An oxygen-free compressed gas production system

Abstract

The present application relates to a kind of oxygen-free compressed gas production systems, it is suitable for enterprise installed with gas boiler, boiler exhaust is carbon dioxide and water vapor, the flue gas of boiler exhaust is exchanged with boiler feed water, the temperature of flue gas is reduced, most water vapor is condensed and separated, and the gas of main component carbon dioxide is transported to compressor and compressed into oxygen-free compressed gas.And using the cooling condensation principle of cold dryer, water vapor in compressed gas is condensed.Again using the temperature difference of compressed gas in different delivery stages, using lower temperature compressed gas and higher temperature compressed gas contact, temperature change makes water vapor condense, further condense and separate water vapor in compressed gas.By the technical scheme, a kind of oxygen-free compressed gas mainly with carbon dioxide is produced, and the compressed gas is applied in special industrial field, which can effectively avoid the oxidation of compressed gas to equipment or product, and is beneficial to improve equipment service life and guarantee product quality.

Description

Technical Field

[0001] This invention belongs to the field of industrial oxygen-free compressed gas technology, and specifically relates to an oxygen-free compressed gas production system. Background Technology

[0002] Industrial enterprises use air to produce compressed gases. Air contains oxygen, and in special circumstances, if products or equipment are prone to oxidation, traditional compressed gases, due to their oxygen content, can easily cause oxidation, affecting equipment lifespan and even product quality. Especially when the volume of compressed gas used is large, using nitrogen or argon is too expensive. Therefore, there is a particular need for an oxygen-free or extremely low-oxygen-content, readily available oxygen-free compressed gas. This invention addresses this issue in enterprises with gas-fired boilers. Since boiler emissions are mainly carbon dioxide and water vapor, the flue gas is heat-exchanged with boiler feedwater, lowering the flue gas temperature and causing most of the water vapor to condense and separate. The gas, primarily composed of carbon dioxide, is then transported to a compressor and compressed into an oxygen-free compressed gas. To prevent the influence of moisture in the oxygen-free compressed gas, the density difference between water and carbon dioxide is utilized, and high-speed rotation further separates the moisture. Finally, the cooling and condensation principle of a refrigerated dryer is used to condense the water vapor in the compressed gas. At the same time, by taking advantage of the temperature difference at different stages of compressed gas transportation, and by having the lower-temperature compressed gas come into contact with the higher-temperature compressed gas, the water vapor in the compressed gas is condensed and separated due to the temperature change. Summary of the Invention

[0003] The purpose of this invention is to provide an oxygen-free compressed gas production system, which can effectively avoid oxidation of equipment or products caused by compressed gas by producing oxygen-free compressed gas with carbon dioxide as the main component, thereby improving the service life of equipment and ensuring product quality.

[0004] To achieve the above objectives, this application employs the following technical solution:

[0005] An oxygen-free compressed gas production system, wherein the outlet of a soft water pump is connected to the soft water inlet of an energy-saving device via a pipeline, the soft water outlet of the energy-saving device is connected to the soft water inlet of a deaerator via a pipeline, and the outlet of the deaerator is connected to the boiler inlet via a pipeline.

[0006] The boiler steam outlet is connected to the steam inlet of the steam distributor via a pipeline. The first outlet of the steam distributor is connected to the production unit via a pipeline, and the second outlet of the steam distributor is connected to the steam inlet of the deaerator via a pipeline.

[0007] The boiler flue gas outlet is connected to the flue gas inlet of the economizer via a pipeline, the economizer flue gas outlet is connected to the flue gas inlet of the gas collecting tank via a pipeline, and the economizer condensate outlet is connected to the water collecting tank via a pipeline.

[0008] The outlet of the gas collecting tank is connected to the inlet of the first gas distributor via a pipeline. The outlet of the first gas distributor is connected to the inlet of the compressor via a pipeline. The outlet of the compressor is connected to the inlet of the first water distributor via a pipeline. The outlet of the first water distributor is connected to the first inlet of the heat exchanger via a pipeline. The first outlet of the heat exchanger is connected to the inlet of the refrigerated dryer via a pipeline. The outlet of the refrigerated dryer is connected to the main pipe. The main pipe is connected to the spray head inside the gas collecting tank via a return pipe. The main pipe is connected to the inlet of the second water distributor via a pipeline. The outlet of the second water distributor is connected to the second inlet of the heat exchanger via a pipeline. The second outlet of the heat exchanger is connected to the inlet of the third water distributor via a pipeline. The first and second outlets of the third water distributor are both connected to the second gas distributor via pipelines.

[0009] Furthermore, the first water distributor is equipped with a first baffle and a second baffle, which are distributed alternately.

[0010] Furthermore, the second water distributor includes bearings, blades, nozzles, air inlet pipes, water collection tanks, cylinders, rotating shafts, baffles, air outlet pipes, drain valves, and water pipes; the blades are mounted on the rotating shafts, and the upper and lower ends of the rotating shafts are respectively mounted on the cylinders via bearings; air inlet pipes and air outlet pipes are arranged opposite each other on the side walls of the cylinders; a nozzle is installed at the end of the air inlet pipe that extends into the cylinders; a baffle is arranged inside the cylinders opposite to the air outlet pipes; and the water collection tank is located at the bottom of the cylinders.

[0011] Furthermore, the top of the third water distributor is provided with a third water distributor air inlet, a filter bowl is provided inside the third water distributor, an inclined ladder and a third baffle are provided below the filter bowl, a drain outlet is provided on the side wall of the third water distributor corresponding to the inclined ladder, the top of the third water distributor is provided with a first air outlet of the third water distributor, and the second air outlet of the third water distributor is provided on the side wall of the third water distributor opposite to the drain outlet.

[0012] Furthermore, an air inlet / outlet valve assembly is installed on the top of the third water distributor, and the air inlet of the third water distributor and the first air outlet of the third water distributor are both located on the air inlet / outlet valve assembly.

[0013] Furthermore, the working principle of the intake valve assembly is as follows: when the intake port of the third water distributor on the intake and exhaust valve assembly is opened, a small amount of compressed gas at a lower temperature enters the top of the third water distributor through the intake and exhaust valve assembly and mixes with the compressed gas containing more water vapor. The compressed gas containing water vapor cools down, and the water vapor condenses and falls into the bottom of the filter bowl. At this time, the intake port of the third water distributor closes and the first outlet port of the third water distributor opens. The dry compressed gas with water vapor removed from the upper part of the filter bowl enters the second-stage air cylinder through the intake and exhaust valve assembly, the first outlet port of the third water distributor, and the pipeline, and circulates in this manner.

[0014] The beneficial effects of this invention are:

[0015] This technical solution is applicable to enterprises with gas-fired boilers. Since the boiler emissions are mainly carbon dioxide and water vapor, the flue gas is heat-exchanged with boiler feedwater, lowering the flue gas temperature and causing most of the water vapor to condense and separate. The gas, primarily composed of carbon dioxide, is then transported to a compressor for compression into an oxygen-free compressed gas. To prevent the influence of moisture in the oxygen-free compressed gas, the density difference between water and carbon dioxide is utilized, and high-speed rotation further separates the moisture. The cooling and condensation principle of a refrigerated dryer is also used to condense the water vapor in the compressed gas. Simultaneously, the temperature difference at different stages of gas transport is utilized; the contact between lower-temperature and higher-temperature compressed gas causes the water vapor to condense, further condensing and separating the water vapor. Therefore, this technical solution produces an oxygen-free compressed gas primarily composed of carbon dioxide. In specific industrial applications, this compressed gas can effectively prevent oxidation of equipment or products caused by compressed gas, thus improving equipment lifespan and ensuring product quality. Attached Figure Description

[0016] Figure 1 This is a process system diagram of the present invention.

[0017] Figure 2 This is a schematic diagram of the second water distributor of the present invention. Detailed Implementation

[0018] The technical solution of the present invention will be described in detail below with reference to the accompanying drawings. The following embodiments are merely exemplary and can only be used to explain and illustrate the technical solution of the present invention, and should not be construed as limiting the technical solution of the present invention.

[0019] like Figure 1 and Figure 2 As shown, this application provides an oxygen-free compressed gas production system. Soft water produced by water treatment 1 enters the soft water inlet side of economizer 4 through the outlet of soft water pump 3. The soft water exchanges heat with the flue gas discharged from boiler 115 in economizer 4. After absorbing heat and increasing temperature, the soft water flows out of economizer 4 and enters deaerator 140 through valve 125, water pipe 126, and electric valve 127. Steam generated by boiler 115 enters steam distribution cylinder 134 through valve 116, pipe 131, and valve 132. Part of the steam in steam distribution cylinder 134 is used for production through valve 135 and pipe 136, while another part of the steam enters deaerator 140 through valve 133, pipe 138, pipe 139, and electric valve 141 to heat the soft water inside for thermal deoxygenation. The deoxygenated soft water in deaerator 140 enters boiler 115 through pump set 129, water pipe 130, and valve 117 at the bottom to be heated and used to produce steam.

[0020] Meanwhile, the flue gas generated by boiler 115 enters the other side of the economizer 4 through valve 118 and flue 128, where it exchanges heat with soft water. The flue gas temperature decreases, and the water vapor in the flue gas condenses into water and falls into the water collection tank 123 at the bottom of the economizer 4. After a large amount of water vapor is condensed and separated, the gas, mainly composed of carbon dioxide, enters the gas collection tank 8 through flue 5 and one-way valve 6. At the same time, the return gas pipe 12 is connected to the main pipe 30. A small amount of low-temperature compressed gas flows out from the main pipe 30 and enters the gas collection tank 8 through the return gas pipe 12 and electric valve 11. It is sprayed into the gas collection tank by the spray head 10 inside the gas collection tank 8 and mixes with the relatively high-temperature gas therein. The gas temperature in the gas collection tank 8 decreases, and the water in the carbon dioxide condenses again and falls into the bottom of the gas collection tank 8. The relatively pure carbon dioxide gas enters the first gas distribution cylinder 119 through pipe 13, pipe 122, and valve 121.

[0021] A portion of the gas in the first gas separator 119 passes through valve 120, pipe 109, pipe 15, and valve 16, and then is filtered by filter cartridge 17 at the inlet of compressor 18 before entering compressor 18 and being compressed into compressed gas. The compressed gas flows out of compressor 18 and enters the first water distributor 22 through valve 19. The first water distributor 22 has a first baffle 20 and a second baffle 21, which are staggered. The baffles cause the water in the airflow in the first water distributor 22 to fall to its bottom. After the water droplets in the compressed gas are separated by the first water distributor 22, they pass through valve 23, filter 24, valve 25, pipe 80, and valve 72 into heat exchanger 54 to exchange heat with the ultra-low temperature compressed gas that has been cooled by the refrigerated dryer. A portion of the gas in the first gas separator 119 can also pass through valve 110, pipe 111, and valve 101, and then be filtered by filter cartridge 102 at the inlet of compressor 103 before entering compressor 103 and being compressed into compressed gas. The compressed gas flows out of compressor 103 and enters the fourth water distributor 92 through valve 100. The fourth water distributor 92 has a fourth baffle 93 and a fifth baffle 94, which are also staggered. The baffles cause the moisture in the airflow in the fourth water distributor 92 to fall to its bottom. After the moisture in the compressed gas is separated by the fourth water distributor 92, it passes through valve 89, filter 90, and valve 91, and then through pipe 80 and valve 72 into heat exchanger 54 to exchange heat with the ultra-low temperature compressed gas cooled by the refrigerated dryer.

[0022] After the compressed gas is initially cooled in the heat exchanger 54, it flows out through valve 73, pipe 76, and pipe 79. It can then enter the refrigerated dryer 28 through pipe 26 and valve 27, and enter the refrigerated dryer 83 through pipe 86 and valve 85, respectively. The compressed gas is further cooled to the leak point in the refrigerated dryer 28 and refrigerated dryer 83, and the moisture in the compressed gas is condensed back into water. The pure oxygen-free low-temperature compressed gas flows out of the refrigerated dryer 28 and refrigerated dryer 83, and enters the main pipe 30 through pipe 29 and pipe 84, respectively. To prevent the low-temperature compressed gas from containing condensate, the pipeline at the rear end of the refrigerated dryer is designed with multiple second water distributors (water distributor 32, water distributor 35, water distributor 66 and water distributor 69) with the same structure and principle. Water distributors 32, 35, 66 and 69 are mainly composed of bearing 143, blade 144, nozzle 145, air inlet pipe 146, water collection tank 147, cylinder 148, rotating shaft 149, baffle 150, air outlet pipe 151, bearing 152, drain valve 153, water pipe 154, etc. When compressed gas is sprayed from the inlet pipe 146 through the nozzle 145 onto the blades 144, the blades 144 rotate at high speed around the shaft 149. Through centrifugal force, the tiny water droplets condensed in the compressed gas are thrown against the inner wall of the cylinder 148 and fall into the bottom water collection tank 147. Then, they are discharged through the drain valve 152 and the water pipe 154. Moreover, after the compressed gas is separated from the condensate by the high-speed rotation of the blades 144, the condensate hits the baffle 149 at the inlet of the outlet pipe 151 on the other side of the cylinder 148. Even if a small amount of condensate remains, it will stick to the baffle 149 and flow into the water collection tank 147 along the baffle. After that, it flows out of the cylinder 148 and into the outlet pipe for transport to the rear. Therefore, the low-temperature compressed gas in the main pipe 30 can enter the water distributor 32 via electric valve 31, or the water distributor 35 via electric valve 64, or the water distributor 66 via electric valve 67, or the water distributor 69 via electric valve 70. The tiny condensate in the low-temperature compressed gas is separated by water distributors 32, 35, 66 and 69, and then enters the pipe 61 via electric valves 33, 60, 62 and 78. The compressed gas in the pipe 61 enters the heat exchanger 54 via pipe 63 and valve 58 to exchange heat with the higher-temperature compressed gas at the front end. In this way, the low-temperature compressed gas is heated, and even if a very small amount of water droplets are not separated in the low-temperature compressed gas, they will evaporate into water. Moreover, the low-temperature compressed gas is turned into room temperature compressed gas, which is more convenient to use.

[0023] Cooling the high-temperature compressed gas before it enters the refrigerated dryer helps it reach the leak point temperature and reduces the dryer's energy consumption. The compressed gas, heated to room temperature by heat exchanger 54, enters the third water distributor 41 via valves 59 and 55. The third water distributor 41 mainly consists of an inlet 36, a filter bowl 37, an outlet 39, an inlet / outlet valve assembly 40, a small orifice 42, a baffle 43, an inclined ladder 57, and a drain valve 56. The third baffle 43 is installed at a downward angle, and the inclined ladder 57 is horizontal and vertically downward. Because carbon dioxide has a higher density than water vapor, the compressed gas, after being blocked by the third baffle 43, is further degraded by the obstruction and influence of the third baffle 43 and the inclined ladder 57. Carbon flows downward along the third baffle 43, bypasses the bottom of the third baffle 43, and enters the second gas separator 48 through pipe 44 and valve 51. At this time, even if the compressed gas contains very little water droplets, they will stick to the third baffle 43 and flow downward along the third baffle 43 into the bottom of the third water separator 41. Meanwhile, the very little water vapor contained in the compressed gas presses the third baffle 43 upward through the small hole 42 into the filter bowl 37. The upper part of the filter bowl 37 has many small holes, while the bottom of the filter bowl 37 has no small holes and can be used to store water. Therefore, the gas in the space above the filter bowl 37 in the third water separator 41 is mostly water vapor.

[0024] The operation of the inlet and outlet valve group 40 at the top of the third water distributor 41 is as follows: the inlet side is open and the outlet side is closed, then the inlet side is closed and the outlet side is open, and so on alternately. When the inlet port (inlet port of the third water distributor) 36 of the inlet and outlet valve group 40 is open, a small amount of compressed gas at a lower temperature enters the top of the third water distributor 41 through pipes 61, 34, 35, inlet port 36, and inlet and outlet valve group 40 and mixes with the compressed gas with a higher water content. The compressed gas containing water is cooled down, and the water condenses and falls into the bottom of the filter bowl 37. At this time, the inlet port 36 of the inlet and outlet valve group 40 is closed and the outlet port 39 of the inlet and outlet valve group 40 is open. The dry compressed gas with water removed from the top of the filter bowl 37 flows out through the inlet and outlet valve group 40 and the outlet port 39, and then enters the air distribution cylinder 48 through pipes 38, 45, and valve 50. Then, the outlet 39 of the inlet / outlet valve assembly 40 is closed, and the inlet 36 of the inlet / outlet valve assembly 40 is opened. A small amount of compressed gas at a lower temperature enters the top of the water distributor 41 through pipes 61, 34, 35, inlet 36, and inlet / outlet valve assembly 40, where it mixes with the compressed gas containing more water vapor. The compressed gas containing water vapor is then cooled, causing the water vapor to condense. This cycle continues. Finally, the oxygen-free and dry compressed gas in the gas distribution cylinder 48 is transported to the gas consumption point 46 for use through valve 49 and pipe 47.

[0025] Since natural gas is mainly composed of methane, its combustion primarily produces water and carbon dioxide. The condensate generated during the production and drying of oxygen-free compressed gas can be recycled. Specifically, the condensate from the energy-saving device 4 flows into water pipe 108 via water collection tank 123 and water pipe 124. The condensate from the gas collection tank 8 also flows into water pipe 108 via bottom drain valve 14. The condensate from the compressor 18, water distributor 22, filter 24, and refrigerated dryer 28 flows into water pipe 107 via bottom drain valves 106, 105, 104, 88, and water pipe 87, respectively. After merging with water pipe 108, the condensate flows into water pipe 114 via water pipes 112 and 113. The condensate produced by compressor 103, distributor 92, filter 90, and refrigerated dryer 83 flows into water pipe 99 via bottom drain valves 98, 97, 96, 82, and water pipe 95, where it meets water pipe 112 and then flows into water pipe 114 via water pipe 113. Simultaneously, the condensate in distributors 32, 35, 66, and 69 flows into water pipe 77 via drain valves 34, 65, 68, and 71, and then into water pipe 114 via water pipe 81. The condensate generated in heat exchanger 54 enters water pipe 74 through bottom drain valve 75. The condensate at the bottom of filter bowl 37 on the upper part of distributor 41 flows into water pipe 74 through drain valve 76. The condensate at the bottom of distributor 41 flows into water pipe 74 through drain valve 53 and water pipe 52. The condensate in water pipe 74 then flows into water pipe 114 through water pipe 81. Finally, the condensate generated by each gas collector, compressor, distributor, filter, and heat exchanger flows into main water pipe 114, and then through water pipe 114, water pipe 137, water pipe 142, and valve 2 into water treatment 1 for treatment into qualified soft water for reuse, thereby saving water resources.

[0026] The above description is merely an embodiment of this application and is not intended to limit this application in any way. Although this application discloses preferred embodiments as described above, it is not intended to limit this application. Any changes or modifications made by those skilled in the art without departing from the scope of the technical solution of this application using the disclosed technical content are equivalent to equivalent implementation cases and fall within the scope of the technical solution.

Claims

1. An oxygen-free compressed gas production system, characterized by, The outlet of the soft water pump is connected to the soft water inlet of the energy-saving device through a pipeline, the soft water outlet of the energy-saving device is connected to the soft water inlet of the deaerator through a pipeline, and the outlet of the deaerator is connected to the boiler inlet through a pipeline. The boiler steam outlet is connected to the steam inlet of the steam distributor via a pipeline. The first outlet of the steam distributor is connected to the production unit via a pipeline, and the second outlet of the steam distributor is connected to the steam inlet of the deaerator via a pipeline. The boiler flue gas outlet is connected to the flue gas inlet of the economizer via a pipeline, the economizer flue gas outlet is connected to the flue gas inlet of the gas collecting tank via a pipeline, and the economizer condensate outlet is connected to the water collecting tank via a pipeline. The outlet of the gas collecting tank is connected to the inlet of the first gas distributor via a pipeline. The outlet of the first gas distributor is connected to the inlet of the compressor via a pipeline. The outlet of the compressor is connected to the inlet of the first water distributor via a pipeline. The outlet of the first water distributor is connected to the first inlet of the heat exchanger via a pipeline. The first outlet of the heat exchanger is connected to the inlet of the refrigerated dryer via a pipeline. The outlet of the refrigerated dryer is connected to the main pipe. The main pipe is connected to the spray head inside the gas collecting tank via a return gas pipe. The main pipe is connected to the inlet of the second water distributor via a pipeline. The outlet of the second water distributor is connected to the second inlet of the heat exchanger via a pipeline. The second outlet of the heat exchanger is connected to the first inlet of the third water distributor via a pipeline. The first and second outlets of the third water distributor are both connected to the second gas distributor via pipelines. The top of the third water distributor is provided with the second air inlet of the third water distributor. A filter bowl is provided inside the third water distributor. An inclined ladder and a third baffle are provided below the filter bowl. A drain outlet is provided on the side wall of the third water distributor corresponding to the inclined ladder. The top of the third water distributor is provided with the first air outlet of the third water distributor. The second air outlet of the third water distributor is provided on the side wall of the third water distributor opposite to the drain outlet. The third baffle is installed at a downward angle. There is a sloping ladder on the third baffle. The sloping ladder is horizontal and vertical downward. After the compressed gas is blocked by the third baffle, under the obstruction and influence of the third baffle and the sloping ladder, the carbon dioxide flows down along the third baffle, bypasses the bottom of the third baffle, and enters the second gas cylinder through the pipe and valve.

2. The oxygen-free compressed gas production system of claim 1, wherein, The first water distributor is equipped with a first baffle and a second baffle, which are distributed alternately.

3. The oxygen-free compressed gas production system of claim 1, wherein, The second water distributor includes bearings, blades, nozzles, air inlet pipes, water collection tanks, cylinders, rotating shafts, baffles, air outlet pipes, drain valves, and water pipes. The blades are mounted on the rotating shafts, and the upper and lower ends of the rotating shafts are respectively mounted on the cylinders via bearings. Air inlet pipes and air outlet pipes are arranged opposite each other on the side walls of the cylinders. A nozzle is installed at the end of the air inlet pipe that extends into the cylinder. A baffle is arranged inside the cylinder opposite to the air outlet pipe. The water collection tank is located at the bottom of the cylinder.

4. The oxygen-free compressed gas production system of claim 1, wherein, An air inlet / outlet valve assembly is installed at the top of the third water distributor. The second air inlet and the first air outlet of the third water distributor are both located on the air inlet / outlet valve assembly.

5. The oxygen-free compressed gas production system according to claim 4, characterized in that, The working principle of the intake valve assembly is as follows: When the second intake port of the third water distributor on the intake and exhaust valve assembly is opened, a small amount of compressed gas at a lower temperature enters the top of the third water distributor through the intake and exhaust valve assembly and mixes with the compressed gas with a higher water content. The compressed gas containing water is cooled down, and the water vapor condenses and falls into the bottom of the filter bowl. At this time, the second intake port of the third water distributor is closed, and the first outlet port of the third water distributor is opened. The dry compressed gas with water vapor removed from the upper part of the filter bowl enters the two-part air cylinder through the intake and exhaust valve assembly, the first outlet port of the third water distributor, and the pipeline, and circulates in this manner.

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