DD156167A1 - HEATING AND COOLING CIRCUIT OF FAST MIXING MACHINE COMBINATIONS - Google Patents

Abstract

The invention is applicable to high speed blender combinations for the treatment of PVC. The aim and task is to reduce energy consumption and losses by supplying the heat removed from the cooling mixer to the process of heating in the heating mixer. According to the invention, this is achieved by d. via a heat pump, consisting of evaporator u. Liquefier, d. Coolant d. Kuehlmischers d. Heat removed from u. for preheating d. Starting materials is used. The invention is generally applicable to all machine combinations consisting of heating and cooling machines.

Description

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Title of the invention

Heating and cooling circuit on high-speed mixer combinations

Field of application of the invention

The invention is applicable to high-speed mixer combinations consisting of heating and cooling mixer for the treatment of PVC.

Characteristic of the known technical solutions

; Known technical solutions include high-speed mixing machine combinations, comprising heating and cooling mixer in which the process-induced heat in Heizmi- y shear is generated by friction and by jacket heating from the outside, and so on by agglomeration of the PVC powder with the additives such as plasticizers, colors, The agglomerate is cooled in the cooling mixer to ensure its shelf-life · The cooling takes place mainly via the coolant-flowed double walls of the cooling mixer vessel and the bottom. The coolant flows through the double jacket, cools the container jacket and the mix and heats up. "In this process, powers up to approx. 150 kW are destroyed in relatively short cycle times by heating the mix in the heating mixer up to 16 ° C subsequently

cooled in the cooling mixer to about 30 C and below

is, wherein the amount of heat generated by friction largely via the coolant, for. B · Water that is fed to the environment and lost. The mixing process is thus a continuous process of generating and eliminating heat energy,

Object of the invention

The aim of the invention is to reduce the energy expenditure for heating and cooling capacities and energy losses.

Explanation of the essence of the invention

The object of the invention is to partially supply the heat extracted from the agglomerate in the cooling mixer to the process of the heating mixer.

According to the invention this is achieved in that the heat removed from the heated coolant from the cooling mixer and used for preheating the starting materials of the heating mixer ·

The coolant, which warms up in the cooling jacket of the cooling mixer, is fed directly or indirectly via a surge tank in positively driven circulation of a heat pump consisting of evaporator and condenser, with direct feed the double jacket of the cooling mixer serves as a surge tank «About the condenser of the heat pump the amount of heat withdrawn from the coolant is fed to a heating circuit for preheating the mixing components. "

The preheating of powdered mixed components can be carried out by Y / poor transmission by means of double jacket in the conveyor and / or in the weighing and metering "Furthermore, there is the possibility, in particular in a pneumatic conveyor, the conveying means to preheat air through a heat exchanger, whereby a

direct heat transfer between funding and mixing component is possible. In this case, however, a correspondingly sized cyclone for the deposition of the powdery mixed component with corresponding filter means for the air to be discharged is provided. The preheating of liquid components is possible with the help of a special preheating tank, which has a double jacket or special V / ärmeregister and the component to ensure a favorable heat transfer is kept in motion · The heat transfer medium can directly or via a surge tank from the condenser of the heat pump the preheating be fed

embodiment

In the drawings, the heating and cooling circuits of the invention are shown »show in:

Fige 1 mixing machine combination and heat pump with indirect heat transfer at the conveyor;

Fig. 2 mixing machine combination and heat pump with heat transfer via a preheating container to a liquid component; .._.

Fig. 3 mixing machine combination and heat pump with direct heat transfer in

pneumatic conveyor ·

A rapid mixing machine combination consisting of heating mixer 1 and cooling mixer 2, a cooling circuit 5 is connected, which consists of a surge tank 4, the double jacket 3 of the cooling mixer 2, "a surge tank 4 'and piping.

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container 4, the cooling liquid is pumped into the double jacket 3 of the cooling mixer 2, when passing through the double jacket 3, it is heated and is further promoted in the expansion tank 4 ¹ . Via a pump 6 and a separate fluid circuit, the coolant from the reservoir tank 4 ^! back into the expansion tank 4 ·, wherein the heated cooling liquid passes through the evaporator 7 of a heat pump 8. The evaporator 7 withdraws the heat flowing through the heat the heat «contained in the evaporator 7 liquid evaporates with low boiling point and enters the condenser 9 of the heat pump 8, where it is transferred to the liquid state * Yförme is free, which is connected to a separate heating circuit 10th is discharged and the liquid in the heating circuit 10 is heated. The heating circuit 10 can according to FIG. 1 by a double jacket 11 of a conveyor 12, the powdered mix from the silo 13 transported to the Y / äge- and metering 14 · run. The mixed material transported in the conveyor 12 is preheated

An embodiment variant according to FIG. 2 also consists in preheating the liquid component or the plasticizer. The liquid component, before it is introduced into the heating mixer 1, stored in a mixing vessel 15, in which preferably a stirring device 17 is located for moving the liquid component and which is surrounded by a double jacket 16. In the heating circuit 10, the mixing container 15 is enclosed, in which the heated liquid flows through the double jacket 16 of the mixing container 15 and thus heats the liquid component in the mixing container 15. The preheated component is added to the heating mixer 1 via a metering device 18.

A further embodiment variant is shown in FIG. In this variant is in the heating circuit 10th

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a heat exchanger 19 is arranged. A pneumatic conveying stream 21 is sent through the heat exchanger 19 via a blower 20. The flow 21 v / ird is heated, with which then the powdered mixed component is transported in a conveyor 12 from the silo 13 to the weighing and metering device 14 and thereby preheated ·

In this case, a cyclone 22 and for cleaning the pneumatic conveying material for the separation of the pulverulent mixed material.

13Ö derstromes 21 to provide a filter 23.

The conveyor 12 is connected to a cyclone 22, in which by air vortices the powdery mix from the flow 21 separated v / ird · While the powdery mix falls into the weighing and metering device 14, the flow 21 is passed into a filter 23 for cleaning.

Claims (3)

invention claim 1 # Heating and cooling circuit on high-speed mixer combinations for the treatment of PVC powder, in which the mix is heated in the heating mixer by friction or additionally by jacket heating and cooled in the cooling mixer by cooling with forced circulation of the coolant in the double jacket of the cooling mixer, characterized in that the cooling circuit (5) of the cooling mixer (2) consists of an expansion tank (4) which is connected via a pipeline to the double jacket (3) of the cooling mixer (2) and which via pipes to an expansion tank (4 ¹ ). the expansion tank (4 ¹ ) via pipes by means of a pump (6) with the surge tank (4) is connected and in this circuit, a heat pump (8) is arranged, which consists of an evaporator (7) and a condenser (9), v / obei the pipeline from the expansion tank (4 ¹ ) with the heated coolant through the evaporator (7) and through the condenser (9) a e pipeline of a separate heating circuit (10) leads, in a double jacket (11) of a conveyor (12) for the transport powdery !. Mixing material flows into the heating mixer. 2 · Heating and cooling circuit according to item 1, characterized in that a heat exchanger (19) is arranged in the heating circuit (10) and a blower (20) is produced in the blower (20). ter pneumatic flow (21) through the heat exchanger (19) in the conveyor (12) leads. 3 · Heating and cooling circuit according to item 1, characterized in that the heating circuit (10) leads through or via a double jacket (16) of a mixing container (15) for the liquid mixing component. For this A rare drawings