CN219977124U - Molten salt furnace waste heat recycling system - Google Patents
Molten salt furnace waste heat recycling system Download PDFInfo
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- CN219977124U CN219977124U CN202321206621.6U CN202321206621U CN219977124U CN 219977124 U CN219977124 U CN 219977124U CN 202321206621 U CN202321206621 U CN 202321206621U CN 219977124 U CN219977124 U CN 219977124U
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- smoke
- flue gas
- pipeline
- outlet
- molten salt
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- 150000003839 salts Chemical class 0.000 title claims abstract description 41
- 239000002918 waste heat Substances 0.000 title claims abstract description 29
- 238000004064 recycling Methods 0.000 title claims abstract description 18
- 239000000779 smoke Substances 0.000 claims abstract description 73
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 61
- 239000003546 flue gas Substances 0.000 claims abstract description 61
- 239000010865 sewage Substances 0.000 claims abstract description 36
- 238000011084 recovery Methods 0.000 claims abstract description 25
- 238000005273 aeration Methods 0.000 claims abstract description 16
- 230000001105 regulatory effect Effects 0.000 claims description 9
- 230000009471 action Effects 0.000 abstract description 6
- 238000000034 method Methods 0.000 abstract description 4
- 230000008569 process Effects 0.000 abstract description 4
- 230000008901 benefit Effects 0.000 abstract description 3
- 238000007667 floating Methods 0.000 abstract description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 239000003513 alkali Substances 0.000 description 4
- 239000000446 fuel Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 230000002829 reductive effect Effects 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 230000002411 adverse Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000001223 reverse osmosis Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 230000036961 partial effect Effects 0.000 description 1
- 238000006722 reduction reaction Methods 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
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- Chimneys And Flues (AREA)
Abstract
The utility model discloses a molten salt furnace waste heat recycling system, which comprises an air heat exchanger; a smoke outlet and a smoke return port are arranged on a chimney of the molten salt furnace, the smoke outlet is communicated with a smoke inlet at the top of the air heat exchanger through a smoke inlet pipe, a smoke outlet at the bottom of the air heat exchanger is communicated with an inlet of a flue gas fan, and an outlet of the flue gas fan is communicated with the smoke return port through a smoke exhaust pipeline; the exhaust port of the flue gas recovery pipe is communicated with the aeration main pipe of the sewage tank. The advantages are that: under the action of a flue gas fan, high-temperature flue gas after heat exchange in the air heat exchanger sequentially enters the aeration main pipe along the smoke exhaust pipeline and the flue gas recovery pipe, and then is blown into the bottom of the sewage tank through the aeration distribution pipe, and the flue gas fully contacts with sewage in the floating process and carries out heat exchange and temperature rise on the sewage, so that the waste heat in the flue gas is fully recycled, and meanwhile, after the waste heat is utilized to heat the sewage, the normal and effective operation of the sewage treatment device is effectively ensured.
Description
Technical field:
the utility model relates to the technical field of chlor-alkali production equipment, in particular to a molten salt furnace waste heat recycling system.
The background technology is as follows:
with the continuous promotion of water conservation, emission reduction, energy conservation and consumption reduction in recent years, the sewage discharge amount in chlor-alkali production steadily decreases, high-temperature wastewater (especially steam condensate water) realizes comprehensive recycling, the temperature of the sewage discharged in winter is lower (about 18-20 ℃), adverse effects are generated on the normal and efficient operation of a reverse osmosis membrane group for downstream sewage treatment (the optimal operation temperature of the reverse osmosis membrane group is about 25 ℃), the operation quality of a downstream sewage treatment device is ensured in winter, and the temperature index requirement of sewage treatment on the water discharge is met.
Part of waste heat exists in the production process of the chlor-alkali production device, especially the flue gas waste heat of the molten salt furnace is not effectively utilized; the temperature of the molten salt furnace is raised by using natural gas as a main fuel and hydrogen as an auxiliary fuel, and high-temperature flue gas generated by fuel combustion is mainly used for preheating cold air except for recovering part of heat energy through an economizer, and the flue gas discharged from the molten salt furnace is cooled by the cold air and then discharged to the atmosphere at the temperature of about 185 ℃ according to the actual operation of the prior device, so that part of flue gas waste heat is not effectively utilized and is directly discharged, and the energy waste is caused.
In order to realize simple and effective recycling of waste heat, further improve energy utilization efficiency and reduce energy consumption, a scheme for heating sewage in winter by using the waste heat of flue gas of the chlor-alkali molten salt furnace is particularly provided.
The utility model comprises the following steps:
the utility model aims to provide a molten salt furnace waste heat recycling system which effectively utilizes waste heat so as to avoid energy waste and ensure the normal operation of a downstream water treatment device.
The utility model is implemented by the following technical scheme: the molten salt furnace waste heat recycling system comprises a molten salt furnace, an air heat exchanger, a flue gas fan and a sewage tank; a smoke outlet and a smoke return port are formed in a chimney of the molten salt furnace, and a gate valve is arranged on the chimney between the smoke outlet and the smoke return port; the smoke outlet is communicated with a smoke inlet at the top of the air heat exchanger through a smoke inlet pipe, a smoke outlet at the bottom of the air heat exchanger is communicated with an inlet of the flue gas fan, and an outlet of the flue gas fan is communicated with the smoke return port through a smoke exhaust pipeline; a pneumatic cut-off valve is arranged on the smoke exhaust pipeline, a smoke recovery pipe is communicated between the pneumatic cut-off valve and the flue gas fan, and an exhaust port of the smoke recovery pipe is communicated with an aeration main pipe of the sewage tank; the flue gas recovery pipe is provided with a booster fan, and the flue gas recovery pipe at the air inlet of the booster fan is provided with a first pneumatic regulating valve.
Further, the upper cover of the sewage pool is provided with a pool cover, and an air outlet on the pool cover is communicated with the exhaust fan through a pipeline.
Further, it also includes a pressure relief line; one end of the pressure relief pipeline is connected to the smoke recovery pipe at the outlet of the booster fan, and the other end of the pressure relief pipeline is connected to the smoke exhaust pipeline at the outlet of the pneumatic cut-off valve; and a second pneumatic regulating valve is arranged on the pressure relief pipeline.
Further, a pressure transmitter is installed on the flue gas recovery pipe at the outlet of the booster fan, the pressure transmitter is electrically connected with a signal input end of a controller, and a signal output end of the controller is electrically connected with the second pneumatic regulating valve.
Further, the lower air inlet of the air heat exchanger is communicated with a cold air inlet pipeline, an induced draft fan is arranged on the cold air inlet pipeline, the upper air outlet of the air heat exchanger is communicated with a hot air outlet pipeline, and the exhaust port of the hot air outlet pipeline is communicated to the inside of the combustor of the molten salt furnace.
Further, expansion joints are arranged on the flue gas inlet pipe, the smoke exhaust pipeline and the hot air outlet pipe.
Further, a bypass pipeline is communicated between the cold air inlet pipeline and the hot air outlet pipeline, and a bypass valve is arranged on the bypass pipeline.
Further, a temperature transmitter is installed at the smoke outlet at the bottom of the air heat exchanger, the temperature transmitter is electrically connected with the signal input end of the controller, and the signal output end of the controller is electrically connected with the bypass valve.
The utility model disclosesThe shape has the advantages that: under the action of a flue gas fan, high-temperature flue gas subjected to heat exchange in the air heat exchanger sequentially enters an aeration main pipe along a smoke exhaust pipeline and a flue gas recovery pipe, and then is blown into the bottom of a sewage tank through an aeration distribution pipe, and the flue gas is fully contacted with sewage in the floating process and carries out heat exchange and temperature rise on the sewage, so that waste heat in the flue gas is fully recycled, and meanwhile, after the waste heat is utilized to heat the sewage, the normal and effective operation of a sewage treatment device is effectively ensured; the flue gas waste heat is recycled and utilized to heat the sewage in winter, so that the use of steam for heating the sewage in winter at present can be reduced or even replaced, and the average flue gas recycling amount is 20000m 3 And (3) calculating the average steam amount per hour to be about 2.47t, and accumulatively realizing steam saving of 1 ten thousand t during water discharge in winter, wherein the steam saving is about 1000t, the emission of carbon dioxide is reduced by about 3000t, and the direct steam saving benefit is about 220 ten thousand yuan according to 206 yuan per ton of steam.
Description of the drawings:
fig. 1 is a schematic structural view of the present utility model.
The components in the drawings are marked as follows: the molten salt furnace 1, a chimney 1.1, a smoke outlet 1.11, a smoke return 1.12, a burner 1.2, an air heat exchanger 2, a flue gas fan 3, a sewage tank 4, a gate valve 5, a smoke inlet pipe 6, a smoke exhaust pipe 7, a pneumatic cut-off valve 8, a smoke recycling pipe 9, an aeration main pipe 10, a booster fan 11, a first pneumatic control valve 12, a pool cover 13, an exhaust fan 14, a pressure relief pipeline 15, a second pneumatic control valve 16, a pressure transmitter 17, a controller 18, a cold air inlet pipeline 19, a draught fan 20, a hot air outlet pipeline 21, an expansion joint 22, a bypass pipeline 23, a bypass valve 24, a temperature transmitter 25 and an aeration distributing pipe 26.
The specific embodiment is as follows:
the following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
As shown in fig. 1, the present embodiment provides a molten salt furnace waste heat recovery and utilization system, which comprises a molten salt furnace 1, an air heat exchanger 2, a flue gas fan 3 and a sewage tank 4; a smoke outlet 1.11 and a smoke return opening 1.12 are arranged on a chimney 1.1 of the molten salt furnace 1, a gate valve 5 is arranged on the chimney 1.1 between the smoke outlet 1.11 and the smoke return opening 1.12, when the molten salt furnace 1 operates normally, the gate valve 5 is closed to isolate the smoke outlet 1.11 from the smoke return opening 1.12, so that smoke is ensured to enter the air heat exchanger 2 from the smoke outlet 1.11 firstly, waste heat is recovered, and direct discharge is avoided; the smoke outlet 1.11 is communicated with a smoke inlet at the top of the air heat exchanger 2 through a smoke inlet pipe 6, a smoke outlet at the bottom of the air heat exchanger 2 is communicated with an inlet of the flue gas fan 3, and an outlet of the flue gas fan 3 is communicated with the smoke return port 1.12 through a smoke exhaust pipeline 7; under the action of a flue gas fan 3, flue gas exhausted by the molten salt furnace 1 along a chimney 1.1 enters the air heat exchanger 2 from a flue gas inlet pipe 6 through a flue gas outlet 1.11 under the shielding of a gate valve 5 to exchange heat with air.
The lower air inlet of the air heat exchanger 2 is communicated with a cold air inlet pipeline 19, a draught fan 20 is arranged on the cold air inlet pipeline 19, the upper air outlet of the air heat exchanger 2 is communicated with a hot air outlet pipeline 21, and the exhaust port of the hot air outlet pipeline 21 is communicated into the combustor 1.2 of the molten salt furnace 1; under the action of the induced draft fan 20, air enters the air heat exchanger 2 from the cold air inlet pipeline 19, exchanges heat with flue gas, and the air after heat exchange and temperature rise enters the burner 1.2 air supply system of the molten salt furnace 1 along the hot air outlet pipeline 21, so that hot air is supplied to the molten salt furnace, and the fuel consumption is reduced; expansion joints 22 are arranged on the flue gas inlet pipe 6, the flue gas discharging pipeline 7 and the hot air outlet pipeline 21 and are used for supplementing the thermal extension of the pipelines.
The smoke exhaust pipeline 7 is provided with a pneumatic cut-off valve 8, a smoke recovery pipe 9 is communicated between the pneumatic cut-off valve 8 and the flue gas fan 3, an exhaust port of the smoke recovery pipe 9 is communicated with an aeration main pipe 10 of the sewage tank 4, and the aeration main pipe 10 is communicated with a plurality of aeration distributing pipes 26 extending into the sewage tank 4; two booster fans 11 are arranged on the flue gas recovery pipe 9 in series, and a first pneumatic adjusting valve 12 is arranged on the flue gas recovery pipe 9 at the air inlet of the booster fans 11; when the molten salt furnace 1 normally operates, the pneumatic cut-off valve 8 is closed, the first pneumatic regulating valve 12 is opened, under the action of the flue gas fan 3, high-temperature flue gas subjected to heat exchange sequentially enters the aeration main pipe 10 along the smoke discharge pipeline 7 and the flue gas recovery pipe 9, and then is blown into the bottom of the sewage tank 4 through the aeration distributing pipe 26, and the flue gas fully contacts with sewage in the floating process and carries out heat exchange and temperature rise on the sewage, so that the waste heat in the flue gas is fully recycled, and meanwhile, after the waste heat is used for heating the sewage, the normal and effective operation of the sewage treatment device is effectively ensured; the upper cover of the sewage pool 4 is provided with a pool cover 13, an air outlet on the pool cover 13 is communicated with an exhaust fan 14 through a pipeline, and under the action of the exhaust fan 14, the flue gas is emptied after full heat exchange and temperature reduction.
It also includes a pressure relief line 15; one end of a pressure relief pipeline 15 is connected to a smoke recovery pipe 9 at the outlet of the booster fan 11, and the other end of the pressure relief pipeline 15 is connected to a smoke exhaust pipeline 7 at the outlet of the pneumatic cut-off valve 8; the pressure relief pipeline 15 is provided with a second pneumatic regulating valve 16; a pressure transmitter 17 is arranged on the flue gas recovery pipe 9 at the outlet of the booster fan 11, the pressure transmitter 17 is electrically connected with a signal input end of a controller 18, a signal output end of the controller 18 is electrically connected with a second pneumatic regulating valve 16, and the pressure in the flue gas recovery pipe 9 communicated with the aeration main pipe 10 is detected in real time through the pressure transmitter 17 and fed back to the control; when the water level in the sewage tank 4 rises, the pressure in the aeration main pipe 10 and the smoke recovery pipe 9 is increased, so that the whole system, especially the furnace temperature in the molten salt furnace 1, is influenced, at the moment, the pressure value detected by the pressure transmitter 17 exceeds the set upper limit value, the feedback controller 18 controls the second pneumatic regulating valve 16 to be opened through the controller 18, part of smoke enters the smoke return port 1.12 along the pressure relief pipeline 15 and the smoke exhaust pipeline 7, and is exhausted from the chimney 1.1, so that partial pressure relief is realized, and the normal operation of the molten salt furnace 1 is ensured.
A bypass pipeline 23 is communicated between the cold air inlet pipeline 19 and the hot air outlet pipeline 21, and a bypass valve 24 is arranged on the bypass pipeline 23; a temperature transmitter 25 is arranged at the smoke outlet at the bottom of the air heat exchanger 2, the temperature transmitter 25 is electrically connected with the signal input end of the controller 18, and the signal output end of the controller 18 is electrically connected with the bypass valve 24; the temperature of the flue gas after heat exchange is detected in real time through the temperature transmitter 25, when the temperature after heat exchange is lower, the corresponding air temperature after heat exchange is higher, in order to avoid adverse effects of high-temperature air on the normal operation of the molten salt furnace 1, the bypass valve 24 is controlled to be opened through the controller 18, and part of cold air is fed into the air after heat exchange in the hot air outlet pipeline 21 through the cold air inlet pipeline 19 to cool, so that the air fed into the burner 1.2 of the molten salt furnace 1 is ensured to meet the process requirements; when the molten salt furnace 1 is stopped, the gate valve 5 is opened, so that the residual flue gas in the molten salt furnace 1 is directly emptied.
The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the utility model.
Claims (8)
1. The molten salt furnace waste heat recycling system comprises a molten salt furnace and is characterized by further comprising an air heat exchanger, a flue gas fan and a sewage tank;
a smoke outlet and a smoke return port are formed in a chimney of the molten salt furnace, and a gate valve is arranged on the chimney between the smoke outlet and the smoke return port;
the smoke outlet is communicated with a smoke inlet at the top of the air heat exchanger through a smoke inlet pipe, a smoke outlet at the bottom of the air heat exchanger is communicated with an inlet of the flue gas fan, and an outlet of the flue gas fan is communicated with the smoke return port through a smoke exhaust pipeline;
a pneumatic cut-off valve is arranged on the smoke exhaust pipeline, a smoke recovery pipe is communicated between the pneumatic cut-off valve and the flue gas fan, and an exhaust port of the smoke recovery pipe is communicated with an aeration main pipe of the sewage tank;
the flue gas recovery pipe is provided with a booster fan, and the flue gas recovery pipe at the air inlet of the booster fan is provided with a first pneumatic regulating valve.
2. The molten salt furnace waste heat recycling system according to claim 1, wherein the upper cover of the sewage pool is provided with a pool cover, and an air outlet on the pool cover is communicated with the exhaust fan through a pipeline.
3. The molten salt furnace waste heat recovery and utilization system of claim 1, further comprising a pressure relief line; one end of the pressure relief pipeline is connected to the smoke recovery pipe at the outlet of the booster fan, and the other end of the pressure relief pipeline is connected to the smoke exhaust pipeline at the outlet of the pneumatic cut-off valve; and a second pneumatic regulating valve is arranged on the pressure relief pipeline.
4. A molten salt furnace waste heat recycling system according to claim 3, wherein a pressure transmitter is mounted on the flue gas recycling pipe at the outlet of the booster fan, the pressure transmitter is electrically connected with a signal input end of a controller, and a signal output end of the controller is electrically connected with the second pneumatic adjusting valve.
5. The molten salt furnace waste heat recycling system according to claim 4, wherein a lower air inlet of the air heat exchanger is communicated with a cold air inlet pipeline, an induced draft fan is installed on the cold air inlet pipeline, an upper air outlet of the air heat exchanger is communicated with a hot air outlet pipeline, and an exhaust port of the hot air outlet pipeline is communicated into a combustor of the molten salt furnace.
6. The molten salt furnace waste heat recycling system according to claim 5, wherein expansion joints are arranged on the flue gas inlet pipe, the flue gas exhaust pipe and the hot air outlet pipe.
7. The molten salt furnace waste heat recycling system according to claim 5, wherein a bypass pipeline is communicated between the cold air inlet pipeline and the hot air outlet pipeline, and a bypass valve is arranged on the bypass pipeline.
8. The molten salt furnace waste heat recycling system according to claim 7, wherein a temperature transmitter is installed at a smoke outlet at the bottom of the air heat exchanger, the temperature transmitter is electrically connected with a signal input end of the controller, and a signal output end of the controller is electrically connected with the bypass valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321206621.6U CN219977124U (en) | 2023-05-17 | 2023-05-17 | Molten salt furnace waste heat recycling system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321206621.6U CN219977124U (en) | 2023-05-17 | 2023-05-17 | Molten salt furnace waste heat recycling system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219977124U true CN219977124U (en) | 2023-11-07 |
Family
ID=88590525
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321206621.6U Active CN219977124U (en) | 2023-05-17 | 2023-05-17 | Molten salt furnace waste heat recycling system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219977124U (en) |
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2023
- 2023-05-17 CN CN202321206621.6U patent/CN219977124U/en active Active
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