Horizontal straight tubular steam generation mechanism

Abstract

The utility model relates to a horizontal straight through-flow type steam generating mechanism, which comprises a steam furnace body, which is transversely divided into a preheating section and a heating evaporation section which are sequentially communicated with each other; the smoke collecting cavity is arranged at the top of the steam furnace body; the combustor is used for generating high-temperature flue gas; the preheating pipe is arranged in the preheating section, and the bottom of the preheating pipe is connected with an external water supply pipeline; the steam generation assembly is arranged in the heating evaporation section and comprises a plurality of vertically-through smoke exhaust tube nests arranged side by side in the transverse direction and a steam generation jacket arranged around the smoke exhaust tube nests, a steam generation cavity is further formed between the steam generation jacket and the smoke exhaust tube nests, the top ends of the smoke exhaust tube nests extend into the smoke collection cavity, and the top ends of the smoke exhaust tube nests extend into the smoke collection cavity. The bottom ends of the steam generating cavities are suspended in the steam furnace body, and the steam generating cavities are sequentially communicated in series in the transverse direction. Compared with the prior art, by optimizing and adjusting the heating layout of high-temperature flue gas to water vapor in the steam making assembly, the problem of thermal fatigue of the steam making assembly is effectively solved, and the heating efficiency is further improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to steam generator technical field relates to a horizontal straight through flow type steam generator. BACKGROUND

[0002] Steam generator is a kind of compact equipment by heating system and is widely used in industry, food processing, medical disinfection etc., wherein, through-flow steam generator is by the planning of array pipe composition, water pump is given water in array pipe one end, and water is in array pipe through heating section, evaporation section, from the pipe upper header box produces the steam required.

[0003] The existing through-flow steam generator is generally heated by high-temperature flue gas generated by high-temperature burner when working, which is easy to produce thermal fatigue after long time use, affecting service life, and heating efficiency needs to be further improved.

[0004] As the utility model person has applied for China patent CN115451390A provides a column pipe through-flow condensing steam generator, it includes steam furnace, combustion engine and water supply pump etc., the patent can improve heating efficiency to a certain extent by adopting fin, fin plate, wing tube etc., but the area close to steam outlet above column pipe is easy to be damaged due to thermal fatigue after long time use, but the area close to water inlet below column pipe is basically intact, that is to say, the steam generator of the patent still cannot solve the reason that column pipe is easy to produce thermal fatigue, in addition, there is still further improvement space in heating efficiency. UTILITY MODEL CONTENT

[0005] The utility model aims at providing a horizontal straight through flow type steam generator, which optimizes the heating layout of high-temperature flue gas to water vapor in the steam generating assembly, effectively improves the heating efficiency and improves the thermal fatigue problem of the steam generating assembly.

[0006] The purpose of the utility model can be realized by the following technical solutions:

[0007] A horizontal straight through flow type steam generator, comprising:

[0008] Steam furnace body with hollow cavity, the hollow cavity is divided into preheating section and heating evaporation section in sequence along the transverse direction;

[0009] Smoke collecting cavity arranged at the top of the steam furnace body for collecting flue gas discharged from the steam furnace body;

[0010] Burner provided at one end of the hollow cavity close to the preheating section for generating high-temperature flue gas for heating;

[0011] A preheating pipe arranged in the preheating section and connected with an external water supply pipeline at the bottom, used to reduce the temperature of flue gas sent into the heating evaporation section and generate preheated steam-water mixture;

[0012] A plurality of rows of steam generating assemblies arranged in the heating evaporation section in the longitudinal direction, each row of steam generating assembly comprising a plurality of up-and-down through smoke exhaust pipes arranged in sequence and spaced apart along the direction of high-temperature flue gas flow, and a steam generating jacket arranged around the smoke exhaust pipes, the top end of the smoke exhaust pipes extending into the smoke collecting cavity, and the bottom end hanging in the steam furnace body, and an inner-outer heating steam generating cavity being further formed between the steam generating jacket and the smoke exhaust pipes, all the steam generating cavities being sequentially and continuously connected in series, and the first steam generating cavity being further connected with the preheating pipe.

[0013] Further, the preheating pipe is provided with a plurality of groups corresponding to the steam generating assemblies, each group of preheating pipes comprising a plurality of pipes staggered in the transverse direction, the top of the preheating pipes in the same group being connected into the same collection communication pipe, and the collection communication pipe being connected with the first steam generating cavity in the steam generating assembly.

[0014] Further, the collection communication pipe is located in the smoke collecting cavity.

[0015] More specifically, a water level gauge is further arranged on the steam furnace body to monitor the water level in the preheating pipe, and in operation, the water level in the preheating pipe satisfies that the area exposed to the preheating section is always filled with water, and the water level is lower than the top of the preheating pipe. Exemplarily, the height of the cavity between the water level in the preheating pipe and the top end of the preheating pipe is 5 cm or more, preferably 5-20 cm, and optionally 10-15 cm. It should be noted here that the water level control logic in the utility model is that the height of the target water level is calculated according to the simulated evaporation amount, and then the power of the external water supply equipment and the burner is controlled to achieve synchronous balance, so as to ensure that the water level is constant at the set position, so as to stabilize the steam dryness and quality.

[0016] Further, a support plate located above the bottom is further fixedly installed in the steam furnace body, the smoke exhaust pipes are fixedly installed on the support plate, and the bottom end of the smoke exhaust pipes passes through the support plate and hangs above the bottom of the steam furnace body.

[0017] Further, the space above and below the support plate is connected with each other, so that after the high-temperature flue gas heats the steam generating cavities above the support plate, the flue gas can be discharged from the space below the support plate to the smoke collecting cavity through the smoke exhaust pipes.

[0018] Further, the upper and lower ends of adjacent two steam generating cavities are sequentially and staggered connected, forming a continuous serpentine steam generating channel.

[0019] Further, the steam generating assembly is provided with a plurality of parallel groups in the longitudinal direction.

[0020] Further, the material of the smoke exhaust tube and the steam generating jacket is boiler steel or commonly used boiler steel.

[0021] Further, the smoke collecting cavity is further connected with an external energy saver.

[0022] The utility model discloses a research, the reason of the tube of previous steam generator being easy to produce thermal fatigue damage lies in, the water inlet end of the lower end of the tube to the steam outlet end of the upper end is actually all in the roughly same heating environment, since the phase change enthalpy of water is higher, and compared with water vapor, the specific heat capacity of water is bigger, therefore, under the same heating environment, compared with the heating section of the tube (that is, the region closer to the water inlet end), the temperature rise of the evaporation section (that is, the region closer to the steam outlet end) inside mainly for water vapor is faster, and the range is bigger, thus, it is easy to cause thermal fatigue damage because of the temperature of the evaporation section region of the tube is too high, which undoubtedly seriously affects the service life of the evaporator etc.

[0023] Compared with the prior art, the utility model has the following advantages:

[0024] (1) by optimizing the heating layout of high-temperature flue gas, additionally arranging the preheating section of the preheating pipe before the heating evaporation section, on the one hand, can produce water vapor mixture of suitable temperature to facilitate the subsequent steam generating assembly to continue heating to produce saturated steam, on the other hand, more importantly, can absorb the heat of high-temperature flue gas, avoid the influence of the flue gas temperature being too high on the steam generating assembly in the heating evaporation section.

[0025] (2) the steam generating assembly adopts the critical horizontal transverse series layout, and is similar to the heating mode of the downflow, so that the temperature of the high-temperature flue gas for heating the steam cavity is matched with the water vapor state inside (that is, for the region with higher temperature, the fluid inside the steam cavity is mainly unvaporized water, and for the region with relatively lower temperature, the fluid inside the steam cavity is mainly vaporized water vapor), unlike conventional steam generators, the steam generator of the utility model can utilize the characteristic that the specific heat capacity of liquid water is much larger than that of water vapor, fully absorb the flue gas heat of the high-temperature region, and effectively control the temperature rise of the pipe wall, so that the thermal fatigue can be effectively reduced, and the durability can be improved.

[0026] (3) the flue gas is discharged through the smoke exhaust tube passing through the middle of the steam cavity, so that the flue gas can also heat the water vapor inside the steam cavity again during the discharging process, the limited equipment shape volume space is fully utilized to increase the heat exchange area, the "internal and external combined heating" mode makes up for the influence of the temperature difference gradient between the steam cavity and the flue gas on the heat transfer efficiency, improves the steam generating efficiency, and further fully utilizes the flue gas heat. Attached Figure Description

[0027] Fig. 1 This is a schematic diagram of the steam generating mechanism;

[0028] Fig. 2 A schematic diagram showing the cross-sectional view of the steam generating mechanism;

[0029] Fig. 3 This is a front view schematic diagram of the steam generating mechanism;

[0030] Explanation of markings in the diagram:

[0031] 1-Steam furnace body, 2-Smoke collection chamber, 3-Burner, 4-Preheating pipe, 5-Steam generating assembly, 6-Exhaust pipe, 7-Steam generating jacket, 8-Steam generating cavity, 9-Gathering connecting pipe, 10-Support plate, 11-Water level gauge. Detailed Implementation

[0032] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. This embodiment is based on the technical solution of the present invention and provides detailed implementation methods and specific operating procedures; however, the scope of protection of the present invention is not limited to the following embodiments.

[0033] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0034] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0035] Unless otherwise specified, the functional components or structures in the following embodiments or examples are conventional components or structures used in the art to achieve the corresponding functions.

[0036] In order to improve the steam generation efficiency of the steam generating mechanism, and improve the thermal fatigue problem, improve the durability, etc., the utility model provides a kind of horizontal straight flow type steam generating mechanism, its structure can refer to Figs. 1-3 As shown in the figure, comprising:

[0037] Steam furnace body 1, with hollow cavity, the hollow cavity is divided into preheating section and heating evaporation section in sequence along transverse communication;

[0038] Arranged in the smoke collecting cavity 2 of steam furnace body 1 top, for collecting from steam furnace body 1 exhaust flue gas;

[0039] Burner 3 is arranged in the hollow cavity near preheating section one end, for generating high-temperature flue gas for heating;

[0040] Preheating pipe 4 is arranged in the preheating section and bottom and external water supply pipeline is connected, for reducing the temperature of flue gas sent into heating evaporation section and generating preheated steam-water mixture;

[0041] Several rows of steam generating components 5 are arranged in the heating evaporation section along longitudinal direction, each row of steam generating component 5 includes several up and down through smoke row pipe 6 arranged in sequence along high-temperature flue gas flow direction and steam generating jacket 7 arranged around the smoke row pipe 6, the top end of the smoke row pipe 6 extends into the smoke collecting cavity 2, and the bottom end is suspended in the steam furnace body 1, the steam generating cavity 8 of internal and external heating is further formed between the steam generating jacket 7 and the smoke row pipe 6, all steam generating cavities 8 are sequentially connected in series, and the first one of the steam generating cavities 8 is also connected with the preheating pipe 4. In some specific embodiments, the preheating pipe 4 is provided with several groups one by one corresponding to steam generating component 5, each group of preheating pipe 4 includes several roots staggered along transverse direction, the top of the same group of preheating pipe 4 is connected to the same root of collection communication pipe 9, and the first steam generating cavity 8 in steam generating component 5 is connected through the collection communication pipe 9. In this way, the high-temperature flue gas just sent out from the burner 3 can play a full heat absorption effect, realize the preheating of water sent into the steam generating cavity 8, at the same time, the turbulent effect of subsequent entering heating evaporation section can be improved, the heating uniformity of the steam generating cavity 8 is improved, in addition, the temperature of flue gas sent into heating evaporation section is also reduced, to avoid the internal temperature of subsequent steam generating component 5 to rise too much.

[0042] In a more specific embodiment, the collecting communication pipe 9 is located in the smoke collecting cavity 2, and the heat of the flue gas in the smoke collecting cavity 2 can be further utilized. In addition, during operation, the water level in the preheating pipe 4 satisfies that the area exposed to the preheating section is always filled with water, and the water level is lower than the top of the preheating pipe 4. In this way, during operation, because the inside of the preheating pipe 4 exposed to the high-temperature flue gas part is all filled with water, the temperature of the pipe wall can be effectively reduced (generally, the temperature of the pipe wall can be maintained to be not higher than 200°C), so that the preheating pipe 4 is safer; at the same time, because the area of the preheating pipe 4 beyond the preheating section and lower than the top is a cavity, this part of the cavity can collect the heated water-steam mixture and send it to the subsequent steam production assembly 5. It should be pointed out that the height of the cavity formed by the water level in the preheating pipe 4 and the top is generally controlled to be about 10-15 cm, so that the heat can be fully utilized for preheating and the preheating pipe 4 can be protected, and at the same time, the amount of liquid water entering the subsequent steam production assembly 5 can be conveniently controlled, and then the steam quality can be conveniently controlled.

[0043] In a more specific embodiment, the preheating pipe 4 can be selected to be a smooth pipe (i.e., the outer surface is smooth and flat, and does not have fins or other pipe parts for increasing the heat dissipation area), so that the heat absorption of each preheating pipe 4 in the preheating section can be avoided to be too much, on the one hand, the state of the water-steam mixture formed by preheating can be conveniently controlled, and on the other hand, the temperature rise of each preheating pipe 4 can be avoided to be too large and easy to be damaged. In addition, in contrast, because the temperature of the high-temperature flue gas has been reduced after passing through the preheating section, when heating and evaporating, the temperature difference between the flue gas and the water-steam mixture in the steam production cavity 8 is relatively small, in order to ensure sufficient heat exchange rate, fins can be additionally arranged on the outside of the steam production jacket 7 to strengthen heat transfer.

[0044] In some specific embodiments, the steam furnace body 1 further fixedly has a support plate 10 located above the bottom, the smoke exhaust pipe 6 is fixedly arranged on the support plate 10, and the bottom end of the smoke exhaust pipe 6 penetrates through the support plate 10 and is suspended above the bottom of the steam furnace body 1. The support plate 10 can effectively fix and install the steam production assembly 5, and at the same time, the heating and evaporating section can be roughly divided into an upper space and a lower space (which are communicated with each other) to guide the flue gas to further heat and vaporize the steam production cavity 8 in the upper space, and then the flue gas is sent out from the lower space through the smoke exhaust pipe 6.

[0045] In a more specific embodiment, the space above and below the support plate 10 is communicated with each other, so that the high-temperature flue gas can heat each steam production cavity 8 in turn above the support plate 10 in the transverse direction, and then the flue gas is exhausted from the space below the support plate 10 through the smoke exhaust pipe 6 to the smoke collecting cavity 2.

[0046] In some specific implementations, the upper and lower ends of two adjacent steam-generating cavities 8 are staggered to form a continuous serpentine steam-generating channel. This can extend the path of water vapor being heated, improve heating efficiency, and also improve the uniformity of heating. In addition, it further improves the matching effect between the water vapor state inside the steam-generating cavity and the flue gas temperature, reducing the risk of thermal fatigue.

[0047] In some specific embodiments, the steam generating assembly 5 is provided with six, seven or more parallel groups along the longitudinal direction, depending on different requirements.

[0048] In some specific embodiments, the flue gas tube 6 and the steam jacket 7 are made of boiler steel, or other tubes commonly used in steam generators.

[0049] In some specific embodiments, the smoke collection chamber 2 is also connected to an external energy-saving device. The energy-saving device collects the flue gas and utilizes the waste heat before discharging it. It should be noted that the energy-saving device is a conventional component in a steam generator, and its function is to recover the waste heat of the exhaust gas. Since it is not an innovative point of this utility model, it will not be described in detail here.

[0050] Each of the above implementation methods can be implemented individually, or in any combination of two or more.

[0051] The above implementation methods will be described in more detail below with reference to specific embodiments.

[0052] Example 1:

[0053] To improve the steam generation efficiency of steam generating mechanisms, mitigate thermal fatigue, and enhance durability, this invention provides a horizontal direct-flow steam generating mechanism, the structure of which can be found in [reference needed]. Figs. 1-3 As shown, it includes:

[0054] The steam furnace body 1 has a hollow cavity, which is divided into a preheating section and a heating and evaporation section connected in sequence along the transverse direction;

[0055] The flue gas collection chamber 2, located at the top of the steam furnace body 1, is used to collect the flue gas discharged from the steam furnace body 1.

[0056] A burner 3 is located at one end of the hollow cavity near the preheating section, and is used to generate high-temperature flue gas for heating.

[0057] The preheating pipe 4, located within the preheating section and connected at its bottom to an external water supply pipeline, is used to reduce the temperature of the flue gas fed into the heating and evaporation section and to generate a preheated steam-water mixture.

[0058] A number of steam generating components 5 are arranged longitudinally within the heating and evaporation section. Each row of steam generating components 5 includes a number of vertically penetrating exhaust pipes 6 arranged sequentially at intervals along the high-temperature flue gas flow direction, and a steam generating jacket 7 arranged around the exhaust pipes 6. The top end of the exhaust pipes 6 extends into the smoke collection chamber 2, and the bottom end is suspended inside the steam furnace body 1. A steam generating cavity 8 with "internal and external heating" is also formed between the steam generating jacket 7 and the exhaust pipes 6. All steam generating cavities 8 are connected in series from end to end, and the steam generating cavity 8 located at the front is also connected to the preheating pipe 4.

[0059] Please see again. Fig. 1 As shown, there are 7 sets of preheating pipes 4 corresponding to the steam generating components 5. Each set of preheating pipes 4 includes two or three pipes arranged horizontally and staggered (more can be set as needed). The top of the preheating pipes 4 is connected to the same collecting and connecting pipe 9 located in the flue gas collection chamber 2, and is connected to the steam generating cavity 8 located at the front of the steam generating components 5 through the collecting and connecting pipe 9. Since the steam generating components 5 have seven columns arranged horizontally and six rows arranged horizontally in each set of steam generating components 5, in the preheating section, depending on the number of preheating pipes 4 in each set, all the preheating pipes 4 actually form two or three rows arranged horizontally and staggered. In this way, the high-temperature flue gas just sent from the burner 3 can be fully heat-absorbing, realizing the preheating of the water sent into the steam generating cavity 8. At the same time, it can also improve the turbulence effect of the subsequent entry into the heating and evaporation section, improve the heating uniformity of the steam generating cavity 8, and reduce the temperature of the flue gas sent into the heating and evaporation section, avoiding excessive temperature rise inside the subsequent steam generating components 5.

[0060] Since the collecting and connecting pipe 9 is located inside the flue gas collecting chamber 2, the waste heat of the flue gas inside the collecting chamber 2 can be further utilized. Additionally, it should be noted that during operation, the water level in the preheating pipe 4 meets the following requirements: the area exposed to the preheating section is always filled with water, and the water level is below the top of the preheating pipe 4. Thus, during operation, because the preheating pipe 4 exposed to the high-temperature flue gas is completely filled with water, the temperature of the pipe wall can be effectively reduced (generally maintaining the pipe wall temperature below 200℃), making the preheating pipe 4 safer. Simultaneously, since the area of ​​the preheating pipe 4 extending beyond the preheating section and below the top is a cavity, this cavity can collect the heated steam-water mixture and send it to the subsequent steam generation assembly 5. It should be noted that the height of the cavity formed by the water level in the preheating pipe 4 and the top is generally controlled at approximately 5 cm. This allows for full utilization of heat for preheating and protection of the preheating pipe 4, while also facilitating control of the amount of liquid water entering the subsequent steam generation assembly 5, thereby facilitating control of the produced steam quality. A support plate 10 is fixedly installed inside the steam furnace body 1, located above the bottom. The exhaust pipe 6 is fixedly installed on the support plate 10, with its bottom end passing through the support plate 10 and suspended above the bottom of the steam furnace body 1. The spaces above and below the support plate 10 are interconnected, allowing the high-temperature flue gas to heat the steam-generating cavity 8 above the support plate 10 before being discharged from the space below the support plate 10 through the exhaust pipe 6 into the smoke collection cavity 2. Here, the support plate 10 effectively fixes the steam-generating assembly 5 and also roughly separates the heating and evaporation section into an upper space and a lower space (which are connected), thus guiding the flue gas to first further heat and vaporize the steam-generating cavity 8 in the upper space before being discharged from the lower space through the exhaust pipe 6.

[0061] Please see again. Fig. 1 As shown, the upper and lower ends of two adjacent steam generating cavities 8 are staggered and connected in sequence to form a continuous serpentine steam generating channel. This can extend the path of water vapor being heated, improve heating efficiency, and also improve the uniformity of heating. In addition, it further improves the matching effect between the water vapor state and the flue gas temperature inside the steam generating cavity, reducing the risk of thermal fatigue.

[0062] The specific working process of the steam generating mechanism in this embodiment is as follows:

[0063] Raw water is supplied from an external water supply device to the preheating pipe 4 via a water supply pipeline, ensuring that the liquid level in the preheating pipe 4 is never lower than that in the preheating section. During operation, the burner 3 (planar type) generates high-temperature flue gas at a temperature of approximately 1100°C, which is then fed into the preheating section from the left end to heat the raw water in the preheating pipe 4. The boiling water-vapor mixture formed after the raw water is preheated is then fed into the first steam-generating cavity 8 in the heating and evaporation section via the upper collecting and connecting pipe 9. In the heating and evaporation section, the mixture is continuously heated by the cooled flue gas, causing the water-vapor mixture to continuously vaporize and heat up. In the last steam-generating cavity 8, high-temperature dry steam at a temperature of approximately 150-210°C is formed and then sent out via a steam pipeline. Meanwhile, the high-temperature flue gas flowing laterally along the heating and evaporation section continuously heats the fluid in the serpentine steam generation channel before being guided to the bottom of the exhaust pipe 6 in the space below the support plate 10. It then gathers in the exhaust chamber and is sent out. At the same time, during the process of being sent out from the exhaust pipe 6, the flue gas also heats the water vapor from inside the steam generation chamber, thereby greatly improving the heating efficiency of the water vapor inside the steam generation chamber.

[0064] Performance testing:

[0065] A steam generator was constructed according to the scheme of Example 1 and CN115451390A (as a control group), and the performance data are shown in Table 1 below.

[0066] Table 1

[0067]

[0068] As shown in the table above, this utility model optimizes the flow layout of high-temperature flue gas and, in conjunction with the exhaust pipe 6, achieves combined internal and external heating of water vapor. This allows for the output of more and more stable high-quality saturated steam with less natural gas consumption, effectively improving steam production efficiency and heat utilization.

[0069] Furthermore, temperature measurements were taken on the top sidewall of the last row (i.e., near the steam outlet) of the steam generating jacket 7, with a maximum temperature of approximately 230°C. In contrast, temperature measurements were taken on the upper sidewall of the tubes near the steam outlet in the steam generator of CN115451390A, with a maximum temperature reaching 300°C. It is evident that, comparatively, this application, by employing a horizontally aligned direct-flow heating layout, can achieve a match between the state of the heated flue gas and the heated fluid. This effectively avoids excessive heating of the heat exchange materials while maintaining stable and reliable saturated steam output, reducing the risk of thermal fatigue and improving durability.

[0070] The above description of the embodiments is provided to enable those skilled in the art to understand and use the utility model. It will be apparent to those skilled in the art that various modifications can be easily made to these embodiments, and the general principles described herein can be applied to other embodiments without inventive effort. Therefore, the present utility model is not limited to the above embodiments, and any improvements and modifications made by those skilled in the art based on the disclosure of the present utility model without departing from its scope should be within the protection scope of the present utility model.

Claims

1. A horizontal direct-flow steam generator, characterized in that, include: The steam furnace body has a hollow cavity, which is divided into a preheating section and a heating and evaporation section connected in sequence along the transverse direction; A flue gas collection chamber arranged at the top of the steam furnace body is used to collect the flue gas discharged from the steam furnace body; A burner located at one end of the hollow cavity near the preheating section is used to generate high-temperature flue gas for heating; The preheating pipe, located within the preheating section and connected at its bottom to an external water supply pipeline, is used to reduce the temperature of the flue gas fed into the heating and evaporation section and to generate a preheated steam-water mixture. Several rows of steam generating components are arranged longitudinally within the heating and evaporation section. Each row of steam generating components includes several vertically penetrating exhaust pipes arranged sequentially at intervals along the high-temperature flue gas flow direction, and a steam generating jacket arranged around the exhaust pipes. The top end of the exhaust pipes extends into the smoke collection chamber, and the bottom end is suspended inside the steam furnace body. A steam generating cavity with internal and external heating is also formed between the steam generating jacket and the exhaust pipes. All steam generating cavities are connected in series from end to end, and the steam generating cavity located at the front is also connected to the preheating pipe.

2. The horizontal direct-flow steam generator according to claim 1, characterized in that, The preheating pipes are provided in several groups corresponding to the steam generating components. Each group of preheating pipes includes several pipes that are intersected in the transverse direction. The tops of the preheating pipes in the same group are connected to the same connecting pipe and are connected to the steam generating cavity at the front of the steam generating component through the connecting pipe. The collecting and connecting pipe is located inside the smoke collection chamber.

3. A horizontal direct-flow steam generator according to claim 2, characterized in that, A water level gauge is also installed on the steam furnace body to monitor the water level in the preheating tube. During operation, the water level in the preheating tube meets the following requirements: the area exposed in the preheating section is always full of water, and the water level is lower than the top of the preheating tube.

4. A horizontal direct-flow steam generator according to claim 3, characterized in that, The height of the cavity between the water level in the preheating pipe and the top of the preheating pipe is more than 5 cm.

5. A horizontal direct-flow steam generator according to claim 1, characterized in that, The steam furnace body is also fixedly installed with a support plate located above the bottom. The exhaust pipe is fixedly installed on the support plate, and the bottom end of the exhaust pipe passes through the support plate and is suspended above the bottom of the steam furnace body.

6. A horizontal direct-flow steam generator according to claim 5, characterized in that, The spaces above and below the support plate are interconnected, allowing the high-temperature flue gas to heat the steam generation components above the support plate before being discharged from the space below the support plate through the exhaust pipe into the smoke collection chamber.

7. A horizontal direct-flow steam generator according to claim 1, characterized in that, The upper and lower ends of two adjacent steam-generating cavities are staggered and connected in sequence to form a continuous serpentine steam-generating channel.

8. A horizontal direct-flow steam generator according to claim 1, characterized in that, The preheating tube is a bare tube, and the outer side of the steam generating jacket is also provided with fins.

9. A horizontal direct-flow steam generator according to claim 1, characterized in that, The smoke collection chamber is also connected to an external energy-saving device.

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