CN211902832U - Condensed water heating system utilizing waste heat of waste heat boiler flue - Google Patents
Condensed water heating system utilizing waste heat of waste heat boiler flue Download PDFInfo
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- CN211902832U CN211902832U CN201922429001.9U CN201922429001U CN211902832U CN 211902832 U CN211902832 U CN 211902832U CN 201922429001 U CN201922429001 U CN 201922429001U CN 211902832 U CN211902832 U CN 211902832U
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Abstract
The utility model discloses an utilize condensate heating system of exhaust-heat boiler flue waste heat, including exhaust-heat boiler flue, condensate heater and water heat exchanger, the condensate heater is located on the exhaust-heat boiler flue, the input of condensate heater is connected with the condensate water inlet line, and the output of condensate heater is connected with the condensate water outlet line, water heat exchanger locates the condensate water inlet line with between the condensate water outlet line. The utility model has the advantages of the high just ability effective control low temperature corrosion of afterbody flue gas waste heat utilization ratio.
Description
Technical Field
The utility model relates to a glass kiln exhaust-heat boiler technical field, concretely relates to utilize condensate heating system of exhaust-heat boiler flue waste heat.
Background
The production line of the glass kiln needs to consume a large amount of energy, a lot of heat can not be utilized due to the problem of utilization rate in the production process, and the waste heat boiler can recycle the heat of the tail gas generated by the glass kiln, so that the glass kiln has high economic benefit and social benefit.
Because of the different fuel components of each glass kiln, SO in the flue gas2The concentration is different, and the SO is currently regulated according to the emission standard of atmospheric pollutants in the glass industry2The concentration discharge index is less than or equal to 400mg/Nm3(ii) a The exhaust gas temperature of the waste heat boiler of the glass kiln is determined according to the acid dew point temperature of the exhaust gas (by SO in the exhaust gas)2Concentration calculation) is generally set at 170-. In recent years, the requirement for environmental protection is higher and higher, most glass kiln production lines are technically improved by adjusting the variety of fuels, upgrading the desulfurization process and other methods, and the emission indexes of the tail gas of the newly-built and technically-improved glass kilns at present can achieve SO2The discharge concentration is less than or equal to 200mg/Nm3And the acid dew point temperature can be reduced to be less than or equal to 120 ℃; this means that the tail part of the waste heat boiler designed originally has the waste heat with the temperature difference of 30-60 ℃ available.
In addition, the design of the waste heat boiler of the partially newly built glass kiln adopts the expansion of the heating surface of the boiler, and the exhaust gas temperature of the waste heat boiler is directly reduced (less than or equal to 120 ℃). However, in practical application, the waste heat boiler receives flue gas generated by the glass kiln, and working conditions such as flue gas quantity, flue gas temperature and the like change along with requirements of a glass kiln production line, so that the design working conditions of the boiler cannot be completely met, the actual flue gas temperature cannot reach the designed flue gas temperature, the low-temperature corrosion condition of the tail heating surface is caused, and the operation safety of the boiler is seriously influenced.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is to overcome the not enough of prior art existence, provide a condensation water heating system of utilization exhaust-heat boiler flue waste heat that can effective control low temperature corrosion afterbody flue gas waste heat utilization rate is high simultaneously.
In order to solve the technical problem, the utility model provides a technical scheme does:
the utility model provides an utilize condensate heating system of exhaust-heat boiler flue waste heat, includes exhaust-heat boiler flue, condensate heater and water heat exchanger, the condensate heater is located on the exhaust-heat boiler flue, the input of condensate heater is connected with the condensate water inlet line, and the output of condensate heater is connected with the condensate water outlet line, water heat exchanger locates the condensate water inlet line with between the condensate water outlet line.
Optionally, the exhaust-heat boiler flue includes a tail main flue and a bypass flue, the condensed water heater is arranged on the tail main flue, the tail main flues at two ends of the condensed water heater are respectively provided with a first valve and a second valve, and the bypass flue is provided with a third valve.
Optionally, the condensate water inlet pipeline includes the heat exchange tube of intaking and the bypass pipe of intaking, the heat exchange tube of intaking passes water heat exchanger with the condensate water heater links to each other, the bypass pipe of intaking is direct to link to each other with the condensate water heater.
Optionally, the condensed water outlet pipeline comprises a water outlet heat exchange pipe and a water outlet bypass pipe, the water outlet heat exchange pipe is connected with the condensed water heater through the water-water heat exchanger, and the water outlet bypass pipe is directly connected with the condensed water heater.
Optionally, the water inlet heat exchange tubes at the two ends of the water-water heat exchanger are both provided with regulating valves, and the water inlet bypass tubes are also provided with regulating valves.
Optionally, the water outlet heat exchange tubes at the two ends of the water-water heat exchanger are both provided with regulating valves, and the water outlet bypass tube is also provided with a regulating valve.
Optionally, the output end of the condensed water outlet pipeline is connected with a deaerator for reducing the dissolved oxygen in water.
Optionally, the condensed water heater is an external condensed water heater arranged on the outer wall of the tail part of the flue of the waste heat boiler.
Optionally, the condensed water heater comprises a plurality of heater units, and the plurality of heater units are sequentially arranged in series.
Compared with the prior art, the utility model has the advantages of:
the utility model discloses a set up the condensate water heater at exhaust-heat boiler flue afterbody and heat the condensate water, the utilization ratio of exhaust-heat boiler afterbody flue gas waste heat has been improved, and then the holistic efficiency of exhaust-heat boiler has been increased, water heat exchanger has still been set up in addition, water in making the condensate water outlet pipe line through water heat exchanger gives the water heating in the condensate water inlet pipe line, with the temperature in adjusting the condensate water inlet pipe line, thereby adjust the exhaust-heat boiler flue's exhaust-gas temperature, reduce the difference in temperature of temperature in exhaust-gas temperature and the condensate water inlet pipe line, reach the acid dew point of flue gas when crossing excessively with avoiding exhaust-gas temperature, make acid drip attach and cause the corruption on the heat transfer surface. The utility model discloses a condensate heating system make full use of the flue gas waste heat of afterbody, improved waste heat utilization rate, effectively reduced exhaust-heat boiler flue afterbody heat-transfer surface low temperature corrosion's risk simultaneously.
Drawings
Fig. 1 is a schematic configuration diagram of a condensed water heating system in the embodiment.
Fig. 2 is a schematic structural diagram of the waste heat boiler system in the embodiment.
Fig. 3 is a schematic view of the waste heat boiler system in an embodiment from above (water-water heat exchanger is not shown).
Fig. 4 is an apparatus diagram of the heat recovery steam generator and the heat recovery steam generator flue in the embodiment (the water-water heat exchanger is not shown).
Illustration of the drawings:
1. a flue of the waste heat boiler; 11. a tail main flue; 111. a first valve; 112. a second valve; 12. a bypass flue; 121. a third valve; 2. a condensed water heater; 3. a water-water heat exchanger; 4. a condensed water inlet line; 41. a water inlet heat exchange pipe; 42. a water inlet bypass pipe; 5. a condensed water outlet line; 51. a water outlet heat exchange pipe; 52. a water outlet bypass pipe; 6. a deaerator; 7. a waste heat boiler body; 71. an oxygen removal evaporator.
Detailed Description
In order to facilitate understanding of the present invention, the present invention will be described more fully and specifically with reference to the accompanying drawings and preferred embodiments, but the scope of the present invention is not limited to the following specific embodiments.
In an embodiment of the present invention, as shown in fig. 1, fig. 2 and fig. 4, a condensed water heating system using waste heat of a waste heat boiler flue is provided, which includes a waste heat boiler flue 1, a condensed water heater 2, a water-water heat exchanger 3 and a deaerator 6, wherein the waste heat boiler flue 1 is communicated with a waste heat boiler body 7, flue gas generated by the waste heat boiler body 7 is discharged from the waste heat boiler body 7 and enters the waste heat boiler flue 1 (considering that the arrangement of the pipes is complicated, the flow direction of the flue gas is indicated by dotted lines in the figure), the condensed water heater 2 is arranged on the waste heat boiler flue 1, the input end of the condensed water heater 2 is connected with a condensed water inlet pipe 4, the output end of the condensed water heater 2 is connected with a condensed water outlet pipe 5, the water heat exchanger 3 is arranged between the condensed water inlet pipe 4 and the condensed water outlet pipe 5, the water heat exchanger 3 is used for heat exchange between the two material pipes, namely the condensed, in particular, the water in the condensed water inlet line 4 is heated by the water in the condensed water outlet line 5 to prevent low temperature corrosion caused by the low temperature of the inlet water in the condensed water inlet line 4. The output of condensate outlet pipe line 5 links to each other with oxygen-eliminating device 6, and is concrete, and the water after the heating of condensate heater 2 lets in deoxidization in oxygen-eliminating device 6 to reduce the dissolved oxygen volume in the aquatic, reduce the dissolved oxygen corruption of metal parts.
In an embodiment of the present invention, as shown in fig. 3, the waste heat boiler flue 1 includes a tail flue 11 and a bypass flue 12, the condensed water heater 2 is disposed on the tail flue 11, the tail flue 11 at both ends of the condensed water heater 2 is respectively provided with a first valve 111 and a second valve 112, and the bypass flue 12 is provided with a third valve 121.
Specifically, an inlet butterfly valve is provided at an inlet of the tail flue 11 as the first valve 111, an outlet butterfly valve is provided at an outlet of the tail flue 11 as the second valve 112, and a bypass flue butterfly valve is provided on the bypass flue 12 as the third valve 121. When the first valve 111 and the second valve 112 at the inlet and the outlet are closed and the third valve 121 on the bypass flue 12 is opened, the flue gas passes through the bypass flue 12, and the condensed water heater 2 is in a bypass maintenance working condition; when the third valve 121 on the bypass flue 12 is closed and the first valve 111 and the second valve 112 at the inlet and the outlet are opened, the flue gas passes through the tail main flue 11 and the condensate heater 2 is in a heating condition. Through setting up afterbody flue 11 and bypass flue 12, even afterbody flue 11 heat-transfer surface has produced low temperature corrosion, also can carry out online maintenance through closing afterbody flue 11 and intercommunication bypass flue 12, need not to shut down the stove, improve whole exhaust-heat boiler system's annual time of putting into operation and life.
The utility model discloses an in the embodiment, condensate water inlet line 4 is including intaking heat exchange tube 41 and the bypass pipe 42 of intaking, and the heat exchange tube 41 of intaking links to each other with condensate water heater 2 through water heat exchanger 3, and the bypass pipe 42 of intaking directly links to each other with condensate water heater 2, all is equipped with the governing valve on the heat exchange tube 41 of intaking at 3 both ends of water heat exchanger, also is equipped with the governing valve on the bypass pipe 42 of intaking. During operation can adjust the governing valve on the heat exchange tube 41 of intaking and the bypass pipe 42 of intaking and adjust the condensate water intake pipe 4 on total intake water volume and the temperature of intaking to guarantee the temperature of 2 afterbody heat transfer surface imports of condensate water heater, reduce 2 outlet end differences (the difference in temperature of exhaust gas temperature and the temperature of intaking), with outlet end difference control in safety range, thereby adjust the exhaust gas temperature of whole exhaust-heat boiler system, guarantee that exhaust gas temperature is above the acid dew point temperature of operating condition, greatly reduced the low temperature corrosion risk.
The utility model discloses an in the embodiment, the condensate outlet pipe line 5 includes out water heat exchange tube 51 and goes out water bypass pipe 52, goes out water heat exchange tube 51 and links to each other with condensate heater 2 through water heat exchanger 3, goes out water bypass pipe 52 and directly links to each other with condensate heater 2, all is equipped with the governing valve on the play water heat exchange tube 51 at water heat exchanger 3 both ends, also is equipped with the governing valve on going out water bypass pipe 52. When the heat exchanger works, the regulating valves on the water outlet heat exchange pipe 51 and the water outlet bypass pipe 52 can be regulated to regulate and control the heat exchange quantity of the water-water heat exchanger 3, so that the heat exchange with the condensed water inlet pipeline 4 is realized, and the water inlet temperature of the condensed water inlet pipeline 4 is regulated.
The utility model discloses an in the embodiment, water heat exchanger 3 is surface formula water heat exchanger, and is concrete, and it adopts plate heat transfer structure.
The utility model discloses an in the embodiment, the external condensate water heater of condensate water heater 2 for setting up on 1 afterbody outer wall of exhaust-heat boiler flue, external condensate water heat exchanger is independent of exhaust-heat boiler flue 1, is convenient for reform transform the installation to it, maintains and overhauls, and does not influence the normal work of exhaust-heat boiler body 7. Specifically, the condensate water heater 2 comprises two heater units which are connected in series, the modularized heater units are convenient to produce and manufacture, a proper amount of heater units can be installed according to actual production needs, and the heater units are connected in series to form the condensate water heater 2 as a whole.
The utility model discloses an in the embodiment, the during operation of condensate heating system, condensate heater 2 with the water heating to being close saturation temperature, send to oxygen-eliminating device 6 through condensate outlet pipe line 5, oxygen-eliminating device 6 utilizes the principle that the aquatic dissolved oxygen volume is minimum under the saturated condition to carry out the deoxidization, and 6 lower parts of oxygen-eliminating device are saturated steam, adopt the countercurrent method to make the water in the oxygen-eliminating device 6 form saturated water and carry out the deoxidization.
The utility model discloses an in the embodiment, oxygen-eliminating device 6 is a low pressure steam pocket, and the low pressure steam pocket is that steam-water mixture carries out the place of separating, and the saturated steam part of isolating is used for the condensate heating, and the part can directly be used for glass kiln production line industry steam source, and the low pressure steam pocket still provides the water source for the high pressure steam pocket as the water tank except carrying out the effect of low pressure saturated steam separation.
In an embodiment of the present invention, a plurality of deaerating evaporators 71 are disposed in the exhaust-heat boiler body 7. The waste heat boiler body 7 is used for fully utilizing the heat energy of the tail gas of the glass kiln, reducing the exhaust gas temperature and recovering the waste heat of the flue gas for cogeneration, and generally adopts a single-pressure or double-pressure boiler.
The utility model discloses an in the embodiment, be equipped with saturated steam pipe 61 and saturated water pipe 62 on the low pressure steam pocket, saturated steam pipe 61 is used for discharging the saturated steam of separation and supplies follow-up workshop section to use, and saturated water pipe 62 links to each other with except that oxygen evaporator 71, and saturated water gets into except that oxygen evaporator 71 through saturated water pipe 62 and continues the heat absorption, forms the steam-water mixture, utilizes the density difference to get back to the low pressure steam pocket again, forms natural circulation. In the prior art, the feed water of the deaerator 6 is directly unheated condensed water, and comes from a hot well of a condenser under a steam turbine (the temperature is different due to different vacuum of the condenser and is generally 38-45 ℃), and the feed water needs to absorb a large amount of heat after entering a low-pressure steam drum so as to achieve the effect of thermal deaeration.
When the waste heat boiler body 7 runs, due to the adjustment of the production capacity of the glass kiln, the change of the heat value of fuel, the temperature of combustion air, the sulfur content of fuel and other reasons can cause the change of the amount of flue gas entering the waste heat boiler, the temperature and the humidity of the flue gas, and the acid dew point temperature of the flue gas also changes. Because the fuel of the glass kiln can generate a certain amount of sulfur dioxide and water vapor after being combusted, although the fuel is treated by desulfurization, denitrification and dedusting, a certain amount of residual sulfur dioxide still exists, if the temperature of the inlet of the condensed water heater 2 is too low and reaches the acid dew point of the flue gas, acid drops are formed and attached to the tail end heat exchange surface to cause corrosion. In order to avoid corrosion of a heat exchange surface, the water-water heat exchanger 3 exchanges heat between cold water of the condensed water inlet pipeline 4 and hot water of the condensed water outlet pipeline 5, the water inlet temperature of the condensed water inlet pipeline 4 is increased, so that the water temperature at the inlet of the condensed water heater 2 is controlled to be about 80-100 ℃, the temperature difference between the exhaust gas temperature and the water inlet temperature is reduced, and the risk of low-temperature acid drop corrosion is reduced. Since the condensed water inlet pipeline 4 and the condensed water outlet pipeline 5 are both provided with a bypass in the embodiment, the heat exchange amount of the water-water heat exchanger 3 can be adjusted by adjusting the adjusting valves on the water inlet heat exchange pipe 41, the water inlet bypass pipe 42, the water outlet heat exchange pipe 51 and the water outlet bypass pipe 52, the water inlet temperature of the condensed water heater 2 is controlled, and the smoke temperature of the smoke is further controlled. Generally, the acid dew point temperature of the desulfurized glass kiln flue gas is about 120 ℃, and the flue gas temperature can be controlled to be 110-138 ℃ by adjusting the water quantity and the water inlet temperature of the condensed water inlet pipeline 4, so that the low-temperature corrosion phenomenon can not occur under various working conditions.
When the working condition of the glass kiln changes, the flue gas temperature is too low and is not suitable for reuse, or a small amount of corrosion is caused due to overlong operation time and needs to be maintained, the first valve 111 and the second valve 112 can be closed, the third valve 121 is opened, online maintenance is carried out in a bypass mode of the bypass flue 12, the furnace does not need to be stopped, and the annual operation time and the service life of the whole boiler system are prolonged.
When the flue gas temperature is suitable for reuse, the first valve 111 and the second valve 112 are opened, the third valve 121 is closed, the condensed water heater 2 is enabled to be in a normal heating working condition, the condensed water from the condensed water inlet pipeline 4 enters the condensed water heater 2 for heating, and enters the deaerator 6 for deaerating through the condensed water outlet pipeline 5, so that the deaerating efficiency of the thermal deaerator 6 is improved, and the flue gas waste heat is fully utilized.
Although the present invention has been described with reference to the preferred embodiments, it is not intended to limit the present invention. The technical solution of the present invention can be used by anyone skilled in the art to make many possible variations and modifications, or to modify equivalent embodiments, without departing from the scope of the technical solution of the present invention, using the technical content disclosed above. Therefore, any simple modification, equivalent change and modification made to the above embodiments by the technical entity of the present invention should fall within the protection scope of the technical solution of the present invention.
Claims (9)
1. The utility model provides an utilize condensate heating system of exhaust-heat boiler flue waste heat which characterized in that: including exhaust-heat boiler flue (1), condensate heater (2) and water heat exchanger (3), condensate heater (2) are located on exhaust-heat boiler flue (1), the input of condensate heater (2) is connected with condensate water inlet pipe line (4), and the output of condensate heater (2) is connected with condensate water outlet pipe line (5), water heat exchanger (3) are located condensate water inlet pipe line (4) with between condensate water outlet pipe line (5).
2. The condensed water heating system using waste heat of a flue of a waste heat boiler according to claim 1, characterized in that: waste heat boiler flue (1) includes afterbody flue stack (11) and bypass flue (12), condensate water heater (2) are located on afterbody flue stack (11), and be equipped with first valve (111) and second valve (112) on afterbody flue stack (11) at condensate water heater (2) both ends respectively, be equipped with third valve (121) on bypass flue (12).
3. The condensed water heating system using waste heat of a flue of a waste heat boiler according to claim 1, characterized in that: the condensed water inlet pipeline (4) comprises a water inlet heat exchange pipe (41) and a water inlet bypass pipe (42), the water inlet heat exchange pipe (41) is passed through the water heat exchanger (3) and the condensed water heater (2) are connected, and the water inlet bypass pipe (42) is directly connected with the condensed water heater (2).
4. The condensed water heating system using waste heat of a flue of a waste heat boiler according to claim 2, characterized in that: the condensed water outlet pipeline (5) comprises a water outlet heat exchange pipe (51) and a water outlet bypass pipe (52), the water outlet heat exchange pipe (51) is connected with the condensed water heater (2) through the water-water heat exchanger (3), and the water outlet bypass pipe (52) is directly connected with the condensed water heater (2).
5. The condensed water heating system using waste heat of a flue of a waste heat boiler according to claim 3, characterized in that: the water inlet heat exchange pipes (41) at the two ends of the water-water heat exchanger (3) are respectively provided with an adjusting valve, and the water inlet bypass pipe (42) is also provided with an adjusting valve.
6. The condensed water heating system using waste heat of a flue of a waste heat boiler according to claim 4, characterized in that: the water outlet heat exchange pipes (51) at the two ends of the water-water heat exchanger (3) are respectively provided with an adjusting valve, and the water outlet bypass pipe (52) is also provided with an adjusting valve.
7. The condensed water heating system using waste heat of a flue of a waste heat boiler according to any one of claims 1 to 6, wherein: the output end of the condensed water outlet pipeline (5) is connected with a deaerator (6) used for reducing the dissolved oxygen in water.
8. The condensed water heating system using waste heat of a flue of a waste heat boiler according to any one of claims 1 to 6, wherein: the condensed water heater (2) is an external condensed water heater arranged on the outer wall of the tail part of the waste heat boiler flue (1).
9. The condensed water heating system using waste heat of a flue of a waste heat boiler according to claim 8, characterized in that: the condensed water heater (2) comprises a plurality of heater units which are sequentially arranged in series.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922429001.9U CN211902832U (en) | 2019-12-28 | 2019-12-28 | Condensed water heating system utilizing waste heat of waste heat boiler flue |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922429001.9U CN211902832U (en) | 2019-12-28 | 2019-12-28 | Condensed water heating system utilizing waste heat of waste heat boiler flue |
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| Publication Number | Publication Date |
|---|---|
| CN211902832U true CN211902832U (en) | 2020-11-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922429001.9U Active CN211902832U (en) | 2019-12-28 | 2019-12-28 | Condensed water heating system utilizing waste heat of waste heat boiler flue |
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| CN (1) | CN211902832U (en) |
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2019
- 2019-12-28 CN CN201922429001.9U patent/CN211902832U/en active Active
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Address after: 423400 No. 9 Jianggao Road, Ziwu Industrial Park, Tangdong Street, Zixing City, Chenzhou City, Hunan Province Patentee after: Hunan Qibin Solar Technology Co.,Ltd. Address before: 423400 No. 9 Jianggao Road, Ziwu Industrial Park, Tangdong Street, Zixing City, Chenzhou City, Hunan Province Patentee before: CHENZHOU QIBIN PHOTOVOLTAIC AND PHOTOELECTRIC GLASS Co.,Ltd. |