Novel heat accumulating type heating furnace reversing system

Abstract

The utility model discloses a novel heat accumulating type heating furnace reversing system which comprises a three-way reversing valve, one end of the three-way reversing valve is connected with a coal gas channel, the other end of the three-way reversing valve is connected with a smoke channel, the third end of the three-way reversing valve is connected with a main channel, side valves are arranged at the joint of the coal gas channel and the three-way reversing valve and the joint of the smoke channel and the three-way reversing valve, and the smoke channel and the coal gas channel are vertically arranged. A gas butterfly valve is arranged at the upper part of the gas channel; the three-way reversing valve is used for switching connection between the main channel and the smoke channel or the coal gas channel. If the cylinder is opened and closed, leaked gas cannot enter the three-way reversing valve to be mixed with coal gas or flue gas, and the possibility that the coal gas escapes from a coal gas hole is avoided; only the flue gas side opening and closing cylinder is stopped, the coal gas side opening and closing cylinder is kept in a pressing and closing state, then the coal gas butterfly valve additionally arranged on the upstream is closed, and two seals can ensure the disassembly and assembly safety during maintenance; the thermal resistance thermodetector is high in reliability and can display temperature values.

Description

Technical Field

[0001] The utility model relates to the technical field of the reversing system of a heating furnace, in particular to a novel reversing system of a regenerative heating furnace. Background Art

[0002] Regenerative heating furnaces are generally divided into sectional centralized reversing and full-furnace decentralized reversing. For the former, a pair of reversing valves is used for each control section, and for the latter, a pair of reversing valves is used for each burner. There are those using double quick-switching to form the reversing valves and those using double-closed three-way reversing valves. This invention mainly aims at the method for improving the safety of a regenerative heating furnace with full-furnace decentralized reversing using double-closed three-way reversing valves, and it also has certain reference significance for regenerative heating furnaces using other types of reversing valves and control methods.

[0003] The three-way reversing valve is arranged vertically in a double row, with a total of three channels and pneumatic drive. For the upper two channels, one is the inlet for air (or gas), and the other channel is the flue gas outlet. The lower channel is connected to the regenerator chamber ( Figure 1 ). The valve flap and the valve seat are sealed with fluororubber sealing rings. The two valve flaps are driven to act by two cylinders respectively and are controlled by two solenoid valves respectively ( Figure 2 ). The actions of the valve flaps are detected by two position detection switches respectively. The switches are magnetic switches and are directly installed on the cylinders. When the valve is working normally, one valve flap is open and the other is closed. After the reversing instruction is issued, the open valve flap first closes. After it is in place, the detection switch below it sends a signal to give an instruction to the originally closed valve flap, making it act and open. After it is in place, a signal indicating being in place is given, and thus the reversing action is completed. A bimetallic thermometer is provided at the lower part of the valve body to detect the temperature of the valve at any time. Once the over-temperature situation occurs, the two electromagnets lose power simultaneously, and both valve flaps are in the closed state, which can effectively protect the whole valve. However, the prior art has the following problems:

[0004] ① After the opening and closing components fail, they cannot be effectively deactivated. Only relying on the fluororubber seal of the valve core, if the valve is blocked or the seal is ablated, gas will enter the flue gas pipeline, posing a major safety hazard.

[0005] ② After the piston seal or the cylinder rod seal of the opening and closing cylinder is damaged, compressed air will leak into the valve, posing a major safety hazard. When the opening and closing cylinder is deactivated, gas will enter the opening and closing cylinder from the failed cylinder rod seal, and there is a risk of gas poisoning from the gas hole.

[0006] ③ The opening and closing components use one compressed air pipe to control the opening and closing cylinders of gas and flue gas. If the air source is closed, the opening and closing cylinders of the valve cores of both three-way reversing valves will lose pressure, resulting in poor sealing on the gas side. There is a major safety risk when dealing with the valve core on the flue gas side.

[0007] ④The bimetallic thermometer for measuring the temperature of the reversing valve has a plastic shell and can only display two states: "normal" and "overtemperature". When the reversing valve is overheated, it often causes the pointer and the shell to deform and is extremely easy to damage. After the thermometer fails, the over-temperature interlock protection program fails, resulting in serious burning of the three-way reversing valve and also posing a major safety hazard.

[0008] To solve the above problems, a new type of regenerative heating furnace reversing system is proposed. Summary of the Invention

[0009] The purpose of the present utility model is to solve the above problems and provide a new type of regenerative heating furnace reversing system.

[0010] The specific scheme of the present utility model is: a new type of regenerative heating furnace reversing system, including: a three-way reversing valve, one end of the three-way reversing valve is connected to a gas channel, the other end is connected to a flue gas channel, and the third end is connected to a main channel. Side valves are provided at the connections of the gas channel and the flue gas channel with the three-way reversing valve. The flue gas channel and the gas channel are vertically arranged. A flue gas butterfly valve is provided at the upper part of the flue gas channel, and a gas butterfly valve is provided at the upper part of the gas channel; the three-way reversing valve is used to switch the connection between the main channel and the flue gas channel or the gas channel.

[0011] Further, the three-way reversing valve includes: a three-way joint, a flue gas chamber and a gas chamber are provided inside the three-way joint, and the flue gas chamber and the gas chamber are separated by a partition; the outside of the flue gas chamber is communicated with the flue gas channel; the outside of the gas chamber is communicated with the gas channel; a flue gas hole is provided at the lower end of the flue gas chamber, a gas hole is provided at the lower end of the gas chamber, and both the flue gas hole and the gas hole are communicated with the main channel; corresponding opening and closing components are provided on the flue gas hole and the gas hole, the opening and closing components are arranged on the three-way joint, and the opening and closing components are used to open or close the corresponding flue gas hole or gas hole.

[0012] Further, the opening and closing component includes: an opening and closing cylinder, a driving shaft is connected to the cylinder shaft of the opening and closing cylinder, a valve core is connected to the lower end of the driving shaft, and the valve core is a circular sealing plate-like structure for sealing the corresponding flue gas hole or gas hole.

[0013] Further, the cylinder shaft of the opening and closing cylinder is arranged outside the three-way joint.

[0014] Further, a ferrule ball valve is provided at the upper end of the opening and closing cylinder, the ferrule ball valve.

[0015] Further, a thermal resistance thermometer is provided on the three-way joint.

[0016] The present utility model has the following beneficial effects:

[0017] 1. If the three-way directional valve fails, the valve on that side can be closed to stop smoke exhaust or air intake, and the burner can be deactivated.

[0018] 2. If the opening and closing cylinder leaks, air will not enter the three-way directional valve and mix with gas or flue gas, nor is there a possibility of gas escaping from the gas hole.

[0019] 3. Only the opening and closing cylinder on the flue gas side can be stopped, and the opening and closing cylinder on the gas side remains in a tightly closed state. Then, close the additional gas butterfly valve upstream of it. The two seals can ensure the safety of disassembly and assembly during maintenance.

[0020] 4. The thermal resistance thermometer has high reliability and can display the temperature value. The operator can take more targeted operations based on the temperature of the three-way valve, effectively protecting the three-way directional valve. Brief Description of the Drawings

[0021] Figure 1 is a schematic structural diagram of the present utility model;

[0022] Figure 2 is a schematic structural diagram of the first embodiment of the three-way directional valve;

[0023] Figure 3 is a schematic structural diagram of the second embodiment of the three-way directional valve;

[0024] In the figure: 1. Three-way directional valve; 101. Three-way joint; 102. Gas chamber; 103. Flue gas chamber; 104. Partition; 105. Gas hole; 106. Flue gas hole; 107. Opening and closing cylinder; 108. Driving shaft; 109. Valve core; 110. Compression fitting ball valve; 2. Gas channel; 3. Flue gas channel; 4. Side valve; 5. Gas butterfly valve; 6. Flue gas butterfly valve; 7. Main channel; 8. Thermal resistance thermometer. Detailed Embodiment

[0025] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0026] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) in the embodiments of the present utility model, the directional indications are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the drawings). If the specific posture changes, the directional indications will also change accordingly.

[0027] In addition, if the descriptions such as "first" and "second" are involved in the embodiments of the present utility model, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and / or" appearing throughout the text includes three parallel scenarios. Taking "A and / or B" as an example, it includes scenario A, scenario B, or the scenario where both A and B are satisfied simultaneously. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement it. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0028] Please refer to Figures 1 - 3 ,

[0029] Embodiment 1, a novel regenerative heating furnace commutation system, comprising: a three-way commutation valve 1, one end of the three-way commutation valve 1 is connected to a gas channel 2, the other end is connected to a flue gas channel 3, and the third end is connected to a main channel 7. Side valves 4 are provided at the connections of the gas channel 2 and the flue gas channel 3 with the three-way commutation valve 1. The flue gas channel 3 and the gas channel 2 are vertically arranged. A flue gas butterfly valve 6 is provided at the upper part of the flue gas channel 3, and a gas butterfly valve 5 is provided at the upper part of the gas channel 2; the three-way commutation valve 1 is used to switch the connection between the main channel 7 and the flue gas channel 3 or the gas channel 2.

[0030] In this embodiment, the three-way commutation valve 1 comprises: a three-way joint 101, a flue gas chamber 103 and a gas chamber 102 are provided inside the three-way joint 101, and the flue gas chamber 103 and the gas chamber 102 are separated by a partition 104; the outside of the flue gas chamber 103 is communicated with the flue gas channel 3; the outside of the gas chamber 102 is communicated with the gas channel 2; a flue gas hole 106 is provided at the lower end of the flue gas chamber 103, a gas hole 105 is provided at the lower end of the gas chamber 102, and both the flue gas hole 106 and the gas hole 105 are communicated with the main channel 7; opening and closing components are provided on both the flue gas hole 106 and the gas hole 105, and the opening and closing components are arranged on the three-way joint 101, and the opening and closing components are used to open or close the corresponding flue gas hole 106 or gas hole 105.

[0031] In this embodiment, the opening and closing component comprises: an opening and closing cylinder 107, a driving shaft 108 is connected to the cylinder shaft of the opening and closing cylinder 107, a valve core 109 is connected to the lower end of the driving shaft 108, and the valve core 109 is of a circular sealing plate-like structure and is used to seal the corresponding flue gas hole 106 or gas hole 105.

[0032] In this embodiment, a ferrule type ball valve 110 is provided at the upper end of the opening and closing air cylinder 107, and the ferrule type ball valve 110.

[0033] In this embodiment, a thermal resistance thermometer 8 is provided on the three-way joint 101.

[0034] Embodiment 2

[0035] The difference from Embodiment 1 is that in this embodiment, the cylinder shaft of the opening and closing air cylinder 107 is arranged outside the three-way joint 101.

Claims

1. A novel regenerative heating furnace reversing system, comprising: A three-way reversing valve, one end of which is connected to the gas channel, the other end is connected to the smoke channel, and the third end is connected to the main channel. A side valve is provided at the connection between the gas channel and the smoke channel and the three-way reversing valve. It is characterized in that: the smoke channel and the gas channel are vertically arranged, a smoke butterfly valve is provided on the upper part of the smoke channel, and a gas butterfly valve is provided on the upper part of the gas channel; the three-way reversing valve is used to switch the connection between the main channel and the smoke channel or the gas channel.

2. According to claim 1, a novel regenerative heating furnace reversing system is characterized in that: The three-way reversing valve comprises: a three-way joint, a smoke chamber and a coal gas chamber are arranged in the three-way joint, the smoke chamber and the coal gas chamber are separated by a partition; the outer side of the smoke chamber is connected with the smoke channel; the outer side of the coal gas chamber is connected with the coal gas channel; a smoke hole is arranged at the lower end of the smoke chamber, a coal gas hole is arranged at the lower end of the coal gas chamber, and the smoke hole and the coal gas hole are both connected with the main channel; the smoke hole and the coal gas hole are both provided with corresponding opening and closing components, the opening and closing components are arranged on the three-way joint, and the opening and closing components are used to open or close the corresponding smoke hole or coal gas hole.

3. According to claim 2, a novel regenerative heating furnace reversing system is characterized in that: The opening and closing component includes: an opening and closing cylinder, a cylinder shaft of which is connected to a driving shaft, a lower end of which is connected to a valve core, and the valve core is a circular sealing plate structure for sealing the corresponding smoke holes or gas holes.

4. According to claim 3, a novel regenerative heating furnace reversing system is characterized in that: The cylinder shaft of the opening and closing cylinder is arranged outside the three-way joint.

5. According to claim 3, a novel regenerative heating furnace reversing system is characterized in that: A sleeve-type ball valve is arranged at the upper end of the opening and closing cylinder.

6. The novel regenerative heating furnace reversing system according to claim 2 is characterized in that: A thermal resistance temperature measuring instrument is arranged on the three-way joint.

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