CN109611819B - Improve economizer of SCR system low-load operation denitration ability - Google Patents

Improve economizer of SCR system low-load operation denitration ability Download PDF

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Publication number
CN109611819B
CN109611819B CN201811556769.6A CN201811556769A CN109611819B CN 109611819 B CN109611819 B CN 109611819B CN 201811556769 A CN201811556769 A CN 201811556769A CN 109611819 B CN109611819 B CN 109611819B
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heat
pipe
radiating
air guide
heat absorption
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CN109611819A (en
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潘卫国
李道林
王文欢
姜未汀
潘丹露
贾鹏谣
秦岭
黄春迎
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Shanghai University of Electric Power
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Shanghai University of Electric Power
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
    • F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J15/00—Arrangements of devices for treating smoke or fumes
    • F23J15/02—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J15/00—Arrangements of devices for treating smoke or fumes
    • F23J15/06—Arrangements of devices for treating smoke or fumes of coolers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F1/00—Tubular elements; Assemblies of tubular elements
    • F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
    • F28F1/12—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
    • F28D2021/0019—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for
    • 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

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Geometry (AREA)
  • Exhaust Gas Treatment By Means Of Catalyst (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)

Abstract

The invention relates to a coal economizer for improving the denitration capability of an SCR system during low-load operation, which comprises an air guide grid and a heat conduction device, wherein the air guide grid is formed by sequentially arranging a plurality of grid layers, the air guide grid is provided with an installation hole, and a hot water pipe penetrates through the installation hole to be matched and connected with the air guide grid; the heat conduction device comprises a heat absorption pipe, a radiating pipe and a pressurizing mechanism, wherein two ends of the heat absorption pipe are respectively connected with two ends of the radiating pipe, and the pressurizing mechanism is arranged at the joint of the heat absorption pipe and the radiating pipe; heat conducting media are arranged in the heat absorption pipe and the radiating pipe; the heat absorption pipe is arranged between the grating layers, and the heat dissipation pipe is arranged at the flue gas inlet of the SCR reactor. Compared with the prior art, the invention can transfer the heat of the economizer to the SCR reactor, is beneficial to improving the denitration capability of the SCR system, and has the advantages of simple structure, convenient installation, good heat exchange effect, wide application range and the like.

Description

Improve economizer of SCR system low-load operation denitration ability
Technical Field
The invention relates to an economizer, in particular to an economizer for improving the denitration capability of an SCR system during low-load operation.
Background
The economizer is a device which is arranged at the lower part of a flue at the tail part of a boiler and used for recovering the waste heat of exhausted smoke, heats the water fed by the boiler into a heating surface of saturated water under the pressure of a steam drum, and is called as the economizer because the economizer absorbs the heat of high-temperature smoke, reduces the exhaust temperature of the smoke, saves energy and improves the efficiency.
SCR is the most mature flue gas denitration technology at present, is a denitration method after the furnace, is the earliest to complete commercial operation in the late stage of 60-70 years of the 20 th century from Japan, and utilizes a reducing agent (NH3, urea) to selectively react with NOx to generate N under the action of a metal catalyst2And H2O instead of by O2Oxidation is therefore referred to as "selectivity". The worldwide popular SCR process is mainly divided into ammonia method SCR and urea method SCR2And (4) seed preparation. The 2 methods all utilize the reduction function of ammonia on NOx to reduce the NOx (mainly NO) into N2 and water which have little influence on the atmosphere under the action of a catalyst, and the reducing agent is NH3。
The catalyst used in SCR is mostly TiO2As a carrier, with V2O5Or V2O5-WO3Or V2O5-MoO3Is used as active component and is made into honeycomb type, plate type or corrugated type. The SCR catalyst applied to flue gas denitration can be divided into a high-temperature catalyst (345-590 ℃), a medium-temperature catalyst (260-380 ℃) and a low-temperature catalyst (80-300 ℃), and the suitable reaction temperatures of different catalysts are different. If the reaction temperature is lower, the activity of the catalyst is reduced, resulting in a decrease in denitration efficiency, and if the catalyst is continuously operated at a low temperature, the catalyst is permanently damaged; if the reaction temperature is too high, NH3 is easily oxidized, NOxThe increased amount of the product also causes a phase change of the catalyst material, which deteriorates the activity of the catalyst. At home and abroad, the SCR system mostly adopts high temperature, and the reaction temperature range is 315-400 ℃.
At present, a method for improving the smoke temperature of an inlet of an SCR (selective catalytic reduction) reactor adopts high-temperature smoke for heating, namely high-temperature smoke is led out from the front of a boiler economizer or the front of a low-temperature superheater and is mixed with the smoke at the inlet of the SCR reactor through a bypass flue and an adjusting baffle to adjust the smoke temperature at the inlet of the reactor, but the method requires a system to have higher tightness and flexibility, if the system is not closed tightly due to deformation, a large amount of high-temperature smoke is leaked, the efficiency of the boiler is influenced, and the temperature distribution after mixing is not uniform due to airflow disturbance during mixing of the smoke; at present, the smoke temperature is improved by a technical means of sectional arrangement of the coal economizer, and a part of coal economizer area patents are arranged in a flue behind an SCR reactor, but the method has large modification workload and high investment cost.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide the economizer for improving the denitration capacity of the SCR system during low-load operation.
The purpose of the invention can be realized by the following technical scheme:
the economizer for improving the denitration capability of the SCR system during low-load operation comprises an air guide grid, wherein the air guide grid is formed by sequentially arranging a plurality of grid layers, mounting holes are formed in the grid layers, and hot water pipes penetrate through the mounting holes to be connected with the air guide grid in a matched manner;
the invention also comprises a heat conducting device;
the heat conduction device comprises a heat absorption pipe, a radiating pipe and a supercharging mechanism, wherein two ends of the heat absorption pipe are respectively connected with two ends of the radiating pipe, and the supercharging mechanism is arranged at the joint of the heat absorption pipe and the radiating pipe;
heat conducting media are filled in the heat absorption pipe and the radiating pipe;
the heat absorption pipe is arranged between the grating layers, and the radiating pipe is arranged at a flue gas inlet of the SCR reactor.
The heat conducting medium is heat conducting oil or heat conducting gas.
The supercharging mechanism comprises a first acceleration pump and a second acceleration pump;
and two ends of the heat absorption pipe are respectively connected with two ends of the radiating pipe through a first accelerating pump and a second accelerating pump.
Along with the flowing direction of the heat-conducting medium, the pipe diameter of the heat-absorbing pipe gradually increases, and the pipe diameter ratio of the pipe diameter of the starting end of the heat-absorbing pipe to the pipe diameter of the tail end of the heat-absorbing pipe is 0.3-0.6, preferably 0.5.
Along with the flowing direction of the heat-conducting medium, the pipe diameters of the radiating pipes are gradually reduced, and the ratio of the pipe diameter of the tail end of the radiating pipe to the pipe diameter of the starting end of the radiating pipe is 0.3-0.6, preferably 0.5.
Fins are arranged on the outer sides of the heat absorption pipe and the radiating pipe.
The invention also comprises a heat absorption pipe fixing plate which is inserted into the gap of the grid layer and is provided with a mounting hole for the hot water pipe to pass through; the heat absorption tube is fixedly arranged on the heat absorption tube fixing plate.
The distance between the heat absorbing pipes is 0.2-0.4 of the total length of the air guide grid, and preferably 0.25. The air guide grids are arranged side by side, and the hot water pipe circularly and reciprocally penetrates through the air guide grids.
Compared with the prior art, the invention provides the economizer for improving the denitration capability of the SCR system during low-load operation, the heat at the economizer is transmitted into the SCR reactor through the heat conduction device, the temperature of reaction gas is improved, and the denitration capability of the SCR system is improved; the heat absorption pipe and the heat dissipation pipe with gradually changed pipe diameters are arranged, the change of expansion and contraction of a heat conduction medium is considered, when the heat conduction medium is heat conduction oil, the volume flow rate of the heat conduction oil can be ensured to be consistent, the uniformity of heat transfer is improved, and when the heat conduction medium is heat conduction gas, heat is transferred by utilizing the principle of compression heat release and expansion heat absorption of the heat conduction gas, so that the heat transfer efficiency is improved; fins are arranged on the outer sides of the heat conduction pipe and the radiating pipe, so that the heat conduction effect can be improved; the invention also has excellent flexibility, can be used for different smoke temperature setting conditions, and can adjust the heat conduction effect by adjusting the setting number and the distance distribution of the heat absorption ends on the air guide grid, so that the invention has wider application range.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic structural view of a heat conducting device according to the present invention;
in the figure, 1 is a base, 2 is a hot water pipe, 3 is an air guide grid, 4 is a water outlet, 5 is a water inlet, 6 is a heat absorption end, 7 is a first acceleration pump, 8 is a second acceleration pump, 9 is a heat dissipation end, 10 is a heat dissipation pipe, and 11 is a heat absorption pipe.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that variations and modifications can be made by persons skilled in the art without departing from the spirit of the invention. All falling within the scope of the present invention.
Example 1
The economizer for improving the denitration capability of the SCR system during low-load operation comprises an air guide grid 3 and a heat conduction device, wherein the air guide grid 3 is formed by sequentially arranging a plurality of grid layers, an installation hole is formed in the air guide grid 3, and a hot water pipe 2 penetrates through the installation hole to be matched and connected with the air guide grid 3; the water outlet 4 of the hot water pipe 2 is connected with the inlet of a water delivery pump, and the water inlet 5 of the hot water pipe 2 is connected with the water outlet of the water delivery pump; the air guide grids 3 are arranged side by side, four rows are arranged in the horizontal direction, and four rows are also arranged in the vertical direction; the hot water pipe 2 is circulated back and forth through the air guide grill 3.
The heat conduction device is divided into a heat absorption end 6 and a heat dissipation end 9, and the specific structure comprises a heat absorption pipe 11, a heat dissipation pipe 10 and a pressurization mechanism which are communicated with each other, wherein the heat absorption pipe 11 is arranged between grid layers, and the distance between the heat absorption pipes 11 is 0.25 of the total length of the air guide grid 3; the radiating pipe 10 is arranged at the smoke inlet of the SCR reactor; heat conducting medium heat conducting oil is filled in the heat absorbing pipe 11 and the radiating pipe 10, the heat conducting oil circularly and repeatedly flows in the heat absorbing pipe 11 and the radiating pipe 10, heat of smoke at the coal economizer is conveyed into the SCR reactor, and the temperature of inlet materials of the reactor is increased.
The concrete connection mode is as follows: the end of the heat absorbing pipe 11 is connected with the starting end of the radiating pipe 10 through the first accelerating pump 7, the starting end of the heat absorbing pipe 11 is connected with the end of the radiating pipe 10 through the second accelerating pump 8, the movement process of the heat conducting oil is that the heat conducting oil flows from the starting end of the heat absorbing pipe 11 to the end of the heat absorbing pipe 11, the heat conducting oil is pressurized through the second accelerating pump 8 and then flows into the starting end of the radiating pipe 10 and then flows into the end of the radiating pipe 10, and the heat conducting oil flows into the starting end of the heat absorbing pipe 11 after being pressurized through the first accelerating pump 7 to form a circulation.
Considering that the heat conduction oil expands with heat and contracts with cold to cause the change of the flow velocity of the heat conduction oil in the heat conduction device, the volume of the heat conduction oil at the end with lower temperature is smaller, the pipe diameter is set to be small, the flow velocity of the heat conduction oil in the whole device can be kept consistent, the heat exchange is more uniform, and the effect is higher; therefore, the radiating pipe 10 with a gradually decreasing diameter from the beginning to the end is arranged in the radiating end 9 in the present embodiment; the heat absorption end 6 is internally provided with a heat absorption pipe 11 with the diameter gradually increasing from the starting end to the tail end; wherein, the ratio of the pipe diameter of the starting end of the heat absorbing pipe 11 to the pipe diameter of the tail end is 1: 2; the ratio of the pipe diameter of the tail end of the radiating pipe to the pipe diameter of the starting end is 1: 2.
in order to further enhance the heat exchange effect, fins are provided on the outer sides of the heat absorbing pipe 11 and the radiating pipe 10.
In order to facilitate the installation of the heat absorption pipes 11, the heat absorption pipe fixing plate is provided in the embodiment, the heat absorption pipe 11 fixing plate is inserted into the gap of the grid layer, and the heat absorption pipe fixing plate is provided with installation holes for the hot water pipes 2 to pass through; the heat absorption tube 11 is fixedly arranged on the heat absorption tube fixing plate.
Example 2
The economizer for improving the denitration capability of the SCR system during low-load operation comprises an air guide grid 3 and a heat conduction device, wherein the air guide grid 3 is formed by sequentially arranging a plurality of grid layers, an installation hole is formed in the air guide grid 3, and a hot water pipe 2 penetrates through the installation hole to be matched and connected with the air guide grid 3; the water outlet 4 of the hot water pipe 2 is connected with the inlet of a water delivery pump, and the water inlet 5 of the hot water pipe 2 is connected with the water outlet of the water delivery pump; the air guide grids 3 are arranged side by side, four rows are arranged in the horizontal direction, and four rows are also arranged in the vertical direction; the hot water pipe 2 is circulated back and forth through the air guide grill 3.
The heat conduction device is divided into a heat absorption end 6 and a heat dissipation end 9, and the specific structure comprises a heat absorption pipe 11, a heat dissipation pipe 10 and a pressurization mechanism which are communicated with each other, wherein the heat absorption pipe 11 is arranged between grid layers, and the distance between the heat absorption pipes 11 is 0.4 of the total length of the air guide grid 3; the radiating pipe 10 is arranged at the smoke inlet of the SCR reactor; the heat-conducting medium heat-conducting gas is filled in the heat-absorbing pipe 11 and the radiating pipe 10, and the heat-conducting gas circularly and repeatedly flows in the heat-absorbing pipe 11 and the radiating pipe 10 to convey the heat of the flue gas at the economizer into the SCR reactor, so that the temperature of the inlet material of the reactor is increased.
The concrete connection mode is as follows: the end of the heat absorbing pipe 11 is connected with the starting end of the radiating pipe 10 through the first accelerating pump 7, the starting end of the heat absorbing pipe 11 is connected with the end of the radiating pipe 10 through the second accelerating pump 8, the movement process of the heat conducting oil is that the heat conducting oil flows from the starting end of the heat absorbing pipe 11 to the end of the heat absorbing pipe 11, the heat conducting oil is pressurized through the second accelerating pump 8 and then flows into the starting end of the radiating pipe 10 and then flows into the end of the radiating pipe 10, and the heat conducting oil flows into the starting end of the heat absorbing pipe 11 after being pressurized through the first accelerating pump 7 to form a circulation.
The heat expansion and cold contraction phenomena of the heat-conducting gas are more obvious, the device transfers heat by utilizing the principle of compression heat release and expansion heat absorption of the heat-conducting gas, and the pipe diameter of the tail end of the radiating pipe is set to be a small pipe diameter, so that the heat-conducting gas is favorably compressed, the temperature of the heat-conducting gas is increased, and the heat release is more favorably realized at the radiating end; the tail end of the heat absorption pipe is set to be large in pipe diameter, so that the volume of the heat conduction gas is increased, the temperature is reduced, and heat absorption at the heat absorption end is facilitated. The device with gradually changed tube diameters is beneficial to keeping the heat transfer temperature difference consistent and improving the heat exchange efficiency. Wherein, the ratio of the pipe diameter of the starting end of the heat absorption pipe 11 to the pipe diameter of the tail end of the heat absorption pipe is 0.3; the ratio of the pipe diameter of the tail end of the radiating pipe to the pipe diameter of the starting end is 0.3.
In order to further enhance the heat exchange effect, fins are provided on the outer sides of the heat absorbing pipe 11 and the radiating pipe 10.
In order to facilitate the installation of the heat absorption pipes 11, the heat absorption pipe fixing plate is provided in the embodiment, the heat absorption pipe 11 fixing plate is inserted into the gap of the grid layer, and the heat absorption pipe fixing plate is provided with installation holes for the hot water pipes 2 to pass through; the heat absorption tube 11 is fixedly arranged on the heat absorption tube fixing plate.
Example 3
The economizer for improving the denitration capability of the SCR system during low-load operation comprises an air guide grid 3 and a heat conduction device, wherein the air guide grid 3 is formed by sequentially arranging a plurality of grid layers, an installation hole is formed in the air guide grid 3, and a hot water pipe 2 penetrates through the installation hole to be matched and connected with the air guide grid 3; the water outlet 4 of the hot water pipe 2 is connected with the inlet of a water delivery pump, and the water inlet 5 of the hot water pipe 2 is connected with the water outlet of the water delivery pump; the air guide grids 3 are arranged side by side, four rows are arranged in the horizontal direction, and four rows are also arranged in the vertical direction; the hot water pipe 2 is circulated back and forth through the air guide grill 3.
The heat conduction device is divided into a heat absorption end 6 and a heat dissipation end 9, and the specific structure comprises a heat absorption pipe 11, a heat dissipation pipe 10 and a pressurization mechanism which are communicated with each other, wherein the heat absorption pipe 11 is arranged between grid layers, and the distance between the heat absorption pipes 11 is 0.2 of the total length of the air guide grid 3; the radiating pipe 10 is arranged at the smoke inlet of the SCR reactor; the heat-conducting medium heat-conducting gas is filled in the heat-absorbing pipe 11 and the radiating pipe 10, and the heat-conducting gas circularly and repeatedly flows in the heat-absorbing pipe 11 and the radiating pipe 10 to convey the heat of the flue gas at the economizer into the SCR reactor, so that the temperature of the inlet material of the reactor is increased.
The concrete connection mode is as follows: the end of the heat absorbing pipe 11 is connected with the starting end of the radiating pipe 10 through the first accelerating pump 7, the starting end of the heat absorbing pipe 11 is connected with the end of the radiating pipe 10 through the second accelerating pump 8, the movement process of the heat conducting oil is that the heat conducting oil flows from the starting end of the heat absorbing pipe 11 to the end of the heat absorbing pipe 11, the heat conducting oil is pressurized through the second accelerating pump 8 and then flows into the starting end of the radiating pipe 10 and then flows into the end of the radiating pipe 10, and the heat conducting oil flows into the starting end of the heat absorbing pipe 11 after being pressurized through the first accelerating pump 7 to form a circulation.
The heat expansion and cold contraction phenomena of the heat-conducting gas are more obvious, the device transfers heat by utilizing the principle of compression heat release and expansion heat absorption of the heat-conducting gas, and the pipe diameter of the tail end of the radiating pipe is set to be a small pipe diameter, so that the heat-conducting gas is favorably compressed, the temperature of the heat-conducting gas is increased, and the heat release is more favorably realized at the radiating end; the tail end of the heat absorption pipe is set to be large in pipe diameter, so that the volume of the heat conduction gas is increased, the temperature is reduced, and heat absorption at the heat absorption end is facilitated. The device with gradually changed tube diameters is beneficial to keeping the heat transfer temperature difference consistent and improving the heat exchange efficiency. Wherein, the ratio of the pipe diameter of the starting end of the heat absorption pipe 11 to the pipe diameter of the tail end of the heat absorption pipe is 0.6; the ratio of the pipe diameter of the tail end of the radiating pipe to the pipe diameter of the starting end is 0.6.
In order to further enhance the heat exchange effect, fins are provided on the outer sides of the heat absorbing pipe 11 and the radiating pipe 10.
In order to facilitate the installation of the heat absorption pipes 11, the heat absorption pipe fixing plate is provided in the embodiment, the heat absorption pipe 11 fixing plate is inserted into the gap of the grid layer, and the heat absorption pipe fixing plate is provided with installation holes for the hot water pipes 2 to pass through; the heat absorption tube 11 is fixedly arranged on the heat absorption tube fixing plate.
The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes and modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention.

Claims (7)

1. The economizer for improving the denitration capability of the SCR system during low-load operation comprises an air guide grid (3), wherein the air guide grid (3) is formed by sequentially arranging a plurality of grid layers, an installation hole is formed in the air guide grid (3), and a hot water pipe (2) penetrates through the installation hole to be connected with the air guide grid (3) in a matched manner; it is characterized by also comprising a heat conducting device;
the heat conduction device comprises a heat absorption pipe (11), a radiating pipe (10) and a pressurizing mechanism, wherein two ends of the heat absorption pipe (11) are respectively connected with two ends of the radiating pipe (10), and the pressurizing mechanism is arranged at the joint of the heat absorption pipe (11) and the radiating pipe (10);
heat conducting media are filled in the heat absorbing pipe (11) and the radiating pipe (10);
the heat absorption pipes (11) are arranged between the grating layers, and the radiating pipes (10) are arranged at the flue gas inlet of the SCR reactor;
along the flowing direction of the heat-conducting medium, the pipe diameter of the heat-absorbing pipe (11) is gradually increased, and the ratio of the pipe diameter of the starting end of the heat-absorbing pipe to the pipe diameter of the tail end of the heat-absorbing pipe is 0.3-0.6;
along the flowing direction of the heat-conducting medium, the pipe diameters of the radiating pipes (10) are gradually reduced, and the ratio of the pipe diameter of the tail ends of the radiating pipes to the pipe diameter of the starting ends of the radiating pipes is 0.3-0.6;
the heat conducting medium is heat conducting oil or heat conducting gas, and when the heat conducting medium is heat conducting oil, the heat absorbing pipe (11) and the radiating pipe (10) are used for enabling the volume flow rate of the heat conducting oil to be consistent, and the uniformity of heat transfer is improved; when the heat-conducting medium is heat-conducting gas, the heat absorption pipe (11) and the heat dissipation pipe (10) transfer heat by utilizing the principles of compression heat release and expansion heat absorption of the heat-conducting gas, so that the heat transfer efficiency is improved;
the heat-absorbing pipe fixing plate is inserted into the gap of the grid layer, and the heat-absorbing pipe fixing plate is provided with a mounting hole for the hot water pipe (2) to pass through; the heat absorption pipe (11) is fixedly arranged on the heat absorption pipe fixing plate;
the supercharging mechanism comprises a first acceleration pump (7) and a second acceleration pump (8);
and two ends of the heat absorption pipe (11) are respectively connected with two ends of the radiating pipe (10) through a first accelerating pump (7) and a second accelerating pump (8).
2. The economizer for improving denitration capability during low-load operation of the SCR system as recited in claim 1, wherein the ratio of the pipe diameter of the beginning end of the heat absorbing pipe to the pipe diameter of the end of the heat absorbing pipe is 0.5.
3. The economizer for improving denitration capability during low-load operation of the SCR system as recited in claim 1, wherein the ratio of the pipe diameter of the end of the heat dissipation pipe to the pipe diameter of the starting end is 0.5.
4. The economizer for improving denitration capability of SCR system in low load operation as claimed in claim 1, wherein fins are provided on the outer sides of the heat absorbing pipe (11) and the heat radiating pipe (10).
5. The economizer for improving denitration capability in low-load operation of SCR system according to claim 1, wherein the distance between the heat absorbing pipes (11) is 0.2-0.4 of the total length of the air guide grid (3).
6. The economizer for improving denitration capability in SCR system in low load operation as claimed in claim 5, wherein the spacing of said heat absorbing pipes (11) is 0.25 of the total length of said air guide grid (3).
7. The economizer for improving denitration capability of SCR system in low load operation according to claim 1, wherein the air guide grids (3) are arranged side by side, and the hot water pipe (2) passes through the air guide grids (3) in a circulating and reciprocating manner.
CN201811556769.6A 2018-12-19 2018-12-19 Improve economizer of SCR system low-load operation denitration ability Active CN109611819B (en)

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CN106440895A (en) * 2016-10-10 2017-02-22 华北电力大学（保定） Method for increasing SCR inlet smoke temperature based on heat pipe

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