CN210108105U

CN210108105U - Bulk heat accumulating type heat exchanger

Info

Publication number: CN210108105U
Application number: CN201920335417.1U
Authority: CN
Inventors: 魏小青; 郭兰英; 张伟; 张树新
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-03-10
Filing date: 2019-03-10
Publication date: 2020-02-21
Anticipated expiration: 2029-03-10

Abstract

The utility model provides a bulk heat accumulating type heat exchanger, which is invented for solving the problem of blockage of a heat exchanger in an SCR denitration system. The method is characterized in that: the flue gas main pipe of the high-temperature flue gas SCR reactor is connected with a heat exchange split body through a branch pipe, a heat storage chamber of the heat exchange split body is a rectangular charging barrel with two side walls in a grate type, a scattered heat storage material is arranged in the charging barrel, and a cold end channel and a hot end channel are arranged on two sides of the charging barrel; the high-temperature flue gas branch pipe is connected to the upper part of the hot end channel and is connected with the high-temperature air main pipe; the cold end flue gas branch pipe is connected with the low temperature flue gas main pipe and is connected with the low temperature air main pipe. Compared with the prior art, the utility model discloses can not make the resistance increase of heat accumulator, can not cause the influence to the boiler operation, can not increase the fan consumption, can not cause the unplanned shut down, also need not wash heat transfer component. And simple structure, easy implementation, convenient operation, do benefit to the maintenance, can extensively be used for SCR deNOx systems.

Description

Bulk heat accumulating type heat exchanger

Technical Field

The utility model belongs to the technical field of SCR deNOx systems equipment, especially, relate to a heat accumulation formula heat exchanger.

Background

With the promulgation of the NOx emission standard, namely the emission standard of atmospheric pollutants for thermal power plants (GB 13223-. In denitration improvement of thermal power plants in recent years, the SCR technology accounts for more than 95%. However, in specific applications, there are a series of technical problems as follows: firstly, the SCR denitration system can generate Ammonium Bisulfate (ABS) in the smoke environment of a thermal power plant, and the Ammonium Bisulfate (ABS) is a high-viscosity liquid substance and is easy to adhere and deposit in the temperature range of 150-220 ℃; and the temperature interval is just overlapped with the temperature interval of the heat exchange element in the air heat accumulator, so that the adhesion of Ammonium Bisulfate (ABS) on the surface of the heat exchange element of the heat accumulator is difficult to avoid, and further the adhesion and the deposition of fly ash particles in the flue gas are realized. Secondly, because the rotary air heat accumulator is mostly adopted in the SCR denitration system at present, and the heat exchange elements of the rotary air heat accumulator are heat exchange channels formed by heat exchange sheets according to a certain sequence, when the rotary air heat accumulator encounters the adhesion and deposition of Ammonium Bisulfate (ABS), the blockage of the heat exchange element channels is inevitably caused, so that the resistance of the air heat accumulator is increased. Thirdly, as the resistance of the air heat accumulator is increased, the heat transfer effect of the heat accumulator is inevitably reduced, the air leakage rate is increased, and the boiler efficiency is reduced due to the increase of the exhaust gas temperature of the boiler; the pressure difference at two ends of the heat exchanger is increased and the flow rate of flue gas is changed, so that the catalyst is washed unevenly, and even the catalyst collapses in a large area in a serious case; the method also causes a series of losses such as increase of fan power consumption, reduction of unit load carrying capacity, increase of unplanned shutdown and the like. Fourthly, some enterprises adopt a method of washing the heat exchange elements off-line or on-line by high-pressure water at present by taking measures for solving the series of problems, but the method is higher in cleaning cost. Such as a flushing device of an enterprise: the water consumption reaches 13 tons/hour, the power consumption reaches 135 kilowatts/hour, and one stroke of each air heat accumulator needs to be cleaned for 4 hours. And the complete high-pressure water cleaning device such as a cleaning control device, a high-pressure water pump, a water pump control cabinet and the like is required for completing online cleaning, so that the enterprise burden is obviously increased.

Disclosure of Invention

The utility model aims at: to the above-mentioned problem among the prior art, from improving heat exchanger heat transfer mode down, provide a bulk cargo heat accumulation formula heat exchanger. This bulk cargo heat accumulation formula heat exchanger can effectively solve the jam problem of heat exchanger in SCR deNOx systems, not only can eliminate prior art's defect, but also has simple structure, convenient operation, practices thrift the fund, reduces a great deal of advantages such as consumptive material.

The technical solution of the utility model is that: the utility model provides a bulk cargo heat accumulation formula heat exchanger, includes high temperature flue gas SCR reactor, characterized by: the flue gas main pipe of the high-temperature flue gas SCR reactor is connected with a heat exchange split body through a high-temperature flue gas branch pipe and a valve, and the heat exchange split body comprises a regenerator; the heat accumulation chamber is a rectangular charging barrel with two side walls in a grate type, a scattered heat accumulation material is arranged in the charging barrel, a feeding hole and a sealing cover are arranged at the upper part of the charging barrel, a discharging hole and a sealing cover are arranged at the lower part of the charging barrel, and a cold end channel and a hot end channel are arranged at two sides of the charging barrel; the high-temperature flue gas branch pipe and the valve are connected to the upper part of the hot end channel, and the upper part of the hot end channel is also provided with a high-temperature air branch pipe and a high-temperature air main pipe which are connected with each other; the lower part of the cold end channel is provided with a cold end flue gas branch pipe and a valve which are connected with a low temperature flue gas main pipe, and the lower part of the cold end channel is also provided with a low temperature air branch pipe and a valve which are connected with the low temperature air main pipe.

The particle size of the bulk heat storage material is 5-200 mm. Typically pellets or stones. The number of the heat exchange split bodies is generally not less than three.

Compared with the prior art, the utility model discloses unique heat transfer mode has: namely, each heat exchange split realizes the heat exchange process of a single heat exchange split through three links of heat storage, heat supply and waiting: the heat storage link is that high-temperature flue gas flows through a heat storage chamber to heat storage bulk materials; the heat supply link is that low-temperature air flows through the heat storage chamber and is heated by the heat storage bulk material; the waiting link is in the intermission period between the two and also in the period of replacing the heat accumulation bulk cargo. The heat exchanger is continuously operated by the alternative operation of a plurality of heat exchange split bodies in the unique heat exchange mode.

The utility model discloses outstanding advantage: is the design of the bulk heat storage material, namely the innovation of the heat exchange mode of the bulk material. The regenerators of the prior art are of the rotary motion type, while the regenerators of the present invention are of the vented stationary type. The static bulk material regenerator not only has the same heat storage and heat exchange functions as the heat exchange element of the rotary air heat accumulator, but also has the replaceable flexibility which is not possessed by the heat exchange element of the rotary air heat accumulator. That is, the heat exchange element of the rotary air heat accumulator in the prior art cannot be replaced at will, but needs to be stopped for cleaning; the heat exchange element of the bulk heat accumulating type heat exchanger, namely the bulk material, can be replaced at will without stopping the machine for cleaning.

The utility model discloses a another outstanding advantage: the material is reusable and cheap. If the pellets are used in the bulk material, the replaced pellets still do not lose the original performance and can be used as usual, for example, for smelting and the like; if stones are used, they are certainly inexpensive. Needless to say, not only is the bulk material itself easily accepted here, but also the bulk material is very convenient to replace.

So seem, though the utility model provides a heat exchanger can not change: because of the reality of SCR deNOx systems produced into Ammonium Bisulfate (ABS) under thermal power plant's flue gas environment, also can not change ammonium bisulfate's adhesion and sedimentary nature, but it can eliminate prior art's drawback through the operation of change bulk cargo in good time for the heat exchanger no longer infringes by Ammonium Bisulfate (ABS), so, all defects that Ammonium Bisulfate (ABS) brought for prior art the utility model discloses an in the application just the system can be eliminated.

Therefore, the utility model discloses neither can make the resistance increase of heat accumulator, also can not cause the influence to the boiler operation, also can not increase the fan consumption, more can not cause the unplanned shut down. Of course, flushing of the heat exchange element is even less necessary. Obviously, adopt the utility model discloses the technique can be saved prior art and capital, material and the equipment that consumes in maintaining heat exchanger normal course of operation.

Furthermore, the utility model discloses still have simple structure, implement easily, convenient operation, do benefit to a great deal of advantages such as maintenance.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

The figures are labeled as follows: the system comprises a high-temperature flue gas SCR reactor inlet 1, an SCR reactor 2, a high-temperature flue gas main pipe 3, high-temperature flue gas branch pipes and valves 4, high-temperature air branch pipes and valves 5, a hot end channel 6, a regenerator feed inlet and a sealing cover 7, a cold end channel 8, a regenerator 9, a bulk heat storage material 10, cold end flue gas branch pipes and valves 11, a regenerator discharge outlet and a sealing cover 12, low-temperature air branch pipes and valves 14, a low-temperature flue gas main pipe 15, a low-temperature air main pipe 16 and a high-temperature air main pipe 17.

Detailed Description

The present invention will be described in detail with reference to the accompanying drawings.

As shown in the figure, the utility model provides a pair of bulk cargo heat accumulation formula heat exchanger, including high temperature flue gas SCR reactor 2, characterized by: the flue gas main pipe 3 of the high-temperature flue gas SCR reactor 2 is connected with a heat exchange split body through a high-temperature flue gas branch pipe and a valve 4, and the heat exchange split body comprises a regenerator 9; the heat accumulation chamber 9 is a rectangular charging barrel with two side walls in a grate type, a scattered heat accumulation material 10 is arranged in the charging barrel, a feeding hole and a sealing cover 7 are arranged at the upper part of the charging barrel, a discharging hole and a sealing cover 12 are arranged at the lower part of the charging barrel, and a cold end channel 8 and a hot end channel 6 are arranged at two sides of the charging barrel; the high-temperature flue gas branch pipe and the valve 4 are connected to the upper part of the hot end channel 6, and the upper part of the hot end channel 6 is also provided with a high-temperature air branch pipe and a valve 5 which are connected with a high-temperature air main pipe 17; the lower part of the cold end channel 8 is provided with a cold end flue gas branch pipe and a valve 11 which are connected with a low temperature flue gas main pipe 15, and the lower part of the cold end channel 8 is also provided with a low temperature air branch pipe and a valve 14 which are connected with a low temperature air main pipe 16. The particle size of the bulk thermal storage material 10 is 5 to 200mm, and pellets or stones may be used. And the number of the heat exchange split bodies is three.

In the implementation, the number of the heat exchange split bodies can be more than 3 according to the needs. Each heat exchange split body realizes continuous supply of stable heat to a required medium by alternately executing heat storage operation, heat supply operation and a waiting state. When the system needs to replace the heat storage bulk materials, the heat exchange split type inlet and outlet valves are closed, and then the discharging and the reloading can be carried out through the sequential operation of the inlet and the outlet.

One specific embodiment is described below:

the amount of flue gas generated by a power plant boiler is 360000m³And h, adopting high ash content arrangement, and installing the heat exchanger in the SCR reactor 2 to ensure that the temperature of gas in the flue gas main pipe 3 is 300 ℃. Through thermal calculation, the heat exchanger adopts 3 groups of heat exchange split bodies, the heat storage bulk material 10 adopts pellets with the diameter of 16mm, and the cross-sectional area of each group of heat exchange split heat storage chambers 10 is 100m²The ball loading is 300m³And a two-stage and two-supply heat exchange system is adopted, so that the air with the same flow can be heated from 120 ℃ to 300 ℃.

The utility model discloses can extensively be used for SCR deNOx systems.

Claims

1. The utility model provides a bulk cargo heat accumulation formula heat exchanger, includes high temperature flue gas SCR reactor, characterized by: a flue gas main pipe (3) of the high-temperature flue gas SCR reactor (2) is connected with a heat exchange split body through a high-temperature flue gas branch pipe and a valve (4), and the heat exchange split body comprises a regenerator (9); the heat accumulation chamber (9) is a rectangular charging barrel with two side walls in a grate type, a scattered heat accumulation material (10) is arranged in the charging barrel, a feeding hole and a sealing cover (7) are arranged at the upper part of the charging barrel, a discharging hole and a sealing cover (12) are arranged at the lower part of the charging barrel, and a cold end channel (8) and a hot end channel (6) are arranged at two sides of the charging barrel; the high-temperature flue gas branch pipe and the valve (4) are connected to the upper part of the hot end channel (6), and the upper part of the hot end channel (6) is provided with a high-temperature air branch pipe and a valve (5) which are connected with a high-temperature air main pipe (17); the lower part of the cold end channel (8) is provided with a cold end flue gas branch pipe and a valve (11) which are connected with a low temperature flue gas main pipe (15), and the lower part of the cold end channel (8) is provided with a low temperature air branch pipe and a valve (14) which are connected with a low temperature air main pipe (16).

2. The bulk regenerative heat exchanger of claim 1, further comprising: the particle size of the bulk heat storage material (10) is 5-200 mm.

3. The bulk regenerative heat exchanger of claim 2, further comprising: the bulk heat-storage material is pellet or stone.

4. A bulk regenerative heat exchanger as set forth in claim 1, 2 or 3, characterized in that: the number of the heat exchange split bodies is not less than three.