Combustion recycling injection system for carbon dedusting ash boiler

Abstract

The utility model discloses a combustion recycling injection system for a carbon dedusting ash boiler, which comprises an injection tank, a feed port of the injection tank is connected with a discharge port of a carbon dedusting ash storage bin, a vertical rotary feeder is mounted at the discharge port of the injection tank, a discharge port of the vertical rotary feeder is connected with an injection pipeline, and the injection pipeline is connected with a discharge port of the vertical rotary feeder. A blowing inlet of the blowing pipeline is connected with an outlet of the gas storage tank through a pipeline blowing valve, a blowing outlet of the blowing pipeline is connected with a coal dropping pipe of the boiler, an inlet valve is installed at a feeding port of the blowing tank, an outlet valve is installed at a discharging port of the vertical rotary feeder, and a tank gas pressure gauge is installed on the blowing tank. A pipeline gas pressure gauge is installed on the injection pipeline, an inflation valve is installed on the injection tank and connected with an outlet of the gas storage tank, and a pressure release valve is further installed on the injection tank. The carbon dedusting ash generated in the industrial production process is recycled in the mode that the carbon dedusting ash is directly blown into the boiler for combustion, and the device is easy to implement, low in cost and suitable for popularization.

Description

Technical Field

[0001] The utility model relates to a device for recycling carbon dust generated in an industrial production process, in particular to a carbon dust boiler combustion recycling and blowing system. Background Art

[0002] Various carbon dusts are often generated during industrial production processes, such as coke and dry quenching dust from the steel industry, and various semi-coke and lignite dusts from the calcium carbide and chemical industries. Carbon dust has a high recycling value due to its high calorific value. The current industry practice for handling carbon dust is to mix the dust with coal on a coal conveyor belt, then feed it into a mill for grinding and recycling. In practice, this approach has the following drawbacks: First, the fine particles of carbon dust easily cause secondary pollution when they fall onto the coal conveyor belt; second, the hard and abrasive particles of carbon dust cause significant wear on the mill after entering it, shortening its service life and increasing maintenance costs. Utility Model Content

[0003] The purpose of the utility model is to provide a carbon dust removal ash boiler combustion recovery and utilization blowing system, which can recycle and reuse the carbon dust removal ash generated in the industrial production process by directly blowing it into the boiler for combustion. It is easy to implement and low in cost, and is suitable for promotion.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A carbon material dust removal boiler combustion recovery and utilization blowing system includes a blowing tank, the feeding port of the blowing tank is connected to the discharging port of the carbon material dust removal ash storage bin, the discharging port of the blowing tank is equipped with a vertical rotary feeder, the discharging port of the vertical rotary feeder is connected to the blowing pipe, the blowing inlet of the blowing pipe is connected to the outlet of the gas storage tank via a pipeline blowing valve, and the blowing outlet of the blowing pipe is connected to the coal drop pipe of the boiler, wherein an inlet valve is installed at the feeding port of the blowing tank, an outlet valve is installed at the discharging port of the vertical rotary feeder, a tank gas pressure gauge is installed on the blowing tank, a pipeline gas pressure gauge is installed on the blowing pipe, an inflation valve is installed on the blowing tank and the inflation valve is connected to the outlet of the gas storage tank, and a pressure relief valve is also installed on the blowing tank.

[0006] The advantages of the utility model are:

[0007] The utility model can recycle and reuse the carbon dust generated in the industrial production process by directly blowing it into the boiler for combustion. The whole blowing process has no secondary pollution problem, and solves the problem of carbon dust with large particle hardness and strong abrasiveness entering the vertical rotary feeder and causing wear, thereby extending the service life of the equipment. The whole system has high operating efficiency, is easy to implement and has low cost, and is suitable for promotion. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 It is a schematic diagram of the composition of the utility model carbon material dust removal boiler combustion recovery and utilization injection system. DETAILED DESCRIPTION

[0009] like Figure 1 As shown, the utility model provides a carbon material dust removal boiler combustion recovery and utilization blowing system, including a blowing tank 40, the feeding port of the blowing tank 40 is connected to the discharge port of the carbon material dust removal ash storage bin 10, the discharge port of the blowing tank 40 is installed with a vertical rotary feeder 50, the discharge port of the vertical rotary feeder 50 is connected to the blowing pipe 70, the blowing inlet of the blowing pipe 70 is connected to the outlet of the gas storage tank 20 via the pipeline blowing valve 30, and the blowing of the blowing pipe 70 is connected to the outlet of the gas storage tank 20. The blowing outlet is connected to the coal drop pipe 90 of the boiler, wherein an inlet valve 61 is installed at the feed port of the blowing tank 40, an outlet valve 62 is installed at the discharge port of the vertical rotary feeder 50, a tank gas pressure gauge 41 is installed on the blowing tank 40, a pipeline gas pressure gauge (not shown in the figure) is installed on the blowing pipe 70, an inflation valve 21 is installed on the blowing tank 40 and the inflation valve 21 is connected to the outlet of the gas storage tank 20, and a pressure relief valve 22 is also installed on the blowing tank 40.

[0010] like Figure 1 Preferably, the upper part of the blowing tank 40 is connected to the discharge port of the vertical rotary feeder 50 via a balancing pipe 60, wherein one end of the balancing pipe 60 is connected to the upper part of the blowing tank 40 and the other end is connected to the pipeline connecting the discharge port of the vertical rotary feeder 50 and the outlet valve 62.

[0011] In the present invention, the balance pipe 60 is a connecting pipe designed to balance the pressure at the outlet of the vertical rotary feeder 50 with the pressure within the spray tank 40, thereby allowing the carbon dust to fall from the spray tank 40 by its own weight into the vertical rotary feeder 50 and then into the spray pipe 70. Although the carbon dust particles are relatively hard and abrasive, this design greatly reduces the wear on the vertical rotary feeder 50 caused by the pressure difference between the spray tank 40 and the spray pipe 70.

[0012] In the present invention, the inlet valve 61 and the outlet valve 62 are preferably dome valves. The dome valves can ensure that the spray tank 40 is completely sealed and isolated from the outside during spraying, thereby preventing carbon dust from leaking, and such valves have the characteristics of long service life.

[0013] like Figure 1 The injection outlet of the injection pipe 70 is connected to the coal drop pipe 90 of the boiler via a spring hanger 80.

[0014] In the present invention, the spring hanger 80 is an existing component in the field. The spring hanger 80 is used to compensate for the thermal expansion caused by the temperature change of the coal drop pipe 90, and prevent the connection between the injection pipe 70 and the boiler coal drop pipe 90 from being damaged due to thermal expansion and contraction.

[0015] In the present invention, the inlet of the gas storage tank 20 is connected to an air source (not shown in the figure), and the gas storage tank 20 stores compressed air.

[0016] Preferably, in actual implementation, the spray tank 40 and the vertical rotary feeder 50 are placed on a weighing device (not shown in the figure). The weighing device adopts an existing electronic weighing device in the art and will not be described in detail here.

[0017] In the present invention, the vertical rotary feeder 50, pipeline injection valve 30, inlet valve 61, outlet valve 62, tank gas pressure gauge 41, pipeline gas pressure gauge, charging valve 21, pressure relief valve 22, and weighing device are connected to and controlled by a control system. The control system can be a PLC control system or a DCS control system. PLC and DCS control systems are well-known systems that can control the opening and closing and operating status of various devices and valves in the present invention, thereby achieving direct injection of carbon dust into the boiler combustion system, making the entire process fully automated.

[0018] In this utility model:

[0019] The carbon dust ash storage bin 10 is a storage device for storing carbon dust ash. In actual industrial production, the carbon dust ash can be transported into the carbon dust ash storage bin 10 for storage by pneumatic conveying or tank truck transportation.

[0020] The gas storage tank 20 is an energy storage device for storing compressed air. It usually has a pressure gauge and is used to fluidize the compressed air, charge the injection tank 40 and transport the injection gas to the injection pipeline 70.

[0021] The spray tank 40 and the vertical rotary feeder 50 are existing equipment in the industry. The spray tank 40 is a tank body with a larger upper portion and a smaller lower portion. The top opening of the spray tank 40 is equipped with an inlet valve 61 as a feed port, and the bottom opening is equipped with a vertical rotary feeder 50 as a discharge port.

[0022] The vertical rotary feeder 50 is the core device for achieving uniform injection. Carbon dust enters the vertical rotary feeder 50 through the injection tank 40. The vertical rotary feeder 50 rotates the incoming carbon dust and then delivers it to the injection pipeline 70. In practice, adjusting the rotational speed of the vertical rotary feeder 50 accurately adjusts the flow rate of the carbon dust from the injection pipeline 70 to the coal drop pipe 90, thereby achieving uniform injection of the carbon dust into the injection pipeline 70. Subsequently, under the control of the pipeline injection valve 30, the carbon dust is evenly injected into the boiler for recycling.

[0023] In practice, the vertical rotary feeder 50 may be, for example, a ceramic vertical rotary feeder disclosed in Chinese utility model patent No. ZL201620622572.8 and utility model name “ceramic vertical rotary feeder”. Of course, it is not limited thereto, and the vertical rotary feeder 50 may also be replaced by any device that can rotate and feed.

[0024] In actual design, the discharge port of the spray tank 40 is arranged adjacent to the feed port of the vertical rotary feeder 50 . In other words, the feed port of the vertical rotary feeder 50 is located below the discharge port of the spray tank 40 .

[0025] The injection pipe 70 is a conveying pipe for injecting carbon materials to remove dust. The injection pipe 70 should have corrosion resistance and wear resistance.

[0026] The pipeline blowing valve 30 is used to blow the carbon dust falling from the vertical rotary feeder 50 into the blowing pipe 70 using the compressed air sent from the air storage tank 20. In actual implementation, the switch and opening size of the pipeline blowing valve 30 can be adjusted to control the blowing force.

[0027] In the present invention, both the tank gas pressure gauge 41 and the pipeline gas pressure gauge can be existing pressure gauges. The pipeline spray valve 30, inlet valve 61, outlet valve 62, inflation valve 21, and pressure relief valve 22 are all existing electronically controlled valves. The pressure relief valve 22 can be connected to a dust removal and filtration device to prevent residual carbon dust from leaking out and contaminating the environment during the pressure relief process of the spray tank 40.

[0028] The working process of this utility model is:

[0029] During normal boiler operation, the operator sets the carbon dust injection flow rate into the coal drop pipe 90 based on the actual conditions of the boiler's combustion system and then initiates operation of the present invention. The pipeline injection valve 30 then opens, beginning the purge of the injection pipe 70. Simultaneously, the inlet valve 61 opens, allowing the carbon dust from the carbon dust storage bin 10 to fall into the injection tank 40. Once the injection tank 40 is fully loaded with carbon dust, the inlet valve 61 closes, and the air charging valve 21 opens, beginning to pressurize the injection tank 40. When the pressure within the injection tank 40 (measured by the tank gas pressure gauge 41) is no less than the pressure within the injection pipe 70 (measured by the pipeline gas pressure gauge), the outlet valve 62 opens, and the vertical rotary feeder 50 begins operation. The carbon dust is evenly fed into the injection pipe 70 through the vertical rotary feeder 50 and then, under the action of compressed air, is injected into the boiler's coal drop pipe 90 for recycling.

[0030] During the entire spraying process, the weight change of the carbon dust in the spraying tank 40 is continuously monitored by a weighing device, so as to adjust the rotation speed of the vertical rotary feeder 50 according to the set spraying flow rate to achieve uniform spraying.

[0031] When the carbon dust in the spray tank 40 reaches the low material level weight value (measured by a weighing device), the spray tank 40 is first depressurized and vented through the pressure relief valve 22, and then the carbon dust is loaded to wait for the spraying operation to continue.

[0032] In actual application, it is preferred that multiple blowing tanks 40 can be set next to the blowing pipe 70, with two or three blowing tanks 40 forming a group (not limited), and a vertical rotary feeder 50 is installed under each blowing tank 40. The groups of blowing tanks 40 are used to alternately operate to achieve continuous blowing of carbon materials to remove dust.

[0033] Specifically, when the outlet valve 62 below one group of spraying tanks 40 is opened and the spraying operation begins, the inlet valve 61 above another group of spraying tanks 40 is opened, and the carbon dust removal ash is loaded and pressurized, and when the pressure in the spraying tank 40 rises to the same level as the pressure in the spraying pipe 70, it enters a waiting state.

[0034] For the spraying tank 40 currently in operation, when the carbon dust reaches the low material level (measured by a weighing device), the vertical rotary feeder 50 below it begins to slow down and gradually stop. Meanwhile, the outlet valve 62 below the spraying tank 40 in the standby state opens, and the vertical rotary feeder 50 starts, increasing its speed and commencing the spraying operation. This allows the two groups of spraying tanks 40 to alternate, ensuring a constant flow rate of carbon dust within the spraying pipe 70. Furthermore, after the two groups of spraying tanks 40 have completed their alternating operation, while one group continues to spray, the other group begins to relieve pressure and exhaust through the pressure relief valve 22 in preparation for loading and pressurizing the carbon dust. This cycle continues. This alternating operation of the two groups of spraying tanks 40 ensures that the carbon dust is continuously, stably, and evenly sprayed into the boiler's coal drop pipe 90, allowing the carbon dust to enter the boiler along with the pulverized coal for combustion and recycling.

[0035] The advantages of the utility model are:

[0036] The utility model can recycle and reuse the carbon dust generated in the industrial production process by directly blowing it into the boiler for combustion. The whole blowing process has no secondary pollution problem, and solves the problem of carbon dust with large particle hardness and strong abrasiveness entering the vertical rotary feeder and causing wear, thereby extending the service life of the equipment. The whole system has high operating efficiency, is easy to implement and has low cost, and is suitable for promotion.

[0037] The above is a preferred embodiment of the present invention and the technical principles used therein. For those skilled in the art, any obvious changes such as equivalent transformations, simple replacements, etc. based on the technical solution of the present invention, without departing from the spirit and scope of the present invention, shall fall within the scope of protection of the present invention.

Claims

1. A carbon material dust removal boiler combustion recovery and utilization injection system, characterized in that: It includes a blowing tank, the feed port of the blowing tank is connected to the discharge port of the carbon dust ash storage bin, the discharge port of the blowing tank is installed with a vertical rotary feeder, the discharge port of the vertical rotary feeder is connected to the blowing pipe, the blowing inlet of the blowing pipe is connected to the outlet of the gas storage tank via a pipeline blowing valve, and the blowing outlet of the blowing pipe is connected to the coal drop pipe of the boiler, wherein, an inlet valve is installed at the feed port of the blowing tank, an outlet valve is installed at the discharge port of the vertical rotary feeder, a tank gas pressure gauge is installed on the blowing tank, a pipeline gas pressure gauge is installed on the blowing pipe, an inflation valve is installed on the blowing tank and the inflation valve is connected to the outlet of the gas storage tank, and a pressure relief valve is also installed on the blowing tank.

2. The carbon material dust removal ash boiler combustion recovery and utilization injection system according to claim 1 is characterized in that: The upper part of the blowing tank is connected to the discharge port of the vertical rotary feeder via a balancing pipe, wherein one pipe end of the balancing pipe is connected to the upper part of the blowing tank and the other pipe end is connected to the pipe connecting the discharge port of the vertical rotary feeder and the outlet valve.

3. The carbon material dust removal ash boiler combustion recovery and utilization injection system according to claim 1 is characterized in that: The inlet valve and the outlet valve are dome valves.

4. The carbon material dust removal ash boiler combustion recovery and utilization injection system according to claim 1 is characterized in that: The injection outlet of the injection pipe is connected to the coal drop pipe of the boiler via a spring hanger.

5. The carbon material dust removal ash boiler combustion recovery and utilization injection system according to claim 1 is characterized in that: The inlet of the gas storage tank is connected to an air source, and the gas storage tank stores compressed air.

6. The carbon material dust removal ash boiler combustion recovery and utilization injection system according to claim 1 is characterized in that: The spray tank and the vertical rotary feeder are placed on a weighing device.

7. The carbon material dust removal ash boiler combustion recovery and utilization injection system according to claim 6, characterized in that: The vertical rotary feeder, the pipeline blowing valve, the inlet valve, the outlet valve, the tank gas pressure gauge, the pipeline gas pressure gauge, the inflation valve, the pressure relief valve and the weighing device are connected to a control system.

8. The carbon material dust removal ash boiler combustion recovery and utilization injection system according to claim 7 is characterized in that: A plurality of the spraying tanks are arranged beside the spraying pipe, with two or three spraying tanks forming a group. The spraying tanks in each group are used to operate alternately to realize continuous spraying of carbon materials to remove dust.

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