Water heating device for condensation of lactide

Abstract

The utility model relates to a hot water device for condensation of lactide, which adopts a normal pressure hot water circulation pipeline and is used for cooling the lactide, the normal pressure hot water circulation pipeline comprises a hot water tank, a hot water pump, a condenser and a hot water tank, the hot water tank is used as a heat source, the hot water pump is connected with the hot water tank, and the condenser is connected with the hot water pump and circularly connected into the hot water tank. And the hot water tank continuously supplies heat and supplies and outputs steam to the outside. According to the utility model, the use of a complex control system and pressure equipment when heat-conducting oil is used as a refrigerant is abandoned, and the operation difficulty, the equipment investment and the maintenance cost are reduced. The water consumption of a single cycle is only the water consumption of the supplementary water, and the normal-pressure steam generated by flash evaporation can be further utilized, so that the energy is saved, and the consumption is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of lactide cooling equipment, in particular to a hot water device for lactide condensation. Background Art

[0002] Lactide is an intermediate in the production of polylactic acid (PL), and production is typically carried out under high vacuum. At 1kPa(A), lactide has a freezing point of 95-98°C and a boiling point of 105°C. During production, lactide vapor at a high temperature (around 220°C) must be condensed.

[0003] Currently, the industry typically uses thermal oil as a refrigerant to cool lactide. After the oil circulates, it is further cooled with circulating water to remove heat. Temperature control during thermal oil circulation is very strict. Excessively high temperatures prevent lactide from condensing, while excessively low temperatures can cause the lactide to solidify, clogging equipment and impacting production. Utility Model Content

[0004] In response to the shortcomings of the above-mentioned existing production technology, the applicant provides a rationally structured hot water device for lactide condensation, which uses normal pressure hot water to replace the heat transfer oil in the existing technology, reducing the difficulty of operation while not affecting the cooling effect of lactide, and has outstanding substantial characteristics.

[0005] The technical solutions adopted in this utility model are as follows:

[0006] A hot water device for lactide condensation uses a normal pressure hot water circulation pipeline for lactide cooling. The normal pressure hot water circulation pipeline includes:

[0007] Hot water tank, as heat source,

[0008] Hot water pump, connected to the hot water tank,

[0009] The condenser is connected to the hot water pump and circulated into the hot water tank.

[0010] The lactide to be cooled is cooled by the condenser, and the hot water tank continuously supplies heat and output steam to the outside.

[0011] As a further improvement of the above technical solution:

[0012] The hot water tank is provided with a water inlet, and external supplementary water is input into the hot water tank through the water inlet.

[0013] The pressure in the hot water tank is constant at normal pressure.

[0014] The water temperature in the hot water tank is kept at a constant temperature before it is put into production.

[0015] The water temperature in the hot water tank is constantly heated to 100°C.

[0016] The water inlet works intermittently according to the changes in the liquid level inside the hot water tank.

[0017] The hot water tank, hot water pump and output steam are all in continuous working state.

[0018] The beneficial effects of the utility model are as follows:

[0019] The utility model has a compact and reasonable structure and is easy to operate, and eliminates the use of complex control systems and pressure equipment when heat transfer oil is used as a refrigerant, thereby reducing operation difficulty, equipment investment and maintenance costs.

[0020] This solution saves the circulating water usage of the original system. The water consumption of a single cycle is only the amount of water for replenishment, and the atmospheric pressure steam generated by flash evaporation can be further utilized, saving energy and reducing consumption.

[0021] Compared to conventional thermal oil heat exchange structures, this solution requires less precise temperature control. Because the maximum temperature for heating water at normal pressure is 100°C, which perfectly matches the condensation temperature of lactide, simply heating the room-temperature water to boiling ensures precise control of the lactide's cooling state within the liquid state, eliminating the generation of gaseous or solid lactide. This significantly reduces operational complexity. Furthermore, maintenance and repair of room-temperature equipment are much easier, significantly reducing production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic block diagram of the overall structure of the utility model.

[0023] Figure 2 This is a flowchart of the utility model.

[0024] Among them: 1. Condenser; 2. Hot water tank; 3. Hot water pump; 4. Make-up water; 5. Output steam. DETAILED DESCRIPTION

[0025] The specific implementation of the present utility model will be described below with reference to the accompanying drawings.

[0026] like Figure 1 As shown, the lactide condensation hot water device of this embodiment adopts a normal pressure hot water circulation pipeline for lactide cooling. The normal pressure hot water circulation pipeline includes:

[0027] Hot water tank 2, as a heat source,

[0028] Hot water pump 3, connected to hot water tank 2,

[0029] The condenser 1 is connected to the hot water pump 3 and circulates into the hot water tank 2.

[0030] The lactide to be cooled is cooled by the condenser 1, and the hot water tank 2 continuously supplies heat and supplies output steam 5 to the outside.

[0031] The hot water tank 2 is provided with a water inlet, and external supplementary water 4 is input into the hot water tank 2 through the water inlet.

[0032] The pressure in the hot water tank 2 is constant at normal pressure.

[0033] The water temperature in the hot water tank 2 is kept constant before it is put into operation.

[0034] The water temperature in the hot water tank 2 is heated to a constant temperature of 100°C.

[0035] According to the change of the liquid level inside the hot water tank 2, the water inlet works intermittently.

[0036] The hot water tank 2, the hot water pump 3 and the output steam 5 are all in a continuous working state.

[0037] The specific structure and working principle of the utility model are as follows:

[0038] The key technical feature of this utility model is that it uses common hot water instead of thermal oil, reducing operational complexity and production costs without compromising the quality of the output liquid lactide. In fact, the output quality of lactide is more stable. This invention represents a simplified solution with the same or even more significant technical effects.

[0039] like Figure 1 As shown, the normal pressure hot water circulation pipeline is connected to the hot water tank 2, the hot water pump 3, and the condenser 1 in sequence. The condenser 1 cools the gaseous lactide and liquefies it for output. The hot water with a lowered temperature after cooling returns to the hot water tank 2 for further heating. During heating, since it is heated to the boiling temperature, output steam 5 is generated at the same time, which can be used as a heat source for other working conditions. The consumed water is input into the water inlet for replenishment 4.

[0040] Before the equipment is put into operation, the water temperature in the hot water tank 2 has been heated to 100°C. During use, the hot water tank 2 is in a normal pressure state and the hot water is guaranteed to be constant at 100°C.

[0041] The utility model is simple and easy to use, has low difficulty in operation and maintenance, and has significantly lower cost than oil cooling, and has broad application prospects.

[0042] The above description is an explanation of the utility model, not a limitation of the utility model. The scope of the utility model is defined by the claims. Any form of modification can be made within the scope of protection of the utility model.

Claims

1. A hot water device for lactide condensation, characterized in that: A normal pressure hot water circulation pipeline is used for lactide cooling. The normal pressure hot water circulation pipeline includes: Hot water tank (2), as a heat source, A hot water pump (3) is connected to the hot water tank (2). The condenser (1) is connected to the hot water pump (3) and circulated to the hot water tank (2). The lactide to be cooled is cooled by the condenser (1), and the hot water tank (2) continuously supplies heat and supplies output steam (5) to the outside.

2. The lactide condensation hot water device according to claim 1, characterized in that: The hot water tank (2) is provided with a water inlet, and external supplementary water (4) is input into the hot water tank (2) through the water inlet.

3. The lactide condensation hot water device according to claim 1, characterized in that: The pressure in the hot water tank (2) is constant at normal pressure.

4. The lactide condensation hot water device according to claim 1, characterized in that: The water temperature in the hot water tank (2) is kept constant before the water is put into operation.

5. The lactide condensation hot water device according to claim 4, characterized in that: The water temperature in the hot water tank (2) is constantly heated to 100°C.

6. The lactide condensation hot water device according to claim 2, characterized in that: The water inlet works intermittently according to the change of the liquid level inside the hot water tank (2).

7. The lactide condensation hot water device according to claim 1, characterized in that: The hot water tank (2), the hot water pump (3) and the output steam (5) are all in a continuous working state.

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