CN217082527U - Steam grinding technology waste heat recovery device in titanium white powder production process - Google Patents
Steam grinding technology waste heat recovery device in titanium white powder production process Download PDFInfo
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- CN217082527U CN217082527U CN202220462654.6U CN202220462654U CN217082527U CN 217082527 U CN217082527 U CN 217082527U CN 202220462654 U CN202220462654 U CN 202220462654U CN 217082527 U CN217082527 U CN 217082527U
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Abstract
A waste heat recovery device for a steam grinding process in the production process of titanium dioxide comprises a bag filter, a high-temperature primary heat exchanger and an intermediate-temperature secondary heat exchanger, wherein an exhaust steam outlet of the steam grinding is sequentially connected with the bag filter, a cold medium inlet of the primary heat exchanger is connected with a boiler water supplement, a cold medium outlet of the primary heat exchanger is connected with a deaerator, a hot medium inlet of the primary heat exchanger is connected with the bag filter, a hot medium outlet of the primary heat exchanger is connected with a hot medium inlet of the secondary heat exchanger, a cold medium inlet of the secondary heat exchanger is connected with secondary washing water or tertiary washing water to be heated, and a cold medium outlet of the secondary heat exchanger is connected with washing process equipment. The 60-100 ℃ high-temperature hot water which can be exchanged by the primary heat exchanger is used for supplementing water to a preheating boiler, the 50-65 ℃ medium-temperature hot water which can be exchanged by the secondary heat exchanger can be further used for washing water in the titanium dioxide production process, the cascade utilization of energy is realized, the waste heat of the exhaust steam can be basically utilized, and the heat in the exhaust steam can be fully recycled.
Description
Technical Field
The utility model relates to a device of steam grinding technology exhaust steam waste heat recovery utilizes in titanium white powder production process belongs to industry waste heat recovery and utilizes field.
Background
China is a large producing country of titanium dioxide, and the current production mode of titanium dioxide in China mainly applies a sulfuric acid method, has numerous advantages, is suitable for the current national conditions of China, but has higher energy consumption in the production process. Therefore, how to effectively reduce the energy consumption of titanium dioxide production by a sulfuric acid method becomes an important research direction for titanium dioxide production enterprises.
The calcined or surface-treated titanium dioxide is all aggregates or sinter with different sizes, and the optical properties and pigment performance can be fully embodied only by crushing to the original basic raw material size (about 0.15-0.35 mu m). Titanium dioxide is an excellent white pigment, the requirements on granularity, granularity distribution and purity are very high, and the requirements are difficult to meet by common mechanical crushing equipment, so that medium-high pressure steam jet mills (namely steam grinding) are selected as final crushing equipment of the titanium dioxide at home and abroad.
The exhaust steam at the steam grinding outlet is about 100-.
SUMMERY OF THE UTILITY MODEL
In order to solve the lower problem of current steam grinding exhaust steam waste heat recovery utilization ratio, the utility model provides a steam grinding technology exhaust steam waste heat recovery utilizes device.
The technical scheme of the utility model:
a waste heat recovery device of a steam grinding process in the production process of titanium dioxide is characterized in that a dead steam outlet of steam grinding is sequentially connected with a bag filter, a high-temperature primary heat exchanger and a medium-temperature secondary heat exchanger,
the cold medium inlet of the primary heat exchanger is connected with boiler water replenishing, the cold medium outlet of the primary heat exchanger is connected with a deaerator, the hot medium inlet of the primary heat exchanger is connected with a bag filter, the hot medium outlet of the primary heat exchanger is connected with the hot medium inlet of the secondary heat exchanger, the cold medium inlet of the secondary heat exchanger is connected with secondary washing water or tertiary washing water to be heated, and the cold medium outlet of the secondary heat exchanger is connected with washing process equipment.
Preferably, the primary heat exchanger is a dividing wall type heat exchanger.
Preferably, the dividing wall type heat exchanger is a micro heat pipe array heat exchanger, exhaust steam is introduced to the heat pipe evaporation side of the micro heat pipe array heat exchanger, the exhaust steam is condensed on the surface of the micro heat pipe array to release heat, the condensation section of the micro heat pipe array heat exchanger is connected with a pipeline, and boiler water supplement heated by absorbing the exhaust steam heat conducted by the micro heat pipe array is introduced into the pipeline.
Preferably, the lower part of the micro heat pipe array heat exchanger is provided with an openable and closable type sewage draining groove, the top of the micro heat pipe array heat exchanger is provided with a washing nozzle, and one side of the openable and closable type sewage draining groove is connected with a water draining port.
Preferably, the rectangular fins are attached to two sides of the micro heat pipe array.
More preferably, the rectangular fin has a width of 10mm to 20mm and a thickness of 10mm to 50 mm.
Preferably, the dividing wall type primary heat exchanger is a shell-and-tube heat exchanger, exhaust steam is fed on a shell side, and water is supplemented on a tube side by a boiler.
Preferably, the primary heat exchanger is a spray type heat exchanger.
Preferably, the secondary heat exchanger is a spray type heat exchanger.
The technical effects of the utility model are as follows:
the utility model discloses a two-stage heat exchanger (promptly establish ties the second grade heat exchanger behind the one-level heat exchanger) is to vapour grinding technology exhaust steam waste heat recovery utilizes, the 60-100 ℃ high temperature hot water that the one-level heat exchanger can be traded out is used for preheating the boiler moisturizing, the 50-65 ℃ middle temperature hot water that the second grade heat exchanger can be traded out can further be used for the washing water in the titanium white powder production technology, wholly realizes the step utilization of the energy. The waste heat of the exhaust steam can be basically utilized completely, and the heat in the exhaust steam can be fully recycled.
The primary heat exchanger can directly preheat boiler water (desalted water) to 60-100 ℃ by using a dividing wall type heat exchanger and then enters the deaerator, so that the steam quantity for deaerating is greatly reduced, the fuel consumption of a steam boiler is reduced or the steam yield of the boiler is greatly improved; the direct spray type heat exchanger is used for transferring the heat of the exhaust steam to intermediate water, the intermediate water is heated to 60-100 ℃, then the intermediate water and boiler water supplement are subjected to heat exchange in the heat exchanger, the boiler water supplement enters the deaerator after being heated in the heat exchanger, and the steam quantity for deaerating can be also greatly reduced.
The preferable secondary heat exchanger is a spray type heat exchanger, and secondary washing water or tertiary washing water is heated to 50-60 ℃ in the secondary heat exchanger and enters a water washing process.
Because the waste steam generated in the production process of titanium dioxide contains more solid particles, the primary heat exchanger is preferably a flat micro heat pipe array heat exchanger or a shell-and-tube heat exchanger which has small resistance on the exhaust side and is not easy to block, and flushing, collecting and discharging equipment capable of removing the particles in the waste steam is arranged.
Drawings
FIG. 1 is a schematic diagram of the conventional steam grinding method in which exhaust steam is directly discharged after passing through a bag filter;
FIG. 2 is a schematic diagram of a system for recovering waste heat through a spray-type heat exchanger after dead steam of a traditional steam mill passes through a bag filter;
fig. 3 is a schematic view of embodiment 1 of the present invention for recovering waste heat of steam grinding mill by using a primary dividing wall type heat exchanger;
fig. 4 is a schematic view of a micro heat pipe array type exhaust steam waste heat recovery heat exchanger according to embodiment 1 of the present invention;
fig. 5 is a schematic diagram of the embodiment 2 of the present invention for recovering the exhaust steam waste heat of steam grinding through the spray-type heat exchanger;
the various reference numbers in the figures are listed below:
1-steam grinding; 2-bag filter; 3-a spray type heat exchanger; 4-a dividing wall type heat exchanger; 5-a secondary heat exchanger; 6-water heat exchanger, 7-deaerator, 8-openable and closable sewage discharge tank, 9-flushing nozzle, 10-water outlet, 11-micro heat pipe array, 12-exhaust steam inlet, 13-exhaust steam outlet, 14-header, 15-water side inlet and 16-water side outlet.
Detailed Description
For a clearer understanding of the present invention, reference will now be made in detail to the accompanying figures 3-5 and specific examples.
Example 1
As shown in fig. 3, in this embodiment, the high-temperature exhaust steam of the steam mill 1 firstly enters the bag filter 2, and then enters the primary dividing wall type heat exchanger 4, a cold medium inlet of the dividing wall type heat exchanger 4 is connected with boiler water supplement (demineralized water), a cold medium outlet is connected with the deaerator 7, the heat of the exhaust steam is transferred to the boiler water supplement (demineralized water), and then enters the secondary heat exchanger 5 again, and then the heat is transferred to the secondary washing water or the tertiary washing water and then is discharged outside. The desalted water is heated to 60-100 ℃ in the first-stage dividing wall type heat exchanger 4 and then enters the deaerator, so that the steam amount for deaerating is greatly reduced, and the fuel consumption of the steam boiler is reduced. The second washing water or the third washing water is heated to 50-60 ℃ in the secondary heat exchanger 5 and enters the washing process, so that the heat consumption of the heated washing water is greatly reduced, and the fuel consumption of the steam boiler is reduced.
Specifically, the dividing wall type heat exchanger 4 is a blockage-preventing and easy-to-clean micro heat pipe array type exhaust steam waste heat recovery heat exchanger, as shown in fig. 4, an openable and closable type sewage draining groove 8 is formed in the lower portion of the heat exchanger, a washing nozzle 9 is formed in the top of the heat exchanger, a water draining port 10 is connected to one side of the openable and closable type sewage draining groove, exhaust steam enters from an exhaust steam inlet 12 in the lower side of the heat exchanger, an exhaust steam outlet 13 in the upper side of the heat exchanger is discharged, heat exchange is carried out between the evaporation section of the micro heat pipe array 11 and the evaporation section of the exhaust steam, internal working media are evaporated and flow to an upper end condensation section after the evaporation section of the micro heat pipe array 11 and the evaporation section of the exhaust steam exchange, the internal working media are connected with a collecting pipe 12 for heat exchange, demineralized water in the collecting pipe 12 is heated, the exhaust steam waste heat recovery is completed, and the directions of a water side inlet 15 and a water side outlet 16 of the collecting pipe 12 are opposite to the exhaust steam flow direction.
When the exhaust steam is condensed for heat exchange, solid particles and the like fall on the openable sewage draining groove 8 through gravity, and condensed water is drained through the water draining opening 10. When certain dirt is blocked in the heat exchanger, the washing nozzle 9 above the heat exchanger is opened to wash the heat exchange core, and the washed dirt is discharged through the openable sewage discharge groove 8 at the bottom of the heat exchanger.
In order to increase the heat exchange area, rectangular fins can be attached to two sides of the micro heat pipe array 11, so that the heat exchange effect is enhanced, and the micro heat pipe array is particularly suitable for non-condensable gas contained in exhaust steam. The width of the rectangular fin is 10-20 mm, and the thickness of the rectangular fin is 10-50 mm.
Example 2
As shown in fig. 5, the difference from the embodiment lies in that in the embodiment, the high-temperature exhaust steam at the outlet of the bag filter 2 enters the first-stage spray heat exchanger 3 after entering the bag filter 2, the heat is transferred to intermediate water and then discharged outside, the cold medium inlet of the water-water heat exchanger 6 of the spray heat exchanger 3 is connected with boiler make-up water (demineralized water), the cold medium outlet is connected with the deaerator 7, the intermediate water is heated to 60-110 ℃, then exchanges heat with the boiler make-up water in the water-water heat exchanger 6, and then enters the spray heat exchanger 3 again for circulation, the boiler make-up water is heated in the water-water heat exchanger 6 and then enters the deaerator 7, the steam amount for deaerating is greatly reduced, and the fuel consumption of the steam boiler is reduced.
The above description is only a preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any modifications and the like that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (9)
1. A waste heat recovery device of a steam grinding process in the production process of titanium dioxide is characterized in that a dead steam outlet of steam grinding is sequentially connected with a bag filter, a high-temperature primary heat exchanger and a medium-temperature secondary heat exchanger,
the cold medium inlet of the primary heat exchanger is connected with boiler water replenishing, the cold medium outlet of the primary heat exchanger is connected with a deaerator, the hot medium inlet of the primary heat exchanger is connected with a bag filter, the hot medium outlet of the primary heat exchanger is connected with the hot medium inlet of the secondary heat exchanger, the cold medium inlet of the secondary heat exchanger is connected with secondary washing water or tertiary washing water to be heated, and the cold medium outlet of the secondary heat exchanger is connected with washing process equipment.
2. The apparatus of claim 1, wherein said primary heat exchanger is a dividing wall heat exchanger.
3. The device according to claim 2, wherein the dividing wall type heat exchanger is a micro heat pipe array heat exchanger, the heat pipe evaporation side of the micro heat pipe array heat exchanger is communicated with exhaust steam, the exhaust steam is condensed on the surface of the micro heat pipe array to release heat, the condensing section of the micro heat pipe array heat exchanger is connected with a pipeline, and boiler make-up water heated by absorbing the heat of the exhaust steam conducted by the micro heat pipe array is communicated into the pipeline.
4. The device of claim 3, wherein the micro heat pipe array heat exchanger has an openable and closable waste discharge tank at the lower part and a washing nozzle at the top, and a water outlet is connected to one side of the openable and closable waste discharge tank.
5. The apparatus of claim 3, wherein the micro heat pipe array is attached to rectangular fins on both sides.
6. The device of claim 5, wherein the rectangular fins have a width of 10mm to 20mm and a thickness of 10mm to 50 mm.
7. The apparatus of claim 2, wherein the dividing wall type primary heat exchanger is a shell and tube heat exchanger, the shell side is used for removing exhaust steam, and the tube side is used for removing boiler water.
8. The apparatus of claim 1, wherein the primary heat exchanger is a trickle heat exchanger.
9. The apparatus of claim 1, wherein the secondary heat exchanger is a trickle heat exchanger.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220462654.6U CN217082527U (en) | 2022-03-03 | 2022-03-03 | Steam grinding technology waste heat recovery device in titanium white powder production process |
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| CN202220462654.6U CN217082527U (en) | 2022-03-03 | 2022-03-03 | Steam grinding technology waste heat recovery device in titanium white powder production process |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114623433A (en) * | 2022-03-11 | 2022-06-14 | 淄博博一新能源科技发展有限公司 | Step recovery method and system for waste steam and waste heat of steam grinding in titanium dioxide production |
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- 2022-03-03 CN CN202220462654.6U patent/CN217082527U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114623433A (en) * | 2022-03-11 | 2022-06-14 | 淄博博一新能源科技发展有限公司 | Step recovery method and system for waste steam and waste heat of steam grinding in titanium dioxide production |
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