Lignite dry distillation upgrading system

Abstract

The utility model provides a lignite dry distillation upgrading system. The lignite dry distillation upgrading system comprises a first conveying line and a second conveying line, a first temperature control system is arranged in the first fluidized bed furnace and used for setting the working temperature of the first fluidized bed furnace, providing a high-temperature heat source and removing water outside lignite; the second conveying line is used for conveying the lignite from which the external water is removed; the dry distillation furnace is used for pyrolyzing the lignite without the external water and removing the water in the lignite; a temperature control system II is arranged in the second fluidized bed furnace and is used for setting the working temperature of the dry distillation furnace; the interior of the dry distillation furnace is in a vacuum state; according to the utility model, water outside the lignite is removed by using the first fluidized bed furnace, water inside the lignite is removed by using the dry distillation furnace with the vacuum inside, and the quality of the lignite is obviously improved and the energy consumption is reduced by accurately controlling the removal temperature and the treatment environment of the outer water and the inner water.

Description

Technical Field

[0001] This utility model relates to the field of lignite purification technology, and in particular to a lignite dry distillation and upgrading system and its upgrading process. Background Technology

[0002] Lignite, an important fossil fuel, is widely distributed globally, particularly in China, where its reserves are abundant, accounting for approximately 60% of the world's total. However, lignite is generally of low quality, containing high levels of moisture and impurities, which not only reduces its combustion efficiency but also increases transportation and storage costs. Therefore, upgrading lignite to remove moisture and impurities, thereby improving its calorific value and utilization efficiency, is of significant economic and environmental importance.

[0003] The moisture in lignite is mainly divided into external water and internal water. External water is relatively easy to remove, while internal water is more difficult to remove. Traditional lignite upgrading methods often fail to effectively remove internal water, resulting in poor upgrading effects.

[0004] Existing technological defects

[0005] Incomplete removal of external water: Traditional methods often use low temperatures in the external water removal stage, resulting in incomplete removal of external water and affecting the subsequent internal water removal and quality improvement effects.

[0006] Difficulty in removing internal water: Due to the complexity of the internal structure of lignite, internal water is difficult to remove effectively by conventional methods, resulting in limited improvement in the calorific value of upgraded lignite.

[0007] High energy consumption and significant pollution: Some quality improvement methods consume a lot of energy during the process and are prone to generating harmful gases and wastewater, causing environmental pollution.

[0008] Lack of systematicness and automation: Traditional quality improvement methods often lack systematicness and automation, resulting in complex operations and low efficiency.

[0009] Therefore, a lignite dry distillation upgrading system and its upgrading process are proposed. Utility Model Content

[0010] In view of this, the present invention aims to provide a lignite dry distillation and upgrading system and its upgrading process to solve or alleviate the technical problems existing in the prior art, and at least provide a beneficial alternative.

[0011] The technical solution of this utility model embodiment is implemented as follows:

[0012] In a first aspect, this utility model provides a lignite dry distillation and upgrading system, comprising:

[0013] The first transport route is used to transport lignite;

[0014] The first boiling furnace is equipped with a temperature control system to set the working temperature of the first boiling furnace, provide a high-temperature heat source, and remove water from the lignite.

[0015] The second conveying route is used to transport lignite after external water removal;

[0016] A dry distillation furnace is used to pyrolyze lignite after the external water has been removed, and to remove the internal water from the lignite.

[0017] The second boiling furnace is equipped with a temperature control system II, which is used to set the working temperature of the dry distillation furnace.

[0018] The dry distillation furnace is in a vacuum state.

[0019] In some embodiments, it also includes:

[0020] The feeding silo is used to transport lignite into the first conveying route;

[0021] Finished product silos are used to store upgraded, high-quality coal.

[0022] In some embodiments, it also includes:

[0023] The first cyclone dust collector is used to remove dust particles from the flue gas during the operation of the first fluidized bed furnace.

[0024] Spray towers are used for desulfurization and dust removal, while also removing dust particles from flue gas.

[0025] In some embodiments, the flue gas exhaust pipe of the dry distillation furnace is connected to the spray tower via a carbonization furnace tail gas fan.

[0026] In some embodiments, the outlet pipe of the first cyclone dust collector is connected to the inlet pipe of the spray tower via an exhaust fan.

[0027] In some embodiments, a second cyclone dust collector is also included for removing dust particles from the flue gas during the operation of the distillation furnace, and the outlet pipe of the second cyclone dust collector is connected to the second fluidized bed furnace via a gas induced draft fan.

[0028] Secondly, this utility model also provides a lignite dry distillation and upgrading process, including the following steps:

[0029] S1. Use a loose separation method to remove impurities from lignite;

[0030] S2. The lignite is transported to the first fluidized bed furnace via the first conveying route, and the working temperature inside the first fluidized bed furnace is set by the temperature control system. The working temperature inside the first fluidized bed furnace is 350-550℃, and the working time is 20-30 minutes. After removing the external water from the lignite in an aerobic environment, the process proceeds to the next step.

[0031] S3. The lignite after removing external water is conveyed into the dry distillation furnace through the second conveying route, and the working temperature inside the dry distillation furnace is set by the temperature control system in the second fluidized bed furnace. The working temperature inside the dry distillation furnace is 280-300℃, and the working time is 20-30 minutes to remove internal water from the lignite in an anaerobic environment.

[0032] S4. Cooling yields high-quality coal, which is then stored in the finished product silo.

[0033] In some embodiments, it also includes:

[0034] The flue gas generated during the removal of external and internal water from lignite is purified by a first cyclone dust collector, a second cyclone dust collector, and a spray tower.

[0035] The present invention has the following advantages due to the adoption of the above technical solution:

[0036] This invention removes external water from lignite using a first fluidized bed furnace and internal water from lignite using an internal vacuum distillation furnace. By precisely controlling the removal temperature of external and internal water as well as the treatment environment, it achieves a significant improvement in lignite quality and a reduction in energy consumption.

[0037] The above overview is for illustrative purposes only and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features of the present invention will become readily apparent from the accompanying drawings and the following detailed description. Attached Figure Description

[0038] To more clearly illustrate the technical solutions in the embodiments of this application 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 only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0039] Figure 1 This is a system module diagram of the present invention. Detailed Implementation

[0040] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of this invention. Therefore, the drawings and description are considered exemplary in nature and not restrictive.

[0041] It is important to note that terms such as "first," "second," "symmetric," and "array" are used only to distinguish between descriptive and positional descriptions and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, features specified with terms such as "first" or "symmetric" may explicitly or implicitly include one or more of that feature; similarly, when the quantity of certain features is not limited by words such as "two" or "three," it should be noted that such features also explicitly or implicitly include one or more features.

[0042] In this utility model, unless otherwise explicitly specified and limited, terms such as "installation," "connection," and "fixation" should be interpreted broadly; for example, they can refer to a fixed connection, a detachable connection, or an integral molding; they can refer to a mechanical connection, a direct connection, a welding 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 based on the accompanying drawings and specific circumstances.

[0043] Example 1

[0044] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0045] like Figure 1 As shown, this utility model embodiment provides a lignite dry distillation and upgrading system, comprising:

[0046] First conveying route 2 is used to transport lignite;

[0047] The first boiling furnace 3 is equipped with a temperature control system 1, which is used to set the working temperature of the first boiling furnace 3, provide a high-temperature heat source, and remove the external water from the lignite;

[0048] The second conveying route 8 is used to convey lignite after external water removal;

[0049] Dry distillation furnace 13 is used for pyrolysis of lignite after external water removal, and for removing internal water from lignite;

[0050] The second boiling furnace 12 is equipped with a temperature control system 2, which is used to set the working temperature of the dry distillation furnace 13.

[0051] The interior of the dry distillation furnace 13 is under vacuum;

[0052] By adopting the above technical solution and precisely controlling the working temperature through a temperature control system, a high-temperature heat source environment is provided for lignite. This step effectively removes the external moisture from the surface of the lignite, laying the foundation for subsequent processing. Further processing in the dry distillation furnace 13: After removing the external moisture, the lignite enters the dry distillation furnace via the second conveying route 8 for further pyrolysis at high temperatures to remove internal moisture. This step-by-step processing ensures complete moisture removal and improves the lignite's upgrading efficiency.

[0053] The first boiling furnace 3 and the second boiling furnace 12 are respectively equipped with temperature control system one and temperature control system two, which can accurately set and control the working temperature, ensuring the stability and consistency of the processing, and avoiding poor quality improvement due to temperature fluctuations.

[0054] Both temperature control system one and temperature control system two include:

[0055] Temperature sensor: Installed at the outlet of the flue gas desulfurization tower and inside the furnace of the fluidized bed furnace, it is used to monitor the furnace temperature in real time.

[0056] Pressure transmitter: Installed in locations such as the blower box, it is used to monitor the pressure inside the furnace.

[0057] Controller: Receives signals from temperature sensors and pressure transmitters, and processes this data to control actuators such as coal feeders and blowers.

[0058] Actuators: including coal feeders, blowers, return air dampers, and induced draft fans, adjust operating parameters according to the controller's instructions to affect the temperature and pressure inside the furnace.

[0059] In this embodiment, specifically: it also includes:

[0060] Feeding silo 1 is used to transport lignite into the first conveying route 2;

[0061] Finished product silo 15 is used to store upgraded high-quality coal.

[0062] In this embodiment, specifically: it also includes:

[0063] The first cyclone dust collector 7 is used to remove dust particles from the flue gas during the operation of the first fluidized bed furnace 3.

[0064] Spray tower 5 is used for desulfurization and dust removal, and at the same time removes dust particles from the flue gas;

[0065] By using the first cyclone dust collector 7 and the spray tower 5 in combination, the exhaust gas can be further purified.

[0066] In this embodiment, specifically: the flue gas exhaust pipe of the dry distillation furnace 13 is connected to the spray tower 5 through the carbonization furnace tail gas fan 4. By using one spray tower 5, the purification of flue gas during the internal and external water removal process can be completed, thus saving energy and reducing emissions.

[0067] In this embodiment, specifically: the outlet pipe of the first cyclone dust collector 7 and the inlet pipe of the spray tower 5 are connected through the exhaust fan 6.

[0068] In this embodiment, specifically: it also includes a second cyclone dust collector 9, used to remove dust particles in the flue gas during the operation of the dry distillation furnace 13, and the outlet pipe of the second cyclone dust collector 9 is connected to the second fluidized bed furnace 12 through the gas induced draft fan 11.

[0069] Secondly, this utility model also provides a lignite dry distillation and upgrading process, including the following steps:

[0070] S1. Use a loose separation method to remove impurities from lignite;

[0071] S2. The lignite is transported to the first fluidized bed furnace 3 via the first conveying route 2, and the working temperature inside the first fluidized bed furnace 3 is set by the temperature control system. The working temperature inside the first fluidized bed furnace 3 is 350-550℃, and the working time is 20-30 minutes. After removing the external water in the lignite in an aerobic environment, the process proceeds to the next step.

[0072] S3. The lignite after removing external water is transported into the dry distillation furnace 13 through the second conveying route 8, and the working temperature inside the dry distillation furnace 13 is set by the temperature control system 2 in the second fluidized bed furnace 12. The working temperature inside the dry distillation furnace 13 is 280-300℃, and the working time is 20-30min. The internal water in the lignite is removed in an oxygen-free environment.

[0073] S4. Cooling yields high-quality coal, which is then stored in the finished product silo 15.

[0074] In this embodiment, specifically: it also includes:

[0075] The flue gas generated during the removal of external and internal water from lignite is purified by the first cyclone dust collector 7, the second cyclone dust collector 9, and the spray tower 5.

[0076] In this embodiment, the upgrading system and upgrading process can also be used to upgrade long-flame coal.

[0077] Example 2

[0078] Lignite pretreatment: Raw lignite is fed into a pretreatment unit via a conveyor, where the internal temperature is set at 350℃. At this temperature, the surface moisture of the lignite begins to evaporate, and some of the moisture inside the lignite also begins to migrate outward. After a period of preheating, most of the surface moisture is removed, and the moisture content of the lignite is significantly reduced.

[0079] Aerobic removal of external water: The preheated lignite enters an aerobic external water removal device, where the internal temperature is maintained between 350-550℃, preferably 400-500℃. Within this temperature range, the remaining external water on the surface of the lignite continues to evaporate, while the organic matter on the surface of the lignite begins to partially oxidize, releasing heat and further promoting water evaporation. Through this step, the external water on the surface of the lignite is essentially removed.

[0080] Anaerobic removal of internal water: After aerobic external water removal treatment, the lignite enters the anaerobic internal water removal unit, where the internal temperature is set at 280℃. In this anaerobic environment, the moisture inside the lignite begins to evaporate and escape, while the organic matter inside the lignite undergoes pyrolysis, generating valuable products such as semi-coke and coal tar. Through this step, the moisture inside the lignite is effectively removed, and its calorific value is significantly increased.

[0081] Product collection and storage: Upgraded lignite (i.e., high-quality coal) is conveyed to a collection device for storage. Simultaneously, byproducts such as semi-coke and coal tar generated during the anaerobic removal of internal water can also be collected and utilized.

[0082] In operation, this invention achieves a significant improvement in lignite quality and a reduction in energy consumption by precisely controlling the removal temperature of external and internal water as well as the treatment environment.

[0083] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any person skilled in the art can easily conceive of various variations or substitutions within the technical scope disclosed in this utility model, and these should all be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A lignite dry distillation and upgrading system, characterized in that, include: The first conveying route (2) is used to transport lignite; The first boiling furnace (3) is equipped with a temperature control system to set the working temperature of the first boiling furnace (3), provide a high-temperature heat source, and remove water from the lignite. The second conveying route (8) is used to convey lignite after the external water has been removed; A dry distillation furnace (13) is used to pyrolyze lignite after removing external water and to remove internal water from lignite. The second boiling furnace (12) is equipped with a temperature control system II, which is used to set the working temperature of the dry distillation furnace (13); The dry distillation furnace (13) is in a vacuum state.

2. The lignite dry distillation and upgrading system according to claim 1, characterized in that: Also includes: The feeding silo (1) is used to transport lignite into the first conveying route (2); Finished product silo (15) is used to store high-quality coal after upgrading.

3. The lignite dry distillation and upgrading system according to claim 1, characterized in that: Also includes: The first cyclone dust collector (7) is used to remove dust particles from the flue gas during the operation of the first boiling furnace (3); The spray tower (5) is used for desulfurization and dust removal, and at the same time removes dust particles from the flue gas.

4. The lignite dry distillation and upgrading system according to claim 3, characterized in that: The flue gas exhaust pipe of the dry distillation furnace (13) is connected to the spray tower (5) through the tail gas blower (4) of the carbonization furnace.

5. A lignite dry distillation and upgrading system according to claim 3, characterized in that: The exhaust pipe of the first cyclone dust collector (7) is connected to the inlet pipe of the spray tower (5) through the exhaust fan (6).

6. The lignite dry distillation and upgrading system according to claim 1, characterized in that: It also includes a second cyclone dust collector (9) for removing dust particles from the flue gas during the operation of the dry distillation furnace (13), and the outlet pipe of the second cyclone dust collector (9) is connected to the second fluidized bed furnace (12) through a gas induced draft fan (11).

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