Jacket type spiral conveying device for AKD (Alkyl Ketene Dimer) granulation production

Abstract

A jacket type spiral conveying device for AKD granulation production comprises a jacket type spiral conveyor and a temperature adjusting water tank used for being matched with the jacket type spiral conveyor, the jacket type spiral conveyor comprises a spiral conveyor body and a jacket arranged on the outer side of the spiral conveyor body in a sleeving mode, one end of the spiral conveyor body is an input end, and the other end of the spiral conveyor body is an output end. The other end of the spiral conveyor is arranged as an output end, the input end of the spiral conveyor is externally connected with a stock bin I through a feeding pipeline, and the output end of the spiral conveyor is externally connected with a stock bin II through a discharging pipeline; the bottom of the temperature adjusting water tank is communicated with the jacket through a water inlet pipeline, a temperature adjusting water pump and a temperature adjusting control valve are installed on the water inlet pipeline, the top of the temperature adjusting water tank is communicated with the jacket through a water return pipeline, and a heater and a temperature measuring instrument are further installed on the temperature adjusting water tank. The problem that the product quality is affected by condensate water generated due to low AKD granulation discharging temperature is solved, it can be guaranteed that AKD granules are not melted in the heating process, and the stability of product packaging and storage quality is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to synthetic papermaking sizing agent AKD production equipment especially a jacketed screw conveyor device for AKD granulation production. BACKGROUND

[0002] Alkyl ketene dimer (AKD) is an unsaturated lactone, which can be used in papermaking / alkaline sizing agent, and is mainly used as internal sizing agent for copper plate base paper, copying paper, archive paper, dictionary paper and high-quality writing paper, and the sizing pH value can reach about 8.0, which is widely used at home and abroad.

[0003] At present, AKD synthesis mainly has two processes:

[0004] One is a solvent process, and the main raw materials are triethylamine, fatty acid chloride and toluene, wherein toluene is a solvent, and due to the presence of the solvent toluene in the synthesis reaction, the material flowability is good and the viscosity is low, and a kettle type stirring mixing reaction mode is generally adopted;

[0005] The other is a solvent-free process, and the main raw materials are triethylamine and fatty acid chloride; in the solvent-free AKD synthesis process for papermaking additives, the material viscosity is large in the later stage of the reaction, and the material contains fine triethylamine hydrochloride solid particles, and the material viscosity can reach 130000 mPa.s at a temperature T=65℃, and after the reaction is completed, the triethylamine hydrochloride solid particles in the AKD product need to be dissolved in the solution, so that the AKD is layered in the triethylamine hydrochloride aqueous solution, and thus the AKD product with high purity is obtained; finally, the AKD is dehydrated under vacuum to remove volatile impurities.

[0006] In the prior art, the solvent-free process is often used for AKD synthesis production, but after the AKD product is cooled by a steel belt granulator, the AKD granulation product is obtained, since the temperature of the steel belt granulator is 8℃ and the temperature of the AKD granulation is 13℃, and the air temperature is about 30℃ in summer, when the cold material meets the hot air, a layer of condensed water is formed on the surface of the material, the reaction of AKD and water will affect the quality of AKD, and the AKD content is reduced. UTILITY MODEL CONTENTS

[0007] The utility model solves the technical problems of the prior art, provides a jacketed screw conveyor device for AKD granulation production, which solves the problem of condensation water caused by low AKD granulation discharge temperature affecting product quality, and ensures that the AKD granulation does not melt during the heating process, which helps to improve the product packaging storage quality stability.

[0008] The technical problem to be solved by the utility model is realized through the following technical scheme. The utility model relates to a jacketed screw conveying device for AKD granulation production, which comprises a jacketed screw conveyor for AKD conveying and a temperature adjusting water tank matched with the jacketed screw conveyor, the jacketed screw conveyor comprises a screw conveyor and a jacket sleeved outside the screw conveyor, one end of the screw conveyor is arranged as an input end, the other end of the screw conveyor is arranged as an output end, the input end of the screw conveyor is externally connected with a stock bin I through a feeding pipe, and the output end of the screw conveyor is externally connected with a stock bin II through a discharging pipe; the bottom of the temperature adjusting water tank is communicated with the jacket through a water inlet pipe, a temperature adjusting water pump and a temperature adjusting control valve are installed on the water inlet pipe, the top of the temperature adjusting water tank is communicated with the jacket through a water return pipe, and a heater and a temperature measuring instrument are additionally installed on the temperature adjusting water tank.

[0009] The technical problem to be solved by the utility model can be further realized through the following technical scheme, and for the above-mentioned jacketed screw conveying device for AKD granulation production, the jacketed screw conveyor comprises five sections of screw conveyors fixed and communicated in sequence, and the conveying direction of one section of screw conveyor is perpendicular to the conveying direction of the other section of screw conveyor in the two adjacent sections of screw conveyors.

[0010] The technical problem to be solved by the utility model can be further realized through the following technical scheme, and for the above-mentioned jacketed screw conveying device for AKD granulation production, the five sections of screw conveyors are screw conveyor I, screw conveyor II, screw conveyor III, screw conveyor IV and screw conveyor V respectively, the screw conveyor I is externally connected with the stock bin I, the screw conveyor V is externally connected with the stock bin II, the screw conveyor II, the screw conveyor IV and the screw conveyor V are arranged transversely, and the screw conveyor I and the screw conveyor III are arranged longitudinally.

[0011] The technical problem to be solved by the utility model can be further realized through the following technical scheme, and for the above-mentioned jacketed screw conveying device for AKD granulation production, the screw conveyor V is arranged transversely and obliquely.

[0012] The technical problem to be solved by the utility model can be further realized through the following technical scheme, and for the above-mentioned jacketed screw conveying device for AKD granulation production, the water inlet pipe comprises two parallel water inlet branch pipes, and the temperature adjusting water pump and the temperature adjusting control valve are installed on each water inlet branch pipe.

[0013] The technical problem to be solved by the utility model can be further realized through the following technical scheme, and for the above-mentioned jacketed screw conveying device for AKD granulation production, the heater is provided with two, and the two heaters are arranged on the two sides of the temperature adjusting water tank respectively.

[0014] The technical problem solved by the utility model can be further realized by the following technical scheme, and for the jacketed screw conveying device for AKD granulation production, a strip-shaped window for conveniently observing the water level is further installed on the temperature adjusting water tank.

[0015] The technical problem solved by the utility model can be further realized by the following technical scheme, and for the jacketed screw conveying device for AKD granulation production, an overflow pipeline is further installed on the top of the temperature adjusting water tank.

[0016] Compared with the prior art, the utility model adopts the jacketed screw conveying device to replace the original conveying device, so that the AKD discharge temperature approaches room temperature, which not only solves the problem of condensate water caused by low AKD granulation discharge temperature affecting product quality, but also ensures that the AKD granulation does not melt during the jacket heating process; the device is used for AKD granulation production, temperature control is stable, operation is convenient, and product packaging storage quality stability can be improved. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a structural schematic view of the utility model. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model more clear, the technical scheme in the embodiments of the utility model will be clearly and completely described below in combination with the drawings of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0019] Referring to Figure 1 A jacketed screw conveying device for AKD granulation production, comprising a jacketed screw conveyor for AKD conveying and a temperature adjusting water tank 8 for cooperating with the jacketed screw conveyor, the jacketed screw conveyor is used for conveying AKD, and the temperature adjusting water tank 8 is used for conveying circulating water into the jacketed screw conveyor to regulate the temperature of AKD, thereby avoiding the problem of condensate water caused by low AKD granulation discharge temperature affecting product quality.

[0020] Specifically:

[0021] The jacketed screw conveyor comprises a screw conveyor and a jacket sleeved outside the screw conveyor, one end of the screw conveyor is provided as an input end, the other end of the screw conveyor is provided as an output end, the input end of the screw conveyor is externally connected with the stock bin I6 through a feeding pipe, and the output end of the screw conveyor is externally connected with the stock bin II 7 through a discharging pipe, so that the AKD in the stock bin I6 is input into the screw conveyor, the AKD is conveyed into the stock bin II 7 through the screw conveyor, and the conveying operation of the AKD is realized.

[0022] The jacketed screw conveyor comprises five sections of screw conveyors fixed and communicated in sequence, and the conveying direction of one of the two adjacent sections of screw conveyors is perpendicular to the conveying direction of the other section of screw conveyor, which not only meets the AKD transfer requirement in the complex production process, but also realizes flexible adjustment of the AKD flow direction by changing the conveying direction (perpendicular or horizontal), and the layout helps to optimize the space utilization and reduce the risk of AKD blockage in the conveying process.

[0023] Preferably, the five sections of screw conveyors are screw conveyor I1, screw conveyor II 2, screw conveyor III 3, screw conveyor IV 4 and screw conveyor V 5, the screw conveyor I1 is externally connected with the stock bin I6, the screw conveyor V 5 is externally connected with the stock bin II 7, the screw conveyors II 2, IV 4 and V 5 are arranged transversely, and the screw conveyors I1 and III 3 are arranged longitudinally, which helps to realize uniform mixing or direction change of the AKD in the conveying process; further preferably, the screw conveyor V 5 is arranged transversely and obliquely, so as to utilize gravity to assist the AKD to flow out, reduce the power consumption during discharging, better input the stock bin II 7, and the specific inclination angle of the screw conveyor V 5 can be determined according to the actual situation.

[0024] The bottom of the temperature-adjusting water tank 8 is communicated with the jacket through a water inlet pipe 9, the temperature-adjusting water pump 11 and the temperature-adjusting control valve 12 are installed on the water inlet pipe 9, the top of the temperature-adjusting water tank 8 is communicated with the jacket through a water return pipe 10, so that the circulating water can flow between the temperature-adjusting water tank 8 and the jacket through the water inlet pipe 9 and the water return pipe 10, thereby facilitating the use of the circulating water to maintain the stability of the AKD in the conveying process.

[0025] Preferably, the water inlet pipe 9 comprises two parallel water inlet branch pipes, the temperature-adjusting water pump 11 and the temperature-adjusting control valve 12 are installed on each water inlet branch pipe, which ensures the flexibility and reliability of temperature adjustment, and such design allows maintenance or replacement of part of the pipe without stopping the machine, thereby improving the operation efficiency of the system.

[0026] In order to realize the temperature control of the circulating water in the temperature regulating water tank 8, a heater 13 and a temperature measuring instrument are also installed on the temperature regulating water tank 8, which together constitute an accurate temperature control system. The heater 13 is used to preheat or maintain the temperature of the circulating water, and the temperature measuring instrument monitors the water temperature in real time to ensure that it fluctuates within the preset range, thereby meeting the requirements of AKD granulation for temperature sensitivity; preferably, the heater 13 is provided with two, and the two heaters 13 are respectively arranged on both sides of the temperature regulating water tank 8.

[0027] In order to ensure the normal operation of the water circulation system and prevent dry burning or water overflow, a strip window 14 for observing the water level is also installed on the temperature regulating water tank 8, and an overflow pipeline 15 is also installed on the top of the temperature regulating water tank 8.

[0028] The specific use process of the jacketed screw conveying device for AKD granulation production provided in the present application is as follows:

[0029] Before use, first check whether the jacketed screw conveying device is intact, whether each part is firmly connected, and especially the sealing property of the jacket to prevent leakage of heating or cooling medium;

[0030] Check whether the temperature regulating water tank 8, heater 13, temperature measuring instrument, temperature regulating water pump 11 and temperature regulating control valve 12 and other equipment are in normal working condition;

[0031] According to the production needs, prepare the AKD material to be conveyed and store it in the silo I6;

[0032] Ensure that the parameters such as the nature, particle size and humidity of AKD meet the production requirements to ensure the conveying effect and product quality;

[0033] Inject an appropriate amount of water into the temperature regulating water tank 8, and adjust the water temperature to the preset range through the heater 13;

[0034] Start the temperature regulating water pump 11, open the temperature regulating control valve 12, and make the circulating water form a closed loop flow between the jacket and the temperature regulating water tank 8;

[0035] Start the jacketed screw conveyor, and put the AKD material from the silo I6 into the input end of the screw conveyor I1 through the feeding pipeline;

[0036] With the rotation of the screw shaft, the AKD is pushed by the screw blade, and sequentially passes through the screw conveyors I1 to V, and finally enters the silo II7 through the discharge pipeline;

[0037] During the conveying process, the circulating water in the jacket absorbs the heat generated by the AKD through heat exchange, thereby maintaining the stable temperature of the AKD during the conveying process;

[0038] According to the actual situation of AKD conveying and the reading of temperature measuring instrument, the rotation speed of screw conveyor, the flow of temperature control water pump 11 and the power of heater 13 and other parameters are adjusted in time;

[0039] By adjusting the opening of temperature control valve 12, the flow and temperature of circulating water are controlled to achieve the best conveying effect and temperature control;

[0040] After the production is completed, the jacketed screw conveying device is gradually closed according to the equipment shutdown procedure;

[0041] First, the operation of the screw conveyor is stopped, and then the temperature control water pump 11 and the heater 13 are turned off.

[0042] Through the above specific use process, the jacketed screw conveying device is designed in detail, which not only realizes the efficient and continuous conveying of AKD material, but also improves the stability of the production process and the product quality through accurate temperature control. The multi-section screw combination, flexible conveying direction adjustment and perfect temperature control system jointly constitute an advanced production equipment that meets the needs of modern paper industry.

Claims

1. A jacketed screw conveyor for AKD granulation production, characterized by: The jacketed screw conveyor for AKD conveying and the temperature-adjusting water tank cooperating with the jacketed screw conveyor are included, the jacketed screw conveyor includes a screw conveyor and a jacket sleeved outside the screw conveyor, one end of the screw conveyor is arranged as an input end, the other end of the screw conveyor is arranged as an output end, the input end of the screw conveyor is externally connected with a stock bin I through a feeding pipe, and the output end of the screw conveyor is externally connected with a stock bin II through a discharging pipe; the bottom of the temperature-adjusting water tank is communicated with the jacket through a water inlet pipe, a temperature-adjusting water pump and a temperature-adjusting control valve are installed on the water inlet pipe, the top of the temperature-adjusting water tank is communicated with the jacket through a water return pipe, and a heater and a temperature measuring instrument are further installed on the temperature-adjusting water tank.

2. The jacketed screw conveyor for AKD granulation production according to claim 1, characterized in that: The jacketed screw conveyor includes five sections of screw conveyors fixed and communicated in sequence, and the conveying direction of one of the screw conveyors in the two adjacent screw conveyors is perpendicular to the conveying direction of the other screw conveyor.

3. The jacketed screw conveyor for AKD prilling production according to claim 2, characterized in that: The five sections of screw conveyors are screw conveyor I, screw conveyor II, screw conveyor III, screw conveyor IV and screw conveyor V in sequence, the screw conveyor I is externally connected with the stock bin I, the screw conveyor V is externally connected with the stock bin II, the screw conveyors II, IV and V are arranged transversely, and the screw conveyors I and III are arranged longitudinally.

4. The jacketed screw conveyor for AKD prilling production according to claim 3, characterized in that: The screw conveyor V is arranged transversely and obliquely.

5. The jacketed screw conveyor for AKD granulation production according to claim 1, characterized in that: The water inlet pipe includes two water inlet branch pipes arranged in parallel, and the temperature-adjusting water pump and the temperature-adjusting control valve are installed on each water inlet branch pipe.

6. The jacketed screw conveyor for AKD granulation production according to claim 1, characterized in that: The heater is provided with two heaters arranged on the two sides of the temperature-adjusting water tank.

7. The jacketed screw conveyor for AKD prilling production according to claim 1, characterized in that: A strip-shaped window for observing the water level is further installed on the temperature-adjusting water tank.

8. The jacketed screw conveyor for AKD granulation production according to claim 1, characterized in that: An overflow pipe is further installed on the top of the temperature-adjusting water tank.

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