Wear-resistant and high-temperature-resistant pneumatic conveying process for semi-coke particles below 5mm based on calcium carbide production and control system

Abstract

The invention discloses a wear-resistant and high-temperature-resistant pneumatic conveying control system and process for semi-coke particles with the particle size smaller than 5 mm based on calcium carbide production. The wear-resistant and high-temperature-resistant pneumatic conveying control system comprises an intermediate bin, a semi-coke screen lower bin, an ash discharging machine, a sealing control piece, a material level meter and a plurality of sets of exhaust ball valves. When the middle bin is used for feeding, the feeding valve is opened, the discharging valve is closed, when the material level reaches the upper limit, the material level indicator sends out a signal, the feeding valve is closed, the discharging valve is opened, materials are evenly fed into the air chamber through the ash discharging machine and are taken away by airflow, only the function of even feeding of the ash discharging machine is utilized, the sealing and air blocking function of the ash discharging machine is not depended on, and the sealing and air blocking function is achieved through the feeding valve and the discharging valve. The service life of the rotary sealing valve can be effectively prolonged, compared with the prior art, abrasion to semi-coke powder and particulate matter is reduced, sealing performance is good, conveying is even and stable, and production efficiency is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of blue coke particle conveying structures, and specifically to a wear-resistant and high-temperature resistant pneumatic conveying process and control system for blue coke particles with a diameter less than 5 mm produced based on calcium carbide. Background Art

[0002] Semi-coke particles are the main raw material for calcium carbide production and must be dried before use to keep the moisture content within the process requirements. To ensure the particle size distribution, the dried semi-coke particles are screened. The particles and powders below 5mm are stored in a powder silo and then pneumatically conveyed to the drying kiln for use as fuel.

[0003] Semi-coke powder and particles are highly abrasive, causing rapid wear and tear on pneumatic conveying feeders and shortening their service life. Semi-coke powder is prone to spontaneous combustion in storage silos. Even with nitrogen protection, localized spontaneous combustion can occasionally occur, with the powder temperature reaching as high as 400°C.

[0004] The characteristics of semi-coke powder are: strong abrasiveness, low moisture content, easy to ignite, high temperature, and no adhesion.

[0005] The existing feeding method is continuous feeding with a rotary sealing valve, which has the disadvantages of rapid wear, poor sealing, and short service life. When the rotor of the rotary sealing valve wears out, it will lose its sealing and air locking function, causing feeding interruption and affecting production.

[0006] To this end, we proposed a wear-resistant and high-temperature resistant pneumatic conveying process and control system for semi-coke particles below 5 mm produced based on calcium carbide. Summary of the Invention

[0007] The purpose of the present invention is to provide a wear-resistant and high-temperature resistant pneumatic conveying control system and protection method for blue coke particles below 5 mm produced based on calcium carbide, so as to solve the problems raised in the above background technology.

[0008] To achieve the above objectives, the present invention provides a wear-resistant and high-temperature resistant pneumatic conveying control system for semi-coke particles below 5 mm produced based on calcium carbide, comprising an intermediate bin, a semi-coke under-screen bin, and an ash unloader. The semi-coke under-screen bin is provided with a sealing control component, and the semi-coke under-screen bin is connected to the intermediate bin and the ash unloader respectively through the sealing control component.

[0009] Preferably, a material level meter and multiple sets of exhaust ball valves are provided in the intermediate bin.

[0010] Preferably, the ash unloader is a high-temperature resistant rotary sealing valve, the surface of the rotor impeller of the ash unloader is sprayed with tungsten carbide alloy wear-resistant material, and the ash unloader adopts a variable frequency control system.

[0011] Preferably, the sealing control component includes a feed valve and a discharge valve, the intermediate bin and the blue charcoal screen bin are connected through the feed valve, the blue charcoal screen bin and the ash unloader are connected through the discharge valve, and control valves are provided above the blue charcoal screen bin and at the bottom of the intermediate bin.

[0012] Preferably, the feed valve and the discharge valve are both ceramic wear-resistant swing valves, and the ceramic wear-resistant swing valve is a DN200 diameter model.

[0013] Preferably, the control valve is a pneumatic ball valve, and the pneumatic ball valve adopts a DN50 diameter model.

[0014] Preferably, the ash unloader is connected to a Roots blower via a connecting pipe, a manual gate valve is provided between the connecting pipe and the intermediate bin, and the manual gate valve is of DN200 diameter.

[0015] The conveying process of the wear-resistant and high-temperature resistant pneumatic conveying control system for semi-coke particles below 5 mm produced by calcium carbide also includes:

[0016] S1: When the intermediate bin is feeding, the feed valve is opened and the discharge valve is closed;

[0017] S2. When the material level reaches the upper limit, the material level meter sends a signal, the feed valve closes, and the discharge valve opens;

[0018] S3. The ash discharger cooperates with the Roots blower to evenly transport the material through airflow.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] This application installs sealing control components at the inlet and outlet of the intermediate bin, and installs a rotary sealing valve ash unloader at the bottom. When the intermediate bin is fed, the feed valve opens and the discharge valve closes. When the material level reaches the upper limit, the level meter sends a signal, the feed valve closes, and the discharge valve opens. The material is evenly fed into the air chamber through the ash unloader and carried away by the airflow. Only the uniform feeding function of the ash unloader is utilized, and its sealing and air locking function is not relied upon. The sealing and air locking function is realized by the feed valve and the discharge valve, which can effectively extend the service life of the rotary sealing valve. Compared with the existing technology, this method reduces the wear on lignite powder and particulate matter, has good sealing, and can transport evenly and smoothly, thereby ensuring production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 Schematic diagram of the conveying process of the present invention;

[0022] Figure 2 This is a schematic diagram of the control principle design of the present invention.

[0023] In the figure: 1. Intermediate bin; 2. Semi-coke under-screen bin; 3. Ash unloader; 4. Material level meter; 5. Feed valve; 6. Discharge valve; 7. Control valve; 8. Roots blower; 9. Manual plug-in valve. DETAILED DESCRIPTION

[0024] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0025] See also Figure 1-Figure 2 The present invention provides a wear-resistant and high-temperature resistant pneumatic conveying control system for semi-coke particles below 5 mm produced based on calcium carbide, comprising an intermediate bin 1, a semi-coke under-screen bin 2, and an ash unloader 3. The semi-coke under-screen bin 2 is provided with a sealing control component, and the semi-coke under-screen bin 2 is connected to the intermediate bin 1 and the ash unloader 3 respectively through the sealing control component;

[0026] The intermediate bin 1 is equipped with a material level meter 4 for monitoring the stacking height of the material in the intermediate bin 1 and multiple sets of exhaust ball valves. In order to balance and compensate for the changes in the pressure in the intermediate bin, two exhaust ball valves are installed to cooperate with the opening and closing of the feed valve and the discharge valve to avoid the problem of shed material caused by pressure difference.

[0027] Ash unloader 3 features a high-temperature resistant rotary seal valve, which continuously and evenly feeds the air chamber. This valve utilizes its uniform feeding function independently of its air-locking function, which is provided by a wear-resistant ceramic swing valve. The ash unloader must be both wear-resistant and heat-resistant. A high-temperature resistant rotary seal valve was selected through consultation with relevant manufacturers.

[0028] The surface of the rotor impeller of the ash discharger 3 is sprayed with tungsten carbide alloy wear-resistant material, which can effectively extend the service life of the rotary sealing valve.

[0029] The ash unloader 3 adopts a frequency conversion control system to flexibly adjust the feeding amount and facilitate the optimization of the conveying amount.

[0030] The sealing control components include a feed valve 5 and a discharge valve 6. The intermediate bin 1 and the semi-coke screen bin 2 are connected via the feed valve 5, and the semi-coke screen bin 2 and the ash unloader 3 are connected via the discharge valve 6. Control valves 7 are provided above the semi-coke screen bin 2 and at the bottom of the intermediate bin 1.

[0031] Both the feed valve 5 and the discharge valve 6 use ceramic wear-resistant swing valves, and the ceramic wear-resistant swing valve adopts the DN200 diameter model. After repeated comparison and screening, the ceramic wear-resistant swing valve was finally selected. The characteristics of this valve are good sealing performance, the wear surface is made of wear-resistant and high-temperature resistant ceramic material, it has a long service life, a simple structure and reliable operation.

[0032] The control valve 7 is a pneumatic ball valve, and the pneumatic ball valve adopts a DN50 diameter model.

[0033] The ash discharger 3 is connected to a Roots blower 8 through a connecting pipe. A manual gate valve 9 is provided between the connecting pipe and the intermediate bin 1. The manual gate valve 9 adopts a DN200 diameter model.

[0034] The conveying process of the wear-resistant and high-temperature resistant pneumatic conveying control system for semi-coke particles below 5 mm produced by calcium carbide also includes:

[0035] S1, when feeding into the intermediate bin 1, the feed valve 5 is opened and the discharge valve 6 is closed;

[0036] S2, when the material level reaches the upper limit, the material level meter 4 sends a signal, the feed valve 5 closes, and the discharge valve 6 opens;

[0037] S3, the ash discharger 3 cooperates with the Roots blower 8 to transport the material evenly through the air flow.

[0038] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0039] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A wear-resistant and high-temperature resistant pneumatic conveying control system for semi-coke particles below 5 mm produced based on calcium carbide, characterized in that: include: An intermediate bin (1), a semi-coke under-screen bin (2), and an ash unloader (3); the semi-coke under-screen bin (2) is provided with a sealing control component, and the semi-coke under-screen bin (2) is connected to the intermediate bin (1) and the ash unloader (3) respectively via the sealing control component; A material level meter (4) and multiple sets of exhaust ball valves are provided in the intermediate bin (1).

2. The wear-resistant and high-temperature resistant pneumatic conveying control system for semi-coke particles with a diameter less than 5 mm produced by calcium carbide according to claim 1 is characterized in that: The ash discharger (3) is a high-temperature resistant rotary sealing valve.

3. The wear-resistant and high-temperature resistant pneumatic conveying control system for semi-coke particles with a diameter less than 5 mm produced by calcium carbide according to claim 1 is characterized in that: The surface of the rotor impeller of the ash discharger (3) is sprayed with tungsten carbide alloy wear-resistant material.

4. The wear-resistant and high-temperature resistant pneumatic conveying control system for semi-coke particles with a diameter less than 5 mm produced by calcium carbide according to claim 1 is characterized in that: The ash discharger (3) adopts a frequency conversion control system.

5. The wear-resistant and high-temperature resistant pneumatic conveying control system for semi-coke particles with a diameter less than 5 mm produced by calcium carbide according to claim 1 is characterized in that: The sealing control component includes a feed valve (5) and a discharge valve (6); the intermediate bin (1) and the semi-coke lower bin (2) are connected via the feed valve (5); the semi-coke lower bin (2) and the ash unloader (3) are connected via the discharge valve (6); and control valves (7) are provided above the semi-coke lower bin (2) and at the bottom of the intermediate bin (1).

6. The wear-resistant and high-temperature resistant pneumatic conveying control system for semi-coke particles with a diameter less than 5 mm produced by calcium carbide according to claim 1 is characterized in that: The feed valve (5) and the discharge valve (6) are both ceramic wear-resistant swing valves, and the ceramic wear-resistant swing valves are of DN200 diameter.

7. The wear-resistant and high-temperature resistant pneumatic conveying control system for semi-coke particles with a diameter less than 5 mm produced by calcium carbide according to claim 5 is characterized in that: The control valve (7) is a pneumatic ball valve, and the pneumatic ball valve adopts a DN50 diameter model.

8. The wear-resistant and high-temperature resistant pneumatic conveying control system for semi-coke particles with a diameter less than 5 mm produced by calcium carbide according to claim 1 is characterized in that: The ash discharger (3) is connected to a Roots blower (8) via a connecting pipe. A manual gate valve (9) is provided between the connecting pipe and the intermediate bin (1). The manual gate valve (9) is of DN200 diameter.

9. A conveying process for wear-resistant and high-temperature resistant pneumatic conveying control system for semi-coke particles below 5 mm produced by calcium carbide, characterized in that: Also includes: S1, when the intermediate bin (1) is fed, the feed valve (5) is opened and the discharge valve (6) is closed; S2. When the material level reaches the upper limit, the material level meter (4) sends a signal, the feed valve (5) closes, and the discharge valve (6) opens; S3, the ash discharger (3) cooperates with the Roots blower (8) to evenly transport the material through airflow.

Images