阅读说明：本技术 防堵高效率热量回收换热器 (Anti-blocking high-efficiency heat recovery heat exchanger ) 是由 黄献华 胡家荣 李江涛 张涛 刘文录 候文豪 韩俊 邓炜 赵理辉 洪慧 于 2021-05-27 设计创作，主要内容包括：本发明涉及一种防堵高效率热量回收换热器,其特征在于,包括换热器框架,换热器框架顶部设有烟气侧进口组件、底部设有烟气侧出口组件,烟气侧进口组件及烟气侧出口组件分布设有烟气进口及烟气出口,换热器框架的左、右两侧分布设有一组空气侧组件,空气侧组件设有空气进/出口,位于左、右两侧的两个空气进/出口左、右相对布置；换热器框架内由上至下依次设有N组上下层叠的上板片组件、M组上下层叠的中部板片组件以及K组上下层叠的下部板片组件。本发明在不整体改变现有锅炉系统的基础上,提供了一种运行安全可靠、避免对其他设备及整个系统造成影响的一种防堵高效率热量回收换热器,以达到节能减排的目的。(The invention relates to an anti-blocking high-efficiency heat recovery heat exchanger which is characterized by comprising a heat exchanger frame, wherein the top of the heat exchanger frame is provided with a smoke side inlet assembly, the bottom of the heat exchanger frame is provided with a smoke side outlet assembly, the smoke side inlet assembly and the smoke side outlet assembly are respectively provided with a smoke inlet and a smoke outlet, the left side and the right side of the heat exchanger frame are respectively provided with a group of air side assemblies, the air side assemblies are provided with air inlet/outlet, and the two air inlet/outlet positioned at the left side and the right side are oppositely arranged left and right; n groups of upper plate assemblies stacked up and down, M groups of middle plate assemblies stacked up and down and K groups of lower plate assemblies stacked up and down are sequentially arranged in the heat exchanger frame from top to bottom. On the basis of not integrally changing the existing boiler system, the invention provides the anti-blocking high-efficiency heat recovery heat exchanger which is safe and reliable in operation and avoids influencing other equipment and the whole system, so as to achieve the purposes of energy conservation and emission reduction.)

1. An anti-blocking high-efficiency heat recovery heat exchanger is characterized by comprising a heat exchanger frame, wherein a flue gas side inlet assembly is arranged at the top of the heat exchanger frame, a flue gas side outlet assembly is arranged at the bottom of the heat exchanger frame, a flue gas inlet and a flue gas outlet are respectively arranged on the flue gas side inlet assembly and the flue gas side outlet assembly, a group of air side assemblies are respectively arranged on the left side and the right side of the heat exchanger frame, an air inlet/outlet is arranged on each air side assembly, and the two air inlet/outlets positioned on the left side and the right side are oppositely arranged on the left side and the right side;

n groups of upper sheet assemblies stacked up and down, M groups of middle sheet assemblies stacked up and down and K groups of lower sheet assemblies stacked up and down are sequentially arranged in the heat exchanger frame from top to bottom, wherein N is more than or equal to 1, M is more than or equal to 1, and K is more than or equal to 1; the position of the middle plate component corresponds to the position of the air inlet/outlet, so that the two air inlet/outlet are respectively positioned at the left side and the right side of the middle plate component;

the upper plate assembly, the middle plate assembly and the lower plate assembly have the same structure and respectively comprise a plurality of plates which are stacked up and down and side face seal plates arranged on the front side and the rear side of the stacked plates; a gap is reserved between the two adjacent plates at the upper part and the lower part and is used as a smoke channel for introducing smoke or an air channel for introducing air, and the smoke channel and the air channel are arranged at intervals; if the channel width of the smoke channel is D1 and the channel width of the air channel is D2, the following steps are provided: d1> D2.

2. The anti-clogging high efficiency heat recovery heat exchanger of claim 1 wherein the flue gas side inlet assembly, the flue gas side outlet assembly and the air side assembly all take the form of a dome.

3. The anti-clogging high efficiency heat recovery heat exchanger of claim 1 wherein a first stationary rotary steam sootblower assembly is provided between the top of the heat exchanger frame and the flue gas side inlet assembly.

4. The anti-clogging high efficiency heat recovery heat exchanger of claim 3 wherein a second stationary rotary steam sootblower assembly is provided between the upper and middle plate assemblies.

5. The anti-clogging high efficiency heat recovery heat exchanger of claim 3 wherein the front side of the heat exchanger frame is provided with support structure members located below the second stationary rotary steam sootblower assembly; and a support leg is arranged between the support structural member and the fixed rotary steam soot blower assembly II.

6. The anti-clogging high efficiency heat recovery heat exchanger of claim 4 wherein the first stationary rotary steam sootblower assembly is identical in construction to the second stationary rotary steam sootblower assembly.

7. The anti-clogging high efficiency heat recovery heat exchanger of claim 6 wherein either the first stationary rotary steam sootblower assembly or the second stationary rotary steam sootblower assembly includes a frame structure having the same shape as the heat exchanger frame, the frame structure having a rotatable steam inlet on each of a front side and a rear side thereof.

8. The anti-clogging high efficiency heat recovery heat exchanger of claim 1 wherein the plate surfaces have circular bump structures of different sizes and circular depression structures of different sizes, all of which are randomly and uniformly distributed on the plate surfaces.

9. The anti-clogging high efficiency heat recovery heat exchanger of claim 8 wherein there are two different sizes of said rounded peak structures, a large rounded peak structure with a longer length and a smaller arc and a small rounded peak structure with a shorter length and a larger arc.

10. An anti-clogging high efficiency heat recovery heat exchanger as claimed in claim 8 wherein there are two different sizes of said circular concave structures, a large circular concave structure with a longer length and a smaller arc and a small circular concave structure with a shorter length and a larger arc.

Technical Field

The invention relates to an anti-blocking high-efficiency heat recovery heat exchanger, and belongs to the field of flue gas/waste gas environmental protection and energy conservation.

Background

At present, a power plant boiler generally adopts a tubular economizer to improve the temperature of fresh air entering the boiler so as to achieve the aim of energy conservation. However, the tubular economizer has low heat exchange efficiency and large volume, so that the temperature of the raw flue gas still has large heat which cannot be fully recycled, and a large amount of heat energy is lost. During heating in winter, load can increase because of heating needs, and the flue gas waste heat that is not utilized can be more.

The plate-type flue gas heat exchanger is a novel flue gas heat exchanger structure and has the characteristics of small volume, light weight, high heat exchange efficiency, easiness in installation, simplicity and convenience in maintenance, difficulty in blockage and the like. The flue gas waste heat before the dust removal of the power plant is easy to block and wear equipment because of large dust amount, so that the related heat is difficult to recycle. The traditional tubular heat exchanger is low in heat exchange efficiency and large in size, meanwhile, after the tubular heat exchanger is operated, blockage is not easy to clean, the maintenance difficulty is high, and long-term normal operation cannot be guaranteed.

Disclosure of Invention

The purpose of the invention is: the flue gas heat exchanger can make full use of the flue gas waste heat.

In order to achieve the purpose, the technical scheme of the invention provides an anti-blocking high-efficiency heat recovery heat exchanger which is characterized by comprising a heat exchanger frame, wherein a smoke side inlet assembly is arranged at the top of the heat exchanger frame, a smoke side outlet assembly is arranged at the bottom of the heat exchanger frame, the smoke side inlet assembly and the smoke side outlet assembly are respectively provided with a smoke inlet and a smoke outlet, a group of air side assemblies are respectively arranged at the left side and the right side of the heat exchanger frame, the air side assemblies are provided with air inlet/outlet openings, and the two air inlet/outlet openings positioned at the left side and the right side are oppositely arranged at the left side and the right side;

n groups of upper sheet assemblies stacked up and down, M groups of middle sheet assemblies stacked up and down and K groups of lower sheet assemblies stacked up and down are sequentially arranged in the heat exchanger frame from top to bottom, wherein N is more than or equal to 1, M is more than or equal to 1, and K is more than or equal to 1; the position of the middle plate component corresponds to the position of the air inlet/outlet, so that the two air inlet/outlet are respectively positioned at the left side and the right side of the middle plate component;

the upper plate assembly, the middle plate assembly and the lower plate assembly have the same structure and respectively comprise a plurality of plates which are stacked up and down and side face seal plates arranged on the front side and the rear side of the stacked plates; a gap is reserved between the two adjacent plates at the upper part and the lower part and is used as a smoke channel for introducing smoke or an air channel for introducing air, and the smoke channel and the air channel are arranged at intervals; if the channel width of the smoke channel is D1 and the channel width of the air channel is D2, the following steps are provided: d1> D2.

Preferably, the flue gas side inlet assembly, the flue gas side outlet assembly and the air side assembly all adopt a hemispherical square structural form.

Preferably, a first fixed rotary steam soot blower assembly is arranged between the top of the heat exchanger frame and the flue gas side inlet assembly.

Preferably, a second fixed rotary steam soot blower assembly is arranged between the upper plate assembly and the middle plate assembly.

Preferably, a supporting structural member is arranged on the front side of the heat exchanger frame and is positioned below the second fixed rotary steam soot blower assembly; and a support leg is arranged between the support structural member and the fixed rotary steam soot blower assembly II.

Preferably, the first fixed rotary steam soot blower assembly and the second fixed rotary steam soot blower assembly have the same structure.

Preferably, the first fixed rotary steam soot blower assembly or the second fixed rotary steam soot blower assembly comprises a frame structure having the same shape as the heat exchanger frame, and a rotatable steam inlet is respectively provided at the front side and the rear side of the frame structure.

Preferably, the surface of the plate has circular bump structures and circular recess structures with different sizes, and all the circular bump structures and the circular recess structures are randomly and uniformly distributed on the surface of the plate.

Preferably, there are two different sizes of the circular bump structures, which are a large circular bump structure with a longer length and a smaller radian and a small circular bump structure with a shorter length and a larger radian.

Preferably, there are two different sizes of the circular recessed structures, which are respectively a large circular recessed structure with a longer length and a smaller radian and a small circular recessed structure with a shorter length and a larger radian.

On the basis of not integrally changing the existing boiler system, the invention provides the anti-blocking high-efficiency heat recovery heat exchanger which is safe and reliable in operation and avoids influencing other equipment and the whole system, so as to achieve the purposes of energy conservation and emission reduction.

The all-welded plate type heat exchanger is a novel heat exchanger structure suitable for a flue gas-air heat exchanger, and has the advantages of high heat exchange efficiency, small volume, light weight, easiness in installation and maintenance, difficulty in blockage, corrosion resistance, long service life, low investment cost and the like. The heat transfer element of the all-welded plate heat exchanger provided by the invention is a convex point type stainless steel plate, and an innovative convex point structure with different heights is adopted, so that the heat transfer effect can be improved, the gas resistance can be reduced, and the sufficient supporting mechanical strength between plates can be ensured.

Drawings

FIG. 1 is a perspective view of the present invention;

FIG. 2 is a schematic front view of the present invention;

FIG. 3 is a schematic structural view of a stationary rotary steam sootblower assembly;

FIG. 4 is a schematic view of a panel of the present invention;

FIG. 5 is a sectional view taken along line A-A in FIG. 4;

FIG. 6 is a sectional view taken along line B-B in FIG. 4;

FIG. 7 is a cross-sectional view taken along line C-C of FIG. 4;

fig. 8 is a sectional view taken along line D-D in fig. 4.

Detailed Description

The invention will be further illustrated with reference to the following specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and such equivalents may fall within the scope of the present invention as defined in the appended claims.

As shown in fig. 1 and 2, the anti-blocking high-efficiency heat recovery heat exchanger provided by the invention adopts a plate type structure with high heat exchange efficiency and a full-welding type, and comprises a heat exchanger frame, an upper plate assembly 1, a first fixed rotary steam soot blower assembly 2, a lower plate assembly 3, a second fixed rotary steam soot blower assembly 4, a middle plate assembly 5, support legs 6, an air side skyline square assembly 7, a flue gas side skyline square inlet assembly 8, a flue gas side skyline square outlet assembly 9, a support structural member 10, a side sealing plate 11 and the like.

The top of the heat exchanger frame is provided with a flue gas side hemispherical dome inlet assembly 8 (the structural shape of the flue gas side hemispherical dome inlet assembly 8 is referred to in fig. 1, and is not described herein again), the flue gas side hemispherical dome inlet assembly 8 is provided with a circular flue gas inlet, and high-temperature flue gas enters the heat exchanger provided by the invention through the flue gas inlet. A fixed rotary steam soot blower assembly I2 is arranged below the flue gas side hemispherical square inlet assembly 8. The structure of the fixed rotary steam soot blower assembly one 2 is shown in figure 3, and comprises a frame structure 2-1 with the same shape as the heat exchanger frame, wherein the front side and the rear side of the frame structure 2-1 are respectively provided with a rotatable steam inlet 2-2. A steam pipeline can be arranged in the middle of one ball joint in a penetrating mode, then the ball joint is fixed on the frame structure 2-1, rotation of the steam inlet 2-2 is achieved, and a person skilled in the art can also adopt other structures to achieve rotation of the steam inlet 2-2, and details are not repeated here. The flue gas side hemispherical dome inlet assembly 8 is fixed at the top of the fixed rotary steam soot blower assembly I2, and the fixed rotary steam soot blower assembly I2 is fixed at the top of the heat exchanger frame. The high-temperature flue gas entering through the flue gas side hemispherical inlet assembly 8 firstly passes through the fixed rotary steam soot blower assembly I2 and then enters the heat exchanger frame.

A group of air side hemispherical dome assemblies 7 are respectively arranged on the left side and the right side of the heat exchanger frame (the structural shape of the air side hemispherical dome assemblies 7 is referred to in fig. 1, and the description is omitted here), and each air side hemispherical dome assembly 7 has a circular air side inlet. The two air side inlets/outlets on the left and right sides are arranged oppositely left and right.

The bottom of the heat exchanger frame is provided with a flue gas side hemispherical dome outlet assembly 9 (the structural shape of the flue gas side hemispherical dome outlet assembly 9 is referred to fig. 1, and is not described herein again), and the flue gas side hemispherical dome outlet assembly 9 has a circular flue gas side outlet.

And a plurality of groups of upper plate assemblies 1, a plurality of groups of fixed rotary steam soot blower assemblies II 4, a plurality of groups of middle plate assemblies 5 and a plurality of groups of lower plate assemblies 3 are sequentially arranged in the heat exchanger frame from top to bottom. The middle sheet assembly 5 is disposed at a position corresponding to the positions of the air side inlets/outlets such that the two air side inlets/outlets are respectively located on the left and right sides of the middle sheet assembly 5. The structure of the second fixed rotary steam soot blower assembly 4 is the same as that of the first fixed rotary steam soot blower assembly 2, and the details are not repeated here. High-temperature flue gas entering from a flue gas inlet passes through the first fixed rotary steam soot blower assembly 2, then passes through the second fixed rotary steam soot blower assembly 4 after passing through the upper plate assembly 1, and then sequentially passes through the middle plate assembly 5 and the lower plate assembly 3. In the process, air enters the middle plate component 5 from the side through the air side inlet/outlet of the air side hemispherical square component 7 on one side, exchanges heat with high-temperature flue gas, and then exits the heat exchanger provided by the invention from the air side inlet/outlet of the air side hemispherical square component 7 on the other side. The high-temperature flue gas is fully contacted with air for heat exchange in the process of flowing through the middle plate component 5.

The upper plate assembly 1, the middle plate assembly 5 and the lower plate assembly 3 have the same structure and respectively comprise a plurality of plates which are stacked up and down and side face seal plates 11 which are arranged on the front side and the rear side of the stacked plates. A gap is reserved between the two adjacent plates to be used as a smoke channel for introducing smoke and an air channel for introducing air. The smoke channel and the air channel are arranged at intervals, so that heat exchange between high-temperature smoke entering the smoke channel and low-temperature air entering the air channel is realized. It should be noted that: the arrangement of the smoke channel and the air channel is common knowledge of the skilled person, and the detailed structure thereof will not be described in detail in the present invention. Compared with the prior art, the improved smoke channel has the advantages that the channel width of the smoke channel is increased to 25mm, and the smoke dust is prevented from being blocked. Since the air side gas is fresh clean gas, in the present embodiment, the channel width of the air channel is set to 10 mm. Through the design of the intervals of different flue gas channels of the upper plate piece assembly 1, the lower plate piece assembly 3 and the middle plate piece assembly 5, the blockage of the flue gas side can be reduced, and meanwhile, higher heat exchange efficiency can be guaranteed.

In the invention, as shown in fig. 4, the plate sheets are uniformly distributed with circular bump structures and circular recess structures with different sizes, and all the circular bump structures and the circular recess structures are randomly and uniformly distributed on the surface of the plate sheets. In this embodiment, there are two different sizes of circular bump structures, namely, a large circular bump structure with a longer length and a smaller radian and a small circular bump structure with a shorter length and a larger radian. In this embodiment, as shown in fig. 5, the length L1 of the large circular bump structure is about 53.55mm, the R1 radian is about 153 °, the top width D1 is about 10mm, the length L2 of the small circular bump structure is about 39.4mm, the radian R2 is about 171 °, the top width D2 is about 3mm, and the height H1 is about 1.5 mm. There are two kinds of circular sunk structures of different sizes, be the great circular sunk structure that length is longer and the radian is less and the great little circular sunk structure of length and radian respectively. In this embodiment, the length L3 of the large circular depression structure is about 53.55mm, the arc R3 is about 153 °, the bottom width D3 is 10mm, the depth Dp1 is 5mm, the length L4 of the small circular depression structure is about 39.7mm, the arc R4 is about 171 °, the bottom width D4 is 3mm, and the depth Dp2 is 1.5 mm. The plate is formed by one-time stamping of a laminated film, has smooth surface, no dead angle and included angle, strong trafficability characteristic, small residual stress, difficult blockage and easy cleaning.

The invention adopts the design of a plate type structure, has high heat transfer efficiency, can recover the heat of the original flue gas as much as possible, improves the temperature of fresh air entering the furnace and achieves the aim of saving energy.

And a supporting structural member 10 is also arranged at the front side of the heat exchanger frame, and the supporting structural member 10 is positioned below the second fixed rotary steam soot blower assembly 4. A support leg 6 is arranged between the support structure 10 and the second fixed rotary steam soot blower assembly 4.

In order to prevent blockage and perform online cleaning, the invention is provided with two groups of fixed rotary steam soot blowers which are respectively positioned at the upper part and the middle part and are a first fixed rotary steam soot blower assembly 2 and a second fixed rotary steam soot blower assembly 4. The upper plate assembly 1, the middle plate assembly 5 and the lower plate assembly 3 are periodically cleaned by utilizing two groups of fixed rotary steam soot blowers, so that the side blockage of the raw flue gas containing high solid particles is prevented. The first fixed rotary steam soot blower assembly 2 and the second fixed rotary steam soot blower assembly 4 provided by the invention can effectively clean all passages, especially dust containing sticky substances, in a limited space. The first fixed rotary steam soot blower assembly 2 is mainly used for cleaning the upper plate assembly 1, and the second fixed rotary steam soot blower assembly 4 is mainly used for cleaning the middle plate assembly 5 and the lower plate assembly 3.

According to the calculation of the temperature of the inlet of the flue gas of 664 ℃, the heat quantity recovered by the heat exchanger per hour is as follows: q18050 Nm³1.296 × 1.19 × 299/3600 ≈ 8323200KJ 284 kg of standard coal. At 8000 hours of operation per year, a standard coal saving of about 2272 tons per year can be achieved.