CN111422569A - A high-concentration solution or solid material conveying device with heat exchange function - Google Patents

Abstract

The invention discloses a device with heat exchange function for conveying high-concentration solution or solid granular material. The invention includes a frequency conversion motor reducer that drives the rotation of a guide vane shaft, a casing, a material inlet and a material outlet, which are arranged in the casing. The helical conveying guide vane, the shaft for fixing the guide vane and the bearing for fixing the guide vane shaft, the device of the present invention is provided with a heating cavity outside the casing, and the guide vane shaft and the inside of the guide vane are both The guide vane shaft cavity is provided with a heating medium input end and a cooling medium output end respectively communicating with each other, and the initial end and the terminal end of the guide vane cavity are respectively connected with channels and the guide vane shaft cavity. The present invention can also be used as an independent and complete equipment for conveying high-concentration solution or solid stream materials and simultaneously heating or cooling the materials, so as to meet the technological requirements, greatly liberate productivity and improve work efficiency.

Description

A high-concentration solution or solid material conveying device with heat exchange function

technical field

The present invention relates to a high-concentration solution or solid material conveying device with heat exchange function. To be precise, the present invention relates to a conveying device capable of conveying high-concentration solution and solid particulate material. A helical conveying guide vane in a housing, a conveying device for fixing a shaft of the guide vane and a bearing for fixing the guide vane shaft.

Background technique

The device used for conveying solid granular materials in industrial production is a commonly used device. This type of device basically includes a casing, a material inlet and outlet, a spiral conveying guide vane arranged in the casing, and a fixed The shaft of the guide vane and the bearing for fixing the guide vane shaft.

In production practice, there is often such a situation. With the increase of solution concentration, the viscosity of the solution increases, the surface tension increases, and the fluidity becomes poor. During the heat exchange process, crystals will accumulate and scale on the surface of the heat exchanger, which is difficult to form. With continuous effective and continuous flow, the traditional method cannot maintain the normal heat exchange work to continue smoothly. The present invention solves the fluidity problem by the forced push of the screw system, and sets up a special mechanism for forced heat exchange.

There is another situation in production practice, the temperature of the solid material being conveyed is high or low, and it needs to be cooled or heated to meet the process requirements, such as fertilizers, cement, food additives, etc., in the production process or need Cooling for timely bagging and rapid cooling to maintain its special quality, or heating to meet special process requirements, although such materials can produce a fluid-like motion state under the action of external force, it is difficult to maintain stably. The existing screw conveying device can only convey materials, but cannot solve the aforementioned problems. In the prior art, equipment such as a fluidized bed is often used for heat exchange, but the fluidized bed type device has high energy consumption, and the heat exchange effect is not obvious, and a large amount of dust is discharged during transportation, which has an impact on the environment. It is also more serious and does not meet the requirements of current development trends and technological progress.

Although the existing screw conveyor can effectively convey solid materials, it cannot change the temperature of the conveyed material during the conveying process, so it cannot well solve the problem caused by the excessive viscosity of the material. Although the fluidized bed can solve the transportation of solid materials to a certain extent while heating, its transportation efficiency, especially the transportation of materials with high viscosity, is very difficult or even completely incompetent.

SUMMARY OF THE INVENTION

The present invention provides a high-concentration solution and solid material conveying device which can solve the problems that cannot be solved by the prior art.

The high-concentration solution and solid material conveying device with heat exchange function of the present invention also includes: a casing, a material inlet and a material outlet arranged on the casing, and a helical conveying guide arranged in the casing. The vane, the shaft for fixing the guide vane, and the bearing for fixing the guide vane shaft. The device of the present invention is provided with a heating cavity outside the casing. The starting end and the terminal end of the guide vane shaft are respectively connected with a channel and the guide vane shaft cavity. The heating medium input end and the cooled medium output end of the guide vane shaft cavity are respectively connected with the heating medium conveying pipe and the cooled medium output pipe.

In the present invention, the inner and outer jackets and their end plates form a closed cavity, and the inner jacket is the heat exchange place for the heat exchange medium and the medium to be treated; the guide vane shaft in the air and the hollow guide vane helix also form a relatively independent closed cavity. These places are used as heat exchange surfaces to participate in heat exchange. Therefore, the contact surface with the material is very large, and the heat exchange effect is obvious. During the working process, the screw shaft rotates under the drive of the frequency conversion motor, forcing the material to move forward continuously and stably. The screw conveying has low sensitivity to the material viscosity and little influence on the fluidity of the medium. The tangential flow on the leaf surface means that physical friction is constantly carried out, thus eliminating the tendency of fouling in the equipment.

The present invention can efficiently transport high-concentration solutions or solid materials, and can heat or cool the materials during the transportation process, and can also keep the materials in a proper temperature range during the transportation process. Therefore, the present invention can also be used as a An independent and complete equipment is used for conveying high-concentration solution solid stream materials and simultaneously heating or cooling the materials to meet process requirements. When the intelligent DCS control system is adopted, the normal operation parameters of the present invention are all completed by the preset program, which can greatly liberate the productivity and improve the work efficiency.

Secondly, in the present invention, the number of equipment, valves and other components is small, the control links are few, and the degree of automatic control will be higher. The guide vane shaft is driven by a variable frequency motor reducer, and the speed of the speed is used to adjust the material conveying volume and form a set coordinated working relationship between the control valves. If the operating frequency of the driving motor is changed, the feeding volume will be changed synchronously. It is necessary to provide the corresponding amount of heat source medium through the valve to match it. The operating logic parameters can be prefabricated and modified in the DCS system, and the system will automatically coordinate and match to meet the technological needs.

Description of drawings

Accompanying drawing 1 is the structural representation of the present invention,

FIG. 2 is a schematic diagram of the connection structure of the spiral guide vane and the hollow shaft in FIG. 1 .

In the figure: 1 is frequency conversion motor reducer; 2 is elastic coupling; 3 is guide vane shaft fixed bearing; 4 is hollow shaft end support; 5 is hollow shaft end seal; 6 is outer casing end plate; 7 is Outer jacket heat exchange medium outlet; 8 is the guide vane spiral hollow shaft; 9 is the material outlet; 10 is the hollow shaft heat exchange medium outlet; 11 is the inner casing end plate; 12 is the hollow shaft heat exchange medium inlet; 13 14 is the outer jacket; 15 is the hollow spiral guide vane; 16 is the inner shell; 17 is the material inlet; 18 is the motor support; 19 is the heat exchange medium control valve; 20 is the guide vane heat exchange media inlet.

Detailed ways

The present invention is explained with reference to the accompanying drawings.

The structure of the present invention is as shown in FIG. 1 , the variable frequency motor reducer 1 is connected with the guide vane helical hollow shaft 8 through the elastic coupling 2 , and both ends of the guide vane helical hollow shaft 8 are assembled on the hollow shaft end support 4 The guide vane shaft fixed bearing 3 is fixed, in order to prevent liquid leakage, a hollow shaft end seal 5 is also installed at the end of the fixed bearing. The hollow helical guide vane 15 of the present invention is fixed on the hollow shaft 8 along the helical line, and communicates with the interior of the hollow shaft through the guide vane steam inlet 20 . The hollow shaft 8 with helical guide vanes is assembled in the inner shell 16, and the inner shell 16 is provided with a material inlet 17 and a material outlet 9 at both ends of the hollow shaft. When the hollow shaft 8 rotates, it can pass through the screw shaft. The forced push from the rotation transports the material from the inlet to the outlet and out. The outer sleeve 14 is set outside the shell 16 to form a closed cavity, and the heat exchange medium enters the closed cavity of the inner and outer jackets from the medium inlet 13 of the outer jacket, and exchanges heat with the medium to be treated in the inner jacket, and the heat exchange medium is exchanged. The heated medium is discharged from the heat exchange medium outlet 7 of the outer jacket. A closed cavity is also formed between the inner jacket 16, the inner casing end plate 11 and the hollow shaft 8 of the spiral guide vane, and the heat exchange medium enters the closed cavity from the inlet 12 of the hollow shaft and passes through the hollow shaft and the hollow spiral at the same time. The outer surface of the guide vane exchanges heat with the medium to be treated, and the medium after heat exchange is discharged from the hollow shaft heat exchange medium outlet 10 .

The hollow shaft 8 of the present invention is configured as a hollow tubular structure, and the hollow helical guide vanes 15 are also in the form of hollow cores and are fixed on the hollow shaft along the helical line. There is a continuous guide vane heat exchange medium inlet 20 on the spiral line of the guide vane assembly position, see Fig. 2, so that the spiral shaft tube and the inside of the guide vane are effectively communicated, and the fresh steam enters the hollow shaft tube, and then changes through the guide vane. The heat medium inlet 20 enters into the inside of the spiral guide vane, the hollow shaft and guide vane will effectively contact the material as a heat exchange surface and generate heat exchange, the material is heated or cooled, and the medium after heat exchange is passed from the hollow shaft heat exchange medium outlet. 10 discharges.

When the present invention works, the hollow shaft is driven by the frequency conversion motor to rotate, and the material entering the screw end from the material inlet 17 is forced to move forward continuously and stably. The influence of the fluidity of the medium is also small, because the material flows tangentially along the surface of the guide vane, that is, it is constantly performing physical friction and shearing, so the tendency of scaling is eliminated. The material continuously exchanges heat with the inner jacket 16 in the process of advancing, and is finally discharged from the material outlet 9 under the push of the screw shaft. If the operating frequency of the driving motor is changed, the feeding amount will be changed synchronously. Since the present invention utilizes the rotating guide vanes to push the material to realize the material transportation, it can be used for the transportation of high-concentration and high-viscosity liquid materials, and can also be used for the transportation of solid materials.

The working state of the embodiment of the present invention for heating the conveyed material is as follows: the material to be treated is fed from the material inlet 17, the steam inlet control valve 19 on the fresh steam supply pipe is opened, the frequency conversion motor reducer 1 is started, and under the push of the screw The material tumbles and moves forward, and the fresh steam will enter the jacket empty through the hollow shaft heat exchange medium inlet 12 and the heat exchange medium from the outer jacket medium inlet 13 (at this time, 12 and I 3 are respectively the inlets of heating steam). The cavity, the hollow shaft and the inside of the guide vane conduct sufficient heat exchange with the material outside the spiral. After the material is heated and the heat is exchanged, the steam is condensed to form condensed water, which are respectively transmitted from the outer jacket heat exchange medium outlet 7 and the hollow shaft heat exchange medium outlet. 10 is discharged (at this time, 7 and 10 become condensed water outlets respectively). Adjusting the working frequency of the frequency conversion motor reducer 1, the amount of material passing through the screw changes accordingly, and the opening of the valve 19 is controlled according to the material temperature signal on the material outlet 9, which will form a coordinated and matching system logic to meet the process needs. . The system will automatically balance the incoming and outgoing amount of materials, and the system temperature will run under the set DCS parameters.

Claims (2)

1. A high-concentration solution or solid material conveying device with heat exchange function, comprising: a casing, a material inlet and a discharge port arranged on the casing, a helical conveying guide vane arranged in the casing, a fixed guide The shaft of the vane and the bearing for fixing the shaft of the guide vane are characterized in that a heating cavity is provided outside the casing, the guide vane shaft and the interior of the guide vane are both cavities, and the starting end of the guide vane cavity is The terminals are respectively connected with channels and the guide vane shaft cavity, and the heating medium input end and the cooled medium output end of the guide vane shaft cavity are respectively connected with the heating medium conveying pipe and the cooled medium output pipe. 2. A high-concentration solution or solid material conveying device with heat exchange function according to claim 1, characterized in that the guide vane shaft is driven by a frequency conversion motor reducer.

Images