Coal conveying system of gasification furnace

Abstract

The coal conveying system comprises a coal feeder, a discharge port of the coal feeder is connected with a feed port of a roller screen, an oversize product outlet of the roller screen is connected with a feed port of a belt weigher, a discharge port of the belt weigher is connected with a feed port of a gasifier stock bin, and an undersize product outlet of the roller screen is connected with a feed port of a boiler stock bin; the system further comprises a limestone hopper, a discharge port of the limestone hopper is connected with a feed port of the feeder, and a discharge port of the feeder is connected with a feed port of the belt weigher. A coal feeder operation signal and belt weigher measurement data are used as start-stop signals of the limestone feeder, so that limestone is input under the condition that coal is normally conveyed in the coal conveying process, uneven limestone batching caused by misoperation of personnel is effectively avoided, and the influence of fluctuation of the operation condition of a gasification furnace and the like is avoided.

Description

Technical field:

[0001] The utility model relates to the field of coal conveying systems, in particular to a coal conveying system for a gasifier. Background technology:

[0002] In the lignite gasification production, the coal delivered by the coal feeder is screened by a roller screen, and the material on the screen is sent to the gasifier silo as raw coal for the gasification process. Before being sent to the gasifier silo, a certain proportion of flux limestone will be added to the raw coal to ensure that the gasifier can discharge slag smoothly; and the material under the roller screen is sent to the boiler as fuel coal for the heating and power supply device.

[0003] However, in the actual production process, since limestone is a separate conveying system, workers are required to adjust the operation of the limestone system according to the actual coal transportation situation. If the coal feeder is cut off, due to the long distance of the coal conveyor belt, workers cannot make timely judgments, and the limestone system is still running. The limestone is fed separately, resulting in unstable limestone ratio, affecting the smooth slag discharge of the gasifier, and then causing the gasifier to be unable to operate stably. Utility model content:

[0004] The utility model aims to provide a coal conveying system for a gasifier.

[0005] The utility model is implemented by the following technical solutions:

[0006] A coal conveying system for a gasifier, comprising a coal feeder, wherein the discharge port of the coal feeder is connected to the feed port of a roller screen, the screened material outlet of the roller screen is connected to the feed port of a belt scale, the discharge port of the belt scale is connected to the feed port of a gasifier silo, and the screened material outlet of the roller screen is connected to the feed port of a boiler silo; it also comprises a limestone hopper, wherein the discharge port of the limestone hopper is connected to the feed port of the feeder, and the discharge port of the feeder is connected to the feed port of the belt scale;

[0007] The operation signal output terminal of the coal feeder and the data output terminal of the belt scale are electrically connected to the signal input terminal of the controller, and the signal output terminal of the controller is electrically connected to the signal input terminal of the feeder.

[0008] Preferably, the coal feeder and roller screen, the roller screen and belt scale, the roller screen and boiler silo, the belt scale and gasifier silo, and the feeder and belt scale are all connected via a belt conveyor.

[0009] Preferably, the discharging port of the belt conveyor connecting the feeder and the belt scale is placed on the top of the belt conveyor connecting the roller screen and the belt scale.

[0010] The utility model has the advantages that by using the coal feeder operation signal and the belt scale measurement data as the start and stop signals of the limestone feeder, it is ensured that the limestone is added when the coal is transported normally during the coal transportation process, and it is effectively prevented that the limestone is unevenly distributed due to misoperation by personnel, and the fluctuation of the operating conditions of the gasifier is avoided. Description of the drawings:

[0011] Figure 1 It is a structural schematic diagram of the utility model.

[0012] In the figure: coal feeder 1, roller screen 2, belt scale 3, gasifier silo 4, boiler silo 5, limestone hopper 6, feeder 7, controller 8, belt conveyor 9. Specific implementation method:

[0013] like Figure 1 As shown, a coal conveying system for a gasifier includes a coal feeder 1, the discharge port of the coal feeder 1 is connected to the feed port of a roller screen 2, the screened material outlet of the roller screen 2 is connected to the feed port of a belt scale 3, the discharge port of the belt scale 3 is connected to the feed port of a gasifier silo 4, and the screened material outlet of the roller screen 2 is connected to the feed port of a boiler silo 5; it also includes a limestone hopper 6, the discharge port of the limestone hopper 6 is connected to the feed port of a feeder 7, and the discharge port of the feeder 7 is connected to the feed port of the belt scale 3; the operation signal output end of the coal feeder 1 and the data output end of the belt scale 3 are electrically connected to the signal input end of a controller 8, and the signal output end of the controller 8 is electrically connected to the signal input end of the feeder 7;

[0014] During production, the coal feeder 1 quantitatively delivers the lignite in the coal shed, and the roller screen 2 screens the coal. The screened material is large pieces of lignite, which are weighed by the belt scale 3 and sent to the gasifier silo 4 as raw coal for the gasifier. Under normal operation, the weighing data of the belt scale 3 is 250-330t / h, and the screened material is sent to the boiler silo 5 as a heating and power supply device as fuel coal; limestone is discharged from the limestone hopper 6 and quantitatively delivered to the belt scale 3 through the feeder 7 to be mixed with the raw coal; in this process, the coal feeder 1 sends the operation signal and the belt scale 3 sends the weighing data to the controller 8 respectively;

[0015] After the coal feeder 1 feedbacks the operating signal with a delay of 210 seconds and the belt scale 3 displays a value not less than 100t / h, the controller 8 controls the feeder 7 to deliver limestone in a quantitative manner; after the coal feeder 1 feeds back the stop signal and the belt scale 3 displays a value higher than or lower than 100t / h, the controller 8 controls the feeder 7 to stop delivering limestone; by using the coal feeder 1 operating signal and the belt scale 3 measurement data as the start and stop signals of the limestone feeder 7, it is ensured that limestone is added only when coal is transported normally during the coal transportation process, effectively preventing personnel from operating incorrectly and causing uneven limestone batching, thereby avoiding fluctuations in the operating conditions of the gasifier and other impacts.

[0016] The coal feeder 1 and the roller screen 2, the roller screen 2 and the belt scale 3, the roller screen 2 and the boiler silo 5, the belt scale 3 and the gasifier silo 4, and the feeder 7 and the belt scale 3 are all connected through a belt conveyor 9. Since the distances between the various devices are relatively far, the coal and limestone are transported through the belt conveyor 9.

[0017] The discharge port of the belt conveyor 9 connecting the feeder 7 and the belt scale 3 is placed on the top of the belt conveyor 9 connecting the roller screen 2 and the belt scale 3. In order to ensure that no limestone is directly delivered to the belt scale 3 to instantly affect the weighing data of the belt scale 3, the limestone is delivered to the belt conveyor 9 at the front end of the belt scale 3 and mixed with the coal to ensure the stable operation of the belt scale 3.

[0018] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A coal conveying system for a gasifier, characterized in that: It includes a coal feeder, wherein the discharge port of the coal feeder is connected to the feed port of the roller screen, the screened material outlet of the roller screen is connected to the feed port of the belt scale, the discharge port of the belt scale is connected to the feed port of the gasifier silo, and the screened material outlet of the roller screen is connected to the feed port of the boiler silo; It also includes a limestone hopper, a discharge port of the limestone hopper is connected to a feed port of a feeder, and the discharge port of the feeder is connected to a feed port of the belt scale; The operation signal output terminal of the coal feeder and the data output terminal of the belt scale are electrically connected to the signal input terminal of the controller, and the signal output terminal of the controller is electrically connected to the signal input terminal of the feeder.

2. A coal conveying system for a gasifier according to claim 1, characterized in that: The coal feeder and roller screen, the roller screen and belt scale, the roller screen and boiler silo, the belt scale and gasifier silo, and the feeder and belt scale are all connected through a belt conveyor.

3. A coal conveying system for a gasifier according to claim 2, characterized in that: The discharging port of the belt conveyor connecting the feeder and the belt scale is placed on the top of the belt conveyor connecting the roller screen and the belt scale.

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