A slag-tap boiler slag heat exchange and fiberization production coupling system

Abstract

The utility model relates to the field of energy and environmental protection technology, especially a kind of coupling system of slag boiler slag heat exchange and fiberization production is discharged to slag.The system includes conveying device, solid slag lifting device, liquid slag discharge boiler, slag well, fiber production line and heat exchanger.Conveying device is fed to boiler by solid slag lifting device, and the liquid slag produced by combustion enters heat exchanger slag conveying passage by slag well, slag conveying pipe, and then is sent to fiber production line;Dusty air of fiber production line returns to boiler by heat exchanger gas pipeline.In heat exchanger, liquid slag exchanges heat with dusty air, and solid slag is solidified on the surface of liquid slag, and dusty air is heated to assist combustion.The system realizes the collaborative coupling of inorganic fiber production and power plant boiler, without new waste gas, improves energy utilization, reduces transfer risk.

Description

Technical Field

[0001] This utility model relates to the field of energy and environmental protection technology, and in particular to a coupled system for heat exchange and fiber production of slag in slag-discharge boilers. Background Technology

[0002] Liquid ash discharge boilers are a type of boiler used in coal-fired power plants. They are characterized by refractory insulating castable lining around the combustion chamber, resulting in a high furnace volumetric heat load. After pulverized coal is injected into the furnace, it undergoes intense combustion and heat release, while its ash is melted into a liquid form and discharged through the ash discharge port. This type of boiler has the advantages of high combustion efficiency and low carbon content in fly ash. However, the discharge of the hot, liquid ash results in a significant loss of sensible heat, leading to energy waste.

[0003] Liquid slag can be used in the manufacture of inorganic fiber materials. However, the transportation of liquid slag in liquid form requires high heat resistance of the containers and poses significant safety risks. How to recover the heat of liquid slag without significantly increasing the transportation risks has become a bottleneck restricting the large-scale resource utilization of liquid slag. Utility Model Content

[0004] In view of this, the present invention provides a coupled system for heat exchange and fiber production of slag in slag discharge boilers. Therefore, the present invention provides the following technical solution: A coupled system for heat exchange and fiber production of slag from a slag-discharging boiler includes a conveying device, a solid slag lifting device, a liquid slag-discharging boiler, a slag well, a fiber production line, and a heat exchanger. The discharge end of the conveying device corresponds to the inlet end of the solid slag lifting device, and the discharge end of the solid slag lifting device corresponds to the inlet end of the liquid slag-discharging boiler. The slag well is located at the bottom of the liquid slag-discharging boiler, and the inlet end of the slag well corresponds to the discharge end of the liquid slag-discharging boiler. The discharge end of the slag well is connected to the inlet end of the slag conveying channel of the heat exchanger via a slag conveying pipe. The outlet end of the slag conveying channel is connected to the inlet end of the fiber production line. The air outlet of the fiber production line is connected to the inlet end of the gas pipeline of the heat exchanger via a pipe, and the outlet end of the gas pipeline of the heat exchanger is connected to the air inlet of the liquid slag-discharging boiler.

[0005] Furthermore, it also includes a second conveying device, wherein the outlet end of the slag conveying channel of the heat exchanger is connected to the inlet end of the second conveying device, and the outlet end of the second conveying device is connected to the feed end of the fiber production line.

[0006] Furthermore, an airflow regulating valve is installed on the pipeline between the fiber production line and the heat exchanger.

[0007] Furthermore, the heat exchanger is a mesh belt heat exchanger or a finned heat exchanger.

[0008] Furthermore, the conveying device is lined with a heat-resistant insulation layer.

[0009] Furthermore, the slag conveying pipe and the slag well are connected in a sealed manner.

[0010] Furthermore, the solid slag lifting device is a chain elevator or a spiral elevator.

[0011] Advantages and positive effects of this utility model: The conveying device transports the material to the inlet of the solid slag lifting device, which then transports the coal to the liquid slag boiler. After combustion, the coal flows into the slag well as liquid slag and enters the fiber production line through the slag conveying channel of the heat exchanger via the slag conveying pipe. The dust-laden air generated during the fiber production process enters the liquid slag boiler through the gas pipeline of the heat exchanger. In the heat exchanger, the liquid slag in the slag conveying channel has its heat absorbed by the dust-laden air in the gas pipeline. After cooling, the surface of the liquid slag first solidifies, thus forming a solid slag with a fixed shape. The dust-laden air in the gas pipeline absorbs the heat released by the liquid slag in the slag conveying channel, and the heated air enters the boiler as a combustion aid. This process does not produce new waste gas. A synergistic coupling mechanism can be built between the inorganic fiber production system and the power plant's liquid slag boiler, improving energy utilization efficiency and reducing transportation risks. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] Figure 1 This utility model provides a schematic diagram of a coupled system for heat exchange and fiber production of slag in a slag-discharging boiler.

[0014] In the diagram: 1. Liquid slag discharge boiler; 2. Slag well; 3. Fiber production line; 4. Heat exchanger; 5. First conveying device; 6. Solid slag lifting device; 7. Second conveying device. Detailed Implementation

[0015] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0016] This utility model provides a coupled system for heat exchange and fiber production of slag in slag discharge boilers, such as... Figure 1 As shown, the system includes a first conveying device 5, a second conveying device 7, a solid slag lifting device 6, a liquid slag discharge boiler 1, a slag well 2, a fiber production line 3, and a heat exchanger 4. The discharge end of the conveying device 5 corresponds to the inlet end of the solid slag lifting device 6, and the discharge end of the solid slag lifting device 6 corresponds to the inlet end of the liquid slag discharge boiler 1. The slag well 2 is located at the bottom of the liquid slag discharge boiler 1, and the inlet end of the slag well 2 corresponds to the discharge end of the liquid slag discharge boiler 1. The discharge end of the slag well 2 is connected to the inlet end of the slag conveying channel of the heat exchanger 4 through a slag conveying pipe. The outlet end of the slag conveying channel is connected to the inlet end of the second conveying device 7, and the outlet end of the second conveying device 7 is connected to the inlet end of the fiber production line 3. The air outlet of the fiber production line 3 is connected to the inlet end of the gas pipeline of the heat exchanger 4 through a pipe, and the outlet end of the gas pipeline of the heat exchanger 4 is connected to the air inlet of the liquid slag discharge boiler 1.

[0017] An airflow regulating valve is installed on the pipeline between fiber production line 3 and heat exchanger 4. Heat exchanger 4 is a mesh belt heat exchanger or a finned heat exchanger. The second conveying device 7 is lined with a heat-resistant insulation layer to reduce heat loss during transportation. The slag conveying pipe is sealed to the slag well 2. The solid slag lifting device 6 is a chain hoist or a screw hoist.

[0018] Working principle: Conveying device 5 transports the material to the inlet of solid slag lifting device 6. Solid slag lifting device 6 transports the coal to the liquid slag boiler. After combustion, the coal flows into the slag well 2 as liquid slag at a temperature of 1100-1300℃. It then enters the second conveying device 7 through the slag conveying pipe and the slag conveying channel of heat exchanger 4. After being transferred by the second conveying device 7, the coal enters the fiber production line 3 for production. The dust-laden air generated during the production process of fiber production line 3 enters the liquid slag furnace 1 through the gas pipeline of heat exchanger 4. In heat exchanger 4, the liquid slag in the slag conveying channel has its heat absorbed by the dust-laden air in the gas pipeline. After cooling, the liquid slag... Its surface solidifies first, thus forming a solid slag with a fixed shape. Its surface changes from red-hot and emitting visible light to gradually blackening and hardening. Its interior may still be in a hot liquid state, but because the surface solidifies first, it is still a solid form with a certain shape. The dust-laden air in the gas pipeline absorbs the heat released by the liquid slag in the slag conveying channel. The dust-laden air is heated to about 300°C and mixed with the hot air of the liquid slag discharge boiler 1 before entering the boiler as a combustion aid. At the same time, it prevents the blower of the liquid slag discharge boiler 1 from sending too much air into the boiler, reducing the nitrogen oxides produced by boiler combustion and reducing the load on the induced draft fan.

[0019] This process does not generate new waste gas. A synergistic coupling mechanism can be established between the inorganic fiber production system and the power plant's liquid slag boiler, improving energy utilization efficiency. Using heat exchanger 4 as a cooling element reduces the difficulty of transferring high-temperature liquid slag within the plant area. At the same time, the trace amounts of dust-laden air generated by fiber production line 3 are heated to high temperatures, which is equivalent to recovering the sensible heat of the high-temperature liquid slag 1, resulting in a strong energy-saving effect.

[0020] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A coupled system for heat exchange and fiber production of slag from a slag-discharging boiler, characterized in that, The system includes a first conveying device (5), a solid slag lifting device (6), a liquid slag boiler (1), a slag well (2), a fiber production line (3), and a heat exchanger (4). The discharge end of the first conveying device (5) corresponds to the inlet end of the solid slag lifting device (6), the discharge end of the solid slag lifting device (6) corresponds to the inlet end of the liquid slag boiler (1), the slag well (2) is located at the bottom of the liquid slag boiler (1), the inlet end of the slag well (2) corresponds to the discharge end of the liquid slag boiler (1), the discharge end of the slag well (2) is connected to the inlet end of the slag conveying channel of the heat exchanger (4) through a slag conveying pipe, the outlet end of the slag conveying channel is connected to the inlet end of the fiber production line (3), the air outlet of the fiber production line (3) is connected to the inlet end of the gas pipeline of the heat exchanger (4) through a pipeline, and the outlet end of the gas pipeline of the heat exchanger (4) is connected to the air inlet of the liquid slag boiler (1).

2. The coupled system for heat exchange and fiber production of slag in a slag-discharge boiler according to claim 1, characterized in that, It also includes a second conveying device (7), the outlet end of the slag conveying channel of the heat exchanger (4) is connected to the inlet end of the second conveying device (7), and the outlet end of the second conveying device (7) is connected to the feed end of the fiber production line (3).

3. The coupled system for heat exchange and fiber production of slag in a slag-discharge boiler according to claim 1, characterized in that, An air volume regulating valve is installed on the pipeline between the fiber production line (3) and the heat exchanger (4).

4. The coupled system for heat exchange and fiber production of slag in a slag-discharge boiler according to claim 1, characterized in that, The heat exchanger (4) is a mesh belt heat exchanger or a finned heat exchanger.

5. The coupled system for heat exchange and fiber production of slag in a slag-discharge boiler according to claim 2, characterized in that, The first conveying device (5) and the second conveying device (7) are both lined with heat-resistant insulation layers.

6. The coupled system for heat exchange and fiber production of slag in a slag-discharge boiler according to claim 1, characterized in that, The slag conveying pipe and the slag well (2) are sealed together.

7. The coupled system for heat exchange and fiber production of slag in a slag-discharge boiler according to claim 1, characterized in that, The solid slag lifting device (6) is a chain elevator or a spiral elevator.

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