CN217785862U - Calcium carbide furnace gas waste heat recovery system - Google Patents
Calcium carbide furnace gas waste heat recovery system Download PDFInfo
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- CN217785862U CN217785862U CN202221218778.6U CN202221218778U CN217785862U CN 217785862 U CN217785862 U CN 217785862U CN 202221218778 U CN202221218778 U CN 202221218778U CN 217785862 U CN217785862 U CN 217785862U
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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
Abstract
The utility model relates to a calcium carbide furnace gas waste heat recovery system, which comprises a furnace gas waste heat recovery subsystem, an energy storage subsystem, an evaporation subsystem, a deaerator, a water tank and a collecting pipe communicated with the systems; the furnace gas waste heat recovery subsystem comprises an ascending section and a descending section which are connected in sequence through flanges from a furnace gas inlet to a furnace gas outlet; the ascending section comprises at least two furnace gas heat exchangers; the ascending section energy storage medium outlet is connected with the inlet of the high-temperature storage tank; the descending section comprises at least two furnace gas heat exchangers; the descending section energy storage medium inlet is connected with the outlet of the low-temperature storage tank through a regulating valve; and the descending section energy storage medium outlet is connected with the ascending section energy storage medium inlet through a regulating valve. The beneficial effects of the utility model reside in that can retrieve the calcium carbide burner gas waste heat stably high-efficiently and be used for producing high temperature high pressure steam.
Description
Technical Field
The utility model relates to a carbide production high temperature furnace gas waste heat recovery utilizes technical field, especially relates to a carbide furnace gas waste heat recovery system.
Background
At present, the sensible heat of calcium carbide furnace gas is primarily utilized, but most of the problems exist:
(1) The water-cooling interlayer is arranged on the outer shell of the flue to cool the furnace gas, the method for cooling the furnace gas by using cold water can generally heat water to 40-60 ℃, and hot water of the degree can be used as heat supply for plants or residents at most, and the method is only limited to be used in winter; for a factory with a remote site, no matter pipeline transportation or truck transportation, cost is undoubtedly greatly increased, so that most of the collected waste heat is industrial waste heat, and finally, the heat is discharged into the atmosphere, so that the heat cannot be effectively utilized.
(2) The water-cooling interlayer arranged on the outer shell of the flue is matched with the steam drum to produce steam, saturated steam is usually produced by the utilization mode and limited to the influence of the temperature resistance of the water pump, the temperature of the produced saturated steam generally cannot exceed 205 ℃, and the quality of the produced steam is low.
(3) When water is used for cooling the calcium carbide furnace gas, the wall surface temperature of the water cooling flue is low, the wall surface of the flue is easy to coke and deposit dust, the heat exchange efficiency of the furnace gas and the water is reduced, the flue is blocked, and the deposited dust needs to be cleaned regularly; meanwhile, water directly contacts with the calcium carbide to explode, and once water in the water-cooling flue leaks, the water flows into the calcium carbide furnace along the flue to explode.
(4) The Organic Rankine Cycle (ORC) unit is used for generating power after the temperature of the furnace gas is reduced, the influence of temperature resistance of a heat exchange medium is limited, the method can only process the furnace gas below 300 ℃, the heat energy above 300 ℃ is not effectively utilized, and the utilization rate of the waste heat of the furnace gas is low; meanwhile, furnace gas in the industrial production process is always changed periodically, namely, the components, flow and temperature of the furnace gas are changed along with the change of time, so that the electric energy produced by the method is also unstable.
Disclosure of Invention
For solving above-mentioned technical problem, provide one kind can be high-efficient must turn into the recovery system of stable superheated steam with the high-temperature furnace gas waste heat in the carbide production, the utility model provides a following technical scheme:
a calcium carbide furnace gas waste heat recovery system comprises a furnace gas waste heat recovery subsystem, an energy storage subsystem, an evaporation subsystem, a deaerator, a water tank and a collecting pipe communicated with the systems; the energy storage subsystem comprises a high-temperature storage tank, a high-temperature pump arranged at the outlet of the high-temperature storage tank, a low-temperature storage tank and a low-temperature pump arranged at the outlet of the low-temperature storage tank, and is used for storing the heat energy collected in the furnace gas waste heat recovery subsystem and supplying the heat energy to the evaporation subsystem to generate superheated steam;
the furnace gas waste heat recovery subsystem comprises an ascending section and a descending section which are sequentially connected and form a furnace gas channel from a furnace gas inlet to a furnace gas outlet;
the ascending section comprises at least two furnace gas heat exchangers which are sequentially connected, and energy storage medium inlet and outlet pipelines of the furnace gas heat exchangers are mutually connected in parallel;
the descending section comprises at least two furnace gas heat exchangers which are connected in sequence, and energy storage medium inlet and outlet pipelines of the furnace gas heat exchangers are connected in parallel;
the ascending section energy storage medium outlet is connected with the inlet of the high-temperature storage tank; the descending section energy storage medium inlet is connected with the outlet of the low-temperature storage tank through a regulating valve;
and the descending section energy storage medium outlet is connected with the ascending section energy storage medium inlet through a regulating valve.
Furthermore, each furnace gas heat exchanger energy storage medium inlet of the ascending section and each furnace gas heat exchanger energy storage medium inlet of the descending section are respectively provided with an adjusting valve for conveniently controlling the flow of each branch.
Furthermore, the heat exchange areas of all branch furnace gas heat exchangers of the ascending section are consistent; the heat exchange areas of the furnace gas heat exchangers of the branches of the descending section are consistent, so that the uniform distribution of the flow of the energy storage medium is facilitated, and the control of the regulating valve is facilitated.
Furthermore, the outer wall of the furnace gas waste heat recovery subsystem is coated with the heat insulation layer, so that heat loss in the waste heat recovery process can be reduced, and the recovery efficiency is further improved.
Furthermore, the energy storage medium in the energy storage subsystem is one of fused salt, conduction oil or other heat storage media, and because water and carbide direct contact can explode, in order to avoid energy storage medium leakage to cause the potential safety hazard, therefore preferentially select the fused salt.
Furthermore, the evaporation subsystem is provided with a water inlet, a steam outlet, an energy storage medium inlet and an energy storage medium outlet; the water inlet is connected with the water tank through a deaerator; the steam outlet outputs final superheated steam; the energy storage medium inlet is connected with the outlet of the high-temperature storage tank; the energy storage medium outlet is connected with the inlet of the low-temperature storage tank.
The beneficial effects of the utility model reside in that:
1. the ascending section and the descending section are both provided with a plurality of furnace gas heat exchangers connected in parallel, so that the heat exchange of high-temperature furnace gas can be realized more efficiently, and the temperature of an energy storage medium is prevented from exceeding the temperature resistance limit of a high-low temperature storage tank;
2. the multi-branch design can reduce the pumping pressure requirements of a high-temperature pump and a low-temperature pump, thereby reducing the overall cost;
3. the high-temperature storage tank and the low-temperature storage tank are used as storage containers of energy storage media, so that the buffer effect can be achieved, and the continuous and stable operation of the whole system can be guaranteed.
Drawings
Fig. 1 is a schematic system diagram of an embodiment of the present invention.
FIG. 2 is a schematic structural diagram of a furnace gas waste heat recovery subsystem according to an embodiment of the present invention.
In the figure: 1. a furnace gas waste heat subsystem; 11. a rising section; 12. a descending section; 13. a flange; 21. a high-temperature storage tank; 22. a high temperature pump; 23. a low-temperature storage tank; 24. a cryopump; 31. an evaporation subsystem; 32. a deaerator; 33. a water tank; 100. adjusting a valve; 101. a furnace gas heat exchanger.
Detailed Description
The following detailed description of the embodiments of the present invention is made with reference to the accompanying drawings and examples. The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention.
The calcium carbide furnace gas waste heat recovery system shown in fig. 1 comprises a furnace gas waste heat recovery subsystem 1, an energy storage subsystem and evaporation subsystem 31, a deaerator 32, a water tank 33 and a collecting pipe communicated with the systems; the energy storage subsystem comprises a high-temperature storage tank 21, a high-temperature pump 22 arranged at the outlet of the high-temperature storage tank 21, a low-temperature storage tank 23 and a low-temperature pump 24 arranged at the outlet of the low-temperature storage tank 23, and is used for storing the heat energy collected in the furnace gas waste heat recovery subsystem 1 and supplying the heat energy to the evaporation subsystem 31 to generate superheated steam; and inputting the power into a subsequent steam turbine set for power generation.
In this embodiment, the energy storage medium is molten salt, the high-temperature storage tank 21 is a high-temperature molten salt tank, and the low-temperature storage tank 23 is a low-temperature molten salt tank.
The furnace gas waste heat recovery subsystem 1 comprises an ascending section 11 and a descending section 12 which are sequentially connected through a flange 13 and form a furnace gas channel from a furnace gas inlet to a furnace gas outlet.
The ascending section 11 and the descending section 12 of the embodiment both include four furnace gas heat exchangers 101 sequentially connected through flanges, energy storage medium inlet and outlet pipelines of the furnace gas heat exchangers 101 of each branch are connected in parallel, and an energy storage medium inlet of each branch furnace gas heat exchanger 101 is provided with an adjusting valve 100; in practical use, the number of the furnace gas heat exchangers 101 of the ascending section 11 and the descending section 12 can be set to be consistent or inconsistent.
The outlet of the energy storage medium of the ascending section 11 is connected with the inlet of the high-temperature storage tank 21; the inlet of the energy storage medium of the descending section 12 is connected with the outlet of the low-temperature storage tank 23 through a regulating valve 100;
the energy storage medium outlet of the descending section 12 is connected with the energy storage medium inlet of the ascending section 11 through a regulating valve 100.
The heat exchange areas of the branch furnace gas heat exchangers 101 of the ascending section 11 are consistent; the heat exchange areas of the branch furnace gas heat exchangers 101 of the descending section 12 are consistent, which is beneficial to the uniform distribution of the flow of the energy storage medium and is convenient for the control of the regulating valve 100.
The outer wall of the furnace gas waste heat recovery subsystem 1 is coated with the heat-insulating layer, so that heat loss in the waste heat recovery process can be reduced, the recovery efficiency is further improved, and the heat-insulating layer can be made of a high-temperature-resistant heat-insulating aerogel heat-insulating material.
The evaporation subsystem 31 is provided with a water inlet, a steam outlet, an energy storage medium inlet and an energy storage medium outlet; the water inlet is connected with a water tank 33 through a deaerator 32; the steam outlet outputs final superheated steam; the energy storage medium inlet is connected with the outlet of the high-temperature storage tank 21; the outlet of the energy storage medium is connected with the inlet of the low-temperature storage tank 23.
In this embodiment, the evaporation subsystem 31 includes a superheater, an evaporator, and a preheater sequentially connected from the high-temperature storage tank 21 to the low-temperature storage tank 23.
The media paths in the system are:
1. furnace gas: calcium carbide furnace → ascending section 11 → descending section 12 → discharge the system for tail gas post-treatment;
2. molten salt: the low-temperature storage tank 23 → the low-temperature pump 24 → the descent section 12 → the ascent section 11 → the high-temperature storage tank 21 → the vaporization subsystem 31 → the low-temperature storage tank 23, thereby forming a closed loop circuit;
3. water/steam: the water tank 33 → the deaerator 32 → the evaporation subsystem 31 → the steam turbine set for generating power after being output from the system.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, it should be noted that, for those skilled in the art, a plurality of modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (6)
1. A calcium carbide furnace gas waste heat recovery system comprises a furnace gas waste heat recovery subsystem, an energy storage subsystem, an evaporation subsystem, a deaerator, a water tank and a collecting pipe communicated with the systems; the energy storage subsystem comprises a high-temperature storage tank, a high-temperature pump arranged at the outlet of the high-temperature storage tank, a low-temperature storage tank and a low-temperature pump arranged at the outlet of the low-temperature storage tank, and is used for storing the heat energy collected in the furnace gas waste heat recovery subsystem and supplying the heat energy to the evaporation subsystem to generate superheated steam; the method is characterized in that:
the furnace gas waste heat recovery subsystem comprises an ascending section and a descending section which are sequentially connected and form a furnace gas channel from a furnace gas inlet to a furnace gas outlet;
the ascending section comprises at least two furnace gas heat exchangers which are sequentially connected, and energy storage medium inlet and outlet pipelines of the furnace gas heat exchangers are mutually connected in parallel;
the descending section comprises at least two furnace gas heat exchangers which are connected in sequence, and energy storage medium inlet and outlet pipelines of the furnace gas heat exchangers are connected in parallel;
the ascending section energy storage medium outlet is connected with the inlet of the high-temperature storage tank; the descending section energy storage medium inlet is connected with the outlet of the low-temperature storage tank through a regulating valve;
and the descending section energy storage medium outlet is connected with the ascending section energy storage medium inlet through a regulating valve.
2. The calcium carbide furnace gas waste heat recovery system of claim 1, wherein: and the energy storage medium inlets of the furnace gas heat exchangers of the ascending section and the descending section are respectively provided with an adjusting valve.
3. The calcium carbide furnace gas waste heat recovery system of claim 1, wherein: the heat exchange areas of the branch furnace gas heat exchangers of the ascending section are consistent; and the heat exchange areas of the branch furnace gas heat exchangers of the descending section are consistent.
4. The calcium carbide furnace gas waste heat recovery system of claim 1, wherein: and the outer wall of the furnace gas waste heat recovery subsystem is coated with an insulating layer.
5. The calcium carbide furnace gas waste heat recovery system of claim 1, wherein: the energy storage medium in the energy storage subsystem is one of molten salt or heat conducting oil.
6. The calcium carbide furnace gas waste heat recovery system of claim 1, wherein: the evaporation subsystem is provided with a water inlet, a steam outlet, an energy storage medium inlet and an energy storage medium outlet; the water inlet is connected with the water tank through a deaerator; the steam outlet outputs final superheated steam; the energy storage medium inlet is connected with the outlet of the high-temperature storage tank; the energy storage medium outlet is connected with the inlet of the low-temperature storage tank.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221218778.6U CN217785862U (en) | 2022-05-20 | 2022-05-20 | Calcium carbide furnace gas waste heat recovery system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221218778.6U CN217785862U (en) | 2022-05-20 | 2022-05-20 | Calcium carbide furnace gas waste heat recovery system |
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| CN217785862U true CN217785862U (en) | 2022-11-11 |
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| CN202221218778.6U Active CN217785862U (en) | 2022-05-20 | 2022-05-20 | Calcium carbide furnace gas waste heat recovery system |
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- 2022-05-20 CN CN202221218778.6U patent/CN217785862U/en active Active
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