Feeding device for continuous furfural production

Abstract

The utility model aims to provide a feeding device for continuous furfural production, which belongs to the technical field of furfural production and comprises a cylinder barrel, and the cylinder barrel sequentially comprises a stroke section, a feeding section and an extrusion sealing section. A travel switch is arranged on the outer side of the travel section of the cylinder barrel, a feeding port is formed in the top end of the feeding section of the cylinder barrel, and a preheating jacket layer is arranged on the outer side of the extrusion sealing section of the cylinder barrel. A piston is arranged in the cylinder barrel, one end of the piston is connected with an oil cylinder, the other end of the oil cylinder extends out of the outer side of the cylinder barrel, a limiting stopper is arranged on the oil cylinder, and one end of the limiting stopper penetrates through the travel switch. By using the sealing device, not only can the steam pressure of 0.8 MPa be sealed, but also continuous feeding can be realized.

Description

Technical Field

[0001] The utility model belongs to the technical field of furfural production, and particularly relates to a feeding device for continuous furfural production. Background Art

[0002] Currently, furfural production and hydrolysis are the most important parts of furfural production in my country. A typical hydrolysis process is the currently widely used intermittent series hydrolysis process. After years of development, the hydrolysis pot has only been enlarged, but the intermittent process has many disadvantages: the production process repeats itself in a cycle of filling, increasing pressure, hydrolysis, and emptying. This process has the following disadvantages:

[0003] 1. Steam is consumed during pressure increase, pressure reduction and boiler discharge;

[0004] 2. When centralized boiler discharge is used, a large amount of harmful gases are difficult to recover, and the recycling and environmental protection equipment must be large enough (large equipment and large investment);

[0005] 3. The environmental protection equipment is used when the pot is drained, and it runs idle when it is not drained, which consumes a lot of electricity;

[0006] 4. It takes a certain amount of time for the hydrolysis pot to rise from normal pressure to hydrolysis pressure, which is very likely to form resin and affect the yield of furfural;

[0007] 5. It requires a large number of workers, making intermittent automation difficult to implement and requiring high labor intensity. Utility Model Content

[0008] The purpose of the utility model is to provide a feeding device for continuous furfural production.

[0009] The utility model adopts the following technical solutions:

[0010] A feeding device for continuous furfural production comprises a cylinder, wherein the cylinder comprises a travel section, a feed section, and an extrusion sealing section in sequence; a travel switch is provided on the outside of the travel section of the cylinder, a feed port is provided at the top of the feed section of the cylinder, and a preheating jacket is provided on the outside of the extrusion sealing section of the cylinder;

[0011] A piston is provided in the cylinder barrel, one end of the piston is connected to the oil cylinder, the other end of the oil cylinder extends out of the cylinder barrel, a limiter is provided on the oil cylinder, and one end of the limiter passes through the travel switch.

[0012] Furthermore, a discharge port is provided at one end of the cylinder barrel close to the extrusion sealing section.

[0013] Furthermore, the oil cylinder and the piston are connected via threads.

[0014] Furthermore, one end of the oil cylinder is connected to a hydraulic oil station for providing a power source.

[0015] Furthermore, the inner diameter of the extrusion sealing section of the cylinder barrel expands step by step toward the discharge port.

[0016] The beneficial effects of the utility model are as follows:

[0017] 1. By using the utility model, it is possible to seal the steam pressure of 0.8MPa and to feed continuously.

[0018] 2. The extruded raw material expands rapidly when it is exported, which can increase the hydrolysis yield of furfural.

[0019] 3. The extrusion sealing section of the utility model can reduce the load during feeding by setting a gradually expanding pipe diameter. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural diagram of the utility model;

[0021] Among them: 1-cylinder; 2-travel switch; 3-feeding port; 4-preheating jacket; 5-piston; 6-oil cylinder; 7-limiter; 8-discharging port. DETAILED DESCRIPTION

[0022] The present invention will be further described with reference to the accompanying drawings.

[0023] As shown in the figure, a feeding device for continuous furfural production includes a cylinder 1, which includes a travel section, a feeding section, and an extrusion sealing section in sequence; a travel switch 2 is provided on the outside of the travel section of the cylinder 1, a feed port 3 is provided at the top of the feeding section of the cylinder 1, and a preheating jacket 4 is provided on the outside of the extrusion sealing section of the cylinder 1;

[0024] A piston 5 is provided in the cylinder 1 , one end of the piston 5 is connected to an oil cylinder 6 , the other end of the oil cylinder 6 extends out of the cylinder 1 , a limiter 7 is provided on the oil cylinder 6 , one end of the limiter 7 passes through the travel switch 2 .

[0025] Furthermore, a discharge port 8 is provided at one end of the cylinder 1 close to the extrusion sealing section.

[0026] Furthermore, the oil cylinder 6 and the piston 5 are connected via threads.

[0027] Furthermore, one end of the oil cylinder 6 is connected to a hydraulic oil station for providing a power source.

[0028] Furthermore, the inner diameter of the extrusion sealing section of the cylinder 1 is gradually expanded toward the discharge port 8 .

[0029] The utility model is equipped with a hydraulic oil station which is the power source. The oil station transmits power to the oil cylinder for back and forth travel (controlled and guided by a travel switch).

[0030] The preheating jacket of the extrusion sealing section can be heated by steam adjustment as needed.

[0031] The working process of this utility model is as follows:

[0032] The furfural hydrolysis process involves crushing corncobs into 1-1.5 cm particles, mixing them with dilute sulfuric acid (6%-7%), and stirring thoroughly. Then, a piston-type forced extrusion (to remove excess moisture) creates a hardened mass in the extrusion section, providing a pressure-resistant seal that can withstand and seal saturated steam at approximately 0.8 MPa over extended periods. The power source is a hydraulic oil station assembly operating at a pressure between 10-15 MPa. Dilute sulfuric acid is corrosive, so corrosion-resistant materials such as 316L stainless steel are used throughout the feed section. (316L is used for vulnerable parts; its high value and difficulty in maintenance require corrosion-resistant and hard 321 stainless steel.)

[0033] In order to solve the main hydrolysis part in the continuous furfural production process developed by the company, the feeding is timely, quantitative and stable, with a feeding time of 8-9 seconds, 3-5 kilograms each time, and about 1.4-2 tons per hour.

[0034] This utility model device is an important part of the automation control of the continuous hydrolysis process and is also the most important part of this continuous hydrolysis device. The saturated steam in the reactor is sealed by the hardness of the material extrusion.

[0035] The above description of the present invention and its embodiments is non-limiting. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. In short, if a person skilled in the art is inspired by the above, and does not deviate from the purpose of the present invention, without inventive design, a structure and embodiment similar to the technical solution should fall within the scope of protection of the present invention.

Claims

1. A feeding device for continuous furfural production, characterized in that: The invention comprises a cylinder (1), wherein the cylinder (1) comprises a travel section, a feed section and an extrusion sealing section in sequence; a travel switch (2) is provided on the outside of the travel section of the cylinder (1), a feed port (3) is provided on the top of the feed section of the cylinder (1), and a preheating sleeve (4) is provided on the outside of the extrusion sealing section of the cylinder (1); A piston (5) is provided in the cylinder (1), one end of the piston (5) is connected to an oil cylinder (6), the other end of the oil cylinder (6) extends out of the cylinder (1), a limiter (7) is provided on the oil cylinder (6), and one end of the limiter (7) passes through the travel switch (2); The inner diameter of the extrusion sealing section of the cylinder (1) increases step by step toward the discharge port (8).

2. A feeding device for continuous furfural production according to claim 1, characterized in that: An outlet (8) is provided at one end of the cylinder (1) close to the extrusion sealing section.

3. A feeding device for continuous furfural production according to claim 1, characterized in that: The oil cylinder (6) and the piston (5) are connected via threads.

4. A feeding device for continuous furfural production according to claim 1, characterized in that: One end of the oil cylinder (6) is connected to a hydraulic oil station for providing a power source.

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