Blast furnace gas-fired high-temperature binary molten salt furnace

Abstract

The utility model discloses a high-temperature binary molten salt furnace burning blast furnace gas. The high-temperature binary molten salt furnace comprises a furnace body, an inner ring coil pipe, an outer ring coil pipe and a burner, wherein the lower end part of the furnace body is provided with a smoke outlet, the inner coil pipe and the outer coil pipe are both mounted in the furnace body, the inner coil pipe is positioned on the inner side of the outer coil pipe, the inner side of the inner coil pipe is provided with a radiation heat exchange chamber, a convection heat exchange channel is arranged between the inner coil pipe and the outer coil pipe, and the inner coil pipe and the outer coil pipe are arranged in the radiation heat exchange chamber. The upper end of the radiation heat exchange chamber is communicated with the upper end of the convection heat exchange channel, the lower end of the convection heat exchange channel is communicated with the smoke outlet, and the width B of the convection heat exchange channel is larger than or equal to 0.5 m. An installation opening communicated with the radiation heat exchange chamber is formed in the bottom of the furnace body. And the combustor is connected to the mounting opening and is used for combusting in the radiation heat exchange chamber to generate flue gas. The smoke exhaust speed can be increased, smoke can be exhausted smoothly, and the smoke is prevented from being accumulated in the furnace body.

Description

Technical Field

[0001] The utility model relates to a high-temperature binary molten salt furnace fueled by blast furnace gas. Background Art

[0002] At present, molten salt furnace is a commonly used equipment in industry. Some existing molten salt furnaces use blast furnace gas as fuel. Blast furnace gas contains a lot of dust, so a lot of smoke will be generated during combustion. In addition, blast furnace gas contains few combustible components and has a very low calorific value. Therefore, in order to obtain enough heat and reach a sufficiently high heating temperature, more blast furnace gas needs to be burned. Therefore, the amount of smoke generated in molten salt furnaces using blast furnace gas as fuel is particularly large. The existing molten salt furnace has narrow passages, which causes a large amount of smoke to gather in the molten salt furnace and cannot be quickly discharged, resulting in poor smoke exhaust, which in turn affects the normal operation of the molten salt furnace.

[0003] For example, a Chinese patent with publication number CN209623097U discloses a new type of ultra-low nitrogen gas-fired molten salt boiler, which has a boiler shell, an outer coil in the convection zone, and an inner coil in the radiation zone. The outer coil in the convection zone divides the originally small space between the inner coil in the radiation zone and the boiler shell to form an outer flue and a middle flue, resulting in the outer flue and the middle flue being relatively narrow and long. A large amount of flue gas in the combustion chamber needs to pass through the middle flue and the outer flue in sequence before it can be discharged from the exhaust port. Since the outer flue and the middle flue are relatively narrow and long, the flow rate of the flue gas is small and the flow is blocked when the flue gas flows through, resulting in the inability of the flue gas to be quickly discharged from the exhaust port, resulting in poor exhaust of the flue gas. Utility Model Content

[0004] The technical problem to be solved by the utility model is to overcome the defects of the prior art and provide a high-temperature binary molten salt furnace fueled by blast furnace gas, which can increase the speed of smoke exhaust, enable the smoke to be discharged smoothly, and avoid smoke accumulation in the furnace body.

[0005] In order to solve the above technical problems, the technical solution of the utility model is: a high-temperature binary molten salt furnace burning blast furnace gas, which includes a furnace body, an inner coil, an outer coil and a burner;

[0006] The lower end of the furnace body is provided with a smoke exhaust port;

[0007] The inner coil and the outer coil are both installed in the furnace body, and the inner coil is located on the inner side of the outer coil;

[0008] A radiation heat exchange chamber is provided inside the inner coil, a convection heat exchange channel is provided between the inner coil and the outer coil, the upper end of the radiation heat exchange chamber is communicated with the upper end of the convection heat exchange channel, the lower end of the convection heat exchange channel is communicated with the smoke exhaust port, and the width B of the convection heat exchange channel is ≥0.5m;

[0009] The bottom of the furnace body is provided with a mounting opening communicating with the radiation heat exchange chamber;

[0010] The burner is connected to the installation port and is used for burning in the radiation heat exchange chamber to generate flue gas.

[0011] Furthermore, the outer coil is arranged close to the inner wall of the furnace body.

[0012] Furthermore, the inner diameter D of the inner coil is ≥3m.

[0013] Furthermore, the lower end of the inner coil is connected to the bottom of the furnace body.

[0014] Furthermore, the blast furnace gas-fired high-temperature binary molten salt furnace also includes a top coil and a thermal insulation sealing top cover, wherein the top coil is connected to the upper end of the outer ring coil and extends inwardly, and the thermal insulation sealing top cover is connected to the top coil.

[0015] Furthermore, the blast furnace gas-fired high-temperature binary molten salt furnace further comprises an upper header and a lower header;

[0016] The lower header is communicated with the lower end of the inner coil and the lower end of the outer coil respectively;

[0017] The upper end of the outer coil is connected to one end of the top coil;

[0018] The other end of the top coil and the upper end of the inner ring coil are respectively communicated with the upper header.

[0019] Furthermore, the outer coil and the top coil are formed by winding a plurality of furnace tubes in parallel and forming an integral body;

[0020] The inner coil is also formed by winding a plurality of furnace tubes in parallel;

[0021] The lower end of the furnace tube extends out of the furnace body and is connected to the lower header, and the upper end of the furnace tube extends out of the furnace body and is connected to the upper header.

[0022] Furthermore, a temperature sensor is connected to the portion of the upper end of each furnace tube extending out of the furnace body.

[0023] Furthermore, the thermal insulation sealing top cover is made of high temperature resistant ceramic fiber.

[0024] In order to facilitate maintenance, the top and bottom of the furnace body are respectively provided with maintenance manholes, and the furnace body is also connected to a ladder.

[0025] After adopting the above technical solution, the fuel used by the burner is blast furnace gas, and the burner burns in the radiation heat exchange chamber to generate a large amount of flue gas, which flows upward and flows from the upper end of the radiation heat exchange chamber into the upper end of the convection heat exchange channel, and then flows downward through the convection heat exchange channel and is discharged from the exhaust port. Among them, only one convection heat exchange channel is provided between the inner coil and the furnace body for the flue gas to flow through, so the width B of the convection heat exchange channel can be set larger. In this embodiment, the width B of the convection heat exchange channel is ≥0.5m, so the flow resistance of the flue gas is small and the flow rate is large when the flue gas flows through the convection heat exchange channel, so that the flue gas can quickly pass through the convection heat exchange channel and be discharged from the exhaust port, making the flue gas discharge smoother, so that the large amount of flue gas generated when the burner burns blast furnace gas can be discharged quickly and efficiently, avoiding the accumulation of flue gas in the furnace body. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic structural diagram of a high-temperature binary molten salt furnace fueled by blast furnace gas according to the utility model;

[0027] Figure 2 It is a top view of the high-temperature binary molten salt furnace burning blast furnace gas of the utility model;

[0028] Figure 3 It is a top sectional view of a high-temperature binary molten salt furnace burning blast furnace gas according to the utility model. DETAILED DESCRIPTION

[0029] In order to make the content of the utility model more clearly understood, the utility model is further described in detail below based on specific embodiments and in conjunction with the accompanying drawings.

[0030] like Figures 1 to 3 As shown, a high-temperature binary molten salt furnace fueled by blast furnace gas comprises a furnace body 1, an inner coil 2, an outer coil 3 and a burner 4;

[0031] The lower end of the furnace body 1 is provided with a smoke exhaust port 5;

[0032] The inner coil 2 and the outer coil 3 are both installed in the furnace body 1, and the inner coil 2 is located on the inner side of the outer coil 3;

[0033] A radiation heat exchange chamber 6 is provided inside the inner coil 2, a convection heat exchange channel 7 is provided between the inner coil 2 and the outer coil 3, the upper end of the radiation heat exchange chamber 6 is communicated with the upper end of the convection heat exchange channel 7, the lower end of the convection heat exchange channel 7 is communicated with the smoke exhaust port 5, and the width B of the convection heat exchange channel 7 is ≥ 0.5 m;

[0034] The bottom of the furnace body 1 is provided with a mounting opening 8 communicating with the radiation heat exchange chamber 6;

[0035] The burner 4 is connected to the mounting port 8 and is used to burn in the radiation heat exchange chamber 6 to generate flue gas. In this embodiment, the fuel used by the burner 4 is blast furnace gas. The burner 4 burns in the radiation heat exchange chamber 6 to generate a large amount of flue gas. The flue gas flows upward and flows from the upper end of the radiation heat exchange chamber 6 into the upper end of the convection heat exchange channel 7, and then flows downward through the convection heat exchange channel 7 and is discharged from the exhaust port 5. Among them, only the convection heat exchange channel 7 is provided between the inner coil 2 and the furnace body 1 for the flue gas to flow through, so the width B of the convection heat exchange channel 7 can be set larger. In this embodiment, the width B of the convection heat exchange channel 7 is ≥ 0.5m, so the flow resistance of the flue gas is small and the flow rate is large when the flue gas flows through the convection heat exchange channel 7, so that the flue gas can quickly pass through the convection heat exchange channel 7 and be discharged from the exhaust port 5, so that the flue gas discharge is smoother, so that the large amount of flue gas generated when the burner 4 burns blast furnace gas can be discharged quickly and efficiently, and the flue gas is prevented from accumulating in the furnace body 1. Specifically, the smoke is discharged from the smoke exhaust port 5 and then enters the waste heat recovery system.

[0036] like Figure 1 As shown, the outer ring coil 3 is arranged close to the inner wall of the furnace body 1 , so that the width B of the convection heat exchange channel 7 can be maximized, and the smoke can quickly pass through the convection heat exchange channel 7 and be discharged from the smoke exhaust port 5 .

[0037] like Figure 1 As shown, the inner diameter D of the inner ring coil 2 is ≥3m; specifically, setting the inner diameter of the inner ring coil 2 to be above 3m can prevent the flame of the burner 4 burning in the radiation heat exchange chamber 6 from being too large and affecting the safety of the inner ring coil 2, and can avoid the furnace tube 13 in the inner ring coil 2 from being burned through; in this embodiment, the width B of the convection heat exchange channel 7 is 0.57m, and the inner diameter D of the inner ring coil 2 is 3.4m.

[0038] like Figure 1 As shown, the lower end of the inner ring coil 2 is connected to the bottom of the furnace body 1.

[0039] like Figure 1 As shown, the blast furnace gas-fired high-temperature binary molten salt furnace may also include a top coil 9 and an insulating sealed top cover 10, wherein the top coil 9 is connected to the upper end of the outer ring coil 3 and extends inward, and the insulating sealed top cover 10 is connected to the top coil 9; specifically, when the flue gas is in the radiation heat exchange chamber 6, it will perform radiation heat exchange with the inner ring coil 2, the upper end of the outer ring coil 3 and the top coil 9, and when the flue gas is in the convection heat exchange channel 7, it will perform convection heat exchange with the inner ring coil 2 and the outer ring coil 3.

[0040] like Figures 1 to 3 As shown, the blast furnace gas-fired high-temperature binary molten salt furnace further includes an upper header 11 and a lower header 12;

[0041] The lower header 12 is connected to the lower end of the inner coil 2 and the lower end of the outer coil 3 respectively;

[0042] The upper end of the outer coil 3 is connected to one end of the top coil 9;

[0043] The other end of the top coil 9 and the upper end of the inner coil 2 are respectively connected to the upper header 11; specifically, the heat transfer medium first flows into the lower header 12, and then the heat transfer medium in the lower header 12 flows into the inner coil 2 and then into the upper header 11 in one way, and flows into the outer coil 3 in the other way and then flows into the top coil 9 and then into the upper header 11, and the heat transfer medium in the upper header 11 flows into the pipeline of the heating circulation system; more specifically, the flue gas in the convection heat exchange channel 7 flows downward, and the heat transfer medium in the inner coil 2 and the outer coil 3 flows upward, thereby realizing full countercurrent convection heat exchange between the flue gas and the heat transfer medium, which is beneficial to improving the efficiency of convection heat exchange.

[0044] In this embodiment, the outer coil 3 and the top coil 9 are formed by winding a plurality of furnace tubes 13 in parallel in an integrated manner;

[0045] The inner coil 2 is also formed by winding a plurality of furnace tubes 13 in parallel;

[0046] The lower end of the furnace tube 13 extends out of the furnace body 1 and is connected to the lower header 12, and the upper end of the furnace tube 13 extends out of the furnace body 1 and is connected to the upper header 11;

[0047] A temperature sensor 14 is connected to the portion of the upper end of each furnace tube 13 extending out of the furnace body 1 .

[0048] Specifically, the thermal insulation sealing top cover 10 may be made of high temperature resistant ceramic fiber.

[0049] like Figures 1 to 3 As shown, the top of the furnace body 1 and the bottom of the furnace body 1 are respectively provided with inspection manholes 15, and the furnace body 1 is also connected with a ladder 16 to facilitate daily inspection of the furnace body 1. The blast furnace gas-fired high-temperature binary molten salt furnace of the embodiment of the present application can provide users with a molten salt heat source of about 550°C, and is very convenient to transport.

[0050] In summary, the fuel used by the burner 4 is blast furnace gas, and the burner 4 burns in the radiation heat exchange chamber 6 to generate a large amount of flue gas, which flows upward and flows from the upper end of the radiation heat exchange chamber 6 into the upper end of the convection heat exchange channel 7, and then flows downward through the convection heat exchange channel 7 and is discharged from the exhaust port 5. Among them, only the convection heat exchange channel 7 is provided between the inner coil 2 and the furnace body 1 for the flue gas to flow through, so the width B of the convection heat exchange channel 7 can be set larger. In this embodiment, the width B of the convection heat exchange channel 7 is ≥ 0.5m, so when the flue gas flows through the convection heat exchange channel 7, the flow resistance is small and the flow rate is large, so that the flue gas can quickly pass through the convection heat exchange channel 7 and be discharged from the exhaust port 5, so that the flue gas discharge is smoother, so that the large amount of flue gas generated when the burner 4 burns blast furnace gas can be discharged quickly and efficiently, and the flue gas is prevented from accumulating in the furnace body 1.

[0051] The specific embodiments described above further illustrate the technical problems, technical solutions and beneficial effects solved by the present invention. It should be understood that the above are only specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A high-temperature binary molten salt furnace fueled by blast furnace gas, characterized in that: It comprises a furnace body (1), an inner coil (2), an outer coil (3) and a burner (4); The lower end of the furnace body (1) is provided with a smoke exhaust port (5); The inner coil (2) and the outer coil (3) are both installed in the furnace body (1), and the inner coil (2) is located on the inner side of the outer coil (3); A radiation heat exchange chamber (6) is provided on the inner side of the inner coil (2), a convection heat exchange channel (7) is provided between the inner coil (2) and the outer coil (3), an upper end of the radiation heat exchange chamber (6) is communicated with an upper end of the convection heat exchange channel (7), a lower end of the convection heat exchange channel (7) is communicated with the smoke exhaust port (5), and a width B of the convection heat exchange channel (7) is ≥ 0.5 m; The bottom of the furnace body (1) is provided with a mounting opening (8) which is in communication with the radiation heat exchange chamber (6); The burner (4) is connected to the installation port (8) and is used to burn in the radiation heat exchange chamber (6) to generate flue gas.

2. The blast furnace gas-fired high-temperature binary molten salt furnace according to claim 1, characterized in that: The outer coil (3) is arranged close to the inner wall of the furnace body (1).

3. The high-temperature binary molten salt furnace fueled by blast furnace gas according to claim 1, characterized in that: The inner diameter D of the inner coil (2) is ≥ 3 m.

4. The high-temperature binary molten salt furnace fueled by blast furnace gas according to claim 1, characterized in that: The lower end of the inner coil (2) is connected to the bottom of the furnace body (1).

5. The blast furnace gas-fired high-temperature binary molten salt furnace according to claim 1, characterized in that: It also comprises a top coil pipe (9) and a heat-insulating sealing top cover (10), wherein the top coil pipe (9) is connected to the upper end of the outer ring coil pipe (3) and extends inwardly, and the heat-insulating sealing top cover (10) is connected to the top coil pipe (9).

6. The high-temperature binary molten salt furnace fueled by blast furnace gas according to claim 5, characterized in that: It also includes an upper header (11) and a lower header (12); The lower header (12) is respectively connected to the lower end of the inner ring coil (2) and the lower end of the outer ring coil (3); The upper end of the outer coil (3) is in communication with one end of the top coil (9); The other end of the top coil pipe (9) and the upper end of the inner ring coil pipe (2) are respectively connected to the upper header (11).

7. The high temperature binary molten salt furnace fueled by blast furnace gas according to claim 6, characterized in that: The outer coil (3) and the top coil (9) are formed as one piece by winding a plurality of furnace tubes (13) in parallel; The inner coil (2) is also formed by winding a plurality of furnace tubes (13) in parallel; The lower end of the furnace tube (13) extends out of the furnace body (1) and is connected to the lower header (12), and the upper end of the furnace tube (13) extends out of the furnace body (1) and is connected to the upper header (11).

8. The high-temperature binary molten salt furnace fueled by blast furnace gas according to claim 7, characterized in that: A temperature sensor (14) is connected to the portion of the upper end of each furnace tube (13) that extends outside the furnace body (1).

9. The high-temperature binary molten salt furnace fueled by blast furnace gas according to claim 5, characterized in that: The thermal insulation sealing top cover (10) is made of high temperature resistant ceramic fiber.

10. The high-temperature binary molten salt furnace fueled by blast furnace gas according to claim 1, characterized in that: The top of the furnace body (1) and the bottom of the furnace body (1) are respectively provided with inspection manholes (15), and the furnace body (1) is also connected to a ladder (16).

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