Low-pressure carbon dioxide grey water hardness removal device

Abstract

The utility model discloses a low-pressure carbon dioxide grey water hardness removal device in the technical field of chemical engineering. The low-pressure carbon dioxide grey water hardness removal device comprises a PH regulating tank, a reaction tank arranged at one end of the PH regulating tank, a coagulation tank arranged at one end, far away from the PH regulating tank, of the reaction tank, a flocculation tank arranged at one end, far away from the reaction tank, of the coagulation tank, and a sedimentation tank arranged at one end, far away from the coagulation tank, of the flocculation tank. A pipeline is laid to introduce low-pressure carbon dioxide into the grey water hardness removal device. A pore distributor is manufactured to dissolve carbon dioxide gas in grey water, the gas carbon dioxide is dissolved in the grey water under a certain condition to generate carbonate ions, the main hardness of the grey water is calcium and magnesium ions, the carbonate ions are combined with the calcium and magnesium ions in the grey water to generate calcium carbonate and magnesium carbonate precipitates, and the hardness of the grey water is reduced. The low-pressure gas carbon dioxide is used as an agent for ash water hardness removal, the usage amount of 7 tons of sodium carbonate agent can be reduced every day, the operation cost of the device is saved, the emission amount of carbon dioxide waste gas is reduced, carbon emission is reduced, and environment protection is facilitated.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of chemical industry, concretely is low pressure carbon dioxide hard water removing device. BACKGROUND

[0002] China is a poor oil, less gas, rich coal country, coal in primary energy production and consumption structure has been more than 70%, it is estimated that in the next half century, coal will still be the main primary energy.

[0003] Coal chemical industry is with coal as raw material through chemical processing, realizes the transformation of coal and comprehensive utilization industry.

[0004] The core of coal chemical industry is coal gasification, with the development of coal gasification technology, efficient and clean utilization of coal becomes the first choice of chemical industry.

[0005] Coal gasification water consumption is large, basically consumes 1.0 tons and uses about 3.0 tons of water.

[0006] In order to stabilize the quality of grey water, grey water hardness removal is a good choice for coal chemical enterprises. Utility model content

[0007] The utility model discloses a low pressure carbon dioxide ash water hardness removal device to solve the problems in the above background technology.

[0008] In order to realize the above object, the utility model provides the following technical scheme: low pressure carbon dioxide ash water hardness removal device, including PH adjusting pool, the one end of PH adjusting pool is provided with the reaction pool, the one end of reaction pool is provided with coagulation tank away from PH adjusting pool, the one end of coagulation tank is provided with flocculation tank away from reaction pool, the one end of flocculation tank is provided with sedimentation tank away from coagulation tank, the one end of sedimentation tank is provided with PH counter -adjusting pool away from flocculation tank, the one end of PH counter -adjusting pool is provided with water production tank away from sedimentation tank, the one end of mutual approach of PH adjusting pool, reaction pool, coagulation tank, flocculation tank, sedimentation tank, PH counter -adjusting pool and water production tank is all common through fixed connection with the connecting pipe of connection.

[0009] As a further scheme of the utility model: the one end of sedimentation tank is provided with suction dredge pump, and the output end of suction dredge pump is provided to the one end of sedimentation tank.

[0010] As a further scheme of the utility model: the output end of suction dredge pump is fixedly connected with suction dredge pipe, and the one end of suction dredge pipe is fixedly connected with the bottom end of sedimentation tank.

[0011] As a further scheme of the utility model: the top end lateral wall of one side of PH adjusting pool is fixedly connected with the first dosing pipe through, and the top end lateral wall of one side of reaction pool is fixedly connected with the second dosing pipe through.

[0012] As a further scheme of the utility model: the top end lateral wall of one side of coagulation tank is fixedly connected with the third dosing pipe through, and the top end lateral wall of one side of flocculation tank is fixedly connected with the fourth dosing pipe through.

[0013] As a further scheme of the utility model: the top end lateral wall of one side of PH counter -adjusting pool is fixedly connected with the fifth dosing pipe through.

[0014] Compared with the prior art, the utility model has the beneficial effects that:

[0015] 1, ash water hardness removal device needs to use sodium carbonate medicament to reduce ash water hardness, and the average daily use amount of sodium carbonate is about 7 tons.

[0016] 2, lay pipeline and introduce low pressure carbon dioxide into ash water hardness removal device. Make fine hole distributor to dissolve carbon dioxide gas in ash water, and carbon dioxide gas is dissolved in ash water under certain conditions to generate carbonate ions. The main hardness in ash water is calcium and magnesium ions. Carbonate ions combine with calcium ions and magnesium ions in ash water to generate calcium carbonate and magnesium carbonate precipitate, thereby reducing the hardness of ash water.

[0017] 3. The low-pressure gas carbon dioxide is used as the medicament for the hardening of the grey water, and the use amount of the 7 tons of sodium carbonate medicament can be reduced every day, the device operation cost is saved, the carbon dioxide waste gas emission is reduced, the carbon emission is reduced, and the environment is protected. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is a main view structural schematic diagram of the low-pressure carbon dioxide grey water hardening device.

[0019] Figure 2 It is a control system schematic diagram of the low-pressure carbon dioxide grey water hardening device.

[0020] Figure 3 It is a reaction control schematic diagram of the low-pressure carbon dioxide grey water hardening device.

[0021] Figure 4 It is a reaction flow schematic diagram of the low-pressure carbon dioxide grey water hardening device.

[0022] In the figure: 1, PH adjusting pool; 2, reaction pool; 3, coagulation pool; 4, flocculation pool; 5, sedimentation pool; 6, PH counter-adjusting pool; 7, water production pool; 8, suction pump; 9, connecting pipe; 10, suction pipe; 11, first dosing pipe; 12, second dosing pipe; 13, third dosing pipe; 14, fourth dosing pipe; 15, fifth dosing pipe. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

[0024] The terms "first", "second" and the like in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first", "second" and the like are generally of a kind, and are not limited to the number of objects, for example, the first object can be one or more. In addition, "and / or" in the specification and claims means at least one of the connected objects, and the character " / ", generally represents that the front and rear associated objects are in an "or" relationship.

[0025] In the description of the present application, it should be understood that the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0026] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "arrangement" should be understood broadly, for example, it can be fixedly connected, arranged, or detachably connected, arranged, or integrally connected, arranged. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0027] Please refer to Figures 1 to 4 In the embodiment of the present application, the low-pressure carbon dioxide ash water hardness removal device comprises a PH adjusting tank 1, one end of the PH adjusting tank 1 is provided with a reaction tank 2, one end of the reaction tank 2 away from the PH adjusting tank 1 is provided with a coagulation tank 3, one end of the coagulation tank 3 away from the reaction tank 2 is provided with a flocculation tank 4, one end of the flocculation tank 4 away from the coagulation tank 3 is provided with a sedimentation tank 5, one end of the sedimentation tank 5 away from the flocculation tank 4 is provided with a PH counter tank 6, one end of the PH counter tank 6 away from the sedimentation tank 5 is provided with a water production tank 7, and one end of the PH adjusting tank 1, the reaction tank 2, the coagulation tank 3, the flocculation tank 4, the sedimentation tank 5, the PH counter tank 6 and the water production tank 7 are fixedly connected with a connecting pipe 9.

[0028] One end of the sedimentation tank 5 is provided with a suction pump 8, and the output end of the suction pump 8 is arranged towards one end of the sedimentation tank 5. The output end of the suction pump 8 is fixedly connected with a suction pipe 10, and one end of the suction pipe 10 away from the suction pump 8 is fixedly connected with the bottom end of the sedimentation tank 5.

[0029] The top end side wall of one side of the PH adjusting tank 1 is fixedly connected with a first dosing pipe 11, and the top end side wall of one side of the reaction tank 2 is fixedly connected with a second dosing pipe 12. The top end side wall of one side of the coagulation tank 3 is fixedly connected with a third dosing pipe 13, and the top end side wall of one side of the flocculation tank 4 is fixedly connected with a fourth dosing pipe 14. The top end side wall of one side of the PH counter tank 6 is fixedly connected with a fifth dosing pipe 15.

[0030]

[0031] The grey water is pumped into the reaction tank 1 by the grey water pump, NaOH is added, the pH is adjusted to alkaline, then enters the reaction tank 2, sodium carbonate is added for hardness removal reaction, the water after reaction enters the coagulation and flocculation tank, PAC and PAM are added for coagulation and flocculation reaction, the precipitated particles are made larger, which is beneficial to the subsequent sedimentation and separation in the sedimentation tank. The clear water after separation is adjusted to neutral by pH, then enters the water production tank, and is pumped back to the system by the clear water pump for recycling.

[0032] The sludge at the bottom of the sedimentation tank is transported to the original sludge dewatering system of the grey water system for drying treatment by the sludge pump.

[0033] Reaction principle description

[0034] Sodium hydroxide is generally used to remove carbonate hardness and magnesium hardness in water, and soda ash is used to remove non-carbonate hardness. The reaction equations are as follows:

[0035] Remove part of temporary hardness:

[0036] Ca(HCO3)2+2NaOH→CaCO3↓+Na2CO3+H2O

[0037] Mg(HCO3)2+4NaOH→Mg(OH)2↓+2Na2CO3+2H2O

[0038] MgSO4+2NaOH→Mg(OH)2↓+Na2SO4

[0039] MgCl2+2NaOH→Mg(OH)2↓+2NaCl

[0040] Remove permanent hardness in water:

[0041] CaSO4+Na2CO3→CaCO3↓+Na2SO4

[0042] CaCl2+Na2CO3→CaCO3↓+2NaCl

[0043] Ca(HCO3)2+Na2CO3→CaCO3↓+2NaHCO3

[0044] Mg(HCO3)2+Na2CO3→MgCO3+2NaHCO3

[0045] At a higher pH, MgCO3 hydrolyzes quickly:

[0046] MgCO3+H2O→Mg(OH)2↓+CO2↑

[0047] CO2+2NaOH=Na2CO3.

[0048] Please refer to Figure 4In the present embodiment:

[0049] The grey water is pumped into the pH adjusting tank by the grey water pump, NaOH is added, the pH is adjusted to alkaline, then enters the reaction tank, carbon dioxide gas is introduced for hardness removal reaction, the water after reaction enters the coagulation and flocculation tank, PAC and PAM are added for coagulation and flocculation reaction, the precipitated particles are enlarged, which is beneficial to the subsequent precipitation and separation in the sedimentation tank. The separated clear water is adjusted to neutral by pH, then enters the water production tank, and is pumped back to the system by the clear water pump for recycling.

[0050] The sludge at the bottom of the sedimentation tank is transported to the original sludge dewatering system of the grey water system by the sludge pump for drying treatment.

[0051] Reaction principle

[0052] Sodium hydroxide is generally used to remove carbonate hardness and magnesium hardness in water, and soda ash is used to remove non-carbonate hardness. The reaction equations are as follows:

[0053] Carbon dioxide is introduced into the alkaline environment to generate sodium carbonate and carbonic acid:

[0054] CO2+2NaOH=Na2CO3

[0055] CO2+H2O=H2CO3

[0056] Remove part of temporary hardness:

[0057] Ca(HCO3)2+2NaOH→CaCO3↓+Na2CO3+H2O

[0058] Mg(HCO3)2+4NaOH→Mg(OH)2↓+2Na2CO3+2H2O

[0059] MgSO4+2NaOH→Mg(OH)2↓+Na2SO4

[0060] MgC l 2+2NaOH→Mg(OH)2↓+2NaCL

[0061] Remove permanent hardness in water:

[0062] CaSO4+Na2CO3→CaCO3↓+Na2SO4

[0063] CaC l 2+Na2CO3→CaCO3↓+2NaC l

[0064] Ca(HCO3)2+Na2CO3→CaCO3↓+2NaHCO3

[0065] Mg(HCO3)2+Na2CO3→MgCO3+2NaHCO3

[0066] At higher pH, MgCO3 hydrolyzes quickly:

[0067] MgCO3 + H2O → Mg(OH)2↓ + CO2↑

[0068] CO2 + 2NaOH = Na2CO3.

[0069] The annual savings in the cost of purchasing reagents are calculated as follows:

[0070] 7 tons of sodium carbonate are saved each day, and the purchase price of sodium carbonate is 2329.9 yuan per ton. The annual savings are calculated based on 330 days of operation. Annual savings: 7 tons / day x 2329.9 yuan / ton x 330 days = 5382069 yuan.

[0071] Through a large number of chemical books and experimental verification, it is found that carbon dioxide can be well dissolved in water in an alkaline environment to generate carbonic acid and carbonate ions. The carbonate ions rapidly combine with calcium and magnesium ions in the lime water in an alkaline environment to form calcium carbonate and magnesium carbonate precipitates.

[0072] In general, the amount of carbon dioxide dissolved in water is small, but by adjusting the pH of the solution and making a unique distributor, carbon dioxide can be well dissolved in water to generate carbonic acid and carbonate ions, which participate in the hardness removal reaction. That is, the cost of purchasing reagents is saved, carbon dioxide emissions are reduced, carbon emissions are reduced, and the natural environment is protected.

[0073] It should be noted that in this document, the terms "comprise", "comprise", or any other variant thereof are intended to cover non-exclusive inclusion, so that processes, methods, articles or devices that include a series of elements not only include those elements, but also include other elements not explicitly listed, or include elements inherent to such processes, methods, articles or devices. Without more limitations, the element defined by the statement "comprises a" does not exclude the presence of additional identical elements in the process, method, article or device that includes the element. In addition, it should be noted that the scope of the methods and devices in the embodiments of the present application is not limited to the order of performing the functions as shown or discussed, but can also include performing the functions in a substantially simultaneous manner or in reverse order, for example. The described method can be performed in an order different from that described, and various steps can be added, omitted, or combined. In addition, features described with reference to certain examples can be combined in other examples.

[0074] The embodiments of the present application are described above with reference to the accompanying drawings, but the present application is not limited to the specific embodiments described above, and the specific embodiments described above are merely illustrative, but not restrictive, and a person of ordinary skill in the art can make many forms under the inspiration of the present application without departing from the purpose of the present application and the scope protected by the claims.

Claims

1. A low pressure carbon dioxide brine water softening device comprising a pH regulating tank (1), characterized in that: One end of the PH adjusting tank (1) is provided with a reaction tank (2), and the other end of the reaction tank (2) is provided with a coagulation tank (3), and the other end of the coagulation tank (3) is provided with a flocculation tank (4), and the other end of the flocculation tank (4) is provided with a sedimentation tank (5), and the other end of the sedimentation tank (5) is provided with a PH counter tank (6), and the other end of the PH counter tank (6) is provided with a water production tank (7), and the other end of the PH adjusting tank (1), the reaction tank (2), the coagulation tank (3), the flocculation tank (4), the sedimentation tank (5), the PH counter tank (6) and the water production tank (7) are fixedly connected with the connecting pipe (9) penetrating each other.

2. The low pressure carbon dioxide lime water softening device of claim 1, wherein: One end of the sedimentation tank (5) is provided with a suction pump (8), and the output end of the suction pump (8) is arranged towards one end of the sedimentation tank (5).

3. The low pressure carbon dioxide lime water softening device of claim 2, wherein: The output end of the suction pump (8) is fixedly connected with a suction pipe (10), and the other end of the suction pipe (10) is fixedly connected with the bottom end of the sedimentation tank (5).

4. The low pressure carbon dioxide lime water softening device of claim 1, wherein: The top side wall of one side of the PH adjusting tank (1) is fixedly connected with a first dosing pipe (11) penetrating through, and the top side wall of one side of the reaction tank (2) is fixedly connected with a second dosing pipe (12) penetrating through.

5. The low pressure carbon dioxide lime water softening device of claim 1, wherein: The top side wall of one side of the coagulation tank (3) is fixedly connected with a third dosing pipe (13) penetrating through, and the top side wall of one side of the flocculation tank (4) is fixedly connected with a fourth dosing pipe (14) penetrating through.

6. The low pressure carbon dioxide lime water softening device of claim 1, wherein: The top side wall of one side of the PH counter tank (6) is fixedly connected with a fifth dosing pipe (15) penetrating through.

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