A process system for co-firing treatment in a gasification slag pulverized coal boiler

Abstract

The present invention provides a process system for co-firing treatment in a gasification slag pulverized coal boiler. By adding a new layer of burners in the pulverized coal boiler for the combustion of gasification slag, the gasification slag layer burners burn the gasification slag, effectively solving the problem of gasification slag treatment. An oxygen supply system is provided at the front end of the gasification slag layer burners. By increasing the oxygen content of the primary air for transporting the gasification slag, the gasification slag burns in a relatively oxygen-rich atmosphere. The present invention provides a solution idea for the co-firing of gasification slag in a pulverized coal boiler, and plays a positive role in promoting the reduction, resource utilization and harmless treatment of gasification slag.

Description

Technical Field

[0001] The present invention relates to the technical field of combustion, and specifically to a process system for co-firing treatment in a gasified slag pulverized coal boiler. Background Art

[0002] With the development of the coal chemical industry, the gasified slag generated in the coal gasification process has become a new problem in solid waste treatment. At present, the gasified slag is basically landfilled in a slag yard. The large amount of accumulated gasification furnace slag not only occupies a large amount of land resources, pollutes the surrounding environment, but also easily causes soil pollution, water pollution and air pollution after long-term accumulation.

[0003] The gasified slag is divided into two categories: coarse slag and fine slag. The coarse slag is the fly ash particles remaining after the raw coal particles in the gasification furnace react with the gasifying agent at high temperature, forming molten slag on the furnace wall and flowing downward due to its own weight, and then forming solid slag after being quenched in the quench chamber; the fine slag is the fly ash particles generated after the synthesis gas produced by the gasification furnace undergoes purification processes such as washing and flashing. The gasified slag has characteristics such as low calorific value, high hardness, high moisture content, low volatile matter, large loss on ignition, and high ignition point. Summary of the Invention

[0004] Aiming at the problem that the gasified slag is difficult to handle in the prior art, the present invention provides a process system for co-firing treatment in a gasified slag pulverized coal boiler. This system burns the gasified slag by sending it into the high-temperature area of the boiler furnace by increasing the oxygen content in the primary air, which can solve the problem of difficult ignition of the gasified slag. Through the co-firing method, a large amount of gasified slag can be consumed every year, providing a new solution for the reduction, harmlessness and resource utilization of the gasified slag, which has positive practical significance.

[0005] The present invention is realized through the following technical solutions:

[0006] A process system for co-firing treatment in a gasified slag pulverized coal boiler, including a pulverized coal boiler, a burner, an oxygen supply system, a coal feeding system and a air supply system;

[0007] The burner includes a gasified slag layer burner and a pulverized coal layer burner; both the gasified slag layer burner and the pulverized coal layer burner are assembled in the furnace of the pulverized coal boiler;

[0008] The coal feeding system, the oxygen supply system and the air supply system are respectively arranged outside the furnace body of the pulverized coal boiler. The output end of the coal feeding system is connected to the gasified slag layer burner through a pulverized coal pipeline; the oxygen supply system is connected to the pulverized coal pipeline between the coal feeding system and the gasified slag layer burner to provide oxygen for the gasified slag layer burner; the output end of the air supply system is connected to the coal feeding system to realize the production of a wind-coal mixture in the coal feeding system.

[0009] Preferably, the gasified slag layer burner and the pulverized coal layer burner are arranged in layers in the furnace of the pulverized coal boiler.

[0010] Preferably, a perimeter air is provided on the gasified slag layer burner, and the wind speed of the perimeter air is greater than 25 m / s.

[0011] Preferably, the oxygen supply system includes an oxygen storage tank, and the oxygen storage tank is connected to the pulverized coal pipeline between the coal feeding system and the gasified slag layer burner through an oxygen supply pipe.

[0012] Furthermore, an oxygen amount regulating valve is provided on the oxygen supply pipe.

[0013] Preferably, the coal feeding system includes a coal bunker, a coal feeder, and a coal mill; the output port of the coal bunker faces the coal transportation input end of the coal feeder, the coal transportation output end of the coal feeder faces the coal mill, the coal mill is connected to the air supply system, and the output end of the coal mill is connected to the gasified slag layer burner through a pulverized coal pipeline.

[0014] Preferably, an air preheater is provided in the pulverized coal boiler for heating the air input into the coal feeding system.

[0015] Furthermore, the air supply system includes a primary air fan, and the air outlet of the primary air fan is connected into the air preheater to heat the air through the air preheater.

[0016] Compared with the prior art, the present invention has the following beneficial technical effects:

[0017] The present invention provides a process system for co-firing treatment in a gasified slag pulverized coal boiler. By adding a new layer of burner in the pulverized coal boiler for burning the gasified slag, the gasified slag layer burner burns the gasified slag, effectively solving the problem of gasified slag treatment. An oxygen supply system is provided at the front end of the gasified slag layer burner. By increasing the oxygen content of the primary air for transporting the gasified slag, the gasified slag burns in a relatively sufficient oxygen atmosphere. The present invention provides a solution idea for co-firing gasified slag in a pulverized coal boiler, and plays a positive role in promoting the reduction, resource utilization, and harmless treatment of gasified slag.

[0018] Furthermore, the gasified slag layer burner and the pulverized coal layer burner are arranged in layers in the furnace of the pulverized coal boiler, so that the fuel pulverized coal and gasified slag entering the pulverized coal boiler can be burned separately, avoiding mixed combustion and effectively improving the combustion efficiency.

[0019] Furthermore, a perimeter air is provided on the gasified slag layer burner, and the wind speed of the perimeter air is greater than 25 m / s, greatly enhancing the entrainment effect of the flue gas.

[0020] Furthermore, the oxygen supply system includes an oxygen storage tank, and the oxygen storage tank is connected to the pulverized coal pipeline between the coal feeding system and the gasified slag layer burner through an oxygen supply pipe. The oxygen storage tank can provide sufficient oxygen for the gasified slag layer burner, greatly improving the combustion of the gasified slag in the gasified slag layer burner.

[0021] Furthermore, an oxygen flow regulating valve is provided on the oxygen supply pipe, which can effectively regulate the oxygen output in the oxygen storage tank.

[0022] Further, the coal feeding system effectively replenishes the pulverized coal and gasification slag burned in the pulverized coal boiler.

[0023] Further, an air preheater is provided in the pulverized coal boiler to heat the air input into the coal feeding system, so that the fuel in the coal feeding system can be burned in the gasification slag layer burner after being subjected to high-temperature treatment.

[0024] Further, the air supply system includes a primary air fan. The air outlet of the primary air fan is connected to the air preheater, and the air is heated by the air preheater to effectively supply air to the pulverized coal boiler. Brief Description of the Drawings

[0025] Figure 1 It is a schematic structural diagram of the process system for co-firing treatment in a gasification slag pulverized coal boiler of the present invention.

[0026] In the figure: 1 - pulverized coal boiler; 2 - gasification slag layer burner; 3 - pulverized coal layer burner; 4 - coal bunker; 5 - coal feeder; 6 - coal mill; 7 - oxygen storage tank; 8 - oxygen flow regulating valve; 9 - primary air fan. Detailed Description of the Preferred Embodiment

[0027] In order to enable those skilled in the art to better understand the solution of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0028] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion.

[0029] The present invention will be further described in detail below with reference to the accompanying drawings:

[0030] See Figure 1, in an embodiment of the present invention, a process system for co-firing treatment in a gasification slag pulverized coal boiler is provided. This system solves the problem of difficult combustion of gasification slag by sending the gasification slag into the high-temperature area of the boiler furnace through increasing the oxygen content in the primary air for combustion. Through the co-firing method, a large amount of gasification slag can be consumed annually, providing a new solution for the reduction, harmless treatment, and resource utilization of gasification slag, which has positive practical significance.

[0031] Specifically, the system includes a pulverized coal boiler 1, a burner, an oxygen supply system, a coal feeding system, and a air supply system;

[0032] The burner includes a gasification slag layer burner 2 and a pulverized coal layer burner 3; both the gasification slag layer burner 2 and the pulverized coal layer burner 3 are assembled in the furnace of the pulverized coal boiler 1;

[0033] The coal feeding system, the oxygen supply system, and the air supply system are respectively arranged outside the furnace body of the pulverized coal boiler 1. The output end of the coal feeding system is connected to the gasification slag layer burner 2 through a pulverized coal pipeline; the oxygen supply system is connected to the pulverized coal pipeline between the coal feeding system and the gasification slag layer burner 2 to provide oxygen for the gasification slag layer burner 2; the output end of the air supply system is connected to the coal feeding system to realize the production of a wind-coal mixture in the coal feeding system.

[0034] Specifically, the gasification slag layer burner 2 and the pulverized coal layer burner 3 are arranged in layers in the furnace of the pulverized coal boiler 1. The layered arrangement can separate the fuel pulverized coal and gasification slag entering the pulverized coal boiler for combustion, avoiding mixed combustion and effectively improving the combustion efficiency.

[0035] Specifically, the gasification slag layer burner 2 is provided with a perimeter air, and the wind speed of the perimeter air is greater than 25 m / s, greatly enhancing the entrainment effect of the flue gas.

[0036] Specifically, the oxygen supply system includes an oxygen storage tank 7. The oxygen storage tank 7 is connected to the pulverized coal pipeline between the coal feeding system and the gasification slag layer burner 2 through an oxygen supply pipe. The oxygen storage tank 7 can provide sufficient oxygen for the gasification slag layer burner 2, greatly improving the combustion of the gasification slag in the gasification slag layer burner 2.

[0037] Among them, an oxygen amount regulating valve 8 is arranged on the oxygen supply pipe, which can effectively regulate the oxygen output in the oxygen storage tank.

[0038] Specifically, the coal feeding system includes a coal bunker 4, a coal feeder 5, and a coal mill 6; the output port of the coal bunker 4 faces the coal transportation input end of the coal feeder 5, the coal transportation output end of the coal feeder 5 faces the coal mill 6, the coal mill 6 is connected to the air supply system, and the output end of the coal mill 6 is connected to the gasification slag layer burner 2 through a pulverized coal pipeline. The coal feeding system effectively replenishes the fuel pulverized coal and gasification slag burned in the pulverized coal boiler.

[0039] Specifically, an air preheater is provided in the pulverized coal boiler 1 for heating the air input into the coal feeding system, so that the fuel in the coal feeding system can be combusted in the gasification slag layer burner after high-temperature treatment.

[0040] Specifically, the air supply system includes a primary air fan 9. The air outlet of the primary air fan 9 is connected to the air preheater, and the air is heated through the air preheater, effectively supplying air to the pulverized coal boiler.

[0041] Specifically, the present invention uses the waste residue (i.e., gasification slag) generated in the chemical gasification process as fuel for co-firing to achieve harmless and resourceful treatment of the gasification slag. After the gasification slag generated in the chemical gasification process is ground by the coal mill 6 to meet the particle size requirements, it is sent into the burner through the primary air and then enters the boiler for combustion; based on the characteristics of the difficult-to-burn gasification slag, a stream of oxygen is introduced into the primary air to increase the oxygen content in the primary air; at the same time, the wind speed of the perimeter air is increased to enhance the entrainment effect of the gasification slag particles in the furnace flow field.

[0042] When the process system for co-firing treatment in a gasification slag pulverized coal boiler of the present invention is in use, the coal in the coal bunker 4 is transported to the coal mill 6 by the coal feeder 5 for grinding. The primary air fan 9 provides the air source, which is heated through the air preheater in the pulverized coal boiler 1 and flows to the coal mill 6 through the air supply pipeline. After the particle size of the coal meets the requirements, a coal-air mixture is formed in the coal mill 6 by the primary air from the air preheater. The coal-air mixture flows into the gasification slag layer burner 2 of the pulverized coal boiler 1 through the pulverized coal pipeline for the combustion of the gasification slag; the oxygen storage tank 7 controls the oxygen content entering the gasification slag layer burner 2 through the oxygen flow regulating valve 8, so that the gasification slag can be fully combusted under the condition of sufficient oxygen.

[0043] In summary, the present invention provides a process system for co-firing treatment in a gasification slag pulverized coal boiler. By adding a new layer of burner in the pulverized coal boiler for the combustion of the gasification slag, the gasification slag layer burner burns the gasification slag, effectively solving the problem of gasification slag treatment. An oxygen supply system is provided at the front end of the gasification slag layer burner. By increasing the oxygen content in the primary air for transporting the gasification slag, the gasification slag can be combusted in an atmosphere of relatively sufficient oxygen. The present invention provides a solution idea for the co-firing of gasification slag in a pulverized coal boiler, and has a positive promoting effect on the reduction, resource utilization and harmless treatment of gasification slag.

[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: the specific implementation manners of the present invention can still be modified or equivalently replaced, and any modification or equivalent replacement that does not deviate from the spirit and scope of the present invention should be covered within the protection scope of the claims of the present invention.

Claims

1. A process system for co-firing treatment in a gasification slag pulverized coal boiler, characterized in that, It includes a pulverized coal boiler (1), a burner, an oxygen supply system, a coal feeding system and a air supply system; The burner includes a gasification slag layer burner (2) and a pulverized coal layer burner (3); the gasification slag layer burner (2) and the pulverized coal layer burner (3) are both assembled in the furnace of the pulverized coal boiler (1); The coal feeding system, the oxygen supply system and the air supply system are respectively arranged outside the furnace body of the pulverized coal boiler (1). The output end of the coal feeding system is connected to the gasification slag layer burner (2) through a pulverized coal pipeline; the oxygen supply system is connected to the pulverized coal pipeline between the coal feeding system and the gasification slag layer burner (2) to supply oxygen to the gasification slag layer burner (2); the output end of the air supply system is connected to the coal feeding system to produce a wind-coal mixture in the coal feeding system; The oxygen supply system includes an oxygen storage tank (7), and the oxygen storage tank (7) is connected to the pulverized coal pipeline between the coal feeding system and the gasification slag layer burner (2) through an oxygen supply pipe; The gasification slag layer burner (2) and the pulverized coal layer burner (3) are arranged in layers in the furnace of the pulverized coal boiler (1); The gasification slag layer burner (2) is provided with a perimeter air, and the wind speed of the perimeter air is greater than 25 m / s; An air preheater is arranged in the pulverized coal boiler (1) to heat the air input into the coal feeding system; The air supply system includes a primary air fan (9), and the air outlet of the primary air fan (9) is connected to the air preheater to heat the air through the air preheater.

2. The process system for co-firing treatment in a gasification slag pulverized coal boiler according to claim 1, wherein, An oxygen flow regulating valve (8) is arranged on the oxygen supply pipe.

3. The process system for co-firing treatment in a gasification slag pulverized coal boiler according to claim 1, characterized in that, The coal feeding system includes a coal bunker (4), a coal feeder (5) and a coal mill (6); the output port of the coal bunker (4) faces the coal transportation input end of the coal feeder (5), the coal transportation output end of the coal feeder (5) faces the coal mill (6), the coal mill (6) is connected to the air supply system, and the output end of the coal mill (6) is connected to the gasification slag layer burner (2) through a pulverized coal pipeline.

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