Energy-saving boiler of through-flow type

Abstract

The application discloses a through-flow energy-saving boiler, which solves the problem of high steam humidity of the existing boiler. A gas burner is installed in a hearth, a water collecting tank is arranged at the bottom of the hearth and is externally connected with a water supplement pump; a space-occupying rod is arranged in a heat exchange pipe, the evaporation tank is located in the hearth, the water surface in the evaporation tank is a vapor-liquid interface, and saturated steam continuously enters a steam-water separation pipe; a bend pipe part is arranged in the steam-water separation pipe, the low point of the bend pipe part is perforated and is connected to the evaporation tank through a backflow pipe, and primary steam-water separation is realized; at least half of the upper ports of the steam-water separation pipe are provided with flow guide pipes, steam is high-speed sprayed along a tangent and horizontal direction, and the steam forms vortex steam under the guidance of the flow guide pipes, so that secondary steam-water separation is realized. When low-quality steam passing through the steam-water separation pipe passes through the structure, the thermal motion of steam molecules will make them collide with each other, collide with the pipe wall, condense and the like to form misty micro water droplets and backflow, so that the steam quality of the boiler is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of steam boiler or steam generator, in particular to a through-flow energy-saving boiler. BACKGROUND

[0002] The through-flow boiler, also known as through-flow steam generator, its core structure is a steam generating device taking natural gas as the combustion medium, that is, a device for generating flame by combustion and heating water in the wall pipe to high temperature until saturated steam is generated. Because the water is heated and flows in the vertically arranged heat exchange pipe, and saturated steam is generated in the pipe, this device for heating water and generating steam is called "through-flow boiler". The effective water volume of the through-flow boiler usually reaches the technical index of less than 30 liters (no safety hazard, no need for regular annual inspection).

[0003] In the research and development, the following technical problems are found to be urgently solved:

[0004] Firstly, the saturated steam generated by the through-flow boiler contains too much water. In the through-flow boiler, the heat exchange pipe is usually vertically arranged in the boiler furnace, and a large number of (hundreds of) heat exchange pipes are arranged in a ring shape along the inner cavity of the furnace to form a wall pipe, so as to fully exchange heat with the high-temperature and high-pressure flame and flue gas generated by fuel combustion. The upper and lower two annular headers are connected by the intermediate heat exchange pipe, pure water enters from the lower annular header, flows upwards along the vertical heat exchange pipe, and is heated by the flame outside the heat exchange pipe. In this environment, the pure water in the pipe is heated by the flame of the gas, and saturated steam (steam-water mixture) is generated at the gas-liquid interface in the upper section of the heat exchange pipe, that is, the whole process of changing pure water into boiling water and generating steam is completed in the heat exchange pipe. However, the limited physical structure of the horizontal cross section (generally circular) of the heat exchange pipe makes its steam generation efficiency low.

[0005] Further, along the height direction of the heat exchange pipe, the heat exchange pipe can be further divided into a heating section, an evaporation section and a superheating section from bottom to top according to functions, wherein the heating section is located at the lower part and generally accounts for 50% to 70% of the length of the heat exchange pipe, and the function of the heating section is to heat the cold water (generally pure water) in the pipe. The evaporation section is located in the middle and upper part of the heating section, and the height is generally 0.1 to 0.2 meters. In the evaporation section, the overheated hot water evaporates and generates wet steam containing micro water droplets. The superheating section is located in the upper part of the evaporation section and the top of the heat exchange pipe, and generally accounts for 20% to 30% of the length of the heat exchange pipe. In the prior art, generally, the heat exchange pipe adopts a stainless steel straight pipe with equal diameter. In order to reduce the water content of the wet steam, a dehumidifying functional part is usually arranged here, that is, the water content in the wet steam is reduced to obtain high-quality steam as dry as possible. Regarding the dehumidifying part, the conventional design concept is to increase the dehumidifying functional part in the heat exchange pipe. For example, a tubular steam boiler is disclosed in Chinese patent document CN114508745A. The characteristic of this boiler is that the inside of at least one heat exchange pipe is provided with a steam-water separation structure (i.e. a dehumidifying part) at a position above 50% of the height of the heat exchange pipe; the steam-water separation structure includes a spiral plate arranged in the heat exchange pipe and spirally extended along the length direction of the heat exchange pipe, and / or a hole plate provided with flow holes penetrating along the length direction of the heat exchange pipe, and / or a baffle arranged in layers and spaced apart along the length direction of the heat exchange pipe; wherein the spiral plate defines a fluid flow path spirally extended along the length direction of the heat exchange pipe. When the saturated steam passes through the spiral space, the purpose of removing liquid water is achieved through the processes of collision, centrifugation, collision, change of direction, condensation, etc. with the pipe wall and the spiral plate, hole plate and baffle, so as to obtain high-quality steam with relatively low water content. However, this technology also has its drawbacks, for example, the steam-water separation structure is fixed at the top of the heat exchange pipe and is not suitable for welding and fixing, and the steam-water separation structure itself will block the steam path, causing a decrease in evaporation efficiency, and at the same time, when blockage occurs here, pipe explosion is easy to occur. At the same time, after installation of the steam-water separation structure, under the action of the steam thrust, the steam-water separation structure has a tendency to move upward, therefore, vibration is possible, which will accelerate the wear and tear of the heat exchange pipe, fall off and even damage.

[0006] Secondly, the steam generation efficiency is relatively low. Inside the furnace, the heat exchange tubes and annular headers are generally made of stainless steel, and the upper and lower ends of the heat exchange tubes are typically connected to the upper and lower annular headers by welding. This method limits the evaporation interface within the heat exchange tubes, preventing water molecules inside from effectively and quickly forming steam in large quantities. The reason is as follows: near the evaporation interface, as pure water continues to boil, the density of steam molecules in the space continuously increases. Due to the small liquid surface area of ​​the heat exchange tubes, the conversion from liquid to vapor state is limited, which is one of the main factors affecting steam generation efficiency when the heat exchange tube cross-section is small. Theoretically, increasing the diameter of the heat exchange tubes or increasing the number of heat exchange tubes can effectively increase the steam output per unit time. However, simply increasing the size of the heat exchange tubes also brings another problem: it increases the internal volume of the boiler, causing the equipment's specifications to exceed 30L (a boiler with an effective water volume of less than 30 liters is not considered special equipment and, according to current regulations, does not require regular annual inspection). Therefore, there is an urgent need for a technological innovation that can improve steam generation efficiency and speed without significantly increasing the boiler volume.

[0007] Thirdly, after welding the heat exchanger tubes, the weld joint between the heat exchanger tubes and the annular header is prone to deformation and tube rupture. Analysis revealed that the upper and lower annular headers are mechanically fixed inside the boiler, while the heat exchanger tubes are welded at both ends. During the switching between working and non-working states, thermal expansion and contraction occur, meaning the heat exchanger tubes undergo dynamic changes along their length. This change concentrates stress at the weld joints at both ends of the heat exchanger tubes, leading to stress concentration and fatigue cracks. Over time, this can easily result in weld failure and tube rupture. Such tube rupture is fatal for once-through boilers; once it occurs, it means the boiler furnace unit is unusable. Replacing a single heat exchanger tube is impractical in practice; usually, the entire unit needs to be replaced. Therefore, directly using a single, vertically arranged heat exchanger tube from top to bottom is a design flaw.

[0008] Therefore, for once-through steam boilers, there is an urgent need to improve their steam generation efficiency and the quality of the steam produced. The simple design of their heat exchange tubes (straight tubes) has become a limiting factor in the development of steam boilers. Therefore, how to solve these problems within the limited water volume is a research task facing manufacturers. Summary of the Invention

[0009] To address the shortcomings of existing technologies, this invention provides a once-through energy-saving boiler, which is a novel design that balances steam quality and heat exchange tube lifespan. Through innovative design of the core heat exchange components, it solves the problems of high steam humidity and low steam quality in existing once-through boilers.

[0010] The technical solution adopted by this invention to solve its technical problem is as follows:

[0011] The application discloses a through-flow energy-saving boiler, which is characterized by the following technical scheme: a gas burner is arranged in a hearth of a gas heating assembly; a water collecting tank, a heat exchange pipe, an evaporation tank, a steam-water separation pipe and a steam collecting tank are arranged in sequence and vertically around the gas burner; the water collecting tank is arranged at the bottom of the hearth; a space occupying rod is arranged in the heat exchange pipe in a vertical mode, the space occupying rod is arranged in the heat exchange pipe in an eccentric mode and a liquid water channel is formed between the heat exchange pipe and the space occupying rod, the horizontal section of the liquid water channel is an eccentric ring, and the eccentric ring is arranged in an eccentric mode away from the center axis of the hearth; under the continuous heating of the gas burner, the water temperature in the heat exchange pipe gradually increases from bottom to top, and the water at the top end of the heat exchange pipe is in a boiling state in the evaporation tank; the evaporation tank is arranged at a position with a height of 60% to 80% of the hearth, and a water surface in the evaporation tank is a steam-liquid separation interface, and the surface area of the steam-liquid separation interface is at least twice the sum of the horizontal section areas of all the heat exchange pipes; under the continuous heating of the gas burner, saturated steam is continuously generated at the steam-liquid separation interface and enters the steam-water separation pipe; the steam-water separation pipe is arranged between the evaporation tank and the steam collecting tank, a bend pipe part for separating water in the saturated steam is arranged in the steam-water separation pipe, the bend pipe part has two turning points with one high and one low, an opening is arranged at the lowest position of the low turning point, and a backflow pipe is connected to the evaporation tank through the opening; the backflow pipe vertically extends downwards and extends to below the water level in the evaporation tank, so that primary steam-water separation is realized; L-shaped flow guide pipes are arranged on at least half of the upper ends of the steam-water separation pipes, one end of the flow guide pipe is mechanically fixed at the top end of the steam-water separation pipe, and the other end of the flow guide pipe is arranged in the steam collecting space in a tangential direction of the steam collecting space, so that steam is sprayed in a high speed along the tangential direction and forms vortex steam under the guidance of the flow guide pipe, secondary steam-water separation is realized, and separated condensed water is returned to the evaporation tank through the steam-water separation pipes without the flow guide pipes and the backflow pipe; a flue gas channel in a tail gas treatment assembly is connected to a flue in the hearth through a laterally arranged smoke exhaust window, a preheating water pipe is arranged in the flue gas channel, the preheating water pipe is connected to the water collecting tank through a water supplementing pump, and the water supplementing pump supplies water for the gas heating assembly and keeps the steam-liquid separation interface in the evaporation tank stable.

[0012] Further, a boiling prevention net is arranged in the evaporation tank and arranged at the steam-liquid separation interface, which can eliminate water splashes generated by high temperature water in a boiling state, so that the water content of liquid entering the next pipeline is reduced and the quality of steam is improved.

[0013] Further, an expansion joint is arranged in the upper section of the steam-water separation pipe, which is a structure with expansion, and the presence of the expansion joint can eliminate the thermal expansion and contraction of the heat exchange pipe and the steam-water separation pipe during the start-stop conversion of the boiler.

[0014] Further, the expansion joint can be multiple. The expansion joint is arranged in the steam section, does not occupy the temporary water storage space of the pure water, and solves the problem of fatigue damage of the welding point caused by thermal expansion and contraction.

[0015] Further, a metal mesh or grid plate is arranged in the steam collection space, which increases the collision with steam and separates the water contained in the steam during the collision.

[0016] Further, a heat collecting baffle is arranged in the furnace, and the heat collecting baffle is located outside the heat exchange pipe and maintains a distance of 1-5 cm from the heat exchange pipe. The heat collecting baffle reflects the heat radiation generated by heating, and a reinforcing cylinder is arranged outside the heat collecting baffle. The reinforcing cylinder and the heat collecting baffle are spot-welded to form a whole. The heat collecting baffle and the reinforcing cylinder are provided with a hollow smoke exhaust hole, so as to improve the rigidity of the heat collecting baffle, which has a positive significance for the shape stability of the heat collecting baffle under high temperature.

[0017] Further, a refractory furnace plate is arranged, which forms an annular high-temperature flue gas channel between the heat collecting baffle and the furnace shell, and forms a closed air insulation cavity between the furnace shell.

[0018] Further, the arrangement relationship between the flow guide pipe and the steam-water separation pipe is that one is arranged every interval.

[0019] Further, the elbow pipe part is an S pipe or a Z pipe with two turns. The upper end of the elbow pipe part is connected to the steam collection tank through a vertically arranged straight pipe, and the dehumidified steam is transported upward.

[0020] Further, the return pipe and the spacer rod are welded and fixed to form a whole, and the lower end of the return pipe is located in the heat exchange pipe. A return hole is arranged at the low point of the return pipe to realize the return of the condensed water separated from the wet steam to the evaporation tank or the heat exchange pipe.

[0021] Further, a liquid level monitoring component is arranged outside the furnace, which is connected to the water collection tank and the steam collection 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 setting, the height of the vapor-liquid separation interface is basically stable.

[0022] Further, the inner surface of the steam-water separation pipe has a coating with a rough surface structure, and the coating can increase the impact area of steam and the pipe wall, thereby further improving the steam-water separation effect.

[0023] Further, a space-occupying body is arranged in the water storage space in the header tank, and the space-occupying body occupies a certain space, reduces the amount of water stored in the header tank, and reduces the tonnage data of the boiler.

[0024] Further, the upper port of the heat exchange pipe is staggered with the lower port of the steam-water separation pipe, so that the boiling water in the heat exchange pipe is not directly directed to the lower port of the steam-water separation pipe, the steam path is optimized, part of the liquid water falls back to the evaporation tank, and excessive liquid water is avoided.

[0025] Further, the surface of the space-occupying rod is pressed and has a concave-convex structure, for example, a concave-convex pattern, which further increases the turbulent effect of pure water in the heat exchange pipe, so that the pure water generates a turbulent effect along the gravity direction, and the heating efficiency is improved.

[0026] Further, the tubular energy-saving boiler is provided with a PLC electric control system and a touch screen control.

[0027] The beneficial effects of the present application are:

[0028] After the implementation of the present technology, the heat exchange pipe is used for rapidly heating cold water, and no longer provides an evaporation site. Instead, a large evaporation area is formed in the evaporation tank. Since the water surface area in the evaporation tank is several times (at least twice) the total area of the heat exchange pipe, and the depth of the boiling pure water in the evaporation tank is controlled to be between 1 and 2 cm, the water volume increase can be compensated by the space-occupying rod. Due to the continuous boiling state, water molecules will enter the upper steam space in large quantities through the boiling water interface (critical), becoming steam molecules. Since the evaporation amount is proportional to the area of the evaporation surface, a large amount of saturated steam can be formed quickly, and the steam quantity is significantly improved. The saturated steam will enter the steam-water separation pipe under the action of steam lift, and the separated water will return to the evaporation tank. The separated steam will enter the upper steam collection tank and form a cyclone or steam vortex in the inner cavity, and then be dehumidified again. Excess water droplets will be returned to the evaporation tank through the steam-water separation pipe, and finally high-quality steam with low water content will be obtained.

[0029] The present technology optimizes the specific structure of the steam-water separation pipe, so that the low-quality steam passing through the steam-water separation pipe will collide with each other, collide with the pipe wall, condense, and form misty micro water droplets and backflow when passing through the structure. These are all completed inside the boiler, which improves the quality of the steam output by the boiler.

[0030] There is no complex baffle / helical baffle structure in the steam-water separation tube in the present technology to hinder the passage of steam, and there is no obvious necking space, which is conducive to keeping the steam passage unobstructed.

[0031] The present technology, by arranging a flow guide pipe in the steam collection, makes the internal steam in a vortex or cyclone state, and generates centrifugal force, which further reduces the water content in the steam, thereby effectively improving the quality of the steam.

[0032] The present technology, by additionally arranging a space-occupying rod in the heat exchange pipe, reduces the volume of water in the pipe while ensuring that the heat exchange pipe has the same heat absorption surface area, thereby reducing the water volume in the boiler and ensuring that the water volume in the boiler is less than 30L.

[0033] The present technology solves the problem of fatigue failure of the welding points at both ends of the heat exchange pipe caused by thermal expansion and cold contraction by arranging an expansion joint on the steam-water separation pipe, and the expansion joint in the present technology is arranged on the steam-water separation pipe rather than on the heat exchange pipe, which does not occupy the volume index of the boiler.

[0034] The return pipe in the present technology is smaller in size and shorter in length, and the lower end is inserted below the liquid level in the evaporation tank, which can quickly return the liquid water separated by the steam-water separation pipe to the evaporation tank.

[0035] The boiler equipment produced by the present technology has a water volume of less than 30L, which does not belong to special equipment, and does not require a certified boiler worker. BRIEF DESCRIPTION OF DRAWINGS

[0036] Figure 1 It is a front view of the present boiler, showing the configuration position of the touch screen.

[0037] Figure 2 It is Figure 1 A sectional view along A--A.

[0038] Figure 3 It is Figure 1 A top view, showing the configuration of two groups of gas heating assemblies.

[0039] Figure 4 It is a perspective view of the gas heating assembly, showing an oblique upper view.

[0040] Figure 5 It is a perspective view of the gas heating assembly, showing an oblique lower view.

[0041] Figure 6 It is a horizontal position sectional view of the gas heating assembly and the tail gas treatment assembly, showing the internal space division of the hearth.

[0042] Figure 7The composition of the heat exchange component inside the gas heating assembly is shown, and the perspective view.

[0043] Figure 8 The composition of the gas heating assembly is shown, and the vertical cross-sectional view.

[0044] Figure 9 For Figure 8 The partial enlarged view at B.

[0045] Figure 10 For Figure 8 The partial enlarged view at C.

[0046] Figure 11 For Figure 8 The partial enlarged view at D.

[0047] Figure 12 For Figure 10 Another alternative to the composition of the gas heating assembly is shown, which omits the placeholder.

[0048] Figure 13 For Figure 11 Another alternative to the composition of the gas heating assembly is shown, which omits the placeholder.

[0049] Figure 14 The partial structure of the steam collection box is shown.

[0050] Figure 15 For Figure 14 The plan view.

[0051] Figure 16 The perspective view of the flow guide pipe.

[0052] Figure 17 The configuration of the heat exchange pipe and the steam collection box is shown, and the partial view is shown.

[0053] Figure 18 The horizontal cross-sectional area comparison of the steam collection box and the heat exchange pipe is shown, and the evaporation area ratio is about 4:1.

[0054] Figure 19 The structure of the cross-flow channel is shown, and the lower end of the return pipe is below the liquid level of the steam collection box.

[0055] Figure 20 The structure of the cross-flow channel is shown, and the structure of the double S-shaped elbow pipe is shown.

[0056] Figure 21 The PLC control touch screen interface of the boiler is shown.

[0057] In the figure:

[0058] 100, gas heating assembly; 110, furnace; 111, furnace shell; 112, smoke exhaust window; 120, gas burner; 121, fan; 130, heat exchange pipe; 131, space-occupying rod; 132, liquid water passage; 140, water collecting tank; 141, water storage space; 142, space-occupying body; 150, evaporation tank; 151, boiling-stopping net; 160, steam-water separation pipe; 161, elbow pipe part; 162, straight pipe; 163, return pipe; 164, return hole; 165, expansion joint; 166, flow guide pipe; 170, steam collecting tank; 171, steam outlet; 172, steam pressure relief port; 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 passage; 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, water replenishing pump; 500, tail gas treatment assembly; 510, flue gas passage; 520, preheating water pipe. DETAILED DESCRIPTION

[0059] REFERENCE Figures 1 to 3 A tubular energy-saving boiler, which has two groups of gas heating assemblies 100, a water replenishing pump 400, a tail gas treatment assembly 500, and a PLC control system, the assemblies are fixedly installed in a sheet metal shell 200, which preferably has a specific geometric shape. The regular shape of the cuboid is conducive to the transportation, hoisting and rapid deployment of the boiler equipment.

[0060] The boiler is controlled by a PLC electric control technology, and is configured with a touch screen 300, the touch screen 300 of the control system is referred to Figure 21 .

[0061] The quality of water will affect the thermal efficiency and service life of the pipeline, untreated water has high hardness, contains solid particles and dissolved gas, and is easy to cause scaling, corrosion, etc. The boiler uses RO membrane reverse osmosis pure water processor and deaerator (not shown in the figure) to treat pure water, and according to the need, water quality sampling port is added in the water pipeline, so as to detect the water quality before starting, and the water quality should meet the standard of GB1576 Industrial Boiler Water Quality of the People's Republic of China.

[0062] REFERENCE Figure 4 and Figure 5The gas heating assembly 100 comprises a furnace 110, and functional components installed inside the furnace 110 and liquid level monitoring components 190 installed outside the furnace 110, wherein the furnace 110 has a gas burner 120, a heat exchange pipe 130, a water collecting tank 140, an evaporation tank 150, a steam-water separation pipe 160, a steam collecting tank 170, and a heat collecting baffle 180, and the furnace shell 111 adopts a composite structure of stainless steel and refractory insulation material, wherein the refractory insulation material is attached 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 components, a specific technical effect is formed (the technical effect is described in detail in the following chapters).

[0063] Further, the furnace shell 111 is preferably a cylindrical stainless steel shell with a top plate and a bottom plate, which is welded and formed and has a layer of refractory insulation material. The bottom plate of the furnace shell 111 is provided with a mounting window hole for mounting the gas burner 120, i.e. the gas burner 120 in the furnace 110 provides a heating source in an upward and lateral upward direction. A smoke exhaust window hole 112 is formed in the side of the furnace shell 111, which is rectangular or circular, located on the side, and an exhaust gas treatment assembly 500 is installed outside the smoke exhaust window hole 112. The exhaust gas treatment assembly 500 has a flue gas passage 510 and a preheating water pipe 520 arranged in the flue gas passage 510. The preheating water pipe 520 is arranged in the flue gas passage 510 in a U-shaped meandering manner. The cold water in the pipe exchanges heat with the high-temperature flue gas in the flue gas passage 510 during the process of passing through the preheating water pipe 520. The outer end of the preheating water pipe 520 is connected to a water replenishing pump 400, which replenishes water to the boiler. At the same time, when external cold water passes through the preheating water pipe 520 in the flue gas passage 510, it exchanges heat with the high-temperature exhaust gas, achieving preheating utilization of incoming water and reducing energy consumption, which is one of energy-saving technical means. The preheated warm water enters the boiler, specifically the water collecting tank 140 in the boiler.

[0064] Further, the water used in the boiler in the present technology is pure water. The so-called pure water in the present embodiment refers to softened pure water that has been subjected to nanofiltration and deoxidization.

[0065] Reference Figure 6 Further, the heat collecting baffle 180 is arranged in the furnace 110. The inside of the heat collecting baffle 180 is the combustion chamber of the furnace 110, which is the heat exchange place of flame and water. The outline of the heat collecting baffle 180 is designed according to the shapes of the heat exchange pipe 130, the evaporation tank 150, and the steam-water separation pipe 160, and maintains an appropriate distance with the heat exchange pipe 130, the evaporation tank 150, and the steam-water separation pipe 160, which is between 1 cm and 5 cm. The heat collecting baffle 180 functions to heat and reflect thermal radiation.

[0066] In addition, the inner surface of the heat collecting baffle 180 is provided with a mirror surface coating, which can improve the efficiency of heat reflection.

[0067] Further, the heat collecting baffle 180 is divided into three sections, and the middle section is provided with smoke exhaust holes in the upper and lower ranges of one-third of the top / bottom, which cover at least the evaporation tank 150, the steam-water separation pipe 160 bottom, the heat exchange pipe 130 top, etc. The smoke exhaust holes are arranged in an array of circular holes, which are arranged as follows: large aperture near the evaporation tank 150, and gradually decreasing in size in the upward and downward directions. This arrangement allows high-temperature flue gas to diffuse outward from the covered area, so that the high-temperature area is in the upper part, which improves the local problem of the evaporation tank 150, and under the same combustion conditions, the evaporation tank 150 can obtain more heat energy, thereby producing higher heat exchange efficiency and increasing steam production per unit time, which has a positive significance for improving the utilization efficiency of heat energy.

[0068] Further, a reinforcing cylinder 181 is provided outside the heat collecting baffle 180, which is spot-welded with the heat collecting baffle 180 to form a whole, so as to improve the rigidity of the heat collecting baffle 180, which has a positive significance for the shape stability of the heat collecting baffle 180 under high temperature.

[0069] Further, a circular fire-resistant hearth plate 182 is provided outside the heat collecting baffle 180 at positions spaced apart by about 20-30 cm, which is coaxially arranged with the heat collecting baffle 180 to form an annular high-temperature flue gas passage 183 between the heat collecting baffle 180 and the outer shell of the hearth 110, and form a closed air insulation cavity 184 between the hearth 110 and the outer shell. The fire-resistant insulation material is attached to the inner wall of the outer shell, which makes the heat insulation effect of the hearth 110 optimal through the fire-resistant hearth plate 182, air insulation cavity 184 and fire-resistant insulation material.

[0070] Further, the heat collecting baffle 180, reinforcing cylinder 181 and fire-resistant hearth plate 182 are preferably made of alloy materials that can resist the temperature of gas flame, such as chromium / nickel high-temperature plates. The heat collecting baffle 180 and reinforcing cylinder 181 are provided with a hollow structure to allow flue gas to pass through.

[0071] Further, the flue gas and other high-temperature exhaust gas generated by the gas burner 120 are discharged through the only exhaust gas treatment assembly 500, which is preheated by cold water during the discharge process to achieve the purpose of energy saving. The inner wall of the exhaust gas treatment assembly 500 is also treated with fire-resistant insulation material.

[0072] The following chapters will be described in detail in the heat exchange tube 130, the water collecting tank 140, the evaporation tank 150, the steam-water separation pipe 160, the steam collecting tank 170 of the heat exchange assembly in the present invention, and this part is also the essence of the present invention.

[0073] In the present boiler, the water collecting tank 140, the evaporation tank 150, and the steam collecting tank 170 are single annular stainless steel tank bodies, and annular cavities are formed inside, and the water collecting tank 140 is located on the bottom plate of the hearth 110 and is installed in a mechanical fixed manner, such as bolt fixing. The steam collecting tank 170 is located on the top plate of the hearth 110 and is installed in a fixed manner. The evaporation tank 150 is located at the upper middle part of the hearth 110, and is best located at the high point of the flame, and is mechanically connected in a through manner between the evaporation tank 150 and the water collecting tank 140 through a plurality of heat exchange tubes 130. The liquid water is heated between the water collecting tank 140 and the evaporation tank 150 until boiling. According to the physical properties of the heated water, the boiling water appears in the evaporation tank 150 at the top, and the evaporation area of the hot water from the heat exchange tube 130 into the evaporation tank 150 is greatly increased, and the liquid level in the evaporation tank 150 is controlled to be at a substantially constant position through liquid level control technology. A plurality of steam-water separation pipes 160 are mechanically connected in a through manner between the evaporation tank 150 and the steam collecting tank 170 above, and in this way, a complete through channel is formed between the water collecting tank 140, the heat exchange tube 130, the evaporation tank 150, the steam-water separation pipe 160, and the steam collecting tank 170, which is the heat exchange core of the through-flow boiler. The detailed structure of each component will be described in detail below.

[0074] The technical effect of the present technology is that the arc-shaped heat exchange surface area of the heat exchange tube 130 is large, which can realize rapid heat exchange, and the evaporation area in the evaporation tank 150 is large, which realizes large-scale evaporation, solves the technical problem of small evaporation capacity in the traditional heat exchange tube 130, and creatively realizes the goal of rapid heating and large-scale evaporation.

[0075] Further, the vertical section of the evaporation tank 150 is rectangular or circular, and the present embodiment shows a rectangular section. This rectangular section is convenient for hole opening and welding and fixing with the heat exchange tube 130.

[0076] The gas burner 120 is installed in the central position of the inner cavity of the hearth 110 surrounded by the heat exchange tube 130, and heats the heat exchange tube 130 / evaporation tank 150 and the like arranged around, wherein the gas pressure (dynamic pressure) used by the gas burner 120 is 3kPa to 8kPa, the fuel is standard natural gas, and the gas calorific value should be 6500kcal / Nm³ to 8500kcal / Nm³.

[0077] The heat exchange pipe 130 in the present technology is the main place for heating water, so that the cold water is heated to boiling water. The small space of the water channel inside the heat exchange pipe 130, the space occupying rod 131, etc. reduces the water volume of the boiler and meets the national requirement of less than 30L.

[0078] The evaporation tank 150 in the present technology is provided at the top of the heat exchange pipe 130. Its function is to receive boiling water from the heat exchange pipe 130, which can greatly increase the surface area of the vapor-liquid separation interface, i.e. the boiling water in the evaporation tank 150 is in a continuous boiling state, which is more than twice the surface area of the vapor-liquid separation interface in the traditional straight pipe 162. After the implementation of the present embodiment, the evaporation capacity can reach more than 1000 kg per hour, which has the characteristics of high steam generation efficiency.

[0079] Figure 17 And Figure 18 The comparison shows the area comparison of the vapor-liquid separation interface before and after improvement. The ratio of the surface area of the vapor-liquid separation interface before and after improvement is 1:4. Correspondingly, the implementation of the space occupying rod 131 can increase the production speed of hot water in the heat exchange pipe 130, realize rapid heat exchange and large amount of steam production.

[0080] Further, the evaporation tank 150 is provided with a boiling stop net 151. The boiling stop net 151 is a functional component provided at the vapor-liquid separation surface (referred to as vapor-liquid separation interface). Its function is to eliminate the large water spray generated by the boiling high-temperature water, thereby reducing the water content of the steam entering the next pipeline and improving the quality of the steam.

[0081] Further, the boiling stop net 151 is preferably a 304 stainless steel net or a stainless steel grid plate 175. The fixing method is spot welding or clamping. Refer to Figure 11 .

[0082] The boiling stop net 151 is selectively configured. Whether it is configured or not, it is within the protection scope of the present application.

[0083] The vapor-liquid separation interface in the evaporation tank 150 (the position is approximately coincident with the boiling stop net 151) is quantitatively set and monitored by the liquid level monitoring component 190 provided outside the boiler. After setting, the height of the vapor-liquid separation interface is basically stable and always exists in the evaporation tank 150. The setting and control of the vapor-liquid separation interface in the steam boiler is a conventional technology in the existing boiler, which will not be described here.

[0084] Refer to Figure 6, a plurality of said heat exchange pipes 130 are arranged around the gas burner 120 and form a heat exchange wall in the boiler furnace 110, wherein the heat exchange pipe 130 in the embodiment is preferably a 304 stainless steel pipe, the heat exchange pipe 130 is vertically arranged and has a liquid water channel inside, the heat exchange pipe 130 is only a water heating channel, and the vapor-liquid separation interface is not in the heat exchange pipe 130, so that the evaporation function of the heat exchange pipe 130 is separated. Preferably, the heat exchange pipes 130 are arranged in a circular array and form a circular combustion chamber inside the space, and the heat pipes are heated by the flame generated by the combustion of the gas. In order to increase the heating area of the heat exchange pipe 130, a proper gap is maintained between adjacent two heat exchange pipes 130, for example, a gap of 1-10 mm is maintained between adjacent heat exchange pipes 130. The existence of such gap can make the flame or the heat radiation of the flame surround and more uniformly act on the outer wall of the heat exchange pipe 130. Even so, in practice, the heat quantity of the pipe wall of the heat exchange pipe 130 on the side facing the flame is much larger than that of the pipe wall on the side away from the flame, that is, with the center of the flame as the origin, the heat exchange pipe 130 is not uniformly heated, and relatively speaking, the pipe wall of the heat exchange pipe 130 on the side facing the flame heats up faster. The traditional steam boiler has this drawback. To solve this problem, the embodiment is designed as follows.

[0085] Reference Figure 17 , in the embodiment, a placeholder rod 131 is arranged in the heat exchange pipe 130 from top to bottom. The existence of the placeholder rod 131 makes the liquid water channel 132 inside the heat exchange pipe 130 form a ring, that is, the liquid water channel 132 in the heat exchange pipe 130 forms a ring.

[0086] Further, the above-mentioned placeholder rod 131 is a hollow stainless steel rod with a hollow structure and is made of the same material as the heat exchange pipe 130. The placeholder rod 131 is arranged in the heat exchange pipe 130 at an eccentric position. The eccentrically arranged placeholder rod 131 makes the internal liquid water channel 132 form an eccentric ring, and the eccentricity is arranged away from the center axis of the furnace 110. This arrangement exactly meets the characteristics that the heat exchange pipe 130 on the side facing the flame is heated and heated up quickly, that is, the side with large heat radiation has large water quantity, which makes full use of the heat radiation distribution characteristics in the furnace 110, so that the cold water in the liquid water channel 132 is heated more uniformly, and the heating speed and effect are improved.

[0087] An embodiment is shown, and the upper end of the placeholder rod 131 is integrated with the return pipe 163 in the steam-water separation pipe 160.

[0088] A transformed embodiment, the placeholder rod 131 is independent, and the lower end is fixed at the water collecting tank 140, and the upper end abuts against the return pipe 163.

[0089] In a variable implementation, 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 inside of the heat exchange pipe 130 to form a placeholder space.

[0090] In this embodiment, the steam-water separation pipe 160 is arranged between the evaporation box 150 and the steam collecting box 170. The steam-water separation pipe 160 is arranged to separate water from the wet steam, improve the steam dryness, and ensure the steam quality. The high-quality steam separated by the steam-water separation pipe 160 continues to enter the steam collecting box 170, and the separated liquid water enters the heat exchange pipe 130 or the steam box again through the reflux pipe 163, thereby solving the problem that in the traditional technology, the wet steam is pushed to the top steam collecting box 170 under the action of air pressure, and improving the steam quality.

[0091] Reference Figure 11 and Figure 13 From the spatial structure, the steam-water separation pipe 160 includes a middle elbow pipe portion 161, which is an S pipe or a Z pipe. The lower end of the elbow pipe portion 161 is directly or indirectly welded and connected to the evaporation box 150 and penetrates through the evaporation box 150. The upper end of the elbow pipe portion 161 is connected to the steam collecting box 170 through a vertically arranged straight pipe 162, and the steam after dehumidification is transported upward. A small hole is opened at the turning low point of the elbow pipe portion 161, and a reflux pipe 163 is welded and fixed at the small hole. The reflux pipe 163 extends vertically downward, penetrates through the wall of the box, and then enters the evaporation box 150 and is inserted below the liquid surface. According to the insertion depth, the lower end of the reflux pipe 163 can be located in the heat exchange pipe 130 or in the evaporation box 150. A reflux hole 164 is arranged at the low point of the reflux pipe 163. The reflux hole 164 must be located below the liquid water surface. The insertion depth can be designed and calculated according to the requirement, so that the condensed water separated from the wet steam is returned to the evaporation box 150 or the heat exchange pipe 130.

[0092] Specifically, the elbow pipe portion 161 has two turns. The first turn changes the steam channel from obliquely upward to obliquely downward, which is a sharp turn of more than 270 degrees. The second turn changes the steam channel from obliquely downward to obliquely upward or straight upward, which is also a sharp turn of more than 270 degrees. Through the arrangement of the two turns, the steam forms a sharp impact in the elbow pipe portion 161, so that the water contained in the saturated steam is separated.

[0093] Further, the reflux pipe 163 and the placeholder rod 131 are welded and fixed to form an integral whole.

[0094] Further, the above-mentioned elbow pipe portion 161 includes at least two styles, referring to Figure 19 and Figure 20 .

[0095] The steam-water separation tube 160 is arranged uniformly and equidistantly in the circumferential direction, has a reasonable gap, and is in a high-temperature state under the action of the flame. The steam-water separation tube 160 further heats the steam in the tube and separates most of the water condensate in the process, realizes drying of the steam, and thus improves the quality of the steam.

[0096] Further, the inner surface of the steam-water separation tube 160 has a coating with a rough surface structure. The coating can increase the impact area of the steam with the tube wall, and further improve the steam-water separation effect.

[0097] Further, an expansion joint 165 is arranged at the middle upper section of the steam-water separation tube 160, that is, the section close to the straight tube 162 of the steam collecting tank 170. Referring to FIG. 1, the expansion joint 165 is a structure with an expansion. The expansion joint 165 can eliminate the thermal expansion and contraction of the heat exchange tube 130 and the steam-water separation tube 160 during the start-stop conversion of the boiler. In the embodiment, the number of expansion joints 165 can be multiple. The expansion joint 165 is arranged in the steam section, does not occupy the temporary water storage space of the pure water, and solves the problem of fatigue damage of the welding points caused by thermal expansion and contraction. Figure 13

[0098] The steam-water separation process and principle of the wet steam in the steam-water separation tube 160 are as follows:

[0099] After the wet steam is discharged from the evaporation tank 150, the wet steam is rapidly bent by more than 270 degrees under the bending and detouring action of the elbow pipe 161. In this process, the wet steam collides with the inner wall of the pipe, and the water condenses on the pipe wall and flows downward and collects along the inclined pipe. Meanwhile, the wet steam collides with the protrusions on the rough surface of the pipe wall, further improves the steam-water separation effect, and realizes the discharge of the water separated by steam-water separation to the evaporation tank 150, thereby obtaining high-quality steam with low water content.

[0100] The steam collecting tank 170 is a whole annular stainless steel tank structure, has an annular space inside, and is used to receive high-quality steam from the steam-water separation tube 160. Specifically, a plurality of pipe interfaces are arranged at the top of the steam collecting tank 170, and a plurality of flange pipes are welded, for example, three flange pipes are arranged in the embodiment. One flange pipe is a steam outlet 171 and is provided with a steam valve 210. Another flange pipe is a steam pressure relief port 172 and is provided with a steam pressure relief valve 220. The third flange pipe is a liquid level interface 173 and is connected with a liquid level monitoring component 190. The upper end of the steam-water separation tube 160 is inserted into the steam collecting tank 170, and the upper ends of a plurality of steam-water separation tubes 160 are arranged uniformly along the steam collecting tank 170.

[0101] ​At the steam-water separation pipe 160 port in the above-mentioned steam collecting box 170, a plurality of flow guide pipes 166 are selectively installed, the flow guide pipe 166 is L-shaped, one end is inserted into the above-mentioned steam-water separation pipe 160 top end port, the other end is directed towards the annular steam collecting space 174, and is arranged along the tangent direction β of the steam collecting space 174, for reference Figure 15 In this embodiment, the arrangement relationship between the flow guide pipe 166 and the above-mentioned steam-water separation pipe 160 is that one is arranged every interval, for reference Figure 15 The technical advantages of this arrangement are as follows:

[0102] After the steam comes out of the steam-water separation pipe 160, it is sprayed out in a tangential and horizontal direction at high speed under the action of the above-mentioned flow guide pipe 166, and a large number of flow guide pipes 166 form a vortex of steam, that is, the steam forms a high-speed vortex in the steam collecting cavity, thereby further separating the water in the steam, and the separated water flows back to the evaporating box 150 through the steam-water separation pipe 160 without the flow guide pipe 166.

[0103] Further, at least one top of the above-mentioned steam-water separation pipe 160 is not installed with the flow guide pipe 166, so that the water generated in the steam collecting box 170 can smoothly flow back to the backflow pipe 163.

[0104] Further, a horizontally arranged metal mesh or grid plate 175 is arranged in the above-mentioned steam collecting space 174, which functions to increase the collision with the steam and separate the water contained in the steam during the collision.

[0105] The above-mentioned flow guide pipe 166 is fixed at the steam-water separation pipe 160 pipe opening position by expansion.

[0106] The water collecting box 140 is located at the bottom of the hearth 110, has a cold water flange interface and a liquid level monitoring interface, has an annular water storage space 141 in the water collecting box 140, and two C-shaped profile occupying bodies 142 are arranged and installed in the water storage space 141, the occupying body 142 is a hollow stainless steel box, is fixed at the middle and lower position, and avoids the lower end open part of the heat exchange pipe 130. The pure water (from the water supplement pump 400) from the above-mentioned cold water flange interface is divided into water in the water storage space, that is, the cold water or preheated water from the cold water flange interface is supplemented to each heat exchange pipe 130.

[0107] The above-mentioned occupying body 142 functions to occupy a certain space, reduces the water storage amount in the water collecting box 140, and reduces the tonnage data of the boiler, which has a positive significance for achieving the design goal of less than 30L. When the water collecting box 140 is designed to be relatively flat, the occupying body 142 is omitted.

[0108] The water temperature of the pure water in the heat exchange pipe 130 is gradually increased from bottom to top, and the pure water near the top end, especially near the evaporation box 150, is in a boiling state, and the vapor-liquid separation interface in the evaporation box 150 forms a surface with a larger area than the total cross-sectional area of the heat exchange pipe 130 (area multiplication). And the evaporation box 150 has a larger heating surface area, so that the technical effect of the technology is implemented, especially under the condition of the same specification heat exchange pipe 130, the evaporation capacity is obviously improved. And through the setting of the steam-water separation pipe 160 and the direction optimization of the flow guide pipe 166, the steam dryness is improved.

[0109] Further, the upper end of the heat exchange pipe 130 in the embodiment is staggered with the lower end of the steam-water separation pipe 160, so as to avoid the direct boiling water in the heat exchange pipe 130 towards the lower end of the steam-water separation pipe 160, and optimize the steam path.

[0110] Further, the surface of the space bar 131 is pressed with a concave-convex structure, for example, a concave-convex pattern, which further increases the turbulent effect of the pure water in the heat exchange pipe 130, so that the pure water generates turbulent effect along the gravity direction, improving the heating efficiency.

[0111] Further, suitable refractory insulation materials are arranged at the top and bottom of the hearth 110.

[0112] Further, the gas burner 120 in the embodiment is a cylindrical burner which extends into the combustion chamber from the bottom of the hearth 110 shell, and the outer end is connected with the fan 121 and the gas pipe, the mixer, to generate flame, that is, to heat the hearth 110. The gas burner 120 is a purchased accessory and belongs to the prior art and will not be described in detail.

[0113] In the embodiment, the cold water is preliminarily preheated and enters from the lower end, the high-temperature steam is discharged at the top, and the water heating and steam generation and drying are completed in the process from bottom to top, forming a through-flow type steam boiler, and the pure water in all heat exchange pipes 130 is uniformly distributed by the lower water collecting tank 140, using the principle of communicating vessels, with the same height of liquid level.

[0114] It should be noted that the boiler needs to use pure water as the water source to effectively avoid scale in the heat exchange pipe 130 and the like.

[0115] In the embodiment, the number of heat exchange pipes 130 is between 30-50, for example, 36.

[0116] Further, the evaporation box 150 is a ring-shaped part made of 304 stainless steel welding, which is composed of a side plate and a top and bottom plate forming a ring-shaped evaporation cavity, which has a vapor-liquid evaporation interface. Holes are opened on the bottom plate and the top plate of the evaporation box 150 for installing the heat exchange pipe 130 and the vapor-liquid separation pipe.

[0117] In this embodiment, after the steam is generated, it is in a saturated steam state in the evaporation tank 150, that is, the steam in the evaporation tank 150 has a relatively high water content. Through the design and use of the vapor-liquid separation pipe, the present application separates most of the condensed water in the saturated steam to form high-quality steam, and further dehumidifies the steam in the steam collecting tank 170 to obtain high-quality steam with a relatively low water content.

[0118] In fact, the saturated steam after the above dehumidification treatment still carries part of the water when entering the top annular collecting tank, so the tangential flow guide pipe 166 structure is usually designed in the top annular collecting tank to form a cyclone or vortex, for example, a grid plate 175 is arranged in the annular collecting tank to separate the vapor-liquid, so as to obtain high-quality steam as much as possible.

[0119] However, theoretically, the steam obtained by the boiler still contains water, but as much as possible to obtain high-quality steam with a low water content, the lower the water content of the steam from the boiler, the smaller the workload of the post-connected boiler water vapor separator, and the more energy-saving, therefore, the water content of the steam directly from the boiler is an important data index of the through-flow boiler, the lower the steam water content, the more energy-saving.

[0120] The liquid level monitoring component 190 is connected between the water collecting tank 140 and the steam collecting tank 170, and is used to monitor the vapor-liquid separation interface in the furnace 110. It adopts an electrode type liquid level monitoring for water level control and alarm, and manual monitoring is combined with a glass observation window. When the liquid level is higher or lower than the set height, the system automatically triggers an alarm.

[0121] In this embodiment, the water level in the boiler is realized by the automatic water supply control system, and the intermittent water supply water level control and alarm are combined. The boiler water supply is a mature technology and will not be described here.

[0122] Further, a flue gas temperature sensor is arranged in the flue gas passage to monitor the flue gas temperature, and the monitoring of the flue gas temperature is realized by the equipment control system. Under normal circumstances, the flue gas temperature of the present equipment is less than 65℃, if the flue gas temperature value is abnormal, the boiler needs to be stopped for inspection.

[0123] The present boiler is provided with a pressure gauge and a pressure controller, which are matched with the PLC control technology to realize intelligent control, including water pressure monitoring and steam pressure monitoring. In order to ensure the correctness of the pressure gauge, it is checked at least once every half year.

[0124] The sensitivity and reliability of the pressure controller are checked regularly. The operator can preliminarily determine the reliability of the pressure controller by comparing the set pressure of the pressure controller with the data displayed by the controller when starting and stopping the burner.

[0125] The bottom of the water collecting tank 140 is also connected with a blowdown pipe and a blowdown valve. The reason is that the filtered pure water may contain mineral substances. When the water is heated and vaporized, these substances will be separated out. When the boiler water is concentrated to a certain degree, these substances will be deposited in the boiler to form a small amount of scale. The greater the evaporation amount and the longer the continuous operation time, the more the deposits. In order to prevent boiler accidents caused by scale and water slag, the blowdown valve (not shown in the figure) is arranged.

[0126] The above-described embodiments are merely preferred embodiments of the present application and are not intended to limit the scope of the present application. Various modifications and improvements to the present application made by those skilled in the art without departing from the design spirit of the present application shall fall within the scope of the present application as defined by the claims.

Claims

1. A through-flow energy-saving boiler, comprising a gas heating assembly, an exhaust gas treatment assembly and a water supply pump, characterized in that: a gas burner is arranged in a hearth of the gas heating assembly, and further comprising a water collecting tank, a heat exchange pipe, an evaporation tank, a steam-water separation pipe and a steam collecting tank arranged around the gas burner and penetrating from bottom to top, wherein: the water collecting tank is arranged at the bottom of the hearth and is connected with the water supply pump; a space-occupying rod is arranged in the vertically arranged heat exchange pipe, the space-occupying rod is arranged in the heat exchange pipe in an eccentric manner and forms a liquid water passage between the heat exchange pipe and the space-occupying rod, the horizontal section of the liquid water passage is an eccentric ring, and the eccentric ring is arranged in an eccentric manner away from the center axis of the hearth, under the continuous heating action of the gas burner, the water temperature in the heat exchange pipe gradually increases from bottom to top, and the water at the top end of the heat exchange pipe is in a boiling state until the water in the evaporation tank; the evaporation tank is arranged at a position of 60% to 80% of the height of the hearth, and the water surface in the evaporation tank 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 section areas of all the heat exchange pipes, 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 tank and the steam collecting tank, and a bend pipe portion for separating water in the saturated steam is arranged in the steam-water separation pipe, the bend pipe portion has two turning points of high and low, and an opening is arranged at the lowest position of the turning point of the low point, and the opening is connected to the evaporation tank through a return pipe, the return pipe is vertically downward and extends below the water level in the evaporation tank, realizing primary steam-water separation; L-shaped flow guide pipes are arranged on at least half of the upper ports of the steam-water separation pipe, one end of the flow guide pipe is mechanically fixed at the top end of the steam-water separation pipe, and the other end is arranged in the annular steam collecting space along the tangent direction of the steam collecting space, the steam is sprayed in a high-speed tangential and horizontal direction, and forms a vortex steam under the guidance of the flow guide pipe, realizing secondary steam-water separation, and the separated condensed water returns to the evaporation tank through the steam-water separation pipe without the flow guide pipe and the return pipe; the flue gas passage in the exhaust gas treatment assembly is connected with the flue in the hearth through a laterally arranged smoke exhaust window, and a preheating water pipe is arranged in the flue gas passage, the preheating water pipe is connected to the water collecting tank through the water supply pump, and the water supply pump supplies water for the gas heating assembly and keeps the vapor-liquid separation interface in the evaporation tank constant. A boiling prevention net is arranged in the evaporation tank, and the boiling prevention net is arranged at the vapor-liquid separation interface. An expansion joint is arranged in the upper section of the steam-water separation pipe, and the expansion joint compensates the thermal expansion and cold contraction of the heat exchange pipe and the steam-water separation pipe. A metal mesh or grid plate is arranged in the steam collecting space. A heat gathering baffle is arranged in the hearth, the heat gathering baffle is arranged at the periphery of the heat exchange pipe and maintains a distance of 1-5 cm with the heat exchange pipe, a reinforcing cylinder is arranged outside the heat gathering baffle, and the heat gathering baffle and the reinforcing cylinder are provided with hollow smoke exhaust holes. ​ ​ ​ 2. A cross flow energy saving boiler as claimed in claim 1, wherein ​ 3. A cross flow energy saving boiler as claimed in claim 1 wherein, ​ 4. A cross flow energy saving boiler as claimed in claim 1 wherein, ​ 5. A cross flow energy saving boiler as claimed in claim 1 wherein, ​ 6. A cross flow energy saving boiler as claimed in claim 1 wherein, Further comprising a refractory hearth plate, which forms an annular high-temperature flue gas passage with the heat-collecting baffle and forms an air insulation cavity with the hearth shell.

7. A cross flow energy saving boiler as claimed in claim 1 wherein, The arrangement relationship between the flow guide pipe and the steam-water separation pipe is that one is arranged every interval.

8. A cross flow energy saving boiler as claimed in claim 1 wherein, The elbow pipe part is an S pipe or a Z pipe with two turns.

9. A cross flow energy saving boiler as claimed in claim 1 wherein, The backflow pipe is fixed by welding with the space-occupying rod, the lower end of the backflow pipe is located in the heat exchange pipe, a backflow hole is arranged at the low point of the backflow pipe, and the condensed water separated from the saturated steam is returned to the evaporation box or the heat exchange pipe.

10. The cross flow energy saving boiler as claimed in claim 1, wherein Further comprising a liquid level monitoring component installed outside the hearth, which connects the water collecting box and the steam collecting box through a pipeline interface, and the vapor-liquid separation interface in the evaporation box is quantitatively set and monitored by the externally arranged liquid level monitoring component.

11. A cross flow energy saving boiler as claimed in claim 1, wherein, The inner surface of the steam-water separation pipe has a coating with a rough surface structure, and the surface of the space-occupying rod is pressed with a concave-convex structure.

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

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