CN211450920U - Porous medium burning low-nitrogen gas boiler system and heat exchange system - Google Patents

Abstract

The utility model discloses a porous medium burning low-nitrogen gas boiler system and a heat exchange system, which comprises a burning mechanism and a boiler mechanism, wherein the burning mechanism comprises a gas supply system, an air supply system, a premixing device and a burning head, the gas supply system and the air supply system are connected with the premixing device through pipelines, and the premixing device is provided with a premixing cavity; the boiler mechanism comprises a boiler body, wherein a radiation plate is arranged in the boiler body, the boiler body is divided into a radiation cavity and a heat exchange cavity by the radiation plate, a combustion head is communicated with the radiation cavity, a water tank is arranged in the heat exchange cavity, and a heat exchanger is arranged in the water tank. The utility model has the advantages that the radiation plate is arranged in the furnace body, so that the heat generated by the combustion head during combustion heats the water in the water tank through the radiation cavity; meanwhile, the heat exchanger is arranged in the water tank, stable infrared radiation heating and efficient heat exchange are realized, and the aims of reducing nitrogen oxide emission and improving combustion efficiency are fulfilled.

Description

Porous medium burning low-nitrogen gas boiler system and heat exchange system

Technical Field

The utility model belongs to the technical field of the boiler technique and specifically relates to a porous medium burning low-nitrogen gas boiler system and heat transfer system are related to.

Background

With the rapid development of economy and the continuous increase of fossil energy consumption, the environmental pollution of China is continuously intensified, wherein the ultralow emission of nitrogen oxides (NOx) is the central importance of atmospheric pollution control. The boiler is an important source of nitrogen oxide emission, strict boiler emission standards are established everywhere, and low-nitrogen combustion technology is suitable for boiler nitrogen oxide emission control. At present, the mainstream low-nitrogen combustion technology such as flue gas circulating combustion, staged combustion and blue flame combustion technology has the defects of substandard emission, instability, multiple potential safety hazards, efficiency sacrifice and the like.

The porous medium combustion is a combustion mode of gas and air reacting in the medium, and compared with free combustion, the combustion mode has the advantages of high combustion rate, good stability, uniform heat evolution, no local high temperature, low nitrogen oxide emission, high energy density, large load regulation range, small equipment volume, obvious energy-saving effect and capability of realizing the stable combustion of low-calorific-value gas. Based on the boiler design of the porous medium combustor, the prior patent, such as patent No. 201621039900.8, discloses a porous medium gas-fired boiler, but because the water chamber directly contacts with the porous medium, the problems of cracking of the medium material, damage to the outer wall of the water chamber and the like are easily caused, and meanwhile, the structure is too complex, the practicability is poor and the manufacturing cost is high; patent No. 201820489550.8 discloses a combustor and gas boiler system for gas boiler, but its combustor radiating surface can not penetrate furnace directly, and heat exchange efficiency is low, and the burning head is the cylinder structure simultaneously, and the structure is complicated, and power is on the low side, and the practicality is poor.

SUMMERY OF THE UTILITY MODEL

Based on this, it is necessary to provide a porous medium burning low-nitrogen gas boiler system and heat transfer system to the not enough of prior art, realizes stabilizing infrared radiation heating and high-efficient heat transfer, reaches the purpose that reduces nitrogen oxide and discharge, improve combustion efficiency.

In order to solve the technical problem, the utility model discloses the technical scheme who adopts is: a porous medium combustion low-nitrogen gas boiler system comprises a combustion mechanism and a boiler mechanism, wherein the combustion mechanism comprises a gas supply system, an air supply system, a premixing device and a combustion head, the gas supply system and the air supply system are connected with the premixing device through pipelines, the premixing device is provided with a premixing cavity, the combustion head comprises a shell, the shell is surrounded to form a combustion chamber, and the premixing cavity is connected with the combustion chamber through a pipeline; the boiler mechanism comprises a boiler body, wherein a radiation plate is arranged in the boiler body, the radiation plate divides the boiler body into a radiation cavity and a heat exchange cavity, a combustion head is communicated with the radiation cavity, a water tank is arranged in the heat exchange cavity, a heat exchanger is arranged in the water tank, one end of the heat exchanger is communicated with the radiation cavity, and the other end of the heat exchanger is communicated with an external smoke exhaust pipe after penetrating through the boiler body.

In one embodiment, the bottom end of the combustion chamber is provided with an air equalizing chamber, the premixing cavity is connected with the air equalizing chamber through a pipeline, an air equalizing plate is arranged in the air equalizing chamber, the combustion chamber is sequentially provided with a guide plate, an anti-backfire plate and a porous medium plate above the air equalizing chamber, one side of the lower end of the porous medium plate is provided with a temperature measuring device, and the upper end of the porous medium plate is respectively provided with an ignition electrode and a flame monitoring electrode.

In one embodiment, the furnace body is internally provided with a heat preservation layer which covers the outer side of the water tank.

In one embodiment, the premixing device is a multi-channel cross premixing structure, and the premixing device is used for performing disturbance mixing on combustion air and fuel gas in a crossing manner at a preset included angle, wherein the preset included angle is 30-70 degrees.

In one embodiment, the heat exchanger is a tubular heat exchanger, the heat exchangers are distributed in the water tank in a U-shaped arrangement, and radiating fins are uniformly distributed on the outer side edge of the heat exchanger;

or, the heat exchanger is a plate heat exchanger, and the plate heat exchanger and the radiation plate are arranged in parallel.

In one embodiment, the radiation plate is of a wavy curved surface or a sawtooth surface configuration.

In one embodiment, the porous medium plate has a pore density of 10PPI to 60PPI and a porosity of 20% to 80%.

In one embodiment, the water tank is connected with a water inlet pipe and a water outlet pipe, and the water inlet pipe and the water outlet pipe respectively penetrate through the furnace body.

In one embodiment, the gas supply system comprises a gas automatic regulating valve, a gas pressure sensor, an electromagnetic valve and an anti-backfire device, and the air supply system comprises a fan, an air regulating valve and an air pressure sensor.

The utility model provides a heat exchange system, its includes boiler mechanism and combustion head, boiler mechanism includes the furnace body, be provided with the radiation board in the furnace body, the radiation board separates the furnace body for radiation chamber and heat transfer chamber, combustion head and radiation chamber intercommunication, the heat transfer intracavity is provided with the water tank, be provided with the heat exchanger in the water tank, heat exchanger one end and radiation chamber intercommunication, the heat exchanger other end runs through the outside pipe of discharging fume of intercommunication behind the furnace body.

To sum up, the porous medium combustion low-nitrogen gas boiler system and the heat exchange system of the utility model divide the furnace body into the radiation cavity and the heat exchange cavity by arranging the radiation plate in the furnace body, and the combustion head is communicated with the radiation cavity in a matching way, so that the heat generated by the combustion of the gas by the combustion head heats the water in the water tank in an infrared radiation way through the radiation cavity; simultaneously, set up the heat exchanger in the water tank, cooperation heat exchanger and radiation chamber intercommunication setting for the high temperature flue gas that the burning head burning produced passes through the heat exchanger and discharges, and accomplish the heat transfer process with the water in the water tank, realize stabilizing infrared radiation heating and high-efficient heat transfer, reach the purpose that reduces nitrogen oxide and discharge, improve combustion efficiency.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

Fig. 1 is a schematic structural diagram of a porous medium combustion low-nitrogen gas boiler system according to a first embodiment of the present invention;

fig. 2 is a schematic structural diagram of a porous medium combustion low-nitrogen gas boiler system according to a second embodiment of the present invention;

fig. 3 is a schematic structural diagram of a porous medium combustion low-nitrogen gas boiler system according to a third embodiment of the present invention;

fig. 4 is a schematic structural diagram of a porous medium combustion low-nitrogen gas boiler system according to a fourth embodiment of the present invention;

fig. 5 is a schematic structural diagram of the burner head of the present invention.

Description of the main element symbols:

100-a combustion mechanism; 110-a controller; 120-a gas supply system; 130-an air supply system; 140-a premixing device; 150-a burner head; 151-a housing; 152-a combustion chamber; 153-gas homogenizing chamber; 154-gas homogenizing hole plate; 155-a baffle; 156-a flashback-preventing disc; 157-porous dielectric slab; 158-temperature measuring device; 1591-ignition electrode; 1592-flame monitoring electrode; 200-a boiler mechanism; 210-a furnace body; 220-a radiation plate; 230-a radiation cavity; 240-heat exchange chamber; 250-a water tank; 251-a water inlet pipe; 252-a water outlet pipe; 260-a heat exchanger; 261-heat dissipation fins; 270-an insulating layer; 300-control system.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

As shown in fig. 1 to 5, the utility model relates to a porous medium burning low-nitrogen gas boiler system includes a combustion mechanism 100 and a boiler mechanism 200, the combustion mechanism 100 includes a controller 110, a gas supply system 120, an air supply system 130, a premixing device 140 and a combustion head 150, the controller 110 is used for controlling the operating states of the gas supply system 120, the air supply system 130, the premixing device 140 and the combustion head 150, the gas supply system 120 is used for providing gas, the air supply system 130 is used for providing combustion air, the gas supply system 120 includes a gas automatic regulating valve, a gas pressure sensor, an electromagnetic valve and an anti-backfire device, and is used for monitoring the using state of the gas and preventing backfire, which is a known construction and need not be described herein; the gas supply system 120 further includes a filter, a pressure regulator, and a gas fast shutoff valve, the filter is used for filtering the gas, the pressure regulator is used for adjusting the delivery pressure and flow of the gas, and the gas fast shutoff valve is used for fast shutting off the delivery of the gas.

The air supply system 130 comprises a fan, an air regulating valve and an air pressure sensor, and is used for regulating the delivery pressure and flow of air, which is a known structure and needs no description here, the premixing device 140 is a multi-channel cross premixing structure, and the premixing device 140 is used for disturbing and mixing combustion air and fuel gas in a crossing manner at a preset included angle, wherein the preset included angle is 30-70 degrees; specifically, the gas supply system 120 and the air supply system 130 are connected with the premixing device 140 through pipelines, the air supply system 130 delivers combustion-supporting air into the premixing device 140 through a first pipeline, the gas supply system 120 delivers gas into the premixing device 140 through a second pipeline, the premixing device 140 is provided with a premixing cavity, the premixing cavity is provided with a gas branch pipeline and a combustion-supporting air main pipeline, the first pipeline is communicated with the combustion-supporting air main pipeline, the second pipeline is communicated with the gas branch pipeline, the gas branch pipeline is connected with the combustion-supporting air main pipeline, and the gas branch pipelines are multiple, so that gas enters the combustion-supporting air main pipeline in a multi-channel manner to enhance the mixing performance of the gas and the combustion-supporting air, and combustion is facilitated; wherein, carry the gas branch pipeline of gas and carry the contained angle between the combustion air trunk line of air for 30 ~ 70, still be provided with the whirl dish in the premixing chamber to the disturbance between reinforcing gas and the combustion air mixes, compares with other combustion technology, the utility model relates to a porous medium burning low nitrogen gas boiler system can adopt low calorific value gas to realize stable combustion as fuel.

Referring to fig. 5, the combustion head 150 includes a housing 151, the housing 151 encloses to form a combustion chamber 152, an air equalizing chamber 153 is disposed at a bottom end of the combustion chamber 152, and the premixing chamber is connected to the combustion chamber 152 through a pipeline and is used for delivering a premixed gas composed of a gas in the premixing chamber and combustion air into the combustion chamber 152 for combustion; specifically, the premixing cavity is connected with an air equalizing chamber 153 through a pipeline, an air equalizing hole plate 154 is arranged in the air equalizing chamber 153, a guide plate 155, an anti-tempering plate 156 and a porous medium plate 157 are sequentially arranged above the air equalizing chamber 153 in the combustion chamber 152, a temperature measuring device 158 is arranged on one side of the lower end portion of the porous medium plate 157, the temperature measuring device 158 is used for detecting the temperature of the lower end portion of the porous medium plate 157, an ignition electrode 1591 and a flame monitoring electrode 1592 are respectively arranged on the upper end portion of the porous medium plate 157, and specifically, the ignition electrode 1591 is arranged on one side of the porous medium plate 157 and used for achieving an ignition function; the flame monitoring electrode 1592 is arranged on the other side of the porous medium plate 157 and used for realizing a flame monitoring function, and premixed gas entering the combustion chamber 152 from the premixing cavity is combusted in the porous medium plate 157, so that heat energy is output outwards in an infrared radiation mode.

The boiler mechanism 200 includes a furnace body 210, a radiation plate 220 is disposed in the furnace body 210, the radiation plate 220 divides the furnace body 210 into a radiation cavity 230 and a heat exchange cavity 240, the burner head 150 is communicated with the radiation cavity 230, a water tank 250 is disposed in the heat exchange cavity 240, the water tank 250 is connected to a water inlet pipe 251 and a water outlet pipe 252 to circularly convey water in the water tank 250, the water inlet pipe 251 and the water outlet pipe 252 are respectively disposed to penetrate through the furnace body 210, the water inlet pipe 251 is used for conveying external cold water into the water tank 250, and the water outlet pipe 252 is used for conveying heated water to the outside to provide boiler water.

A heat exchanger 260 is arranged in the water tank 250, one end of the heat exchanger 260 is communicated with the radiation cavity 230, the other end of the heat exchanger 260 penetrates through the furnace body 210 and then is communicated with an external smoke exhaust pipe, heat generated by the combustion head 150 in the radiation cavity 230 is subjected to primary heat exchange with water in the water tank 250 through the radiation plate 220 in an infrared radiation mode, meanwhile, high-temperature smoke generated by the combustion head 150 in the radiation cavity 230 is discharged through the heat exchanger 260, and the high-temperature smoke is subjected to secondary heat exchange with the water in the water tank 250 through the heat exchanger 260, so that stable infrared radiation heating and efficient heat exchange are realized, and the purposes of reducing nitrogen oxide emission and improving combustion efficiency are achieved; compare with other boiler systems that adopt naked light combustion technology, the utility model relates to a porous medium burning low-nitrogen gas boiler system's heat exchange efficiency is high, simple structure, small, and is with low costs.

In one embodiment, the heat exchanger 260 is a tubular heat exchanger, the heat exchanger 260 is distributed in the water tank 250 in a U-shaped arrangement, the heat exchanger 260 is a finned type, that is, the heat radiating fins 261 are uniformly distributed on the outer edge of the heat exchanger 260, the heat exchange area between the heat exchanger 260 and the water in the water tank 250 is increased by the action of the heat radiating fins 261, and the heat exchange efficiency is effectively increased.

In one embodiment, an insulating layer 270 is disposed in the furnace body 210, and the insulating layer 270 covers the outer side of the water tank 250 to insulate the water tank 250, so as to prevent the heat loss in the water tank 250 from degrading the quality of the water for the boiler.

In one embodiment, the cross section of the radiation plate 220 is a wave-shaped curved surface or a sawtooth surface, which increases the contact area between the radiation plate 220 and the water in the water tank 250, and further increases the infrared radiation efficiency to the water.

In one embodiment, the temper resistant disc 156 is a mesh-like flat plate construction, and in particular, the flat plate construction used for the temper resistant disc 156 includes, but is not limited to, ceramic fiber plate, refractory alloy mesh, and the like.

In one embodiment, the porous density of the porous dielectric plate 157 is 10PPI to 60PPI, the porosity is 20% to 80%, and the pore density of the porous dielectric plate 157 is distributed from large to small or in a gradient manner along the airflow advancing direction.

In one embodiment, the porous medium combustion low-nitrogen gas boiler system further comprises a control system 300, wherein the control system 300 is used for controlling the combustion mechanism 100 and the boiler mechanism 200 to control and manage the temperature, the pressure, the flow, the valve switch and the like of each part of the boiler system, and specifically, the control system is used for controlling and managing one of the control systems 300 which can adopt PLC, FCS, DCS and the like.

The utility model also provides a heat transfer system, including above-mentioned boiler mechanism 200 and the combustion head 150 of a porous medium burning low-nitrogen gas boiler system, combustion head 150 and boiler mechanism 200 intercommunication setting.

Other technical characteristics of the heat exchange system are the same as those of the porous medium combustion low-nitrogen gas boiler system, and are not repeated herein.

In order to make the technical solution of the present invention clearer, a plurality of preferred embodiments are described below.

Example one

As shown in fig. 1, the porous medium combustion low-nitrogen gas boiler system of the present embodiment includes a combustion mechanism 100, a boiler mechanism 200 and a control system 300, the boiler mechanism 200 includes a boiler body 210, the boiler body 210 is a rectangular parallelepiped structure, a radiation plate 220 is disposed in the boiler body 210, the radiation plate 220 divides the boiler body 210 into a radiation cavity 230 and a heat exchange cavity 240, a water tank 250 is disposed in the heat exchange cavity 240, a heat exchange tube is disposed in the water tank 250, one end of the heat exchange tube is communicated with the radiation cavity 230, the other end of the heat exchange tube is communicated with an external smoke exhaust tube, and the boiler body 210 is filled with a heat.

The combustion mechanism 100 comprises a controller 110, a gas supply system 120, an air supply system 130, a premixing device 140 and a combustion head 150, wherein the combustion head 150 is fixedly arranged at the bottom end part of a furnace body 210, the controller 110 adopts a Siemens gas combustion engine controller 110, and the gas supply system 120 comprises a filter, a pressure regulator, a gas quick shutoff valve, a gas automatic regulating valve, a gas pressure sensor, an electromagnetic valve and a flame arrester, so that gas filtration, pressure regulation, quick shutoff and flow regulation are realized, and backfire is prevented.

The air supply system 130 comprises a fan, an automatic air regulating valve and an air pressure sensor, and realizes the pressure regulation and the flow regulation of combustion air; the premixing device 140 adopts a four-channel cross premixing structure, and disturbs and mixes air and gas in a tangential manner at an included angle of 45 degrees, and is provided with a pair of forward and reverse rotational flow disks to strengthen the disturbed mixing.

The combustion head 150 is a cuboid structure and is composed of a shell 151, a gas equalizing chamber 153, a combustion chamber 152, a temperature measuring device 158, an ignition electrode 1591 and a flame monitoring electrode 1592. The bottom end of the combustion head 150 is provided with a gas-equalizing chamber 153, and a guide plate 155 and a gas-equalizing hole plate 154 are arranged in the combustion head 150 so as to uniformly guide the premixed gas into the combustion chamber 152; an anti-tempering disc 156, a small-aperture porous medium plate 157 and a large-aperture porous medium plate 157 are sequentially arranged in the combustion chamber 152, the anti-tempering disc 156 is a mesh ceramic fiber flat plate, a temperature measuring device 158 is placed in the small-aperture porous medium plate 157 to monitor the temperature of the small-aperture porous medium plate 157, and an ignition electrode 1591 and a flame monitoring electrode 1592 are placed at the rear end of the large-aperture porous medium plate 157 to realize ignition and flame monitoring; the premixed gas is combusted in the large-aperture medium plate in the combustion chamber 152, and heat is output outwards in an infrared radiation mode.

The small-aperture porous dielectric plate 157 adopts alumina honeycomb ceramics, the pore density is 40PPI, and the porosity is 30%; the large-aperture porous medium plate 157 adopts silicon carbide porous ceramic, the pore density is 10PPI, and the porosity is 60%.

The boiler mechanism 200 comprises a furnace body 210, a radiation plate 220 is arranged in the furnace body 210, the radiation plate 220 divides the furnace body 210 into a radiation cavity 230 and a heat exchange cavity 240, a combustion head 150 is communicated with the radiation cavity 230, a water tank 250 is arranged in the heat exchange cavity 240, the radiation plate 220 is arranged on the bottom end face of the water tank 250, the bottom end face of the water tank 250 is a radiation surface, the heat exchanger 260 is a tubular heat exchanger and is distributed in the water tank 250 in a U-shaped arrangement, one end of the heat exchanger 260 is communicated with the radiation cavity 230, the other end of the heat exchanger 260 is communicated with an external smoke exhaust pipe, heat generated by the combustion head 150 in the radiation cavity 230 completes primary heat exchange on water in the water tank 250 through the radiation surface of the water tank 250 in an infrared radiation mode, high-temperature smoke in the radiation cavity 230 is discharged through the heat exchanger; in order to increase the heat exchange area, the section of the radiation plate 220 is a wave-shaped curved surface, and the heat exchange tube is a finned tube; compared with other combustion technologies, the utility model relates to a porous medium burning low-nitrogen gas boiler system has advantages such as heat utilization efficiency is high, pollutant discharge is few and stable, boiler load regulation ratio is big.

The control system 300 adopts a DCS system with redundant configuration to control and manage the temperature, pressure, piping valves, and the like in the water tank 250.

Example two

As shown in fig. 2, it is different from the first embodiment in that: the heat exchanger 260 is a plate heat exchanger 260, the heat exchanger 260 and the radiation plate 220 are arranged in parallel, the whole U-shaped structure of the heat exchanger 260 is distributed in the water tank 250, and the cross section of the radiation plate 220 is designed to be a zigzag structure for increasing the heat exchange area.

EXAMPLE III

As shown in fig. 3, it is different from the first embodiment in that: the radiation plate 220 divides the furnace body 210 into a heat exchange cavity 240 and two radiation cavities 230, the radiation cavities 230 are arranged on two sides of the water tank 250, so that the water tank 250 has two radiated surfaces, water in the water tank 250 is heated by adopting a double-side heating mode, and the combustion heads 150 are arranged on two symmetrical sides of the furnace body 210.

Example four

As shown in fig. 4, it is different from the first embodiment in that: the four burner heads 150 are uniformly fixed at the bottom of the furnace body 210 of the boiler mechanism 200, the premixed gas is uniformly distributed into the four burner heads 150, and a premixed gas control valve is mounted in front of each burner head 150 and can independently control the working state of the corresponding burner head 150.

To sum up, the porous medium combustion low-nitrogen gas boiler system and the heat exchange system of the present invention divide the furnace body 210 into the radiation chamber 230 and the heat exchange chamber 240 by disposing the radiation plate 220 in the furnace body 210, and cooperatively, the combustion head 150 is disposed in communication with the radiation chamber 230, so that the heat generated by the combustion of the gas by the combustion head 150 heats the water in the water tank 250 in the form of infrared radiation via the radiation chamber 230; meanwhile, the heat exchanger 260 is arranged in the water tank 250, and the heat exchanger 260 is matched with the radiation cavity 230 for communicating with the radiation cavity, so that high-temperature flue gas generated by combustion of the combustion head 150 is discharged through the heat exchanger 260, and a heat exchange process is completed with water in the water tank 250, stable infrared radiation heating and efficient heat exchange are realized, and the purposes of reducing nitrogen oxide emission and improving combustion efficiency are achieved.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Although embodiments of the present invention have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art without departing from the scope of the present invention.

Claims (10)

1. The utility model provides a porous medium burning low-nitrogen gas boiler system which characterized in that: the boiler comprises a combustion mechanism and a boiler mechanism, wherein the combustion mechanism comprises a gas supply system, an air supply system, a premixing device and a combustion head, the gas supply system and the air supply system are connected with the premixing device through pipelines, the premixing device is provided with a premixing cavity, the combustion head comprises a shell, the shell is surrounded to form a combustion chamber, and the premixing cavity is connected with the combustion chamber through a pipeline; the boiler mechanism comprises a boiler body, wherein a radiation plate is arranged in the boiler body, the radiation plate divides the boiler body into a radiation cavity and a heat exchange cavity, a combustion head is communicated with the radiation cavity, a water tank is arranged in the heat exchange cavity, a heat exchanger is arranged in the water tank, one end of the heat exchanger is communicated with the radiation cavity, and the other end of the heat exchanger is communicated with an external smoke exhaust pipe after penetrating through the boiler body.

2. The porous medium combustion low-nitrogen gas-fired boiler system according to claim 1, wherein: the combustor bottom end portion is provided with the gas homogenizing chamber, the premixing chamber passes through the pipeline and is connected with the gas homogenizing chamber, be provided with the gas homogenizing plate in the gas homogenizing chamber, the combustor has set gradually guide plate, fire-proof set and porous medium board in the gas homogenizing chamber top, porous medium board tip one side is provided with temperature measuring device under the porous medium board, porous medium board upper end part is provided with ignition electrode and flame monitoring electrode respectively.

3. A porous medium fired low nitrogen gas fired boiler system according to claim 1 or 2 characterized by: the furnace body is internally provided with a heat preservation layer which covers the outer side part of the water tank.

4. A porous medium fired low nitrogen gas fired boiler system according to claim 1 or 2 characterized by: the premixing device is of a multichannel cross premixing structure and is used for performing disturbance mixing on combustion air and fuel gas in a mode of intersecting a preset included angle, wherein the preset included angle is 30-70 degrees.

5. A porous medium fired low nitrogen gas fired boiler system according to claim 1 or 2 characterized by: the heat exchanger is a tubular heat exchanger, the heat exchangers are distributed in the water tank in a U-shaped arrangement mode, and radiating fins are uniformly distributed on the outer side edge of the heat exchanger;

or, the heat exchanger is a plate heat exchanger, and the plate heat exchanger and the radiation plate are arranged in parallel.

6. A porous medium fired low nitrogen gas fired boiler system according to claim 1 or 2 characterized by: the radiation plate is in a wave-shaped curved surface or sawtooth surface structure.

7. The porous medium combustion low-nitrogen gas-fired boiler system according to claim 2, characterized in that: the porous medium plate has the pore density of 10-60 PPI and the porosity of 20-80%.

8. A porous medium fired low nitrogen gas fired boiler system according to claim 1 or 2 characterized by: the water tank is connected with a water inlet pipe and a water outlet pipe, and the water inlet pipe and the water outlet pipe respectively penetrate through the furnace body.

9. A porous medium fired low nitrogen gas fired boiler system according to claim 1 or 2 characterized by: the gas supply system comprises a gas automatic regulating valve, a gas pressure sensor, an electromagnetic valve and an anti-backfire device, and the air supply system comprises a fan, an air regulating valve and an air pressure sensor.

10. A heat exchange system, characterized in that: the boiler comprises a boiler mechanism and a combustion head, wherein the boiler mechanism comprises a boiler body, a radiation plate is arranged in the boiler body, the boiler body is divided into a radiation cavity and a heat exchange cavity by the radiation plate, the combustion head is communicated with the radiation cavity, a water tank is arranged in the heat exchange cavity, a heat exchanger is arranged in the water tank, one end of the heat exchanger is communicated with the radiation cavity, and the other end of the heat exchanger is communicated with an external smoke exhaust pipe after penetrating through the boiler body.

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