A cutting fluid waste treatment device

Abstract

This invention relates to the field of environmental protection equipment technology, specifically to a cutting fluid waste treatment device; it includes a storage tank, a distillation kettle, a condenser, a vacuum pump, a recovery tank, and a heat source, and also includes a buffer tank. The condenser is installed inside the buffer tank. The distillation kettle, condenser, recovery tank, and buffer tank are connected sequentially via pipelines. The vacuum pump is connected to the distillation kettle or the recovery tank via pipelines. The buffer tank is equipped with a drain valve. The heat source is connected to the distillation kettle, which is equipped with a liquid level balancing structure. The liquid level balancing structure is connected to the storage tank via pipelines. This invention has a reasonable structure and can effectively treat industrial waste liquid. The vacuum pump does not need to operate continuously or frequently start and stop. During the replenishment of the distillation kettle and the drainage of the recovery tank, the pressure loss is small. The liquid level balancing structure can automatically replenish the distillation kettle, resulting in low energy consumption and high working efficiency.

Description

Technical Field

[0001] This invention relates to the field of environmental protection equipment technology, specifically to a cutting fluid waste treatment device. Background Technology

[0002] Due to economic development, industrial production processes have polluted the environment, impacting human living conditions. Industrial wastewater is considered environmental waste and cannot be discharged arbitrarily; therefore, it must be properly treated to prevent further pollution. Reducing waste pollution and promoting water recycling are environmental issues that businesses must address.

[0003] Because industrial wastewater contains a significant proportion (approximately 80-90%) of water, storing it requires a very large space, is inconvenient to transport, and direct treatment is very costly. Therefore, the cost of wastewater treatment is substantial. It is necessary to remove the high proportion of water from the wastewater, retaining only a very small amount of residual pollutants that require treatment, thus achieving both environmental and economic benefits in wastewater treatment.

[0004] Existing wastewater treatment methods primarily separate water from waste through low-temperature distillation, compressing the volume of the waste liquid for subsequent transfer and treatment. This process requires vacuuming the still to lower the boiling point of water; however, the pressure inside the still gradually decreases during distillation, affecting the distillation efficiency. Simultaneously, the compressor unit needs to be constantly started and stopped for pressurization and pressure maintenance, resulting in high energy consumption and significantly impacting the equipment's lifespan. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings and deficiencies of existing technologies by providing a cutting fluid waste treatment device that is structurally sound, capable of continuous processing, has low energy consumption, and is highly efficient.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] The present invention discloses a cutting fluid waste treatment device, comprising a storage tank, a distillation kettle, a condenser, a vacuum pump, a recovery tank, and a heat source, and further comprising a buffer tank. The condenser is disposed inside the buffer tank. The distillation kettle, condenser, recovery tank, and buffer tank are sequentially connected by pipelines. The vacuum pump is connected to the recovery tank by pipelines. The buffer tank is equipped with a drain valve. The heat source is connected to the distillation kettle, which is equipped with a liquid level balancing structure. The liquid level balancing structure is connected to the storage tank by pipelines.

[0008] According to the above scheme, the vacuum pump is equipped with a negative pressure chamber, the vacuum pump is connected to the negative pressure chamber through a pipeline, the negative pressure chamber is connected to the recovery tank through a pipeline, and a self-balancing valve is provided on the pipeline between the negative pressure chamber and the recovery tank.

[0009] According to the above scheme, the self-balancing valve is provided with an air inlet, an actuation chamber and an air outlet connected in sequence. The actuation chamber is provided with a fixed ring, a butterfly valve and a stop ring. The fixed ring is located inside the stop ring and fixes the inner ring of the butterfly valve inside the actuation chamber. The butterfly valve is movably mounted on the stop ring.

[0010] According to the above scheme, the self-balancing valve includes a valve seat, a valve cover, and a valve body, with several valve bodies stacked sequentially between the valve cover and the valve seat; the actuating chamber is located on the lower end face of the valve body, and the fixing ring and the stop ring are located on the upper end face of the valve body, with two adjacent valve bodies paired up vertically; the valve seat is paired with the bottommost valve body, and the valve seat has an air inlet hole communicating with the actuating chamber; the valve cover is paired with the topmost valve body, and the valve cover has an air outlet hole communicating with the actuating chamber; a sealing ring is provided between the valve cover, the valve body, and the valve seat.

[0011] According to the above scheme, the valve cover, valve body and valve seat are sequentially connected in series on the connecting rod.

[0012] According to the above scheme, both the buffer tank and the recovery tank are equipped with water level sensors. A pressure balancing pipe and a water level balancing pipe are connected between the recovery tank and the buffer tank. A pressure regulating solenoid valve is installed on the pressure balancing pipe, and a reflux solenoid valve is installed on the water level balancing pipe.

[0013] According to the above scheme, the liquid level balancing structure includes a first shut-off valve, a second shut-off valve, and a liquid level sensor. The first and second shut-off valves are installed on the distillation kettle, and the liquid level sensor is installed inside the distillation kettle. The first shut-off valve is connected to the storage tank through a pipeline, and the second shut-off valve is connected to the condenser through a pipeline. A waste discharge valve is provided at the bottom of the distillation kettle.

[0014] According to the above scheme, the storage tank is equipped with a wave-damping baffle, which divides the storage tank into a sedimentation zone and a replenishment tank. The wave-damping baffle is equipped with a filter layer, and the first shut-off valve is connected to the replenishment tank through a pipeline. The replenishment tank is equipped with an oil separator, the lower end of which is fixedly connected to the wave-damping baffle, and the upper end of which is equipped with a float chain. The upper end of the wave-damping baffle is connected to the float chain through a rope.

[0015] The beneficial effects of this invention are as follows: the invention has a reasonable structure and can effectively treat industrial waste liquid; the vacuum pump does not need to work continuously or start and stop frequently, resulting in low energy consumption; during the replenishment of the distillation kettle and the discharge of the recovery tank, the pressure loss is small; the liquid level balancing structure can automatically replenish the distillation kettle; the condenser can effectively utilize the recovered water; and the overall working efficiency is high. Attached Figure Description

[0016] Figure 1 This is a schematic diagram illustrating the overall principle of the present invention;

[0017] Figure 2 This is a schematic diagram of the connection structure of the various components of the present invention;

[0018] Figure 3 This is a schematic cross-sectional view of the self-balancing valve of the present invention;

[0019] Figure 4 This is a schematic diagram of the liquid storage tank structure of the present invention.

[0020] In the picture:

[0021] 1. Storage tank; 2. Distillation kettle; 3. Condenser; 4. Vacuum pump; 5. Recovery tank; 6. Buffer tank; 11. Wave baffle; 12. Filter layer; 13. Oil separator; 14. Float chain; 101. Sedimentation zone; 102. Make-up tank; 21. Heat source; 22. First shut-off valve; 23. Second shut-off valve; 24. Waste discharge valve; 41. Negative pressure chamber; 51. Mounting ring; 52. Butterfly valve; 53. Shut-off ring; 54. Valve seat; 55. Valve cover; 56. Valve body; 57. Sealing ring; 58. Connecting rod; 501. Self-balancing valve; 502. Air inlet; 503. Actuating chamber; 504. Air outlet; 61. Drain valve; 62. Pressure balancing pipe; 63. Water level balancing pipe; 64. Pressure regulating solenoid valve; 65. Return solenoid valve. Detailed Implementation

[0022] The technical solution of the present invention will be described below with reference to the accompanying drawings and embodiments.

[0023] like Figure 1-4 As shown, the cutting fluid waste treatment device of the present invention includes a storage tank 1, a distillation kettle 2, a condenser 3, a vacuum pump 4, a recovery tank 5, and a heat source 21, and also includes a buffer tank 6. The condenser 3 is installed inside the buffer tank 6. The distillation kettle 2, the condenser 3, the recovery tank 5, and the buffer tank 6 are connected in sequence by pipelines. The vacuum pump 4 is connected to the recovery tank 5 by pipelines. The buffer tank 6 is equipped with a drain valve 61. The heat source 21 is connected to the distillation kettle 2. The distillation kettle 2 is equipped with a liquid level balancing structure, which is connected to the storage tank 1 by pipelines.

[0024] The storage tank 1 stores industrial waste liquid containing components such as lubricating oil / grease, water, and metal powder, with water having the highest content. First, the waste liquid is introduced into the distillation kettle 2. Both the distillation kettle 2 and the recovery tank 5 are sealed and connected via a condenser 3. The vacuum pump 4 is existing technology and will not be described in detail here. The vacuum pump 4 is connected to either the distillation kettle 2 or the recovery tank 5, which reduces the pressure inside the distillation kettle 2. Typically, the pressure inside the distillation kettle 2 is set at around 30 mmHg.

[0025] The heat source 21 heats the distillation vessel 2 and controls the temperature at 30-40℃. Based on the low-pressure conditions of the distillation vessel 2, the water in the waste liquid inside the distillation vessel 2 vaporizes and enters the condenser 3. The gaseous water is cooled after passing through the condenser 3 and stored in the recovery tank 5. Preferably, the condenser 3 is located inside the buffer tank 6, and the cooling water in the buffer tank 6 comes from the recovery tank 5. The condenser 3 can directly utilize the condensate in the buffer tank 6 for rapid cooling.

[0026] It is understood that the distillation vessel 2, condenser 3 and recovery tank 5 constitute the main body of waste liquid treatment, used to complete the main distillation, condensation and recovery processes. Of course, the buffer tank 6 works in conjunction with the condenser 3 by utilizing its own heat dissipation and the recovered water.

[0027] The vacuum pump 4 is connected to the recovery tank 5. The gas pressure in the distillation kettle 2, condenser 3, and recovery tank 5 is consistent. A shut-off valve is installed on the pipeline between the vacuum pump 4 and the recovery tank 5 to control the gas pressure. As the distillation process proceeds, the liquid level in the distillation kettle 2 decreases while the liquid level in the recovery tank 5 rises, triggering the liquid level balancing structure to replenish the distillation kettle 2. At this time, the pipeline between the distillation kettle 2 and the condenser 3, or between the condenser 3 and the recovery tank 5, is cut off. The liquid level balancing structure is activated, and the distillation kettle 2 draws waste liquid from the storage tank 1 under negative pressure to replenish it until the liquid level in the distillation kettle 2 returns to the set value. It can be understood that the liquid level balancing structure can also be considered as a shut-off valve (automatic / manual) acting on the control pipeline, capable of cutting off or opening the pipeline between the storage tank 1 and the distillation kettle 2.

[0028] As mentioned above, vacuum pump 4 can also be connected to distillation vessel 2. When the liquid level in distillation vessel 2 is too low, the pipeline between vacuum pump 4 and distillation vessel 2 can be cut off.

[0029] Then, the distillation vessel 2 is reconnected to the recovery tank 5, and the vacuum pump 4 begins to compensate for the pressure loss caused by the liquid absorption in the distillation vessel 2, so that the pressure inside the distillation vessel 2 returns to the set pressure value. Since the distillation vessel 2 is relatively independent during the liquid replenishment process, and the liquid replenishment adopts a siphon method, the pressure loss inside the distillation vessel 2 during the liquid replenishment process is small, and the vacuum pump 4 only needs to replenish a small amount of pressure to maintain the working pressure inside the distillation vessel 2.

[0030] In the distillation process described above, the vacuuming stage consumes the most energy. Reducing pressure loss can effectively lower the energy consumption in the waste liquid treatment process.

[0031] The vacuum pump 4 is equipped with a negative pressure chamber 41, which is connected to the vacuum pump 4 via a pipeline. The negative pressure chamber 41 is connected to the recovery tank 5 via a pipeline, and a self-balancing valve 501 is installed on the pipeline between the negative pressure chamber 41 and the recovery tank 5. The vacuum pump 4 first extracts air from the negative pressure chamber 41, making the pressure inside the negative pressure chamber 41 lower than the working pressure (30 mmHg) of the distillation vessel 2. Then, the vacuum pump 4 stops or idles. It is understood that a pressure gauge is installed on the negative pressure chamber 41, and the vacuum pump 4 is equipped with an automatic start / stop controller. When the distillation vessel 2 is replenished with liquid, the internal pressure drops. Then, the pipeline between the distillation vessel 2, the condenser 3, and the recovery tank 5 is reconnected, creating a pressure difference between the three and the negative pressure chamber 41. The self-balancing valve 501 automatically opens, causing the pressure inside the distillation vessel 2 to drop rapidly to the working pressure, thereby allowing the distillation vessel 2 to enter the distillation state again, improving working efficiency.

[0032] The self-balancing valve 501 is provided with an air inlet 502, an actuation chamber 503, and an air outlet 504 connected in sequence. The actuation chamber 503 contains a fixed ring 51, a butterfly valve 52, and a stop ring 53. The fixed ring 51 is located within the stop ring 53, fixing the inner ring of the butterfly valve 52 within the actuation chamber 503. The butterfly valve 52 is movably mounted on the stop ring 53. Similarly, a certain pressure difference exists between the negative pressure chamber 41 and the recovery tank 5 and the distillation vessel 2. When the distillation vessel 2 loses pressure, the self-balancing valve 501 opens, restoring the pressure inside the distillation vessel 2 to normal. Therefore, when the pressure difference between the negative pressure chamber 41 and the distillation vessel 2 is within the normal range, the self-balancing valve 501 is in the closed state. Furthermore, the air inlet 502, the actuation chamber 503, and the air outlet 504 form the passage of the self-balancing valve 501, and the on / off state of the air inlet 502 and the air outlet 504 is controlled by the butterfly valve 52. When the pressure difference is less than the closing force of the butterfly valve 52, the passage between the air inlet 502 and the air outlet 504 is broken. When the distillation vessel 2 loses pressure, the butterfly valve 52 deforms, causing the passage of the self-balancing valve 501 to open, so that the distillation vessel 2 can be restored to the normal working pressure.

[0033] In particular, the butterfly valve 52 is elastic and can reset itself. Under the action of pressure difference, it can open / close the passage of the self-balancing valve 501, so that the vacuum pump 4 only needs to maintain the pressure setting of the negative pressure chamber 41 and does not need to be turned on all the time, thereby reducing energy consumption and increasing equipment life.

[0034] Specifically, the self-balancing valve 501 includes a valve seat 54, a valve cover 55, and a valve body 56, with several valve bodies 56 stacked sequentially between the valve cover 55 and the valve seat 54; the actuating chamber 503 is located on the lower end face of the valve body 56, and the fixing ring 51 and the stop ring 53 are located on the upper end face of the valve body 56, with adjacent valve bodies 56 paired vertically; the valve seat 54 is paired with the bottommost valve body 56, and the valve seat 54 has an air inlet 502 communicating with the actuating chamber 503; the valve cover 55 is paired with the topmost valve body 56, and the valve cover 55 has an air outlet 504 communicating with the actuating chamber 503; and a sealing ring 57 is provided between the valve cover 55, the valve body 56, and the valve seat 54.

[0035] Preferably, the threshold of the self-balancing valve 501 is adjustable; that is, the pressure difference range between the negative pressure chamber 41 and the distillation vessel 2 can be changed by increasing the number of valve bodies 56 or changing the psi value of the butterfly valve 52. In particular, the valve cover 55, valve body 56, and valve seat 54 are sequentially connected in series on the connecting rod 58, and the threshold of the outer self-balancing valve 501 can be adjusted by adding valve bodies 56 to the connecting rod 58.

[0036] Both the buffer tank 6 and the recovery tank 5 are equipped with water level sensors. A pressure balancing pipe 62 and a water level balancing pipe 63 connect the recovery tank 5 and the buffer tank 6. A pressure regulating solenoid valve 64 is installed on the pressure balancing pipe 62, and a reflux solenoid valve 65 is installed on the water level balancing pipe 63. The water vapor generated in the distillation kettle 2 passes through the condenser 3 and forms condensate, which is stored in the recovery tank 5. During the distillation process in the distillation kettle 2, the condensation of water vapor is continuous, and heat is released during condensation. The recovery tank 5 serves a heat dissipation function.

[0037] Furthermore, when the recovery tank 5 needs to be drained, the pipeline between the condenser 3 and the recovery tank 5, as well as the pipeline between the recovery tank 5 and the negative pressure chamber 41, are first disconnected (this pipeline is equipped with a shut-off valve in addition to the self-balancing valve 501). It is understood that the buffer tank 6 is under normal pressure. After draining the water inside through the drain valve 61, the pressure regulating solenoid valve 64 and the return solenoid valve 65 are opened. The pressure balancing pipe 62 balances the pressure between the buffer tank 6 and the recovery tank 5, allowing water in the recovery tank 5 to flow to the buffer tank 6, thus replenishing the condensate in the buffer tank 6.

[0038] In particular, during the above process, the recovery tank 5 only loses a small amount of pressure to complete the drainage process, and the connection between the buffer tank 6 and the recovery tank 5 through the pressure balance pipe 62 allows water to flow rapidly, improving drainage efficiency. Furthermore, after completing the above drainage process, the shut-off valve between the recovery tank 5 and the negative pressure chamber 41 is opened, allowing the self-balancing valve 501 to automatically control and restore the pressure in the recovery tank 5 and the distillation vessel 2 to the working pressure, thereby restarting the distillation process.

[0039] It is understood that the gaseous water in the condenser 3 will be converted into liquid water. The height of the gas inlet end of the condenser 3 (connected to the distillation vessel 2) is greater than that of the water outlet end of the condenser 3 (connected to the recovery tank 5). Therefore, the buffer tank 6 needs to be higher than the recovery tank 5. Simply put, the buffer tank 6 can be set on top of the recovery tank 5 so that the condensate in the condenser 3 can automatically flow into the recovery tank 5.

[0040] Furthermore, when the pressure balancing pipe 62 and the water level balancing pipe 63 are connected, the air pressure in the buffer tank 6 will be replenished to the recovery tank 5, the pressure in the buffer tank 6 will decrease rapidly, and the pressure in the recovery tank 5 will increase rapidly. Thus, the condensate in the recovery tank 5 will be recovered through the siphon effect, eliminating the need for a water pump and saving energy.

[0041] The liquid level balancing structure includes a first shut-off valve 22, a second shut-off valve 23, and a liquid level sensor. The first and second shut-off valves 22 and 23 are mounted on the distillation vessel 2, and the liquid level sensor is located inside the distillation vessel 2. The first shut-off valve 22 is connected to the storage tank 1 via a pipeline, and the second shut-off valve 23 is connected to the condenser 3 via a pipeline. A waste discharge valve 24 is located at the bottom of the distillation vessel 2. It is understood that the distillation vessel 2 requires liquid replenishment and waste discharge. To reduce pressure loss, the second shut-off valve 23 is installed on the distillation vessel 2 to close the pipeline between the condenser 3. The first shut-off valve 22 is controlled by the liquid level sensor; when the liquid level in the distillation vessel 2 is too low, the first shut-off valve 22 opens to perform the liquid replenishment process. The waste discharge process of the waste discharge valve 24 is well known to those skilled in the art and will not be described in detail. The waste discharge valve 24 can also be replaced by other structures.

[0042] The storage tank 1 is equipped with a wave-damping baffle 11, which divides the storage tank 1 into a sedimentation zone 101 and a replenishment tank 102. A filter layer 12 is installed on the wave-damping baffle 11, and a first shut-off valve 22 is connected to the replenishment tank 102 via a pipeline. An oil-separating mesh 13 is installed in the replenishment tank 102. The lower end of the oil-separating mesh 13 is fixedly connected to the wave-damping baffle 11, and a float chain 14 is installed at the upper end of the oil-separating mesh 13. The upper end of the wave-damping baffle 11 is connected to the float chain 14 via a rope. Typical industrial wastewater contains a large amount of metal powder, oil, grease, etc. The sedimentation zone 101 can remove metal powder, and the filter mesh 13 removes solid impurities, preventing damage to the pipeline and the first shut-off valve 22. Simultaneously, the oil-separating mesh 13 floats on the surface of the wastewater via the float chain 14, blocking grease impurities on the upper layer of the wastewater, thus providing preliminary filtration. The pre-treated wastewater then enters the distillation kettle 2 for distillation, effectively improving the wastewater treatment efficiency and effect, while also extending the service life of the equipment.

[0043] The above description is only a preferred embodiment of the present invention. Therefore, all equivalent changes or modifications made to the structure, features and principles described in the claims of this patent application are included in the scope of this patent application.

Claims

1. A cutting fluid waste treatment device, comprising a storage tank (1), a distillation kettle (2), a condenser (3), a vacuum pump (4), a recovery tank (5), and a heat source (21), characterized in that: It also includes a buffer tank (6), the condenser (3) is installed inside the buffer tank (6), and the distillation kettle (2), condenser (3), recovery tank (5) and buffer tank (6) are connected in sequence through pipelines; the vacuum pump (4) is connected to the recovery tank (5) through pipelines, and the buffer tank (6) is equipped with a drain valve (61); the heat source (21) is connected to the distillation kettle (2), and the distillation kettle (2) is equipped with a liquid level balancing structure, which is connected to the liquid storage tank (1) through pipelines; The vacuum pump (4) is equipped with a negative pressure chamber (41), the vacuum pump (4) is connected to the negative pressure chamber (41) through a pipeline, the negative pressure chamber (41) is connected to the recovery tank (5) through a pipeline, and a self-balancing valve (501) is provided on the pipeline between the negative pressure chamber (41) and the recovery tank (5). The self-balancing valve (501) is provided with an air inlet (502), an actuation chamber (503) and an air outlet (504) connected in sequence. The actuation chamber (503) is provided with a mounting ring (51), a butterfly valve (52) and a stop ring (53). The mounting ring (51) is located inside the stop ring (53). The mounting ring (51) fixes the inner ring of the butterfly valve (52) inside the actuation chamber (503). The butterfly valve (52) is movably covered on the stop ring (53). The self-balancing valve (501) includes a valve seat (54), a valve cover (55), and a valve body (56). Several valve bodies (56) are stacked sequentially between the valve cover (55) and the valve seat (54). The actuation chamber (503) is located on the lower end face of the valve body (56), and the mounting ring (51) and the stop ring (53) are located on the upper end face of the valve body (56). Two adjacent valve bodies (56) are paired up and down. The valve seat (54) is paired with the bottom valve body (56), and the valve seat (54) is provided with an air inlet (502) that communicates with the actuation chamber (503). The valve cover (55) is paired with the top valve body (56), and the valve cover (55) is provided with an air outlet (504) that communicates with the actuation chamber (503). A sealing ring (57) is provided between the valve cover (55), the valve body (56), and the valve seat (54).

2. The cutting fluid waste treatment device according to claim 1, characterized in that: The valve cover (55), valve body (56) and valve seat (54) are sequentially connected in series on the connecting rod (58).

3. The cutting fluid waste treatment device according to claim 1, characterized in that: Both the buffer tank (6) and the recovery tank (5) are equipped with water level sensors. A pressure balancing pipe (62) and a water level balancing pipe (63) are connected between the recovery tank (5) and the buffer tank (6). A pressure regulating solenoid valve (64) is provided on the pressure balancing pipe (62), and a return solenoid valve (65) is provided on the water level balancing pipe (63).

4. The cutting fluid waste treatment device according to claim 1, characterized in that: The liquid level balancing structure includes a first shut-off valve (22), a second shut-off valve (23), and a liquid level sensor. The first shut-off valve (22) and the second shut-off valve (23) are installed on the distillation kettle (2), and the liquid level sensor is installed inside the distillation kettle (2). The first shut-off valve (22) is connected to the storage tank (1) through a pipeline, and the second shut-off valve (23) is connected to the condenser (3) through a pipeline. A waste discharge valve (24) is provided at the bottom of the distillation kettle (2).

5. The cutting fluid waste treatment device according to claim 4, characterized in that: The storage tank (1) is equipped with a wave-breaking baffle (11), which divides the storage tank (1) into a sedimentation zone (101) and a replenishment tank (102). The wave-breaking baffle (11) is equipped with a filter layer (12), and the first shut-off valve (22) is connected to the replenishment tank (102) through a pipeline. The replenishment tank (102) is equipped with an oil separator (13), the lower end of which is fixedly connected to the wave-breaking baffle (11), and the upper end of which is equipped with a float chain (14). The upper end of the wave-breaking baffle (11) is connected to the float chain (14) through a rope.

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