CN211717257U

CN211717257U - Cold and hot double-channel online ash removal type GGH heat exchanger

Info

Publication number: CN211717257U
Application number: CN201922177067.3U
Authority: CN
Inventors: 张锦涛; 钱荣忠; 李宁; 莫立勤
Original assignee: Nanjing Yire Vertical Environmental Protection Technology Liyang Co ltd
Current assignee: Nanjing Yire Vertical Environmental Protection Technology Liyang Co ltd
Priority date: 2019-12-06
Filing date: 2019-12-06
Publication date: 2020-10-20
Anticipated expiration: 2029-12-06

Abstract

The utility model discloses an online deashing formula GGH heat exchanger of cold and hot double-flow passage mainly by the casing, cold side gas inlet flange, cold side gas outlet flange, hot side gas inlet flange, hot side gas outlet flange, cold side gas passage, hot side gas passage upper strata spray the pipe network, hot side gas passage lower floor sprays the pipe network, cold side gas passage upper strata spray the pipe network, cold side gas passage lower floor sprays the pipe network, overhaul the manhole, heat exchange assemblies, the leakage fluid dram constitutes. The heat exchange assembly consists of corrugated molded heat exchange fins and special support pieces. The utility model discloses well cold side sprays the vertical setting of pipe network, and the hot side sprays the pipe network level setting, and two sets of heat exchange assemblies about the two-stage setting is washed respectively, and every layer of pipe network divides two modules, corresponds different flanges, has realized the incessant washing in grades of heat exchanger.

Description

Cold and hot double-channel online ash removal type GGH heat exchanger

Technical Field

The utility model belongs to SOx/NOx control waste heat from flue gas technique, concretely relates to plate heat exchanger's washing especially relates to a cold and hot double-flow-passage online deashing formula GGH heat exchanger.

Background

The GGH is called a flue gas-flue gas heat exchanger, and is mainly a main device in a flue gas desulfurization system, and mainly recovers heat energy of original flue gas before desulfurization, exchanges heat with clean flue gas after desulfurization to raise the temperature of flue gas, so that on one hand, the temperature of the flue gas reaches above a dew point, the corrosion to a flue is reduced, and simultaneously, the unsaturation degree of the flue gas is improved, so that the condensation amount is reduced in the process of flue gas emission and diffusion, and white smoke is eliminated.

The GGH mainly comprises two types at present, one type is a plate heat exchanger, and the GGH has the advantages of compact equipment, light weight, lower cost and high coefficient of a heat transfer membrane, but the equipment is easy to block due to various turbulent flow structures for enhancing heat transfer, and if a turbulent flow enhanced heat transfer device is removed and a flat plate is adopted, the equipment scaling and blocking conditions can be relieved, but the heat transfer efficiency is greatly reduced; the other is a tubular heat exchanger which mainly adopts a light tube type and is not easy to accumulate dust, but the tubular GGH heat exchanger is difficult to be widely used because the heat transfer tube has thicker tube wall and higher cost and is usually limited to cost factors in practical engineering cases.

On the other hand, in domestic thermal power plants and steel plants, wet flue gas desulfurization systems such as a limestone-gypsum or ammonia process, an alkaline process and the like adopt GGH heat exchangers in large quantity at present, but in practical application, the phenomenon of scaling and blockage of GGH at different degrees is caused by various factors such as slurry carried by purified flue gas after desulfurization, overhigh content of original flue gas dust, unreasonable design and the like. Once the blockage occurs, the system resistance is increased if the blockage occurs, and in order to overcome the resistance, the pressure head of the booster fan must be increased, so that the operation cost of the system is greatly increased; if the blockage is serious, the system can not run directly, and the equipment is stopped to cause serious loss. Therefore, the GGH scaling and blocking phenomenon becomes a main factor influencing the safe and stable operation of the wet flue gas desulfurization system. In addition, the flue gas desulfurization system is limited to environmental protection pressure, and is often required to operate uninterruptedly, and is not practical if frequent manual ash removal is performed.

SUMMERY OF THE UTILITY MODEL

Utility model purpose: for the jam problem of two runners of former flue gas and clean flue gas that exist among the GGH of solving above-mentioned technique, the utility model provides a cold and hot double-runner online deashing formula GGH heat exchanger.

The technical scheme is as follows: the utility model provides an online deashing formula GGH heat exchanger of cold and hot double-flow passage, includes that casing, flange, cold side flue gas passageway, hot side spray the pipe network, the cold side sprays pipe network, access hole, heat transfer module and leakage fluid dram the cold side flue gas passageway, set up the hot side respectively with the heat transfer module clearance that hot side flue gas passageway corresponds and spray pipe network and cold side spray the pipe network, the hot side spray the pipe network and all have trunk line and a plurality of branch pipes to constitute, install the water inlet on the casing through flange, at hot side mould pressing heat transfer board and cold side mould pressing heat transfer board of heat transfer unit all be equipped with the shower, spray water top-down inside the washing stream channel slab, discharge the heat exchanger by.

Furthermore, a water inlet is arranged on the shell and is respectively connected with the main pipelines of the hot side spraying pipe network and the cold side spraying pipe network through connecting flanges.

The hot side spray pipe network include that hot side flue gas upper strata sprays pipe network and hot side flue gas lower floor spray the pipe network, by hot side spray water import flange, hot side trunk line and a plurality of hot side branch pipes, constitute, inside hot side branch pipe extends to every heat transfer unit space, and places space upper portion space in, hot side branch pipe is equipped with the aperture, the aperture is used for spraying, inside spray water top-down washed hot side crossing channel slab.

The hot side spray pipe network level set up, hot side flue gas upper strata spray pipe network and hot side flue gas lower floor spray the pipe network and equally divide into two modules, connect through the flange connection of difference and realize independent spraying control.

The hot side flue gas upper spraying pipe network is connected with a hot side flue gas third flange through a hot side flue gas first flange, and the hot side flue gas upper spraying pipe network is connected with a hot side flue gas fourth flange through a hot side flue gas second flange.

Further, the cold side sprays the pipe network and includes that the cold side flue gas upper strata sprays the pipe network and the cold side flue gas lower floor sprays the pipe network, and the cold side flue gas upper strata sprays the pipe network and is controlled the water inlet by cold side spray water inlet flange, is responsible for and the cold branch pipe of side including the cold side, installs the shower nozzle on the cold branch pipe of side.

The cold side spray the vertical setting of pipe network, the cold side flue gas upper strata sprays the pipe network and the cold side flue gas lower floor sprays the pipe network and falls into two modules, connects through the flange connection realization independence and sprays control of difference.

The cold side flue gas upper spray pipe network connect cold side flue gas import first flange and cold side flue gas import third flange, cold side flue gas lower floor sprays the pipe network and correspondingly connects cold side flue gas export second flange and cold side flue gas export fourth flange.

Furthermore, the plate structure of the mould pressing heat exchange module is divided into an upper stage and a lower stage, and a maintenance hole is formed in the position of an inlet top pipeline.

The heat exchange assembly consists of corrugated mould pressing heat exchange sheets and a support piece, and the upper side and the lower side of each adjacent mould pressing heat exchange sheet are pressed inwards and folded and then welded to form a welding line, so that a heat exchange unit is formed.

Furthermore, a sealing ring is arranged at the joint of the flange and the main pipeline or the branch pipe.

Has the advantages that: compared with the prior art, the GGH heat exchanger provided by the utility model has superior ash removal performance, the high-pressure flushing water flow impact force is utilized to remove the scaling components of the heat exchange element, the full coverage in the flue gas channel is realized through the design of the spray washing pipe, and the dead angle of the dirt is thoroughly eliminated; and realize that online deashing combines together with artifical deashing, under the condition that the system does not shut down, can realize the deashing through short time online spraying, do not influence owner's technology normal operating. Finally, the utility model discloses equipment cost is low, adopts wide passageway plate heat exchanger form, is difficult for the deposition, and equipment is compact, and heat transfer efficiency is high.

Drawings

Fig. 1 is a front view of the internal structure of the GGH heat exchanger of the present invention;

FIG. 2 is a top view of the internal structure of the heat exchanger;

FIG. 3 is a side view showing the internal structure of the heat exchanger;

FIG. 4 is a schematic diagram of a hot side upper pipe network structure;

FIG. 5 is a schematic diagram of a cold side superstrate network structure.

Detailed Description

For the purpose of explaining the technical solution disclosed in the present invention in detail, the following description is further made with reference to the accompanying drawings and specific embodiments.

Example 1

The utility model discloses a cold and hot double-flow-passage online deashing formula GGH heat exchanger, what this heat exchanger adopted is that the manual work overhauls the mode that washs and online cleaning combined together, strengthens the deashing effect. For this embodiment, firstly, combine the structural design requirement of common plate heat exchanger and the application in the flue gas desulfurization actual production, to the utility model discloses with the same partial design summary of current plate heat exchanger as follows:

be formed with the gas inlet and the exhanst gas outlet at high temperature flue gas passageway both ends between the inside heat exchange core of the casing of heat exchanger and mould pressing heat transfer board and the heat transfer unit, this embodiment is equipped with hot side flue gas passageway and cold side flue gas passageway. The heat exchange unit is formed by welding die pressing heat exchange plates which are arranged in parallel, one end of the heat exchange unit is connected with a hot side flue gas inlet, the opposite direction of the heat exchange unit is connected with a hot side flue gas outlet, the other direction of the heat exchange unit is provided with an access hole, and two ends of a channel in the opposite direction are respectively connected with a cold side flue gas inlet and a cold side flue gas outlet. In addition, in the energy-saving transformation of hot dust-containing flue gas, a flue gas side is connected in parallel to increase a flue gas bypass pipeline, and a switching air valve is installed at the parallel connection position of a flue gas inlet. In this embodiment, the GGH heat exchanger is equipped with cold side inlet flue gas and cold side exhanst gas outlet, is equipped with the hot side and sprays pipe network, cold side spray pipe network and newly-increased access hole.

Cold and hot double-flow-passage online dust removal type GGH heat exchanger, as shown in fig. 1-fig. 3, mainly by casing 1, cold side gas inlet flange 201, cold side gas outlet flange 203, hot side gas inlet flange 301, hot side gas outlet flange 302, cold side gas channel 4, hot side gas channel 5, hot side gas upper layer spray pipe network 6, hot side gas lower layer sprays pipe network 7, cold side gas upper layer sprays pipe network 8, cold side gas lower layer sprays pipe network 9, access hole 10, heat exchange assembly 11, the leakage fluid dram constitutes 12 and constitutes. The heat exchange assembly 11 consists of corrugated, stamped heat exchanger fins and special supports. The upper and lower edges of two adjacent mould pressing heat exchange sheets are pressed inwards and folded and then welded to form a welding seam, so that a heat exchange unit is formed. The gas flow flows in the interspace formed in the middle thereof and is not described in detail in the prior art for plate heat exchangers.

As shown in fig. 4, the hot side spraying pipe network is divided into a hot side flue gas upper layer spraying pipe network 6 and a hot side flue gas lower layer spraying pipe network 7. The upper spraying pipe network 6 of the hot side flue gas corresponds to a first flange 301 and a third flange 303 of the hot side flue gas, the lower spraying pipe network 7 of the hot side flue gas corresponds to a second flange 302 and a fourth flange 304 of the hot side flue gas, when the device runs, the corresponding flange air channel can be opened and closed on line, and the normal heat exchange of the other channel can not be influenced when one channel is washed. The hot side flue gas upper spraying pipe network 6 is composed of a hot side spraying water inlet flange 601, a hot side main pipe 602 and a plurality of hot side fine branch pipes 603, each fine branch pipe extends into the space of each heat exchange unit and is arranged in the space at the upper part of the space, small holes are alternately formed in the hot side fine branch pipes 603 along a certain interval, spraying is convenient, and spraying water washes the interior of a hot side flow passage plate from top to bottom to prevent scaling. When the washing is carried out, the upper group or the lower group can be selected according to the running condition of the equipment, and the air channel of the corresponding module is closed. The normal operation of the equipment is not influenced.

As shown in fig. 5, the cold side spraying pipe network is also divided into an upper layer and a lower layer, which are respectively used for spraying the pipe network 8 on the upper layer of the cold side flue gas and the pipe network 9 on the lower layer of the cold side flue gas, and the upper layer and the lower layer respectively wash the upper part and the lower part of the heat exchange assemblies, so that the purpose of enhanced washing is achieved. Every layer divides two modules, and cold side flue gas upper strata sprays pipe network 8 and is imported by cold side shower water inlet flange 801 control, also divide into cold side and be responsible for 802 and the cold branch pipe 803 of side, and the high-efficient atomizer 804 of installation on the cold branch pipe of side for wash, two upper and lower two-stage sprays and constitute two module symmetric distributions, correspond the first flange 201 of connection cold side flue gas import, the third flange 203 of cold side flue gas import, the corresponding second flange 202 of cold side flue gas export of lower floor's module cold side, the fourth flange 204 of cold side flue gas export. When the equipment runs, the corresponding flange air duct can be opened and closed on line, and the normal heat exchange of the other module can not be influenced when one module is washed. The water washes the inside of the cold-side flow passage plate from top to bottom. According to the height of the equipment and the size of the flow section of the airflow, the number of the atomizing nozzles is reasonably configured on the premise of ensuring the coverage surface. When the washing device is used for washing, each module can be opened according to requirements, the air channel of the corresponding module is closed, normal operation of other modules is not influenced under the condition that the corresponding module is washed, and uninterrupted operation of the system is guaranteed to the maximum extent.

Example 2

The following combines the utility model discloses a concrete working process and the principle of heat exchanger come further this technical scheme of description, the operation of this GGH heat exchanger includes following process:

1. manual maintenance cleaning

1.1 Cold side clean flue gas fraction

In the gaps of the molded heat exchange sheets and the formed heat exchange units, a cold side spray pipe is divided into an upper stage and a lower stage, and an access hole 11 is formed in the top pipeline of an inlet to wash and repair a higher-stage heat exchange module; in addition, a manhole is arranged in the middle of the upper heat exchange plate assembly and the lower heat exchange plate assembly of the heat exchanger body, and the lower heat exchange module is cleaned manually to wash and overhaul.

1.2 Hot side raw flue gas portion

A manhole is arranged at the inlet and outlet pipeline parts of the hot side, and the hot side heat exchange module is manually washed and overhauled;

2. on-line cleaning of cold-side purified flue gas part

2.1 cold side online ash removal structure

The atomizer head arrangement is shown in fig. 5.

The cold side overflowing part adopts an atomizing spray head type online ash removal. The plate structure of the heat exchange module is divided into an upper stage and a lower stage, so that the atomization nozzle structure is divided into an upper stage and a lower stage, the nozzles are numbered from top to bottom in sequence, a higher stage nozzle pipe network sprays liquid from a first spraying port and a second spraying port, each spraying port corresponds to an area passage of 1/2, and the distance between the plates of the higher stage heat exchange module is 20 mm. Spraying liquid enters the lower-level spray head pipe network from a third spraying port to a sixth spraying port, each spraying port corresponds to an 1/4 flow area channel, the distance between upper module plates is 24mm, the flow of each spraying port on the cold side is required to be 90m3/h, and the water pressure is required to be 4-5 kg.

2.2 grading uninterrupted on-line cleaning mode

When the equipment is cleaned, the flow limit of the pump and the process operation requirement are considered, and a grading continuous online cleaning mode can be adopted.

Cleaning a higher-level spray head pipe network: and (3) opening a valve of the pipeline corresponding to the spraying port, wherein the port corresponds to the 1/2 flow area channel, cleaning for about 2-5min, wherein the cleaning time depends on the specific effect, after the part is finished, closing the valve of the pipeline corresponding to the spraying port, opening a valve of the pipeline corresponding to the second spraying port, and continuously cleaning.

The cleaning mode of the lower stage spray head pipe network is the same as that of the upper stage spray head pipe network, and the positions of the flow area channels corresponding to the 3 rd to 6 th spray ports are shown in figures 1 to 5.

2.3 description of liquid discharge

Spray liquid on the cold side (in the vertical direction) flows out of the heat exchanger from top to bottom and enters the pipeline, so a liquid outlet is not arranged.

3. On-line cleaning of hot side clean flue gas part

3.1 hot side online ash removal structure

The hot side overflows the online deashing of part adoption spray pipe internal insertion formula, equally according to heat transfer module structure, divides two-stage down to spray, down from left and right numbering in proper order to spraying the mouth, promptly, higher level's spray pipe is sprayed liquid by first and second spraying mouth and is advanced spraying liquid, and spray pipe is advanced spraying liquid by third and fourth spraying mouth to subordinate, and the inter-plate spacing is 16mm, and every spraying mouth flow of hot side all requires 60 square/h, water pressure 4 ~ 5 kilograms.

3.2 grading uninterrupted on-line cleaning mode

And opening the valve of the pipeline corresponding to the first spraying port, cleaning for about 2-5min, wherein the cleaning time depends on the specific effect, closing the valve of the pipeline corresponding to the first spraying port after the part is finished, opening the valve of the pipeline corresponding to the second spraying port, and continuously cleaning. The rest is the same as above.

3.3 description of liquid discharge

The hot survey inlet and outlet department all sets up the leakage fluid dram, and heat exchange module slightly inclines (10mm) to the export direction, and the wind channel groove export is high 50mm, is convenient for to the exit flowing back.

Claims

1. The utility model provides a cold and hot double-flow-passage online deashing formula GGH heat exchanger which characterized in that: including casing (1), flange, cold side flue gas passageway (4), hot side flue gas passageway (5), hot side spray the pipe network, the cold side sprays the pipe network, access hole (10), heat exchange assembly (11) and leakage fluid dram (12) cold side flue gas passageway (4) and heat exchange assembly (11) clearance that corresponds with hot side flue gas passageway (5) set up the hot side respectively and spray pipe network and cold side spray the pipe network, the hot side spray the pipe network and the cold side sprays the pipe network and all have trunk line and a plurality of branch pipes to form, install the water inlet on casing (1) through flange, hot side mould pressing heat transfer plate and cold side mould pressing heat transfer plate at heat transfer unit all are equipped with the shower, inside shower water top-down washed flow channel piece, discharged the heat exchanger by hot side leakage fluid dram.

2. The cold and hot double-channel online ash removal type GGH heat exchanger according to claim 1, characterized in that: the hot side spray pipe network include hot side flue gas upper strata spray pipe network (6) and hot side flue gas lower floor spray pipe network (7), by hot side spray water inlet flange (601), hot side trunk line (602) and a plurality of hot side branch pipes (603), constitute, inside hot side branch pipe (603) extended to every heat transfer unit space, and arranged space upper portion space in, hot side branch pipe (603) are equipped with the aperture, the aperture is used for spraying, and spray water top-down washes inside the hot side cross flow channel slab.

3. The cold and hot double-channel online ash removal type GGH heat exchanger according to claim 1, characterized in that: the cold side sprays the pipe network and includes that cold side flue gas upper strata spray pipe network (8) and cold side flue gas lower floor spray pipe network (9), and cold side flue gas upper strata spray pipe network (8) are by cold side shower water inlet flange (801) control water inlet, are responsible for (802) and side cold branch pipe (803) including the cold side, install shower nozzle (804) on side cold branch pipe (803).

4. The cold and hot double-channel online ash removal type GGH heat exchanger according to claim 1, characterized in that: the shell (1) is provided with a water inlet which is respectively connected with a main pipeline of the hot side spraying pipe network and the cold side spraying pipe network through a connecting flange.

5. The cold and hot double-channel online ash removal type GGH heat exchanger according to claim 2, characterized in that: the hot side spray pipe network level set up, hot side flue gas upper strata spray pipe network (6) and hot side flue gas lower floor spray pipe network (7) and equally divide into two modules, connect through the flange that differs and realize independent spray control.

6. The cold and hot double-channel online ash removal type GGH heat exchanger according to claim 3, characterized in that: the cold side spray pipe network vertical setting, cold side flue gas upper spray pipe network (8) and cold side flue gas lower floor spray pipe network (9) and divide into two modules, realize independent spray control through the flange connection of difference.

7. The cold and hot double-channel online ash removal type GGH heat exchanger according to claim 5, characterized in that: the hot side flue gas upper layer spraying pipe network (6) is connected with the hot side flue gas third flange (303) through a hot side flue gas first flange (301), and the hot side flue gas lower layer spraying pipe network (7) is connected with the hot side flue gas fourth flange (304) through a hot side flue gas second flange (302).

8. The cold and hot double-channel online ash removal type GGH heat exchanger according to claim 6, characterized in that: the cold side flue gas upper spray pipe network (8) connect first flange (201) of cold side flue gas import and third flange (203) of cold side flue gas import, cold side flue gas lower floor sprays pipe network (9) and corresponds and connects cold side flue gas export second flange (202) and cold side flue gas export fourth flange (204).

9. The cold and hot double-channel online ash removal type GGH heat exchanger according to claim 1, characterized in that: the plate structure of the mould pressing heat exchange module is divided into an upper stage and a lower stage, and an access hole (10) is formed in the position of an inlet top pipeline.

10. The cold and hot double-channel online ash removal type GGH heat exchanger according to claim 1, characterized in that: the heat exchange assembly (11) is composed of corrugated die pressing heat exchange sheets and supporting pieces, and the upper and lower edges of adjacent die pressing heat exchange sheets are pressed inwards, folded and welded to form welding seams to form a heat exchange unit.