A horizontal water tube gas steam boiler

Abstract

The present invention discloses a horizontal water tube gas steam boiler, comprising a boiler body, a burner, an economizer, a lower drum, a heat exchange tube assembly and an upper drum. A furnace is provided inside the boiler body, the burner is used to spray flames into the furnace, the furnace is provided with a smoke outlet, and the smoke outlet is connected to the economizer; the two ends of the heat exchange tube assembly are respectively connected to the upper drum and the lower drum, the heat exchange tube assembly is arranged in the furnace, the heat exchange tube assembly divides the internal space of the furnace into a curved rotating flue, and the rotating flue is connected to the smoke outlet. The present invention directly arranges the heat exchange tube assembly inside the furnace, and the heat exchange tube assembly divides the internal space of the furnace into a curved rotating flue, the high-temperature flame and high-temperature flue gas generated by the burner can directly act on the heat exchange tube assembly, and the water inside the heat exchange tube assembly is heated by radiation heat transfer and convection heat transfer, so that the heat exchange tube assembly quickly generates steam.

Description

Technical Field

[0001] The invention belongs to the technical field of boilers, and in particular relates to a horizontal water tube gas steam boiler. Background Art

[0002] A boiler is an energy conversion device. The energy input to the boiler includes chemical energy and electrical energy in the fuel. The boiler outputs steam, high-temperature water or organic heat carrier with a certain amount of thermal energy. The original meaning of a pot refers to a water container heated on fire, and a furnace refers to a place where fuel is burned. A boiler consists of two parts: a pot and a furnace. The hot water or steam generated in the boiler can directly provide the required thermal energy for industrial production and people's lives. After the water enters the boiler, the boiler heating surface in the steam-water system transfers the absorbed heat to the water, heating the water into hot water of a certain temperature and pressure or generating steam, which is then drawn out for use. At the same time, the fuel combustion continuously releases heat, and the high-temperature flue gas generated by the combustion transfers heat to the boiler heating surface through heat propagation, while its own temperature gradually decreases and is finally discharged from the chimney.

[0003] Chinese patent document CN220119352U discloses a WNS micro-superheated steam boiler and a heating system thereof, wherein the WNS micro-superheated steam boiler comprises a turning flue and a superheater, wherein the superheater comprises a box, a steam inlet header, a steam outlet header and a heat exchange coil group, wherein the steam inlet header is connected to the steam outlet header through the heat exchange coil group, and each heat exchange coil group is arranged in sequence from top to bottom to form a smoke passage. The WNS micro-superheated steam boiler places the superheater outside the boiler body through the combination of the turning flue and the superheater, and the arrangement of the heating surface of the superheater is no longer restricted by the internal space of the front smoke box, and the heat exchange area can be flexibly increased and decreased according to demand, and the heat exchange coil group of the superheater is arranged in sequence from top to bottom to form a smoke passage, which solves the problem of smoke scouring dead corners, and cooperates with the structural setting of the steam inlet header and the steam outlet header to improve the heat exchange efficiency of the heat exchange coil group and ensure the superheated steam temperature, so that the superheated steam temperature generated by it reaches the design value requirement.

[0004] The WNS slightly superheated steam boiler of the above patent document uses a curved flue to transport high-temperature flue gas to the superheater, and the high-temperature flue gas then exchanges heat with the heat exchange coil group inside the superheater to obtain steam. This technical solution has the problems of slow water temperature rise and long steam start-up time. Summary of the invention

[0005] The object of the present invention is to provide a horizontal water tube gas steam boiler for solving the above-mentioned problems existing in the prior art.

[0006] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a horizontal water-tube gas steam boiler, comprising a boiler body, a burner, an economizer, a lower drum, a heat exchange tube assembly and an upper drum, a furnace is provided inside the boiler body, the burner is used to spray flame into the furnace, the furnace is provided with a smoke outlet, and the smoke outlet is connected to the economizer; the two ends of the heat exchange tube assembly are respectively connected to the upper drum and the lower drum, the heat exchange tube assembly is arranged in the furnace, and the heat exchange tube assembly divides the internal space of the furnace into a curved rotary flue, and the rotary flue is connected to the smoke outlet.

[0007] As an optional implementation of the above technical solution, the rotating flue includes a first flue, a second flue and a third flue which are connected in sequence, a first corner area is provided between the first flue and the second flue, a second corner area is provided between the second flue and the third flue, and the third flue is connected to the smoke outlet.

[0008] As an optional implementation of the above technical solution, 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 the first heat exchange tube group, the second heat exchange tube group and the third heat exchange tube group are all connected to the upper boiler drum, the other ends of the first heat exchange tube group, the second heat exchange tube group and the third heat exchange tube group are all connected to the lower boiler drum, the first flue is arranged between the first heat exchange tube group and the second heat exchange tube group, the second flue is arranged between the second heat exchange tube group and the third heat exchange tube group, and the third flue is arranged between the third heat exchange tube group and the inner wall of the furnace.

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

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

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

[0012] As an optional implementation of the above technical solution, second fins are provided on both sides of the second tube bundle, and the second fins on both sides of the second tube bundle extend into the first flue and the second flue respectively.

[0013] As an optional implementation of the above technical solution, the third heat exchange tube group includes a plurality of third tube bundles arranged side by side, both ends of the third tube bundle are respectively connected to the upper boiler drum and the lower boiler drum, and a third fin is provided between the two third tube bundles outside the second corner area.

[0014] As an optional implementation of the above technical solution, third fins are provided on both sides of the third tube bundle, and the third fins on both sides of the third tube bundle extend into the second flue and the third flue respectively.

[0015] As an optional implementation of the above technical solution, the water outlet end of the economizer is connected to the lower boiler drum.

[0016] As an optional implementation of the above technical solution, the economizer is connected to a condensing heat exchanger.

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

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

[0019] The beneficial effects of the present invention are:

[0020] The present invention provides a horizontal water tube gas steam boiler, which directly sets the heat exchange tube assembly inside the furnace, and the heat exchange tube assembly divides the internal space of the furnace into a curved rotating flue, and the high-temperature flame and high-temperature flue gas generated by the burner can directly act on the heat exchange tube assembly, and the water inside the heat exchange tube assembly is heated by 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 of the present invention has the advantages of fast water temperature rise speed, short steam start-up time, small water volume, energy saving and less heat loss. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a front structural schematic diagram of a horizontal water tube gas steam boiler in one embodiment of the present invention;

[0022] Figure 2 It is a schematic diagram of the internal structure of a horizontal water tube gas steam boiler in one embodiment of the present invention;

[0023] Figure 3 It is a schematic structural diagram of a heat exchange tube assembly in one embodiment of the present invention.

[0024] In the figure: 1- boiler body; 2- burner; 3- economizer; 4- lower drum; 5- upper drum; 6- furnace; 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 fiberboard. DETAILED DESCRIPTION

[0025] like Figure 1-Figure 3 As shown, this embodiment provides a horizontal water tube gas steam boiler, including a boiler body 1, a burner 2, an economizer 3, a lower drum 4, a heat exchange tube assembly and an upper drum 5. A furnace 6 is provided inside the boiler body 1, and a refractory concrete 24 is provided on the inner wall of the furnace 6. An aluminum silicate fiberboard 25 is provided on the outer side of the boiler body 1. The burner 2 is arranged on one side of the furnace 6, and the burner 2 is used to spray flames into the furnace 6. The burner 2 can use natural gas or fuel oil. After the fuel is mixed with air, it is ignited in the furnace 6 through the ignition of the burner 2 to generate high-temperature combustion gas (i.e., flue gas). In this process, the chemical energy of the fuel is converted into the thermal energy of the high-temperature flue gas. The furnace 6 is provided with a flue gas outlet 7, and the flue gas outlet 7 is connected to the economizer 3, so that the thermal energy of the flue gas can be fully utilized. In order to further recycle the thermal energy of the flue gas, the economizer 3 is connected to a condensing heat exchanger 21.

[0026] like Figure 2 As shown, the two ends of the heat exchange tube assembly are respectively connected to the upper drum 5 and the lower drum 4, and the upper drum 5 is equipped with a liquid level electrode tube 22 and a liquid level meter 23, so as to know the liquid level state of the upper drum 5 in real time. The heat exchange tube assembly is arranged in the furnace 6, and the heat exchange tube assembly divides the internal space of the furnace 6 into a curved revolving flue 8, and the revolving flue 8 is connected to the flue gas outlet 7. The water outlet end of the economizer 3 is connected to the lower drum 4 to provide hot water for the lower drum 4.

[0027] The present invention directly sets the heat exchange tube assembly inside the furnace 6, and the heat exchange tube assembly divides the internal space of the furnace 6 into a curved rotating 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, and the water inside the heat exchange tube assembly is heated by 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 of the present invention has the advantages of fast water temperature rise, short steam start-up time, small water volume, energy saving and less heat loss.

[0028] like Figure 3As shown, specifically, the rotary flue 8 includes a first flue 9, a second flue 10 and a third flue 11 which are connected in sequence, a first corner area is provided between the first flue 9 and the second flue 10, a second corner area is provided between the second flue 10 and the third flue 11, and 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 sprays high-temperature flames 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 is finally discharged from the flue gas outlet 7.

[0029] Among them, 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 the first heat exchange tube group, the second heat exchange tube group and the third heat exchange tube group are connected to the upper boiler drum 5, the other ends of the first heat exchange tube group, the second heat exchange tube group and the third heat exchange tube group are connected to the lower boiler drum 4, the first flue 9 is arranged between the first heat exchange tube group and the second heat exchange tube group, the second flue 10 is arranged between the second heat exchange tube group and the third heat exchange tube group, and the third flue 11 is arranged 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 group includes a plurality of first tube bundles 12 arranged side by side. The first tube bundles 12 are made of metal tubes. The two ends of the first tube bundles 12 are respectively connected to the upper drum 5 and the lower drum 4. A first fin 13 is connected between two adjacent first tube bundles 12. The first fin 13 is used to close the gap between two adjacent first tube bundles 12 to prevent the loss of high-temperature flue gas, and can transfer heat to the first tube bundle 12 by heat conduction. In order to further improve the heat transfer effect, the first tube bundle 12 is provided with a first fin 14, and the first fin 14 extends into the first flue 9.

[0031] The second heat exchange tube group includes a plurality of second tube bundles 15 arranged side by side. The second tube bundles 15 are made of metal tubes. The two ends of the second tube bundles 15 are respectively connected to the upper drum 5 and the lower drum 4. A second fin 16 is provided between the two second tube bundles 15 outside the first corner area. The second fin 16 and the first fin 13 have the same function of blocking high-temperature flue gas and absorbing the heat of high-temperature flue gas. Among them, no second fin 16 is provided between the second tube bundles 15 located in the first corner area, so that the high-temperature flue gas can smoothly enter the second flue 10 from the first flue 9. In order to further improve the heat transfer effect, second fins 17 are provided on both sides of the second tube bundle 15, and the second fins 17 on both sides of the second tube bundle 15 extend into the first flue 9 and the second flue 10 respectively.

[0032] The third heat exchange tube group includes a plurality of third tube bundles 18 arranged side by side. The third tube bundles 18 are made of metal tubes. The two ends of the third tube bundles 18 are respectively connected to the upper drum 5 and the lower drum 4. A third fin 19 is provided between the two third tube bundles 18 outside the second corner area. The third fin 19 has the same function of blocking high-temperature flue gas and absorbing the heat of high-temperature flue gas as the first fin 13. Among them, the third fin 19 is not provided between the third tube 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, third fins 20 are provided on both sides of the third tube bundle 18, and the third fins 20 on both sides of the third tube bundle 18 extend into the second flue 10 and the third flue 11 respectively.

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

[0034] Fuel combustion: Horizontal water tube gas steam boiler can use natural gas or oil as fuel. After the fuel is mixed with air, it is ignited in the furnace 6 through the ignition of the burner 2 to produce high-temperature combustion gas (i.e. flue gas). In this process, the chemical energy of the fuel is converted into the thermal energy of the high-temperature flue gas.

[0035] Heat transfer methods: (1) Radiative heat transfer: The high-temperature flame directly acts on the first tube bundle 12 and the second tube bundle 15, causing the water temperature of the first tube bundle 12 and the second tube bundle 15 to rise rapidly. (2) Convective heat transfer: The high-temperature flue gas flows in the furnace 6 and transfers heat to the first tube bundle 12, the second tube bundle 15 and the third tube 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 transfer the heat to the water in the tube through the metal tube.

[0036] In order to allow the high-temperature flue gas to be discharged from the boiler smoothly, the second fin 16 is not provided between the second tube bundle 15 located in the first corner area, and the third fin 19 is not provided between the third tube bundle 18 located in the second corner area to form a 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 methods, so that the water temperature of the metal pipe rises rapidly. The flue gas still has a high temperature after the heat transfer. In order to improve the utilization efficiency of energy, the temperature of the flue gas is reduced by adding an economizer 3 to increase the water temperature entering the lower drum 4. The condensing heat exchanger 21 can be installed as needed. 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 increased. Through this process, the flue gas temperature can almost reach below 60°C. In order to prevent flue gas leakage and excessive scouring when the boiler is running, refractory concrete 24 will be poured in the boiler system when the boiler is manufactured; in addition, in order to reduce the radiation heat dissipation of the boiler system to the air, multiple layers of thermal insulation material aluminum silicate fiberboard 25 are wrapped on the outside of the boiler body 1.

[0037] Heating and vaporization of water: The boiler water system starts to operate with the ignition of the boiler. The water in the water tank first enters the economizer 3 through the action of the water pump, and then enters the lower drum 4. The lower drum 4 is connected to the metal tube. As the heat is continuously transferred to the metal tube, the water temperature inside the metal tube gradually rises to the boiling point. The water will change from liquid phase to gas phase inside the metal tube. Since the liquid phase and gas phase system of the boiler are usually under high pressure, the boiling point of water will be higher than 100°C under standard atmospheric pressure. When the water is heated to the boiling point, it begins to boil and converts into steam. Steam accumulates in the upper drum 5, and the pressure gradually increases to form steam with a certain pressure. When the boiler is running, the operation of the condensing heat exchanger 21 can increase the temperature of the water in the water tank. The display of the entire boiler water level is observed through the liquid level meter 23. When the water level of the boiler system is displayed incorrectly, if a dangerous water level appears, the liquid level float in the liquid level electrode tube 22 will drop, and the signal will be transmitted to the control system of the boiler, which will emit an audible and visual alarm, and then the boiler will be shut down to ensure the safety of the boiler.

[0038] Transportation and use of steam: The upper drum 5 has a steam outlet, and the steam is transported through a pipeline to the equipment that needs to be heated or driven, and is used 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 process in the chemical, textile, papermaking and other 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 first fin 14, the second fin 17 and the third fin 20 are used to increase the heating area of ​​the entire system, thereby improving the thermal efficiency. The boiler does not have a rotary smoke chamber, but uses the first flue 9, the second flue 10 and the third flue 11 to form a rotary flue 8, and the smoke flows out of the entire boiler system along the rotary flue 8.

[0042] 3. The first fin 14, the second fin 17 and the third fin 20 increase the disturbance of the flue gas and the resistance of the flue gas, and 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 to fully utilize the heat of high-temperature flue gas.

[0044] In the description of the present invention, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, and may be fixedly connected, detachably connected, or integrated; may be mechanically connected or electrically connected; may be directly connected or indirectly connected through an intermediate medium, may be the internal connection of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood. In addition, the specific features, structures, etc. described in the embodiments are included in at least one embodiment. Under the condition that there is no contradiction, those skilled in the art may combine the features of different embodiments. The protection scope of the present invention is not limited to the above-mentioned specific embodiments. According to the basic technical concept of the present invention, the embodiments that can be associated with by ordinary technicians in this field without creative work all belong to the protection scope of the present invention.

Claims

1. A horizontal water tube gas steam boiler, characterized in that: The invention comprises a boiler body (1), a burner (2), an economizer (3), a lower drum (4), a heat exchange tube assembly and an upper drum (5); a furnace (6) is arranged inside the boiler body (1); the burner (2) is used to spray flame into the furnace (6); the furnace (6) is provided with a smoke outlet (7); and the smoke outlet (7) is connected to the economizer (3); two ends of the heat exchange tube assembly are respectively connected to the upper drum (5) and the lower drum (4); the heat exchange tube assembly is arranged in the furnace (6); the heat exchange tube assembly divides the internal space of the furnace (6) into curved revolving flues (8); and the revolving flues (8) are connected to the smoke outlet (7).

2. The horizontal water tube gas steam boiler according to claim 1, characterized in that: The rotary flue (8) comprises a first flue (9), a second flue (10) and a third flue (11) which are connected in sequence, a first corner area is provided between the first flue (9) and the second flue (10), a second corner area is provided between the second flue (10) and the third flue (11), and the third flue (11) is connected to the flue gas outlet (7).

3. The horizontal water tube gas steam boiler according to claim 2, characterized in that: The heat exchange tube assembly comprises a first heat exchange tube group, a second heat exchange tube group and a third heat exchange tube group, one end of the first heat exchange tube group, the second heat exchange tube group and the third heat exchange tube group are all connected to the upper drum (5), the other ends of the first heat exchange tube group, the second heat exchange tube group and the third heat exchange tube group are all connected to the lower drum (4), the first flue (9) is arranged between the first heat exchange tube group and the second heat exchange tube group, the second flue (10) is arranged between the second heat exchange tube group and the third heat exchange tube group, and the third flue (11) is arranged between the third heat exchange tube group and the inner wall of the furnace (6).

4. The horizontal water tube gas steam boiler according to claim 3, characterized in that: The first heat exchange tube group comprises a plurality of first tube bundles (12) arranged side by side, the two ends of the first tube bundle (12) are respectively connected to the upper drum (5) and the lower drum (4), and a first fin (13) is connected between two adjacent first tube bundles (12).

5. The horizontal water tube gas steam boiler according to claim 4, characterized in that: The first tube bundle (12) is provided with a first fin (14), and the first fin (14) extends into the first flue (9).

6. The horizontal water tube gas steam boiler according to claim 3, characterized in that: The second heat exchange tube group comprises a plurality of second tube bundles (15) arranged side by side, the two ends of the second tube bundle (15) being respectively connected to the upper drum (5) and the lower drum (4), and a second fin (16) being provided between the two second tube bundles (15) outside the first corner area.

7. The horizontal water tube gas steam boiler according to claim 6, characterized in that: Second fins (17) are provided on both sides of the second tube bundle (15), and the second fins (17) on both sides of the second tube bundle (15) extend into the first flue (9) and the second flue (10) respectively.

8. The horizontal water tube gas steam boiler according to claim 3, characterized in that: The third heat exchange tube group comprises a plurality of third tube bundles (18) arranged side by side, the two ends of the third tube bundle (18) being respectively connected to the upper drum (5) and the lower drum (4), and a third fin (19) being arranged between two third tube bundles (18) outside the second corner area.

9. The horizontal water tube gas steam boiler according to claim 8, characterized in that: Third fins (20) are provided on both sides of the third tube bundle (18), and the third fins (20) on both sides of the third tube bundle (18) extend into the second flue (10) and the third flue (11) respectively.

10. The horizontal water tube gas steam boiler according to claim 1, characterized in that: The water outlet end of the economizer (3) is connected to the lower drum (4); the economizer (3) is connected to a condensing heat exchanger (21); the upper drum (5) is provided with a liquid level electrode tube (22) and a liquid level gauge (23); the inner wall of the furnace (6) is provided with refractory concrete (24), and the outer side of the boiler body (1) is provided with an aluminum silicate fiberboard (25).

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