CN217875922U

CN217875922U - High-temperature energy-saving plate preheater

Info

Publication number: CN217875922U
Application number: CN202221905787.2U
Authority: CN
Inventors: 李振建; 程镇; 渐林呐
Original assignee: Shandong Wintech Technology Co ltd
Current assignee: Shandong Wintech Technology Co ltd
Priority date: 2022-07-22
Filing date: 2022-07-22
Publication date: 2022-11-22
Anticipated expiration: 2032-07-22

Abstract

The utility model relates to an energy-conserving plate preheater of high temperature, including casing and board bundle, the left and right sides of casing is equipped with flue gas inlet and exhanst gas outlet respectively, and the top of board bundle hangs inside the casing, is equipped with the recess on the casing of board bundle below, is equipped with clearance one between board bundle bottom and the recess, and board bundle both sides are equipped with clearance two with flue gas inlet and exhanst gas outlet inner. Preferably, the plate bundle comprises a low-temperature cold-side header, a low-temperature plate bundle, an air duct box, a high-temperature plate bundle and a high-temperature cold-side header, and the five components form a U-shaped plate bundle structure. The utility model discloses the top of board bundle is hung and is fixed inside the casing to import and export between bottom and both sides and casing and the flue gas of board bundle and by leaving the clearance, when flue gas temperature changes, vertical direction and the free expansion and contraction of horizontal direction can be followed to the board bundle, solve and be difficult to solve the problem of thermal energy in the face of the high temperature flue gas.

Description

High-temperature energy-saving plate preheater

Technical Field

The utility model belongs to the technical field of preheat, concretely relates to energy-conserving plate preheater of high temperature.

Background

The plate-type gas/air preheater is used for a blast furnace engineering hot blast stove system, recovers the waste heat of flue gas of the hot blast stove, and preheats the gas and combustion-supporting air for the hot blast stove. The inlet temperature of the preheater flue gas is generally 300-380 ℃.

In recent years, with the change of the concept of waste heat recovery and the large-scale equipment, the design parameters of flue gas waste heat recovery are gradually changed, the temperature of the flue gas inlet of the preheater can reach 600-800 ℃, and the preheater has a furnace type with a large heat load, such as an ethylene cracking furnace, a hydrogen production conversion furnace, an incinerator and the like.

Because the temperature of the flue gas inlet of the preheater rises, the thermal expansion deformation of the heat exchange plate bundle of the preheater is larger and larger, the plate bundle and the shell of the existing plate preheater are rigidly connected, and the problem of thermal expansion is difficult to solve in the face of high-temperature flue gas.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing an energy-conserving plate heater of high temperature solves all to be rigid connection between present pre-heater plate bundle and the casing, is difficult to solve the problem of thermal energy in the face of the high temperature flue gas.

The utility model relates to an energy-conserving plate preheater of high temperature, including casing and board bundle, the left and right sides of casing is equipped with flue gas inlet and exhanst gas outlet respectively, and the top of board bundle hangs inside the casing, is equipped with the recess on the casing of board bundle below, is equipped with clearance one between board bundle bottom and the recess, and board bundle both sides are equipped with clearance two with flue gas inlet and exhanst gas outlet inner. The plate bundle is provided with an inlet and an outlet of coal gas or air, and when the coal gas or the air passes through the U-shaped channel of the plate preheater, the coal gas or the air and high-temperature flue gas transversely passing through the preheater form cross-flow heat exchange.

Preferably, the plate bundle comprises a low-temperature cold-side header, a low-temperature plate bundle, an air duct box, a high-temperature plate bundle and a high-temperature cold-side header, and the five components form a U-shaped plate bundle structure. Coal gas or air enters from the low-temperature cold-side header and then enters the vertical flow channel in the low-temperature plate bundle to enter the air channel header, then enters the vertical flow channel in the high-temperature plate bundle and then is discharged from the high-temperature cold-side header, and flue gas enters the horizontal flow channel in the high-temperature plate bundle from the flue gas inlet and then enters the horizontal flow channel in the low-temperature plate bundle and then is discharged from the flue gas outlet.

Preferably, the low-temperature cold-side header is fixed at the top of the low-temperature plate bundle, the high-temperature cold-side header is fixed at the top of the high-temperature plate bundle, the air channel header is fixed at the bottoms of the low-temperature plate bundle and the high-temperature plate bundle and is used for communicating an air or gas flow channel of the low-temperature plate bundle with the high-temperature plate bundle, a flue gas flow channel communicated with a flue gas inlet and a flue gas outlet is arranged in the low-temperature plate bundle and the high-temperature plate bundle, the flue gas flow channel is not communicated with the air or gas flow channel, and the air channel header extends into the groove.

Preferably, a communicating pipeline for communicating flue gas channels of the low-temperature plate bundle and the high-temperature plate bundle is arranged between the low-temperature plate bundle and the high-temperature plate bundle. The flue gas is convenient to communicate.

Preferably, a distance a between the air duct channel box and the bottom of the groove is a first gap, a distance b between the air duct channel box and the side wall of the groove is a second gap, a is 50-80mm, and b is 15-20 mm. The length of the first gap and the second gap can be selected according to the width and the length of the plate bundle.

Preferably, the shell is made of a steel section frame, and inner linings are arranged in the steel section frame, the low-temperature cold-side header and the high-temperature cold-side header. The inner lining is a heat-resistant lining, so that the lining is more resistant to high temperature.

Preferably, a plurality of U-shaped plate bundles are arranged in the shell in parallel in the front-back direction or in parallel in the left-right direction, and adjacent low-temperature cold-side headers and high-temperature cold-side headers in adjacent U-shaped plate bundles are connected through air pipes. Better heat exchange can be achieved.

Compared with the prior art, the utility model has the advantages of:

the top of the plate bundle is suspended and fixed in the shell, gaps are reserved between the bottom and two sides of the plate bundle and the shell and between the smoke inlet and the smoke outlet, when the temperature of smoke changes, the plate bundle can freely expand and contract in the vertical direction and the horizontal direction, and the problem that the thermal expansion is difficult to solve by facing high-temperature smoke is solved.

Drawings

FIG. 1 is a schematic view of the structure of the present invention;

FIG. 2 is a left side view of the structure of the present invention;

FIG. 3 is a schematic structural view of two U-shaped plate bundles arranged side by side in the left-right direction;

FIG. 4 is a schematic structural view of two U-shaped plate bundles arranged in parallel in the front-rear direction;

in the figure: 1. the device comprises a shell, 1-1 parts of a section steel frame, 1-2 parts of a smoke inlet, 1-3 parts of an inner lining, 1-4 parts of a groove, 1-5 parts of a smoke outlet, 2 parts of a plate bundle, 2-1 parts of a low-temperature cold-side header, 2-2 parts of a low-temperature plate bundle, 2-3 parts of an air duct header, 2-4 parts of a high-temperature plate bundle, 2-5 parts of a high-temperature cold-side header, 2-6 parts of a communication pipeline, 3 parts of an air pipe.

Detailed Description

The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.

Embodiment 1, as shown in fig. 1 and 2, the utility model discloses a high temperature energy-saving plate preheater, including casing 1 and board bundle 2, the left and right sides of casing 1 is equipped with inlet for flue gas 1-2 and exhanst gas outlet 1-5 respectively, its characterized in that: the top of the plate bundle 2 is hung in the shell 1, a groove 1-4 is arranged on the shell 1 below the plate bundle 2, a first gap is arranged between the bottom of the plate bundle 2 and the groove 1-4, and a second gap is arranged between the two sides of the plate bundle 2 and the inner ends of the flue gas inlet 1-2 and the flue gas outlet 1-5.

The plate bundle 2 comprises a low-temperature cold-side header 2-1, a low-temperature plate bundle 2-2, an air duct channel box 2-3, a high-temperature plate bundle 2-4 and a high-temperature cold-side header 2-5, and the five components form a U-shaped plate bundle 2 structure. The upper ends of the high-temperature plate bundles 2-4 are welded with the periphery of the lower portion of the high-temperature cold-side header 2-5, the lower ends of the low-temperature plate bundles 2-2 and the high-temperature plate bundles 2-4 are welded with the top of the air duct header 2-3, the periphery is guaranteed to be sealed and welded during welding, and the strength of a welding seam is not lower than that of a base metal.

The single U-shaped plate bundle 2 is a heat exchange module unit with the minimum steel structure stability and strength, the upper part of the high-low temperature plate bundle is welded on the cold-side header, the lower part naturally sags, the upper welding seam bears the weight load, the single U-shaped plate bundle is not easy to exceed 15 tons due to safety consideration, and the weight of the single U-shaped plate bundle is reduced when the temperature is higher.

The low-temperature cold-side header 2-1 is fixed at the top of the low-temperature plate bundle 2-2, the high-temperature cold-side header 2-5 is fixed at the top of the high-temperature plate bundle 2-4, the air duct channel 2-3 is fixed at the bottoms of the low-temperature plate bundle 2-2 and the high-temperature plate bundle 2-4 and is used for communicating an air or coal gas flow channel of the low-temperature plate bundle 2-2 and the high-temperature plate bundle 2-4, a flue gas flow channel communicated with the flue gas inlet 1-2 and the flue gas outlet 1-5 is arranged in the low-temperature plate bundle 2-2 and the high-temperature plate bundle 2-4, the flue gas flow channel is not communicated with the air or coal gas flow channel, and the air duct channel 2-3 extends into the groove 1-4.

A communicating pipeline 2-6 for communicating flue gas channels of the low-temperature plate bundle 2-2 and the high-temperature plate bundle 2-4 is arranged between the two.

The distance a between the air duct channel box 2-3 and the bottom of the groove 1-4 is a first gap, the distance b between the air duct channel box 2-3 and the side wall of the groove 1-4 is a second gap, a is 50mm-80mm, and b is 15mm-20mm.

The shell 1 is made of a steel section frame 1-1, and inner linings 1-3 are arranged in the steel section frame 1-1, the low-temperature cold-side header 2-1 and the high-temperature cold-side header 2-5. The lengths of the high-temperature plate bundle 2-4 and the low-temperature plate bundle 2-2 are the same, and the plate thickness of the high-temperature plate bundle 2-4 is equal to or larger than that of the low-temperature plate bundle 2-2. When the flue gas duct space is sufficient to accommodate the U-shaped plate bundle 2, the gas or air preheater need not be fabricated with the housing 1.

Under the condition of high-temperature flue gas (500-800 ℃), the high-temperature heat exchange plates are safe and reliable, stainless steel plates with the thickness of 1.5mm are preferably adopted, and stainless steel plates with the thickness of 1.2mm are preferably adopted for the low-temperature heat exchange plates; the cold and hot media exchange heat in the equipment by separating the stainless steel corrugated plate, the heat exchange effect is good, the resistance is small, the deposition and scaling are not easy, and the hot-blast stove is the best combustion-supporting gas or air preheating equipment at present.

When the preheater is installed, the upper part of the U-shaped plate bundle 2 is fixedly connected with the top of the shell 1 of the preheater or the top of the flue, the lower part is in a suspension state, smoke horizontally flows, and the upper part is an installation opening of the U-shaped plate bundle 1, namely an inlet and an outlet of coal gas or air. Coal gas or air enters from a low-temperature cold-side header 2-1 through a vertical flow channel in the plate, passes through a low-temperature plate bundle 2-2, an air duct channel box 2-3 and a high-temperature plate bundle 2-4, and exits from a high-temperature cold-side header 2-5; the flue gas enters a horizontal flow channel in the high-temperature plate bundle 2-4 from the flue gas inlet 1-2, then enters a horizontal flow channel in the low-temperature plate bundle 2-2, is discharged from the flue gas outlet 1-5, and flows in a staggered manner with the trend of coal gas or air.

The working principle is as follows: the top of the plate bundle 2 is suspended and fixed in the shell 1, gaps are reserved between the bottom and two sides of the plate bundle 2 and the shell 1 and the smoke inlet and outlet, when the temperature of smoke changes, the plate bundle 2 can freely expand and contract in the vertical direction and the horizontal direction, and the problem that the thermal expansion is difficult to solve in the face of high-temperature smoke is solved.

In embodiment 2, on the basis of embodiment 1, a plurality of U-shaped plate bundles 2 are arranged in parallel in the front-rear direction in a casing 1, and a low-temperature cold-side header 2-1 and a high-temperature cold-side header 2-5 adjacent to each other in the adjacent U-shaped plate bundles 2 are connected by a gas pipe 3.

The preheater receives other factors such as heat transfer medium end difference size, mass flow, the required heat transfer area is different naturally, and the board bundle weight is not of uniform size, according to the operating mode requirement, the preheater can set up m row or n row U type board bundles, and the column number and the number of beats of U type board bundle also can the independent assortment.

In embodiment 3, different from embodiment 2, a plurality of U-shaped plate bundles 2 are juxtaposed in the left-right direction in the casing 1, and the adjacent low-temperature cold-side header 2-1 and high-temperature cold-side header 2-5 in the adjacent U-shaped plate bundles 2 are connected by the gas pipe 3.

To sum up, the utility model discloses the top of board bundle hangs to be fixed inside the casing to import and export between bottom and both sides and casing and the flue gas of board bundle and by leaving the clearance, when the flue gas temperature changes, vertical direction and the free expansion and contraction of horizontal direction can be followed to the board bundle, solve and be difficult to solve the problem of thermal energy in the face of the high temperature flue gas.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

In the description of the present invention, the terms "inside", "outside", "longitudinal", "lateral", "up", "down", "top", "bottom", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description of the present invention rather than requiring the present invention to be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.

Claims

1. The utility model provides an energy-conserving plate preheater of high temperature, includes casing (1) and board bundle (2), and the left and right sides of casing (1) is equipped with flue gas inlet (1-2) and exhanst gas outlet (1-5) respectively, its characterized in that: the top of the plate bundle (2) is hung in the shell (1), a groove (1-4) is formed in the shell (1) below the plate bundle (2), a first gap is formed between the bottom of the plate bundle (2) and the groove (1-4), and a second gap is formed between the two sides of the plate bundle (2) and the inner ends of the flue gas inlet (1-2) and the flue gas outlet (1-5).

2. A high temperature energy saving plate preheater as recited in claim 1, wherein: the plate bundle (2) comprises a low-temperature cold-side header (2-1), a low-temperature plate bundle (2-2), an air duct pipe box (2-3), a high-temperature plate bundle (2-4) and a high-temperature cold-side header (2-5), and the five components form a U-shaped plate bundle (2) structure.

3. A high temperature energy saving plate preheater as claimed in claim 2, wherein: the low-temperature cold-side header box (2-1) is fixed at the top of the low-temperature plate bundle (2-2), the high-temperature cold-side header box (2-5) is fixed at the top of the high-temperature plate bundle (2-4), the air duct header box (2-3) is fixed at the bottoms of the low-temperature plate bundle (2-2) and the high-temperature plate bundle (2-4) and is used for communicating an air or gas flow channel of the low-temperature plate bundle (2-2) and the high-temperature plate bundle (2-4), a flue gas flow channel for communicating a flue gas inlet (1-2) with a flue gas outlet (1-5) is arranged in the low-temperature plate bundle (2-2) and the high-temperature plate bundle (2-4), the flue gas flow channel is not communicated with the air or gas flow channel, and the air duct header box (2-3) extends into the groove (1-4).

4. A high temperature energy saving plate preheater as recited in claim 3, wherein: a communicating pipeline (2-6) for communicating flue gas channels of the low-temperature plate bundle (2-2) and the high-temperature plate bundle (2-4) is arranged between the two plate bundles.

5. A high temperature energy saving plate preheater as recited in claim 3, wherein: the distance a between the air duct channel box (2-3) and the bottom of the groove (1-4) is a first gap, the distance b between the air duct channel box (2-3) and the side wall of the groove (1-4) is a second gap, a is 50-80mm, and b is 15-20 mm.

6. A high temperature energy saving plate preheater as recited in claim 3, wherein: the shell (1) is made of a section steel framework (1-1), and inner linings (1-3) are arranged in the section steel framework (1-1), the low-temperature cold-side header (2-1) and the high-temperature cold-side header (2-5).

7. A high temperature energy saving plate preheater as recited in claim 3, wherein: a plurality of U-shaped plate bundles (2) are arranged in the shell (1) in parallel in the front-back direction or in the left-right direction, and the adjacent low-temperature cold-side header (2-1) in the U-shaped plate bundles (2) are connected with the high-temperature cold-side header (2-5) through air pipes (3).