CN208779478U - A kind of blast furnace gas boiler fume afterheat deep exploitation device - Google Patents
A kind of blast furnace gas boiler fume afterheat deep exploitation device Download PDFInfo
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- CN208779478U CN208779478U CN201821410953.5U CN201821410953U CN208779478U CN 208779478 U CN208779478 U CN 208779478U CN 201821410953 U CN201821410953 U CN 201821410953U CN 208779478 U CN208779478 U CN 208779478U
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- gas
- blast furnace
- fume afterheat
- boiler fume
- deep exploitation
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/30—Technologies for a more efficient combustion or heat usage
Abstract
The utility model discloses a kind of blast furnace gas boiler fume afterheat deep exploitation devices, belong to energy-conserving and emission-cutting technology field.The blast furnace gas boiler fume afterheat deep exploitation device of the utility model, including gas passage and exhaust gases passes, it is provided with gas preheater in the gas passage and exhaust gases passes, low-level (stack-gas) economizer is provided in the exhaust gases passes, the flue gas enters low-level (stack-gas) economizer after gas preheater.The utility model can use flexible and changeable regulating measure, and reliable performance, the flue-gas temperature range of decrease is obvious, realizes the complementation of gas preheater and low-level (stack-gas) economizer performance, has not only realized increasing substantially for boiler efficiency, but also be effectively protected equipment.
Description
Technical field
The utility model belongs to energy-conserving and emission-cutting technology field, and in particular to a kind of blast furnace gas boiler fume afterheat depth benefit
Use device.
Background technique
Boiler exhaust gas loss is steam power plant energy loss rich and influential family, and exhaust gas temperature is every to increase 10~15 DEG C, the heat loss of boiler
Reduce about 1% or so.Therefore, the depth UTILIZATION OF VESIDUAL HEAT IN of boiler exhaust gas plays the role of raising unit efficiency vital.?
Under the premise of guaranteeing unit safety, economy, reliability service, existing residual heat system potentiality are sufficiently excavated, the performance of unit is improved, dropped
Low energy consumption, economic benefit and social benefit are significant.
At this stage, domestic steel industry blast furnace gas boiler outlet exhaust gas temperature control is not perfect condition, leads to pot
Furnace operational efficiency is lower.Currently, the technology generally used is to install blast furnace gas preheating additional in boiler tail air preheater outlet
Device improves the charging temperature (150~180 DEG C) of blast furnace gas, improves the combustion of blast furnace gas while reducing exhaust gas temperature
Burn effect.Since gas preheater gas inlet temperature is higher (40~60 DEG C), gas --- the coefficient of heat transfer of gas heat exchange is relatively
It is small, and in order to avoid heat exchanger tube dew point corrosion, flue gas cool-down effect is subject to certain restrictions, based on the reasons such as above-mentioned, boiler row
Cigarette temperature drift, generally 135~155 DEG C, UTILIZATION OF VESIDUAL HEAT IN is not enough, and the thermal efficiency is low.
Summary of the invention
The utility model aim be to provide one kind can be improved boiler afterheat utilization efficiency and can flexible modulation smoke evacuation temperature
The blast furnace gas boiler fume afterheat deep exploitation device of degree.
Specifically, the utility model provides a kind of blast furnace gas boiler fume afterheat deep exploitation device, including coal
Gas channel and exhaust gases passes are provided with gas preheater, setting in the exhaust gases passes in the gas passage and exhaust gases passes
There is low-level (stack-gas) economizer, the flue gas enters low-level (stack-gas) economizer after gas preheater.
Furthermore, the low-level (stack-gas) economizer includes an at least radial disbalance heat pipe, and cold flow liquid is from radial disbalance
One end of heat pipe enters, and flows out from the other end of radial disbalance heat pipe.
Furthermore, the radial disbalance heat pipe includes inner tube, casing, is vacuum environment between casing and inner tube, and fill
There is working medium, cold flow liquid is flowed in inner tube.
Furthermore, described sleeve pipe is placed in exhaust gases passes, and flue gas laterally skims over described sleeve pipe.
Furthermore, described sleeve pipe is equipped with fin.
Furthermore, the regulating valve for adjusting cold flow fluid flow is provided on the low-level (stack-gas) economizer.
Furthermore, the gas preheater includes an at least high efficient heat exchanging element.
Furthermore, the high efficient heat exchanging element is gravity assisted heat pipe, and the gravity assisted heat pipe includes heat pipe base tube, the heat
Pipe base tube is equipped with fin.
Furthermore, the gas preheater is provided with partition, and the gravity assisted heat pipe is divided into coal gas by the partition
Side and fume side.
Furthermore, the gas preheater is provided with coal gas bypass regulator valve.
Furthermore, the blast furnace gas boiler fume afterheat deep exploitation device is provided with soot blower.
The beneficial effects of the utility model are as follows: gas preheater and low-level (stack-gas) economizer is arranged simultaneously in gas boiler tail portion,
The combination unit for foring fume afterheat deep exploitation, using flexible and changeable regulating measure, reliable performance, the flue-gas temperature range of decrease
Obviously, the complementation of gas preheater and low-level (stack-gas) economizer performance is realized, has not only realized increasing substantially for boiler efficiency, but also have
Equipment is protected to effect, equipment long period is maintained and effectively runs.Its characteristics are as follows:
(1) gas preheater and low-level (stack-gas) economizer are all made of heat pipe heat exchanging component, both realize flue gas --- coal gas, cigarette
Gas --- the high efficient heat exchanging of cold flow liquid (such as condensed water) also ensures the sealing effect between cold fluid and hot fluid.
(2) flue gas is utilized --- the higher coefficient of heat transfer of condensed water and the suitable temperature difference, by the heat of low-temperature flue gas into one
Step is absorbed and utilized, and realizes the recycling of fume afterheat gradient, exhaust gas temperature is minimized.
(3) by setting low-level (stack-gas) economizer, steam turbine condensed water is heated, continues the waste heat in recovered flue gas, realizes flue gas
Waste heat deep exploitation；Meanwhile entering boiler feed after condensed water heating, steam turbine steam extraction amount is reduced, generating set is improved
Power output.
(4) even if occurring, gas preheater heat pipe ash is stifled, a small amount of heat pipe failure of burn into, so that gas preheater performance has
Declined, gas preheater equipment flue gas exit temperature increases, and by the water of adjusting (increase) condensed water, can equally reduce
Exhaust gas temperature guarantees boiler efficiency.
(5) for boiler at low load, when boiler tail flue gas temperature is lower, other than adjusting coal gas bypass flow, low temperature
The flow of economizer condensed water can also be adjusted, and equipment is avoided to generate dew point corrosion, regulating measure flexibility and reliability.
Detailed description of the invention
Fig. 1 is the blast furnace gas boiler fume afterheat deep exploitation schematic device of the utility model embodiment one.
Fig. 2 is the gravity assisted heat pipe schematic diagram of the utility model embodiment one.
Fig. 3 is the radial disbalance heat pipe schematic diagram of the utility model embodiment one.
Fig. 4 is the face A-A cross-sectional view in Fig. 3.
Label in figure: 1- gas inlet, 2- gas preheater, 3- flue gas linkage section, 4- low-level (stack-gas) economizer, 5- condensed water
Flow control valve, 6- exhanst gas outlet, 7- gas inlet, 8- coal gas bypass regulator valve, 9- gas exit, 10- soot blower, 11- weight
Power heat pipe, 12- partition, 13- heat pipe base tube, 14- coal gas side fin, 15- fume side fin, 16- radial disbalance heat pipe, 17- set
Pipe, 18- inner tube (condensate pipe), 19- fin, 20- working medium, 21- condense water inlet, and 22- condenses water out, 23- gas pipe.
Specific embodiment
The utility model is described in further detail below with reference to embodiment and referring to attached drawing.
Embodiment one:
One embodiment of the utility model is a kind of blast furnace gas boiler fume afterheat deep exploitation device.
As shown in Figure 1, blast furnace gas boiler tail portion is equipped with blast furnace gas boiler fume afterheat deep exploitation device, blast furnace
Gas boiler fume afterheat deep exploitation device includes gas passage (on Fig. 1 shown in part) and parallel arrangement of with gas passage
Exhaust gases passes (under Fig. 1 shown in part) are provided with gas preheater 2, setting in exhaust gases passes in gas passage and exhaust gases passes
There is low-level (stack-gas) economizer 4.The flue gas of gas boiler tail portion discharge is the relatively high high-temperature flue gas of temperature, and high-temperature flue gas enters flue gas
After import 1, is successively handled by the level-one cooling processing and the second level cooling of low-level (stack-gas) economizer 4 of gas preheater 2, form low temperature
Flue gas, low-temperature flue gas are discharged from exhanst gas outlet 6.Wherein, while gas preheater 2 carries out level-one cooling processing, due to heat exchange
Effect, blast furnace gas are heated by gas preheater 2；Due to being provided with low-level (stack-gas) economizer 4, condensed water is by flue gas.Therefore, cigarette
Gas waste heat is fully used, and boiler thermal efficiency increases substantially.
Gas preheater 2 in the present embodiment is preferably integral heat-tube heat exchanger, including shell, heat-pipe elements, partition
And cold and hot fluid inlet and outlet connectors.Shell is a steel construction piece, and side is zone of heat liberation, and the other side is cold fluid pass, in
Between separated by tube sheet.Its main feature can be effectively prevented from the crossfire of cold and hot fluid, and heat pipe is all relatively independent closed list
Member, cold and hot fluid all flow outside pipe, and are closely separated cold and hot fluid by intermediate seal plate, so that coal gas and flue gas are not
It mutually alters, it is ensured that the operational safety of gas preheater.
The structure of gas preheater 2 is as shown in Fig. 2, be internally provided with more high efficient heat exchanging elements, i.e. gravity assisted heat pipe 11.Weight
Power heat pipe 11 includes the heat pipe base tube 13 for being arranged in partition 12, and wherein the heat pipe base tube 13 of side is located in gas passage, another
The heat pipe base tube 13 of side is located in exhaust gases passes.The quantity of gravity assisted heat pipe 11 depends on the size of heat exchange amount.Preferably, in order to mention
Coal gas side fin 14 can be arranged in the gas converting heat coefficient of high gravity assisted heat pipe 11 outside the heat pipe base tube 13 in gas passage,
Fume side fin 15 is set outside the heat pipe base tube 13 in exhaust gases passes, gravity assisted heat pipe number required for which can greatly reduce
Amount.The heat of flue gas passes to rapidly the coal gas in gas passage by gravity assisted heat pipe 11.It is arranged between fume side and coal gas side
Partition 12, it is ensured that flue gas is not altered mutually with coal gas.By adjusting heat pipe fin (coal gas side fin 14 and/or fume side fin
15) heat transfer area ratio, makes the wall temperature of gravity assisted heat pipe 11 be increased to dew-point temperature or more, is effectively prevented and changes gravity assisted heat pipe 11
Dew point corrosion occurs for tube wall.As shown in Figure 1, fume side and coal gas side install soot blower 10 additional, and to prevent dust stratification by adjusting weight
The arrangement of power heat pipe 11 guarantees that fluid reaches the flow velocity from deashing between pipe.It, can be by soot blower in order to be better protected from dust stratification
10 are arranged close at gas preheater 2 and low-level (stack-gas) economizer 4.It is appreciated that soot blower 10 also may be mounted at gas preheating
On the shell of device 2 and low-level (stack-gas) economizer 4.
The temperature of blast furnace gas boiler gas inlet is up to 220 DEG C or so under normal circumstances.It is preheated by setting blast furnace gas
Flue-gas temperature can be down to 145 DEG C hereinafter, fume afterheat obtains Preliminary Exploitation by 220 DEG C or so by device.Meanwhile by coal gas temperature
Degree is preheated to 150~180 DEG C from 40~60 DEG C, effectively improves the combustion position of the blast furnace gas of low heat value.But the flue gas
Outlet temperature is higher, and fume afterheat still has the space further utilized.
As shown in Figure 1, the efficiency of boiler controller system is improved, in gas preheating to further decrease temperature at exhanst gas outlet 6
It is additionally arranged low-level (stack-gas) economizer 4 after device 2, for heating steam turbine condensed water, continues the waste heat in recovered flue gas, realizes that fume afterheat is deep
Degree utilizes.Meanwhile condensed water enters low-level (stack-gas) economizer from condensation water inlet 21, flows out after heated from condensation water out 22, into
Enter boiler feed, reduces steam turbine steam extraction amount, improve the power output of generating set.It is recognised that condensed water can also be replaced
For low temperature (such as 50 degree) water supply or other fluids of low temperature, enter low-level (stack-gas) economizer from condensation water inlet 21, after heated
It is flowed out from condensation water out 22.
As shown in figure 3, low-level (stack-gas) economizer 4 is composed of more radial disbalance heat pipes 16,16 conduct of radial disbalance heat pipe
Heat exchange element in low-level (stack-gas) economizer 4.Single branch radial disbalance heat pipe 16 includes inner tube 18 and casing 17, between inner tube 18 and casing 17
For vacuum environment, and filled with working medium 20.
As shown in Figure 3 and Figure 4, the heating section (part of casing 17) of radial disbalance heat pipe 16 is placed in exhaust gases passes, cigarette
Gas laterally skims over casing 17, the working medium 20 in heating muff 17, and heat promptly passes to inner tube 18 by working medium 20, and heating is solidifying
It bears water.Inner tube (condensate pipe) 18 does not contact flue gas, and every no-welding-seam in box heat exchanger of radial disbalance heat pipe 16, avoids
The leakage of condensed water.For the heat of flue gas by radial disbalance heat pipe indirect heating condensed water, flue gas is completely separated with water supply, keeps away
Exempt from a possibility that water supply of low-level (stack-gas) economizer is bled into flue, is effectively prevented from the crossfire of cold and hot fluid.Radial disbalance heat pipe
16 heating sections strengthen the heat transfer of fume side using fin 19, keep 4 heat transfer efficiency of low-level (stack-gas) economizer high, device structure is compact, flue gas
Flow resistance is small.Equally, the structural parameters that fin 19 on radial disbalance heat pipe 16 is adjusted according to flue gas characteristic can make radial inclined
16 transimission power of heart heat pipe is adjustable, and tube wall temperature is adjustable, to be effectively prevented the dew point corrosion of 16 tube wall of radial disbalance heat pipe.
As shown in Figure 1, fume side installs soot blower 10 additional, and by adjusting the arrangement of radial disbalance heat pipe 16, guarantees stream to prevent dust stratification
Body reaches the flow velocity from deashing between pipe.In order to improve anti-corrosion effect, the casing 17 of the contact flue gas of radial disbalance heat pipe 16 and
Fin 19 uses ND steel anti-corrosion material.
Due to be provided with low-level (stack-gas) economizer 4, from condensation water inlet 21 from flow into low-level (stack-gas) economizer 4 50 DEG C of condensed water to
When at up to condensation water out 22, it can achieve 120 DEG C, the exhaust gas temperature of exhanst gas outlet 6 is down to 115 DEG C hereinafter, boiler thermal efficiency
It increases substantially.
The utility model enhances adjusting flue-gas temperature by using the combination unit of gas preheater and low-level (stack-gas) economizer
Flexibility.Flue-gas temperature is in addition to that can pass through the structural parameters of the heat exchange element in adjusting gas preheater, low-level (stack-gas) economizer
It adjusts, can also be adjusted by adjusting coal gas bypass regulator valve 8 and condensing water flow regulating valve 5.It is specific as follows:
When there is the problems such as ash is stifled, burn into a small amount of heat pipe failure in the gravity assisted heat pipe 11 of gas preheater 2, gas preheating
The performance of device 2 will be declined, and the flue gas exit temperature of gas preheater 2 increases (temperature increases i.e. at flue gas linkage section 3), this
When the water of (increases) condensed water is adjusted by condensing water flow regulating valve 5, can equally reduce exhaust gas temperature, guarantee that boiler is imitated
Rate.
Work as boiler at low load, when tail flue gas temperature is lower, adjusts coal gas bypass stream except through coal gas bypass regulator valve 8
Amount (gas flow for passing through gas pipe 23) outside, can also adjust low-level (stack-gas) economizer condensation by condensing water flow regulating valve 5
The flow of water, avoids equipment from generating dew point corrosion, and regulating measure flexibility and reliability guarantees equipment safety operation.
For example, gas boiler air preheater flue gas exit temperature is about 220 DEG C or so, by coal gas in the utility model
After the combination unit of preheater and low-level (stack-gas) economizer, first by gas inlet 1 enter gas preheater 2, by flue-gas temperature into
The cooling of row level-one.Meanwhile blast furnace gas by 40~60 DEG C of gas inlet 7 be heated to after exchanging heat gas exit 9 150~
180℃.Then, flue gas enters low-level (stack-gas) economizer 4 through flue gas linkage section 3, by flue-gas temperature after the heat exchange of gas preheater 2
Second level cooling is carried out, the exhaust gas temperature at exhanst gas outlet 6 is down to 115 DEG C or less.In addition, being coagulated due to being provided with low-level (stack-gas) economizer 4
120 DEG C can be heated to from 50 DEG C by bearing water.Therefore, fume afterheat is fully used, and boiler thermal efficiency increases substantially.
Although the utility model has been described by way of example and in terms of the preferred embodiments, embodiment is not for limiting the utility model
's.In the spirit and scope for not departing from the utility model, it is practical new to also belong to this for any equivalent change or retouch done
The protection scope of type.Therefore the protection scope of the utility model should be mark with the content that claims hereof is defined
It is quasi-.
Claims (11)
1. a kind of blast furnace gas boiler fume afterheat deep exploitation device, including gas passage and exhaust gases passes, the coal gas is logical
Gas preheater is provided in road and exhaust gases passes, which is characterized in that low-level (stack-gas) economizer is provided in the exhaust gases passes, it is described
Flue gas enters low-level (stack-gas) economizer after gas preheater.
2. blast furnace gas boiler fume afterheat deep exploitation device according to claim 1, which is characterized in that the low temperature
Economizer includes an at least radial disbalance heat pipe, and cold flow liquid enters from one end of radial disbalance heat pipe, from radial disbalance heat
The other end of pipe flows out.
3. blast furnace gas boiler fume afterheat deep exploitation device according to claim 2, which is characterized in that the radial direction
Eccentric heat pipe includes inner tube, casing, is vacuum environment between casing and inner tube, and filled with working medium, cold flow liquid is flowed in inner tube.
4. blast furnace gas boiler fume afterheat deep exploitation device according to claim 3, which is characterized in that described sleeve pipe
It is placed in exhaust gases passes, flue gas laterally skims over described sleeve pipe.
5. blast furnace gas boiler fume afterheat deep exploitation device according to claim 3, which is characterized in that described sleeve pipe
Equipped with fin.
6. blast furnace gas boiler fume afterheat deep exploitation device according to claim 1, which is characterized in that the low temperature
The regulating valve for adjusting cold flow fluid flow is provided on economizer.
7. blast furnace gas boiler fume afterheat deep exploitation device according to claim 1, which is characterized in that the coal gas
Preheater includes an at least high efficient heat exchanging element.
8. blast furnace gas boiler fume afterheat deep exploitation device according to claim 7, which is characterized in that described efficient
Heat exchange element is gravity assisted heat pipe, and the gravity assisted heat pipe includes heat pipe base tube, and the heat pipe base tube is equipped with fin.
9. blast furnace gas boiler fume afterheat deep exploitation device according to claim 8, which is characterized in that the coal gas
Preheater includes partition, and the gravity assisted heat pipe is divided into coal gas side and fume side by the partition.
10. blast furnace gas boiler fume afterheat deep exploitation device according to claim 1, which is characterized in that the coal
Air preheater is provided with coal gas bypass regulator valve.
11. blast furnace gas boiler fume afterheat deep exploitation device according to claim 1, which is characterized in that the height
Producer gas residual heat from boiler fume deep exploitation device is provided with soot blower.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821410953.5U CN208779478U (en) | 2018-08-29 | 2018-08-29 | A kind of blast furnace gas boiler fume afterheat deep exploitation device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821410953.5U CN208779478U (en) | 2018-08-29 | 2018-08-29 | A kind of blast furnace gas boiler fume afterheat deep exploitation device |
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| CN208779478U true CN208779478U (en) | 2019-04-23 |
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ID=66159304
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| CN201821410953.5U Active CN208779478U (en) | 2018-08-29 | 2018-08-29 | A kind of blast furnace gas boiler fume afterheat deep exploitation device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111197928A (en) * | 2020-02-26 | 2020-05-26 | 宝莲华七彩新能源(江苏)有限公司 | Grain drying system based on multi-fluid heat pipe |
| CN116447597A (en) * | 2023-04-27 | 2023-07-18 | 张家港宏昌钢板有限公司 | Split type boiler gas heater |
-
2018
- 2018-08-29 CN CN201821410953.5U patent/CN208779478U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111197928A (en) * | 2020-02-26 | 2020-05-26 | 宝莲华七彩新能源(江苏)有限公司 | Grain drying system based on multi-fluid heat pipe |
| CN116447597A (en) * | 2023-04-27 | 2023-07-18 | 张家港宏昌钢板有限公司 | Split type boiler gas heater |
| CN116447597B (en) * | 2023-04-27 | 2023-11-03 | 张家港宏昌钢板有限公司 | Split type boiler gas heater |
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