Waste salt treatment method based on resource recycling system of concentrated solar thermal pyrolysis

Abstract

The application relates to the technical field of resource recycling, and particularly discloses a resource recycling system based on concentrated solar pyrolysis, which comprises a feeding bin, a multistage heat absorption channel and a plurality of light concentrating components; the multistage heat absorption channel is internally provided with a plurality of flow guide plates, and the multistage heat absorption channel is internally configured to form a waste salt flow channel through the plurality of flow guide plates; the feeding bin is configured to be in communication with the multistage heat absorption channel; the multistage heat absorption channel is provided with at least one light transmission part for allowing a focused light source to enter the waste salt flow channel; the flow guide plates and / or the multistage heat absorption channel are provided with at least one reflection part for reflecting the light source; the resource recycling system based on concentrated solar pyrolysis can store and utilize the product salt after high-temperature pyrolysis as a molten salt material, can adopt pyrolytic carbon material as a molten salt thermal physical property enhancer, and can improve the cleanliness and resource property of the product.

Description

Technical Field

[0001] This invention relates to the field of resource recycling technology, and more specifically to a resource recycling system based on concentrated solar pyrolysis. Background Technology

[0002] Processes such as fine chemical manufacturing and petroleum refining inevitably generate large amounts of industrial waste salts. The disposal of this waste salt is difficult and costly, and it poses a significant threat to the environment. Without proper treatment, it will directly cause environmental pollution and resource waste. Therefore, the treatment and recycling of industrial waste salts are of great importance to environmental management and enterprise development.

[0003] Waste salt typically consists mainly of NaCl and Na2SO4, and contains a large amount of pollutants. Given the relatively low stability of organic pollutants at high temperatures, thermal treatment has become a common and effective method for removing organic pollutants from waste salt. Through high-temperature pyrolysis, organic pollutants react to generate some carbonaceous materials; however, current industrial waste salt treatment technologies only involve simple separation and purification, leading to a waste of these resources.

[0004] Solar energy, as an abundant, clean, and reliable renewable energy source, can provide a large amount of energy. However, traditional industrial waste salt treatment and disposal technologies are extremely energy-intensive. Applying solar concentrating technology to industrial waste salt treatment and disposal could save a significant amount of energy. Furthermore, industrial waste salt is rich in molten salt thermal storage materials; if these materials can be recycled and reused, the challenges of both waste treatment and the low-cost development of molten salt thermal storage materials can be solved simultaneously. Summary of the Invention

[0005] The technical problem to be solved by this invention is to provide a resource recycling system based on concentrated solar pyrolysis, which effectively improves the decomposition rate of organic matter and energy utilization. The product salt is used as a molten salt material for heat storage and utilization, and the pyrolysis carbon material is used as a molten salt thermophysical property enhancer, which improves the cleanliness and resource utilization of the product. At the same time, it solves the problems of waste treatment and low-cost development of molten salt heat storage materials.

[0006] To solve the above problems, the present invention adopts the following technical solution:

[0007] A resource recycling system based on concentrated solar pyrolysis includes: a feed hopper, a multi-stage heat absorption channel, and multiple concentrating components.

[0008] The feed hopper is used to store industrial waste salt and enhanced light-absorbing materials.

[0009] The multi-stage heat absorption channel has multiple guide plates inside, and the multi-stage heat absorption channel is configured to form a waste salt flow channel through the multiple guide plates.

[0010] The plurality of focusing components are used to provide a focused light source for the waste salt flow channel.

[0011] The inlet bin is configured to communicate with the multi-stage heat absorption channel.

[0012] The multi-stage heat absorption channel has at least one light transmission site for the focused light source to enter the waste salt flow channel.

[0013] The flow guide plate and / or the multi-stage heat absorption channel has at least one reflection part for reflecting the light source in the waste salt flow channel.

[0014] The flow guide plate is hingedly connected to the multi-stage heat absorption channel, and an adjusting device is arranged between the flow guide plate and the multi-stage heat absorption channel, and the adjusting device is used to adjust the inclination of the flow guide plate.

[0015] In the resource recycling system based on concentrated solar thermal pyrolysis provided by at least one embodiment of the present disclosure, the waste salt flow channel is arranged in an S shape.

[0016] In the resource recycling system based on concentrated solar thermal pyrolysis provided by at least one embodiment of the present disclosure, the bottom of the inlet bin has a feeding port, and the multi-stage heat absorption channel and the inlet bin communicate through the feeding port.

[0017] The inlet bin is fixedly arranged at the top end of the multi-stage heat absorption channel.

[0018] In the resource recycling system based on concentrated solar thermal pyrolysis provided by at least one embodiment of the present disclosure, the bottom end of the multi-stage heat absorption channel is fixedly arranged with a discharging funnel.

[0019] In the resource recycling system based on concentrated solar thermal pyrolysis provided by at least one embodiment of the present disclosure, further comprising a storage bin.

[0020] The storage bin is configured to communicate with the discharging funnel.

[0021] The discharging funnel is provided with a flow control valve.

[0022] In the resource recycling system based on concentrated solar thermal pyrolysis provided by at least one embodiment of the present disclosure, further comprising a waste heat recovery system.

[0023] The waste heat recovery system is used to transport the heat energy in the storage bin to the multi-stage heat absorption channel.

[0024] In the resource recycling system based on concentrated solar thermal pyrolysis provided by at least one embodiment of the present disclosure, the flow guide plate is at least partially light-transmissive.

[0025] In the resource recycling system based on concentrated solar thermal pyrolysis provided by at least one embodiment of the present disclosure, the adjusting device is an electric telescopic rod.

[0026] The two ends of the electric telescopic rod are respectively hinged to the flow guide plate and the multi-stage heat absorption channel.

[0027] The angle between the flow guide plate and the multi-stage heat absorption channel is controlled by the telescopic amount of the electric telescopic rod.

[0028] In the resource recycling system based on pyrolysis of concentrated solar energy provided by at least one embodiment of the present disclosure, the light concentrating component is a curved Fresnel transmission concentrator.

[0029] The distance between the curved Fresnel transmission concentrator and the multi-stage plate heat absorption channel is equal to the focal length of the curved Fresnel transmission concentrator.

[0030] In the resource recycling system based on pyrolysis of concentrated solar energy provided by at least one embodiment of the present disclosure, the weight ratio of the industrial waste salt and the light absorption strengthening material is 1:0.01.

[0031] The present application has the following beneficial effects:

[0032] The light concentrating component provides heat for pyrolysis of organic impurities in industrial waste salt, and the light concentrator can adjust the light concentration temperature and heat flow, so that the solar energy is clean and renewable, a large amount of energy can be saved, and carbon dioxide emission can be reduced; at the same time, the waste heat recovery system can recover and utilize the heat released by the product salt during cooling to preheat the industrial waste salt, which has obvious advantages compared with the traditional industrial waste salt treatment and disposal technology with huge energy consumption.

[0033] The light absorption strengthening material can be added to the feeding bin and mixed uniformly with the industrial waste salt, and the light absorption strengthening material can be pyrolysis product carbon or biomass material, so as to improve the light absorption performance and strengthen the heat conduction effect, realize rapid heating of the industrial waste salt particles, and effectively improve the decomposition rate of organic matter and energy utilization rate.

[0034] The inclination angle of the flow guide plate can be adjusted by the electric telescopic rod, so as to control the flow speed of the industrial waste salt. With the multi-stage plate heat absorption channel, the effective reaction time of the industrial waste salt is prolonged, so that the industrial waste salt is fully heated and decomposed therein, and efficient removal of organic pollutants is realized.

[0035] By using the product salt after high-temperature pyrolysis as a molten salt material for heat storage and utilization, and using the pyrolysis carbon material as a molten salt thermal property enhancer, the cleanliness and resource property of the product are improved, and the problems of waste disposal and low-cost development of molten salt heat storage materials are solved. BRIEF DESCRIPTION OF DRAWINGS

[0036] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort.

[0037] Fig. 1 It is a schematic diagram of the overall structure of a resource recycling system based on concentrated solar thermal pyrolysis according to the present application.

[0038] Fig. 2 It is a schematic diagram of light reflection in a multi-stage heat absorption channel.

[0039] Fig. 3 It is a curve diagram of the organic matter removal rate of industrial waste salt at different pyrolysis times obtained by the working method of the resource recycling system based on concentrated solar thermal pyrolysis according to the embodiments.

[0040] In the figure:

[0041] 10, feed bin; 11, feed inlet;

[0042] 20, multi-stage heat absorption channel; 21, guide plate; 22, waste salt flow channel; 23, light-permeable glass plate; 24, discharge hopper; 25, flow control valve; 26, baffle;

[0043] 30, light condensing component

[0044] 40, storage bin;

[0045] 50, waste heat recovery system; 51, waste heat recovery channel; 52, channel switch;

[0046] 60, adjusting device. DETAILED DESCRIPTION

[0047] The present application aims to solve the problem of large amounts of waste salt that cannot be disposed of in large quantities, overcome the shortcomings and deficiencies in existing industrial waste salt high-temperature treatment devices, and provide a resource recycling system based on concentrated solar thermal pyrolysis to achieve the heating of industrial waste salt particles with a simple structure, effectively improving the decomposition rate of organic matter and energy utilization rate; the product salt is used as a molten salt material for heat storage and utilization, and the pyrolysis carbon material is used as a molten salt thermal physical property enhancer, improving the cleanliness and resource nature of the product.

[0048] The technical solutions in the embodiments will be described clearly and completely in conjunction with the drawings in the embodiments. Obviously, the described embodiments are only some embodiments, and not all embodiments.

[0049] As Figs. 1-2As shown, a resource recycling system based on concentrated solar thermal pyrolysis includes a feeding bin 10, a multi-stage heat absorption channel 20, a plurality of light focusing components 30, a storage bin 40 and a waste heat recovery system 50.

[0050] Specifically, the feeding bin 10 is used to store industrial waste salt and reinforced light absorption material, and the storage ratio of the industrial waste salt and the reinforced light absorption material is 1:0.01.

[0051] Specifically, the multi-stage heat absorption channel 20 has a plurality of guide plates 21 inside, and the inside of the multi-stage heat absorption channel 20 is configured to form a waste salt flow channel 22 through the plurality of guide plates 21.

[0052] Specifically, the plurality of light focusing components 30 are used to provide focused light sources for the waste salt flow channel 22.

[0053] Specifically, the feeding bin 10 is configured to communicate with the multi-stage heat absorption channel 20, and the waste salt flow channel 22 is arranged in an S shape.

[0054] In this embodiment, the multi-stage heat absorption channel 20 includes a front plate (not shown), a back plate, a light-transmitting glass plate 23 and a baffle 26.

[0055] Specifically, the front plate, the back plate, the light-transmitting glass plate 23 and the baffle 26 are connected to form a closed rectangular pipeline, and the focused light sources are emitted into the inside of the channel from the light-transmitting glass plate 23.

[0056] Specifically, the light focusing component 30 is a curved surface Fresnel transmission type concentrator. The distance between the curved surface Fresnel transmission type concentrator and the light-transmitting glass plate 23 is equal to the focal length of the curved surface Fresnel transmission type concentrator.

[0057] In this embodiment, the feeding bin 10 has a feeding port 11 at the bottom, and the multi-stage heat absorption channel 20 and the feeding bin 10 communicate through the feeding port 11. The feeding bin 10 is fixedly arranged at the top end of the multi-stage heat absorption channel 20.

[0058] Further, the bottom end of the multi-stage heat absorption channel 20 is fixedly arranged with a discharging hopper 24. The storage bin 40 is configured to communicate with the discharging hopper 24.

[0059] Further, the feeding port 11 and the discharging hopper 24 are each provided with a flow control valve 25.

[0060] Further, the feeding port 11 is located above the highest guide plate 21, facilitating the material to fall onto the guide plate 21.

[0061] Exemplarily, the guide plate 21 is equipped with 4 or 5, and the curved surface Fresnel transmission type concentrator is equipped with two.

[0062] In this embodiment, the waste heat recovery system 50 is used to transfer the heat energy in the storage silo 40 to the multi-stage heat absorption channel 20.

[0063] For example, the waste heat recovery system 50 includes a waste heat recovery channel 51 and a channel switch 52. One end of the waste heat recovery channel 51 is connected to the storage silo 40, and the other end of the waste heat recovery channel 51 is connected to the multi-stage heat absorption channel 20. The channel switch 52 is mounted on the waste heat recovery channel 51 and is used to control the opening and closing of the waste heat recovery channel 51.

[0064] In this embodiment, the guide plate 21 is configured to be hinged to the multi-stage heat absorption channel 20.

[0065] An adjustment device 60 is configured between the guide plate 21 and the multi-stage heat absorption channel 20. The adjustment device 60 is used to support the guide plate 21 and can also adjust the tilt of the guide plate 21. The adjustment device 60 can adjust the guide plate 21 to a horizontal state by adjusting it, thereby achieving the interception of industrial waste salt and the enhancement of light-absorbing materials.

[0066] Furthermore, the adjusting device 60 is an electrically operated telescopic rod. Both ends of the electric telescopic rod are hinged to the guide plate 21 and the multi-stage heat absorption channel 20, respectively. The angle between the guide plate 21 and the multi-stage heat absorption channel 20 is controlled by the extension and retraction of the electric telescopic rod.

[0067] In some embodiments not shown, the waste heat recovery system also includes a fan connected to the waste heat recovery channel, which can draw hot air from the storage silo into the multi-stage heat absorption channel.

[0068] In some embodiments, the guide plate 21 is made entirely of quartz glass. Since the quartz glass guide plate is transparent, most of the focused light source incident on the quartz glass guide plate can pass through the quartz glass guide plate to heat the industrial waste salt particles. A small portion of the focused light source can be reflected by the quartz glass guide plate. Most of the heat energy of the transmitted focused light source can be absorbed by the flowing particles on the quartz glass guide plate. A small portion of the focused light source is reflected. Most of the heat energy of the reflected focused light source is absorbed by the flowing particles on the next stage of the quartz glass guide plate. A small portion of the focused light source escapes after multiple reflections.

[0069] In some embodiments, the deflector 21 is partially made of quartz glass, which allows the deflector 21 to partially transmit and reflect light.

[0070] In some embodiments, the baffle 26 has a reflective surface facing the light-transmitting glass plate 23.

[0071] To further disclose the principle of the resource recycling system based on concentrated solar pyrolysis in the embodiments, its working method will be disclosed below.

[0072] The working method of a resource recycling system based on concentrated solar pyrolysis includes the following steps:

[0073] (1) The focused light source is delivered to the waste salt channel through the curved Fresnel transmission condenser, so that the waste salt channel reaches 500 degrees Celsius;

[0074] (2) Mix industrial waste salt and enhanced light-absorbing material evenly at a weight ratio of 1:0.01 to form a mixture to be treated, and then add the mixture to be treated into the feed hopper;

[0075] (3) Adjust the guide plate to be horizontal, open the flow control valve on the feed port so that the mixture to be treated falls onto the highest guide plate, pyrolyze the mixture to be treated in the waste salt channel for a period of time, and then adjust the electric telescopic rod so that the highest guide plate tilts at 30° so that the mixture to be treated falls onto the next guide plate.

[0076] (4) The mixture to be treated is repeatedly pyrolyzed on multiple guide plates. After the mixture to be treated undergoes a full pyrolysis reaction in the multi-stage plate heat absorption channel, organic impurities generate some carbon materials, which are stored in the storage bin along with the product salt through the connecting funnel and used as industrial waste salt-based molten salt heat storage material.

[0077] By adjusting the total residence time of industrial waste salt in the heat absorption channel, the heating time of industrial waste salt particles can be controlled, thus obtaining the organic matter removal rate of industrial waste salt at different pyrolysis times. Fig. 3 As shown, the longer the pyrolysis time, the longer the industrial waste salt particles are heated, the greater the weight loss rate, and the higher the organic matter removal rate.

[0078] Although embodiments of this application have been shown and described above, the scope of protection of this invention is not limited thereto. Any variations or substitutions that can be conceived without inventive effort should be covered within the scope of protection of this invention. Unless expressly stated otherwise, no element, action or instruction used herein should be construed as critical or necessary.

Claims

1. A method for waste salt treatment based on a resource recycling system of concentrated solar thermal pyrolysis, characterized by, The method comprises the following steps: 1) delivering a focused light source into a waste salt flow channel by a curved Fresnel transmission concentrator to heat the waste salt flow channel to 500 degrees Celsius; 2) mixing industrial waste salt and light absorption enhancing material in a weight ratio of 1:0.01 to form a mixture to be treated, and then adding the mixture to be treated into a feeding bin; 3) adjusting the guide plates to be in a horizontal state, opening the flow control valve on the feeding port, and allowing the mixture to fall onto the highest guide plate, pyrolyzing the mixture in the waste salt flow channel for a period of time, and then adjusting the electric telescopic rod to tilt the highest guide plate by an angle of 30°, allowing the mixture to fall onto the next guide plate; 4) repeating the pyrolysis of the mixture on multiple guide plates, and after the mixture is sufficiently pyrolyzed in the multi-stage plate heat absorption channel, the organic impurities form part of carbon material, and the product salt enters the storage bin through the connecting hopper for storage, which is used as industrial waste salt-based molten salt heat storage material; The resource recycling system based on pyrolysis of concentrated solar heat comprises: a feeding bin for storing industrial waste salt and light absorption enhancing material; a multi-stage heat absorption channel having multiple guide plates, the multi-stage heat absorption channel being configured to form a waste salt flow channel through the multiple guide plates; multiple light concentrating components for providing a focused light source for the waste salt flow channel; a storage bin; and a waste heat recovery system for delivering heat energy in the storage bin to the multi-stage heat absorption channel; wherein the feeding bin is configured to communicate with the multi-stage heat absorption channel; wherein the multi-stage heat absorption channel has at least one light transmission site for the focused light source to enter the waste salt flow channel; wherein the guide plates and / or the multi-stage heat absorption channel have at least one reflection part for reflecting the light source in the waste salt flow channel; wherein the guide plates are hingedly connected to the multi-stage heat absorption channel, and an adjusting device is arranged between the guide plates and the multi-stage heat absorption channel, the adjusting device being used to adjust the inclination of the guide plates; wherein the bottom end of the multi-stage heat absorption channel is fixedly configured with a discharge hopper, and the storage bin is configured to communicate with the discharge hopper; wherein the discharge hopper is provided with a flow control valve.

2. The waste salt treatment method of the resource recycling system based on the concentrated solar thermal pyrolysis according to claim 1, characterized in that, The waste salt flow channel is arranged in an S shape.

3. The method of claim 1, wherein the method is characterized by: The feeding bin has a feeding port at the bottom, and the multi-stage heat absorption channel and the feeding bin communicate through the feeding port; The feeding bin is fixedly arranged at the top end of the multi-stage heat absorption channel.

4. The method of claim 1, wherein the method is a method of waste salt treatment in a resource recycling system based on concentrating solar thermal pyrolysis. The guide plates are at least partially transparent to light.

5. The method of claim 1, wherein the method is a method of waste salt treatment in a resource recycling system based on concentrating solar thermal pyrolysis. The adjusting device is an electric telescopic rod; The two ends of the electric telescopic rod are hingedly connected to the guide plates and the multi-stage heat absorption channel, respectively; The angle between the guide plates and the multi-stage heat absorption channel is controlled by the extension amount of the electric telescopic rod.

6. The method of claim 1, wherein the method is a method of waste salt treatment in a resource recycling system based on concentrating solar thermal pyrolysis. The light concentrating components are curved Fresnel transmission concentrators; The distance between the curved Fresnel transmission concentrator and the multi-stage plate heat absorption channel is equal to the focal length of the curved Fresnel transmission concentrator.

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