Efficient flash evaporation waste heat recovery device

Abstract

The utility model relates to a flash evaporation waste heat efficient recovery device which comprises a flash evaporation system (7) and is characterized in that a filter outlet of the flash evaporation system (7) is connected with an inlet of an induced draft fan (2), and an air outlet of an air blower (4) is connected with an inlet of the flash evaporation system (7); a first heat exchanger (1) is arranged on an air outlet cylinder of the induced draft fan (2); a second heat exchanger (3) is arranged on an air outlet cylinder of the air blower (4); a water outlet of the first heat exchanger (1) is connected with a circulating water pipe (5), the tail end of the circulating water pipe (5) is connected with a water inlet of the second heat exchanger (3), and a water outlet of the second heat exchanger (3) is connected into a water inlet of the first heat exchanger (1) through a circulating pump (6). Waste heat of tail gas of the flash evaporation system is recycled, cold air at an inlet of the flash evaporation system is heated through recycled heat of the heat exchanger, input of a heat source of the flash evaporation system is reduced, unit consumption of natural gas per ton of products is reduced, and the energy-saving and consumption-reducing effects in winter are more obvious.

Description

TECHNICAL FIELD

[0001] The utility model belongs to titanium dioxide production supporting technology field, concretely relates to a flash evaporation residual heat efficient recovery device. BACKGROUND

[0002] In the production process of titanium dioxide finished product, the drying process mostly adopts the flash evaporation dryer as the main drying equipment, and the heat source of the flash evaporation dryer generally uses natural gas, and the consumption index is the fuel consumption per unit. The tail gas temperature of the flash evaporation dryer can reach above 100 degrees when normally running, and the existing system does not fully utilize this part of residual heat, causing energy waste. CONTENT OF THE UTILITY MODEL

[0003] The utility model aims at making up for the defects of the existing equipment, and provides a flash evaporation residual heat efficient recovery device, which saves energy and reduces the cost of enterprises.

[0004] To achieve the above-mentioned purpose, the technical scheme of the utility model is as follows: a flash evaporation residual heat efficient recovery device, comprising a flash evaporation system, characterized in that: the filter outlet of the flash evaporation system is connected with the inlet of the induced draft fan, and the air outlet of the air blower is connected with the inlet of the flash evaporation system; a first heat exchanger is arranged on the air outlet cylinder of the induced draft fan, and a second heat exchanger is arranged on the air outlet cylinder of the air blower.

[0005] The water outlet of the first heat exchanger is connected with a circulating water pipe, the end of the circulating water pipe is connected with the water inlet of the second heat exchanger, and the water outlet of the second heat exchanger is connected with the water inlet of the first heat exchanger through a circulating pump.

[0006] The outlet of the induced draft fan is connected with the discharge pipe of the flash evaporation system.

[0007] The first heat exchanger and the second heat exchanger are pipeline heat exchangers.

[0008] The medium in the circulating water pipe is desalted water.

[0009] The air inlet of the air blower is provided with a filter screen.

[0010] The utility model has the beneficial effects that the flash evaporation system tail gas residual heat is recovered, the recovered heat is used to heat the cold air at the inlet of the flash evaporation system through the heat exchanger, the input of the heat source of the flash evaporation system is reduced, the natural gas consumption per ton of product is reduced, and the energy saving and consumption reduction effect is more obvious in winter. BRIEF DESCRIPTION OF DRAWINGS

[0011] Figure 1 The utility model is a schematic diagram;

[0012] In the drawing: 1 - first heat exchanger, 2 - induced draft fan, 3 - second heat exchanger, 4 - air blower, 5 - circulating water pipe, 6 - circulating pump, 7 - flash evaporation system. DETAILED DESCRIPTION

[0013] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application.

[0014] Embodiment 1

[0015] See Figure 1 A flash heat recovery device, comprising a flash system 7, characterized in that: the filter outlet of the flash system 7 is connected with the inlet of an induced draft fan 2, and the air outlet of a blower fan 4 is connected with the inlet of the flash system 7; a first heat exchanger 1 is arranged on the air outlet pipe of the induced draft fan 2, and a second heat exchanger 3 is arranged on the air outlet pipe of the blower fan 4.

[0016] The water outlet of the first heat exchanger 1 is connected with a circulating water pipe 5, the end of the circulating water pipe 5 is connected with the water inlet of the second heat exchanger 3, and the water outlet of the second heat exchanger 3 is connected with the water inlet of the first heat exchanger 1 through a circulating pump 6.

[0017] The outlet of the induced draft fan 2 is connected with a discharge pipe of the flash system 7.

[0018] The first heat exchanger 1 and the second heat exchanger 3 are pipeline heat exchangers.

[0019] The medium in the circulating water pipe 5 is desalted water.

[0020] A filter screen is arranged on the air inlet of the blower fan 4.

[0021] Working process: the waste heat of the flash system 7 enters the induced draft fan 2 through a filter, the first heat exchanger 1 arranged on the air outlet pipe of the induced draft fan 2 absorbs the waste heat, and the heat is transmitted to the second heat exchanger 3 through the circulating water pipe 5, and the circulating pump 6 is used to accelerate the circulation of the hot water. The second heat exchanger 3 transmits the heat to the air outlet pipe of the blower fan 4, and the hot air enters the cold air inlet of the flash system 7 through the air outlet pipe of the blower fan 4, so as to preheat the cold air, thereby reducing the use amount of natural gas.

Claims

1. A flash evaporation waste heat high-efficiency recovery device, comprising a flash evaporation system (7), characterized in that: The filter outlet of the flash evaporation system (7) is connected to the inlet of the induced draft fan (2), and the air outlet of the blower (4) is connected to the inlet of the flash evaporation system (7); a first heat exchanger (1) is provided on the air outlet of the induced draft fan (2), and a second heat exchanger (3) is provided on the air outlet of the blower (4); The water outlet of the first heat exchanger (1) is connected to the circulating water pipe (5), the end of the circulating water pipe (5) is connected to the water inlet of the second heat exchanger (3), and the water outlet of the second heat exchanger (3) is connected to the water inlet of the first heat exchanger (1) through the circulating pump (6).

2. The flash evaporation waste heat efficient recovery device according to claim 1, characterized in that: The outlet of the induced draft fan (2) is connected to the discharge pipe of the flash evaporation system (7).

3. The high-efficiency flash evaporation waste heat recovery device according to claim 1, characterized in that: The first heat exchanger (1) and the second heat exchanger (3) are pipe-type heat exchangers.

4. The flash evaporation waste heat efficient recovery device according to claim 1, characterized in that: The medium in the circulating water pipe (5) is desalted water.

5. A flash evaporation waste heat high-efficiency recovery device according to claim 1, characterized in that a filter is installed at the air inlet of the blower (4).

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