Air supply system for gasification device

Abstract

The utility model discloses an air supply system for a gasification device, which belongs to the technical field of coal chemical industry and comprises a preheater connected with a first water vapor pipeline. A first connector of the gasifying agent mixer is connected with the second water vapor pipeline, and a second connector of the gasifying agent mixer is connected with the preheater through a first connecting pipe; a first pneumatic control valve is arranged on the second water vapor pipeline; the gasification unit is connected with the gasification agent mixer, so that the gasification agent entering the gasification unit is subjected to gasification reaction; and the deslagging unit is connected with the gasification unit so as to convey slag in the gasification unit out of the gasification unit. According to the utility model, the air distribution uniformity in the gasification reaction system and the deslagging system are smoothly combined together, so that the gasification reaction efficiency is improved, and the stable operation period of the gasification device is prolonged.

Description

Technical Field

[0001] This utility model belongs to the field of coal chemical technology, and particularly relates to the field of circulating fluidized bed gasification technology, specifically to an air supply system for a gasification device. Background Technology

[0002] Coal gasification is a core technology for the clean and efficient conversion and utilization of coal, and it forms the basis for processes such as the production of industrial fuel gas, natural gas, IGCC power generation, synthetic ammonia, methanol, coal-based chemicals, and coal-based polygeneration. Currently, fluidized bed gasification boasts strong adaptability to various coal types, low oxygen consumption and coal preparation costs, and low investment, making it suitable for fuel gas production. The market share of circulating fluidized bed gasifiers in coal gasification is increasing. A gasification system consists of three main components: a feeding system, a gasification reaction system, and an ash removal system. The air distribution device exists within the gasification reaction system and is integrated with the ash removal system, making its role crucial. However, the design of existing air distribution devices is unreasonable, leading to difficulties in ash removal and a high likelihood of coking in the gasifier. Utility Model Content

[0003] To solve the above problems, the present invention adopts the following technical solution:

[0004] An air supply system for a gasification device, comprising:

[0005] A preheater, which is connected to a first steam pipeline;

[0006] A vaporizing agent mixer, wherein the first port of the vaporizing agent mixer is connected to a second steam pipeline, and the second port is connected to a preheater through a first connecting pipe; a first pneumatic regulating valve is provided on the second steam pipeline;

[0007] A gasification unit, which is connected to the gasifying agent mixer, so that the gasifying agent entering the gasification unit undergoes a gasification reaction;

[0008] A slag discharge unit is connected to the gasification unit to transport the slag in the gasification unit to the outside of the gasification unit.

[0009] Furthermore, the gasification unit includes a gasifier, an air cap, an annular pipe, and a gasifying agent inlet nozzle; a gasifier air chamber is provided at the bottom of the gasifier; the gasifier air chamber is connected to the gasifier through the air cap; the annular pipe is sleeved outside the gasifier air chamber and connected to the gasifying agent inlet nozzle provided inside the gasifier air chamber.

[0010] Furthermore, the slag discharge unit includes a screw conveyor, a slag conveying pipe, a slag cooler, and an ash storage silo; the slag conveying pipe is located at the bottom of the gasifier and corresponds to the inlet of the screw conveyor, so that the slag generated in the gasifier enters the screw conveyor; the two ash storage silos are arranged vertically and interconnected; the upper ash storage silo corresponds to the outlet of the screw conveyor; and the lower ash storage silo corresponds to the slag cooler.

[0011] Furthermore, the preheater is connected to the oxygen enrichment preparation device via a second connecting pipe to supply oxygen into the preheater; a second pneumatic regulating valve is provided on the second connecting pipe.

[0012] Furthermore, it also includes a gasification fan; the gasification fan is connected to the preheater via a third connecting pipe to supply air into the preheater.

[0013] Furthermore, a third pneumatic regulating valve is provided on the first connecting pipe.

[0014] Beneficial effects:

[0015] This utility model provides an air supply system for a gasification device, which combines a gasifier with a uniformly distributed air distribution system and a slag discharge unit in the gasification reaction system. Through the reasonable arrangement of the air distribution position and the slag discharge position in the gasifier, the slag can be discharged smoothly in the positive pressure furnace, reducing coking, improving the thermal efficiency of the gasifier, and extending the stable operation cycle of the gasification device. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the air supply system of the present invention used in a gasification device;

[0017] The components include: 1. First pneumatic regulating valve; 2. Second pneumatic regulating valve; 3. Preheater; 4. Third pneumatic regulating valve; 5. Gasifying agent mixer; 6. Gasifier; 7. Annular pipe; 8. Gasifying agent nozzle for furnace inlet; 9. Gasifier bottom; 10. Screw conveyor; 11. Ash storage bin; 12. Slag cooler; 13. Gasifier air chamber; 14. Air cap. Detailed Implementation

[0018] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0019] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "horizontal," "inner," "outer," and "one side," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model; the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In addition, unless otherwise explicitly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly, for example, they can be fixed connections, detachable connections, or integral connections; they can be mechanical connections or electrical connections; they can be direct connections or indirect connections through an intermediate medium; they can be internal connections between two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0020] Example 1

[0021] like Figure 1 As shown, an air supply system for a gasification device includes:

[0022] Preheater 3 is connected to the first steam pipeline;

[0023] The gasifying agent mixer 5 has a first interface connected to a second steam pipeline, and the second interface is connected to the preheater 3 through a first connecting pipe; a first pneumatic regulating valve 1 is installed on the second steam pipeline.

[0024] The first and second steam pipelines increase the calorific value of the gasified fuel by heating the air (oxygen) at the furnace entrance temperature.

[0025] A gasification unit is connected to a gasifying agent mixer 5 to cause the gasifying agent entering the gasification unit to undergo a gasification reaction.

[0026] Among them, the gasifying agent mixer 5 is added to ensure the uniformity of the gasifying agent entering the furnace and reduce the fluctuation of the gasification reaction.

[0027] The slag discharge unit is connected to the gasification unit to transport the slag from the gasification unit to the outside of the gasification unit.

[0028] In this embodiment, the gasification unit includes a gasifier 6, an air cap 14, an annular pipe 7, and a gasifying agent nozzle 8. A gasifier air chamber 13 is provided at the bottom of the gasifier 6. The gasifier air chamber 13 is connected to the gasifier 6 through the air cap 14. The annular pipe 7 is sleeved outside the gasifier air chamber 13 and connected to the gasifying agent nozzle 8 provided inside the gasifier air chamber 13.

[0029] In this embodiment, the slag discharge unit includes a gasifier bottom 9, a slag conveying pipe, a slag cooler 12, and an ash storage bin 11. The slag conveying pipe is located at the bottom of the gasifier and is correspondingly arranged to the inlet of the spiral slag conveyor so that the slag generated in the gasifier 6 enters the gasifier bottom 9. The two ash storage bins 11 are arranged vertically and connected to each other. The upper ash storage bin 11 is connected to the outlet of the gasifier bottom 9, and the lower ash storage bin 11 is connected to the slag cooler 12.

[0030] The above technical solution, with its spiral slag conveyor and two-stage ash storage bins 11, can prevent the combustion gas from being ejected during the slag discharge process.

[0031] In this embodiment, the preheater 3 is connected to the oxygen enrichment preparation device through a second connecting pipe to supply oxygen into the preheater 3; a second pneumatic regulating valve 2 is provided on the second connecting pipe.

[0032] In this embodiment, a gasification fan is also included; the gasification fan is connected to the preheater 3 via a third connecting pipe to supply air into the preheater.

[0033] In this embodiment, a third pneumatic regulating valve 4 is provided on the first connecting pipe.

[0034] Through the above technical solution, the gasifying agent (air, oxygen and water vapor) is controlled by an automatic regulating valve. According to the load and operating temperature in the gasifier, the opening of the first pneumatic regulating valve 1, the second pneumatic regulating valve 2 and the third pneumatic regulating valve 4 are automatically adjusted to realize the automation of the air supply system of the fluidized bed gasifier.

[0035] The working process of the air supply system for a gasification device provided by this utility model is as follows:

[0036] One source of low-pressure steam enters the gasifying agent mixer 5 through the pneumatic regulating valve 1, while the other enters the preheater 3 to heat the air (oxygen). The oxygen enters the preheater 3 through the regulating valve 2 and is heated by the steam. The preheated air (oxygen) then enters the gasifying agent mixer 5 through the pneumatic regulating valve 4. The uniformly mixed gasifying agent enters the gasifying agent nozzle 8 through the annular pipe 7 around the gasifier. The gasifying agent is then fully mixed in the gasifier air chamber 13 and enters the gasifier 6 through the air cap 14 arranged on the bottom of the gasifier 9. It reacts with the fuel in the gasifier 6 to undergo a gasification reaction. The generated fuel gas flows upward and exits the gasifier 6. The large slag produced by the gasification reaction enters the two-stage ash storage bin 11 through the screw conveyor 10. Depending on the operating conditions, the large slag is sent to the slag cooler 12 for further cooling and discharge.

[0037] Among them, the gasifying agent nozzle 8 and the bottom of the gasifier 9 are at a sufficient height to ensure that the gasifier air chamber 13 always maintains a uniform pressure, so that the gasifier maintains uniform air distribution, reduces the carbon content of the slag in the gasifier 6, and improves the gasification thermal efficiency.

[0038] The amount of gasifying agent fed into the furnace is automatically adjusted by the gasification regulating valve 1, which reduces the fluctuation of the gasification reaction in the gasifier 6 and improves the stability of the gasified fuel gas.

[0039] The air (oxygen) entering the furnace is heated by water vapor in the preheater 3, which increases the temperature of the gasifying agent entering the furnace and increases the calorific value of the gas produced in the gasifier 6.

[0040] The gasifying agent (air, oxygen, and water vapor) enters the gasifying agent mixer 5 to ensure uniform mixing and maintain the same temperature before entering the gasifier 6, thereby reducing fluctuations in the gasification reaction.

[0041] The above are merely preferred embodiments of the present utility model and do not constitute any limitation on the technical scope of the present utility model. Therefore, any minor modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model shall still fall within the scope of the technical solution of the present utility model.

Claims

1. An air supply system for a gasification plant, characterized in that The application relates to a gasification device for a gasification unit, which comprises the following parts: a preheater connected with a first water vapor pipeline; a gasification agent mixer, the first interface of which is connected with a second water vapor pipeline, and the second interface is connected with the preheater through a first connecting pipeline; a first pneumatic regulating valve is arranged on the second water vapor pipeline; a gasification unit, which is connected with the gasification agent mixer to make the gasification agent entering the gasification unit to have a gasification reaction; a slag discharging unit, which is connected with the gasification unit to transport the slag in the gasification unit to outside of the gasification unit.

2. The air supply system for a gasification device according to claim 1, characterized in that, The gasification unit comprises a gasification furnace, a wind cap, an annular pipeline and a furnace-entering gasification agent nozzle; the bottom of the gasification furnace is provided with a gasification furnace air chamber; the gasification furnace air chamber is communicated with the gasification furnace through the wind cap; the annular pipeline is sleeved outside the gasification furnace air chamber and is connected with the furnace-entering gasification agent nozzle arranged in the gasification furnace air chamber.

3. The air supply system for a gasification device according to claim 2, wherein The slag discharging unit comprises a spiral slag conveying machine, a slag conveying pipeline, a slag cooling machine and a slag storage bin; the slag conveying pipeline is arranged at the bottom of the gasification furnace and is correspondingly arranged with the inlet of the spiral slag conveying machine, so that the slag generated in the gasification furnace enters the spiral slag conveying machine; two slag storage bins are arranged above and below and are communicated with each other; the upper slag storage bin is correspondingly arranged with the outlet of the spiral slag conveying machine; the lower slag storage bin is correspondingly arranged with the slag cooling machine.

4. The air supply system for a gasification device according to claim 3, wherein The preheater is connected with an oxygen-rich preparation device through a second connecting pipeline to provide oxygen into the preheater; a second pneumatic regulating valve is arranged on the second connecting pipeline.

5. The air supply system for a gasification device according to claim 1, wherein A gasification air blower is further arranged; the gasification air blower is connected with the preheater through a third connecting pipeline to provide air into the preheater.

6. The air supply system for a gasification device according to claim 1, wherein A third pneumatic regulating valve is arranged on the first connecting pipeline.

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