CN203100463U - Waste heat recycling device for titanium dioxide calcining tail gas - Google Patents

Waste heat recycling device for titanium dioxide calcining tail gas Download PDF

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Publication number
CN203100463U
CN203100463U CN2013200509099U CN201320050909U CN203100463U CN 203100463 U CN203100463 U CN 203100463U CN 2013200509099 U CN2013200509099 U CN 2013200509099U CN 201320050909 U CN201320050909 U CN 201320050909U CN 203100463 U CN203100463 U CN 203100463U
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China
Prior art keywords
heating agent
outlet
tail gas
inlet
heat exchanger
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Expired - Lifetime
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CN2013200509099U
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Chinese (zh)
Inventor
刘小平
彭友谊
李菊香
江静
李冬双
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NANJING HUADIAN ENERGY-SAVING AND ENVIRONMENTAL PROTECTION EQUIPMENT Co Ltd
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NANJING HUADIAN ENERGY-SAVING AND ENVIRONMENTAL PROTECTION EQUIPMENT Co Ltd
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Priority to CN2013200509099U priority Critical patent/CN203100463U/en
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/25—Process efficiency
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P80/00—Climate change mitigation technologies for sector-wide applications
    • Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
    • Y02P80/15—On-site combined power, heat or cool generation or distribution, e.g. combined heat and power [CHP] supply

Abstract

The utility model relates to a waste heat recycling device for titanium dioxide calcining tail gas. The waste heat recycling device comprises a heat exchanger and an evaporator. The heat exchanger comprises a tail gas inlet, a tail gas outlet, and a heat exchange pipe located between the tail gas inlet and the tail gas outlet, wherein one end of the heat exchange pipe is a first heating medium inlet, and the other end of the heat exchange pipe is a first heating medium outlet. The evaporator comprises a water inlet, a steam outlet, and a heating medium pipe located between the water inlet and the steam outlet, wherein one end of the heating medium pipe is a second heating medium inlet, and the other end of the heating medium pipe is a second heating medium outlet. The first heating medium inlet and the second heating medium outlet are communicated, the first heating medium outlet and the second heating medium inlet are communicated, and the heat exchange pipe and the heating medium pipe form a pipeline space used for circular flow of heating media. By means of the structure, the temperature of the titanium dioxide calcining tail gas can be greatly reduced, spraying water amount during follow-up spraying is reduced, meanwhile waste heat can be effectively recycled, and energy conservation and emission reduction can be achieved.

Description

Titanium dioxide calcining using waste heat from tail gas retracting device
Technical field
The utility model relates to a kind of titanium dioxide calcining using waste heat from tail gas retracting device, belongs to the energy-conserving and environment-protective technical field.
Background technology
According to the knowledge of the applicant, in the sulfuric acid method titanium pigment production technology, the calcining tail gas main component of discharging from rotary kiln is N 2, O 2, CO 2, and a large amount of H 2O steam etc., acid mist gases such as the sulfur dioxide that containing simultaneously responds discharges, sulfur trioxide, and carry a spot of titanium white dust secretly.According to surveying and determination, when making fuel with coal gas, 1 ton of titanium dioxide of every production, the discharge tail gas amount has 15000-20000Nm approximately 3, about 400 ℃ of the temperature of tail gas; Every Nm 3The about 10g of trioxygen-containing sulphur in the tail gas, the about 0.5g of sulfur dioxide, the about 0.15g of titanium dioxide dust.
Titanium dioxide calcining exhaust temperature is very high, generally about 400 ℃, adopts the method for direct recirculated water spray desulfurization cooling at present mostly, enters follow-up equipments such as scrubbing tower after making tail gas be cooled to 60～70 ℃ again.But this processing method can cause a large amount of heat wastes, and heat can not get effective utilization.Simultaneously, because the tail gas water capacity is big, and contains acid mist gas, oxysulfide, titanium dioxide dust etc., cooling system had very strong corrosivity; If directly this tail gas is carried out waste heat recovery, be used for producing steam or heat production water etc., there is very big dew point corrosion risk; But if the heating surface temperature of waste heat recovery apparatus is controlled at more than the acid dew point, then exhaust temperature can only drop to about 330 ℃, UTILIZATION OF VESIDUAL HEAT IN is insufficient, and when titanium white production was used the kiln load fluctuation, still there was the risk of dew point corrosion in heat transmission equipment.
The utility model content
The purpose of this utility model is: at the problem that above-mentioned prior art exists, provide a kind of titanium dioxide calcining using waste heat from tail gas retracting device, can avoid occurring dew point corrosion, using waste heat from tail gas is fully used.
In order to reach above purpose, the technical solution of the utility model is as follows:
Titanium dioxide calcining using waste heat from tail gas retracting device comprises heat exchanger and evaporimeter; It is characterized in that described heat exchanger is provided with gas inlet, tail gas outlet and the heat exchanger tube between gas inlet and tail gas outlet, an end of described heat exchanger tube is that first heating agent inlet, the other end are the outlet of first heating agent; Described evaporimeter is provided with water inlet, steam (vapor) outlet and the heat medium pipe between water inlet and steam (vapor) outlet, and an end of described heat medium pipe is that second heating agent inlet, the other end are the outlet of second heating agent; Described first heating agent inlet is communicated with the outlet of second heating agent, and described first heating agent outlet is communicated with second heating agent inlet, and described heat exchanger tube and heat medium pipe form the pipeline space that the heat supply matchmaker circulates.
The further technical scheme of the utility model is as follows:
Preferably, also comprise the bypass line that is communicated with outlet of second heating agent and second heating agent inlet, described bypass line is provided with flow controller, and described flow controller has first temperature-sensing probe that detects the first heating agent porch heat medium temperature and second temperature-sensing probe that detects tail gas exit exhaust temperature.
Preferably, described heat exchanger is upright tubular, and described gas inlet, tail gas outlet lay respectively at upper end, the lower end of heat exchanger; Described heat exchanger tube turntable around, described first heating agent inlet, the outlet of first heating agent all are positioned at the heat exchanger side, and described first heating agent inlet is positioned at the below of first heating agent outlet.
Preferably, the water inlet of described evaporimeter is positioned at the evaporimeter lower side, and described steam (vapor) outlet is positioned at the evaporimeter top; Second heating agent inlet of described heat medium pipe is positioned at the below of second heating agent outlet.
Preferably, described evaporimeter also is provided with the heating agent that is communicated with outlet of first heating agent and second heating agent inlet and enters the chamber, is communicated with the heating agent that the outlet of second heating agent and first heating agent enter the mouth and goes out the chamber, and described heating agent enters the chamber and is positioned at the below that heating agent goes out the chamber.
Preferably, described base of evaporator also is provided with sewage draining exit.
Preferably, described first heating agent inlet is communicated with the outlet of second heating agent through first pipeline, and described first heating agent outlet is communicated with second heating agent inlet through second pipeline, and described first pipeline or second pipeline are provided with the heating agent pump.
The utility model adopts split-type structural, heating agent circulates in heat exchanger and evaporimeter, to be used to add hot water from the heat that tail gas absorbs and form steam,, can when guaranteeing to make full use of using waste heat from tail gas, avoid occurring dew point corrosion as long as the control heat medium temperature is higher than the tail gas dew-point temperature.After adopting structure of the present utility model, titanium dioxide calcining exhaust temperature is greatly reduced, can reduce the injection flow rate of follow-up spray, the while is recovery waste heat effectively, realizes energy-saving and emission-reduction.
Description of drawings
Below in conjunction with accompanying drawing the utility model is further described.
Fig. 1 is the structural representation of the utility model embodiment.
The specific embodiment
Embodiment
The titanium dioxide calcining using waste heat from tail gas retracting device of present embodiment comprises heat exchanger 1 and evaporimeter 2 as shown in Figure 1; Heat exchanger 1 is provided with gas inlet 1-1, tail gas outlet 1-2 and the heat exchanger tube 1-3 between gas inlet 1-1 and tail gas outlet 1-2, and the end of heat exchanger tube 1-3 is that first heating agent inlet 3-1, the other end are first heating agent outlet 3-2; Evaporimeter 2 is provided with water inlet 4-1, steam (vapor) outlet 4-2 and the heat medium pipe 4-3 between water inlet 4-1 and steam (vapor) outlet 4-2, and the end of heat medium pipe 4-3 is that second heating agent inlet 5-1, the other end are second heating agent outlet 5-2; First heating agent inlet 3-1 is communicated with second heating agent outlet 5-2, and first heating agent outlet 3-2 is communicated with second heating agent inlet 5-1, and heat exchanger tube 1-3 and heat medium pipe 4-3 form the pipeline space that the heat supply matchmaker circulates.Like this, heating agent circulates in the pipeline space of heat exchanger tube 1-3 and heat medium pipe 4-3 formation, will be used to add hot water from the heat that tail gas absorbs and form steam; Owing to adopt split-type structural,, can when guaranteeing to make full use of using waste heat from tail gas, avoid occurring dew point corrosion as long as the control heat medium temperature is higher than the tail gas dew-point temperature.
Also comprise the bypass line 6 that is communicated with second heating agent outlet 5-2 and second heating agent inlet 5-1, bypass line 6 is provided with flow controller 6-1, and flow controller 6-1 has first temperature-sensing probe 6-2 that detects first heating agent inlet 3-1 place heat medium temperature and the second temperature-sensing probe 6-3 that detects tail gas outlet 1-2 place exhaust temperature.Like this, flow controller 6-1 can be according to the comparative result of first heating agent inlet 3-1 place heat medium temperature, tail gas outlet 1-2 place's exhaust temperature and predetermined temperature, regulate the heating agent shunt volume of bypass line 6, and then adjusting enters the heating agent flow of heat exchanger heat-exchanging tube 1-3, the heat-transfer surface tube wall temperature of heat exchanger heat-exchanging tube 1-3 is remained at more than the tail gas dew-point temperature, effectively avoid occurring dew point corrosion further.
In addition, heat exchanger 1 is upright tubular, and gas inlet 1-1, tail gas outlet 1-2 lay respectively at upper end, the lower end of heat exchanger 1; Heat exchanger tube 1-3 turntable all is positioned at heat exchanger 1 side around, first heating agent inlet 3-1, first heating agent outlet 3-2, and first heating agent inlet 3-1 is positioned at the below of first heating agent outlet 3-2.
The water inlet 4-1 of evaporimeter 2 is positioned at evaporimeter 2 lower side, and steam (vapor) outlet 4-2 is positioned at evaporimeter 2 tops; Second heating agent inlet 5-1 of heat medium pipe 4-3 is positioned at the below of second heating agent outlet 5-2.
Evaporimeter 2 is provided with also that the heating agent that is communicated with first heating agent outlet 3-2 and second heating agent inlet 5-1 advances chamber 7-1, the heating agent that is communicated with second heating agent outlet 5-2 and first heating agent inlet 3-1 goes out chamber 7-2, and heating agent advances chamber 7-1 and is positioned at the below that heating agent goes out chamber 7-2.
Evaporimeter 2 bottoms also are provided with sewage draining exit 4-4.
First heating agent inlet 3-1 is communicated with second heating agent outlet 5-2 through first pipeline 8, and first heating agent outlet 3-2 is communicated with second heating agent inlet 5-1 through second pipeline 9, and first pipeline 8 or second pipeline 9 are provided with heating agent pump 10.
During use, in heat exchanger 1, exhaust temperature is cooled to about 280 ℃ by about 400 ℃, can enter recirculated water spray desulfurization cooling then; Simultaneously, heating agent is heated to about 280 ℃ by about 250 ℃, and enters evaporimeter 2.In evaporimeter 2, heating agent heat release cooling, the heat absorption of evaporimeter inner cold water becomes the outer confession of steam, and the heating agent after the cooling enters once more in the heat exchanger 1 and absorbs heat.So circulation promptly realizes the recycling to titanium dioxide calcining using waste heat from tail gas.
The titanium dioxide calcining exhaust temperature of handling through the present embodiment device greatly reduces, and can reduce the injection flow rate of follow-up spray, and the while is recovery waste heat effectively, realizes energy-saving and emission-reduction.
In addition to the implementation, the utility model can also have other embodiments.All employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop on the protection domain of the utility model requirement.

Claims (7)

1. titanium dioxide calcining using waste heat from tail gas retracting device comprises heat exchanger and evaporimeter; It is characterized in that described heat exchanger is provided with gas inlet, tail gas outlet and the heat exchanger tube between gas inlet and tail gas outlet, an end of described heat exchanger tube is that first heating agent inlet, the other end are the outlet of first heating agent; Described evaporimeter is provided with water inlet, steam (vapor) outlet and the heat medium pipe between water inlet and steam (vapor) outlet, and an end of described heat medium pipe is that second heating agent inlet, the other end are the outlet of second heating agent; Described first heating agent inlet is communicated with the outlet of second heating agent, and described first heating agent outlet is communicated with second heating agent inlet, and described heat exchanger tube and heat medium pipe form the pipeline space that the heat supply matchmaker circulates.
2. according to the described titanium dioxide calcining of claim 1 using waste heat from tail gas retracting device, it is characterized in that, also comprise the bypass line that is communicated with outlet of second heating agent and second heating agent inlet, described bypass line is provided with flow controller, and described flow controller has first temperature-sensing probe that detects the first heating agent porch heat medium temperature and second temperature-sensing probe that detects tail gas exit exhaust temperature.
3. according to the described titanium dioxide calcining of claim 2 using waste heat from tail gas retracting device, it is characterized in that described heat exchanger is upright tubular, described gas inlet, tail gas outlet lay respectively at upper end, the lower end of heat exchanger; Described heat exchanger tube turntable around, described first heating agent inlet, the outlet of first heating agent all are positioned at the heat exchanger side, and described first heating agent inlet is positioned at the below of first heating agent outlet.
4. according to the described titanium dioxide calcining of claim 3 using waste heat from tail gas retracting device, it is characterized in that the water inlet of described evaporimeter is positioned at the evaporimeter lower side, described steam (vapor) outlet is positioned at the evaporimeter top; Second heating agent inlet of described heat medium pipe is positioned at the below of second heating agent outlet.
5. according to the described titanium dioxide calcining of claim 4 using waste heat from tail gas retracting device, it is characterized in that, described evaporimeter also is provided with the heating agent that is communicated with outlet of first heating agent and second heating agent inlet and enters the chamber, is communicated with the heating agent that the outlet of second heating agent and first heating agent enter the mouth and goes out the chamber, and described heating agent enters the chamber and is positioned at the below that heating agent goes out the chamber.
6. according to the described titanium dioxide calcining of claim 5 using waste heat from tail gas retracting device, it is characterized in that described base of evaporator also is provided with sewage draining exit.
7. according to each described titanium dioxide calcining using waste heat from tail gas retracting device of claim 1-6, it is characterized in that, described first heating agent inlet is communicated with the outlet of second heating agent through first pipeline, described first heating agent outlet is communicated with second heating agent inlet through second pipeline, and described first pipeline or second pipeline are provided with the heating agent pump.
CN2013200509099U 2013-01-30 2013-01-30 Waste heat recycling device for titanium dioxide calcining tail gas Expired - Lifetime CN203100463U (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103756692A (en) * 2014-02-14 2014-04-30 南京华电节能环保设备有限公司 Riser waste heat recovery device for coke oven
CN103822514A (en) * 2014-02-17 2014-05-28 南京华电节能环保设备有限公司 Circular-pipe-separation type heat pipe exchanger
CN104764338A (en) * 2015-03-19 2015-07-08 南京华电节能环保设备有限公司 Heat pipe type smoke pulverized coal heating device
CN104990429A (en) * 2015-07-30 2015-10-21 广东拉多美化肥有限公司 Novel mixing boiler adhered material-removing device

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103756692A (en) * 2014-02-14 2014-04-30 南京华电节能环保设备有限公司 Riser waste heat recovery device for coke oven
CN103756692B (en) * 2014-02-14 2015-11-25 南京华电节能环保设备有限公司 Riser waste heat recovery device for coke oven
CN103822514A (en) * 2014-02-17 2014-05-28 南京华电节能环保设备有限公司 Circular-pipe-separation type heat pipe exchanger
CN104764338A (en) * 2015-03-19 2015-07-08 南京华电节能环保设备有限公司 Heat pipe type smoke pulverized coal heating device
CN104990429A (en) * 2015-07-30 2015-10-21 广东拉多美化肥有限公司 Novel mixing boiler adhered material-removing device

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Granted publication date: 20130731