CN212005650U - Boiler high temperature flue gas fused salt heat-retaining device - Google Patents

Boiler high temperature flue gas fused salt heat-retaining device Download PDF

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Publication number
CN212005650U
CN212005650U CN202020579516.7U CN202020579516U CN212005650U CN 212005650 U CN212005650 U CN 212005650U CN 202020579516 U CN202020579516 U CN 202020579516U CN 212005650 U CN212005650 U CN 212005650U
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molten salt
self
cooling
type heater
screen type
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时正海
茹宇
高洪培
王海涛
孙献斌
袁野
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Huaneng Clean Energy Research Institute
Huaneng Group Technology Innovation Center Co Ltd
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Huaneng Clean Energy Research Institute
Huaneng Group Technology Innovation Center Co Ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00—Combustion technologies with mitigation potential
    • Y02E20/30—Technologies for a more efficient combustion or heat usage
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/14—Thermal energy storage

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  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)

Abstract

The utility model discloses a boiler high temperature flue gas fused salt heat-retaining device belongs to power plant boiler and industrial boiler technical field. The system comprises a molten salt hot tank, a first regulating valve, an external heat user heat exchanger, a molten salt cold tank, a second regulating valve, a molten salt pump, a self-cooling screen type heater and a self-cooling system; the self-cooling screen type heater heats the molten salt by using the heat of high-temperature flue gas in a boiler hearth, and the quality of the heat input into the molten salt is high due to large heat transfer temperature difference; the whole device has reasonable structural design, can be widely applied to fluidized bed boilers, pulverized coal boilers and other industrial boilers, enables the boilers to adapt to the heat supply requirement with larger heat load change, can increase the heat supply at the peak moment of heat supply, and improves the peak regulation capacity of the unit; the self-cooling system connected with the self-cooling screen type heater can ensure that the self-cooling screen type heater does not exceed the temperature, and the service life of the device is prolonged; and the boiler body is slightly modified, the modification cost is low, the implementation period is short, the system structure is simple, and industrialization is easy to realize.

Description

Boiler high temperature flue gas fused salt heat-retaining device
Technical Field
The utility model belongs to the technical field of power plant boiler and industrial boiler, concretely relates to boiler high temperature flue gas fused salt heat-retaining device.
Background
Circulating fluidized bed boilers are increasingly widely used due to the advantages of low NOx combustion, simple and practical desulfurization process, high combustion efficiency, wide adaptability to coal types, comprehensive utilization of ash and slag, and the like. Along with the development of urban industrial parks, the demand for steam or heat is increased, and each local government advocates the adoption of clean energy, limits the construction of coal-fired units and industrial boilers, and has the phenomenon that the total quantity of heat supply (steam supply) units or heat supply loads of industrial parks is insufficient. Most industrial parks have the periodic variation of heat supply and steam supply, and the load demand to steam (or heat) is great daytime, and the load descends night, and this has just caused daytime heat supply (air feed) and can not satisfy the demand.
Capacity of the existing industrial boiler is increased and modified, the contradiction of steam requirements can be solved, but the declaration work of environmental evaluation is required, and the period is long; and the capacity-increasing transformation workload is large, the transformation technical difficulty is large, and the transformation cost is high.
Disclosure of Invention
In order to solve the defects in the prior art, the utility model aims to provide a boiler high-temperature flue gas fused salt heat storage device, which enables the boiler to adapt to the heat supply requirement with larger heat load change, can increase the heat supply amount at the heat supply peak moment and improve the peak regulation capacity of the unit; and the boiler body is slightly modified, the modification cost is low, the implementation period is short, the system structure is simple, and industrialization is easy to realize.
The utility model discloses a following technical scheme realizes:
the utility model discloses a boiler high-temperature flue gas fused salt heat storage device, which comprises a fused salt hot tank, a first regulating valve, an external heat user heat exchanger, a fused salt cold tank, a second regulating valve and a self-cooling screen type heater;
the outlet of the molten salt hot tank is connected with the inlet of the first regulating valve, the outlet of the first regulating valve is connected with the inlet of the external heat user heat exchanger, the outlet of the external heat user heat exchanger is connected with the inlet of the molten salt cold tank, the outlet of the molten salt cold tank is connected with the inlet of the second regulating valve, the outlet of the second regulating valve is connected with the inlet of the self-cooling screen type heater, and the outlet of the self-cooling screen type heater is connected with the inlet of the molten salt hot tank;
the self-cooling screen type heater is arranged in a boiler furnace and is connected with a self-cooling system.
Preferably, a molten salt pump is arranged between the second regulating valve and the inlet of the self-cooling screen type heater.
Further preferably, a flow meter is provided between the molten salt pump and the inlet of the self-cooling screen heater.
Preferably, both the inlet and the outlet from the cold screen heater are provided with a temperature measurement system and a pressure measurement system.
Further preferably, the self-cooling screen heater comprises a plurality of round tube heating tubes arranged in parallel.
Further preferably, the self-cooling system comprises a steam drum, a downcomer and a plurality of cooling pipes arranged in parallel which are connected through a circulating pipeline; the cooling pipe and the heating pipe are arranged at intervals.
Further preferably, the cooling pipes and the heating pipes are all equidistant from each other.
Further preferably, the cooling pipe and the heating pipe are arranged on the same plane, and the outer walls of the cooling pipe and the heating pipe are provided with protective layers.
Preferably, the outer walls of the molten salt hot tank and the molten salt cold tank are both provided with insulating layers.
Compared with the prior art, the utility model discloses following profitable technological effect has:
the utility model discloses a boiler high temperature flue gas fused salt heat-retaining device, increase fused salt heat-retaining exothermic system and self-cooling system on boiler equipment's basis, the self-cooling screen formula heater utilizes the heat of high temperature flue gas to heat the fused salt in boiler furnace, because the heat transfer difference in temperature is big, inputs fused salt heat quality high; the whole device has reasonable structural design, can be widely applied to fluidized bed boilers, pulverized coal boilers and other industrial boilers, enables the boilers to adapt to the heat supply requirement with larger heat load change, can increase the heat supply at the peak moment of heat supply, and improves the peak regulation capacity of the unit; the self-cooling system connected with the self-cooling screen type heater can ensure that the self-cooling screen type heater does not exceed the temperature, and the service life of the device is prolonged; and the boiler body is slightly modified, the modification cost is low, the implementation period is short, the system structure is simple, and industrialization is easy to realize.
Furthermore, a flowmeter is arranged between the molten salt pump and the inlet of the self-cooling screen type heater, so that the flow of the molten salt in the pipeline can be monitored in real time, and automatic control is realized by matching with the adjustment of the opening degree of the valve.
Furthermore, the inlet and the outlet of the self-cooling screen type heater are respectively provided with a temperature measuring system and a pressure measuring system, so that the temperature and the pressure of molten salt at the inlet and the outlet of the self-cooling screen type heater can be monitored in real time, and the normal operation of the device is ensured.
Furthermore, the cooling pipes and the heating pipes are arranged at intervals, so that each heating pipe can be in the action range of the cooling pipe, the problems of overtemperature and dry combustion when no fused salt flows exist in the heating pipes are solved, and the service life of the device is prolonged.
Furthermore, the distances between the cooling pipe and the heating pipe are equal, the action range of the cooling effect is uniform, and the cooling efficiency is high.
Furthermore, the outer walls of the cooling pipe and the heating pipe are provided with the protective layers, so that the service life of the device is effectively prolonged, and the pipeline is prevented from being abraded.
Furthermore, the outer walls of the molten salt hot tank and the molten salt cold tank are both provided with heat preservation layers, so that heat loss is reduced, and the use efficiency of energy is improved.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention;
3 fig. 3 2 3 is 3 a 3 view 3 from 3 a 3- 3 a 3. 3
In the figure: 1-molten salt hot tank, 2-first regulating valve, 3-external heat user heat exchanger, 4-molten salt cold tank, 5-second regulating valve, 6-molten salt pump, 7-flowmeter, 8-1-first temperature measuring system, 8-2-second temperature measuring system, 9-1-first pressure measuring system, 9-2-second pressure measuring system, 10-self-cooling screen type heater, 10-1-heating pipe, 11-self-cooling system, 11-1-steam drum, 11-2-descending pipe, 11-3-outlet pipeline, 11-4-inlet pipeline, 11-5-cooling pipe and 12-protective layer.
Detailed Description
The invention will be described in further detail with reference to the following drawings and specific examples, which are intended to illustrate and not to limit the invention:
the utility model discloses a boiler high temperature flue gas fused salt heat-retaining device, as shown in figure 1, which comprises a fused salt hot tank 1, a first regulating valve 2, an external heat user heat exchanger 3, a fused salt cold tank 4, a second regulating valve 5, a fused salt pump 6 and a self-cooling screen type heater 10;
an outlet of the molten salt hot tank 1 is connected with an inlet of a first regulating valve 2, an outlet of the first regulating valve 2 is connected with an inlet of an external heat user heat exchanger 3, and an outlet of the external heat user heat exchanger 3 is connected with an inlet of a molten salt cold tank 4; the working medium used by the external heat user heat exchanger 3 is desalted water, hot water or steam is generated after heat exchange, the high-temperature molten salt amount participating in heat exchange is controlled through the first adjusting valve 2, the heat exchange amount is further adjusted, and the hot water or the steam is generated according to the external load requirement. The molten salt can be binary molten nitrate (KNO)3-NaNO3) Or trinary nitrate (NaNO)2-KNO3-NaNO3And Ca (NO)3)2-KNO3-NaNO3Etc.).
An outlet of the molten salt cooling tank 4 is connected with an inlet of a second regulating valve 5, an outlet of the second regulating valve 5 is connected with an inlet of a molten salt pump 6, an outlet of the molten salt pump 6 is connected with an inlet of a self-cooling screen type heater 10, and a flow meter 7, a first temperature measuring system 8-1 and a first pressure measuring system 9-1 are arranged on a pipeline between the molten salt pump 6 and the inlet of the self-cooling screen type heater 10; an outlet of the self-cooling screen type heater 10 is connected with an inlet of the molten salt hot tank 1, and a second temperature measuring system 8-2 and a second pressure measuring system 9-2 are arranged on a pipeline between the outlet of the self-cooling screen type heater 10 and the inlet of the molten salt hot tank 1; the self-cooling screen type heater 10 is arranged in a boiler furnace, and the self-cooling screen type heater 10 comprises a plurality of round pipe type heating pipes 10-1 which are arranged in parallel.
The self-cooling system 11 comprises a steam drum 11-1, a downcomer 11-2, an outlet pipeline 11-3, an inlet pipeline 11-4 and a plurality of cooling pipes 11-5 which are arranged in parallel and connected through a circulating pipeline; the outlet ends of the cooling pipes 11-5 are integrated on the outlet pipeline 11-3, and the inlet ends of the cooling pipes are integrated on the inlet pipeline 11-4; referring to fig. 2, in a preferred embodiment, the cooling pipe 11-5 and the heating pipe 10-1 are disposed on the same plane, and the cooling pipe 11-5 and the heating pipe 10-1 are disposed at equal intervals and connected by a rib plate.
The heating tube 10-1 is made of boiler tube material, including but not limited to 20G, SA210C, 15CrMoG, 12Cr1MoVG, T91, TP304, TP347, etc.
The outer walls of the cooling pipe 11-5, the heating pipe 10-1 and other pipelines arranged in the boiler hearth are provided with protective layers 12, and the protective layers 12 can be made of wear-resistant refractory castable.
The outer walls of the molten salt hot tank 1 and the molten salt cold tank 4 are both provided with heat insulation layers, and aluminum silicate can be used as a heat insulation material.
The molten salt pump 6 may be a GY type molten salt pump.
The boiler high-temperature flue gas fused salt heat storage device is in operation:
when the load of an external heat user is lower at night, the first regulating valve 2 is closed, the second regulating valve 5 and the molten salt pump 6 are opened, low-temperature molten salt enters the self-cooling screen type heater 10, the boiler hearth provides heat for the self-cooling screen type heater 10, and the molten salt is heated and then sent to the molten salt heat tank 1 to store the heat for later use;
when the load of the external hot user is higher in the daytime, the first regulating valve 2 is opened, the second regulating valve 5 and the molten salt pump 6 are closed, the high-temperature molten salt stored in the molten salt hot tank 1 enters the external hot user heat exchanger 3 to supply heat to the external hot user, and the molten salt after heat exchange enters the molten salt cold tank 4 to be stored;
saturated water in the steam drum 11-1 flows out and then passes through the downcomer 11-2, enters the cooling pipe 11-5 through the inlet pipeline 11-4, is changed into steam after absorbing heat, and returns to the steam drum 11-1 along the outlet pipeline 11-3. The self-cooling system 11 runs for a long time along with the whole boiler, and the self-cooling screen type heater 10 is guaranteed not to be over-temperature.
When the heat supply peak is low, the fused salt is utilized to store the heat in a closed circulation mode, and the stored heat is supplied to a heat user when the heat supply peak is up. The peak regulation capacity of the unit can be obviously improved, the utilization rate of energy is improved, and the method has a good application prospect.
It should be noted that the above description is only one of the embodiments of the present invention, and all equivalent changes made by the system described in the present invention are included in the protection scope of the present invention. The technical field of the present invention can be replaced by other embodiments described in a similar manner, without departing from the structure of the present invention or exceeding the scope defined by the claims, which belong to the protection scope of the present invention.

Claims (9)

1. A boiler high-temperature flue gas fused salt heat storage device is characterized by comprising a fused salt hot tank (1), a first regulating valve (2), an external heat user heat exchanger (3), a fused salt cold tank (4), a second regulating valve (5) and a self-cooling screen type heater (10);
an outlet of the molten salt hot tank (1) is connected with an inlet of the first regulating valve (2), an outlet of the first regulating valve (2) is connected with an inlet of an external heat user heat exchanger (3), an outlet of the external heat user heat exchanger (3) is connected with an inlet of the molten salt cold tank (4), an outlet of the molten salt cold tank (4) is connected with an inlet of the second regulating valve (5), an outlet of the second regulating valve (5) is connected with an inlet of the self-cooling screen type heater (10), and an outlet of the self-cooling screen type heater (10) is connected with an inlet of the molten salt hot tank (1);
the self-cooling screen type heater (10) is arranged in a boiler furnace, and the self-cooling screen type heater (10) is connected with a self-cooling system (11).
2. The boiler high-temperature flue gas molten salt heat storage device as claimed in claim 1, wherein a molten salt pump (6) is arranged between the second regulating valve (5) and an inlet of the self-cooling screen type heater (10).
3. The boiler high-temperature flue gas molten salt heat storage device as claimed in claim 2, wherein a flow meter (7) is arranged between the molten salt pump (6) and an inlet of the self-cooling screen type heater (10).
4. The boiler high-temperature flue gas molten salt heat storage device as claimed in claim 1, wherein an inlet and an outlet of a self-cooling screen type heater (10) are provided with a temperature measurement system and a pressure measurement system.
5. The boiler high-temperature flue gas molten salt heat storage device as claimed in claim 1, wherein the self-cooling screen type heater (10) comprises a plurality of circular tube type heating tubes (10-1) arranged in parallel.
6. The boiler high-temperature flue gas molten salt heat storage device according to claim 5, wherein the self-cooling system (11) comprises a steam drum (11-1), a downcomer (11-2) and a plurality of cooling pipes (11-5) which are arranged in parallel and connected through a circulating pipeline; the cooling pipe (11-5) and the heating pipe (10-1) are arranged at intervals.
7. The boiler high-temperature flue gas molten salt heat storage device as claimed in claim 6, wherein distances between the cooling pipe (11-5) and the heating pipe (10-1) are equal.
8. The boiler high-temperature flue gas molten salt heat storage device as claimed in claim 6, wherein the cooling pipe (11-5) and the heating pipe (10-1) are arranged on the same plane, and the outer walls of the cooling pipe (11-5) and the heating pipe (10-1) are provided with a protective layer (12).
9. The boiler high-temperature flue gas molten salt heat storage device according to claim 1, characterized in that the outer walls of the molten salt hot tank (1) and the molten salt cold tank (4) are both provided with insulating layers.
CN202020579516.7U 2020-04-17 2020-04-17 Boiler high temperature flue gas fused salt heat-retaining device Active CN212005650U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202020579516.7U CN212005650U (en) 2020-04-17 2020-04-17 Boiler high temperature flue gas fused salt heat-retaining device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202020579516.7U CN212005650U (en) 2020-04-17 2020-04-17 Boiler high temperature flue gas fused salt heat-retaining device

Publications (1)

Publication Number Publication Date
CN212005650U true CN212005650U (en) 2020-11-24

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