Tubular energy-saving boiler

Abstract

The invention discloses a tubular energy-saving boiler which solves the problem that steam generated by an existing boiler is high in humidity. A gas burner is mounted in the hearth; a water collecting tank is arranged at the bottom of the hearth and is externally connected with a make-up pump; a space occupying rod is arranged in the heat exchange pipe, the evaporation box is located in the hearth, the water surface in the evaporation box is a steam-liquid interface, and saturated steam continuously enters the steam-water separation pipe. A bent pipe part is arranged in the steam-water separation pipe, a hole is formed in the low point of the bent pipe part, and the bent pipe part is connected back to the evaporation box through a return pipe for primary steam-water separation; a flow guide pipe is installed at the upper end opening of at least half of the steam-water separation pipe, steam is sprayed out at a high speed in the tangent and horizontal direction, vortex type steam is formed under guiding of the flow guide pipe, and secondary steam-water separation of the steam is achieved. When low-quality steam passing through the steam-water separation pipe passes through the structure, thermal movement of steam molecules enables the steam molecules to collide with one another, collide with the pipe wall, condense and the like to form mist-shaped micro water drops and flow back, and the steam quality of the boiler is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of steam boilers or steam generators, in particular to a cross-flow energy-saving boiler. Background Art

[0002] A tubular boiler, also known as a tubular steam generator, is a steam-generating device that uses natural gas as its combustion medium. This device generates a flame that heats water in the furnace tubes to a high temperature, producing saturated steam. Because the water is heated and flows through vertically arranged heat exchange tubes, generating saturated steam within the tubes, this type of device that heats water and generates steam is called a tubular boiler. Typically, a tubular boiler's effective water volume is less than 30 liters (to avoid safety hazards and eliminate the need for annual inspections).

[0003] During the research and development, we found the following technical problems that need to be solved urgently: First, the saturated steam produced by a tubular boiler contains too much water. In a tubular boiler, heat exchange tubes are typically arranged vertically within the boiler furnace. Dozens of these tubes are arranged in a circular pattern around the furnace cavity, forming a wall tube to facilitate efficient heat exchange with the high-temperature, high-pressure flames and flue gases generated by the combustion of the fuel. The upper and lower annular headers are connected by the central heat exchange tubes. Pure water enters the lower annular header and flows upward along the vertical tubes, exchanging heat with the flames on the outer tubes. In this environment, the gas flame heats the water within the tubes, generating saturated steam (a steam-water mixture) at the gas-liquid interface in the upper section of the tubes. In other words, the entire process of converting cold water to boiling water and generating steam occurs within the tubes. However, the limited horizontal cross-section (typically circular) of the tubes results in low steam generation efficiency.

[0004] Specifically, along the height of the heat exchange tube, from bottom to top, the tube can be functionally divided into a heating section, an evaporation section, and a superheating section. The heating section is located at the bottom, generally occupying 50% to 70% of the tube's length. Its function is to raise the temperature of the cold water (typically pure water) within the tube. The evaporation section, located in the upper middle portion of the heating section and generally 0.1 to 0.2 meters in height, evaporates the superheated hot water within the evaporation section, producing wet steam containing microscopic water droplets. The superheating section, located above the evaporation section, at the top of the heat exchange tube, generally occupies 20% to 30% of the tube's length. In the prior art, heat exchange tubes typically utilize straight stainless steel tubes of uniform diameter. To reduce the moisture content of the wet steam, a dehumidification component is typically installed within the tube to reduce the moisture content and produce the dryest, highest-quality steam possible. Regarding dehumidification components, the conventional design concept involves adding a dehumidification component within the heat exchange tube. For example, Chinese patent document CN114508745A discloses a cross-flow steam boiler characterized by a steam-water separation structure (i.e., a dehumidification component) disposed within at least one heat exchange tube at a position above 50% of the tube's height. The steam-water separation structure comprises a spiral plate disposed within the heat exchange tube and extending helically along the length of the tube, and / or an orifice plate with flow holes extending along the length of the tube, and / or baffles stacked and spaced apart along the length of the tube. The spiral plate defines a fluid flow path extending helically along the length of the tube. As saturated steam passes through the spiral space, liquid water is removed through collision with the tube wall, the spiral plate, orifice plate, and baffle, resulting in centrifugal, collision, deflection, and condensation, thereby producing high-quality steam with a relatively low water content. However, this technology also has its drawbacks. For example, the steam-water separator structure is fixed to the top of the heat exchange tube, making it difficult to secure by welding. Furthermore, the structure itself blocks the steam flow path, reducing evaporation efficiency. Furthermore, blockage can easily cause tube bursts. Furthermore, after installation, the steam-driven thrust forces the structure upward, potentially causing vibrations that can accelerate wear, detachment, and even damage to the heat exchange tubes.

[0005] Second, steam generation efficiency is relatively low. Within the furnace, the heat exchange tubes and annular headers are typically made of stainless steel, and the upper and lower ends of the heat exchange tubes are typically welded to the upper and lower annular headers. This approach limits the evaporation interface within the heat exchange tubes, preventing the water molecules within the tubes from efficiently and quickly generating steam. The reason is as follows: near the evaporation interface, as pure water continues to boil, the density of steam molecules increases. Due to the narrow liquid surface area of the heat exchange tubes, the conversion from liquid to vapor is limited. This means that the small cross-sectional area of the heat exchange tubes is a major factor in steam generation efficiency. In theory, increasing the diameter of the heat exchange tubes or increasing the number of heat exchange tubes can effectively increase steam production per unit time. However, simply increasing the size of the heat exchange tubes also creates another problem: it increases the internal volume of the boiler, pushing the equipment's specifications above 30 liters. (A boiler with an effective water volume of less than 30 liters does not qualify as special equipment and, according to current regulations, does not require regular annual inspections.) Therefore, there is an urgent need for technological innovations that can improve steam generation efficiency and speed without significantly increasing boiler volume.

[0006] Third, after the heat exchange tubes are welded, the welds between the heat exchange tubes and the annular headers are prone to deformation and bursting. After analysis, it was found that the upper and lower annular headers are mechanically fixed to the inside of the boiler, and the two ends of the heat exchange tubes are welded and fixed. When the heat exchange tubes switch between working and non-working states, thermal expansion and contraction occur, that is, the heat exchange tubes have dynamic changes in the length direction. This change will concentrate stress at the welding points at both ends of the heat exchange tubes, forming stress concentration and fatigue cracks. If this happens for a long time, it will easily cause welding failure and bursting at this point. This kind of bursting is fatal to a cross-flow boiler. Once a bursting occurs, it means the scrapping of the boiler furnace unit. Replacing a heat exchange tube alone is not feasible in actual operation, and usually the entire unit needs to be replaced. Therefore, there is a design flaw in directly setting the heat exchange tubes in a straight line from top to bottom.

[0007] Therefore, cross-flow steam boilers urgently need to improve their steam generation efficiency and quality. The simple design of their heat exchange tubes (straight tubes) has become a factor hindering the development of steam boilers. Therefore, how to solve these problems within the limited water volume specification range has become a scientific research task facing manufacturers. Summary of the Invention

[0008] In order to address the deficiencies of the prior art, the present invention provides a cross-flow energy-saving boiler, which is a new design that takes into account both steam quality and the service life of heat exchange tubes. Through the innovative design of the core heat exchange components, the problems of high steam humidity and low quality in existing cross-flow boilers are solved.

[0009] The technical solution adopted by the present invention to solve the technical problem is: A cross-flow energy-saving boiler, in which the effective water volume in the boiler is less than 30 liters in working state, comprises a gas heating assembly, an exhaust gas treatment component and a water supply pump, and is characterized in that: a gas burner is installed in the furnace of the gas heating assembly, and further comprises a water collecting box, a heat exchange tube, an evaporation box, a steam-water separation tube and a steam collecting box arranged around the gas burner and passing through from bottom to top, wherein the water collecting box is arranged at the bottom of the furnace; a placeholder rod is arranged in the vertically arranged heat exchange tube, the placeholder rod is eccentrically installed in the heat exchange tube and forms a liquid water channel between the heat exchange tube and the placeholder rod, the horizontal section of the liquid water channel is an eccentric ring, and the eccentric ring is eccentrically arranged in a direction away from the center axis of the furnace as the origin, under the continuous heating action of the gas burner, the water temperature in the heat exchange tube gradually increases from bottom to top, and the water at the top of the heat exchange tube and in the evaporation box is in a boiling state; The evaporation box is located at a height of 60% to 80% of the furnace height, and the water surface in the evaporation box is a vapor-liquid separation interface, and the surface area of the vapor-liquid separation interface is at least twice the sum of the horizontal cross-sectional areas of all heat exchange tubes. Under the continuous heating of the gas burner, saturated steam is continuously generated at the vapor-liquid separation interface, and the saturated steam continuously enters the steam-water separation pipe; the steam-water separation pipe is arranged between the evaporation box and the steam collecting box, and a bend portion for separating water from the saturated steam is provided in the steam-water separation pipe, the bend portion has two turning points, one high and one low, and an opening is provided at the lowest position of the turning point of the low point and is connected back to the evaporation box through a return pipe at the opening, the return pipe extends vertically downward and below the water surface level in the evaporation box to achieve a single steam-water separation; at least one An L-shaped guide pipe is installed on the upper port of the semi-steam-water separation pipe, one end of the guide pipe is mechanically fixed to the top of the steam-water separation pipe, and the outlet of the other end is directed to the annular steam collecting space and is arranged along the tangential direction of the steam collecting space. The steam is ejected at high speed along the tangential and horizontal direction, and forms vortex steam under the guidance of the guide pipe, thereby realizing secondary steam-water separation of the steam. The separated condensate flows back to the evaporation box through the steam-water separation pipe and the return pipe without the guide pipe installed; the flue gas channel in the exhaust gas treatment component is connected to the flue in the furnace through the laterally arranged smoke exhaust window hole, and a preheated water pipe is arranged in the flue gas channel, which is connected to the water collecting tank through a make-up water pump, and the make-up water pump supplies water to the gas heating assembly and keeps the vapor-liquid separation interface in the evaporation box stable.

[0010] Furthermore, a boiling stop net is provided inside the evaporator, and the boiling stop net is provided at the vapor-liquid separation interface. Its function is to eliminate the large splashes generated by boiling high-temperature water, thereby reducing the water content of the liquid entering the next pipeline and improving the quality of the steam.

[0011] Furthermore, an expansion joint is provided in the upper middle section of the steam-water separation tube. The expansion joint refers to an enlarged structure. The presence of the expansion joint can eliminate the thermal expansion and contraction of the heat exchange tube and the steam-water separation tube during the start-stop switching process of the boiler.

[0012] Furthermore, the number of expansion joints can be multiple. The expansion joint is arranged in the steam section, does not occupy the temporary water storage space of pure water, and solves the fatigue damage problem of welding points caused by thermal expansion and contraction.

[0013] Furthermore, a horizontally arranged metal mesh or mesh plate is provided in the steam collecting space to increase the collision with the steam and realize the separation of the water contained in the steam during the collision process.

[0014] Furthermore, a heat-gathering baffle is provided in the furnace, and the heat-gathering baffle is located outside the heat exchange tube and maintains a distance of 1 cm to 5 cm from the heat exchange tube. The function of the heat-gathering baffle is to reflect the heat radiation generated by heating, and a reinforcement cylinder is provided on the outer side of the heat-gathering baffle. The reinforcement cylinder and the heat-gathering baffle are spot-welded and reinforced to form a whole. Hollow smoke exhaust holes are provided on the heat-gathering baffle and the reinforcement cylinder to improve the rigidity of the heat-gathering baffle, which has positive significance for the shape stability of the heat-gathering baffle under high temperature conditions.

[0015] Furthermore, it comprises a refractory furnace plate, which forms an annular high-temperature flue gas channel between the refractory furnace plate and the heat-collecting baffle, and forms a closed air insulation cavity between the refractory furnace plate and the furnace shell.

[0016] Furthermore, the arrangement relationship between the guide pipe and the steam-water separation pipe is: one is set at every interval.

[0017] Furthermore, the bend is an S-tube or Z-tube with two bends, and the upper end of the bend is connected to the steam collecting box through a vertically arranged straight pipe to transport the dehumidified steam upward.

[0018] Furthermore, the return pipe and the placeholder rod are welded and fixed to form a whole, and the lower end of the return pipe is located in the heat exchange tube, and a return hole is set at the low point of the return pipe to realize the replenishment of condensed water separated from wet steam to the evaporator or the heat exchange tube.

[0019] Furthermore, it also includes a liquid level monitoring component installed outside the furnace, which is connected to the water collecting tank and the steam collecting tank through a pipeline interface. The vapor-liquid separation interface in the evaporation tank is quantitatively set and monitored by the externally arranged liquid level monitoring component. After the setting, the height of the vapor-liquid separation interface is basically stable.

[0020] Furthermore, the inner surface of the steam-water separation tube has a coating with a rough surface structure. The presence of the coating can increase the collision area between the steam and the tube wall, thereby further improving the steam-water separation effect.

[0021] Furthermore, a placeholder is provided in the water storage space in the water collecting tank, and the function of the placeholder is to occupy a certain space, reduce the amount of water stored in the water collecting tank, and reduce the tonnage data of the boiler. When the water collecting tank is designed to be relatively flat, the placeholder is omitted.

[0022] Furthermore, the upper port of the heat exchange tube and the lower port of the steam-water separation tube are staggered, thereby preventing the boiling water in the heat exchange tube from flowing directly toward the lower port of the steam-water separation tube, optimizing the steam path, and allowing part of the liquid water to fall back to the evaporator, avoiding excessive liquid water from being added.

[0023] Furthermore, the surface of the placeholder rod is pressed with a concave-convex structure, such as a concave-convex pattern, which further increases the turbulence effect of the pure water in the heat exchange tube, so that the pure water generates a turbulent effect along the direction of gravity, thereby improving the heating efficiency.

[0024] Furthermore, the cross-flow energy-saving boiler is equipped with a PLC electronic control system and touch screen control.

[0025] The beneficial effects of the present invention are: After implementing this technology, the heat exchange tubes rapidly heat the cold water, eliminating the need for evaporation. Instead, a large evaporation area is created within the evaporator. Because the water surface area within the evaporator is several times (at least twice) the total area of the heat exchange tubes, and the depth of the boiling pure water within the evaporator is controlled between 1 and 2 centimeters, the increased water volume can be compensated by spacers. Due to the continuous boiling process, water molecules will pass through the boiling water interface (critical point) and enter the upper vapor space, becoming steam molecules. Since the evaporation rate is proportional to the area of the evaporating water surface, this facilitates the rapid and large-scale formation of saturated steam, significantly increasing steam production. The saturated steam, driven by steam lift, enters the steam-water separator tube for initial dehumidification. The separated water returns to the evaporator, where it enters the steam collection box above, forming a cyclone or steam vortex within its inner cavity for further dehumidification. Excess water droplets flow back through the steam-water separator tube to the evaporator, ultimately producing high-quality steam with a relatively low water content.

[0026] This technology optimizes the specific structure of the steam-water separation tube, so that when low-quality steam passes through the tube, the thermal motion of the steam molecules will cause them to collide with each other, collide with the tube wall, condense, and form mist-like micro-water droplets, which then flow back. All of this is done inside the boiler, improving the quality of the boiler's steam output.

[0027] The steam-water separation tube in this technology does not have complex baffles / spiral baffles or other structures that hinder the passage of steam, and there is no obvious necking space, which is conducive to keeping the steam channel unobstructed.

[0028] This technology, by setting a guide tube in the steam collector, makes the internal steam in a vortex or cyclone state and generates centrifugal force. Under the action of centrifugal force, the moisture content in the steam is further reduced, thereby effectively improving the quality of the steam.

[0029] This technology, by adding placeholder rods in the heat exchange tubes, reduces the volume of water in the tubes while ensuring that the heat exchange tubes have the same heat absorption surface area, thereby reducing the water volume in the boiler, ensuring that the water volume in the boiler is less than 30L.

[0030] This technology solves the problem of fatigue damage at the welding points at both ends of the heat exchange tube caused by thermal expansion and contraction by arranging an expansion joint on the steam-water separation tube. In addition, the expansion joint in this technology is arranged on the steam-water separation tube instead of on the heat exchange tube, and does not occupy the volume index of the boiler.

[0031] The return pipe in this technology is smaller in size and shorter in length, and its lower end is inserted below the liquid level in the evaporator, which can quickly return the liquid water separated by the steam-water separation pipe to the evaporator.

[0032] The boiler equipment produced by this technology has a water volume of less than 30L and is not considered special equipment, so a certified boiler operator is not required. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 This is a front view of the boiler, showing the touch screen configuration location.

[0034] Figure 2 for Figure 1 A--A sectional view.

[0035] Figure 3 for Figure 1 A top view showing the configuration of the two gas heating assemblies.

[0036] Figure 4 This is a three-dimensional image of the gas heating assembly, showing an oblique upward perspective.

[0037] Figure 5 A perspective view of the gas heating assembly, showing a downward angle.

[0038] Figure 6 This is a horizontal cross-sectional view of the gas heating assembly and exhaust gas treatment components, showing the internal space division of the furnace.

[0039] Figure 7It shows the composition of the internal heat exchange components of the gas heating assembly, a three-dimensional perspective.

[0040] Figure 8 Shows the composition of the gas heating assembly, vertical cross-section perspective.

[0041] Figure 9 for Figure 8 A magnified view of the part at point B.

[0042] Figure 10 for Figure 8 A partial enlarged view of point C in the middle.

[0043] Figure 11 for Figure 8 A partial enlarged view of point D in the middle.

[0044] Figure 12 for Figure 10 Another alternative to this is shown, which omits the placeholder.

[0045] Figure 13 for Figure 11 An alternative solution is shown, which shows the setting solution of the expansion joint.

[0046] Figure 14 The partial structure of the steam collecting box is shown.

[0047] Figure 15 for Figure 14 Top view of .

[0048] Figure 16 This is a three-dimensional diagram of the flow guide tube.

[0049] Figure 17 A partial view of the heat exchange tube and steam box configuration is shown.

[0050] Figure 18 The horizontal cross-sectional area comparison between the steam box and the heat exchange tube is shown. The ratio of the evaporation area is approximately 4:1.

[0051] Figure 19 This is a demonstration of the structural style of the through-flow channel. In the figure, the lower end of the return pipe is located below the liquid level of the steam box.

[0052] Figure 20 The structural style of the through-flow channel is demonstrated, showing the structure of the double S-shaped bend pipe part.

[0053] Figure 21 The PLC control touch screen interface of this boiler is demonstrated.

[0054] In the picture: 100, gas heating assembly; 110, furnace; 111, furnace shell; 112, smoke exhaust window; 120, gas burner; 121, fan; 130, heat exchange tube; 131, placeholder rod; 132, liquid water channel; 140, water collecting tank; 141, water storage space; 142, placeholder; 150, evaporation tank; 151, boiling stop screen; 160, steam-water separator; 161, elbow; 162, straight pipe; 163, return pipe; 164, return hole; 165, expansion joint; 166, guide pipe; 170, collector Steam box; 171. Steam outlet; 172. Steam pressure relief valve; 173. Liquid level interface; 174. Steam collecting space; 175. Grid plate; 180. Heat collecting baffle; 181. Reinforced cylinder; 182. Refractory furnace plate; 183. High-temperature flue gas channel; 184. Air insulation cavity; 190. Liquid level monitoring component; 200. Sheet metal shell; 210. Steam valve; 220. Steam pressure relief valve; 300. Touch screen; 400. Make-up water pump; 500. Exhaust gas treatment component; 510. Flue gas channel; 520. Preheating water pipe. DETAILED DESCRIPTION

[0055] refer to Figures 1 to 3 A cross-flow energy-saving boiler comprises two gas heating assemblies 100, a water supply pump 400, an exhaust gas treatment unit 500, and a PLC control system. These assemblies are fixedly mounted within a sheet metal housing 200, which preferably has a specific geometric shape. This regular rectangular parallelepiped shape facilitates transportation, hoisting, and rapid deployment of the boiler equipment.

[0056] This boiler is controlled by PLC electronic control technology and equipped with touch screen 300. The touch screen 300 of the control system is referenced Figure 21 .

[0057] Water quality affects the thermal efficiency and service life of pipelines. Untreated water has a high hardness and contains solid particles and dissolved gases, which can easily cause scaling and corrosion. This boiler uses pure water treated with an RO membrane reverse osmosis pure water processor and a deaerator (not shown). Water sampling ports are installed in the water pipelines as needed to facilitate water quality testing before startup. Water quality must meet the standards of GB1576, "Industrial Boiler Water Quality," of the People's Republic of China.

[0058] refer to Figure 4 and Figure 5The gas heating assembly 100 includes a furnace 110, functional components installed inside the furnace 110, and a liquid level monitoring component 190 installed outside the furnace 110, wherein the furnace 110 is provided with a gas burner 120, a heat exchange tube 130, a water collecting box 140, an evaporation box 150, a steam-water separation pipe 160, a steam collecting box 170 and a heat collecting baffle 180, and the furnace shell 111 adopts a composite structure of stainless steel and refractory heat-insulating material, wherein the refractory heat-insulating material is adhered to the inner surface of the furnace 110 to form a furnace 110 structure with fire resistance and heat insulation. Through the combination of the above multiple components, a specific technical effect is formed (the technical effect is detailed in the following section).

[0059] Furthermore, the furnace shell 111 is preferably a cylindrical stainless steel shell with a top and bottom plate, welded together and provided with a layer of refractory insulation material. The bottom plate of the furnace shell 111 is provided with a mounting window for the gas burner 120. In other words, the gas burner 120 within the furnace 110 provides a heat source by burning upward and sideways. A smoke exhaust window 112 is provided on the side of the furnace shell 111. This window 112 is rectangular or circular and located on the side. An exhaust gas treatment assembly 500 is installed outside this window 112. This exhaust gas treatment assembly 500 includes a flue gas duct 510 and a preheated water pipe 520 disposed within the flue gas duct 510. The preheated water pipe 520 is arranged in a U-shaped, circuitous arrangement within the flue gas duct 510. As the cold water in the pipe passes through the preheated water pipe 520, it exchanges heat with the high-temperature flue gas within the flue gas duct 510. The outer end of the preheated water pipe 520 is connected to a make-up water pump 400, which replenishes water to the boiler. Simultaneously, as the external cold water passes through the preheated water pipe 520 within the flue gas duct 510, it exchanges heat with the high-temperature exhaust gas, preheating the incoming water for utilization, reducing energy consumption and serving as an energy-saving technology. The preheated warm water enters the boiler, specifically, the water collection tank 140 within the boiler.

[0060] Furthermore, the boiler water in this technology adopts pure water. The so-called pure water in this embodiment refers to: softened pure water that has undergone nanofiltration and deoxygenation.

[0061] refer to Figure 6 Furthermore, a heat collecting baffle 180 is provided in the furnace 110. The inner side of the heat collecting baffle 180 is the combustion chamber of the furnace 110, which is the heat exchange place between flame and water. The outline of the heat collecting baffle 180 is designed according to the shape of the heat exchange tube 130, the evaporation box 150, and the steam-water separation tube 160, and an appropriate distance is maintained between the heat exchange tube 130, the evaporation box 150, and the steam-water separation tube 160, and the distance is between 1 cm and 5 cm. The function of the heat collecting baffle 180 is to generate heat radiation for reflection.

[0062] Additionally, the inner surface of the heat collecting baffle 180 is provided with a mirror coating, which can improve the efficiency of heat reflection.

[0063] Furthermore, the above-mentioned heat collection baffle 180 is divided into three sections, namely, upper, middle and lower sections, wherein a smoke exhaust hole is provided in the upper and lower ranges of one-third of the distance from the top / bottom to the middle section. The smoke exhaust hole covers at least the evaporation box 150 and the bottom of the steam-water separation tube 160, the top of the heat exchange tube 130 and other parts. The smoke exhaust hole is a circular hole array arranged in the following pattern: the aperture is large near the evaporation box 150, and the aperture size gradually decreases upward and downward. This arrangement allows the high-temperature flue gas to diffuse preferentially from outside the covered area, so that the high point is in the high-temperature area, which improves the local problem of the evaporation box 150. Under the same combustion conditions, the evaporation box 150 can obtain more heat energy, thereby generating higher heat exchange efficiency and increasing the steam production per unit time, which is of positive significance for improving the utilization efficiency of thermal energy.

[0064] Furthermore, a reinforcing cylinder 181 is provided on the outer side of the heat collecting baffle 180, and the reinforcing cylinder 181 and the heat collecting baffle 180 are spot-welded and reinforced to form a whole, so as to improve the rigidity of the heat collecting baffle 180, which is of positive significance for the shape stability of the heat collecting baffle 180 under high temperature conditions.

[0065] Furthermore, a circular, concentrically arranged refractory hearth plate 182 is positioned approximately 20-30 cm outside the heat-collecting baffle 180. This refractory hearth plate 182 forms an annular high-temperature flue gas passage 183 with the heat-collecting baffle 180, and a sealed air insulation cavity 184 with the outer shell of the furnace 110. The aforementioned refractory insulation material is bonded to the inner wall of the outer shell. This arrangement of refractory hearth plate 182, air insulation cavity 184, and refractory insulation material optimizes the thermal insulation performance of the furnace 110.

[0066] Furthermore, the heat collecting baffle 180, the reinforcement cylinder 181, and the refractory furnace plate 182 are preferably made of an alloy material resistant to the temperature of the gas flame, such as a chromium / nickel high-temperature resistant plate. Hollow structures are provided on the heat collecting baffle 180 and the reinforcement cylinder 181 to allow the flue gas to pass through.

[0067] Furthermore, the high-temperature exhaust gas such as flue gas generated by the above-mentioned gas burner 120 is discharged through the only exhaust gas treatment component 500, and is preheated with cold water during the discharge process to achieve the purpose of energy saving. The inner wall of the exhaust gas treatment component 500 is also treated with refractory insulation materials.

[0068] The following sections will provide a detailed description of the heat exchange assembly consisting of the heat exchange tube 130, water collecting tank 140, evaporation tank 150, steam-water separation tube 160, and steam collecting tank 170 in the present invention. This section is also the essence of the present invention.

[0069] In this boiler, the water collection tank 140, evaporation tank 150, and steam collection tank 170 are a single, annular stainless steel box with an annular cavity formed within. The water collection tank 140 is located on the bottom plate of the furnace 110 and is mechanically fixed, such as by bolts. The steam collection tank 170 is located on the top plate of the furnace 110 and is fixed. The evaporation tank 150 is located in the upper-middle portion of the furnace 110, optimally positioned at the highest point of the flame. Numerous heat exchange tubes 130 connect the evaporation tank 150 and the water collection tank 140 in a continuous mechanical connection. Liquid water is heated between the water collection tank 140 and the evaporation tank 150 until it boils. Based on the physical properties of heated water, boiling water appears in the top portion of the evaporation tank 150. Once the hot water reaches the evaporation tank 150 from the heat exchange tubes 130, the evaporation area increases significantly. Liquid level control technology maintains a substantially constant liquid level within the evaporation tank 150. The evaporator tank 150 and the steam collection tank 170 above it are mechanically connected via numerous steam-water separation tubes 160. This creates a completely continuous passageway between the water collection tank 140, heat exchange tubes 130, evaporator tank 150, steam-water separation tubes 160, and steam collection tank 170, forming the heat exchange core of the tubular boiler. The detailed structure of each component is described below.

[0070] The technical effect of this technology is that the arc-shaped heat exchange surface area of the heat exchange tube 130 is large, which can achieve rapid heat exchange. At the same time, the evaporation area in the evaporator box 150 is large, which achieves large-volume evaporation, solves the technical problem of small evaporation volume in the traditional heat exchange tube 130, and creatively achieves the goal of rapid heating and large-scale evaporation.

[0071] Furthermore, the vertical cross-section of the evaporation box 150 is rectangular or circular. This embodiment shows a rectangular cross-section, which is convenient for opening holes and welding and fixing with the heat exchange tube 130.

[0072] The gas burner 120 is installed in the center of the inner cavity of the furnace 110 formed by the heat exchange tubes 130 to heat the surrounding heat exchange tubes 130 / evaporation box 150, etc. The gas pressure (dynamic pressure) used by the gas burner 120 is 3kPa to 8kPa, and the fuel is standard natural gas, and the calorific value of the gas should be 6500kcal / Nm³ to 8500kcal / Nm³.

[0073] The heat exchange tube 130 in this technology serves as the main place for heating water, which heats cold water to boiling water. In addition, the heat exchange tube 130, placeholder rod 131, etc. in this technology realize a small space for the water channel, reducing the water volume of the boiler and meeting the national requirement of less than 30L.

[0074] The evaporator box 150 of this technology is disposed on top of the heat exchange tubes 130. Its function is to receive boiling water from the heat exchange tubes 130, which can greatly increase the surface area of the vapor-liquid separation interface. That is, the boiling water in the evaporator box 150 is in a continuous boiling state, which is more than twice the surface area of the vapor-liquid separation interface within the traditional straight tube 162 (the larger the horizontal cross-section of the evaporator box 150, the better the evaporation rate). After implementation of this embodiment, its evaporation rate can reach over 1000 kilograms per hour, which is characterized by high steam generation efficiency.

[0075] Figure 17 and Figure 18 A comparative diagram shows the area comparison of the gas-liquid separation interface before and after the improvement, wherein the ratio of the surface area of the gas-liquid separation interface before and after the improvement is 1:4. Correspondingly, through the implementation of the placeholder rod 131, the speed of generating hot water in the heat exchange tube 130 can be increased, realizing the unification of rapid heat exchange and large-scale steam generation.

[0076] Furthermore, a boiling-stop net 151 is provided inside the above-mentioned evaporation box 150. The so-called boiling-stop net 151 is a functional component, which is arranged at the steam-liquid water separation surface (referred to as the vapor-liquid separation interface). Its function is to eliminate the large splashes generated by boiling high-temperature water, thereby reducing the water content of the steam entering the next pipeline and improving the quality of the steam.

[0077] Furthermore, the boiling stop net 151 is preferably a 304 stainless steel net, or a stainless steel mesh plate 175, and is fixed by spot welding or clamping. Figure 11 .

[0078] The above-mentioned boiling-stop net 151 is an optional configuration, and whether it is set or not is within the scope of protection of the present invention.

[0079] The vapor-liquid separation interface within the evaporation tank 150 (located roughly overlapping with the anti-boiling screen 151) is quantitatively set and monitored by a liquid level monitoring component 190 disposed externally to the boiler. Once set, the height of the vapor-liquid separation interface remains substantially stable and remains constant within the evaporation tank 150. Setting and controlling the vapor-liquid separation interface within a steam boiler is conventional technology in existing boilers and will not be further elaborated.

[0080] refer to Figure 6Multiple heat exchange tubes 130 are arranged around the gas burner 120 and enclose a heat exchange wall within the boiler furnace 110. In this embodiment, the heat exchange tubes 130 are preferably 304 stainless steel tubes. The heat exchange tubes 130 are vertically arranged, with liquid water channels inside. These heat exchange tubes 130 serve only as channels for heating the water, and the vapor-liquid separation interface is not within the heat exchange tubes 130, thus eliminating the evaporation effect of the heat exchange tubes 130. Preferably, the heat exchange tubes 130 are enclosed and arranged in a circular array, with their interior spaces serving as combustion chambers for the gas. The flames generated by the combustion of the gas heat the heat tubes. To increase the heating area of the heat exchange tubes 130, an appropriate spacing is maintained between adjacent heat exchange tubes 130, for example, a gap of 1-10 mm between adjacent heat exchange tubes 130. This gap allows the flame or heat radiation from the flame to surround and more evenly affect the outer wall of the heat exchange tubes 130. Even so, in practice, the heat exchange tube 130 wall facing the flame receives much greater heat than the wall facing away from the flame. That is, with the center of the flame as the origin, the heat exchange tube 130 is not heated uniformly. Relatively speaking, the wall facing the flame side of the heat exchange tube 130 heats up faster. This drawback exists in conventional steam boilers. To address this issue, this embodiment incorporates the following design.

[0081] refer to Figure 17 In the embodiment, a placeholder rod 131 is provided in the heat exchange tube 130 and is passed through from top to bottom. The presence of the placeholder rod 131 makes the liquid water channel 132 inside the heat exchange tube 130 form a ring shape, that is, a ring-shaped liquid water channel 132 is formed in the heat exchange tube 130.

[0082] Furthermore, the placeholder rod 131 is a hollow stainless steel rod made of the same material as the heat exchange tube 130. The placeholder rod 131 is eccentrically positioned within the heat exchange tube 130. This eccentric placement of the placeholder rod 131 forms an eccentric ring within the internal liquid water channel 132, and the eccentric placement is oriented away from the central axis of the furnace 110. This arrangement precisely addresses the characteristics of the heat exchange tube 130, which receives greater heat and heats up faster on the side facing the flame. That is, the side with greater heat radiation also has greater water volume, making fuller use of the heat radiation distribution characteristics within the furnace 110. This allows the cold water in the liquid water channel 132 to heat up more evenly, improving the heating rate and effectiveness.

[0083] In an illustrated embodiment, the upper end of the placeholder rod 131 is integrated with the reflux pipe 163 in the steam-water separation pipe 160 .

[0084] In a modified embodiment, the placeholder rod 131 exists independently, with its lower end fixed to the water collecting tank 140 and its upper end abutting against the return pipe 163 .

[0085] In a modified embodiment, an auxiliary support protrusion is welded to the outer side of the placeholder rod 131, so that the placeholder rod 131 can be independently filled in the interior of the heat exchange tube 130 to form a placeholder space.

[0086] In this embodiment, the steam-water separation tube 160 is arranged between the evaporator 150 and the steam collecting box 170. The purpose and function of the steam-water separation tube 160 is to separate the water in the wet steam, improve the steam dryness, and ensure the steam quality. The high-quality steam after steam-water separation continues to flow upward into the steam collecting box 170, and the separated liquid water enters the heat exchange tube 130 or the steam box again through the return pipe 163, which solves the problem of wet steam being pushed to the top of the steam collecting box 170 under the action of air pressure in traditional technology, thereby improving the steam quality.

[0087] refer to Figure 11 and Figure 13 From a spatial perspective, the steam-water separation tube 160 includes a central curved section 161. This curved section 161 is an S-shaped or Z-shaped tube. Its lower end is directly or indirectly welded to the evaporation tank 150, penetrating the evaporation tank 150. The upper end of the curved section 161 is connected to the steam collection tank 170 via a vertically arranged straight tube 162, transporting the dehumidified steam upward. A small hole is formed at the lowest point of the curved section 161, and a return pipe 163 is welded to the hole. This return pipe 163 extends vertically downward, passes through the tank wall, enters the evaporation tank 150, and is inserted below the liquid level. Depending on the insertion depth, the lower end of the return pipe 163 can be located within the heat exchange tube 130 or the evaporation tank 150. A reflux hole 164 is provided at the low point of the reflux pipe 163 . The reflux hole 164 must be ensured to be located below the liquid water surface. The insertion depth can be designed and calculated based on data as needed to ensure that the condensed water separated from the wet steam is replenished into the evaporator 150 or the heat exchange tube 130 .

[0088] Specifically, the bend 161 has two bends. The first bend changes the steam channel from obliquely upward to obliquely downward, which is a sharp turn greater than 270 degrees. The second bend changes from obliquely downward to obliquely upward or straight upward, which is also a sharp bend greater than 270 degrees. Through the setting of these two bends, the steam forms a violent impact in the bend 161, separating the water contained in the saturated steam.

[0089] Furthermore, the return pipe 163 and the placeholder rod 131 are fixed by welding to form a whole.

[0090] Furthermore, the above-mentioned curved pipe portion 161 includes at least two styles, referring to Figure 19 and Figure 20 .

[0091] The above-mentioned steam-water separation tubes 160 are arranged evenly and equidistantly in the circumferential direction and have reasonable gaps. Under the action of the flame, the steam-water separation tubes 160 are in a high-temperature state, further heating the steam in the tube, and most of the condensate beads separated in this process are dried to achieve steam drying, thereby improving the quality of the steam.

[0092] Furthermore, the inner surface of the steam-water separation tube 160 has a coating with a rough surface structure. The presence of the coating can increase the collision area between the steam and the tube wall, thereby further improving the steam-water separation effect.

[0093] Furthermore, an expansion joint 165 is provided in the middle and upper section of the steam-water separation pipe 160, that is, a section of the straight pipe 162 near the steam collecting box 170. Figure 13 The expansion joint 165 is an enlarged structure that eliminates thermal expansion and contraction of the heat exchange tube 130 and the steam-water separation tube 160 during boiler startup and shutdown. In this embodiment, multiple expansion joints 165 can be provided. Positioned in the steam section, the expansion joint 165 does not occupy temporary pure water storage space and mitigates fatigue damage to welds caused by thermal expansion and contraction.

[0094] The steam-water separation process and principle of the wet steam in the steam-water separation pipe 160 are as follows: After the wet steam rushes up from the above-mentioned evaporation box 150, it will quickly form a bend greater than 270 degrees due to the bending and tortuosity of the pipe at the bend portion 161. During this process, the wet steam collides violently with the inner wall of the pipe, causing the water to partially condense on the pipe wall and flow and gather downward along the inclined pipe portion. At the same time, the wet steam collides with the protrusions on the rough surface of the pipe wall, further improving the effect of steam-water thermal separation and realizing the discharge of the water generated by the steam-water separation to the evaporation box 150, thereby obtaining high-quality steam with a relatively low water content.

[0095] The steam collecting box 170 is an annular stainless steel box structure with an annular interior space for receiving high-quality steam from the steam-water separation tube 160. Specifically, the top of the steam collecting box 170 is provided with multiple pipe interfaces and welded with multiple flanged pipes. For example, in this embodiment, three flanged pipes are shown: one flanged pipe is a steam outlet 171, equipped with a steam valve 210; another is a steam pressure relief port 172, equipped with a steam pressure relief valve 220; and the third is a liquid level interface 173, connected to and equipped with a liquid level monitoring component 190. The upper end of the steam-water separation tube 160 is inserted into the steam collecting box 170, and the upper ends of the numerous steam-water separation tubes 160 are evenly arranged along the steam collecting box 170.

[0096] At the port of the steam-water separation pipe 160 in the steam collecting box 170, a plurality of guide pipes 166 are selectively installed. The guide pipe 166 is L-shaped, one end of which is inserted into the top port of the steam-water separation pipe 160, and the other end is directed toward the annular steam collecting space 174 and is roughly arranged along the tangent direction β of the steam collecting space 174. Figure 15 In this embodiment, the arrangement relationship between the guide pipe 166 and the above-mentioned steam-water separation pipe 160 is that one is set every interval. Figure 15 The technical advantages of this setting are as follows: After the steam emerges from the steam-water separation tube 160, it is ejected at high speed in a generally tangential and horizontal direction under the action of the above-mentioned guide tube 166. The numerous guide tubes 166 form a vortex of steam. In other words, the steam forms a high-speed vortex within the steam collecting cavity, thereby further separating the water inside the steam. The separated water then flows back to the evaporator 150 through other steam-water separation tubes 160 that are not equipped with the guide tube 166.

[0097] Furthermore, at least one portion of the top of the steam-water separation pipe 160 is not provided with the guide pipe 166 , so that the water generated in the steam collecting tank 170 can smoothly flow back to the return pipe 163 .

[0098] Furthermore, a horizontally arranged metal mesh or mesh plate 175 is also provided in the above-mentioned steam collecting space 174, and its function is to increase the collision with the steam and realize the separation of the water contained in the steam during the collision process.

[0099] The guide pipe 166 is fixed at the pipe opening of the steam-water separation pipe 160 by means of expansion.

[0100] The water collecting tank 140 is located at the bottom of the furnace 110, and has a cold water flange interface and a liquid level monitoring interface. The water collecting tank 140 has an annular water storage space 141, and two C-shaped placeholders 142 are installed in the water storage space 141. The placeholders 142 are hollow stainless steel boxes, fixed in the middle and lower position, and avoid the open part of the lower end of the heat exchange tube 130. The pure water from the above-mentioned cold water flange interface (from the water supply pump 400) has a water distribution function in the water storage space, that is, the cold water or preheated water from the cold water flange interface is replenished to each heat exchange tube 130.

[0101] The placeholder 142 is used to occupy a certain amount of space, reducing the amount of water stored in the water collection tank 140 and reducing the tonnage of the boiler, which is beneficial for achieving the design goal of less than 30 L. When the water collection tank 140 is designed to be relatively flat, the placeholder 142 is omitted.

[0102] The temperature of the pure water in the heat exchange tubes 130 gradually increases from bottom to top, and the pure water is boiling at the top, especially near the evaporator 150. The vapor-liquid separation interface within the evaporator 150 has a larger surface area than the total cross-sectional area of the heat exchange tubes 130 (the area is doubled). The evaporator 150's larger heated surface area contributes to the technical benefits of this technology, particularly a significant increase in evaporation yield for heat exchange tubes 130 of the same specifications. Furthermore, the placement of the steam-water separation tube 160 and the optimized orientation of the flow guide 166 improve steam dryness.

[0103] Furthermore, the upper end of the heat exchange tube 130 and the lower end of the steam-water separation tube 160 in this embodiment are staggered, thereby preventing the boiling water in the heat exchange tube 130 from flowing directly toward the lower end of the steam-water separation tube 160, thereby optimizing the steam path.

[0104] Furthermore, the surface of the placeholder rod 131 is pressed with a concave-convex structure, such as a concave-convex pattern, which further increases the turbulence effect of the pure water in the heat exchange tube 130, so that the pure water generates a turbulence effect along the direction of gravity, thereby improving the heating efficiency.

[0105] Furthermore, suitable refractory insulation materials are provided on the top and the floor of the furnace 110 .

[0106] Furthermore, the gas burner 120 in this embodiment is a tubular burner that extends from the bottom of the furnace 110 housing into the combustion chamber. Its outer end is connected to a fan 121, a gas pipe, and a mixer, generating a flame, thereby heating the furnace 110. The gas burner 120 is a purchased accessory and is conventionally described.

[0107] In this embodiment, preliminarily preheated cold water enters from the bottom, and high-temperature steam is discharged at the top. In the process from bottom to top, the water is heated and the steam is generated and dried, forming a steam boiler with a cross-flow structure. The pure water in all the heat exchange tubes 130 is uniformly distributed by the water collecting tank 140 below, and the principle of communicating vessels is used to have the same liquid level.

[0108] It should be noted that the boiler needs to use pure water as a water source to effectively prevent scaling inside the heat exchange tubes 130 and the like.

[0109] In this embodiment, the number of the heat exchange tubes 130 is between 30 and 50, for example, 36.

[0110] Furthermore, the evaporation box 150 is an annular component made of 304 stainless steel by welding, and has an annular evaporation chamber composed of side plates and top and bottom plates. The chamber has a gas-liquid evaporation interface. Holes are opened on the bottom and top plates of the evaporation box 150 for installing the heat exchange tube 130 and the vapor-liquid separation tube.

[0111] In this embodiment, after steam is generated, it is in a saturated state within evaporation tank 150, meaning that the steam within evaporation tank 150 has a relatively high water content. The present invention, through the design and use of a vapor-liquid separation tube, separates most of the condensed water from the saturated steam, generating high-quality steam. This steam is then further dehumidified in steam collection tank 170, resulting in high-quality steam with a relatively low water content.

[0112] In fact, the saturated steam that has undergone the above-mentioned dehumidification treatment still carries some water when entering the annular header at the top. Therefore, a tangentially arranged guide pipe 166 structure is usually still designed in the annular header at the top to form a cyclone or vortex. For example, a grid plate 175 is set in the annular header to perform vapor-liquid separation and obtain high-quality steam as much as possible.

[0113] Despite this, in theory, the steam obtained through the boiler still contains water, but the goal is to obtain high-quality steam with a low water content as much as possible. The lower the water content of the steam coming out of the boiler, the less workload the subsequent external steam-water separator will have, and the more energy-efficient it will be. Therefore, the water content of the steam directly coming out of the boiler is an important data indicator of a cross-flow boiler. The lower the water content of the steam, the more energy-efficient it will be.

[0114] Liquid level monitoring component 190, connected to water collection tank 140 and steam collection tank 170, monitors the vapor-liquid separation interface within furnace 110. It uses electrode-based liquid level monitoring for level control and alarms, and incorporates a glass observation window for manual monitoring. When the liquid level rises above or falls below a set height, the system automatically triggers a low-level alarm.

[0115] In this embodiment, the water level in the boiler is realized by an automatic water supply control system, which combines intermittent water supply level control and alarm. Boiler water replenishment is an existing mature technology and will not be described in detail.

[0116] Furthermore, a smoke temperature sensor is installed in the smoke exhaust channel to monitor the exhaust temperature. The exhaust temperature monitoring is achieved through the equipment control system. Under normal circumstances, the exhaust temperature of this equipment is less than 65°C. If the exhaust temperature value is abnormal, the furnace needs to be shut down for inspection.

[0117] This boiler spray is equipped with a pressure gauge and a pressure controller, which cooperates with PLC control technology to realize intelligent control, including water pressure monitoring and steam pressure monitoring. To ensure the accuracy of the pressure gauge, it should be calibrated at least once every six months.

[0118] Regularly check the sensitivity and reliability of the pressure controller. Normally, the operator can preliminarily determine the reliability of the pressure controller by comparing the set pressure of the start and stop burner of the pressure controller with the controller display data.

[0119] A drain pipe and drain valve are also connected to the bottom of the water collection tank 140. This is because the filtered pure water may contain minerals. When the feed water enters the equipment and is heated and vaporized, these substances will precipitate. When the boiler water is concentrated to a certain level, these substances will settle in the boiler, forming a small amount of scale. The greater the evaporation rate and the longer the continuous operation, the more deposits there will be. To prevent boiler accidents caused by scale and slag, a drain valve (not shown) is installed.

[0120] The embodiments described above are merely descriptions of preferred implementations of the present invention and are not intended to limit the scope of the present invention. Without departing from the spirit of the present invention, various modifications and improvements to the present invention made by relevant technical personnel in this field should fall within the scope of protection determined by the claims of the present invention.

Claims

1. A cross-flow energy-saving boiler, comprising a gas heating assembly, an exhaust gas treatment component and a water supply pump, characterized in that: The gas heating assembly has a gas burner installed in the furnace, and also includes a water collecting box, a heat exchange tube, an evaporation box, a steam-water separation tube and a steam collecting box arranged around the gas burner and passing through from bottom to top, wherein, The water collecting tank is arranged at the bottom of the furnace and is externally connected to a water supply pump; A placeholder rod is provided in the vertically arranged heat exchange tube. The placeholder rod is eccentrically installed in the heat exchange tube so that a liquid water channel is formed between the heat exchange tube and the placeholder rod. The horizontal section of the liquid water channel is an eccentric ring, and the eccentric ring is eccentrically arranged away from the center axis of the furnace. Under the continuous heating action of the gas burner, the temperature of the water in the heat exchange tube gradually increases from the bottom to the top, and the water at the top of the heat exchange tube and even in the evaporation box is in a boiling state. The evaporation box is located at a height of 60% to 80% of the furnace height, and the water surface in the evaporation box serves as a vapor-liquid separation interface. The surface area of the vapor-liquid separation interface is at least twice the sum of the horizontal cross-sectional areas of all heat exchange tubes. Under continuous heating by the gas burner, saturated steam is continuously generated at the vapor-liquid separation interface, and the saturated steam continuously enters the steam-water separation tube. The steam-water separation pipe is arranged between the evaporation tank and the steam collecting tank. The steam-water separation pipe is provided with a curved pipe portion for separating water from the saturated steam. The curved pipe portion has two turning points, one high and one low. An opening is provided at the lowest position of the turning point of the low point and is connected back to the evaporation tank through a return pipe at the opening. The return pipe extends vertically downward and below the water level in the evaporation tank to achieve primary steam-water separation. At least half of the upper ports of the steam-water separation tubes are equipped with L-shaped guide tubes. One end of the guide tube is mechanically fixed to the top of the steam-water separation tube, and the other end faces into the annular steam collecting space and is arranged along the tangent direction of the steam collecting space. Steam is ejected at high speed along the tangential and horizontal direction and forms a vortex steam under the guidance of the guide tube, achieving secondary steam-water separation. The separated condensate is returned to the evaporation tank through the steam-water separation tube without the guide tube and the return pipe; The flue gas channel in the exhaust gas treatment component is connected to the flue in the furnace through a laterally arranged smoke exhaust window hole, and a preheated water pipe is arranged in the flue gas channel. The preheated water pipe is connected to the water collecting tank through a water supply pump, and the water supply pump supplies water to the gas heating assembly and keeps the vapor-liquid separation interface in the evaporation box constant.

2. A cross-flow energy-saving boiler according to claim 1, characterized in that: A boiling-stop net is arranged inside the evaporation box, and the boiling-stop net is arranged at the vapor-liquid separation interface.

3. The cross-flow energy-saving boiler according to claim 1, characterized in that: An expansion joint is provided in the upper middle section of the steam-water separation tube, and the expansion joint compensates for the thermal expansion and contraction of the heat exchange tube and the steam-water separation tube.

4. The cross-flow energy-saving boiler according to claim 1, characterized in that: A horizontally arranged metal mesh or grid plate is arranged in the steam collecting space.

5. The cross-flow energy-saving boiler according to claim 1, characterized in that: A heat collecting baffle is provided in the furnace, and the heat collecting baffle is located outside the heat exchange tube and maintains a distance of 1 cm to 5 cm from the heat exchange tube. A reinforcement cylinder is provided on the outer side of the heat collecting baffle, and hollow smoke exhaust holes are provided on the heat collecting baffle and the reinforcement cylinder.

6. The cross-flow energy-saving boiler according to claim 1, characterized in that: It also includes a refractory hearth plate, an annular high-temperature flue gas channel is formed between the refractory hearth plate and the heat-collecting baffle, and an air insulation cavity is formed between the refractory hearth plate and the hearth shell.

7. The cross-flow energy-saving boiler according to claim 1, characterized in that: The arrangement relationship between the guide pipe and the steam-water separation pipe is: one is set at every interval.

8. The cross-flow energy-saving boiler according to claim 1, characterized in that: The curved pipe portion is an S-tube or a Z-tube with two folds.

9. The cross-flow energy-saving boiler according to claim 1, characterized in that: The return pipe is fixed to the placeholder rod by welding, and the lower end of the return pipe is located in the heat exchange tube, and a return hole is set at the low point of the return pipe, and the condensed water separated from the saturated steam is replenished into the evaporator or the heat exchange tube.

10. The cross-flow energy-saving boiler according to claim 1, characterized in that: It also includes a liquid level monitoring component installed outside the furnace, which is connected to the water collecting tank and the steam collecting tank through a pipeline interface. The vapor-liquid separation interface in the evaporation tank is quantitatively set and monitored by the externally arranged liquid level monitoring component.

11. The cross-flow energy-saving boiler according to claim 1, characterized in that: The inner surface of the steam-water separation tube is provided with a coating with a rough surface structure, and the surface of the placeholder rod is pressed with a concave-convex structure.

12. The cross-flow energy-saving boiler according to claim 1, wherein the upper end of the heat exchange tube and the lower end of the steam-water separation tube are staggered.

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