Coal gas power cross type vertical plate gas heater

Abstract

The application discloses a coal gas power generation cross intersection vertical plate type coal gas heater and relates to the technical field of coal gas heaters in the steel metallurgy industry. The heater comprises a frame, a heat exchange core body is arranged on the frame, the heat exchange core body comprises a plurality of S-shaped curved surface corrugated sheets arranged longitudinally, two S-shaped curved surface corrugated sheets form a plate pair, a gas longitudinal channel is formed between adjacent plate pairs, a flue gas transverse channel is formed between the two S-shaped curved surface corrugated sheets of the plate pair, and the gas longitudinal channel is arranged adjacent to the flue gas transverse channel. The application improves the heat transfer efficiency, corrosion resistance and service life of the plate type coal gas heater and reduces the equipment ash deposition. The application avoids the defects of the heat pipe heat exchanger, such as high-temperature pipe explosion, low-temperature corrosion, easy clogging, large size and short service life. The modular structure design improves the production and assembly efficiency and facilitates the transportation and on-site installation of the equipment.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of coal gas heater in the steel and iron metallurgical industry, for example, relates to a coal gas heater for power generation with cross intersection and vertical plate. BACKGROUND

[0002] At present, the coal gas heater for steel and iron blast furnace and converter is mostly heat pipe type, the temperature of the coal gas is slightly increased after heat exchange, the heat exchange efficiency is low, a large amount of coal gas is wasted, more CO2 is discharged, fan power is wasted, and if the packing seal of the heat pipe type coal gas heater fails, coal gas leakage is caused, safe operation of equipment is affected, and even fire or explosion accidents occur.

[0003] At present, the reasons for the pipe bundle leakage of the heat pipe type coal gas heater are as follows: (1) long period boiling and condensation, non-condensed gas is formed in the pipe.

[0004] (2) excessive thermal stress caused by temperature fluctuation, pipe bundle leakage and working medium loss. CONTENT OF THE INVENTION

[0005] In order to have a basic understanding of some aspects of the disclosed embodiments, the following is a simple summary. The summary is not a general review, nor is it intended to determine the key / important components or delineate the protection scope of these embodiments, but is a prelude to the following detailed description.

[0006] In order to solve the above technical problems, the present application provides a coal gas heater for power generation with cross intersection and vertical plate; the coal gas heater for power generation with cross intersection and vertical plate can greatly increase the temperature of the coal gas, improve the gas power generation efficiency, and ensure long-term and efficient operation of the coal gas heater.

[0007] The coal gas heater for power generation with cross intersection and vertical plate provided by the present application comprises a frame, a heat exchange core is arranged on the frame, the heat exchange core comprises a plurality of S-shaped curved surface corrugated sheets arranged longitudinally; the S-shaped curved surface corrugated sheets are formed into plate pairs two by two, a coal gas longitudinal channel is formed between adjacent plate pairs, a flue gas transverse channel is formed between the two S-shaped curved surface corrugated sheets of the plate pair, and the coal gas longitudinal channel and the flue gas transverse channel are arranged adjacently.

[0008] In further improvement of the present application, the frame comprises square frames arranged on the front and back sides respectively and a middle distance plate arranged between the square frames on the front and back sides; the square frame comprises a tooth-shaped horizontal plate and a side-bent vertical plate.

[0009] In further improvement of the present application, the top and bottom of the two S-shaped curved surface corrugated sheets of the plate pair are respectively provided with sealing plates I, and the sealing plates I are connected with the middle distance plate.

[0010] In a further improvement of this utility model, sealing plates II are respectively provided on the front and rear sides of the two S-shaped curved corrugated plates of the adjacent plate pair. The top and bottom of sealing plates II are respectively connected to toothed cross plates, and the toothed cross plates are connected to the ends of sealing plates I.

[0011] In a further improvement of this invention, the gas flow direction in the longitudinal gas channel and the flue gas flow direction in the transverse flue gas channel are arranged in a cross shape.

[0012] In a further improvement of this invention, the gas in the longitudinal gas channel and the flue gas in the transverse flue gas channel are disturbed in opposite directions with a 1 / 2-period offset.

[0013] Compared with the prior art, this application has the following beneficial effects: This application can significantly increase the temperature of the gas, improve the efficiency of gas-fired power generation, and ensure the long-term efficient operation of the gas heater.

[0014] Specifically, this application improves the heat transfer efficiency, corrosion resistance, and lifespan of plate gas heaters, and reduces ash accumulation in the equipment; it avoids the disadvantages of heat pipe heat exchangers such as high-temperature tube rupture, low-temperature corrosion, easy clogging, large size, and short lifespan; the modular structure design improves production and assembly efficiency and facilitates equipment transportation and on-site installation.

[0015] The above general description and the description below are exemplary and illustrative only and are not intended to limit this application. Attached Figure Description

[0016] To more clearly illustrate the background technology or the technical solution of this application, the accompanying drawings used in conjunction with the prior art or specific embodiments are briefly introduced below. Obviously, the structures, proportions, sizes, etc. shown in the drawings are only used to complement the content disclosed in the specification, so that those skilled in the art can understand and read them, and are not intended to limit the conditions under which this application can be implemented. Therefore, they have no substantial technical significance. Any modification to the structure, change in the proportional relationship, or adjustment of the size should still fall within the scope of the technical content disclosed in this application, provided that it does not affect the effects and purposes that this application can produce.

[0017] Figure 1 This is a structural diagram illustrating a specific embodiment of this application.

[0018] Figure 2 This is a schematic diagram of the cross-sectional flow channels of the longitudinal gas channel and the transverse flue gas channel in a specific embodiment of this application.

[0019] Figure 3 This is a schematic diagram of the corrugations of an S-shaped curved corrugated plate according to a specific embodiment of this application.

[0020] Figure 4This is a schematic diagram of the gas flow direction in a specific embodiment of this application.

[0021] The diagram shows: 1. S-shaped curved corrugated plate; 2. Longitudinal gas channel; 3. Transverse flue gas channel; 4. Toothed horizontal plate; 5. Side-curved vertical plate; 6. Center spacing plate; 7. Sealing plate I; N1. Flue gas inlet; N2. Flue gas outlet; N3. Gas inlet; N4. Gas outlet. Detailed Implementation

[0022] To gain a more detailed understanding of the features and technical content of the embodiments of this application, the implementation of the embodiments of this application will be described in detail below with reference to the accompanying drawings. The accompanying drawings are for reference only and are not intended to limit the embodiments of this application. In the following technical description, for ease of explanation, multiple details are used to provide a full understanding of the disclosed embodiments. However, one or more embodiments may still be implemented without these details. In other cases, well-known structures and devices may be simplified in order to simplify the drawings.

[0023] The terms “first”, “second”, etc., used in the embodiments of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence; it should be understood that such data used can be interchanged where appropriate so as to be the embodiments of the present application described herein; furthermore, the terms “comprising” and “having”, and any variations thereof, are intended to cover non-exclusive inclusion.

[0024] In the embodiments of this application, the terms "upper," "lower," "inner," "middle," "outer," "front," and "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are mainly for better describing the embodiments of this application and their implementations, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation. Furthermore, in addition to indicating orientation or positional relationship, some of the above terms may also be used to indicate other meanings. For example, the term "upper" may also be used in some cases to indicate a certain dependency or connection relationship. For those skilled in the art, the specific meaning of these terms in the embodiments of this application can be understood according to the specific circumstances.

[0025] In addition, the terms “set up,” “connect,” and “fix” should be interpreted broadly. For example, “connection” can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0026] Unless otherwise stated, the term "multiple" means two or more.

[0027] In this embodiment of the application, the character " / " indicates that the objects before and after are in an "or" relationship. For example, Z / X means: Z or X. The term "and / or" describes the relationship between objects, indicating that there can be three relationships. For example, Z and / or X means: Z or X, or Z and X.

[0028] It should be noted that, unless otherwise specified, the embodiments and features described in the embodiments of this application can be combined with each other.

[0029] Currently, the causes of leakage in the tube bundles of heat pipe gas heaters generally fall into the following categories: (1) Long-cycle boiling and condensation, the working fluid in the tube forms non-condensable gas.

[0030] (2) Temperature fluctuations cause excessive thermal stress, tube leakage, and loss of working fluid.

[0031] Therefore, the design concept of this application is to use high-temperature flue gas to exchange heat and raise the temperature of coal gas, thereby avoiding the defects of the aforementioned heat pipe coal gas heaters from the root.

[0032] like Figures 1-4 As shown, this application provides a cross-shaped vertical plate gas heater for gas power generation, including a frame, on which a heat exchange core is provided. The heat exchange core includes several longitudinally arranged S-shaped curved corrugated plates 1; the S-shaped curved corrugated plates 1 are arranged in pairs to form a plate pair, and a longitudinal gas channel 2 is formed between adjacent plate pairs. A transverse flue gas channel 3 is formed between the two S-shaped curved corrugated plates 1 of the plate pair, and the longitudinal gas channel 2 and the transverse flue gas channel 3 are arranged adjacent to each other.

[0033] The frame includes square frames on the front and rear sides and a center-spacer plate 6 between the square frames on the front and rear sides. The square frames include toothed horizontal plates 4 and side-bent vertical plates 5. In use, the above components are welded together. The toothed horizontal plates 4 are welded to the top and bottom of the sealing plate II and the end of the sealing plate I 7, respectively, to seal the space of the longitudinal gas channel 2 and the transverse flue gas channel 3, and to isolate the flue gas from contact with the gas. The center-spacer plate 6 is connected to the sealing plate I 7 to fix the gas side channel and increase the strength of the plate pair. The side-bent vertical plates 5 are used to connect the toothed horizontal plates 4 to form the frame. The welding of the side-bent plates ensures the integrity of the frame.

[0034] Among them, the top and bottom of the two S-shaped curved corrugated plates 1 of the plate pair are respectively provided with sealing plates I7, and sealing plates I7 are connected to the center fixed distance plate 6.

[0035] Understandably, the sealing plate I7 ​​adopts a V-shaped structure. The two legs of the V-shaped structure are connected to the two S-shaped curved corrugated plates 1 respectively, thereby sealing the top and bottom of the space between the two S-shaped curved corrugated plates 1 (the space of the flue gas transverse channel 3) in a set of plates. Note that the edges of the two legs of the V-shaped structure are also wavy, which should be adapted to the shape of the S-shaped curved corrugated plates 1 to facilitate welding.

[0036] Among them, the front and rear sides of the two S-shaped curved corrugated plates 1 of the adjacent plate pair are respectively provided with sealing plates 2. The top and bottom of the sealing plates 2 are connected to the toothed horizontal plate 4 at the top and the toothed horizontal plate 4 at the bottom, respectively. The toothed horizontal plate 4 is connected to the end of the sealing plate 1 7.

[0037] It is understandable that the sealing plate II7 adopts a V-shaped structure. The two legs of the V-shaped structure are connected to the two S-shaped corrugated plates 1 of the adjacent plate pair respectively (that is, the two legs of the V-shaped structure are connected to the rear S-shaped corrugated plates 1 of the front plate pair and the front S-shaped corrugated plates 1 of the rear plate pair respectively), thereby sealing the front and rear ends of the space (gas longitudinal channel 2 space) between the two S-shaped corrugated plates 1 of the two plate pairs. Note that the edges of the two legs of the V-shaped structure are also wavy, which should be adapted to the shape of the S-shaped corrugated plates 1 to facilitate welding.

[0038] The gas flow direction in the longitudinal gas channel 2 and the flue gas flow direction in the transverse flue gas channel 3 are cross-shaped; the gas in the longitudinal gas channel 2 and the flue gas in the transverse flue gas channel 3 are disturbed in opposite directions at 1 / 2 period.

[0039] The term "cross-flow" means that the flow directions of the two media, hot side (flue gas) and cold side (coal gas), are in a cross shape on both sides of the plate, with the flow directions forming a 90° angle. This is unlike a typical plate heat exchanger, which is a pure counter-flow, where high-temperature flue gas flows between the plates and low-temperature coal gas flows between adjacent plates.

[0040] In this application, low-temperature gas enters the space between the plates of the gas heater from port N3, is heated by flue gas, and then flows out from port N4. At the same time, high-temperature flue gas enters the space between the plates of the gas heater from port N1, exchanges heat with the gas, and then flows out from port N2.

[0041] The process is characterized by flue gas flowing horizontally from right to left and coal gas flowing vertically from top to bottom, with the flow directions of the two media forming a "cross".

[0042] This invention is applied to the steel and metallurgical industries, specifically to heat the coal gas at the tail end of a coal gas power generation boiler. The coal gas exchanges heat with the flue gas through a plate-type coal gas heater, significantly increasing the coal gas temperature and improving the thermal efficiency of the coal gas power generation boiler, thus making it more energy-efficient.

[0043] The equipment consists of plates, a frame (toothed horizontal plate, central fixed distance plate, side-bending vertical plate), expansion joints, etc. It uses S-shaped curved corrugated plates as heat transfer elements and features an advanced all-welded sealing design. It has the advantages of high heat transfer efficiency, compact structure, light weight, resistance to thermal stress, and high temperature resistance. The expansion joint is installed at the flue gas inlet to absorb the core expansion caused by the high temperature of the flue gas, ensuring operational safety.

[0044] S-shaped curved corrugated plates are a type of curved corrugated plate. Any cross-sectional view along the axis shows a double S-shape with significant curvature variations. The reinforcing ribs are twisted to improve structural strength. A nested design of "large corrugations + small corrugations" enhances local stiffness and overall buckling resistance. The S-shaped curved corrugated plates also feature adjacent airflows that are alternately reversed by half a cycle, strengthening heat transfer. Advantages of S-shaped curved corrugated plates include: strong turbulence, high heat transfer coefficient; resistance to thermal stress and high temperatures; high tensile strength; and anti-clogging properties.

[0045] This gas heater uses heat transfer plates (S-shaped curved corrugated plates) to replace traditional tubes and heat pipes. The S-shaped curved corrugated plates cause adjacent airflows to be disturbed in opposite directions for half a cycle, which enhances heat exchange. The material is 2205 or 254SMo, which has stronger corrosion resistance.

[0046] Flue gas and coal gas exchange heat through plates, completely isolating the hot and cold fluids. Because the cross-sectional shape of the heat transfer plates changes continuously along the fluid flow direction, the fluid turbulence is greatly enhanced, thus increasing the fluid's heat transfer performance. Furthermore, the smooth plate surface results in lower fouling thermal resistance. The equipment adopts a fully welded structure, ensuring excellent sealing performance and effectively preventing media leakage. The plate welding utilizes automated wheel welding technology, with timely tracking, positioning, tightening, and inspection of the welding process to guarantee the welding quality of the plates and tubes.

[0047] Gas heaters can achieve turbulent flow at a flow rate of 3 m / s, and the design uses 10 to 14 m / s. At this flow rate, it is optimal to reduce dust deposition, enhance heat transfer, reduce wear, and lower resistance.

[0048] The cross-flow design ensures that the flue gas outlet temperature is above the acid dew point temperature, reducing plate corrosion caused by acid dew point and improving equipment service life.

[0049] The plate gas heater features a modular structure design, allowing for flexible combinations based on specific operating conditions, ensuring that operating parameters are met.

[0050] Through the above improvements, the advantages of this application are: improved heat transfer efficiency, corrosion resistance, and lifespan of the plate gas heater, and reduced ash accumulation in the equipment; avoidance of the disadvantages of heat pipe heat exchangers such as high-temperature tube rupture, low-temperature corrosion, easy blockage, large size, and short lifespan; and improved production and assembly efficiency through modular structural design, facilitating equipment transportation and on-site installation.

[0051] The foregoing description and accompanying drawings fully illustrate embodiments of this application to enable those skilled in the art to practice them. Other embodiments may include structural and other changes. The embodiments represent only possible variations. Unless explicitly required, individual components and functions are optional, and the order of operation may vary. Some parts and features of some embodiments may be included or replace parts and features of other embodiments. The embodiments of this application are not limited to the structures described above and shown in the accompanying drawings, and various modifications and changes may be made without departing from their scope. The scope of this application is limited only by the appended claims.

Claims

1. A cross-shaped vertical plate gas heater for gas power generation, characterized in that, The device includes a frame on which a heat exchange core is provided. The heat exchange core includes several longitudinally arranged S-shaped corrugated plates. The S-shaped corrugated plates are arranged in pairs to form a plate pair. A longitudinal gas channel is formed between adjacent plate pairs. A transverse flue gas channel is formed between the two S-shaped corrugated plates of the plate pair. The longitudinal gas channel and the transverse flue gas channel are arranged adjacent to each other.

2. The gas-fired power generation cross-shaped vertical plate gas heater according to claim 1, characterized in that, The frame includes square frames arranged on the front and rear sides respectively, and a central fixed-distance plate arranged between the front and rear square frames; the square frame includes toothed horizontal plates and side-curved vertical plates.

3. The gas-fired power generation cross-shaped vertical plate gas heater according to claim 2, characterized in that, The top and bottom of the two S-shaped curved corrugated plates of the plate pair are respectively provided with sealing plate I, and sealing plate I is connected to the center fixed distance plate.

4. The cross-shaped vertical plate gas heater for gas power generation according to claim 3, characterized in that, The front and rear sides of the two S-shaped corrugated plates of the adjacent plate pair are respectively provided with sealing plates II. The top and bottom of sealing plates II are connected to toothed cross plates, and the toothed cross plates are connected to the ends of sealing plates I.

5. The cross-shaped vertical plate gas heater for gas power generation according to claim 1, characterized in that, The gas flow direction in the longitudinal gas channel and the flue gas flow direction in the transverse flue gas channel are in a cross shape.

6. The cross-shaped vertical plate gas heater for gas power generation according to claim 5, characterized in that, The gas in the longitudinal gas channel and the flue gas in the transverse flue gas channel are disturbed in opposite directions with a 1 / 2 period.

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