CN210267455U - Fused salt heat storage peak regulation heating system utilizing flue gas waste heat - Google Patents
Fused salt heat storage peak regulation heating system utilizing flue gas waste heat Download PDFInfo
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- CN210267455U CN210267455U CN201921066992.2U CN201921066992U CN210267455U CN 210267455 U CN210267455 U CN 210267455U CN 201921066992 U CN201921066992 U CN 201921066992U CN 210267455 U CN210267455 U CN 210267455U
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Abstract
The fused salt heat storage and peak regulation heating system utilizing the waste heat of the flue gas consists of three parts, wherein the first part is a flue gas-fused salt heat exchanger system, volatile organic compounds are introduced into a heat storage type thermal incinerator to obtain high-temperature flue gas, the obtained high-temperature flue gas exchanges heat with low-temperature fused salt, the low-temperature fused salt exchanges heat to obtain high-temperature fused salt, the purpose of heat storage is achieved, and the fused salt heat storage and peak regulation heating system also serves as the foundation of the whole peak regulation heating system; the second part is a molten salt-steam heat exchange system which is connected with the high-temperature molten salt obtained by heat exchange of the first part and exchanges heat between the high-temperature molten salt and water to obtain superheated steam; the third part is a steam-water heat exchange system, and the obtained superheated steam exchanges heat with circulating water for heating so as to finally meet the purpose of heating. The utility model discloses can become the heat energy that can supply the utilization with the burning of environmental pollutant volatile organic compound, not only can satisfy the effect of peak shaving heating, if direct high temperature steam with the over heater export changes over to the steam turbine moreover, can become a means of peak shaving electricity generation equally.
Description
Technical Field
The utility model relates to an utilize fused salt heat-retaining peak shaver heating system of flue gas waste heat to carry out the heat-retaining utilization with the fused salt, belong to energy conversion and storage technical field.
Background
The utilization of the waste heat of the boiler flue gas is always widely paid attention to as an important way for energy conservation and emission reduction, and thus, numerous scholars also put forward various utilization means for the waste heat of the flue gas.
The types of the flue gas are various, the quality of the flue gas generated by the boiler is determined by the types of the boiler, the temperature of the flue gas generated by most boilers is not high, the utilization of heat in the flue gas is complicated, and the purpose of large-scale utilization is not achieved.
In chemical production, coal mine and petroleum exploitation, straws can generate a large amount of Volatile Organic Compounds (VOCs) when being improperly combusted, the calorific value of the gases is usually very high, when a Regenerative Thermal Oxidizer (RTO) is used for treating the part of flue gas, the obtained flue gas can reach very high temperature, the general temperature can reach about 900 ℃, the part of high-temperature flue gas cannot be directly discharged into the air, the environment can be polluted, a large amount of heat in the flue gas can be wasted, the grade of the part of heat is very high, and therefore, the utilization of energy in this respect also becomes a hotspot researched by technical personnel in the field.
The fused salt heat storage is an important ring in the solar photo-thermal power generation technology, and high-temperature flue gas from a heat accumulating type thermal incinerator (RTO) can be converted into fused salt for storage through a fused salt heat exchanger, so that the fused salt heat storage can be used as a new means for peak regulation and heating.
Disclosure of Invention
The utility model aims at providing a flue gas that Volatile Organic Compounds (VOCs) burning produced for example, has proposed a series of heat transfer systems, has solved volatile organic compounds's processing utilization and how to dump the problem of heat energy, finally converts the energy in the flue gas into the heat energy of aquatic to this provides a neotype system that is used for the peak regulation heating.
In order to solve the problem, the technical scheme of the utility model provide an utilize fused salt heat-retaining peak regulation heating system of flue gas waste heat, including high temperature fused salt pump, over heater, cauldron formula evaporimeter, its characterized in that: the system consists of a flue gas-molten salt heat exchanger system, a molten salt-steam heat exchange system and a steam-water heat exchange system;
volatile organic compounds firstly enter a heat accumulating type thermal incinerator to be combusted to generate high-temperature flue gas, the high-temperature flue gas enters a flue gas-molten salt heat exchanger to serve as a main heat source, low-temperature molten salt from a low-temperature molten salt tank exchanges heat with the flue gas in the flue gas-molten salt heat exchanger, the obtained high-temperature molten salt enters a high-temperature molten salt tank, wherein the power supply source of the flue gas is from feeding air of initial combustion, and the power of the molten salt is provided by a low-temperature molten salt pump;
the molten salt-steam heat exchange system is characterized in that feed water starts from a condensate water tank, the feed water passes through a preheater and a flue gas-molten salt heat exchanger to heat the water to a state similar to saturated water, the saturated water is heated to saturated steam through a kettle type evaporator, the obtained saturated steam exchanges heat with the superheater to obtain target superheated steam, high-temperature molten salt firstly flows from the superheater, then flows through the kettle type evaporator, flows through the preheater and finally flows back to a low-temperature molten salt tank, wherein the power of the molten salt is provided by a high-temperature molten salt pump, and the power of the feed water is provided by a condensate water pump;
the steam-water heat exchange system exchanges heat with water for heating users in the condenser through superheated steam from the outlet of the superheater to complete the whole cycle.
Preferably, the flue gas-molten salt heat exchanger adopts a tube box type heat exchanger as a heat exchanger, wherein, in the tube box type heat exchanger, molten salt flows from the inside of the pipeline, flue gas flows from the outside of the pipeline, the heat exchanger adopts a counter-flow arrangement and is used for isolating the environment, a layer of heat insulating material is coated on the outer layer of the tube box type heat exchanger, and a layer of auxiliary heat facility is arranged on the heat insulating material.
Preferably, the molten salt species is HTS, in particular KNO3-NaNO2-NaNO3The mass fractions are 53%, 40% and 7%, respectively, the temperature of the high-temperature molten salt is 500 ℃, and the temperature of the low-temperature molten salt is 200 ℃.
Preferably, the high-temperature molten salt tank and the low-temperature molten salt tank are both in a structure with a round top, a flat bottom surface and a cylindrical periphery, and normal pressure is kept in the high-temperature molten salt tank and the low-temperature molten salt tank; the flat bottom surface is built by fireproof bricks, and a heat-resistant coating, generally heat-resistant glass, is arranged on the flat bottom surface; the cylinder wall body adopt three layer construction, the inlayer is the steel layer for playing the structural support effect, the intermediate level is thermal insulation material, prevents with the contact heat dissipation of air, the outmost thin aluminium lamination plays isolated environment's purpose, the molten salt jar inlayer sets up a plurality of immersion heater, keeps the mobility of molten salt.
Preferably, the molten salt in the molten salt-steam heat exchange system flows through a pipeline, and is subjected to heat exchange by a superheater, a kettle-type evaporator and a preheater in sequence to heat feed water into superheated steam, wherein the feed water temperature of the preheater is 180 ℃, 2MPa, and the outlet temperature of the preheater is approximately saturated water at 210 ℃; then introducing the part of nearly saturated water into a kettle-type evaporator, wherein molten salt in the kettle-type evaporator flows out of a pipe, water flows out of the pipe, and the part of nearly saturated water is heated to be changed into saturated steam, wherein the water saturation temperature of 2MPa is 212.13 ℃; and finally, introducing saturated steam into a superheater, wherein the superheater has the same structure of a U-shaped tube box type heat exchanger, the superheater and the preheater have the same structure, molten salt flows out of a tube, steam flows in the tube, and finally the steam is heated to 450 ℃.
Preferably, the superheated steam enters a condenser for condensation, is cooled to 180 ℃ and 2MPa finally after heat exchange, enters a condensate tank and is used as circulating water of a molten salt-steam heat exchange system.
The utility model discloses reliable and stable has very big realizability, can the energy saving, the environmental protection, the utility model discloses there is following beneficial effect:
(1) the Volatile Organic Compounds (VOCs) of the environmental pollutants can be combusted to be available heat energy, and the method is one of treatment modes aiming at pollution sources.
(2) The method has extremely strong popularization, and not only can be utilized in the recovery of the waste heat of the flue gas containing organic compounds (VOCs), but also can play an effective heat utilization role in equipment such as general waste incineration and straw treatment.
(3) The molten salt and the flue gas are used for heat exchange, the molten salt tank is used for storing the high-temperature molten salt tank, and then the high-temperature molten salt tank exchanges heat with heating water, so that the purpose of peak regulation and heating is achieved, energy is saved, and reasonable distribution can be carried out on the energy.
(4) The steam level is added from the fused salt to the middle of the heating water, because the temperature of the high-temperature fused salt can reach about 500 ℃, the direct heat exchange with the lower-temperature heating water cannot be realized directly (the temperature of the heating water is generally lower than 95 ℃), the higher temperature difference is not only an examination on the performance of the self pipeline material, but also the heat exchange is easy and uneven, the frozen blockage of the fused salt is easily caused, the steam level is added in the middle, and the problem can be effectively avoided.
(5) The system not only can meet the effect of peak shaving heating, but also can be an optional means of peak shaving power generation if high-temperature steam at the outlet of the superheater is directly transferred into the steam turbine.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of the structure of a pipe box type heat exchanger in the flue gas-molten salt heat exchanger of the present invention;
FIG. 3 is a schematic structural diagram of the high-temperature molten salt tank and the low-temperature molten salt tank of the present invention;
FIG. 4 is a schematic view of a molten salt-steam heat exchanger system of the present invention;
in the figure: 1 in the figure 1. a regenerative thermal oxidizer; 2. a flue gas-molten salt heat exchanger; 3. an outlet flue gas treatment device; 4. a high temperature molten salt tank; 5. a high temperature molten salt pump; 6. a superheater; 7. a kettle-type evaporator; 8. a preheater; 9. a low temperature molten salt tank; 10. a low temperature molten salt pump; 11. a condensate tank; 12. a condenser; 13. a condensate pump; 14. a heating user; 15. an upper cone; 16. a heat exchanger box body; 17. a heat exchanger tube bundle; 18. a lower cone; 19. a thermal insulation material; 20. a dome; 21. a cylindrical shape; 22. a flat bottom surface; 23. a molten salt inlet; 24. superheated steam; 25. saturated steam; 26. water supply; 27 molten salt outlet.
Detailed Description
In order to make the purpose, technical solution and beneficial technical effects of the present invention clearer, the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments;
according to actual conditions, the temperature of the high-temperature molten salt is 500 ℃, the temperature of the low-temperature molten salt is 200 ℃, and the temperature of the heating water is 95/70 ℃ circulating water generally.
As shown in figure 1, a fused salt heat storage peak regulation heating system using flue gas waste heat comprises a high-temperature fused salt pump, a superheater and a kettle-type evaporator, and is characterized in that: the system consists of a flue gas-molten salt heat exchanger system, a molten salt-steam heat exchange system and a steam-water heat exchange system;
volatile organic compounds firstly enter a heat accumulating type thermal incinerator to be combusted to generate high-temperature flue gas, the high-temperature flue gas enters a flue gas-molten salt heat exchanger to serve as a main heat source, low-temperature molten salt from a low-temperature molten salt tank exchanges heat with the flue gas in the flue gas-molten salt heat exchanger, the obtained high-temperature molten salt enters a high-temperature molten salt tank, wherein the power supply source of the flue gas is from feeding air of initial combustion, and the power of the molten salt is provided by a low-temperature molten salt pump;
the molten salt-steam heat exchange system is characterized in that feed water starts from a condensate water tank, the feed water passes through a preheater and a flue gas-molten salt heat exchanger to heat the water to a state similar to saturated water, the saturated water is heated to saturated steam through a kettle type evaporator, the obtained saturated steam exchanges heat with the superheater to obtain target superheated steam, high-temperature molten salt firstly flows from the superheater, then flows through the kettle type evaporator, flows through the preheater and finally flows back to a low-temperature molten salt tank, wherein the power of the molten salt is provided by a high-temperature molten salt pump, and the power of the feed water is provided by a condensate water pump;
the steam-water heat exchange system exchanges heat with water for heating users in the condenser through superheated steam from the outlet of the superheater to complete the whole cycle.
In a flue gas-molten salt heat exchanger system, the flue gas-molten salt heat exchanger is mainly used, the temperature of a flue gas inlet is 900 ℃, then the flue gas inlet directly exchanges heat with molten salt, the temperature of the low-temperature molten salt is raised to 500 ℃, and a tube box type heat exchanger is selected because the ratio of the volumetric heat capacity at the two sides of the heat exchanger is too large.
The condensed water tank is arranged at the outlet of the condenser and used for collecting steam condensed water; the condensed water pump is arranged at the inlet of the kettle-type evaporator, provides the feed water for the previous molten salt-steam heat exchanger, is water treatment equipment and plays a role in stabilizing and circulating the whole system.
The molten salt is HTS, is a eutectic mixture consisting of a chemically pure nitrate mixture, and is commonly adopted in the industry and is also called HTS.
As shown in fig. 2, the tube-box heat exchanger is composed of four parts:
the first part is an upper cone which mainly has the function of rectification, and the upper end surface of the upper cone is provided with a circular smoke inlet connected with a conical smoke channel.
The second part is a heat exchanger main body part consisting of a heat exchanger box body and a heat exchanger tube bundle, and due to the physical characteristics of molten salt, the pressure drop of the molten salt is designed to be as small as possible, the resistance in the tube is designed to be as small as possible, and if the flow resistance in the tube is too large, the molten salt is easy to exchange heat unevenly, so that the frozen blockage of the pipeline is caused.
The third part is a lower cone which is the same as the upper cone, the lower cone has the main function of collecting heat-exchanged flue gas, and the composition of the lower cone is similar to that of the upper cone.
As shown in fig. 3, the molten salt tank is composed of two parts, i.e., a cold salt tank and a hot salt tank, in which the temperature of the low-temperature molten salt is 200 ℃, and the temperature is low, and carbon steel can be used as its main material in the design. The temperature of the high-temperature molten salt is very high, 500 ℃, and stainless steel should be selected as the material. The molten salt tank adopts a dome, flat bottom surface and cylindrical structure, and the normal pressure is kept in the tank; the flat bottom surface is built by fireproof bricks, and a heat-resistant coating, generally heat-resistant glass, is arranged on the flat bottom surface; the cylinder wall body adopt three layer construction, the inlayer is the steel layer for playing the structural support effect, the intermediate level is thermal insulation material, prevents with the contact heat dissipation of air, the outmost thin aluminium lamination plays isolated environment's purpose, the molten salt jar inlayer sets up a plurality of immersion heater, keeps the mobility of molten salt.
As shown in fig. 4, in the molten salt-steam heat exchanger system, molten salt flows through a pipeline, passes through a superheater, a kettle evaporator and a preheater in sequence for heat exchange, and heats feed water into superheated steam.
The preheater adopts a U-shaped tube box type heat exchanger, molten salt flows out of the tube, water flows in the tube, the water supply temperature is 180 ℃, 2MPa, and the outlet temperature is approximately saturated water of 210 ℃; then introducing the part of nearly saturated water into a kettle-type evaporator, wherein molten salt in the kettle-type evaporator flows out of a pipe, water flows out of the pipe, and the part of nearly saturated water is heated to be changed into saturated steam, wherein the water saturation temperature of 2MPa is 212.13 ℃; and finally, introducing saturated steam into a superheater, wherein the superheater has the same structure of a U-shaped shell-and-tube heat exchanger, the superheater and the preheater have the same structure, molten salt flows out of a tube, steam flows in the tube, and finally the steam is heated to 450 ℃.
As shown in FIG. 1, in the steam-water heat exchange system, the theoretical temperature of the steam from the upper stage is 450 ℃ and 2MPa, the heat exchanger is also a tube-box type heat exchanger, the temperature of the circulating water for heating flowing outside the tube is 70/95 ℃ and 0.5MPa, and the temperature of the superheated steam flowing out of the steam-water heat exchanger is 180 ℃.
The foregoing examples are given for the purpose of illustrating the present invention in a clear and non-restrictive manner, and it will be apparent to those skilled in the art that variations and modifications of the present invention may be made in other variations and modifications based on the foregoing description, and it is not necessary or necessary to exhaustively enumerate all embodiments, and all such variations and modifications as are obvious and desirable in the art are within the scope of the present invention.
Claims (6)
1. Utilize fused salt heat-retaining peak regulation heating system of flue gas waste heat, including high temperature fused salt pump, over heater, cauldron formula evaporimeter, its characterized in that: the system consists of a flue gas-molten salt heat exchanger system, a molten salt-steam heat exchange system and a steam-water heat exchange system;
volatile organic compounds firstly enter a heat accumulating type thermal incinerator to be combusted to generate high-temperature flue gas, the high-temperature flue gas enters a flue gas-molten salt heat exchanger to serve as a main heat source, low-temperature molten salt from a low-temperature molten salt tank exchanges heat with the flue gas in the flue gas-molten salt heat exchanger, the obtained high-temperature molten salt enters a high-temperature molten salt tank, wherein the power supply source of the flue gas is from feeding air of initial combustion, and the power of the molten salt is provided by a low-temperature molten salt pump;
the molten salt-steam heat exchange system is characterized in that feed water starts from a condensate water tank, the feed water passes through a preheater and a flue gas-molten salt heat exchanger to heat the water to a state similar to saturated water, the saturated water is heated to saturated steam through a kettle type evaporator, the obtained saturated steam exchanges heat with the superheater to obtain target superheated steam, high-temperature molten salt firstly flows from the superheater, then flows through the kettle type evaporator, flows through the preheater and finally flows back to a low-temperature molten salt tank, wherein the power of the molten salt is provided by a high-temperature molten salt pump, and the power of the feed water is provided by a condensate water pump;
the steam-water heat exchange system exchanges heat with water for heating users in the condenser through superheated steam from the outlet of the superheater to complete the whole cycle.
2. The molten salt heat storage peak-shaving heating system using flue gas waste heat according to claim 1, characterized in that: the flue gas-molten salt heat exchanger adopts a tube box type heat exchanger, molten salt flows from the inside of a pipeline in the tube box type heat exchanger, flue gas flows from the outside of the pipeline, the heat exchanger is arranged in a countercurrent mode and used for isolating the environment, a layer of heat insulating material is coated on the outer layer of the tube box type heat exchanger, and a layer of auxiliary heating facilities is arranged on the heat insulating material.
3. The molten salt heat storage peak-shaving heating system using flue gas waste heat according to claim 1 or 2, characterized in that: the molten salt is HTS, specifically KNO3-NaNO2-NaNO3The mass fractions are 53%, 40% and 7%, respectively, the temperature of the high-temperature molten salt is 500 ℃, and the temperature of the low-temperature molten salt is 200 ℃.
4. The molten salt heat storage peak-shaving heating system using flue gas waste heat according to claim 1, characterized in that: the high-temperature molten salt tank and the low-temperature molten salt tank are both in structures with round tops, flat bottoms and cylindrical peripheries, and normal pressure is kept in the high-temperature molten salt tank and the low-temperature molten salt tank; the flat bottom surface is built by fireproof bricks, and a heat-resistant coating, generally heat-resistant glass, is arranged on the flat bottom surface; the cylinder wall body adopt three layer construction, the inlayer is the steel layer for playing the structure support effect, the intermediate level is thermal insulation material, prevents with the contact heat dissipation of air, the outmost thin aluminium lamination plays isolated environment's purpose, the molten salt jar inlayer is provided with a plurality of immersion heater, keeps the mobility of molten salt.
5. The molten salt heat storage peak-shaving heating system using flue gas waste heat according to claim 1, characterized in that: molten salt in the molten salt-steam heat exchange system flows through a pipeline, and is subjected to heat exchange by a superheater, a kettle-type evaporator and a preheater in sequence, so that feed water is heated into superheated steam, the feed water temperature of the preheater is 180 ℃, 2MPa, and the outlet temperature of the preheater is approximately saturated water at 210 ℃; then introducing the part of nearly saturated water into a kettle-type evaporator, wherein molten salt in the kettle-type evaporator flows out of a pipe, water flows out of the pipe, and the part of nearly saturated water is heated to be changed into saturated steam, wherein the water saturation temperature of 2MPa is 212.13 ℃; and finally, introducing saturated steam into a superheater, wherein the superheater has the same structure of a U-shaped tube box type heat exchanger, the superheater and the preheater have the same structure, molten salt flows out of a tube, steam flows in the tube, and finally the steam is heated to 450 ℃.
6. The molten salt heat storage peak-shaving heating system using flue gas waste heat according to claim 1 or 5, characterized in that: the superheated steam enters a condenser for condensation, is cooled to 180 ℃ and 2MPa finally after heat exchange, enters a condensate tank and is used as circulating water of a molten salt-steam heat exchange system.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110274293A (en) * | 2019-07-10 | 2019-09-24 | 江苏飞跃机泵集团有限公司 | A kind of fused salt heat accumulation peak heating system using fume afterheat |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110274293A (en) * | 2019-07-10 | 2019-09-24 | 江苏飞跃机泵集团有限公司 | A kind of fused salt heat accumulation peak heating system using fume afterheat |
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