Fused salt radiation type heat absorber for settling chamber of electric furnace waste heat boiler

Abstract

The utility model relates to the field of heat absorbers of electric furnace settling chambers, and discloses a fused salt radiation type heat absorber of an electric furnace waste heat boiler settling chamber, which comprises a heat absorber body, the heat absorber body comprises a plurality of groups of radiation type heating surfaces, the radiation type heating surfaces are arranged along the inner wall of the settling chamber, and the inner sides of the radiation type heating surfaces define a cavity; and the fused salt circulates in the radiation type heating surface and absorbs heat in the high-temperature flue gas entering the settling chamber. The system has the advantages that waste heat in high-temperature flue gas can be fully utilized, energy is further saved, consumption is further reduced, the efficiency of the saturated steam generator set is improved, stability is good, and economic benefits are high.

Description

TECHNICAL FIELD

[0001] The utility model relates to the heat absorber field of electric furnace settling chamber, especially to the molten salt radiation type heat absorber of electric furnace waste heat boiler settling chamber. BACKGROUND

[0002] Energy saving and consumption reduction is the current world's development theme, and the recycling of waste heat resources is one of the effective ways to save energy and reduce pollution. The high-temperature flue gas generated in the smelting process of the electric furnace enters the waste heat boiler and is cooled to below 200 DEG C after passing through the membrane wall, evaporator, coal economizer and other heating surfaces, and the flue gas is discharged after being purified after recovering the waste heat of the electric furnace. The steam generated by the evaporator of the waste heat boiler is sent to the steam turbine generator set for power generation, which utilizes the heat in the high-temperature flue gas discharged from the electric furnace, realizes environmental governance and energy saving and consumption reduction, and increases the economic benefits of enterprises. However, due to the fact that the temperature of the flue gas discharged from the electric furnace in the smelting process is constantly changing and periodically fluctuating, the steam generated by the evaporator of the waste heat boiler is unstable and cannot provide continuous and stable steam (superheated source) for the steam turbine generator set.

[0003] In order to ensure the stable operation of the steam turbine generator set, a heat accumulator needs to be configured at the outlet of the waste heat boiler to stabilize the flow and pressure of the steam generated by the evaporator, so as to generate continuous and stable low-pressure steam. However, the power generation efficiency of low-pressure steam is low, and there is erosion to the turbine blades. Some units use a gas and steam superheater to superheat the saturated steam from the heat accumulator and then send it into the steam turbine generator set for power generation. Since the gas superheater improves the steam quality by consuming gas to improve the power generation efficiency, its economy is relatively low. UTILITY MODEL CONTENTS

[0004] In order to overcome the problem of low economy of the method of providing a superheated source for a saturated steam generator set in the above background technology, the utility model provides a molten salt radiation type heat absorber for the settling chamber of an electric furnace waste heat boiler. The molten salt flows through the radiation type heat absorber and absorbs the waste heat in the high-temperature flue gas flowing into the settling chamber to store heat. The heat stored in the molten salt can heat the low-pressure saturated steam at the outlet of the heat accumulator to become stable superheated steam. This has the beneficial effects of being able to make more full use of the waste heat in the high-temperature flue gas, further saving energy and reducing consumption, improving the efficiency of the saturated steam generator set, good stability and high economic benefits.

[0005] The technical scheme of the utility model is as follows:

[0006] The molten salt radiation type heat absorber for the settling chamber of an electric furnace waste heat boiler comprises a heat absorber body, the heat absorber body comprises a plurality of groups of radiation type heating surfaces, the radiation type heating surfaces are arranged along the inner wall of the settling chamber, and a cavity is surrounded on the inner side of the radiation type heating surfaces. The molten salt flows through the radiation type heating surfaces and absorbs the heat in the high-temperature flue gas entering the settling chamber.

[0007] Compared with the prior art, the technical scheme has the beneficial effects that:

[0008] (1) The radiation heat absorber provided by the present application can store heat by absorbing the waste heat in the high-temperature flue gas in the settling chamber through the molten salt in the radiation heat receiving surface, has the effects of being able to fully utilize the waste heat in the high-temperature flue gas, improving the utilization rate of the flue gas waste heat, and being economical.

[0009] (2) The molten salt flows through the radiation heat absorber, is heated by the high-temperature flue gas of the electric furnace and stores heat energy, and can continuously superheat the saturated steam discharged from the outlet of the heat accumulator in the heat releasing stage, so as to provide a stable superheating source for the saturated steam generator set, convert the intermittent and fluctuating flue gas waste heat into stable and continuous superheated steam, and improve the power generation efficiency and energy utilization efficiency without consuming other gas energy to improve the quality of the saturated steam discharged from the outlet of the heat accumulator, thereby achieving high economic benefits and being an important way to achieve energy saving and emission reduction.

[0010] (3) The heat receiving surface is arranged on the wall surface of the settling chamber, does not occupy the space of the settling chamber, and can be applied to new projects and is more convenient to apply to the modification project of the existing electric furnace waste heat boiler. The heat absorber body is arranged relatively independently of the water tube boiler body, the heating of the molten salt is completed without occupying the space of the heat receiving surface of the waste heat boiler, and the coupling with the waste heat boiler is realized.

[0011] Preferably, the radiation heat receiving surface is provided with four groups, the four groups of radiation heat receiving surfaces are connected in series and / or in parallel with each other, and are arranged along the top wall, the rear wall and the two side walls of the settling chamber respectively, and the front wall of the settling chamber is provided with a gate for the entry and exit of a forklift.

[0012] Further preferably, the top wall of the settling chamber is provided with an inlet and an outlet, the flue gas enters the settling chamber from the inlet, and enters the waste heat boiler from the outlet; and the radiation heat receiving surface located on the top wall of the settling chamber is arranged at the gap between the inlet and the outlet.

[0013] Further preferably, each group of radiation heat receiving surfaces comprises a plurality of heat receiving surface modules connected in series and / or in parallel, the inlet end and the outlet end of the heat exchange pipe of each heat receiving surface module are respectively connected with an inlet pipe and an outlet pipe, the inlet pipe and the outlet pipe of adjacent heat receiving surface modules are correspondingly communicated, and each heat receiving surface module is provided with an isolation valve on the inlet pipe and the outlet pipe.

[0014] Further preferably, the inlet pipe and the outlet pipe of each heat receiving surface module are further connected through a bypass pipe, and the bypass pipe is provided with a bypass valve.

[0015] Further preferably, the inlet pipe and the outlet pipe are arranged outside the settling chamber; the inlet pipe is further provided with a salt discharge valve, the salt discharge valve is located between the inlet end of the heat exchange pipe and the isolation valve, and the outlet end of the salt discharge valve is communicated with a salt discharge tank.

[0016] Further preferably, the total inlet of the heat absorber body is located below the bottom of the back wall of the settling chamber and communicates with two heat receiving surface modules in the back wall of the settling chamber, the two heat receiving surface modules in the back wall of the settling chamber respectively communicate with the radiation heat receiving surfaces of the two side walls one by one, and the total outlet of the heat absorber body is located above the top of the back wall of the settling chamber and communicates with the radiation heat receiving surfaces of the two side walls of the settling chamber; the molten salt in the radiation heat receiving surfaces of the back wall and the two side walls of the settling chamber respectively flows from bottom to top; the low position of the heat absorber body is provided with a salt drainage valve, and the high position is provided with an exhaust valve.

[0017] Further preferably, the heat exchange pipe is a serpentine pipe, and the serpentine pipe is arranged in a single layer, a staggered double layer or a multi-layer.

[0018] Preferably, one side of the radiation heat receiving surface close to the inner wall of the settling chamber is arranged with a plurality of pipe clamps at intervals, each pipe clamp is uniformly provided with a plurality of buckles or pins fixedly connected with the inner wall of the settling chamber along the length direction of the pipe clamp, and the top end of each pipe clamp is suspended at the top of the back wall and the two side walls of the settling chamber.

[0019] Preferably, the lowest point of the radiation heat receiving surface is spaced apart from the bottom surface of the settling chamber by a distance of greater than or equal to 2 m. BRIEF DESCRIPTION OF DRAWINGS

[0020] The utility model will be explained in the mode of referring to the drawings, wherein:

[0021] Fig. 1 It is the whole structure schematic view of the utility model;

[0022] Fig. 2 It is the radiation heat receiving surface structure schematic view of the back wall of the settling chamber of the utility model;

[0023] Fig. 3 It is the radiation heat receiving surface structure schematic view of one side wall of the settling chamber of the utility model;

[0024] Fig. 4 It is the radiation heat receiving surface structure schematic view of the other side wall of the settling chamber of the utility model.

[0025] Drawing reference: settling chamber 1, back wall 11, side wall 12, total inlet 13, total outlet 14, front wall 15, radiation heat receiving surface 2, heat exchange pipe 21, heat receiving surface module 3, inlet pipe 31, salt drainage valve 311, outlet pipe 32, isolation valve 33, connecting pipe 34, bypass pipe 35, bypass valve 351, exhaust valve 36, pipe clamp 4. DETAILED DESCRIPTION

[0026] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0027] Example 1: The high-temperature flue gas generated during the smelting process of the electric furnace first passes through a gravity settling chamber to settle large particles of ash and foamy slag in the flue gas. After primary dust removal, the flue gas is led to the waste heat boiler. The high-temperature flue gas entering the settling chamber 1 has a high temperature (the highest temperature can reach 1200°). If the high-temperature section of the waste heat in the high-temperature flue gas entering the settling chamber 1 can be absorbed and stored, the stored heat can be used to superheat the saturated steam of the heat accumulator, thereby improving the power generation efficiency, stability and service life of the steam turbine generator set.

[0028] like Figs. 1 to 4 The molten salt radiant heat absorber for the settling chamber of the waste heat boiler shown includes a heat absorber body, which comprises several sets of radiant heating surfaces 2. Each set of radiant heating surfaces consists of several interconnected heat exchange tubes 21. The radiant heating surfaces 2 are arranged along the inner wall of the settling chamber 1, i.e., close to and parallel to the inner wall of the settling chamber 1. The inner sides of all the radiant heating surfaces 2 form a cavity. The high-temperature flue gas entering the settling chamber exchanges heat with the radiant heating surfaces 2, and some of the dust in the high-temperature flue gas settles in the cavity. Molten salt flows within the heat exchange tubes 21 and absorbs heat from the high-temperature flue gas entering the settling chamber 1. After being heated to the rated temperature, the molten salt stores heat and is used to superheat the low-pressure saturated steam at the outlet of the accumulator.

[0029] During operation, molten salt at room temperature enters the heat exchange tubes 21 of the radiant heating surface 2 from the main inlet 13 of the absorber body via a molten salt pump. High-temperature flue gas (temperature can reach 300-1200℃) discharged from the electric furnace during smelting enters the sedimentation chamber. The high-temperature flue gas comes into contact with the radiant heating surface 2 and exchanges heat with the molten salt in the heat exchange tubes 21. The molten salt continuously absorbs heat from the high-temperature flue gas. After absorbing heat, the temperature of the molten salt reaches 560℃. Finally, it is discharged through the main outlet 14 of the absorber body to the accumulator position. When releasing heat, it can superheat the saturated steam at the outlet of the accumulator, providing a stable superheat source for the steam turbine generator set.

[0030] The radiant heat absorber provided in the embodiment absorbs the waste heat in the high-temperature flue gas in the settling chamber 1 through the molten salt in the radiant heating surface 2, has the effect of being able to fully utilize the waste heat in the high-temperature flue gas, improving the flue gas waste heat utilization rate, and being economical; the molten salt flows through the radiant heat absorber, is heated by the high-temperature flue gas of the electric furnace and stores heat energy, and can continuously superheat the saturated steam discharged from the outlet of the heat accumulator in the heat release stage, can provide a stable superheating source for the saturated steam generator set, convert the intermittent and fluctuating flue gas waste heat into stable and continuous superheated steam, does not need to consume other gas energy to improve the quality of the saturated steam discharged from the outlet of the heat accumulator to improve the power generation efficiency and energy utilization efficiency, has high economic benefits, and is an important way to realize energy saving and emission reduction; in addition, since the heating surface is arranged on the wall surface of the settling chamber 1, it does not occupy the space of the settling chamber 1, that is, it can be applied to new projects, and is more convenient to apply to the transformation project of the existing electric furnace waste heat boiler. The heat absorber body is arranged relatively independently of the water tube boiler body, and the heating of the molten salt is completed without occupying the space of the heating surface of the waste heat boiler, so that the coupling with the waste heat boiler is realized.

[0031] In embodiment 2, the radiant heating surface 2 is optimally designed on the basis of embodiment 1. The radiant heating surface 2 is provided with 4 groups which are in series or / and in parallel with each other, and is arranged along the top wall, the back wall 11 and the two side walls 12 of the settling chamber 1 respectively, that is, the 4 groups of radiant heating surfaces 2 are communicated one by one, and are arranged close to the inner wall of the top wall, the inner wall of the back wall 11 and the inner wall of the two side walls 12 of the settling chamber 1 respectively, while the front wall 15 of the settling chamber 1 is not arranged with the radiant heating surface 2, but is provided with a large door for the forklift to enter and exit. The dust deposited in the settling chamber 1 in the high-temperature flue gas is deposited in the cavity surrounded by the radiant heating surface 2, and the forklift enters from the large door to shovel the dust.

[0032] The top wall of the settling chamber 1 is provided with an inlet and an outlet, the high-temperature flue gas discharged from the electric furnace enters the settling chamber 1 from the inlet, and after heat release, enters the waste heat boiler from the outlet, while the radiant heating surface 2 located on the top wall of the settling chamber 1 is arranged at the gap between the inlet and the outlet, that is, the radiant heating surface 2 on the top wall of the settling chamber 1 does not overlap with the inlet and the outlet, so as to avoid affecting the entry and exit of the high-temperature flue gas in the settling chamber 1.

[0033] Preferably, each group of radiant heat receiving surface 2 comprises a plurality of heat receiving surface modules 3 connected in series or / and in parallel, the number of heat receiving surface modules 3 contained in each group of radiant heat receiving surface 2 is determined according to the size of heat receiving surface module 3 and the size of the inner wall of the settling chamber 1 arranged. In the embodiment, the radiant heat receiving surface 2 of the rear wall 11 comprises two groups of heat receiving surface modules 3 connected in parallel, and each of the two side walls 12 is provided with four groups of heat receiving surface modules 3 connected in series, and the two groups of heat receiving surface modules 3 of the rear wall 11 are connected in series with the heat receiving surface modules 3 of the two side walls respectively, and are connected in series with the radiant heat receiving surface 2 of the top wall uniformly. The series-parallel connection form is not limited to the series-parallel connection form described in the embodiment, and can be selected according to the size of the settling chamber, the heat storage capacity of the molten salt and parameters.

[0034] The inlet end and the outlet end of the heat exchange pipe 21 of each heat receiving surface module 3 are connected and communicated with one end of the inlet pipe 31 and the outlet pipe 32 respectively, and the other end of the inlet pipe 31 and the outlet pipe 32 of the adjacent heat receiving surface module 3 are communicated one by one through the connecting pipe 34, that is, the inlet pipe 31 of the heat receiving surface module 3 is communicated with the outlet pipe 32 of one of the adjacent heat receiving surface modules 3 through the connecting pipe 34, and the outlet pipe 32 is also communicated with the inlet pipe 31 of the other adjacent heat receiving surface module 3 through the connecting pipe 34. The molten salt passes through each heat receiving surface module 3 in the radiant heat receiving surface 2, and each heat receiving surface module 3 is provided with an isolation valve 33 on the inlet pipe 31 and the outlet pipe 32.

[0035] When the heat absorber is running, all the isolation valves 33 are opened, the low-temperature molten salt enters the radiant heat receiving surface 2 through the total inlet 13 of the heat absorber body, and then enters the heat receiving surface module 3 in the radiant heat receiving surface 2 through the connecting pipe 34, the inlet pipe 31 and the outlet pipe 32. After fully exchanging heat with the high-temperature flue gas, it is discharged through the total outlet 14 of the heat absorber body.

[0036] Further preferably, the distal end of the inlet pipe 31 and the outlet pipe 32 of each heat receiving surface module 3 (i.e. the end away from the heat exchange pipe 21 in the heat receiving surface module 3) is also connected through a bypass pipe 35. The bypass pipe 35 connects the inlet pipe 31 and the outlet pipe 32 of each heat receiving surface module 3, and a bypass valve 351 is arranged on the bypass pipe 35. When the heat absorber is running, all the bypass valves 351 are closed, and when an accident occurs in a certain heat receiving surface module 3 (such as heat receiving surface leakage), the bypass valve 351 of the heat receiving surface module 3 is opened, and the isolation valve 33 of the heat receiving surface module 3 is closed, so that the heat receiving surface module 3 is cut off, and the molten salt no longer passes through the heat exchange pipe 21 of the heat receiving surface module 3, but passes through the bypass pipe 35 of the heat receiving surface module 3.

[0037] Further preferably, the inlet pipe 31 and the outlet pipe 32 are arranged outside the settling chamber 1, which facilitates the installation of various pipes and the adjustment of the opening and closing of various valves (such as the isolation valve 33) installed on the pipes. The inlet pipe 31 is further provided with desalination valves 311, which are located between the inlet ends of the heat exchange pipes 21 and the isolation valve 33 and are in communication with the desalination tank. When the heat absorber is in operation, all the desalination valves 311 are closed. When an accident condition (such as a leak in the heat receiving surface) occurs in a certain heat receiving surface module 3, the desalination valves 311 of the heat receiving surface module 3 are opened after the module 3 is cut off, so that the accumulated salt in the heat exchange pipes 21 of the heat receiving surface module 3 is discharged, thereby preventing the accumulated salt from overheating and deteriorating. In addition, when the heat receiving surface is disabled or switched, the desalination valves 311 are opened to discharge the accumulated salt in the heat exchange pipes 21 of each heat receiving surface module 3, and the discharged molten salt is discharged into the desalination tank through the desalination valves 311. Furthermore, the division of each group of radiation heat receiving surfaces 2 into multiple heat receiving surface modules 3 facilitates the treatment of the molten salt in the heat exchange pipes 21 of each heat receiving surface module 3 and the discharge of the accumulated salt in the heat exchange pipes 21 of the heat receiving surface module 3 when the heat receiving surface is disabled or switched or when a problem occurs in the heat receiving surface module 3.

[0038] Further preferably, the radiation heat receiving surface 2 arranged on the rear wall 11 of the settling chamber 1 includes two heat receiving surface modules 3, the total inlet 13 of the heat absorber body is located below the bottom of the rear wall 11 of the settling chamber 1 and is in communication with the two heat receiving surface modules 3 in the rear wall 11 of the settling chamber 1 through the connecting pipes 34, the two heat receiving surface modules 3 in the rear wall 11 of the settling chamber 1 are respectively in one-to-one correspondence with the radiation heat receiving surfaces 2 of the two side walls 12 of the settling chamber 1 through the connecting pipes 34, and the total outlet 14 of the heat absorber body is located above the top of the rear wall 11 of the settling chamber 1 and is in communication with the radiation heat receiving surfaces 2 of the two side walls 12 of the settling chamber 1. The molten salt enters the radiation heat receiving surface 2 arranged on the rear wall 11 of the settling chamber 1 from the total inlet 13 of the heat absorber body through the total connecting pipe 34, then flows through the two heat receiving surface modules 3 in the rear wall 11 of the settling chamber 1 through the two branch connecting pipes 34, respectively, and then flows into the corresponding radiation heat receiving surfaces 2 of the side walls 12 through different connecting pipes 34, and finally flows into the connecting pipe 34 at the total outlet 14 of the heat absorber body and flows out from the total outlet 14.

[0039] The top wall of the settling chamber 1 can also be selectively arranged with the radiation heat receiving surface 2. Since the top wall of the settling chamber 1 is provided with an inlet and an outlet, if the radiation heat receiving surface 2 is arranged on the top wall of the settling chamber 1, the area of the radiation heat receiving surface 2 is relatively small and the heat absorption capacity is relatively low. If it is necessary to arrange the radiation heat receiving surface 2 on the top wall of the settling chamber 1, a heat receiving surface module 3 can be added to the rear wall 11 of the settling chamber 1 to communicate with the radiation heat receiving surface 2 on the top wall.

[0040] A salt rejection valve 311 is arranged at the low position of the heat absorber body, i.e. at the lowest position of the connecting pipe 34 between the total inlet 13 of the heat absorber body and the radiation heat receiving surface 2 of the side wall 12 of the settling chamber 1, which is beneficial to drain the salt accumulated in the heat exchange pipe 21 when the heat receiving surface is disabled and switched. An exhaust valve 36 is arranged at the high position of the heat absorber body, i.e. at the highest position of the connecting pipe 34 between the total outlet 14 of the heat absorber body and the radiation heat receiving surface 2 of the side wall 12 of the settling chamber 1, which is beneficial to drain the gas in the heat exchange pipe 21 when the heat receiving surface is disabled and switched. In addition, the total inlet 13 and the total outlet 14 of the heat absorber body are respectively provided with a total switch valve on the connecting pipe 34.

[0041] Further preferably, the heat exchange pipe 21 is a serpentine pipe arranged in a single layer, a staggered double layer or a multi-layer, which is beneficial to improve the area utilization rate of the settling chamber 1.

[0042] In Example 3, on the basis of Example 1, a plurality of pipe clamps 4 are arranged at intervals on one side of the radiation heat receiving surface 2 close to the inner wall of the settling chamber 1, and the pipe clamps 4 are clamped on the heat exchange pipe 21. Each row of pipe clamps 4 is provided with a plurality of buckles or pins fixed to the inner wall of the settling chamber 1 at intervals along the length direction of the pipe clamps 4, and the interval distance between adjacent buckles or pins is the same. One end of the buckle or pin clamps the pipe clamp 4, and the other end is embedded in the inner wall of the settling chamber 1. The pipe clamp 4 and the buckle or pin can prevent the radiation heat receiving surface 2 from shaking. The top end of each row of pipe clamps 4 is suspended at the top of the rear wall 11 and the two side walls 12 of the settling chamber 1, and bears the weight of the radiation heat receiving surface 2.

[0043] In Example 4, on the basis of Example 1, the lowest point of the radiation heat receiving surface 2 is spaced apart from the bottom surface of the settling chamber 1 by a distance greater than or equal to 2 m, which prevents the shovel from colliding with the heat receiving surface during the ash removal operation of the shovel entering the settling chamber 1, and causes the heat receiving surface to leak.

[0044] The above examples only express the specific embodiments of the present application, and the description is more specific and detailed, but it cannot be understood as a limitation on the protection scope of the present application. It should be noted that for ordinary skilled persons in the art, without departing from the technical concept of the present application, a number of modifications and improvements can be made, which are within the protection scope of the present application.

Claims

1. A molten salt radiant heat absorber for the settling chamber of an electric furnace waste heat boiler, characterized in that: The absorber body includes several sets of radiant heating surfaces (2), which are arranged along the inner wall of the settling chamber (1) and form a cavity on their inner side; molten salt flows in the radiant heating surfaces (2) and absorbs the heat from the high-temperature flue gas entering the settling chamber (1).

2. The molten salt radiant heat absorber for the settling chamber of an electric furnace waste heat boiler according to claim 1, characterized in that: The radiant heating surface (2) is provided in 4 groups. The 4 groups of radiant heating surfaces (2) are connected in series and / or in parallel, and are arranged along the top wall, rear wall (11) and side walls (12) of the settling chamber (1). The front wall (15) of the settling chamber (1) is provided with a door for the loader to enter and exit.

3. The molten salt radiant heat absorber for the settling chamber of an electric furnace waste heat boiler according to claim 2, characterized in that: The settling chamber (1) has a flue gas inlet and a flue gas outlet on its top wall. The flue gas enters the settling chamber (1) through the flue gas inlet and enters the waste heat boiler through the flue gas outlet. The radiant heating surface (2) on the top wall of the settling chamber (1) is arranged in the gap between the flue gas inlet and the flue gas outlet.

4. The molten salt radiant heat absorber for the settling chamber of an electric furnace waste heat boiler according to claim 2, characterized in that: Each group of radiant heating surfaces (2) includes multiple heating surface modules (3) connected in series and / or in parallel. The inlet end and outlet end of the heat exchange tube (21) of each heating surface module (3) are respectively connected to an inlet pipe (31) and an outlet pipe (32). The inlet pipe (31) and outlet pipe (32) of adjacent heating surface modules (3) are connected in a one-to-one correspondence. Each heating surface module (3) is equipped with an isolation valve (33) on its inlet pipe (31) and outlet pipe (32).

5. The molten salt radiant heat absorber for the settling chamber of an electric furnace waste heat boiler according to claim 4, characterized in that: The far ports of the inlet pipe (31) and outlet pipe (32) of each heated surface module (3) are also connected by a bypass pipe (35), and a bypass valve (351) is provided on the bypass pipe (35).

6. The molten salt radiant heat absorber for the settling chamber of an electric furnace waste heat boiler according to claim 5, characterized in that: The inlet pipe (31) and outlet pipe (32) are arranged outside the settling chamber (1); the inlet pipe (31) is also equipped with a salt drain valve (311), which is located between the inlet end of the heat exchange tube (21) and the isolation valve (33), and the outlet end of the salt drain valve (311) is connected to the salt discharge tank.

7. The molten salt radiant heat absorber for the settling chamber of an electric furnace waste heat boiler according to claim 4, characterized in that: The main inlet (13) of the absorber body is located below the bottom of the rear wall (11) of the settling chamber (1) and is connected to the two heating surface modules (3) in the rear wall (11) of the settling chamber (1). The two heating surface modules (3) in the rear wall (11) of the settling chamber (1) are connected to the radiant heating surfaces (2) of the two side walls (12) respectively. The main outlet (14) of the absorber body is located above the top of the rear wall (11) of the settling chamber (1) and is connected to the radiant heating surfaces (2) of the two side walls (12) of the settling chamber (1). The molten salt in the rear wall (11) and the radiant heating surfaces (2) of the two side walls (12) of the settling chamber (1) flows from bottom to top. A salt-removing valve (311) is provided at the low position of the absorber body and an exhaust valve (36) is provided at the high position.

8. The molten salt radiant heat absorber for the settling chamber of an electric furnace waste heat boiler according to claim 4, characterized in that: The heat exchange tube (21) is a serpentine tube, which can be arranged in a single layer, an alternating double layer, or a multi-layer arrangement.

9. The molten salt radiant heat absorber for the settling chamber of an electric furnace waste heat boiler according to claim 1, characterized in that: The radiant heating surface (2) is provided with several rows of pipe clamps (4) at intervals on the side near the inner wall of the settling chamber (1). Each row of pipe clamps (4) is provided with several buckles or pins along its length and is fixedly connected to the inner wall of the settling chamber (1). The top of each row of pipe clamps (4) is suspended on the top of the rear wall (11) and the two side walls (12) of the settling chamber (1).

10. The molten salt radiant heat absorber for the settling chamber of an electric furnace waste heat boiler according to claim 1, characterized in that: The distance between the lowest point of the radiant heating surface (2) and the bottom surface of the settling chamber (1) is ≥2m.

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