A gasification furnace waste heat utilization system for burning quasi-eastern coal

Abstract

The utility model relates to the technical field of gasification furnace provides a kind of gasification furnace waste heat utilization system of burning Zhundong coal, and gasification furnace is used in cooperation, it include: separator, the inlet of the separator is communicated with the gas outlet of the gasification furnace, and the solid outlet of the separator is communicated with the inside of the gasification furnace;First flue and second flue, the inlet of the first flue is communicated with the gas outlet of the separator, and the inlet of the second flue is communicated with the outlet of the first flue;Third flue, the inlet of the third flue is communicated with the outlet of the second flue, and the inside of the third flue is provided with heat exchange mechanism.The utility model provides a kind of gasification furnace waste heat utilization system of burning Zhundong coal, and synthetic gas temperature does not appear coking and contamination when contacting with the heating surface of heat exchange mechanism.

Description

Technical Field

[0001] This utility model relates to the field of gasifier technology, specifically to a waste heat utilization system for a gasifier that burns Zhundong coal. Background Technology

[0002] Conventional gasifiers are adaptable to a wide range of coal types and have relatively low requirements for coal particle size, resulting in lower overall operating costs. The syngas temperature at the gasifier outlet is approximately 950 degrees Celsius. To effectively and maximize the utilization of the syngas waste heat, the high-temperature section of the waste heat boiler system after the high-efficiency separator adopts a fire-tube structure.

[0003] However, for gasifiers that burn Zhundong coal, due to the high alkali metal content in the syngas ash, coking and fouling occur when the syngas temperature is in the range of 600-900℃, causing blockage of the heat exchanger's heating surface. Therefore, the existing gasifier waste heat utilization system cannot meet the requirements for long-term stable operation. Utility Model Content

[0004] In view of the deficiencies in the existing technology, the purpose of this utility model is to provide a waste heat utilization system for a gasifier that burns Zhundong coal, in which the syngas temperature will not coke or become contaminated when it comes into contact with the heating surface of the heat exchange mechanism.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a waste heat utilization system for a gasifier burning Zhundong coal, used in conjunction with the gasifier, comprising: A separator, wherein the inlet of the separator is connected to the gas outlet of the gasifier, and the solid outlet of the separator is connected to the interior of the gasifier; A first flue and a second flue, wherein the inlet of the first flue is connected to the gas outlet of the separator, and the inlet of the second flue is connected to the outlet of the first flue. The third flue has an inlet connected to the outlet of the second flue, and a heat exchange mechanism is installed inside the third flue.

[0006] Furthermore, it also includes a dust collector, the inlet of which is connected to the outlet of the third flue, and the outlet of which is connected to the pipeline of the downstream process.

[0007] Furthermore, it also includes a circulating fan, the inlet of which is connected to the outlet of the dust collector, and the outlet of which is connected to the inlet of the third flue.

[0008] Furthermore, multiple vibrating devices are installed on the outer walls of both the first and second flues, and these vibrating devices are arranged at intervals along the longitudinal direction. The vibrating devices are used to vibrate the first or second flue.

[0009] Furthermore, both the first and second flues are equipped with settling ash hoppers at their bottoms.

[0010] Furthermore, the heat exchange mechanism includes a superheater, an evaporator, and an economizer, which are installed sequentially downwards along the longitudinal direction inside the third flue.

[0011] The beneficial effects of this utility model are as follows: This utility model provides a waste heat utilization system for a gasifier burning Zhundong coal. By utilizing the design concept of an empty flue, a first flue and a second flue are added, thereby reducing the temperature of the syngas when it enters the third flue. This slows down the coking and fouling of the heat exchange mechanism in the third flue. At the same time, the temperature regulation of the cold syngas brought by the circulating fan ensures that the temperature of the syngas entering the third flue is lower than the bonding temperature of alkali metals. Therefore, coking and fouling will not occur when the syngas comes into contact with the heated surface of the heat exchange mechanism. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of this utility model.

[0013] Figure reference numerals: 10-Gasifier, 11-Separator, 20-First flue, 30-Second flue, 40-Third flue, 41-Superheater, 42-Evaporator, 43-Economizer, 50-Dust collector, 60-Vibration device, 70-Settling ash hopper, 80-Circulating fan. Detailed Implementation

[0014] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0015] In this application, unless otherwise expressly specified and limited, the terms "connection" and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0016] In the description of this application, it should be understood that the terms "longitudinal", "horizontal", "level", "top", "bottom", "upper", "lower", "inner" and "outer", etc., indicate the orientation or positional relationship 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.

[0017] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly defined.

[0018] like Figure 1 As shown, this utility model provides a waste heat utilization system for a gasifier that burns Zhundong coal, which is used in conjunction with the gasifier 10 and includes a separator 11, a first flue 20, a second flue 30 and a third flue 40.

[0019] The inlet of separator 11 is connected to the gas outlet of gasifier 10, and the solid outlet of separator 11 is connected to the interior of gasifier 10.

[0020] The inlet of the first flue 20 is connected to the gas outlet of the separator 11, and the inlet of the second flue 30 is connected to the outlet of the first flue 20.

[0021] The inlet of the third flue 40 is connected to the outlet of the second flue 30, and a heat exchange mechanism is installed inside the third flue 40.

[0022] The specific working process of this system is as follows: First, the Zhundong coal is burned in the gasifier 10, and the syngas produced by the combustion enters the first flue 20 through the gas outlet of the gasifier.

[0023] Then, the synthesis gas in the first flue 20 enters the second flue 30 through the outlet of the first flue 20.

[0024] Next, the synthesis gas in the second flue 30 enters the third flue 40 through the outlet of the second flue 30, comes into contact with the heat exchange surface of the heat exchange mechanism in the third flue 40, and is then discharged.

[0025] This system adds a first flue 20 and a second flue 30 between the gasifier 10 and the heat exchange mechanism, thereby reducing the temperature of the syngas when it enters the third flue 40 to below 600°C. This slows down coking and fouling of the heat exchange mechanism in the third flue 40, so that coking and fouling will not occur when the syngas comes into contact with the heated surface of the heat exchange mechanism.

[0026] In one embodiment, a dust collector 50 is also included, the inlet of which is connected to the outlet of the third flue 40, and the outlet of which is connected to a pipeline of the downstream process.

[0027] After the syngas comes into contact with the heated surface of the heat exchange mechanism in the third flue 40, it enters the dust collector 50 for further dust removal before entering the downstream process.

[0028] In one embodiment, a circulating fan 80 is also included, the inlet of which is connected to the outlet of the dust collector 50, and the outlet of the circulating fan 80 is connected to the inlet of the third flue 40.

[0029] This design allows part of the syngas discharged from the dust collector 50 to enter the downstream process, while the other part returns to the third flue 40 via the circulating fan 80. This further controls the temperature of the syngas entering the third flue 40. By using the cooling syngas brought by the circulating fan to regulate the temperature, the temperature of the syngas entering the third flue 40 is ensured to be lower than the bonding temperature of alkali metals, thus avoiding coking and fouling on the heat exchanger surface.

[0030] In one embodiment, multiple vibrating devices 60 are installed on the outer walls of the first flue 20 and the second flue 30. The multiple vibrating devices 60 are arranged longitudinally at intervals. The vibrating devices 60 are used to vibrate the first flue 20 or the second flue 30 to better clean the inner walls of the first flue 20 and the second flue 30.

[0031] In one embodiment, both the bottom of the first flue 20 and the second flue 30 are equipped with settling ash hoppers 70, which can deposit some ash particles and reduce subsequent wear on the heat exchanger surface.

[0032] In one embodiment, the heat exchange mechanism includes a superheater 41, an evaporator 42, and an economizer 43, which are installed sequentially downwards along the longitudinal direction inside the third flue 40.

[0033] This system has the following effects: 1. By utilizing the design concept of an empty flue, a first flue 20 and a second flue 30 are added between the gasifier 10 and the heat exchange mechanism, thereby reducing the temperature of the syngas when it enters the third flue 40 to below 600℃. This slows down the coking and fouling of the heat exchange mechanism in the third flue 40, so that the syngas temperature will not coke or foul when it comes into contact with the heated surface of the heat exchange mechanism.

[0034] 2. By reducing the temperature of the syngas entering the third flue at 40°C, the problem of coking and fouling on the heat exchange surface of the heat exchange mechanism was solved.

[0035] 3. Settling ash hoppers 70 are installed at the bottom of both the first flue 20 and the second flue 30 to deposit some ash particles and reduce the wear on the heat exchange surface of the heat exchange mechanism.

[0036] 4. A portion of the syngas returns to the third flue 40 via the circulating fan 80. This further controls the temperature of the syngas entering the third flue 40, preventing coking and fouling on the heat exchanger surfaces.

[0037] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. It will be apparent to those skilled in the art that this utility model is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of this utility model is defined by the appended claims rather than the foregoing description, and thus all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this utility model.

[0038] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A waste heat recovery system for a gasifier burning Zhundong coal, used in conjunction with a gasifier, characterized in that: include: A separator, wherein the inlet of the separator is connected to the gas outlet of the gasifier, and the solid outlet of the separator is connected to the interior of the gasifier; A first flue and a second flue, wherein the inlet of the first flue is connected to the gas outlet of the separator, and the inlet of the second flue is connected to the outlet of the first flue; The third flue has an inlet connected to the outlet of the second flue, and a heat exchange mechanism is installed inside the third flue.

2. The waste heat utilization system for a gasifier burning Zhundong coal according to claim 1, characterized in that: It also includes a dust collector, the inlet of which is connected to the outlet of the third flue, and the outlet of which is connected to the pipeline of the downstream process.

3. The waste heat utilization system for a gasifier burning Zhundong coal according to claim 2, characterized in that: It also includes a circulating fan, the inlet of which is connected to the outlet of the dust collector, and the outlet of which is connected to the inlet of the third flue.

4. The waste heat utilization system for a gasifier burning Zhundong coal according to claim 1, characterized in that: Multiple vibrating devices are installed on the outer walls of both the first and second flues. The multiple vibrating devices are arranged at intervals along the longitudinal direction and are used to vibrate the first or second flue.

5. A waste heat utilization system for a gasifier burning Zhundong coal according to claim 4, characterized in that: Both the first and second flues are equipped with settling ash hoppers at their bottoms.

6. A waste heat utilization system for a gasifier burning Zhundong coal according to claim 1, characterized in that: The heat exchange mechanism includes a superheater, an evaporator, and an economizer, which are installed sequentially along the longitudinal direction inside the third flue.

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