercommunication.

According to the scheme, a metering tank is arranged between the additive bin and the adjustable volume type feeding device, and the metering tank is provided with a weighing sensor B connected with the PLC; and an overhauling stop valve is arranged at the outlet of the metering tank.

According to the scheme, the batching system is provided with two groups of metering tanks and two groups of adjustable volumetric feeding devices which are arranged in parallel, inlets of the two metering tanks are communicated with outlets of the additive bin respectively, and outlets of the two adjustable volumetric feeding devices converge.

According to the scheme, the pipeline for communicating the additive bin with the adjustable volume type feeding device is a flexible connecting pipe A, and an upper discharging cut-off valve is arranged on the flexible connecting pipe A.

According to the scheme, the discharge hole of the adjustable volume type feeding device is communicated with the coal mill powder outlet pipe, the inlet of the coal mill powder outlet pipe is communicated with the outlet of the medium-speed pulverizer, the outlet of the coal mill powder outlet pipe is communicated with the powder making cloth bag filter, and the powder making cloth bag filter, the coal powder sieve and the coal powder bin are sequentially communicated.

According to the scheme, the discharge port of the adjustable volumetric feeding device is communicated with the raw coal blanking pipe, the inlet of the raw coal blanking pipe is communicated with the outlet of the raw coal feeder, and the outlet of the raw coal blanking pipe is communicated with the inlet of the medium-speed pulverizer.

According to the scheme, the cloth bag filter is arranged at the top of the additive bin.

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

1) the utility model adopts the metering tank and the adjustable volumetric weighing device to replace an electronic weighing spiral ash conveyer in the traditional configuration, simplifies the adding process of the combustion improver, reduces the occupied space position and lowers the investment cost on the premise of reaching the same effect; meanwhile, the tank weighing variable quantity and the flow-adjustable device are integrated to form a closed control system, so that the addition quantity of the additive is monitored in real time, and the flow control intellectualization of the combustion improver is realized;

2) the utility model can send the additive into different process treatment flows by shunting according to the moisture content and granularity of the combustion improver, such as directly entering a coal powder bin of a coal injection system, entering a coal mill outlet pipeline (only drying) or entering a coal mill raw coal dropping pipeline (grinding and drying), the flexibility of a batching system is high, the adaptability is strong, and the failure rate of equipment is low;

3) the utility model discloses rational in infrastructure, the feasibility is high, and operation and maintenance cost are low.

Drawings

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

Wherein: 1. additive transport tanker; 2. powder pneumatic conveying pipeline; 3. a cloth bag filter; 4. an additive bin; 5. a weighing sensor A; 6. an upper discharging cut-off valve; 7. a flexible connecting pipe A; 8. a metering tank; 9. overhauling a cut-off valve; 10. an adjustable volumetric feed device; 11. a flexible connecting pipe B; 12. an additive connecting pipe A; 13. an additive connecting pipe B; 14. an additive connecting pipe C; 15. a coal mill powder outlet pipe; 16. a raw coal belt conveyor; 17. a raw coal bunker; 18. a raw coal feeder; 19. a raw coal blanking pipe; 20. a medium speed coal mill; 21. a powder bag filter; 22. sieving the pulverized coal; 23. a pulverized coal bunker; 24. a PLC controller.

Detailed Description

For a better understanding of the present invention, reference is made to the following detailed description taken in conjunction with the accompanying drawings.

The coal powder additive batching system shown in fig. 1 comprises an additive bin 4, an adjustable volumetric feeding device 10, a coal powder bin 23 and a coal injection operation system, wherein an additive transport tank car 1 is communicated with an upper opening of the additive bin 4 through a powder pneumatic conveying pipeline 2, a weighing sensor A5 is arranged in the additive bin 4, a lower opening of the additive bin 4 is communicated with a feeding opening of the adjustable volumetric feeding device 10 through a pipeline, the adjustable volumetric feeding device 10 is connected with a PLC (programmable logic controller) 24, and a discharging opening of the adjustable volumetric feeding device 10 is communicated with the coal powder bin 23. In the embodiment, the pipeline for communicating the additive bin 4 with the adjustable volumetric feeding device 10 is a flexible connecting pipe A7, and an upper discharging cut-off valve 6 is arranged on the flexible connecting pipe; the discharge hole of the adjustable volumetric feeding device 10 is communicated with a soft connecting pipe B11, and the soft connecting pipe B11 is communicated with the pulverized coal bin 23 through an additive connecting pipe C14; the adjustable volume type feeding device 10 controls the rotating speed by a variable frequency motor, and quantitatively adds the additive according to the proportion required by the coal powder proportioning.

In order to improve the batching precision, a metering tank 8 is arranged between the additive bin 4 and the adjustable volume type feeding device 10, and the metering tank 8 is provided with a weighing sensor B connected with a PLC 24; an inspection shut-off valve 9 is installed at the outlet of the metering tank 8. The weighing sensor is used for detecting the weight of the additive in the metering tank 8, and when the weight of the additive in the metering tank 8 is lower than a certain set value, the PLC 24 sends a material emptying signal instruction and opens the lower discharging cut-off valve; when the weight of the additive in the metering tank 8 is lower than a certain set value, the PLC 24 sends a material full signal instruction to close the upper discharging cut-off valve 6.

In order to further improve the batching precision, two groups of metering tanks 8 and adjustable volume type feeding devices 10 which are arranged in parallel can be arranged, the inlets of the two metering tanks 8 are respectively communicated with the outlets of the additive bin 4, and the outlets of the two adjustable volume type feeding devices 10 are converged and enter the same pipeline.

Preferably, the discharge port of the adjustable positive displacement feeding device 10 is communicated with the coal mill powder outlet pipe 15 through a soft connection pipe B11 and an additive connection pipe B13, the inlet of the coal mill powder outlet pipe 15 is communicated with the outlet of the medium-speed pulverizer, the outlet of the coal mill powder outlet pipe 15 is communicated with the coal pulverizing cloth bag filter 21, the coal sieve 22 and the coal powder bin 23 are sequentially communicated, specifically, the outlet of the medium-speed pulverizer is communicated with the inlet of the coal pulverizing cloth bag filter 21 through the coal mill powder outlet pipe 15, the outlet of the coal pulverizing cloth bag filter 21 is communicated with the inlet of the coal sieve 22, and the outlet of the coal sieve 22 is communicated with the coal powder bin 23.

Preferably, the discharge port of the adjustable volumetric feeding device 10 is communicated with the raw coal blanking pipe 19 through a soft connecting pipe B11 and an additive connecting pipe a12, the inlet of the raw coal blanking pipe 19 is communicated with the outlet of the raw coal feeder 18 (the inlet of the raw coal feeder 18 is communicated with the outlet of the raw coal bunker 17, the discharge end of the raw coal belt conveyor 16 is located above the raw coal bunker 17), and the outlet of the raw coal blanking pipe 19 is communicated with the inlet of the medium-speed mill. In the present invention, the adjustable volumetric feeding device 10 is prior art.

Preferably, a cloth bag filter 3 is installed at the top of the additive bin 4, and the conveying gas for conveying the additive is filtered by the cloth bag filter 3 and then discharged into the atmosphere.

The utility model discloses a theory of operation does: the coal feeding quantity signal and the additive proportioning value of the raw coal feeder 18 are input into a PLC 24; the additive is conveyed to an additive bin 4 from an additive transport tank car 1 through a powder pneumatic conveying pipeline 2 and then enters a metering tank 8; the weighing sensor B uploads a tank weighing variation signal of the metering tank 8 to the PLC 24; and after receiving the tank weighing variation signal of the metering tank 8, the PLC controls the rotating speed of the adjustable volumetric feeding device 10 to adjust the additive distribution flow to be t/h or kg/h according to the set additive distribution ratio. When the metering tank 8 receives the additive (receiving material), the adjustable volumetric feeding device 10 outputs the additive amount according to the previous flow calculation. In order to simplify the batching process flow, the metering tank 8 and the overhaul shut-off valve 9 can be omitted, at the moment, the weighing sensor A5 is connected with the PLC 24, and the weighing sensor A5 uploads a tank weighing variation signal of the additive bin 4 to the PLC 24; the PLC 24 receives the tank weighing variation signal of the additive bin 4 and then controls the rotating speed of the adjustable volumetric feeding device 10 to adjust the additive distribution flow according to the set additive distribution value, and the metering precision of the process is slightly poor (because the self weight and the material weight of the additive bin 4 are large, and the metering of the additive bin 4 is influenced during the period that the additive bin 4 receives the additive from the additive transportation tank car 1). In order to further improve the batching precision, two groups of metering tanks 8 which are parallel and two groups of adjustable volumetric feeding devices 10 can be arranged, the two metering tanks 8 discharge materials in turn, no material is fed during the material discharge, and the metering precision is slightly higher.

The utility model discloses in, adjustable positive displacement feeder 10 exhaust additive can be according to granularity and water content branch flow to three place: 1. the additive has larger granularity and flows into the raw coal blanking pipe 19 when the additive does not meet the combustion requirement in the blast furnace; 2. when the particle size of the additive meets the requirement and the water content does not meet the requirement, the additive flows into a powder outlet pipe 15 of a coal mill; 3. when the particle size and the water content of the additive meet the requirements, the additive enters the coal powder bin 23. The scheme that the additive is sent to the pulverized coal bunker 23 is the optimal selection; feeding the additive to the pulverizer outlet 15 is the most uneconomical solution, requiring increased power consumption and increased wear on equipment and piping.

Claims

1. The pulverized coal additive batching system is characterized by comprising an additive bin, an adjustable volume type feeding device, a pulverized coal bin and a coal injection operation system, wherein an additive transport tank car is communicated with an upper opening of the additive bin through a powder pneumatic conveying pipeline, a weighing sensor A is arranged in the additive bin, a lower opening of the additive bin is communicated with a feeding opening of the adjustable volume type feeding device, the adjustable volume type feeding device is connected with a PLC (programmable logic controller), and a discharging opening of the adjustable volume type feeding device is communicated with the pulverized coal bin.

2. The pulverized coal additive batching system as defined in claim 1, wherein a metering tank is installed between the additive bin and the adjustable volumetric feeding device, the metering tank being provided with a weighing sensor B connected with a PLC controller; and an overhauling stop valve is arranged at the outlet of the metering tank.

3. The pulverized coal additive blending system according to claim 1, wherein the blending system is provided with two groups of metering tanks and two groups of adjustable volumetric feeding devices which are arranged in parallel, inlets of the two metering tanks are respectively communicated with outlets of the additive bin, and outlets of the two adjustable volumetric feeding devices converge.

4. The pulverized coal additive blending system according to claim 1, wherein the pipeline communicating the additive bin with the adjustable volumetric feeding device is a flexible connecting pipe a provided with an upper discharge shut-off valve.

5. The pulverized coal additive blending system of claim 1, wherein a discharge port of the adjustable positive displacement feeder is communicated with a coal mill powder outlet pipe, an inlet of the coal mill powder outlet pipe is communicated with an outlet of the medium-speed pulverizer, an outlet of the coal mill powder outlet pipe is communicated with a coal pulverizing cloth bag filter, and the coal pulverizing cloth bag filter, the coal powder screen and the coal powder bin are sequentially communicated.

6. The pulverized coal additive blending system according to claim 5, wherein a discharge port of the adjustable positive displacement feeding device is communicated with a raw coal blanking pipe, an inlet of the raw coal blanking pipe is communicated with an outlet of a raw coal feeder, and an outlet of the raw coal blanking pipe is communicated with an inlet of a medium-speed mill.

7. The pulverized coal additive blending system according to claim 1, wherein a cloth bag filter is installed at the top of the additive bin.