Horizontal water pipe gas-steam boiler

Abstract

The utility model discloses a horizontal water pipe gas-steam boiler which comprises a boiler body, a burner, an energy saver, a lower boiler barrel, a heat exchange pipe assembly and an upper boiler barrel, a hearth is arranged in the boiler body, the burner is used for jetting flames into the hearth, the hearth is provided with a smoke outlet, and the smoke outlet is connected with the energy saver; the two ends of the heat exchange pipe assembly communicate with the upper boiler barrel and the lower boiler barrel correspondingly, the heat exchange pipe assembly is arranged in the hearth, the heat exchange pipe assembly divides the inner space of the hearth into a bent rotary flue, and the rotary flue communicates with the smoke outlet. The heat exchange pipe assembly is directly arranged in the hearth, the heat exchange pipe assembly divides the inner space of the hearth into the bent rotary flue, high-temperature flames and high-temperature smoke generated by the combustor can directly act on the heat exchange pipe assembly, water in the heat exchange pipe assembly is heated in a radiation heat transfer and convective heat transfer mode, and the heat exchange efficiency is improved. And the heat exchange tube assembly can quickly generate steam.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of boiler, concretely relates to a horizontal water pipe gas steam boiler. BACKGROUND

[0002] The boiler is a kind of energy conversion equipment, and the energy input into the boiler includes chemical energy in fuel and electric energy, and the boiler outputs steam, high-temperature water or organic heat carrier with certain heat energy.Boiler is originally used to refer to a water container heated on a fire, and furnace refers to a place for burning fuel, so the boiler includes two parts, i.e., the pot and the furnace.The hot water or steam generated in the boiler can directly provide the required heat energy for industrial production and people's life.After water enters the boiler, the heat absorbed by the boiler heating surface is transferred to the water in the steam-water system, so that the water is heated to hot water or steam of a certain temperature and pressure, which is led out for application.At the same time, the fuel combustion continuously releases heat, and the high-temperature flue gas generated by combustion transfers heat to the boiler heating surface, and the temperature of the flue gas gradually decreases, and finally the flue gas is discharged from the chimney.

[0003] The WNS micro-superheated steam boiler disclosed in the above-mentioned patent document comprises a turning flue and a superheater, the superheater comprises a box body, a steam inlet header, a steam outlet header and heat exchange coil groups, the steam inlet header is connected in communication with the steam outlet header through the heat exchange coil groups, and each heat exchange coil group is arranged in sequence from top to bottom and forms a smoke passing channel.The WNS micro-superheated steam boiler combines the turning flue and the superheater, places the superheater outside the boiler body, and arranges the heating surface of the superheater, which is no longer restricted by the internal space of the front smoke box, so that the heat exchange area of the superheater can be flexibly increased or reduced according to requirements, the heat exchange coil groups of the superheater are arranged in sequence from top to bottom and form a smoke passing channel, the problem of smoke flushing dead angle is solved, and the structure of the steam inlet header and the steam outlet header is matched to improve the heat exchange efficiency of the heat exchange coil groups and ensure the superheated steam temperature, so that the temperature of the superheated steam generated by the WNS micro-superheated steam boiler reaches the design value requirement.

[0004] The WNS micro-superheated steam boiler disclosed in the above-mentioned patent document utilizes the turning flue to transport high-temperature flue gas to the superheater, and then the high-temperature flue gas exchanges heat with the heat exchange coil groups in the superheater, so as to obtain steam, but this technical scheme has the problems of slow water temperature rising speed and long steam starting time. UTILITY MODEL CONTENTS

[0005] The utility model aims to provide a horizontal water pipe gas steam boiler to solve the above-mentioned problems existing in the prior art.

[0006] In order to achieve the above object, the utility model discloses the following technical scheme: a horizontal water pipe gas steam boiler, including boiler main body, combustor, economizer, lower drum, heat exchange pipe subassembly and upper drum, the inside of boiler main body is equipped with hearth, the combustor is used to the injection flame in hearth, and hearth is equipped with flue gas outlet, and the flue gas outlet is connected with economizer, the both ends of heat exchange pipe subassembly are communicated with upper drum and lower drum respectively, and heat exchange pipe subassembly sets up in hearth, and heat exchange pipe subassembly divides the inside space of hearth into the rotary flue of bending, and the rotary flue is communicated with flue gas outlet.

[0007] As an optional implementation of the above technical solution, the rotary flue includes first flue, second flue and third flue communicated in sequence, the first corner area is arranged between the first flue and the second flue, the second corner area is arranged between the second flue and the third flue, and the third flue is communicated with the flue gas outlet.

[0008] As an optional implementation of the above technical solution, the heat exchange pipe subassembly includes first heat exchange pipe group, second heat exchange pipe group and third heat exchange pipe group, one end of the first heat exchange pipe group, the second heat exchange pipe group and the third heat exchange pipe group is connected with the upper drum, the other end of the first heat exchange pipe group, the second heat exchange pipe group and the third heat exchange pipe group is connected with the lower drum, the first heat exchange pipe group and the second heat exchange pipe group are provided with the first flue, the second heat exchange pipe group and the third heat exchange pipe group are provided with the second flue, and the third heat exchange pipe group and the inner wall of the hearth are provided with the third flue.

[0009] As an optional implementation of the above technical solution, the first heat exchange pipe group includes a plurality of first tube bundles arranged side by side, the two ends of the first tube bundle are communicated with the upper drum and the lower drum respectively, and the first fin is connected between the two adjacent first tube bundles.

[0010] As an optional implementation of the above technical solution, the first tube bundle is provided with a first fin, and the first fin extends into the first flue.

[0011] As an optional implementation of the above technical solution, the second heat exchange pipe group includes a plurality of second tube bundles arranged side by side, the two ends of the second tube bundle are communicated with the upper drum and the lower drum respectively, and the second fin is arranged between the two second tube bundles outside the first corner area.

[0012] As an optional implementation of the above technical solution, the second fin is arranged on the two sides of the second tube bundle, and the second fin on the two sides of the second tube bundle extends into the first flue and the second flue respectively.

[0013] As an optional implementation form of the above technical solution, the third heat exchange pipe group comprises a plurality of third pipe bundles arranged side by side, both ends of the third pipe bundle are communicated with the upper drum and the lower drum respectively, and a third fin is arranged between two third pipe bundles located outside the second corner area.

[0014] As an optional implementation form of the above technical solution, the third pipe bundle is provided with a third fin on both sides, and the third fins on both sides of the third pipe bundle extend into the second flue and the third flue respectively.

[0015] As an optional implementation form of the above technical solution, the water outlet end of the energy saver is communicated with the lower drum.

[0016] As an optional implementation form of the above technical solution, the energy saver is connected with a condensation heat exchanger.

[0017] As an optional implementation form of the above technical solution, the upper drum is provided with a liquid level electrode cylinder and a liquid level meter.

[0018] As an optional implementation form of the above technical solution, the inner wall of the furnace is provided with refractory concrete, and the outer side of the boiler main body is provided with an aluminum silicate fiber board.

[0019] The utility model discloses a beneficial effect is:

[0020] The utility model provides a horizontal water pipe gas steam boiler, which directly sets a heat exchange pipe assembly in a furnace, and the heat exchange pipe assembly divides the internal space of the furnace into a bent rotary flue. The high-temperature flame and high-temperature flue gas generated by the burner can directly act on the heat exchange pipe assembly, heat the water in the heat exchange pipe assembly through radiation heat transfer and convection heat transfer, and make the heat exchange pipe assembly quickly generate steam. Compared with a WNS steam boiler with the same evaporation capacity, the steam boiler has the advantages of fast water temperature rising speed, short steam starting time, small water volume, energy saving, and less heat loss. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is the front structure schematic diagram of the horizontal water pipe gas steam boiler in an embodiment of the utility model;

[0022] Figure 2 is the internal structure schematic diagram of the horizontal water pipe gas steam boiler in an embodiment of the utility model;

[0023] Figure 3 is the structure schematic diagram of the heat exchange pipe assembly in an embodiment of the utility model.

[0024] In the figure: 1 - boiler main body; 2 - burner; 3 - economizer; 4 - lower drum; 5 - upper drum; 6 - hearth; 7 - flue gas outlet; 8 - rotary flue; 9 - first flue; 10 - second flue; 11 - third flue; 12 - first tube bundle; 13 - first fin; 14 - first fin; 15 - second tube bundle; 16 - second fin; 17 - second fin; 18 - third tube bundle; 19 - third fin; 20 - third fin; 21 - condensing heat exchanger; 22 - liquid level electrode cylinder; 23 - liquid level gauge; 24 - refractory concrete; 25 - aluminum silicate fiber board. DETAILED DESCRIPTION

[0025] As Figures 1-3 shown, the embodiment provides a horizontal water tube gas steam boiler, which comprises a boiler main body 1, a burner 2, an economizer 3, a lower drum 4, a heat exchange tube assembly and an upper drum 5, the inside of the boiler main body 1 is provided with a hearth 6, the inner wall of the hearth 6 is provided with refractory concrete 24, and the outer side of the boiler main body 1 is provided with aluminum silicate fiber board 25. The burner 2 is arranged on one side of the hearth 6, and the burner 2 is used for injecting flame into the hearth 6. The burner 2 can use two kinds of fuels, natural gas or fuel oil. After the fuel is mixed with air, it is ignited in the hearth 6 by the ignition of the burner 2, producing high-temperature combustion gas (i.e. flue gas), and in this process, the chemical energy of the fuel is converted into the heat energy of the high-temperature flue gas. The hearth 6 is provided with a flue gas outlet 7, which is connected with the economizer 3, so that the heat energy of the flue gas can be fully utilized. In order to further recover and utilize the heat energy of the flue gas, the economizer 3 is connected with a condensing heat exchanger 21.

[0026] As Figure 2 shown, the two ends of the heat exchange tube assembly are respectively communicated with the upper drum 5 and the lower drum 4, the upper drum 5 is provided with a liquid level electrode cylinder 22 and a liquid level gauge 23, so as to realize real-time understanding of the liquid level state of the upper drum 5. The heat exchange tube assembly is arranged in the hearth 6, and the heat exchange tube assembly divides the internal space of the hearth 6 into a bent rotary flue 8, which is communicated with the flue gas outlet 7. The water outlet end of the economizer 3 is communicated with the lower drum 4, so as to provide hot water for the lower drum 4.

[0027] The utility model directly sets up the heat exchange tube assembly in the hearth 6, and the heat exchange tube assembly divides the internal space of the hearth 6 into a bent rotary flue 8, the high-temperature flame and high-temperature flue gas generated by the burner 2 can directly act on the heat exchange tube assembly, the water in the heat exchange tube assembly is heated by the way of radiation heat transfer and convection heat transfer, so that the heat exchange tube assembly quickly generates steam. Compared with the WNS steam boiler with the same evaporation capacity, the steam boiler has the advantages of fast water temperature rising speed, short steam starting time, small water volume, energy saving, less heat loss and the like.

[0028] As Figure 3As shown, specifically, the rotary flue 8 includes a first flue 9, a second flue 10, and a third flue 11 connected in sequence. A first corner area is provided between the first flue 9 and the second flue 10, and a second corner area is provided between the second flue 10 and the third flue 11. The third flue 11 is connected to the flue gas outlet 7. The first flue 9, the second flue 10, and the third flue 11 are connected to form an S-shape. The burner 2 injects a high-temperature flame into the first flue 9, and the generated high-temperature flue gas flows along the first flue 9, the second flue 10, and the third flue 11, and finally exits from the flue gas outlet 7.

[0029] The heat exchange tube assembly includes a first heat exchange tube group, a second heat exchange tube group, and a third heat exchange tube group. One end of each of the first, second, and third heat exchange tube groups is connected to the upper boiler drum 5, and the other end of each is connected to the lower boiler drum 4. A first flue 9 is provided between the first and second heat exchange tube groups, a second flue 10 is provided between the second and third heat exchange tube groups, and a third flue 11 is provided between the third heat exchange tube group and the inner wall of the furnace 6.

[0030] like Figure 3 As shown, the first heat exchange tube assembly includes multiple first tube bundles 12 arranged side by side. Each first tube bundle 12 is made of metal, and its two ends are connected to the upper boiler drum 5 and the lower boiler drum 4, respectively. First fins 13 connect adjacent first tube bundles 12. The first fins 13 are used to seal the gap between adjacent first tube bundles 12, preventing the loss of high-temperature flue gas, and can transfer heat to the first tube bundles 12 through thermal conduction. To further improve the heat transfer effect, first fins 14 are provided on the first tube bundles 12, and the first fins 14 extend into the first flue 9.

[0031] The second heat exchange tube assembly includes multiple second tube bundles 15 arranged side by side. Each second tube bundle 15 is made of metal and its two ends are connected to the upper boiler drum 5 and the lower boiler drum 4, respectively. Second fins 16 are provided between two second tube bundles 15 located outside the first corner area. The second fins 16, like the first fins 13, have the function of blocking high-temperature flue gas and absorbing its heat. However, no second fins 16 are provided between the second tube bundles 15 located in the first corner area, allowing the high-temperature flue gas to smoothly enter the second flue 10 from the first flue 9. To further improve heat transfer, second fins 17 are provided on both sides of each second tube bundle 15, and these second fins 17 extend into the first flue 9 and the second flue 10, respectively.

[0032] The third heat exchange pipe group comprises a plurality of third pipe bundles 18 arranged side by side, the third pipe bundles 18 are made of metal pipes, the two ends of the third pipe bundles 18 are communicated with the upper drum 5 and the lower drum 4 respectively, and the third fins 19 are arranged between the two third pipe bundles 18 located outside the second corner area. The third fin 19 has the functions of blocking high-temperature flue gas and absorbing heat of the high-temperature flue gas as the first fin 13, wherein the third fin 19 is not arranged between the third pipe bundles 18 located in the second corner area, so that the high-temperature flue gas can smoothly enter the third flue 11 from the second flue 10. In order to further improve the heat transfer effect, the third pipe bundles 18 are provided with third fins 20 on both sides, and the third fins 20 on both sides of the third pipe bundles 18 respectively extend into the second flue 10 and the third flue 11.

[0033] The working process of the steam boiler comprises:

[0034] Fuel combustion: the horizontal water tube gas-steam boiler can use two kinds of fuels, natural gas or fuel oil. After the fuel is mixed with air, it is ignited in the furnace 6 by the ignition of the burner 2, generating high-temperature combustion gas (i.e. flue gas). In this process, the chemical energy of the fuel is converted into the heat energy of the high-temperature flue gas.

[0035] Heat transfer mode: (1) radiation heat transfer: the high-temperature flame directly acts on the first pipe bundle 12 and the second pipe bundle 15, so that the water temperature of the first pipe bundle 12 and the second pipe bundle 15 rapidly rises. (2) convection heat transfer: the high-temperature flue gas flows in the furnace 6, and heat is transferred to the first pipe bundle 12, the second pipe bundle 15 and the third pipe bundle 18 through convection. (3) heat conduction: the first fin 13, the second fin 16, the third fin 19, the first fin 14, the second fin 17 and the third fin 20 can all transfer heat, and the heat is transferred to the water in the metal pipe through the metal pipe.

[0036] In order to make the high-temperature flue gas smoothly discharge from the boiler, the second fin 16 is not arranged between the second pipe bundle 15 located in the first corner area, and the third fin 19 is not arranged between the third pipe bundle 18 located in the second corner area, so as to form the rotary flue 8. After the high-temperature flue gas enters the rotary flue 8, the heat is transferred to the metal pipe in the above three heat transfer modes, so that the water temperature of the metal pipe rapidly rises. After the flue gas is subjected to heat transfer, it still has a relatively high temperature. In order to improve the energy utilization efficiency, the economizer 3 is arranged to reduce the temperature of the flue gas and improve the water temperature entering the lower drum 4. The condensing heat exchanger 21 can be installed according to the needs. After the condensing heat exchanger 21 is installed, the temperature of the flue gas is further utilized, so that the water temperature at the outlet of the boiler water pump is improved, and through this process, the temperature of the flue gas can be reduced to below 60℃. In order to prevent flue gas leakage and excessive erosion during the operation of the boiler, the refractory concrete 24 is cast in the boiler system during the manufacture of the boiler; in addition, in order to reduce the heat radiation of the boiler system to the air, the boiler body 1 is wrapped with multiple layers of thermal insulation material, i.e. the aluminum silicate fiber board 25.

[0037] Water Heating and Vaporization: The boiler water system begins operation upon boiler ignition. Water from the tank, pumped by a water pump, first enters the economizer 3, then the lower drum 4. The lower drum 4 is connected to a metal pipe. As heat is continuously transferred to the metal pipe, the water temperature inside gradually rises to its boiling point. The water undergoes a phase change from liquid to gas within the metal pipe. Because the boiler's liquid and gas phases are typically under high pressure, the boiling point of water is higher than 100°C under standard atmospheric pressure. When the water reaches its boiling point, it begins to boil and transform into steam. The steam accumulates in the upper drum 5, gradually increasing in pressure to form pressurized steam. During boiler operation, the condenser heat exchanger 21 operates to increase the water temperature in the tank. The overall boiler water level is monitored via the level gauge 23. If the boiler system water level reading is incorrect, and a dangerous level is detected, the float in the level electrode cylinder 22 will drop, transmitting a signal to the boiler control system, triggering an audible and visual alarm, and then shutting down the boiler to ensure safety.

[0038] Steam delivery and use: The upper drum 5 has a steam outlet. Steam is delivered through pipelines to equipment that needs to be heated or driven to complete various industrial production processes, such as driving steam turbine generators to generate electricity in the power industry, and being used for heating, reaction, cooking and other processes in the chemical, textile and paper industries.

[0039] Compared with the prior art, the present invention has the following advantages:

[0040] 1. Compared with WNS steam boilers with the same evaporation capacity, it has the advantages of fast water temperature rise, short steam start-up time, small water volume, energy saving and less heat loss.

[0041] 2. The heating area of ​​the entire system is increased by using the first fin 14, the second fin 17, and the third fin 20, thereby improving thermal efficiency. This boiler does not have a rotary flue chamber; instead, it uses the first flue 9, the second flue 10, and the third flue 11 to form a rotary flue 8, through which the flue gas flows out of the entire boiler system.

[0042] 3. The first fin 14, the second fin 17 and the third fin 20 increase the turbulence of the flue gas and increase the resistance of the flue gas. The residence time of the flue gas in the entire boiler system is longer, thereby controlling the combustion temperature and achieving the effect of low nitrogen combustion.

[0043] 4. The boiler adopts a three-pass design, which makes full use of the heat of the high-temperature flue gas.

[0044] In the description of the utility model, the terms "mounting", "connection", "connecting", "fixing" and the like should be understood broadly, can be fixed connection, detachable connection, or integrated; can be mechanical connection or electrical connection; can be directly connected, or indirectly connected through an intermediate medium, can be the communication between two elements or the interaction relationship of two elements, for those skilled in the art, the specific meaning of the above terms in the utility model can be understood. In addition, the specific features, structures and the like described in the embodiments are included in at least one embodiment, and the features of different embodiments can be combined by those skilled in the art without mutual contradiction. The protection scope of the utility model is not limited to the above specific embodiments, according to the basic technical concept of the utility model, the embodiments that can be thought of by those skilled in the art without creative labor all belong to the protection scope of the utility model.

Claims

1. A horizontal water tube gas and steam boiler, characterized in that, The utility model provides a boiler, including boiler main body (1), burner (2), economizer (3), lower drum (4), heat exchange pipe subassembly and upper drum (5), the inside of boiler main body (1) is equipped with hearth (6), the burner (2) is used to inject flame into hearth (6), hearth (6) is equipped with flue gas outlet (7), and the flue gas outlet (7) is connected with economizer (3);The both ends of heat exchange pipe subassembly are communicated with upper drum (5) and lower drum (4) respectively, and heat exchange pipe subassembly is arranged in hearth (6), and heat exchange pipe subassembly divides the inside space of hearth (6) into the bending rotary flue (8), and the rotary flue (8) is communicated with flue gas outlet (7).

2. The horizontal gas-steam boiler with water pipes according to claim 1, characterised by the fact that The rotary flue (8) includes first flue (9), second flue (10) and third flue (11) communicated in sequence, and a first corner area is arranged between the first flue (9) and the second flue (10), a second corner area is arranged between the second flue (10) and the third flue (11), and the third flue (11) is communicated with the flue gas outlet (7).

3. The horizontal gas-steam boiler according to claim 2, characterised in that The heat exchange pipe subassembly includes a first heat exchange pipe group, a second heat exchange pipe group and a third heat exchange pipe group, one end of each of the first heat exchange pipe group, the second heat exchange pipe group and the third heat exchange pipe group is connected with the upper drum (5), the other end of each of the first heat exchange pipe group, the second heat exchange pipe group and the third heat exchange pipe group is connected with the lower drum (4), the first heat exchange pipe group and the second heat exchange pipe group are provided with the first flue (9) therebetween, the second heat exchange pipe group and the third heat exchange pipe group are provided with the second flue (10) therebetween, and the third heat exchange pipe group is provided with the third flue (11) between the third heat exchange pipe group and the inner wall of the hearth (6).

4. The horizontal gas-steam boiler according to claim 3, characterised in that The first heat exchange pipe group includes a plurality of first tube banks (12) arranged side by side, the both ends of each of the first tube banks (12) are communicated with the upper drum (5) and the lower drum (4) respectively, and a first fin (13) is arranged between two adjacent first tube banks (12).

5. The horizontal gas-steam boiler according to claim 4, characterised in that The first tube bank (12) is provided with a first fin (14) extending into the first flue (9).

6. The horizontal gas-steam boiler according to claim 3, characterised in that The second heat exchange pipe group includes a plurality of second tube banks (15) arranged side by side, the both ends of each of the second tube banks (15) are communicated with the upper drum (5) and the lower drum (4) respectively, and a second fin (16) is arranged between two second tube banks (15) located outside the first corner area.

7. The horizontal gas-steam boiler according to claim 6, characterised in that The second tube bank (15) is provided with a second fin (17) on each side thereof, and the second fin (17) on each side of the second tube bank (15) extends into the first flue (9) and the second flue (10) respectively.

8. The horizontal gas-steam boiler according to claim 3, characterised in that The third heat exchange pipe group includes a plurality of third tube banks (18) arranged side by side, the both ends of each of the third tube banks (18) are communicated with the upper drum (5) and the lower drum (4) respectively, and a third fin (19) is arranged between two third tube banks (18) located outside the second corner area.

9. The horizontal gas-steam boiler according to claim 8, characterised in that The third tube bank (18) is provided with a third fin (20) on each side thereof, and the third fin (20) on each side of the third tube bank (18) extends into the second flue (10) and the third flue (11) respectively.

10. The horizontal gas-steam boiler according to claim 1, characterised in that The water outlet end of the economizer (3) is communicated with the lower drum (4); the economizer (3) is connected with a condensing heat exchanger (21); the upper drum (5) is provided with a liquid level electrode cylinder (22) and a liquid level meter (23); the inner wall of the furnace (6) is provided with fire-resistant concrete (24), and the outer side of the boiler main body (1) is provided with an aluminum silicate fiber board (25).

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