High-capacity SH type low-nitrogen efficient gas-fired hot water boiler

Abstract

The utility model discloses a high-capacity SH type low-nitrogen efficient gas-fired hot water boiler, and belongs to the field of gas-fired hot water boilers. A high-capacity SH type low-nitrogen efficient gas-fired hot water boiler comprises a longitudinally-arranged hearth and further comprises an ultra-low-nitrogen combustor arranged at one end of the longitudinally-arranged hearth, a low-nitrogen combustor arranged at the other end of the longitudinally-arranged hearth and a gas-fired boiler arranged at the other end of the The SH type convection heating surface is arranged at one end, far away from the ultra-low nitrogen combustor, of the longitudinal hearth; the energy saver is arranged on one side of the SH type convection heating surface, and the smoke inlet end of the energy saver is communicated with the longitudinally-arranged hearth; the condenser is arranged on one side, far away from the SH type convection heating surface, of the energy saver; the air preheater is arranged on one side, far away from the energy saver, of the condenser; the heat efficiency of the boiler is effectively improved, the fuel consumption is reduced, the energy-saving effect is achieved, and heat can be effectively absorbed by adopting the SH type convection heating surface.

Description

TECHNICAL FIELD

[0001] The utility model relates to gas hot water boiler technical field especially relates to a large capacity SH type low nitrogen efficient gas hot water boiler. BACKGROUND

[0002] Natural gas is selected as clean energy as clean and efficient fuel.

[0003] But natural gas price is relatively expensive, can improve the thermal efficiency of boiler, reduce fuel consumption and further reduce the use cost, it is particularly important for natural gas combustion, low calorific value and high calorific value difference 10% or so, because fuel contains a large amount of hydrogen element, combustion produces a large amount of water vapor.

[0004] If the flue gas temperature is low enough, the water vapor in the flue gas in the superheated state will condense into liquid water and release latent heat of vaporization, which can improve the thermal efficiency of the boiler, thereby saving natural gas energy, and further put forward a large capacity SH type low nitrogen efficient gas hot water boiler. UTILITY MODEL CONTENT

[0005] The technical problem to be solved by the utility model is to overcome the deficiencies of the prior art, and provide a large capacity SH type low nitrogen efficient gas hot water boiler which can overcome the above problems or at least partially solve the above problems.

[0006] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0007] A large capacity SH type low nitrogen efficient gas hot water boiler, comprising: a longitudinal furnace, further comprising: an ultra-low nitrogen burner arranged at one end of the longitudinal furnace; an SH type convection heating surface arranged at the end of the longitudinal furnace away from the ultra-low nitrogen burner; an economizer arranged on one side of the SH type convection heating surface, and the smoke inlet end of the economizer is communicated with the longitudinal furnace; a condenser arranged on the side of the economizer away from the SH type convection heating surface; an air preheater arranged on the side of the condenser away from the economizer; a water outlet mixing header arranged on the upper side of the longitudinal furnace; a flue gas recirculation system arranged on the lower side of the longitudinal furnace, one end of the flue gas recirculation system is arranged between the economizer and the condenser, and the output end of the flue gas recirculation system is arranged at the ultra-low nitrogen burner.

[0008] Preferably, the lower side of the longitudinal furnace is provided with a body support.

[0009] In order to facilitate subsequent modular assembly, further, the longitudinal furnace, the SH type convection heating surface, the economizer, the condenser and the air preheater are all modularly arranged.

[0010] In order to facilitate the improvement of the rigidity of the whole membrane water cooled wall, preferably, one side of the longitudinal furnace is provided with a rigid beam.

[0011] In order to prevent the heating surface from being corroded, further, the economizer, the condenser and the air preheater are all provided with a condensate drainage device below.

[0012] Compared with the prior art, the utility model provides a kind of large capacity SH type low-nitrogen high-efficiency gas hot water boiler, with the following beneficial effects:

[0013] 1、The large capacity SH type low-nitrogen high-efficiency gas hot water boiler, natural gas fuel is combusted by ultra-low nitrogen combustor, longitudinal furnace absorbs the radiation heat of flame, high-temperature flue gas is exchanged by SH type convection heating surface, and then exchanged by economizer, flue gas enters the heating surface of condenser and air preheater to reduce the boiler flue gas temperature to below 60 DEG C, the boiler flue gas temperature is designed below 60 DEG C, which improves the boiler thermal efficiency and reduces fuel consumption to achieve energy-saving effect.

[0014] 2、The large capacity SH type low-nitrogen high-efficiency gas hot water boiler, by adopting SH type convection heating surface, modular SH type convection heating surface is used at the furnace outlet position where the flue gas temperature exceeds 1000 DEG C, which can effectively absorb heat, replace the original non-water-cooled alloy steel plate structure, greatly reduce the cost, and improve the service life.

[0015] 3、The large capacity SH type low-nitrogen high-efficiency gas hot water boiler, the whole water circulation loop of the boiler is forced circulation, which ensures the safety of the boiler operation, and the reasonable flow rate is adopted to control the whole water resistance within 0.1 MPa, which reduces the operating power of the circulating pump and achieves energy-saving effect.

[0016] The parts not involved in the device are the same as or can be realized by the prior art, the utility model effectively improves the boiler thermal efficiency, reduces fuel consumption, achieves energy-saving effect, and adopts SH type convection heating surface to effectively absorb heat. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 A large capacity SH type low-nitrogen high-efficiency gas hot water boiler structure diagram is provided for the utility model;

[0018] Figure 2 A large capacity SH type low-nitrogen high-efficiency gas hot water boiler whole water circulation loop diagram is provided for the utility model.

[0019] In the figure: 1, ultra-low nitrogen combustor; 2, longitudinal furnace; 3, SH type convection heating surface; 4, flue gas recirculation system; 5, economizer; 6, condenser; 7, air preheater; 8, water outlet mixing header; 9, rigid beam; 10, body support; 11, condensate drainage device. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the utility model will be apparently and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments.

[0021] Embodiment 1: Refer to Figure 1 A large-capacity SH type low-nitrogen high-efficiency gas hot water boiler, comprising: a longitudinal furnace 2, further comprising: an ultra-low nitrogen burner 1 arranged at one end of the longitudinal furnace 2; an SH type convection heating surface 3 arranged at the end of the longitudinal furnace 2 away from the ultra-low nitrogen burner 1; an economizer 5 arranged on one side of the SH type convection heating surface 3, and the smoke inlet end of the economizer 5 is in communication with the longitudinal furnace 2; a condenser 6 arranged on the side of the economizer 5 away from the SH type convection heating surface 3; an air preheater 7 arranged on the side of the condenser 6 away from the economizer 5; a water outlet mixing header 8 arranged on the upper side of the longitudinal furnace 2; a flue gas recirculation system 4 arranged on the lower side of the longitudinal furnace 2, one end of the flue gas recirculation system 4 is arranged between the economizer 5 and the condenser 6, and the output end of the flue gas recirculation system 4 is arranged at the ultra-low nitrogen burner 1.

[0022] Natural gas fuel is combusted by the ultra-low nitrogen burner 1, the longitudinal furnace 2 absorbs the radiant heat of the flame, the high-temperature flue gas is heat-exchanged by the SH type convection heating surface 3 and then by the economizer 5, the flue gas enters the heating surface of the condenser 6 and the air preheater 7 to reduce the boiler flue gas temperature to below 60℃, the boiler flue gas temperature is designed to be below 60℃, which improves the boiler thermal efficiency, reduces the fuel consumption and achieves energy-saving effect.

[0023] The SH type convection heating surface 3 is adopted, the modular SH type convection heating surface 3 is adopted at the furnace outlet position where the flue gas temperature exceeds 1000℃, which can effectively absorb heat and replace the original non-water-cooled alloy steel plate structure, thereby greatly reducing the cost and improving the safe service life.

[0024] The ultra-low nitrogen burner 1 and the flue gas recirculation system 4 are adopted, the flue gas recirculation technology is used to reduce NOx to below 30mg, and the air preheater 7 is arranged to avoid the condensate water problem after the recirculated flue gas is mixed with air, thereby achieving safe operation of ultra-low nitrogen.

[0025] Embodiment 2: Refer to Figure 1 A large-capacity SH type low-nitrogen high-efficiency gas hot water boiler, which is basically the same as embodiment 1, and further, the lower side of the longitudinal furnace 2 is provided with a body support 10.

[0026] The longitudinal furnace 2 is a vertical self-supporting structure of modular membrane water wall, effectively reduces the height of the boiler, does not need complex suspension steel frame, and can effectively reduce the steel consumption of the boiler.

[0027] The longitudinal furnace 2, the SH type convection heating surface 3, the economizer 5, the condenser 6 and the air preheater 7 are all modularly arranged.

[0028] In the specific implementation, the longitudinal furnace 2 is a modular "O" type membrane water wall structure, and the SH type convection heating surface 3 is arranged in a double-drum transverse manner.

[0029] The rigid beam 9 is arranged on one side of the longitudinal furnace 2, improves the rigidity of the overall membrane water wall, and solves the vibration problem caused by ultra-low nitrogen combustion.

[0030] The condensate water removal devices 11 are arranged below the economizer 5, the condenser 6 and the air preheater 7, and the corrosion problem of the heating surface is solved.

[0031] In the specific implementation, the overall flue gas flow direction is in a straight line.

[0032] The single flue gas flow direction reduces the flue gas resistance during operation, effectively reduces the operation power of the fan, and has an energy-saving effect.

[0033] Embodiment 3: Refer to Figure 2 A large-capacity SH type low-nitrogen high-efficiency gas hot water boiler, which is basically the same as that in Embodiment 1, further has that the overall water circulation circuit of the boiler is a forced circulation, which guarantees the safety of the operation of the boiler, and the reasonable flow rate is adopted to control the overall water resistance to be less than 0.1 MPa, thereby reducing the operation power of the circulating pump and having an energy-saving effect.

[0034] The above only describes the preferred specific implementation of the present application, but the protection scope of the present application is not limited to this, any skilled person in the art can make equivalent replacement or change according to the technical scheme and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.

Claims

1. A large-capacity SH type low-nitrogen high-efficiency gas hot water boiler, comprising: The longitudinal furnace (2) is characterized in that it further comprises: an ultra-low nitrogen burner (1) arranged at one end of the longitudinal furnace (2); an SH-type convection heating surface (3) arranged at the end of the longitudinal furnace (2) away from the ultra-low nitrogen burner (1); an economizer (5) arranged at one side of the SH-type convection heating surface (3), and the smoke inlet end of the economizer (5) is in communication with the longitudinal furnace (2); a condenser (6) arranged at the side of the economizer (5) away from the SH-type convection heating surface (3); an air preheater (7) arranged at the side of the condenser (6) away from the economizer (5); a water outlet mixing header (8) arranged at the upper side of the longitudinal furnace (2); a flue gas recirculation system (4) arranged at the lower side of the longitudinal furnace (2), one end of the flue gas recirculation system (4) is arranged between the economizer (5) and the condenser (6), and the output end of the flue gas recirculation system (4) is arranged at the ultra-low nitrogen burner (1).

2. A large-capacity SH type low-nitrogen high-efficiency gas hot water boiler according to claim 1, characterized in that, The lower side of the longitudinal furnace (2) is provided with a body support (10).

3. A large-capacity SH type low-nitrogen high-efficiency gas hot water boiler according to claim 2, characterized in that, The longitudinal furnace (2), the SH-type convection heating surface (3), the economizer (5), the condenser (6) and the air preheater (7) are all arranged in a modular manner.

4. A large-capacity SH type low-nitrogen high-efficiency gas hot water boiler according to claim 1, characterized in that, One side of the longitudinal furnace (2) is provided with a rigid beam (9).

5. A large-capacity SH type low-nitrogen high-efficiency gas hot water boiler according to claim 3, characterized in that, The lower sides of the economizer (5), the condenser (6) and the air preheater (7) are all provided with condensate removal devices (11).

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