Supercritical hydrothermal flameless combustion heat release device and heat and electricity green alcohol co-production water purification system

Abstract

This invention provides a supercritical hydrothermal flameless combustion heat release device and a cogeneration system for producing green alcohol and water purification, including an outer shell, an inner shell, and an inner pipe; the cogeneration system includes a saturated oxygen water purification tank, a wastewater tank, a regeneration tank, a methanol reactor, and a generator set; this device utilizes the superoxidation capacity of medium-deep wells after they become supercritical water containers to oxidize and burn organic hydrocarbons, generating heat while simultaneously decomposing and rendering harmless organic pollutants in the water; this device is not only suitable for the comprehensive energy development and utilization of medium-deep geothermal or oil well bottoms, but can also be used for the treatment of wastewater containing mixed organic or inorganic pollutants, protecting the environment, recycling energy, and contributing to the achievement of carbon neutrality goals.

Description

Technical Field

[0001] This invention relates to the field of environmental protection and energy devices, specifically to a supercritical hydrothermal flameless combustion heat release device and a cogeneration system for producing green alcohol and water purification. Background Technology

[0002] Supercritical hydrothermal flameless combustion technology is used when water pressure is above 23MPa and temperature is above 425℃, it enters a supercritical state. If oxygen is added, the internal properties at this time can oxidize any organic matter contained in the raw water, turning it into inorganic particles, generating N2, H2, and CO2 gases, and releasing the heat of reaction.

[0003] Deep underground well space generally refers to the underground space drilled at depths of two to three thousand meters. This includes oil wells and geothermal wells used for underground oil extraction and geothermal water extraction, as well as exploration wells used for exploring oil and geothermal resources. With the increasing exploitation of oil resources, many oil wells are entering the later stages of their life cycle and are about to be abandoned. Furthermore, with the exploitation of geothermal wells and the drilling of deep geothermal layers, there are also a large number of abandoned wells that produce heat but no water. The underground space formed by these abandoned wells is often left idle and wasted. Therefore, from the perspective of resource recycling and energy conservation, utilizing abandoned oil wells and geothermal wells for supercritical hydrothermal flameless combustion energy supply is beneficial.

[0004] In addition, in the food and pharmaceutical processing and manufacturing industry, a large amount of wastewater rich in organic matter is discharged during the production process. The water treatment cost is often relatively high. If supercritical hydrothermal flameless combustion can be used to harmlessly treat the organic matter in the wastewater, it is also a feasible water treatment approach. However, the requirements for the equipment to be resistant to temperature, pressure, and corrosion, as well as to prevent scaling, are relatively high.

[0005] Therefore, providing a hydrothermal flameless combustion device that utilizes abandoned wells for hydrothermal flameless combustion and can prevent scaling has become an urgent problem to be solved. Summary of the Invention

[0006] To address the aforementioned problems, this invention provides a supercritical hydrothermal flameless combustion heat release device, comprising an outer shell, an inner shell, and an inner tube; the outer shell, inner shell, and inner tube are coaxially sleeved, and from the inside out are the inner tube, inner shell, and outer shell, with a cavity one formed between the outer shell and the inner shell, and a cavity two formed between the inner shell and the inner tube;

[0007] The outer shell is provided with a liquid inlet 1, which is connected to cavity 1 and the outside. The inner shell is provided with a liquid inlet 2, which is connected to cavity 2 and the outside. The inner shell is also provided with several through holes. Cavity 2 is connected to cavity 1 through the through holes. The inlet of the inner tube is connected to cavity 2, and the outlet is connected to the outside.

[0008] Preferably, the second cavity is further provided with a heating device. Most preferably, the heating device is an electric heater, including a positive electrode and a negative electrode of an arc-shaped electrode plate, which are respectively disposed in the second cavity.

[0009] Preferably, the inner shell is made of porous zirconium ceramic material.

[0010] Preferably, the inner tube is a graphite-zirconium ceramic composite material.

[0011] Preferably, the outer shell has a U-shaped structure.

[0012] Preferably, the inner shell has a U-shaped structure.

[0013] Preferably, the distance between the outer shell and the inner shell is 20-50 mm.

[0014] Preferably, the distance between the inner shell and the inner tube is 20-50 mm.

[0015] Preferably, the inner diameter of the inner tube is 50-100 mm.

[0016] The present invention also provides a thermoelectric green alcohol cogeneration water purification system based on a supercritical hydrothermal flameless combustion heat release device, specifically including a saturated oxygen water purification tank, a wastewater tank, a regeneration tank, a methanol reactor, and a generator set;

[0017] The saturated oxygen water purification tank is connected to the outside and liquid inlet one, respectively. The sewage tank is connected to the outside and liquid inlet two, respectively. The inner pipe outlet is connected to the regeneration tank. The regeneration tank is also provided with a gas outlet, a liquid outlet and a sewage outlet. The gas outlet is connected to the methanol reactor. The liquid outlet and sewage outlet are connected to the outside through pipelines. On the liquid outlet pipeline, a heat exchange plate one is provided according to the liquid flow direction. The generator set is connected to the heat exchange plate one.

[0018] Preferably, a second heat exchange plate is provided on the liquid outlet pipeline according to the liquid flow direction, and the heating equipment is connected to the second heat exchange plate.

[0019] The present invention has the following advantages:

[0020] (1) The laminar flow generated by this device can prevent scaling, thereby enabling continuous supercritical hydrothermal flameless combustion.

[0021] (2) This invention utilizes the superoxidizing capacity of a medium-deep well after it becomes a supercritical water container to oxidize and burn organic hydrocarbons, generating heat while simultaneously decomposing and rendering harmless the organic pollutants in the water. The organic pollutants in the water are oxidized and decomposed into carbon and hydrogen molecules, rendering them harmless. When the wastewater is rich in hydrocarbons, flameless combustion is achieved through electric heating from the wellhead along the pipe wall to the bottom of the well. The wastewater temperature rises and returns through another channel to the heat exchange device at the wellhead, completing the conversion and release of heat energy, purifying and filtering the water, and introducing it into a greywater reuse system.

[0022] (3) This device is not only suitable for the comprehensive development and utilization of medium-deep geothermal or oil well bottom energy, but can also be used for the treatment of wastewater containing mixed pollutants of organic or inorganic matter, recycling energy and protecting the environment.

[0023] (4) This device can be placed at the bottom of medium-deep wells to transform abandoned wells into energy wells that can generate heat and electricity, or it can be placed in organic wastewater treatment process systems for wastewater treatment.

[0024] (5) This system can realize water treatment for sewage purification, production of associated green methanol, and cascade utilization of flameless combustion power generation and heating. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0026] Figure 1 This is a cross-sectional view of the device;

[0027] Figure 2 This is a top view of the device;

[0028] Figure 3 This is a process flow diagram of a combined heat and power plant for producing green alcohol and then purifying water. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] Example 1

[0031] Combined with appendix Figure 1-2This embodiment provides a supercritical hydrothermal flameless combustion heat release device, including an outer shell 1, an inner shell 2, and an inner tube 3. Both the outer shell 1 and the inner shell 2 are U-shaped structures. The outer shell 1, the inner shell 2, and the inner tube 3 are coaxially sleeved, arranged from the inside out as the inner tube 3, the inner shell 2, and the outer shell 1. A cavity 101 is formed between the outer shell 1 and the inner shell 2. The distance between the outer shell 1 and the inner shell 2 is m1 = 50 mm, and the distance between the bottom of the outer shell 1 and the bottom of the inner shell 2 is h1 = 60 mm. A cavity 102 is formed between the inner shell 2 and the inner tube 3. The distance between the inner shell 2 and the inner tube 3 is m2 = 30 mm, and the distance between the inlet of the inner tube 3 and the bottom of the inner shell 2 is h2 = 50 mm.

[0032] The outer shell 1 is provided with a liquid inlet 11, which is connected to the cavity 101 and the outside. The inner shell 2 is provided with a liquid inlet 12, which is connected to the cavity 102 and the outside. The bottom of the inner shell 2 is also provided with several through holes 6. The cavity 102 is connected to the cavity 101 through the through holes 6. The inlet of the inner tube 3 is connected to the cavity 102, and the outlet is connected to the outside.

[0033] The cavity 2 102 is also provided with a positive electrode 4 and a negative electrode 5 of the arc-shaped electrode plate of the electric heater.

[0034] The outer shell 1 is made of conventional pressure- and temperature-resistant materials, such as heat-resistant steel; the inner shell 2 is made of porous zirconium ceramic material; and the inner tube 3 is made of graphite-zirconium ceramic composite material.

[0035] The operating conditions of this device are: temperature 50-500℃, pressure range 50-300MPa, and the power supply for the electric heater is DC36V with a power of 20-30kW. Fluid A is saturated oxygen-purified water, fluid B is an aqueous suspension containing organic particles, and fluid C contains CO2, N2, H2, and carbonate particles.

[0036] The working principle of this device is as follows: Fluid A, after ultrafiltration or nanofiltration, enters cavity 101 through inlet-11 on the outer shell 1, and flows through section h4 and section h3 in sequence according to the direction of the arrow. h4 is the heat exchange section and h3 is the flameless combustion section of electrical energy permeation mixing oxidation.

[0037] The fluid B to be processed enters the cavity 102 from the inlet 12 on the inner shell 2. When it flows through the h4 section in the direction of the arrow, it undergoes heat exchange and is heated to 400-450℃. At this time, the water is in a supercritical state. When it enters a dynamic self-heating equilibrium state, the heating stops.

[0038] Within section h3, due to the greater pressure of fluid A than that of fluid B, the inner shell 2 of cavity 101 forms a uniform thin layer in section h3 (to prevent scaling). Then, fluid A enters cavity 202 through through hole 6 and mixes with fluid B to enter the plasma state working state, generating heat, CO2, H2, and carbonate particles.

[0039] The fluid C formed by the plasma reaction enters from the inlet of the inner tube 3 and flows upward in the direction of the arrow. It undergoes heat exchange when passing through the h4 section. When the organic matter and oxygen content in the fluid B are suitable, the heat generation and heat exchange process reaches dynamic equilibrium.

[0040] When the device is initially started from a cold state, the heating device can be activated to heat the electrolyzed water. Electrolysis produces O2 and H2. After the static temperature rises to above 40°C, the device can begin dynamic operation. Furthermore, there is no cold start issue in medium-deep geothermal wells.

[0041] Combined with appendix Figure 3 This embodiment also provides a combined heat and power chlorophyll production water purification system, including a saturated oxygen water purification tank F, a wastewater tank H, a regeneration tank G, a methanol reactor I, and a generator set J;

[0042] The saturated oxygen water purification tank F has its inlet and outlet connected to the outside and liquid inlet 11, respectively. The sewage tank H has its inlet and outlet connected to the outside and liquid inlet 12, respectively. The inner pipe 3 has its outlet connected to the regeneration tank G. The regeneration tank G is also equipped with a gas outlet, a liquid outlet and a sewage outlet. The gas outlet is connected to the methanol reactor I. The liquid outlet and sewage outlet are connected to the outside through pipelines. On the liquid outlet pipeline, heat exchange plate K and heat exchange plate L are arranged in sequence according to the liquid flow direction. The generator set J is connected to heat exchange plate K.

[0043] The operating principle of this system is as follows: Fluid A in the saturated oxygen water purification tank F is transferred to inlet 11 by a transfer pump, fluid B in the sewage tank H is transferred to inlet 12 by a transfer pump, and fluid C flowing out of the inner pipe 3 is transferred to the regeneration tank G by a transfer pump. Fluid C undergoes solid-liquid-gas three-phase separation in the regeneration tank G. Carbonate precipitate G3 flows out from the drain outlet, gas G1 is discharged from the gas outlet and enters the methanol reactor I. The resulting water G2 after separation is discharged from the liquid outlet.

[0044] Gas G1 contains CO2, N2, and H2. After N2 is separated, it undergoes a catalytic reduction reaction in methanol reactor I to produce methanol I1. The reaction formula is as follows: CO2 + 3H2 = CH3OH + H2O.

[0045] When the greywater G2 flows through heat exchange plate K, it undergoes heat exchange, cooling from 400-450℃ to 80℃. Generator set J uses this heat to generate electricity. When the greywater G2 flows through heat exchange plate L, it undergoes secondary heat exchange, cooling from 80℃ to 60℃. Heating equipment M uses this heat to heat other facilities (such as residential buildings and agricultural facilities). Finally, the low-temperature greywater G2 that flows out can be reused in the greywater system, realizing the water treatment from sewage to greywater.

[0046] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A supercritical hydrothermal flameless combustion heat release device, characterized in that, It includes an outer shell, an inner shell, and an inner tube; the outer shell, inner shell, and inner tube are coaxially sleeved, and from the inside out are the inner tube, inner shell, and outer shell, respectively. A cavity one is formed between the outer shell and the inner shell, and a cavity two is formed between the inner shell and the inner tube; the fluid pressure in cavity one is greater than the fluid pressure in cavity two. The outer shell is provided with a liquid inlet 1, which is connected to cavity 1 and the outside. The inner shell is provided with a liquid inlet 2, which is connected to cavity 2 and the outside. The inner shell is also provided with several through holes. Cavity 2 is connected to cavity 1 through the through holes. The inlet of the inner tube is connected to cavity 2, and the outlet is connected to the outside.

2. The supercritical hydrothermal flameless combustion heat release device according to claim 1, characterized in that, The second cavity is also equipped with a heating device.

3. The supercritical hydrothermal flameless combustion heat release device according to claim 2, characterized in that, The heating device is an electric heater, comprising a positive arc-shaped electrode plate and a negative arc-shaped electrode plate, wherein the positive arc-shaped electrode plate and the negative arc-shaped electrode plate are respectively disposed in cavity two.

4. The supercritical hydrothermal flameless combustion heat release device according to claim 1, characterized in that, The inner shell is made of porous zirconium ceramic material, and the inner tube is made of graphite-zirconium ceramic composite material.

5. The supercritical hydrothermal flameless combustion heat release device according to claim 1, characterized in that, The outer shell has a U-shaped structure, and the inner shell has a U-shaped structure.

6. The supercritical hydrothermal flameless combustion heat release device according to claim 1, characterized in that, The distance between the outer shell and the inner shell is 20-50mm.

7. The supercritical hydrothermal flameless combustion heat release device according to claim 1, characterized in that, The distance between the inner shell and the inner tube is 20-50mm.

8. The supercritical hydrothermal flameless combustion heat release device according to claim 1, characterized in that, The inner diameter of the inner tube is 50-100mm.

9. A thermoelectric chlorophyll co-production water purification system based on the apparatus of any one of claims 1-8, characterized in that, It includes a saturated oxygen water purification tank, a wastewater tank, a regeneration tank, a methanol reactor, and a generator set; The saturated oxygen water purification tank is connected to the outside and liquid inlet one, respectively. The sewage tank is connected to the outside and liquid inlet two, respectively. The inner pipe outlet is connected to the regeneration tank. The regeneration tank is also provided with a gas outlet, a liquid outlet and a sewage outlet. The gas outlet is connected to the methanol reactor. The liquid outlet and sewage outlet are connected to the outside through pipelines. On the liquid outlet pipeline, a heat exchange plate one is provided according to the liquid flow direction. The generator set is connected to the heat exchange plate one.

10. The cogeneration and purification system for chlorophyll as described in claim 9, characterized in that, On the liquid outlet pipeline, a second heat exchange plate is also installed according to the liquid flow direction, and the heating equipment is connected to the second heat exchange plate.

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