Gas inlet pipeline system of gas heat storage trolley type heating furnace

Abstract

The utility model relates to a fuel gas inlet pipeline system of a fuel gas heat storage trolley type heating furnace, which comprises a furnace body, and a plurality of heat storage burners are arranged on the furnace body. The regenerative burner is provided with an inner mixed burner and a plurality of outer mixed burners; the internal mixing burner is connected to a fuel pipe through an internal mixing fuel pipe via an internal mixing control valve group; the plurality of external mixing burners are connected to a fuel pipe through an external mixing control valve group after being gathered through an external mixing fuel pipe; each of the internal mixing control valve group and the external mixing control valve group is provided with more than two paths of valve groups which are connected in parallel; and each valve group is formed by connecting an electromagnetic on-off valve and a manual regulating valve in series. According to the fuel gas inlet pipeline system of the fuel gas heat storage trolley type heating furnace, efficient fuel opening and closing and flow adjustment are achieved through the arrangement of the fuel adjusting valve set, the temperature change response is faster, the temperature change process curve can be better met, and therefore the heating time is shortened, and the purposes of energy saving and environment protection are indirectly achieved.

Description

Technical Field

[0001] This utility model relates to the design of the gas inlet pipeline for a gas-fired regenerative trolley-type heater, belonging to the field of industrial heater technology. Background Technology

[0002] In the field of industrial heating, gas-fired bogie hearth furnaces are still the main type of furnaces used, especially in steel forging and heat treatment. This is because gas-fired bogie hearth furnaces have a fast temperature rise and adjustment response, high energy density, and temperatures that can reach over 1000℃. Moreover, gas-fired bogie hearth furnaces that use natural gas or other fuels produce clean air emissions, mainly CO2 (carbon dioxide, a product of the reaction between fuel and oxygen), NOx (nitrogen oxides, a product of nitrogen in the air at high temperatures), and H2O (water).

[0003] Gas-fired bogie-type heaters currently mainly use regenerative burners, which contain internal heat storage media. The burner's operating state needs to be frequently switched to store heat in the heat storage media, which in turn requires the gas supply pipeline system to be frequently switched on and off. If the gas supply pipeline cannot be switched on and off in a timely manner, it will lead to the burner injecting too little or too much fuel, resulting in incomplete combustion and the generation of pollutants.

[0004] Therefore, it is necessary to design the gas inlet pipeline system for the gas regenerative trolley heater. Utility Model Content

[0005] The purpose of this utility model is to provide a gas inlet pipeline system for a gas-fired thermal storage trolley-type heater. By setting up a fuel regulating valve group, efficient fuel opening and closing and flow regulation can be achieved, resulting in faster temperature change response and better meeting the temperature change process curve, thereby shortening the heating time and indirectly achieving the purpose of energy saving and environmental protection.

[0006] To achieve the above-mentioned utility model objectives, this utility model provides a gas inlet pipeline system for a gas-fired regenerative trolley-type heating furnace, including a furnace body with a plurality of regenerative burners on the furnace body;

[0007] The regenerative burner has an internal mixing burner and several external mixing burners;

[0008] The internal mixing burner is connected to the fuel line via the internal mixing fuel line and the internal mixing control valve assembly;

[0009] Several external mixing burners are connected to the fuel pipe via an external mixing fuel pipe and then to the fuel pipe through an external mixing control valve group.

[0010] Both the internal mixing control valve group and the external mixing control valve group are equipped with two or more valve groups connected in parallel.

[0011] Each valve group consists of a solenoid valve and a manual regulating valve connected in series.

[0012] As a further improvement of this utility model, a three-way valve group is connected in parallel within the internal mixing control valve group;

[0013] The first internal mixing electromagnetic on / off valve and the first internal mixing manual regulating valve are connected in series to form the first internal mixing fuel passage.

[0014] The second internal mixing electromagnetic on / off valve and the second internal mixing manual regulating valve are connected in series to form the second internal mixing fuel channel.

[0015] The third internal mixing electromagnetic on / off valve and the third internal mixing manual regulating valve are connected in series to form the third internal mixing fuel passage.

[0016] Furthermore, the fuel flow rate in the first internal mixing fuel channel is S1;

[0017] The fuel flow rate in the second internal mixing fuel channel is S2;

[0018] The fuel flow rate in the third internal mixing fuel channel is S3;

[0019] S1>S2>S3.

[0020] Furthermore, fuel enters the internal mixing burner of the regenerable burner via the internal mixing fuel branch pipe, internal mixing control valve group, and internal mixing fuel pipe. By controlling the opening and closing of each internal mixing solenoid valve in the internal mixing control valve group, three fuel flow rates, S1, S2, and S3, can be obtained.

[0021] Furthermore, by controlling the opening and closing of each internal mixing solenoid valve in the internal mixing control valve group, four additional fuel flow rates can be obtained: S1+S2, S1+S3, S2+S3, and S1+S2+S4.

[0022] Furthermore, the external mixing control valve group has three valve groups connected in parallel;

[0023] The first external mixing electromagnetic on / off valve and the first external mixing manual regulating valve are connected in series to form the first external mixing fuel channel;

[0024] The second external mixing electromagnetic on / off valve and the second external mixing manual regulating valve are connected in series to form the second external mixing fuel channel;

[0025] The third external mixing electromagnetic on / off valve and the third external mixing manual regulating valve are connected in series to form the third external mixing fuel channel;

[0026] The flow rate of fuel in the first external mixing fuel channel is matched with the flow rate of fuel in the first internal mixing fuel channel.

[0027] The flow rate of fuel in the second external mixing fuel channel is matched with the flow rate of fuel in the second internal mixing fuel channel.

[0028] The fuel flow rate in the third external mixing fuel channel is matched with the fuel flow rate in the third internal mixing fuel channel.

[0029] As a further improvement of this utility model, a number of environmentally friendly small burners are distributed on the furnace body; the environmentally friendly small burners are arranged at intervals with the main burner.

[0030] A group of four regenerative burners consists of two adjacent regenerative burners on the same side of the furnace wall and two adjacent regenerative burners on the opposite side of the furnace wall.

[0031] Several environmentally friendly small burners are grouped together to form a small burner group, and the small burner group is located in the area of ​​a heat storage burner group;

[0032] The environmentally friendly small burners in a group of small burners share a set of control valves and are connected to the fuel pipe via an auxiliary fuel branch pipe.

[0033] Furthermore, each environmentally friendly small burner in a group of small burners is connected to a small fuel pipe via a pipe;

[0034] The small fuel tube is positioned in the middle of several environmentally friendly small burners in a group of small burners;

[0035] A three-way parallel valve group consisting of a small electromagnetic on / off valve and a small manual regulating valve is installed between the small fuel line and the auxiliary fuel branch line.

[0036] The first small electromagnetic on / off valve and the first small manual regulating valve are connected in series to form the first small fuel passage;

[0037] The second small electromagnetic valve and the second small manual regulating valve are connected in series to form the second small fuel passage;

[0038] The third small electromagnetic valve and the third small manual regulating valve are connected in series to form the third small fuel passage.

[0039] As a further improvement of this utility model, a main valve, a filter, and a high-pressure flow meter are connected in series on the fuel main pipe;

[0040] The fuel main pipe is divided into an ignition gas pipe and a combustion gas pipe;

[0041] The combustion gas pipe is equipped with a main pressure reducing valve, a main pressure gauge, a main venting valve, a main gas high-pressure switch, a main gas low-pressure switch, and an emergency shut-off valve in sequence, and finally laid to the heat storage burner through the combustion gas pipe.

[0042] The ignition gas pipe is equipped with a secondary pressure reducing valve, a secondary pressure gauge, a secondary venting valve, a secondary high-pressure gas switch, a secondary low-pressure gas switch, and a solenoid valve in sequence, and is laid to the igniter via the ignition gas pipe.

[0043] The gas inlet pipeline system of this utility model for a gas-fired regenerative trolley-type heater ensures that each burner (internal mixing burner, external mixing burner, and environmentally friendly small burner) is equipped with a fuel on / off and flow rate / flow regulation valve group consisting of a series of electromagnetic on / off valves and a manual regulating valve connected in parallel. This enables rapid on / off of the burners and rapid adjustment of the fuel injection quantity, satisfying the need for rapid switching of the working mode of the regenerative burners within a group of regenerative burners, as well as rapid temperature switching within the furnace. At the same time, the environmentally friendly small burner can also respond quickly to achieve the reduction combustion of nitrogen oxides generated during the combustion of the regenerative burners, thus achieving low nitrogen oxide emissions.

[0044] The gas inlet pipeline system of this utility model's gas storage trolley-type heater achieves efficient fuel opening and closing and flow regulation by setting a fuel regulating valve group, which makes the temperature change response faster and can better meet the temperature change process curve, thereby shortening the heating time and indirectly achieving the purpose of energy saving and environmental protection. Attached Figure Description

[0045] Figure 1 This is a schematic diagram of the overall structure of the gas-fired thermal regenerative bogie-type heater of this utility model (taking the bogie furnace as an example);

[0046] Figure 2 for Figure 1 Enlarged schematic diagram of the heating furnace section in the diagram;

[0047] Figure 3 This is a side view of the internal structure of the gas-fired thermal regenerative trolley-type heater of this utility model;

[0048] Figure 4 This is a bottom view of the internal structure of the gas-fired thermal regenerative trolley-type heater of this utility model;

[0049] Figure 5 This is a schematic diagram of the gas inlet pipeline system of the gas-fired thermal storage trolley-type heater of this utility model;

[0050] Figure 6 This is a schematic diagram of the gas supply structure of a regenerative burner, which is one of the structural forms of this utility model.

[0051] Figure 7 This is a schematic diagram of the gas supply structure of the regenerative burner of the present invention, which is structural form two.

[0052] Figure 8 This is a schematic diagram of the gas supply structure of the environmentally friendly small burner of this utility model;

[0053] Figure 9 for Figure 8 A schematic diagram of the gas supply structure for a set of environmentally friendly small burners;

[0054] Figure 10 A schematic diagram of the valve structure for gas source intake. Detailed Implementation

[0055] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings.

[0056] The present invention relates to a gas-fired thermal storage bogie-type heater, taking the bogie furnace as an example.

[0057] The overall structure of the gas-fired thermal regenerative bogie-type heater involved in this utility model is as follows: Figure 1 As shown, a trolley 1 is provided, and a trolley drive 12 is provided below the trolley 1 to drive the trolley 1 to enter and exit the heating furnace 2; the heating furnace 2 is provided with a furnace body 21 that is basically rectangular, and an opening is provided on one side of the furnace body 21 to facilitate the entry and exit of the trolley 1, and a furnace door 22 is provided at the opening.

[0058] Further integration Figure 2 , Figure 3 , Figure 4 For the rectangular furnace body 21 and the bogie furnace structure, several regenerative burners 3 are generally provided on both sides of the furnace body 21. The regenerative burners 3 are preferably low-NOx regenerative burners, which generally have a heat storage body made of honeycomb ceramic and can perform heat exchange. The regenerative burners 3 are preferably evenly distributed and arranged in pairs opposite each other.

[0059] In this utility model, the preferred embodiment is as follows: Figure 2 , Figure 4 As shown, two adjacent regenerative burners 3 on the same side of the furnace wall and two adjacent regenerative burners 3 on the opposite side of the furnace wall, totaling four regenerative burners 3, form a regenerative burner group 30. Figure 4 As shown, the four regenerative burners 3 in a set of regenerative burners 30 can be numbered A, B, C, and D respectively. When the heating furnace 2 is working, the two diagonally opposite regenerative burners 3 (A and D, B and C) are in the same working state, that is, the combustion state or the flue gas exhaust state; as shown Figure 4 As shown, regenerative burners A and D 3 are in combustion mode, injecting fuel and air for ignition and combustion. Meanwhile, adjacent regenerative burners B and C 3 on the same side of the furnace wall are in exhaust mode, expelling the flue gas generated inside the furnace 21. During exhaust, the flue gas flows through the regenerator, heating it and storing some of the high-temperature heat energy contained in the flue gas. When the operating state switches, i.e., regenerative burners B and C are in combustion mode while regenerative burners A and D are in exhaust mode, when external air enters the furnace 21 through regenerative burners B and C, the air first passes through the regenerator. At this time, the regenerator is at a high temperature, preheating the air before it is blown into the furnace 21, thereby reducing the heat absorption effect of the external cold air and achieving energy saving.

[0060] A pressure sensor 24 is installed on the furnace body 21 to monitor the pressure inside the furnace body 21. When the pressure is too high, an alarm will be triggered to troubleshoot the problem.

[0061] A pressure relief pipe 26 is provided on the furnace wall of the furnace body 21 near the main exhaust pipe 8. A pressure relief valve 27 is installed on the pressure relief pipe 26, and the pressure relief pipe 26 is directly connected to the main exhaust pipe 8. When the pressure inside the furnace body 21 is high, the pressure relief valve 27 will be opened automatically, and the pressure will be discharged into the main exhaust pipe 8 through the pressure relief pipe 26, so as to ensure that the pressure inside the furnace body 21 is always within the desired range, generally a slight positive pressure, such as 5-30 Pa.

[0062] To improve the nitrogen oxide content in the flue gas, this invention also includes several environmentally friendly small burners 4 distributed on the wall of the furnace body 21. These environmentally friendly small burners 4 need to be positioned at a sufficiently large distance from the regenerable burner 3; practical experience shows that the interval distance needs to be greater than 1.5 meters. This invention directly uses the environmentally friendly small burners 4 to participate in the combustion and heating within the furnace body 21.

[0063] When the regenerative burner 3 is in combustion mode, it injects air heated by the regenerative body while injecting fuel. The air mainly contains oxygen (O2, 21%) and nitrogen (N2, 78%). The oxygen and fuel are fully combined for combustion. At high temperature, the nitrogen combines with the excess oxygen to produce nitrogen oxides (mainly nitric oxide / NO, and a small amount of nitrogen dioxide / NO2, and trace amounts of nitrous oxide / N2O and other unstable nitrogen oxides).

[0064] While the regenerable burner 3 heats the furnace body 21, the content of nitrogen oxides / NOx increases with the rise in temperature. Especially when the temperature is above 1000℃, nitrogen in the air reacts directly with oxygen, and the nitrogen oxides / NOx will increase sharply. Moreover, as the regenerable body efficiently heats the incoming air, the air is more likely to be heated to above 1000℃, which further aggravates the generation of nitrogen oxides / NOx.

[0065] The purpose of setting up the environmentally friendly small burner 4 is to react nitrogen oxides with carbon monoxide / CO. Fuel is introduced into the environmentally friendly small burner 4 for combustion. Because it is far from the regenerable burner 3 (which injects air during combustion), it is in a low-oxygen environment. The fuel injected from the environmentally friendly small burner 4 undergoes incomplete combustion within the furnace body 21, producing a large amount of carbon monoxide / CO. This carbon monoxide / CO combines and reacts with nitrogen oxides in the surrounding air to produce more stable carbon dioxide / CO2 and nitrogen / N2, thus reducing the nitrogen oxide content.

[0066] 2CO + 2NO = 2CO2 + N2, temperature > 780℃;

[0067] 4CO + 2NO2 = 4CO2 + N2, temperature > 780℃.

[0068] Further preferably, several environmentally friendly small burners 4 are grouped together to form a small burner group 40. The small burner group 40 is located in the area of ​​a group of heat storage burners 30 and provides auxiliary heating to the area heated by the heat storage burner group 30. Moreover, within a group of heat storage burners 30, multiple environmentally friendly small burners 4 are set in the area away from the heat storage burner 3, so that the temperature is more uniform throughout the furnace body 21.

[0069] In this embodiment, since the furnace body 21 is rectangular, heat storage burners 3 are arranged on both sides of the furnace body 21. Therefore, the appropriate position is far away from the heat storage burners 3. Considering the technical requirements for assisting in increasing the temperature inside the furnace, the environmentally friendly small burner 4 is preferably arranged at the top of the furnace body 21, and the combustion flame generated by the environmentally friendly small burner 4 is preferably sprayed downward.

[0070] Both the regenerative burner 3 and the environmentally friendly small burner 4 are connected to the fuel pipe 5, which is generally filled with natural gas. The main component of the natural gas is methane (CH4) (>85%), with the remainder being alkanes, including ethane (C2H6), propane (C3H8), and butane (C4H6). 10 And non-alkane gases, including hydrogen sulfide (H2S).

[0071] Each regenerator burner 3 is equipped with a reversing valve 6 above it. The reversing valve 6 is connected to the air main pipe 7 and the flue gas main pipe 8 through the air branch pipe 72 and the flue gas exhaust branch pipe 82, respectively. The end of the flue gas exhaust main pipe 8 is connected to the flue gas purification device 9. The flue gas is treated by the flue gas purification device 9 before being discharged, achieving ultra-low emissions (NOx content in the flue gas is less than 50mg / m³).

[0072] The reversing valve 6 is a selective three-way valve. The lower part of the reversing valve 6 is connected to the inner cavity of the regenerator burner 3 via a connecting pipe 64, with the preferred passage being through the regenerator. The main body of the reversing valve 6 is a switching valve, with its lower part connected to the connecting pipe 64, while its upper part is connected to the air branch pipe 72 and the exhaust branch pipe 82 respectively. The switching valve ensures that only the air branch pipe 72 or the exhaust branch pipe 82 is connected to the connecting pipe 64; that is, when the switching valve connects the air branch pipe 72 to the connecting pipe 64, the path of the exhaust branch pipe 82 is blocked. When the valve is closed, the regenerator burner 3 connected to the reversing valve 6 is in combustion mode, and external air enters the regenerator burner 3 through the air branch pipe 72-reversing valve 6-connecting pipe 64. Similarly, when the valve is switched so that the exhaust branch pipe 82 is connected to the connecting pipe 64, the path of the air branch pipe 72 is closed. At this time, the regenerator burner 3 connected to the reversing valve 6 is in exhaust mode, and the flue gas in the furnace body 21 is discharged into the exhaust main pipe 8 through the regenerator burner 3 through the connecting pipe 64-reversing valve 6-exhaust branch pipe 82.

[0073] Two regenerable burners 3 are grouped together and connected to their reversing valves 6. Each of the two upper ports of the reversing valve 6 is equipped with a manual adjusting valve 63, which allows adjustment of the port opening. The ports on the same side of the two reversing valves 6 are connected to the same connecting pipe, i.e., the air side is simultaneously connected to the air inlet pipe 61, and the exhaust side is simultaneously connected to the exhaust outlet pipe 62. The air inlet pipes 61 of each group of regenerable burners 3 are connected to the main air pipe 71 via an air branch pipe 72, and the main air pipe 71 is then connected to the main air pipe 7. Similarly, the exhaust outlet pipes 62 of each group of regenerable burners 3 are connected to the main exhaust pipe 81 via an exhaust branch pipe 82, and the main exhaust pipe 81 is then connected to the main exhaust pipe 8. This connection structure ensures that the air inlet pipe 61 to the main air pipe 7, and the exhaust pipe 62 to the main exhaust pipe 8, are parallel paths. This prevents rapid connections along a single main pipe from causing varying pressures at different points due to their distance from the main pipe, resulting in significant differences in air intake and exhaust volumes and affecting temperature uniformity within the furnace body 21. By installing a manual regulating valve 63 at the interface of each reversing valve 6, the opening degree can be further adjusted, resulting in more uniform airflow velocity or exhaust gas velocity entering each regenerator burner 3, thus ensuring temperature uniformity within the furnace body 21.

[0074] Although the flue gas in the furnace body 21 stores some heat energy in the regenerator as it flows through the regenerator burner 3, the temperature of the flue gas will still be relatively high. Therefore, it is necessary to monitor the temperature of the connecting pipe 64, the reversing valve 6, and the exhaust branch pipe 82 to prevent damage to the pipes and valves due to high temperatures. When the temperature of the relevant pipes and valves rises to a high temperature (e.g., 500℃) due to the flow of flue gas, it is necessary to switch the state of the reversing valve 6 to change the working state of the regenerator burner group 30. External cold air can be used to cool the reversing valve 6 and the connecting pipe 64, and also to allow the exhaust branch pipe 82 to cool down naturally. Alternatively, the temperature of the regenerator in the regenerator burner 3 can be monitored, and when the exhaust... When the temperature of the regenerator in the regenerator 3 on the combustion side rises to 1000℃, or the temperature of the regenerator in the regenerator 3 on the combustion side drops to 200℃, the state of the switching valve 6 can be triggered to change the working state of the regenerator group 30 in order to improve the heat exchange efficiency of the regenerator. Generally speaking, the temperature of the above-mentioned facilities and equipment can be detected, and then the switching cycle of the four switching valves 6 in a group of regenerators 30 can be set, which is generally 30~90 seconds, to switch the working state of the four regenerators 3 in a group of regenerators 30, thereby improving the heat exchange efficiency of the regenerator and ensuring the safe working temperature of the relevant components.

[0075] Because the regenerative burner 3 needs to frequently switch operating states, the fuel pipe 5 connected to it also needs to be opened and closed efficiently through a control valve. Furthermore, the temperature inside the furnace body 21 of the heating furnace 2 is generally set with different temperature profiles depending on the heating application, such as forging heating or heat treatment requirements; that is, different temperatures need to be reached, such as 1000℃, 1200℃, and 1400℃. Correspondingly, the regenerative burner 3 needs to inject different amounts (flow rates, velocity) of fuel, i.e., natural gas, according to the temperature, to generate different amounts of heat energy through combustion.

[0076] To meet the fuel injection quantity regulation requirements of the regenerative burner 3, and considering the control valve requirements, a gas proportional valve is often considered. While gas proportional valves can flexibly adjust gas flow, they are also limited by their structural design, resulting in slow opening and closing responses. Closing often takes several seconds, and adjusting to the required gas flow rate also typically takes several seconds, which cannot adequately meet the requirements of the gas inlet pipeline system of this gas regenerative bogie furnace. If future gas proportional valve technology becomes more advanced, achieving a response time of less than one second, it can be applied to gas regenerative bogie furnaces.

[0077] Currently, in order to meet the fuel flow regulation requirements of the regenerative burner 3, as well as the requirements for frequent and rapid start-up and shutdown switching, this utility model adopts the following... Figure 5 , Figure 6 , Figure 7 The gas supply structure shown includes a regenerative burner 3. Considering the need for low NOx production and energy saving during combustion, such as the regenerative low NOx heat treatment burner in Chinese Patent Publication No. CN108087877A, it typically has an internal mixing burner in the center, surrounded by several external mixing burners. The internal mixing burner has one internal mixing fuel inlet 31, while the external mixing burners, depending on the structure, have two external mixing fuel inlets 36 (e.g., ...). Figure 6 (as shown), or an external fuel inlet 36 (as shown) Figure 7 (as shown), but whether it is one or two external mixing fuel inlets 36, they will eventually be connected to the external mixing control valve assembly through the external mixing fuel pipe 37.

[0078] The internal mixing fuel inlet 31 of the regenerative burner 3 is connected to the internal mixing control valve group through the internal mixing fuel pipe 32, and then connected to the fuel pipe 5 through the internal mixing fuel branch pipe 51. As shown in the figure, there are several valve groups connected in parallel in the internal mixing control valve group. Each valve group includes an internal mixing solenoid valve 33 and an internal mixing manual regulating valve 34. The internal mixing solenoid valve 33 is responsible for opening and closing, and the internal mixing manual regulating valve 34 is responsible for regulating the flow rate of the gas passing through.

[0079] The first internal mixing electromagnetic on / off valve 331 and the first internal mixing manual regulating valve 341 are connected in series to form the first internal mixing fuel passage.

[0080] The second internal mixing electromagnetic on / off valve 332 and the second internal mixing manual regulating valve 342 are connected in series to form the second internal mixing fuel channel.

[0081] The third internal mixing electromagnetic on / off valve 333 and the third internal mixing manual regulating valve 343 are connected in series to form the third internal mixing fuel passage.

[0082] Based on the fuel flow rate in the fuel channel and the adjustment range of the internal mixing manual regulating valve 34, the corresponding size of the internal mixing electromagnetic on / off valve 33 is adapted; ultimately, the fuel flow rate S1 in the first internal mixing fuel channel > the fuel flow rate S2 in the second internal mixing fuel channel > the fuel flow rate S3 in the third internal mixing fuel channel.

[0083] Thus, fuel enters the regenerative burner 3 via the internal mixing fuel branch pipe 51, the internal mixing control valve group, the internal mixing fuel pipe 32, and the internal mixing fuel inlet 31. By controlling the opening and closing of the corresponding internal mixing electromagnetic valve 33, at least three fuel flow rates, S1, S2, and S3, can be obtained. With proper design, it is even possible to obtain four additional fuel flow rates, S1+S2, S1+S3, S2+S3, and S1+S2+S4, for a total of seven fuel flow rates. This results in the regenerative burner 3 generating seven combustion heat values, which are then rapidly switched within the furnace body 21 to generate seven temperature values.

[0084] Correspondingly, in order to match the fuel injection volume of the internal mixing burner, the external mixing burner is connected to the external mixing control valve group through the external mixing fuel inlet 36 and the external mixing fuel pipe 37; the external mixing control valve group is also composed of three parallel external mixing electromagnetic on / off valves 38 and external mixing manual adjustment valves 39, and is finally connected to the fuel pipe 5 through the external mixing fuel branch pipe 52.

[0085] The first external mixing electromagnetic on / off valve 381 and the first external mixing manual regulating valve 391 are connected in series to form the first external mixing fuel channel; the fuel flow rate in the first external mixing fuel channel is adapted to the fuel flow rate S1 in the first internal mixing fuel channel.

[0086] The second external mixing electromagnetic on / off valve 382 and the second external mixing manual regulating valve 392 are connected in series to form the second external mixing fuel channel; the fuel flow rate in the second external mixing fuel channel is adapted to the fuel flow rate S2 in the second internal mixing fuel channel.

[0087] The third external mixing electromagnetic on / off valve 383 and the third external mixing manual regulating valve 393 are connected in series to form the third external mixing fuel channel; the fuel flow rate in the third external mixing fuel channel is adapted to the fuel flow rate S3 in the third internal mixing fuel channel.

[0088] Further preferred, to achieve low NOx emissions during combustion, such as Figure 8 , Figure 9As shown, the environmentally friendly small burner 4 is preferably connected to the fuel pipe 5 via a three-way parallel valve group and an auxiliary fuel branch pipe 54.

[0089] A set of environmentally friendly small burners 4 within a group of small burners 40 share a set of control valves, thereby reducing the number of valve groups;

[0090] Each environmentally friendly small burner 4 is connected to a small fuel pipe 42 via a metal flexible tube and a control valve 41. The small fuel pipe 42 is preferably located in the middle of several environmentally friendly small burners 4 in a group of small burners 40, so that the distance to each environmentally friendly small burner 4 is relatively equal. Each environmentally friendly small burner 4 is equipped with a manual control valve 41 to further control the opening and closing of the environmentally friendly small burner 4.

[0091] Between the small fuel pipe 42 and the auxiliary fuel branch pipe 54, there is a valve group consisting of three parallel connections, namely a small electromagnetic on / off valve 43 and a small manual regulating valve 44.

[0092] The first small electromagnetic on / off valve 431 and the first small manual regulating valve 441 are connected in series to form the first small fuel passage.

[0093] The second small electromagnetic on / off valve 432 and the second small manual regulating valve 442 are connected in series to form the second small fuel passage.

[0094] The third small electromagnetic on / off valve 433 and the third small manual regulating valve 443 are connected in series to form the third small fuel passage.

[0095] Each burner (internal mixing burner and external mixing burner of regenerative burner 3, and environmentally friendly small burner 4) is equipped with a fuel opening / closing and flow rate / flow regulation valve group on the channel connected to the fuel pipe 5. This group consists of a series electromagnetic opening / closing valve and a manual regulating valve connected in parallel in three separate circuits. This enables rapid opening and closing of the burners and rapid adjustment of the fuel injection quantity. This satisfies the need for rapid switching of the working mode of the regenerative burner 3 in a group of regenerative burners 30, as well as rapid temperature switching in the furnace body 21. At the same time, the environmentally friendly small burner 4 can also respond quickly to reduce and burn the nitrogen oxides generated during the combustion of the regenerative burner 3, thereby achieving low nitrogen oxide emissions.

[0096] The burner will also be equipped with an igniter / ignition gun, which is connected to the fuel line 5 via an ignition gas pipe, such as... Figure 10As shown, the gas pipe connected to the burner nozzle and the gas pipe connected to the burner igniter are separate. A main valve 551, a filter 552, and a high-pressure flow meter 553 are connected in series on the main pipe 550. This separation reduces the impact of the fuel flow rate in the ignition gas pipe 570 on the fuel flow rate in the combustion gas pipe 560, thereby stabilizing the fuel flow rate / flow of the aforementioned flow rate / flow regulating valve group. The combustion gas pipe 560 is sequentially equipped with a main pressure reducing valve 561, a main pressure gauge 562, a main venting valve 563, a main gas high-pressure switch 564, a main gas low-pressure switch 565, and an emergency shut-off valve 566. Finally, the combustion gas pipe 560 is laid to the regenerative burner 3 and the environmentally friendly small burner 4, and then connected to the corresponding pipelines through parallel valve groups. The ignition gas pipe 570 is also equipped with a secondary pressure reducing valve 571, a secondary pressure gauge 572, a secondary venting valve 573, a secondary gas high-pressure switch 574, a secondary gas low-pressure switch 575, and a solenoid valve 576 in sequence. It is laid through the ignition gas pipe 570 to the heat storage burner 3 and the environmental protection small burner 4, and is connected to the internal igniter respectively. Preferably, the ignition gas pipe 570 is also equipped with a manual ball valve 577, which is connected to the main pipe 550 through the gas branch pipe 578. The fuel flow rate in the ignition gas pipe 570 can be manually adjusted by the manual ball valve 577, and the opening and closing of the fuel in the ignition gas pipe 570 can be remotely controlled by the solenoid valve 576, thereby remotely controlling the opening and closing of the igniter.

[0097] The environmentally friendly small burner 4 is connected to the fuel pipe. However, because it is necessary to adjust the fuel flow rate according to the generation of nitrogen oxides, and generate an appropriate amount of carbon monoxide to reduce nitrogen oxides, the size of the combustion flame at the environmentally friendly small burner 4 will change significantly with the fuel flow rate. In addition, the regenerable burner 3 in the exhaust state will generate negative pressure on the inside to exhaust the surrounding flue gas. If the fuel pressure at the environmentally friendly small burner 4 is low, it will be affected by this and flow rapidly towards the regenerable burner 3 in the exhaust state, so that the fuel cannot be fully burned and is discharged as flue gas.

[0098] As a further improvement of this utility model, the environmentally friendly small burner 4 is provided with an air inlet, and the air inlet is equipped with a blower. The air outlet of the blower is the air inlet of the environmentally friendly small burner 4, and the air inlet of the blower is connected to the nearby exhaust branch pipe 82 or exhaust main pipe 8. In this embodiment, the end of the air inlet is perpendicular to the top of the furnace body 21 and points downwards. When the blower is working, it inputs the flue gas in the exhaust branch pipe 82 or exhaust main pipe 8 into the environmentally friendly small burner 4 and blows it downwards. Since there is almost no oxygen in the flue gas, the fuel sprayed from the environmentally friendly small burner 4 is still burning in a low-oxygen environment. The fuel mixes with the returning flue gas, and the sprayed flue gas carries the fuel. The vertical downward direction increases the combustion range, expanding the area from which carbon monoxide is produced in a low-oxygen environment, thus allowing for the treatment of nitrogen oxides within the furnace body 21 over a wider area. Simultaneously, the downward flow of flue gas blowing the flames generated by fuel combustion further heats the central area of ​​the furnace body 21, improving thermal energy utilization. The increased flame area also improves the uniformity of temperature within the furnace. In particular, the blower's flue gas recirculation allows the fuel and flames ejected from the four environmentally friendly small burners to remain within the furnace body 21 for a longer period, reducing the negative pressure effect of the exhaust gas from the three regenerable burners in their exhaust state.

[0099] The gas inlet pipeline system of this utility model's gas storage trolley-type heater achieves efficient fuel opening and closing and flow regulation by setting a fuel regulating valve group, which makes the temperature change response faster and can better meet the temperature change process curve, thereby shortening the heating time and indirectly achieving the purpose of energy saving and environmental protection.

[0100] The preferred embodiments of this utility model have been described in detail above, but this utility model is not limited to the embodiments described. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of this utility model, and these equivalent modifications or substitutions are all included within the scope defined by the claims of this application.

Claims

1. A gas inlet pipeline system for a gas-fired regenerative trolley-type heater, including a furnace body on which several regenerative burners are installed; The regenerative burner has an internal mixing burner and several external mixing burners; Its features are, The internal mixing burner is connected to the fuel line via the internal mixing fuel line and the internal mixing control valve assembly; Several external mixing burners are connected to the fuel pipe via an external mixing fuel pipe and then to the fuel pipe through an external mixing control valve group. Both the internal mixing control valve group and the external mixing control valve group are equipped with two or more valve groups connected in parallel. Each valve group consists of a solenoid valve and a manual regulating valve connected in series.

2. The gas inlet pipeline system for the gas-fired regenerative trolley-type heater as described in claim 1, characterized in that, The internal mixing control valve group has three valve groups connected in parallel. The first internal mixing electromagnetic on / off valve and the first internal mixing manual regulating valve are connected in series to form the first internal mixing fuel passage. The second internal mixing electromagnetic on / off valve and the second internal mixing manual regulating valve are connected in series to form the second internal mixing fuel channel. The third internal mixing electromagnetic on / off valve and the third internal mixing manual regulating valve are connected in series to form the third internal mixing fuel passage.

3. The gas inlet pipeline system for the gas-fired regenerative trolley-type heater as described in claim 2, characterized in that, The fuel flow rate in the first internal mixing fuel channel is S1; The fuel flow rate in the second internal mixing fuel channel is S2; The fuel flow rate in the third internal mixing fuel channel is S3; S1>S2>S3.

4. The gas inlet pipeline system for the gas-fired regenerative trolley-type heater as described in claim 3, characterized in that, Fuel enters the internal mixing burner of the regenerable burner via the internal mixing fuel branch pipe, internal mixing control valve group, and internal mixing fuel pipe. By controlling the opening and closing of each internal mixing solenoid valve in the internal mixing control valve group, three fuel flow rates, S1, S2, and S3, can be obtained.

5. The gas inlet pipeline system for the gas-fired regenerative trolley-type heater as described in claim 4, characterized in that, By controlling the opening and closing of each internal mixing solenoid valve in the internal mixing control valve group, four fuel flow rates can be obtained: S1+S2, S1+S3, S2+S3, and S1+S2+S4.

6. The gas inlet pipeline system for the gas-fired regenerative trolley-type heater as described in claim 2 or 3, characterized in that, The external mixing control valve group has three valve groups connected in parallel. The first external mixing electromagnetic on / off valve and the first external mixing manual regulating valve are connected in series to form the first external mixing fuel channel; The second external mixing electromagnetic on / off valve and the second external mixing manual regulating valve are connected in series to form the second external mixing fuel channel; The third external mixing electromagnetic on / off valve and the third external mixing manual regulating valve are connected in series to form the third external mixing fuel channel; The flow rate of fuel in the first external mixing fuel channel is matched with the flow rate of fuel in the first internal mixing fuel channel. The flow rate of fuel in the second external mixing fuel channel is matched with the flow rate of fuel in the second internal mixing fuel channel. The fuel flow rate in the third external mixing fuel channel is matched with the fuel flow rate in the third internal mixing fuel channel.

7. The gas inlet pipeline system for the gas-fired regenerative trolley-type heater as described in claim 1 or 2, characterized in that, Several environmentally friendly small burners are distributed on the furnace body; the environmentally friendly small burners are arranged alternately with the main burner; A group of four regenerative burners consists of two adjacent regenerative burners on the same side of the furnace wall and two adjacent regenerative burners on the opposite side of the furnace wall. Several environmentally friendly small burners are grouped together to form a small burner group, and the small burner group is located in the area of ​​a heat storage burner group; The environmentally friendly small burners in a group of small burners share a set of control valves and are connected to the fuel pipe via an auxiliary fuel branch pipe.

8. The gas inlet pipeline system for the gas-fired regenerative trolley-type heater as described in claim 7, characterized in that, Each environmentally friendly small burner in a group of small burners is connected to a small fuel pipe via a pipe. The small fuel tube is positioned in the middle of several environmentally friendly small burners in a group of small burners; A three-way parallel valve group consisting of a small electromagnetic on / off valve and a small manual regulating valve is installed between the small fuel line and the auxiliary fuel branch line. The first small electromagnetic on / off valve and the first small manual regulating valve are connected in series to form the first small fuel passage; The second small electromagnetic valve and the second small manual regulating valve are connected in series to form the second small fuel passage; The third small electromagnetic valve and the third small manual regulating valve are connected in series to form the third small fuel passage.

9. The gas inlet pipeline system for the gas-fired regenerative trolley-type heater as described in claim 1, characterized in that, The fuel main pipe is equipped with a main valve, a filter, and a high-pressure flow meter connected in series. The fuel main pipe is divided into an ignition gas pipe and a combustion gas pipe; The combustion gas pipe is equipped with a main pressure reducing valve, a main pressure gauge, a main venting valve, a main gas high-pressure switch, a main gas low-pressure switch, and an emergency shut-off valve in sequence, and finally laid to the heat storage burner through the combustion gas pipe. The ignition gas pipe is equipped with a secondary pressure reducing valve, a secondary pressure gauge, a secondary venting valve, a secondary high-pressure gas switch, a secondary low-pressure gas switch, and a solenoid valve in sequence, and is laid to the igniter via the ignition gas pipe.

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