CO2 recovery and cyclic utilization device

Abstract

The utility model discloses a CO2 recovery and cyclic utilization device which comprises a gypsum reaction tank and a decalcification reaction tank, a main pipeline is arranged between the gypsum reaction tank and the decalcification reaction tank in a communicated mode, and a cyclone type water-gas separator, a variable frequency air pump, a CO2 concentration sensor and a CO2 flow sensor are sequentially arranged on the main pipeline in series in the airflow circulation direction. The main pipeline is connected with a CO2 storage station through a gas storage pipeline and a gas release pipeline, the gas storage pipeline and the gas release pipeline are located at the upstream of the variable-frequency gas pump, and a water drainage pipeline is arranged between the water drainage end of the cyclone type water-gas separator and the decalcification reaction tank in a communicating mode; according to the CO2 recovery and cyclic utilization device disclosed by the utility model, the main pipeline is communicated between the gypsum reaction tank and the decalcification reaction tank, and CO2 gas generated by reaction in the gypsum reaction tank is guided into the decalcification reaction tank; cO2 can be recovered and quantitatively supplied for limited cyclic utilization.

Description

Technical Field

[0001] The utility model relates to a CO2 recovery and recycling device, belonging to the technical field of energy utilization. Background Art

[0002] The high content of calcium and magnesium ions in the recycled water from copper smelting industrial wastewater will lead to scaling and blockage of recycled water pipes and equipment at the recycling point, fluctuations in process indicators, and reduced product quality. In order to reduce the hardness of recycled water, ion exchange and chemical precipitation methods are usually used. The ion exchange method is to exchange the calcium and magnesium ions in the water with ion exchange resins to replace the hardness ions, thereby reducing the hardness of the water. The chemical precipitation method is to add chemical reagents to the water to form precipitation and remove hardness ions such as calcium and magnesium. The "CO2+NaOH" decalcification and softening process is widely used in the field of water treatment due to its advantages such as high efficiency, rapidity, energy saving and environmental protection, easy operation, and wide applicability.

[0003] At present, most of the enterprises that adopt the "CO2+NaOH" decalcification and softening process mainly purchase liquid carbon dioxide solution, which is vaporized into carbon dioxide gas by a vaporizer and then passed into the decalcification reaction tank. After the heavy metal ions are removed by sulfidation, the waste acid produced in the copper smelting flue gas acid purification process is often reacted with calcium carbonate to further reduce the acidity. In the original production model, the carbon dioxide generated by the reaction is directly discharged, resulting in a waste of CO2 gas resources. If this part of the gas is used, the carbon dioxide emissions can be reduced.

[0004] Therefore, there is an urgent need to design a device that can collect, transfer and limitedly recycle CO2 gas. Utility Model Content

[0005] In order to solve the above problems existing in the prior art, the utility model provides a CO2 recovery and recycling device.

[0006] The technical solution of the utility model is as follows:

[0007] A CO2 recovery and recycling device, comprising a gypsum reaction tank and a decalcification reaction tank, wherein a main pipeline is provided between the gypsum reaction tank and the decalcification reaction tank, a cyclone water-gas separator, a variable frequency air pump, a CO2 concentration sensor and a CO2 flow sensor are provided in series in sequence along the airflow direction on the main pipeline, a CO2 storage station is provided on the main pipeline through an air storage pipeline and an air release pipeline, the air storage pipeline and the air release pipeline are located upstream of the variable frequency air pump, and a drainage pipeline is provided between the drainage end of the cyclone water-gas separator and the decalcification reaction tank;

[0008] The CO2 recovery and recycling device also includes a frequency conversion control processor, the CO2 concentration sensor and the CO2 flow sensor are electrically connected to the frequency conversion control processor for transmitting sensor detection signals, and the frequency conversion air pump is electrically connected to the frequency conversion control processor for receiving frequency conversion working signals.

[0009] As a preferred solution, an inlet valve and an outlet valve are respectively provided on the main pipeline upstream and downstream of the variable frequency air pump.

[0010] As a preferred solution, the gas storage pipeline and the gas release pipeline are respectively provided with a gas storage valve and a gas exhaust valve.

[0011] As a preferred embodiment, the cyclone water vapor separator includes a shell, a guide pipe is fixedly arranged in the middle of the inner cavity of the shell, the guide pipe is open at the bottom, closed at the top and fixed to the top of the inner cavity of the shell, a spiral guide plate is fixedly arranged on the outer wall of the guide pipe, and a gap is provided between the outer periphery of the spiral guide plate and the inner wall of the shell, a liquid collecting tank is arranged at the bottom of the shell, and the cyclone water vapor separator also includes an air inlet pipe and an exhaust pipe, the air inlet pipe is connected to the upper end of the side wall of the shell, and the exhaust pipe passes through the side wall of the shell and is connected to the upper end of the guide pipe.

[0012] As a preferred embodiment, a bushing is circumferentially attached to the inner wall surface of the shell, and the inner surface of the bushing has densely arranged buffer protrusions. The buffer protrusions are conical structures with small tips and large roots, and arc grooves are formed between adjacent buffer protrusions.

[0013] Beneficial Effects

[0014] The CO2 recovery and recycling device of the utility model is provided with a main pipeline connecting the gypsum reaction tank and the decalcification reaction tank, and the CO2 gas generated by the reaction in the gypsum reaction tank is introduced into the decalcification reaction tank; and a variable frequency air pump, a CO2 concentration sensor and a CO2 flow sensor are arranged on the main pipeline, and cooperate with an external variable frequency control processor to realize CO2 recovery and quantitative supply for limited recycling.

[0015] The CO2 recovery and recycling device of the utility model is provided with a CO2 storage station on the main pipeline. When the supply of CO2 gas generated by the gypsum reaction tank exceeds the demand, the gas can be temporarily stored in the CO2 storage station. When the demand for CO2 gas exceeds the supply, the CO2 storage station supplements the supply to the decalcification reaction tank to ensure that the CO2 gas can be supplied continuously and stably.

[0016] The cyclone water vapor separator adopted by the CO2 recovery and recycling device of the utility model has a gap between its inner wall and the internal spiral guide plate, and a bushing is arranged against the wall in the gap, and the anti-sputtering weakening effect played by the densely distributed buffer protrusions and arc-shaped grooves on the inner surface of the bushing is utilized, so that the moisture separated from the airflow can be better adhered to the inner surface of the bushing, thereby improving the drying effect of the equipment on the CO2 gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the overall connection structure of the utility model;

[0018] Figure 2 This is a schematic diagram of the electrical connection structure of the frequency conversion control processor of the utility model;

[0019] Figure 3 This is a schematic diagram of the structure of the cyclone type water-gas separator of the utility model;

[0020] Figure 4 The utility model is a schematic diagram of the inner surface structure of the liner of the cyclone type water-gas separator. DETAILED DESCRIPTION

[0021] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0022] Example 1

[0023] See also Figure 1-2 A CO2 recovery and recycling device includes a gypsum reaction tank 10 and a decalcification reaction tank 20. The reaction in the gypsum reaction tank 10 is specifically that the waste acid produced in the copper smelting flue gas acid purification process is sulfided to remove heavy metal ions, and calcium carbonate is often used to react with it to further reduce the acidity. In this reaction process, CO2 gas can be generated in the gypsum reaction tank 10; the reaction in the decalcification reaction tank 20 is specifically a "CO2+NaOH" decalcification and softening process, in which hardness ions such as calcium and magnesium are combined with carbonate ions in an aqueous solution to form a precipitate and removed, thereby improving the scaling and blockage problem of recycled water pipelines and recycling point equipment in the copper smelting industry.

[0024] In the novel device, a main pipeline 30 is provided between the gypsum reaction tank 10 and the decalcification reaction tank 20, and the main pipeline 30 is mainly used to pass the CO2 gas generated in the gypsum reaction tank 10 into the decalcification reaction tank 20;

[0025] The main pipeline 30 is provided with a cyclone water-gas separator 40, a variable frequency air pump 50, a CO2 concentration sensor 60 and a CO2 flow sensor 70 in series in the direction of air flow. The main pipeline 30 is provided with an inlet valve 31 and an outlet valve 32 at the upstream and downstream of the variable frequency air pump 50, respectively.

[0026] Among them, the CO2 recovery and recycling device also includes a frequency conversion control processor 110, the CO2 concentration sensor 60 and the CO2 flow sensor 70 are electrically connected to the frequency conversion control processor 110 for transmitting sensor detection signals, and the frequency conversion air pump 50 is electrically connected to the frequency conversion control processor 110 for receiving frequency conversion working signals; during actual operation, the frequency conversion control processor 110 presets a set value according to the total amount of CO2 required for the reaction of the decalcification reaction tank 20, and the frequency conversion control processor 110 converts the total amount of CO2 according to the CO2 concentration and flow rate monitored in real time by the CO2 concentration sensor 60 and the CO2 flow sensor 70. When the total amount of CO2 is lower than the set value, the frequency of the frequency conversion air pump 50 is increased, and when the total amount of CO2 is higher than the set value, the frequency of the frequency conversion air pump 50 is reduced; thereby ensuring the quantitative supply of CO2 gas.

[0027] Since the working frequency and time period of the gypsum reaction tank 10 and the decalcification reaction tank 20 cannot be synchronized, in order to ensure that the CO2 gas can be continuously and stably supplied; in this embodiment, a CO2 storage station 90 is provided on the main pipeline 30 through a gas storage pipeline 83 and a gas release pipeline 84, and the gas storage pipeline 83 and the gas release pipeline 84 are located upstream of the variable frequency air pump 50, and the gas storage pipeline 83 and the gas release pipeline 84 are respectively provided with a gas storage valve 81 and an exhaust valve 82; in actual operation, when the gypsum reaction tank 10 generates When the supply of CO2 gas exceeds the demand, the gas storage valve 81 is opened and the exhaust valve 82 is closed, and the CO2 gas can be temporarily stored in the CO2 storage station 90; when the demand for CO2 gas is greater than the supply, the gas storage valve 81 is closed and the exhaust valve 82 is opened, and the CO2 storage station 90 replenishes the supply to the decalcification reaction tank 20; further, in addition to the container for storing CO2, the CO2 storage station 90 can also be equipped with corresponding compression equipment and pipeline auxiliary control valves and other facilities, so as to improve the storage efficiency and the degree of automation of pipeline control.

[0028] The cyclone water-gas separator 40 mainly plays the role of drying CO2 gas. A drainage pipeline 100 is provided between the drainage end of the cyclone water-gas separator 40 and the decalcification reaction tank 20. When the collected water reaches a certain amount, the drainage valve of the cyclone water-gas separator 40 can be opened and discharged to the decalcification reaction tank 20.

[0029] Example 2

[0030] See also Figure 3-4, based on the cyclone water vapor separator 40 of Example 1; specifically, the cyclone water vapor separator 40 includes a shell 41, a guide pipe 42 is fixedly arranged in the middle of the inner cavity of the shell 41, the guide pipe 42 is open at the bottom, closed at the top and fixed to the top of the inner cavity of the shell 41, a spiral guide plate 43 is fixedly arranged on the outer wall of the guide pipe 42, and a gap is provided between the outer periphery of the spiral guide plate 43 and the inner wall of the shell 41, a liquid collecting tank 44 is arranged at the bottom of the shell 41, the liquid collecting tank 44 is connected to the drainage pipeline 100 and a drainage valve is arranged, the cyclone water vapor separator 40 also includes an air inlet pipe 45 and an exhaust pipe 46, the air inlet pipe 45 is connected to the upper end of the side wall of the shell 41, and the exhaust pipe 46 passes through the side wall of the shell 41 and is connected to the upper end of the guide pipe 42; the conventional drying working principle of the cyclone water vapor separator 40 is the existing technology, and this embodiment will not repeat it;

[0031] In the present embodiment, since the CO2 gas discharged from the gypsum reaction tank 10 carries a lot of water vapor, the conventional cyclone water vapor separator 40 has a general drying effect in actual application. The reasons include that the cyclone water vapor separator 40 works on the principle of centrifugal dehydration. In the shell 41 of the cyclone water vapor separator 40, the water mist separated from the airflow by the centrifugal force is thrown out at high speed and directly splashed on the smooth inner wall of the shell 41. Part of the water mist will produce a back-sputtering phenomenon and return to the airflow, thereby failing to achieve a more ideal drying effect. For this reason, in the present embodiment, a bushing 47 is circumferentially attached to the inner wall surface of the shell 41, and the inner surface of the bushing 47 has densely arranged buffer protrusions 471, such as Figure 4 As shown, the buffer protrusion block 471 is a conical structure with a small tip and a large root, and an arc-shaped groove 472 is formed between adjacent buffer protrusion blocks 471. Since the surfaces of the buffer protrusion block 471 and the arc-shaped groove 472 are inclined surfaces with a larger angle, after the water mist splashes on the inclined surface, the reflection angle almost still falls on the surface of the adjacent buffer protrusion block 471, thereby preventing some fine water mist from being vertically splashed back on the inner wall of the shell 41 and then being entrained and absorbed by the airflow, thereby achieving the weakening of the water mist splashing back and improving the drying effect of the cyclone water vapor separator 40.

[0032] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A CO 2 Recovery and recycling equipment, Features: The invention comprises a gypsum reaction tank (10) and a decalcification reaction tank (20), wherein a main pipeline (30) is arranged between the gypsum reaction tank (10) and the decalcification reaction tank (20), and a cyclone-type water-gas separator (40), a variable frequency air pump (50), a CO 2 Concentration sensor (60) and CO 2 The main pipeline (30) is connected to a CO flow sensor (70) via a gas storage pipeline (83) and a gas release pipeline (84). 2 The storage station (90), the gas storage pipeline (83) and the gas release pipeline (84) are located upstream of the variable frequency air pump (50), and a drainage pipeline (100) is provided between the drainage end of the cyclone water-gas separator (40) and the decalcification reaction tank (20); The CO 2 The recovery and recycling device also includes a frequency conversion control processor (110), the CO 2 Concentration sensor (60) and CO 2 The flow sensor (70) is electrically connected to the variable frequency control processor (110) for transmitting a sensing detection signal, and the variable frequency air pump (50) is electrically connected to the variable frequency control processor (110) for receiving a variable frequency working signal.

2. A CO as claimed in claim 1 2 Recovery and recycling equipment, Features: An inlet valve (31) and an outlet valve (32) are respectively arranged on the main pipeline (30) upstream and downstream of the variable frequency air pump (50).

3. A CO as claimed in claim 1 2 Recovery and recycling equipment, Features: The gas storage pipeline (83) and the gas release pipeline (84) are respectively provided with a gas storage valve (81) and a gas exhaust valve (82).

4. A CO as claimed in claim 1 2 Recovery and recycling equipment, Features: The cyclone-type water-gas separator (40) comprises a shell (41), a guide pipe (42) is fixedly arranged in the middle of the inner cavity of the shell (41), the guide pipe (42) is open at the bottom and closed at the top and is fixed to the top of the inner cavity of the shell (41), a spiral guide plate (43) is fixedly arranged on the outer wall of the guide pipe (42), a gap is provided between the outer periphery of the spiral guide plate (43) and the inner wall of the shell (41), a liquid collecting tank (44) is arranged at the bottom of the shell (41), and the cyclone-type water-gas separator (40) further comprises an air inlet pipe (45) and an air outlet pipe (46), the air inlet pipe (45) is connected to the upper end of the side wall of the shell (41), and the air outlet pipe (46) passes through the side wall of the shell (41) and is connected to the upper end of the guide pipe (42).

5. A CO as claimed in claim 4 2 Recovery and recycling equipment, Features: A bushing (47) is circumferentially attached to the inner wall surface of the shell (41), and the inner surface of the bushing (47) has densely arranged buffering protrusions (471). The buffering protrusions (471) are conical structures with a small tip and a large root, and arc-shaped grooves (472) are formed between adjacent buffering protrusions (471).

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