Flue gas waste heat recycling device in borax production process flow

Abstract

The utility model discloses a flue gas waste heat recycling device in a borax production process flow, which is characterized in that a flue gas discharge channel is connected with a gas inlet of a fluoroplastic heat exchanger, and a gas outlet of the fluoroplastic heat exchanger is connected with a discharge chimney; the fluoroplastic heat exchanger is connected with the tubular heat exchanger through the softened water circulation system; specifically, a first water outlet of the fluoroplastic heat exchanger is connected with a second water inlet of the shell-and-tube heat exchanger, and a first water inlet of the fluoroplastic heat exchanger is connected with a second water outlet of the shell-and-tube heat exchanger; a water inlet III of the tubular heat exchanger is connected with a water inlet of a borax production system; and a water outlet of the tubular heat exchanger is connected with a water outlet of the borax production system. The device disclosed by the utility model has the advantages that the temperature of flue gas released after dust removal by the cloth bag in a boron fine powder calcining process is fully utilized; and the fluoroplastic heat exchanger is connected with the tubular heat exchanger through the softened water circulation system, so that the defect of heat exchanger failure caused by water scaling due to direct heat exchange between the fluoroplastic heat exchanger and the borax production system is overcome.

Description

Technical Field

[0001] The utility model relates to the technical field of boron processing, in particular to a heat recovery device in the process of boron processing. Background Art

[0002] In the field of boron processing technology, boron needs to be calcined in order to prepare for the boron carbonization process; the flue gas temperature released by the boron concentrate calcination process after bag dust removal is 120°C, and it is discharged after dust removal through the chimney, and the heat energy is not utilized. In order to utilize this heat energy, the existing technology often uses a simple heat exchanger to exchange heat between the water used in the borax production system and the flue gas, but because the water used in the borax production system is very easy to produce scale, the heat exchange system fails. Utility Model Content

[0003] In order to solve the above technical problems, the purpose of the utility model is to provide a flue gas waste heat recovery and utilization device in the borax production process, the flue gas discharge channel is connected to the air inlet of the fluoroplastic heat exchanger, the air outlet of the fluoroplastic heat exchanger is connected to the discharge chimney; the fluoroplastic heat exchanger is connected to the shell and tube heat exchanger through a softened water circulation system; specifically:

[0004] The water outlet 1 of the fluoroplastic heat exchanger is connected to the water inlet 2 of the shell and tube heat exchanger, the water inlet 1 of the fluoroplastic heat exchanger is connected to the water outlet 2 of the shell and tube heat exchanger; the water inlet 3 of the shell and tube heat exchanger is connected to the water inlet of the borax production system; the water outlet 3 of the shell and tube heat exchanger is connected to the water outlet of the borax production system.

[0005] A water supply interface and a drain outlet are provided on the pipeline of the softened water circulation system.

[0006] In the fluoroplastic heat exchanger, the flue gas channel and the heat exchange channel are intertwined.

[0007] The smoke exhaust channel is connected to a bag dust collector, and the bag dust collector is arranged above the boron concentrate calcining furnace.

[0008] The utility model has the advantages of making full use of the flue gas temperature released after bag dust removal during the calcination of boron concentrate; the fluoroplastic heat exchanger is connected to the tube-in-tube heat exchanger through a softened water circulation system, thus overcoming the defect of heat exchanger failure caused by water scaling caused by direct heat exchange between the fluoroplastic heat exchanger and the water in the borax production system. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a structural schematic diagram of the utility model. DETAILED DESCRIPTION

[0010] The utility model is described in detail below with reference to the accompanying drawings. As shown in the drawings, the smoke exhaust passage 3 is connected to the bag filter 2, and the bag filter is arranged above the boron concentrate calcining furnace 1.

[0011] The flue gas discharge channel 3 is connected to the air inlet 41 of the fluoroplastic heat exchanger 4, and the air outlet 42 of the fluoroplastic heat exchanger 4 is connected to the discharge chimney 7; the fluoroplastic heat exchanger 4 is connected to the shell and tube heat exchanger 5 through the softened water circulation system 6; specifically:

[0012] The water outlet 1 43 of the fluoroplastic heat exchanger 4 is connected to the water inlet 2 51 of the shell and tube heat exchanger, and the water inlet 1 44 of the fluoroplastic heat exchanger 4 is connected to the water outlet 2 52 of the shell and tube heat exchanger; the water inlet 3 54 of the shell and tube heat exchanger is connected to the water inlet 8 of the borax production system; the water outlet 3 53 of the shell and tube heat exchanger is connected to the water outlet 9 of the borax production system.

[0013] A water supply interface 61 and a water discharge port 62 are provided on the pipeline of the softened water circulation system 6 .

[0014] In order to perform heat exchange better, the flue gas channel and the heat exchange channel are alternately intertwined in the fluoroplastic heat exchanger 4 .

[0015] The principle of the utility model is that the flue gas temperature released by the bag dust removal during the calcination of boron concentrate is 120°C and is not utilized. The flue gas of the utility model enters the fluoroplastic heat exchanger and exchanges heat with softened circulating water, the flue gas temperature drops to 57°C for external discharge, and the softened water temperature rises from 40°C to 60°C for system circulation.

[0016] The temperature of softened water drops from 60℃ to 40℃ through the shell and tube heat exchanger, and the water temperature of the borax production system increases from 20℃ to 45℃ for production and use.

[0017] In the utility model, the fluoroplastic heat exchanger and the shell-and-tube heat exchanger can be commercially available products.

Claims

1. A device for recovering waste heat from flue gas in a borax production process, characterized in that: The flue gas discharge channel is connected to the air inlet of the fluoroplastic heat exchanger, and the air outlet of the fluoroplastic heat exchanger is connected to the discharge chimney; the fluoroplastic heat exchanger is connected to the shell and tube heat exchanger through a softened water circulation system; specifically: The water outlet 1 of the fluoroplastic heat exchanger is connected to the water inlet 2 of the shell and tube heat exchanger, the water inlet 1 of the fluoroplastic heat exchanger is connected to the water outlet 2 of the shell and tube heat exchanger; the water inlet 3 of the shell and tube heat exchanger is connected to the water inlet of the borax production system; the water outlet 3 of the shell and tube heat exchanger is connected to the water outlet of the borax production system.

2. The device for recovering waste heat from flue gas in the borax production process according to claim 1, characterized in that: A water supply interface and a drain outlet are provided on the pipeline of the softened water circulation system.

3. The device for recovering waste heat from flue gas in the borax production process according to claim 1, characterized in that: In the fluoroplastic heat exchanger, the flue gas channel and the heat exchange channel are intertwined.

4. The device for recovering waste heat from flue gas in the borax production process according to claim 1, characterized in that: The smoke exhaust channel is connected to a bag dust collector, and the bag dust collector is arranged above the boron concentrate calcining furnace.

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