A fully premixed condensing boiler

Abstract

The present invention discloses a full premixed condensing boiler, comprising a burner and a heat exchanger, wherein the heat exchanger comprises a heat exchanger shell, wherein a burner mounting block is arranged inside the heat exchanger shell, wherein a combustion chamber is provided inside the burner mounting block, wherein a plurality of heat exchange tubes are connected between the bottom of the burner mounting block and the inner bottom surface of the heat exchanger shell, wherein the heat exchange tubes and the gap between the burner mounting block and the inside of the heat exchanger shell form a heat exchange chamber, wherein a condenser is arranged at the bottom of the heat exchanger shell, wherein the condenser comprises a cylinder, wherein the cylinder is penetrated from top to bottom and a condensation channel is formed, wherein one end of the heat exchange tube is connected to the combustion chamber in the burner mounting block and the other end is connected to the condensation channel, wherein a water inlet chamber and a water outlet chamber are provided in the interlayer between the outer wall of the cylinder and the inner wall formed by the condensation channel, wherein a plurality of condensation tubes horizontally arranged in the condensation channel are connected between the water inlet chamber and the water outlet chamber, wherein the two ends of the condensation tubes are respectively connected to the water inlet chamber and the water outlet chamber. The present boiler can greatly improve the thermal efficiency.

Description

Technical Field

[0001] The invention belongs to boiler equipment, and in particular relates to a full premixed condensing boiler. Background Art

[0002] The fully premixed condensing boiler is a new type of hot water boiler that integrates the two most energy-saving technologies currently available - full premixing technology and condensing technology. Full premixing means that the gas and air are fully mixed in a certain proportion before combustion, and no air supply is required during the combustion process. The fully premixed combustion has a fast flame propagation speed, high volumetric thermal intensity in the combustion chamber, and can achieve complete combustion with a very small excess air coefficient, and can produce high-temperature flue gas.

[0003] A general full premix condensing boiler includes a burner and a heat exchanger. The smoke-generating end of the burner is installed in the combustion chamber of the heat exchanger. A base is provided below the heat exchanger. A number of vertical heat exchange tubes made of copper with high thermal conductivity are provided between the base and the heat exchanger. Cold water to be heated flows from bottom to top in the heat exchange tubes. The heat exchange tubes are surrounded by two concentric circles, with the inner and outer circles offset. A vertical flue is formed in the center surrounded by the heat exchange tubes. The burner generates high-temperature flue gas and blows the high-temperature flue gas into the flue through a fan provided in the burner. The high-temperature flue gas contacts the wall of the heat exchange tube for heat exchange, so that The cold water in the heat exchange tube gradually heats up and is finally discharged from the top outlet. As the high-temperature flue gas continuously exchanges heat with the heat exchange tube, the temperature of the flue gas becomes lower as it flows downward, and eventually part of it will condense into condensed water and flow out. Some of the uncondensed flue gas is discharged at a lower temperature. In this process, the center of the flue is actually a cavity. The high-temperature flue gas is blown from top to bottom by the fan and exchanges heat with the heat exchange tube at the edge of the cavity. Some of the high-temperature flue gas flows directly downward without sufficient heat exchange with the wall of the heat exchange tube, resulting in heat loss. In the end, the actual thermal efficiency is not high, only about 101%. Summary of the invention

[0004] In view of the above-mentioned deficiencies of the prior art, the technical problem to be solved by the present invention is: how to provide a fully premixed condensing boiler that can greatly improve the thermal efficiency and save fuel compared with the existing condensing boilers.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] A fully premixed condensing boiler comprises a burner and a heat exchanger, the heat exchanger comprising a heat exchanger shell, a burner mounting block is provided inside the heat exchanger shell, a combustion chamber is opened inside the burner mounting block, the smoke-generating end of the burner is arranged in the combustion chamber and generates high-temperature flue gas, a plurality of heat exchange tubes are connected between the bottom of the burner mounting block and the inner bottom surface of the heat exchanger shell, the heat exchange chamber is formed by the gap between the heat exchange tubes and the burner mounting block and the inside of the heat exchanger shell, a condenser is provided at the bottom of the heat exchanger shell, the condenser comprises a cylinder body, the cylinder body passes through from top to bottom and forms a condensation channel, one end of the heat exchange tube is connected to the combustion chamber in the burner mounting block and the other end is connected to the condensation channel, the interlayer between the outer side wall of the cylinder body and the inner side wall formed by the condensation channel is provided with a water inlet chamber and a water outlet chamber, the water inlet chamber and the water outlet chamber A number of condensing tubes are horizontally placed in the condensing channel and are connected between the water chambers. Both ends of the condensing tubes are connected with the water inlet chamber and the water outlet chamber respectively. The water inlet chamber is provided with a first water inlet, the water outlet chamber is provided with a first water outlet, the heat exchange chamber is provided with a second water inlet connected with the first water outlet and a second water outlet connected with the outside. A flue gas discharge port connected with the condensing channel is also provided at the bottom of the cylinder body. The high-temperature flue gas enters the condensing channel through the heat exchange tube and is condensed and cooled through the condensing tube with cold water flowing therein, and then is discharged from the flue gas discharge port. The cold water to be heated flows into the heat exchange chamber through the first water inlet, the water inlet chamber, the condensing tube, the water outlet chamber, the first water outlet, and the second water inlet in turn, and is heated and discharged from the second water outlet through the outer wall of the heat exchange tube, the outer wall of the burner mounting block and the high-temperature flue gas generated by the burner to obtain the required hot water.

[0007] In this way, the boiler is achieved by separately arranging the heat exchanger and the condenser, and arranging heat exchange tubes and a heat exchange chamber in the heat exchanger. The high-temperature flue gas generated by the burner is discharged into the condensation channel connected thereto through the heat exchange tubes, and a plurality of condensation tubes are horizontally arranged in the condensation channel, and cold water flows through the condensation tubes from the water inlet chamber to the water outlet chamber. When the cold water is heated, the cold water flows into the heat exchange chamber from the first water inlet, the water inlet chamber, the condensation tube, the water outlet chamber, the first water outlet, and the second water inlet in sequence. When the high-temperature flue gas is discharged into the condensation channel, it fully contacts the condensation tube. When the flue gas is cooled and condensed, the cold water in the condensation tube is also preliminarily heated and heated. When it flows into the heat exchange chamber later, it fully contacts the heat exchange tube and the burner mounting block. Since the flue gas generated in the combustion chamber has the highest temperature and the least heat loss, the water in the heat exchange chamber further exchanges heat with the wall of the heat exchange tube and the wall of the burner mounting block, and is further heated. Finally, it is discharged from the second water outlet to obtain the required hot water. The heat exchange tubes in the condensing boiler are placed vertically, and the lower section of the heat exchange tubes also serves as condensing tubes. Compared with the existing condensing boilers, the flue gas in this boiler is in more complete contact with the horizontally placed condensing tubes during condensation heat exchange, and the heat loss of the flue gas during the condensation stage will be less, which can make the water have a relatively high temperature before entering the heat exchange chamber, and then further heat exchange and heat up through sufficient contact with the heat exchange tubes and the burner mounting block wall. When this boiler performs primary heat exchange in the heat exchanger, the water is outside the heat exchange tubes and the flue gas is inside the heat exchange tubes. When condensation and secondary heat exchange are performed in the condenser, the water circulates in the condensing tubes and the flue gas circulates outside the condensing tubes. Compared with the prior art, the water is in the heat exchange tubes both in the heat exchange and condensation stages, while the flue gas is always outside the heat exchange tubes. The heat brought by the high-temperature flue gas is fully utilized, and the heat loss of the flue gas is reduced to a minimum, so that the final total thermal efficiency is greatly improved compared with the existing condensing boilers, and the thermal efficiency can reach 106%~107%, which can save fuel.

[0008] At the same time, in order to ensure thermal efficiency, the existing boilers generally have a large number of heat exchange tubes with small intervals between them. Since the upper section of the heat exchange tube is in the main heat exchange stage, the flue gas temperature is still very high and condensed water cannot be produced. Over time, dust particles will be deposited on the outer surface of the heat exchange tube, especially in northwest windy and sandy areas such as Xinjiang. The air contains more dust particles and is more likely to accumulate. After using it for a period of time, the entire boiler needs to be disassembled for dust cleaning, which is very cumbersome. In this application, the heat exchanger and condenser can be separately arranged, and the first water outlet and the second water inlet can be connected with a water pipe in the middle. The heat exchange tube in this application is for high-temperature flue gas, and the inner wall of the tube is due to the burner fan. The blowing effect will not accumulate dust, and the flue gas discharged into the condensation channel will flow downward through several condensation tubes. Cold water from the water inlet chamber to the water outlet chamber circulates in the condensation tubes. The flue gas is fully in contact with the condensation tube wall for heat exchange and then cools down to condense and produce condensed water. The large amount of condensed water produced can flush the inner surface of the condenser and the outer surface of the condensation tube to clean the dust contained in the flue gas. It has the function of self-cleaning and does not need to be disassembled for cleaning after using it for a period of time, which is convenient for use. In addition, whether it is a heat exchanger or a condenser, for the high-temperature flue gas generated by boiler combustion, it is discharged through a large channel, and the discharge resistance of the boiler flue gas is very small, which plays a role in stabilizing combustion and exhausting smoke.

[0009] As an optimization, the condenser is provided with several condensers, which are stacked up and down, and the central axes of the condensation channels of all the condensers are located on the same straight line. The first water outlet of the condenser on the top layer is connected with the second water inlet, and the first water inlet of the condenser on the bottom layer is connected with the external water inlet pipe. The first water outlet of the condenser on the lower layer of the two adjacent condensers is connected with the first water inlet of the condenser on the upper layer.

[0010] In this way, in order to improve the heat exchange efficiency and condensation efficiency, multiple condensers can be set according to actual needs. The multiple condensers and the heat exchanger are assembled together up and down to form a modular boiler equipment. The two adjacent condensers are connected, and the first water outlet and the first water inlet of the two adjacent condensers can be connected by an external water pipe. The first water outlet of the uppermost condenser can also be connected to the second water inlet of the heat exchange chamber through an external water pipe, so that the cold water introduced from the first water inlet of the lowermost condenser can pass through each condenser and finally reach the heat exchange chamber. In this process, it flows through the condenser tubes in each condenser, thereby exchanging heat with the flue gas flowing through the condenser tubes, cooling the flue gas, condensing to produce condensed water, and the cold water in the condenser tubes absorbs heat and heats up all the way until it flows into the heat exchange chamber. This modular assembly method is convenient for transportation, disassembly, maintenance and component replacement of equipment, and can also improve heat exchange efficiency and condensation efficiency according to actual needs.

[0011] As an optimization, the cross section of the condensation channel is circular, and the condensation channel and the cylinder share a central axis.

[0012] As an optimization, an annular sealed chamber is provided in the interlayer between the outer wall of the cylinder and the inner wall formed by the condensation channel. Two vertical partitions are provided in the sealed chamber to divide it into two independent cavities on the left and right, one of which is a water inlet chamber and the other is a water outlet chamber.

[0013] In this way, by opening an annular sealed chamber in the interlayer between the outer wall and the inner wall of the cylinder, the cylindrical shape of the cylinder is utilized as much as possible, so that the volume of the sealed chamber is larger and can accommodate more water, thereby increasing the water throughput and thus improving the heat exchange efficiency. The sealed chamber is divided into two parts by a partition to form a water inlet chamber and a water outlet chamber respectively, thereby maximizing the utilization of the space of the sealed chamber without directly connecting the two, so that part of the water can flow from the water inlet chamber into the water outlet chamber without passing through the condenser, thereby reducing the condensation efficiency.

[0014] As an optimization, the plurality of condensing tubes are arranged in parallel at intervals and have an angle of 6 to 10 degrees with the horizontal plane, and the cross-section of the condensing tube is elliptical, and its long axis is arranged vertically.

[0015] In this way, the condenser is at a certain angle to the horizontal plane and is obliquely connected between the water inlet chamber and the water outlet chamber. This can facilitate the condensed water generated on the condenser to flow down from high to low, which is beneficial to the flow of condensed water on the upper surface of the condenser. It can also make the condensed water flow along the condenser to the inner wall of the cylinder to clean it and prevent dust from accumulating on the inner wall of the cylinder. The elliptical cross-section of the condenser can maximize the number of condenser tubes that can be set in each row, while increasing the contact path and contact area between the flue gas and the condenser, and extending the heat exchange time. This can improve the condensation efficiency, and make it easier for the condensed water to flow down from the upper surface of the condenser, and it is also inconvenient for dust to deposit on its upper surface.

[0016] As an optimization, the plurality of condenser tubes are divided into multiple upper and lower rows, the condenser tubes in each row are evenly spaced, and the upper and lower positions of the condenser tubes between two adjacent rows are staggered.

[0017] In this way, through this distribution, the flue gas can be fully contacted with several condenser tubes, avoiding the phenomenon that the condenser tubes in the upper row just block the condenser tubes in the lower row, thereby causing the condenser tubes in the lower row to have insufficient contact with the flue gas, thereby reducing the condensation efficiency.

[0018] As an optimization, the burner mounting block, the heat exchanger shell and the heat exchange tubes are all made of copper, and the cylinder and the condenser are all made of stainless steel.

[0019] Thus, in the existing condensing boiler, in order to improve the heat exchange efficiency, the entire heat exchange tube is made of copper. However, the corrosion resistance of the heat exchange tube is poor. Long-term contact with acidic solutions is prone to produce verdigris. The heat exchange tube closer to the bottom encounters a lower flue gas temperature, and is more likely to condense and form condensed water. The hydrogen sulfide component contained in the flue gas easily reacts with water to form an acidic solution, thereby corroding the lower heat exchange tube. The present application is based on the respective characteristics of copper and stainless steel materials to form a heat exchanger and a condenser respectively. Since the heat exchanger part always passes through the heat exchange tube with high-temperature flue gas, no condensed water is generated, and no acidic solution is formed, which does not cause corrosion to the heat exchange tube. The condensed water generated in the condenser will react with hydrogen sulfide in the flue gas to form an acidic solution. However, since the condenser is made of stainless steel, it has the advantage of corrosion resistance and is not afraid of corrosion by acidic solutions, thus improving the durability and service life of the equipment.

[0020] As an optimization, the heat exchanger shell is cylindrical as a whole, the burner mounting block is arranged at the upper center of the heat exchanger shell, the bottom of the burner mounting block is a spherical structure protruding downward, and a plurality of heat exchange tubes are vertically arranged between the outer surface of the bottom of the burner mounting block and the inner surface of the bottom of the heat exchanger shell to support the burner mounting block and pass the high-temperature flue gas.

[0021] In this way, the bottom of the combustion chamber presents a spherical structure protruding downward, which is conducive to the downward gathering of high-temperature flue gas generated by the burner and being blown into the heat exchange tube by the burner's fan, thereby improving the heat exchange efficiency.

[0022] As an optimization, there is a gap between the top surface and the side surface of the burner mounting block and the inner wall of the heat exchanger shell, and the gap is connected to the heat exchange chamber. The second water outlet is arranged at the top of the heat exchanger shell and is connected to the heat exchange chamber through the gap, and the second water inlet is arranged at the lower part of the heat exchanger shell and is connected to the heat exchange chamber.

[0023] In this way, there is no contact between the burner mounting block and the inner wall of the heat exchanger shell, and the gap between the burner mounting block and the inner wall of the heat exchanger shell is connected to the heat exchange chamber, thereby increasing the heat exchange area of ​​the heat exchange chamber and improving the heat exchange efficiency.

[0024] As an optimization, a plurality of horizontal partitions are arranged from bottom to top in the heat exchange chamber to form an S-shaped water path from the second water inlet to the second water outlet.

[0025] In this way, by setting up multiple horizontal partitions to form an S-shaped water channel, water flowing into the heat exchange chamber from the bottom can be fully in contact with the heat exchange tubes and the burner mounting block before flowing out through the second water outlet at the top, thereby increasing the contact time between the water and the heat exchange tubes and the burner mounting block and improving the heat exchange efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1is a schematic structural diagram of an embodiment of the present invention;

[0027] Figure 2 is a cross-sectional view of an embodiment of the present invention;

[0028] Figure 3 It is a cross-sectional view of the embodiment of the present invention in another direction. DETAILED DESCRIPTION

[0029] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0030] For specific implementation: see Figures 1 to 3 A fully premixed condensing boiler comprises a burner 1 and a heat exchanger 2, wherein the heat exchanger 2 comprises a heat exchanger shell 3, wherein a burner mounting block is arranged inside the heat exchanger shell 3, wherein a combustion chamber 4 is provided inside the burner mounting block, wherein the smoke-generating end of the burner is arranged in the combustion chamber and produces high-temperature flue gas, wherein a plurality of heat exchange tubes 5 are connected between the bottom of the burner mounting block and the inner bottom surface of the heat exchanger shell, wherein a heat exchange chamber 6 is formed by the gap between the heat exchange tubes and the burner mounting block and the inside of the heat exchanger shell, wherein a condenser 7 is provided at the bottom of the heat exchanger shell, wherein the condenser 7 comprises a cylinder 8, wherein the cylinder 8 penetrates from top to bottom and forms a condensation channel, wherein one end of the heat exchange tube is connected to the combustion chamber in the burner mounting block and the other end is connected to the condensation channel, wherein a water inlet chamber 9 and a water outlet chamber 10 are provided in the interlayer between the outer wall of the cylinder and the inner wall formed by the condensation channel, wherein the inner wall formed by the outer wall of the cylinder and the inner wall formed by the condensation channel are provided with the water inlet chamber 9 and the water outlet chamber 10 ... condensation channel is provided with the water inlet chamber 9 and the water outlet chamber 10, wherein the inner wall formed by the condensation channel is provided with the water inlet chamber 9 and the water outlet chamber 10, wherein the inner wall formed by the condensation channel is provided with the water inlet chamber 9 and the water outlet chamber 10, wherein the inner wall formed by A plurality of condensing tubes 11 are connected between the water inlet chamber and the water outlet chamber, and both ends of the condensing tubes are connected with the water inlet chamber and the water outlet chamber respectively. The water inlet chamber is provided with a first water inlet, the water outlet chamber is provided with a first water outlet, the heat exchange chamber is provided with a second water inlet connected with the first water outlet and a second water outlet 12 connected with the outside. A flue gas discharge port connected with the condensation channel is also provided at the bottom of the cylinder body. The high-temperature flue gas enters the condensation channel through the heat exchange tube and is condensed and cooled through the condensing tube with cold water flowing therein, and then is discharged from the flue gas discharge port. The cold water to be heated flows into the heat exchange chamber through the first water inlet, the water inlet chamber, the condensing tube, the water outlet chamber, the first water outlet, and the second water inlet in turn, and is heated and discharged from the second water outlet through the outer wall of the heat exchange tube and the outer wall of the burner mounting block with the high-temperature flue gas generated by the burner to obtain the required hot water.

[0031] In this way, the boiler is provided with a heat exchanger and a condenser separately, and a heat exchange tube and a heat exchange chamber are provided in the heat exchanger. The high-temperature flue gas generated by the burner is discharged into the condensation channel connected thereto through the heat exchange tube, and a plurality of condensation tubes are horizontally arranged in the condensation channel, and cold water flows through the condensation tubes from the water inlet chamber to the water outlet chamber. When the cold water is heated, the cold water flows into the heat exchange chamber from the first water inlet, the water inlet chamber, the condensation tube, the water outlet chamber, the first water outlet, and the second water inlet in sequence. When the high-temperature flue gas is discharged into the condensation channel, it fully contacts the condensation tube. When the flue gas is cooled and condensed, the cold water in the condensation tube is also preliminarily heated and heated. When it flows into the heat exchange chamber later, it fully contacts the heat exchange tube and the burner mounting block. Since the flue gas generated in the combustion chamber has the highest temperature and the least heat loss, the water in the heat exchange chamber further exchanges heat with the wall of the heat exchange tube and the wall of the burner mounting block, and is further heated. Finally, it is discharged from the second water outlet to obtain the required hot water. The existing condensing boiler The heat exchange tubes in the boiler are placed vertically, and the lower section of the heat exchange tubes also serves as condensing tubes. Compared with the existing condensing boilers, the flue gas is more fully in contact with the horizontally placed condensing tubes during condensation heat exchange, and the heat loss of the flue gas during the condensation stage will be less, which can make the water have a relatively high temperature before entering the heat exchange chamber, and then further heat exchange and heat up through full contact with the heat exchange tubes and the burner mounting block wall. When the boiler performs the main heat exchange in the heat exchanger, water surrounds the heat exchange tubes on the outside of the heat exchange tubes, and the flue gas is inside the heat exchange tubes. When condensation and secondary heat exchange are performed in the condenser, water circulates in the condensing tubes and the flue gas circulates outside the condensing tubes. In the prior art, water is in the heat exchange tubes regardless of whether it is in the heat exchange or condensation stage, while the flue gas is always outside the heat exchange tubes. The boiler makes full use of the heat brought by the high-temperature flue gas, reduces the heat loss of the flue gas to a minimum, and greatly improves the final total thermal efficiency compared with the existing condensing boilers. The thermal efficiency can reach 106%~107%, which can save fuel.

[0032] At the same time, in order to ensure thermal efficiency, the existing boilers generally have a large number of heat exchange tubes with small intervals between them. Since the upper section of the heat exchange tube is in the main heat exchange stage, the flue gas temperature is still very high and condensed water cannot be produced. Over time, dust particles will be deposited on the outer surface of the heat exchange tube, especially in northwest windy and sandy areas such as Xinjiang. The air contains more dust particles and is more likely to accumulate. After using it for a period of time, the entire boiler needs to be disassembled for dust cleaning, which is very cumbersome. In this application, the heat exchanger and condenser can be separately arranged, and the first water outlet and the second water inlet can be connected with a water pipe in the middle. The heat exchange tube in this application is for high-temperature flue gas, and the inner wall of the tube is due to the burner fan. The blowing effect will not accumulate dust, and the flue gas discharged into the condensation channel will flow downward through several condensation tubes. Cold water from the water inlet chamber to the water outlet chamber circulates in the condensation tubes. The flue gas is fully in contact with the condensation tube wall for heat exchange and then cools down to condense and produce condensed water. The large amount of condensed water produced can flush the inner surface of the condenser and the outer surface of the condensation tube to clean the dust contained in the flue gas. It has the function of self-cleaning and does not need to be disassembled for cleaning after using it for a period of time, which is convenient for use. In addition, whether it is a heat exchanger or a condenser, for the high-temperature flue gas generated by boiler combustion, it is discharged through a large channel, and the discharge resistance of the boiler flue gas is very small, which plays a role in stabilizing combustion and exhausting smoke.

[0033] As an optimization, the condenser 7 is provided with several condensers which are stacked up and down, the central axes of the condensation channels of all the condensers are located on the same straight line, the first water outlet of the condenser on the top layer is connected with the second water inlet, the first water inlet of the condenser on the bottom layer is connected with the external water inlet pipe, and the first water outlet of the condenser on the lower layer of the two adjacent condensers on the upper and lower layer is connected with the first water inlet of the condenser on the upper layer.

[0034] In this way, in order to improve the heat exchange efficiency and condensation efficiency, multiple condensers can be set according to actual needs. The multiple condensers and the heat exchanger are assembled together up and down to form a modular boiler equipment. The two adjacent condensers are connected, and the first water outlet and the first water inlet of the two adjacent condensers can be connected by an external water pipe. The first water outlet of the uppermost condenser can also be connected to the second water inlet of the heat exchange chamber through an external water pipe, so that the cold water introduced from the first water inlet of the lowermost condenser can pass through each condenser and finally reach the heat exchange chamber. In this process, it flows through the condenser tubes in each condenser, thereby exchanging heat with the flue gas flowing through the condenser tubes, cooling the flue gas, condensing to produce condensed water, and the cold water in the condenser tubes absorbs heat and heats up all the way until it flows into the heat exchange chamber. This modular assembly method is convenient for transportation, disassembly, maintenance and component replacement of equipment, and can also improve heat exchange efficiency and condensation efficiency according to actual needs.

[0035] As an optimization, the cross section of the condensation channel is circular, and the condensation channel and the cylinder share a central axis.

[0036] As an optimization, an annular sealed chamber is provided in the interlayer between the outer wall of the cylinder 8 and the inner wall formed by the condensation channel. Two vertical partitions are provided in the sealed chamber to divide it into two independent cavities on the left and right, one of which is a water inlet chamber and the other is a water outlet chamber.

[0037] In this way, by opening an annular sealed chamber in the interlayer between the outer wall and the inner wall of the cylinder, the cylindrical shape of the cylinder is utilized as much as possible, so that the volume of the sealed chamber is larger and can accommodate more water, thereby increasing the water throughput and thus improving the heat exchange efficiency. The sealed chamber is divided into two parts by a partition to form a water inlet chamber and a water outlet chamber respectively, thereby maximizing the utilization of the space of the sealed chamber without directly connecting the two, so that part of the water can flow from the water inlet chamber into the water outlet chamber without passing through the condenser, thereby reducing the condensation efficiency.

[0038] As an optimization, the plurality of condensing tubes 11 are arranged in parallel at intervals and have an angle of 6 to 10 degrees with the horizontal plane, and the cross-section of the condensing tube is elliptical, and its long axis is arranged vertically.

[0039] In this way, the condenser is at a certain angle to the horizontal plane and is obliquely connected between the water inlet chamber and the water outlet chamber, which can facilitate the condensed water generated on the condenser to flow down from high to low, which is beneficial to the flow of condensed water on the upper surface of the condenser, and can also make the condensed water flow along the condenser to the inner wall of the cylinder to clean it and prevent dust from accumulating on the inner wall of the cylinder. The elliptical cross-section of the condenser can maximize the number of condenser tubes that can be set in each row, while increasing the contact path and contact area between the flue gas and the condenser, and extending the heat exchange time. This can improve the condensation efficiency, and facilitate the condensed water to flow down from the upper surface of the condenser, and prevent dust from depositing on its upper surface. The upper end of the condenser is connected to the water outlet chamber, and the lower end is connected to the water inlet chamber. In this way, the water flows from low to high in the condenser and gradually heats up.

[0040] As an optimization, the plurality of condenser tubes 11 are divided into multiple rows in upper and lower parts, the condenser tubes in each row are evenly spaced, and the upper and lower positions of the condenser tubes in two adjacent rows are staggered.

[0041] In this way, through this distribution, the flue gas can be fully contacted with several condenser tubes, avoiding the phenomenon that the condenser tubes in the upper row just block the condenser tubes in the lower row, thereby causing the condenser tubes in the lower row to have insufficient contact with the flue gas, thereby reducing the condensation efficiency.

[0042] As an optimization, the burner mounting block, the heat exchanger shell and the heat exchange tubes are all made of copper, and the cylinder and the condenser are all made of stainless steel.

[0043] Thus, in the existing condensing boiler, in order to improve the heat exchange efficiency, the entire heat exchange tube is made of copper. However, the corrosion resistance of the heat exchange tube is poor. Long-term contact with acidic solutions is prone to produce verdigris. The heat exchange tube closer to the bottom encounters a lower flue gas temperature, and is more likely to condense and form condensed water. The hydrogen sulfide component contained in the flue gas easily reacts with water to form an acidic solution, thereby corroding the lower heat exchange tube. The present application is based on the respective characteristics of copper and stainless steel materials to form a heat exchanger and a condenser respectively. Since the heat exchanger part always passes through the heat exchange tube with high-temperature flue gas, no condensed water is generated, and no acidic solution is formed, which does not cause corrosion to the heat exchange tube. The condensed water generated in the condenser will react with hydrogen sulfide in the flue gas to form an acidic solution. However, since the condenser is made of stainless steel, it has the advantage of corrosion resistance and is not afraid of corrosion by acidic solutions, thus improving the durability and service life of the equipment.

[0044] As an optimization, the heat exchanger shell is cylindrical as a whole, the burner mounting block is arranged at the upper center of the heat exchanger shell, the bottom of the burner mounting block is a spherical structure protruding downward, and a plurality of heat exchange tubes 5 are vertically arranged between the outer surface of the bottom of the burner mounting block and the inner surface of the bottom of the heat exchanger shell to support the burner mounting block and pass the high-temperature flue gas.

[0045] In this way, the bottom of the combustion chamber presents a spherical structure protruding downward, which is conducive to the downward gathering of high-temperature flue gas generated by the burner and being blown into the heat exchange tube by the burner's fan, thereby improving the heat exchange efficiency.

[0046] As an optimization, there is a gap between the top surface and the side surface of the burner mounting block and the inner wall of the heat exchanger shell, and the gap is connected to the heat exchange chamber. The second water outlet is arranged at the top of the heat exchanger shell and is connected to the heat exchange chamber through the gap, and the second water inlet is arranged at the lower part of the heat exchanger shell and is connected to the heat exchange chamber.

[0047] In this way, there is no contact between the burner mounting block and the inner wall of the heat exchanger shell, and the gap between the burner mounting block and the inner wall of the heat exchanger shell is connected to the heat exchange chamber, thereby increasing the heat exchange area of ​​the heat exchange chamber and improving the heat exchange efficiency.

[0048] As an optimization, a plurality of horizontal partitions are arranged from bottom to top in the heat exchange chamber to form an S-shaped water path from the second water inlet to the second water outlet.

[0049] In this way, by setting up multiple horizontal partitions to form an S-shaped water channel, water flowing into the heat exchange chamber from the bottom can be fully in contact with the heat exchange tubes and the burner mounting block before flowing out through the second water outlet at the top, thereby increasing the contact time between the water and the heat exchange tubes and the burner mounting block and improving the heat exchange efficiency.

[0050] Openings are provided at corresponding positions on the top of the burner mounting block and the top of the heat exchanger shell. The burner is sealed and mounted on the burner mounting block through the openings. The smoke-generating end of the burner is located in the combustion chamber, and the air inlet end extends out of the heat exchanger shell.

Claims

1. A full premix condensing boiler, comprising a burner and a heat exchanger, characterized in that: The heat exchanger comprises a heat exchanger shell, a burner mounting block is arranged inside the heat exchanger shell, a combustion chamber is opened inside the burner mounting block, the smoke-generating end of the burner is arranged in the combustion chamber and generates high-temperature flue gas, a plurality of heat exchange tubes are connected between the bottom of the burner mounting block and the inner bottom surface of the heat exchanger shell, and the heat exchange chamber is formed by the gap between the heat exchange tubes and the burner mounting block and the inside of the heat exchanger shell, a condenser is arranged at the bottom of the heat exchanger shell, and the condenser comprises a cylinder body, and the cylinder body passes through and forms a condensation channel from top to bottom, one end of the heat exchange tube is connected to the combustion chamber in the burner mounting block and the other end is connected to the condensation channel, a water inlet chamber and a water outlet chamber are opened in the interlayer between the outer wall of the cylinder body and the inner wall formed by the condensation channel, and a plurality of transverse chambers are connected between the water inlet chamber and the water outlet chamber. A condenser tube is placed in the condensation channel, and both ends of the condenser tube are connected to the water inlet chamber and the water outlet chamber respectively. The water inlet chamber is provided with a first water inlet, and the water outlet chamber is provided with a first water outlet. The heat exchange chamber is provided with a second water inlet connected to the first water outlet and a second water outlet connected to the outside. A flue gas discharge port connected to the condensation channel is also provided at the bottom of the cylinder body. The high-temperature flue gas enters the condensation channel through the heat exchange tube and is condensed and cooled through the condenser tube with cold water flowing therein, and then discharged from the flue gas discharge port. The cold water to be heated flows into the heat exchange chamber through the first water inlet, the water inlet chamber, the condenser tube, the water outlet chamber, the first water outlet, and the second water inlet in turn, and is heated and discharged from the second water outlet through the outer wall of the heat exchange tube and the outer wall of the burner mounting block with the high-temperature flue gas generated by the burner to obtain the required hot water. The cross section of the condensation channel is circular, and the condensation channel and the cylinder share a central axis; The heat exchanger shell is cylindrical as a whole, the burner mounting block is arranged at the center of the upper part of the heat exchanger shell, the bottom of the burner mounting block is a spherical structure protruding downward, and a plurality of heat exchange tubes are vertically arranged between the outer surface of the bottom of the burner mounting block and the inner surface of the bottom of the heat exchanger shell to support the burner mounting block and pass the high-temperature flue gas; The top surface and the side surface of the burner mounting block are both provided with a gap with the inner wall of the heat exchanger shell, and the gap is communicated with the heat exchange chamber, the second water outlet is arranged at the top of the heat exchanger shell and is communicated with the heat exchange chamber through the gap, and the second water inlet is arranged at the lower part of the heat exchanger shell and is communicated with the heat exchange chamber; A plurality of horizontal partitions are arranged in the heat exchange chamber from bottom to top to form an S-shaped water channel from the second water inlet to the second water outlet.

2. A fully premixed condensing boiler according to claim 1, characterized in that: The condensers are provided with a plurality of condensers which are stacked up and down, and the central axes of the condensation channels of all the condensers are located on the same straight line. The first water outlet of the condenser on the uppermost layer is connected with the second water inlet, and the first water inlet of the condenser on the lower layer is connected with the first water inlet of the condenser on the upper layer.

3. A fully premixed condensing boiler according to claim 1, characterized in that: An annular sealed chamber is provided in the interlayer between the outer wall of the cylinder and the inner wall formed by the condensation channel. Two vertical partitions are provided in the sealed chamber to divide it into two independent cavities on the left and right, one of which is a water inlet chamber and the other is a water outlet chamber.

4. A fully premixed condensing boiler according to claim 1, characterized in that: The plurality of condensing tubes are arranged in parallel at intervals and have an angle of 6 to 10 degrees with the horizontal plane, and the cross-section of the condensing tube is elliptical, and the long axis thereof is arranged vertically.

5. A fully premixed condensing boiler according to claim 4, characterized in that: The plurality of condensing tubes are divided into a plurality of upper and lower rows, the condensing tubes in each row are evenly spaced, and the upper and lower positions of the condensing tubes between two adjacent rows are staggered.

6. A fully premixed condensing boiler according to claim 1, characterized in that: The burner mounting block, the heat exchanger shell and the heat exchange tube are all made of copper, and the cylinder and the condenser tube are all made of stainless steel.

Images