Nitrocotton slurry steam heating spray head with anti-blocking function

Abstract

The utility model belongs to the technical field of nitrocotton production, and discloses a nitrocotton slurry steam heating spray head with an anti-blocking function, which comprises a steam spray pipe, a steam-liquid mixing chamber and a one-way valve fixedly arranged at a spray outlet of the steam spray pipe, and the steam spray pipe penetrates through one end of the steam-liquid mixing chamber. Steam in the steam spraying pipe can enter the steam-liquid mixing chamber through the one-way valve, the steam-liquid mixing chamber is provided with a feeding port and a discharging port, the feeding port is formed in the side wall of the steam-liquid mixing chamber, and the discharging port and a spraying port of the steam spraying pipe are arranged in the same direction. The steam spray pipe adopts the one-way valve design, so that the blockage problem can be effectively solved, material blockage is prevented, disassembly and cleaning are avoided, the labor intensity is reduced, and the waste of water resources is reduced; the vapor-liquid mixing chamber adopts an arc-shaped design, so that the mixing time is prolonged, meanwhile, slurry adhesion caused by dead angles in the vapor-liquid mixing chamber is avoided, and the mixing and heating efficiency is improved.

Description

Technical Field

[0001] The present application belongs to the technical field of nitrocellulose production, and in particular relates to a nitrocellulose slurry steam heating nozzle with anti-blocking function. Background Art

[0002] During the production process of nitrocellulose, its transportation and processing links are mostly in slurry state, and the nitrocellulose slurry needs to be steam-heated. At present, most of them use steam heating nozzles to pass high-temperature steam into the nitrocellulose slurry to heat it up. However, due to the long nitrocellulose fibers, the fluidity of the nitrocellulose slurry is poor, and the internal pipes of the existing steam nozzles are narrow and easy to be blocked. After the blockage, the nitrocellulose slurry may also be in direct contact with the steam in the pipe for a long time, which poses a high safety risk. After the blockage, it can only be cleared by manual disassembly, which is labor-intensive and cumbersome. There are also many problems such as poor mixing efficiency, incomplete release of steam latent heat, affecting the heating rate of the nitrocellulose slurry, high energy consumption, and unstable product quality.

[0003] The Chinese utility model patent with publication number CN202747837U discloses a steam heater, wherein the direction of the steam outlet is the same as that of the heated liquid outlet, and the steam drives the liquid to move toward the heated liquid outlet, and the movement causes negative pressure to appear at the rear of the heating chamber, prompting the liquid to enter the heating chamber from the liquid inlet, thereby increasing the fluidity of the liquid during heating. However, there are disadvantages such as nitrocellulose slurry and other materials easily entering the steam nozzle through the steam nozzle to cause blockage, the steam-water mixing chamber is relatively narrow, and there are dead corners in the chamber that can cause material accumulation. Summary of the invention

[0004] In view of the deficiencies of the above-mentioned prior art, the present application proposes a nitrocellulose slurry steam heating nozzle with an anti-blocking function. By arranging a one-way valve at the steam nozzle outlet, nitrocellulose slurry and other materials can be effectively prevented from entering the steam nozzle. The feed inlet is symmetrically arranged, and the steam-liquid mixing chamber adopts an arc-shaped design, which avoids problems such as blockage and accumulation of materials and improves the heating efficiency.

[0005] To achieve the above-mentioned purpose, the present application provides the following technical solutions: a nitrocellulose slurry steam heating nozzle with anti-blocking function, comprising a steam nozzle and a steam-liquid mixing chamber, wherein the steam nozzle runs through one end of the steam-liquid mixing chamber, and further comprising a one-way valve fixedly arranged at the spray outlet of the steam nozzle, wherein the steam in the steam nozzle can enter the steam-liquid mixing chamber through the one-way valve;

[0006] The vapor-liquid mixing chamber is provided with a feed inlet and a discharge port. The feed inlet is arranged on the side wall of the vapor-liquid mixing chamber, and the discharge port is arranged in the same direction as the steam nozzle outlet.

[0007] Furthermore, the one-way valve includes a valve body, a spring, a valve plug and a valve limit plate, the valve limit plate is fixedly arranged in the valve body, the valve plug includes a first end and a second end fixedly connected by a connecting rod, the first end is located on one side of the valve limit plate and abuts against the outlet end of the valve body, the second end is located on the other side of the valve limit plate, the connecting rod passes through the valve limit plate, the spring is telescopically arranged between the valve limit plate and the second end along its length direction, and the spring is always in a compressed state.

[0008] Furthermore, the outlet end of the valve body is an inclined surface, and the circumference where the first end abuts against the outlet end of the valve body is an inclined surface matching therewith.

[0009] Furthermore, the feed port is circumferentially opened between one end of the steam nozzle entering the steam-liquid mixing chamber and the nozzle outlet of the steam nozzle.

[0010] Furthermore, four feed ports are symmetrically arranged in the circumferential direction.

[0011] Furthermore, the gas-liquid mixing chamber is designed to be arc-shaped.

[0012] Furthermore, the length of the gas-liquid mixing chamber is 400-750 mm.

[0013] Furthermore, the length of the steam nozzle extending into the steam-liquid mixing chamber is 100-200 mm.

[0014] Furthermore, the diameter of the steam nozzle is 20-40 mm.

[0015] Furthermore, the vapor-liquid mixing chamber is in the shape of a column, a cone or a Laval nozzle, and its maximum diameter is 100-200 mm.

[0016] In general, the above technical solutions conceived by this application can achieve the following beneficial effects:

[0017] 1. The steam nozzle adopts a one-way valve design. When the steam is not flowing, the spring's own elastic force closes the steam nozzle outlet to prevent material backflow, which can effectively solve the blockage problem. When the steam is turned on, the internal pressure of the steam nozzle is greater than the external pressure, and the steam opens the steam nozzle outlet. The steam enters the steam-liquid mixing chamber and mixes with the nitrocellulose slurry without affecting the mixing efficiency.

[0018] 2. The vapor-liquid mixing chamber adopts an arc-shaped design. The nitrocellulose slurry and steam can be mixed multiple times in the vapor-liquid mixing chamber, which increases the mixing time. At the same time, it avoids the dead corners in the vapor-liquid mixing chamber that cause slurry adhesion, thereby improving the mixing and heating efficiency.

[0019] 3. Since the steam nozzle is equipped with a one-way valve, it can prevent material blockage and avoid disassembly and cleaning of the steam nozzle, thereby reducing labor intensity, reducing cleaning operations and avoiding waste of water resources.

[0020] 4. The discharge port, the steam-liquid mixing chamber and the steam nozzle are coaxially arranged, so that negative pressure is easier to form inside the steam-liquid mixing chamber, and the mixing efficiency of the nitrocellulose slurry and the outflow of the discharge port is higher;

[0021] 5. The present application can be used for steam heating processes of 3-15% concentration nitrocellulose slurry, such as fine washing, heating and dehydration of nitrocellulose, and has a wide range of applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic structural diagram of a nitrocellulose slurry steam heating nozzle with an anti-clogging function in one embodiment of the present application;

[0023] Figure 2 This is a schematic diagram of the opening structure of the feed port in one embodiment of the present application;

[0024] Figure 3 This is a schematic diagram of the structure of a one-way valve in a closed state in one embodiment of the present application;

[0025] Figure 4 This is a structural schematic diagram of a one-way valve in an open state in one embodiment of the present application;

[0026] Figure 5 This is a schematic diagram of the structure of a valve limit plate in one embodiment of the present application.

[0027] Throughout the drawings, the same reference numerals are used to denote the same elements or structures, wherein:

[0028] 1-steam nozzle, 2-steam-liquid mixing chamber, 201-feed port, 202-discharge port, 3-check valve, 31-valve body, 32-spring, 33-valve plug, 331-connecting rod, 332-first end, 333-second end, 34-valve limiting plate, 341-limiting hole, 342-through hole. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solutions and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not intended to limit the present application. In addition, the technical features involved in each embodiment of the present application described below can be combined with each other as long as they do not conflict with each other.

[0030] In the description of the present application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application; in addition, in the description of the present application, unless otherwise specified, "multiple" means two or more.

[0031] like Figure 1 , Figure 2 As shown, the present application is a nitrocellulose slurry steam heating nozzle with an anti-blocking function, comprising a steam nozzle and a gas-liquid mixing chamber, the steam nozzle penetrating one end of the gas-liquid mixing chamber, the steam nozzle and the gas-liquid mixing chamber are coaxially arranged, a one-way valve is fixedly connected to a steam nozzle outlet, the one-way valve and the steam nozzle can be threadedly connected or fixed by welding, the steam in the steam nozzle can enter the gas-liquid mixing chamber through the one-way valve, the gas-liquid mixing chamber is provided with a feed inlet and a discharge port, the feed inlet is arranged on the side wall of the gas-liquid mixing chamber, the discharge port is arranged at the opposite end of the steam nozzle, and the discharge port outlet is arranged in the same direction as the steam nozzle outlet and is coaxial with the steam nozzle.

[0032] In this embodiment, Figure 3 As shown, the one-way valve includes a valve body, a spring, a valve plug and a valve limiting plate. The valve limiting plate is welded to the inner wall of the valve body and is used to limit the movable direction of the valve plug and the moving distance along the axial direction of the valve body. The valve plug is used to control the opening or closing of the one-way valve, including a first end and a second end fixedly connected by a connecting rod. The first end is located on one side of the valve limiting plate and abuts against the outlet end of the valve body, and the second end is located on the other side of the valve limiting plate. The connecting rod passes through the valve limiting plate. The spring is telescopically arranged between the valve limiting plate and the second end along its length direction. The spring is always in a compressed state. Since the valve limiting plate is fixed and cannot be moved, the elastic force of the spring is always applied to the second end of the valve plug, so that the second end has a tendency to move away from the first end, and through the connecting rod, the first end is always tightly abutted against the outlet end of the valve body when the one-way valve is not passing steam, thereby blocking the outlet end, so that the material in the steam-liquid mixing chamber cannot pass through the one-way valve into the steam nozzle; as shown Figure 4 As shown, when steam is introduced into the steam nozzle, the steam pressure inside the one-way valve body pushes the valve plug to further compress the spring, and the first end of the valve plug is pushed away from the outlet end of the valve body. The outlet end of the valve body is opened, so that the one-way valve is in an open state, and steam enters the steam-liquid mixing chamber through the one-way valve. At this time, since the pressure inside the valve body is greater than the pressure in the steam-liquid mixing chamber, the material in the steam-liquid mixing chamber will not enter the valve body, thereby avoiding the material entering the steam nozzle and causing blockage. Figure 5As shown, a limiting hole for the connecting rod to pass through is provided at the center of the valve limiting plate. The diameter of the limiting hole is slightly larger than the diameter of the connecting rod, which can limit the shaking of the connecting rod so that it always moves along the axial direction of the valve body. In order to reduce the resistance to steam entering the valve body, the valve limiting plate is also provided with multiple through holes for steam to pass through.

[0033] In order to better seal the outlet end of the valve body with the valve plug, the outlet end of the valve body is arranged as an inclined surface, and the circumference of the first end of the valve plug abutting against the outlet end of the valve body is an inclined surface matching therewith.

[0034] The feed inlet is circumferentially arranged between one end of the steam nozzle entering the steam-liquid mixing chamber and the steam nozzle outlet. In order to make the feed more uniform and smooth and to make the contact with the steam more complete, four feed inlets are symmetrically arranged circumferentially.

[0035] In order to mix the slurry and steam multiple times in the gas-liquid mixing chamber, increase the mixing time, and avoid dead corners in the gas-liquid mixing chamber that cause slurry adhesion, the gas-liquid mixing chamber is designed to be arc-shaped and the material can be selected from stainless steel.

[0036] Since the steam injection rate is affected by the aperture of the steam port of the ejector, the high-velocity steam will become tiny bubbles when it collides with the inner wall of the gas-liquid mixing chamber and the slurry. The larger the contact area with the slurry, the more sufficient the heat exchange will be. When the steam contacts the nitrocellulose slurry, the faster the flow rate and the more uniform the dispersion, the faster the nitrocellulose heats up. Conversely, the slower the temperature rises, resulting in a worse heating effect. Therefore, the overall size of the steam heating nozzle is designed, and the length of the gas-liquid mixing chamber is designed to be 400-750 mm. In this embodiment, the length of the gas-liquid mixing chamber is 400 mm; in another embodiment, the length of the gas-liquid mixing chamber is 550 mm; in another embodiment, the length of the gas-liquid mixing chamber is 750 mm.

[0037] The length of the steam nozzle extending into the steam-liquid mixing chamber is 100-200 mm. In this embodiment, the length of the steam nozzle extending into the steam-liquid mixing chamber is 100 mm; in another embodiment, the length of the steam nozzle extending into the steam-liquid mixing chamber is 150 mm; in another embodiment, the length of the steam nozzle extending into the steam-liquid mixing chamber is 200 mm.

[0038] The diameter of the steam nozzle is 20-40 mm. In this embodiment, the diameter of the steam nozzle is 20 mm; in another embodiment, the diameter of the steam nozzle is 30 mm; in another embodiment, the diameter of the steam nozzle is 40 mm.

[0039] The gas-liquid mixing chamber may be cylindrical, conical or Laval nozzle-shaped, with a maximum diameter of 100-200 mm. When it is conical, the cross-sectional diameter thereof gradually increases toward the discharge port. In this embodiment, the maximum diameter of the gas-liquid mixing chamber is 100 mm; in another embodiment, the maximum diameter of the gas-liquid mixing chamber is 150 mm; in another embodiment, the maximum diameter of the gas-liquid mixing chamber is 200 mm.

[0040] The steam heating nozzle of the present application can be applied to equipment for heating nitrocellulose slurry such as nitrocellulose fine washing machines and concentrators, and can be used for steam heating of nitrocellulose slurry with a concentration of 3-15%. The steam heating nozzle is installed in a nitrocellulose slurry storage tank, 800-1500 mm away from the bottom of the tank. When in use, the steam pressure can be set to 0.25-1Mpa. When the nitrocellulose slurry submerges the steam heating nozzle of the present application, the steam valve is opened, and steam is ejected from the steam nozzle outlet under the steam pressure. The one-way valve arranged at the steam nozzle outlet is opened, and steam is ejected from the steam nozzle and quickly enters the gas-liquid mixing chamber. The nitrocellulose slurry enters from the feed port opened on the side of the gas-liquid mixing chamber and is fully mixed with the steam. After mixing, it is ejected from the discharge port along with the high-speed steam and mixed with the nitrocellulose slurry that has not entered the gas-liquid mixing chamber, and heat exchange is performed again to achieve the purpose of rapid heating. Due to the high flow rate inside the gas-liquid mixing chamber, according to the Bernoulli principle, the pressure inside the gas-liquid mixing chamber decreases to form a negative pressure, and the nitrocellulose slurry continuously enters from the feed port under the action of pressure, and the materials are mixed and heated to form a cycle, thereby achieving the purpose of continuous heating of the nitrocellulose slurry. When the nitrocellulose slurry is heated to the specified temperature, the steam valve is closed, and the one-way valve at the steam nozzle outlet is closed to prevent the material from entering and causing blockage, completing the steam heating process of the nitrocellulose slurry. After the heating is completed, the steam pipe and steam heating nozzle can be cleaned without disassembling the steam nozzle for separate cleaning.

[0041] In summary, the steam nozzle of the present application adopts a one-way valve design, which prevents material blockage while avoiding disassembly and cleaning, reduces labor intensity, and reduces water waste; an arc-shaped steam-liquid mixing chamber is adopted, and the pipe connecting the steam nozzle adopts an internal smooth pipe. Steam is ejected from the steam nozzle at high speed, forming a negative pressure in the steam-liquid mixing chamber, and the material flows in from the side feed port to mix with the steam, and then is ejected from the discharge port, which increases the mixing time of the material and steam, improves the steam injection speed, and improves the mixing effect of the steam and slurry. The material is mixed continuously for multiple times in this process, which improves the heating efficiency; and the arc-shaped cavity prevents the adhesion of nitrocellulose, and the larger steam-water mixing chamber and the smooth steam injection pipe prevent blockage and accumulation of materials, thereby improving production efficiency and process safety.

[0042] It will be easily understood by those skilled in the art that the above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. A nitrocellulose slurry steam heating nozzle with anti-blocking function, comprising a steam nozzle and a steam-liquid mixing chamber, wherein the steam nozzle runs through one end of the steam-liquid mixing chamber, and is characterized in that: It also includes a one-way valve fixedly arranged at the steam nozzle outlet, and the steam in the steam nozzle can enter the steam-liquid mixing chamber through the one-way valve; The vapor-liquid mixing chamber is provided with a feed inlet and a discharge port. The feed inlet is arranged on the side wall of the vapor-liquid mixing chamber, and the discharge port is arranged in the same direction as the steam nozzle outlet.

2. The nitrocellulose slurry steam heating nozzle with anti-blocking function according to claim 1, characterized in that: The one-way valve includes a valve body, a spring, a valve plug and a valve limit plate. The valve limit plate is fixedly arranged in the valve body. The valve plug includes a first end and a second end fixedly connected by a connecting rod. The first end is located on one side of the valve limit plate and abuts against the outlet end of the valve body. The second end is located on the other side of the valve limit plate. The connecting rod passes through the valve limit plate. The spring is telescopically arranged between the valve limit plate and the second end along its length direction. The spring is always in a compressed state.

3. The nitrocellulose slurry steam heating nozzle with anti-blocking function according to claim 2, characterized in that: The outlet end of the valve body is an inclined surface, and the circumference where the first end abuts against the outlet end of the valve body is an inclined surface matching therewith.

4. The nitrocellulose slurry steam heating nozzle with anti-blocking function according to claim 1, characterized in that: The feed port is circumferentially opened between one end of the steam nozzle entering the steam-liquid mixing chamber and the steam nozzle outlet.

5. The nitrocellulose slurry steam heating nozzle with anti-blocking function according to claim 4, characterized in that: The feed openings are symmetrically arranged in four directions.

6. The nitrocellulose slurry steam heating nozzle with anti-blocking function according to claim 1, characterized in that: The gas-liquid mixing chamber is designed to be arc-shaped.

7. The nitrocellulose slurry steam heating nozzle with anti-blocking function according to claim 1, characterized in that: The length of the gas-liquid mixing chamber is 400-750 mm.

8. The nitrocellulose slurry steam heating nozzle with anti-blocking function according to claim 1, characterized in that: The length of the steam nozzle extending into the steam-liquid mixing chamber is 100-200 mm.

9. The nitrocellulose slurry steam heating nozzle with anti-blocking function according to claim 1, characterized in that: The diameter of the steam nozzle is 20-40 mm.

10. The nitrocellulose slurry steam heating nozzle with anti-blocking function according to claim 1, characterized in that: The gas-liquid mixing chamber is in the shape of a column, a cone or a Laval nozzle, and the diameter at the largest point is 100-200 mm.

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