Condensate recovery device

Abstract

The invention relates to the technical field of condensate recovery, and provides a condensate recovery device. The device comprises an oxidation tower, a condenser, a booster pump, a stop valve and a reversing valve, the oxidation tower is communicated with a tail gas pipe, and tail gas generated in the oxidation tower is discharged into the tail gas pipe; the reversing valve is provided with two gas inlet ends and a gas outlet end, and the tail gas pipe is communicated with one gas inlet end; the air outlet end of the reversing valve is communicated with the air inlet of the condenser; the stop valve is assembled on the air outlet of the condenser; the other air inlet end of the reversing valve is communicated with the booster pump; tail gas in the oxidation tower passes through the tail gas pipe and is fed into the condenser through the reversing valve, the booster pump pressurizes air and feeds the air into the condenser, the tail gas in the condenser is rapidly cooled and pressurized, and after condensation is completed, the stop valve is opened for exhausting and pressure relief. According to the condensate recovery device, rapid cooling and pressurization can be achieved by introducing high-pressure air into the condenser, and therefore efficient condensate recovery is achieved.

Description

Technical Field

[0001] This invention relates to the field of condensate recovery technology, and in particular to a condensate recovery device. Background Technology

[0002] Currently, the commonly used method for producing phenol and acetone is through the co-production of cumene. The main process steps of cumene co-production can be roughly divided into alkylation, oxidation, concentration, decomposition, and purification, namely: benzene reacts with propylene to produce cumene; cumene reacts with air to produce cumene hydroperoxide; the cumene hydroperoxide solution is concentrated; the concentrated cumene hydroperoxide is decomposed under acidic conditions to produce phenol and acetone; the reaction products are separated and purified to obtain high-purity phenol and acetone products.

[0003] The oxidation process occurs inside the oxidation tower. Since the oxidation reaction is exothermic, the oxidation tower will produce tail gas containing nitrogen, unreacted oxygen, and trace amounts of hydrogen oxide and cumene. This tail gas will be passed into a condenser to condense and recover the entrained water vapor and organic vapor.

[0004] In existing technologies, condensers mainly achieve condensation by cooling, resulting in low condensation recovery efficiency. Summary of the Invention

[0005] The purpose of this invention is to provide a condensate recovery device that can achieve rapid cooling and pressurization by introducing high-pressure air into the condenser, thereby achieving high-efficiency condensate recovery.

[0006] This invention provides a condensate recovery device, comprising:

[0007] An oxidation tower, wherein the oxidation tower is connected to a tail gas pipe, and the tail gas generated in the oxidation tower is discharged into the tail gas pipe;

[0008] A reversing valve, wherein the reversing valve has two air inlets and one air outlet, and the exhaust pipe is connected to one of the air inlets;

[0009] A condenser and a shut-off valve, wherein the outlet of the reversing valve is connected to the inlet of the condenser, and the shut-off valve is mounted on the outlet of the condenser;

[0010] A booster pump, wherein the other air inlet of the reversing valve is connected to the booster pump;

[0011] The exhaust gas in the oxidation tower is sent into the condenser through the exhaust gas pipe and the reversing valve. After the condenser is filled with exhaust gas, the reversing valve connects the condenser and the booster pump. The booster pump pressurizes the air and sends it into the condenser, so that the exhaust gas in the condenser is rapidly cooled and pressurized. After condensation is completed, the shut-off valve opens to exhaust and release pressure.

[0012] Preferably, the condenser includes a condensation chamber and a cooling chamber, the cooling chamber extending through the condensation chamber, cooling water flowing into the cooling chamber, and exhaust gas flowing into the condensation chamber.

[0013] Preferably, the condensing chamber is connected to an inlet pipe, an outlet pipe, and a recovery pipe. The inlet pipe is connected to the outlet end of the reversing valve, the outlet pipe is connected to the shut-off valve, the inlet pipe and the outlet pipe are both connected to the upper part of the condensing chamber, and the recovery pipe is connected to the lower part of the condensing chamber. The condensate is discharged from the condensing chamber through the recovery pipe.

[0014] Preferably, guide plates are evenly distributed in the vertical direction in the condensation chamber, and the guide plates are all inclined.

[0015] Preferably, the condensate recovery device further includes a recovery tank, the upper end of which is provided with an inlet port connected to the recovery pipe, and the condensate discharged from the condensation chamber will be stored in the recovery tank.

[0016] Preferably, the lower end of the recovery tank is provided with a first output port, the first output port is connected to a recovery pump, and the output end of the recovery pump is connected to the oxidation tower.

[0017] Preferably, the condensate recovery device further includes a second condenser, a second reversing valve, and a second shut-off valve. The second condenser, the second reversing valve, and the second shut-off valve are arranged in parallel with the condenser, the reversing valve, and the shut-off valve, and the assembly and connection relationship of the second condenser, the second reversing valve, and the second shut-off valve is the same as that of the condenser, the reversing valve, and the shut-off valve.

[0018] Preferably, the condensate recovery device further includes a selection valve, which has an input end connected to the exhaust pipe and two output ends connected to the parallel reversing valve and the second reversing valve, respectively.

[0019] Preferably, the booster pump is connected to both the reversing valve and the second reversing valve, and the booster pump is connected to at most one of the condenser and the second condenser at the same time.

[0020] Preferably, both the directional valve and the shut-off valve are electrically controlled valves.

[0021] The technical solution of this invention recovers condensate from exhaust gas using a condenser. High-pressure air is introduced into the condenser through a reversing valve from the same pipeline to reduce the residue of exhaust gas in the pipeline and ensure that the condensate condenses in the condenser. After the high-pressure air enters the condenser, it mixes with the exhaust gas to rapidly reduce the temperature of the exhaust gas. At the same time, the high-pressure air increases the air pressure in the condenser, raising the freezing point of the substances and thus accelerating the condensation rate of the exhaust gas, achieving high-efficiency recovery of condensate. Attached Figure Description

[0022] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0023] Figure 1 This is an assembly diagram of a first embodiment of a condensate recovery device according to the present invention;

[0024] Figure 2 for Figure 1 A front view of a condenser in a condensate recovery device;

[0025] Figure 3 for Figure 1 A cross-sectional view of a condenser in a condensate recovery device;

[0026] Figure 4 for Figure 1 A cross-sectional view of a recovery tank in a condensate recovery device;

[0027] Figure 5 This is an assembly diagram of a second embodiment of a condensate recovery device according to the present invention.

[0028] Explanation of reference numerals in the attached figures:

[0029] 1. Oxidation tower; 11. Tail gas pipe; 2. Condenser; 21. Condensation chamber; 211. Inlet pipe; 212. Outlet pipe; 213. Recovery pipe; 214. Guide plate; 22. Cooling chamber; 3. Booster pump; 4. Reversing valve; 5. Shut-off valve; 6. Selector valve; 7. Recovery tank; 71. Input port; 72. First output port; 73. Second output port; 74. Recovery pump;

[0030] 2-2, Second condenser; 4-2, Second reversing valve; 5-2, Second shut-off valve. Detailed Implementation

[0031] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0033] In the description of this invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified. Furthermore, the terms "installed," "connected," and "linked" should be interpreted broadly; for example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0034] First embodiment:

[0035] Combination Figures 1 to 4 As shown, the condensate recovery device provided by the present invention includes an oxidation tower 1, a condenser 2, a booster pump 3, a reversing valve 4, and a shut-off valve 5.

[0036] Combination Figures 1 to 4 As shown, oxidation tower 1 is a reaction vessel for the reaction of cumene with air to produce cumene hydrogen peroxide. Since the oxidation reaction is exothermic, some of the solution will vaporize into gas, which, together with the air consumed in the reaction, will mix to form tail gas. Oxidation tower 1 is equipped with a tail gas pipe 11, and the tail gas pipe 11 is connected to the inside of oxidation tower 1. The tail gas generated in oxidation tower 1 will be discharged into tail gas pipe 11, and the tail gas will be discharged from oxidation tower 1 through tail gas pipe 11.

[0037] The reversing valve 4 has two inlet ends and one outlet end. The two inlet ends of the reversing valve 4 are connected to the exhaust pipe 11 and the booster pump 3, respectively. The outlet end of the reversing valve 4 is connected to the condenser 2. The reversing valve 4 can choose to connect the exhaust pipe 11 or the booster pump 3 to the condenser 2.

[0038] The booster pump 3 can collect outside air and compress it, finally outputting high-pressure air. When the reversing valve 4 connects the booster pump 3 and the condenser 2, the booster pump 3 can deliver high-pressure air into the condenser 2.

[0039] Condenser 2 is a device that condenses exhaust gas to produce condensate. The shut-off valve 5 is installed on the outlet of condenser 2. When the booster pump 3 delivers high-pressure air into condenser 2, the shut-off valve 5 closes to prevent gas from leaking out of condenser 2 and to ensure the stability of the pressurization process.

[0040] In this embodiment, combined with Figure 2 , Figure 3 As shown, the condenser 2 includes a condensing chamber 21 and a cooling chamber 22. The condensing chamber 21 is the space where the condensation process occurs, and exhaust gas is introduced into it. The cooling chamber 22 is the space that provides low-temperature heat transfer, and cooling water is introduced into it. The cooling chamber 22 is composed of cooling pipes, which penetrate the condensing chamber 21 to increase the contact area between the two chambers and improve heat transfer efficiency. The condenser 2 is equipped with an inlet pipe 211, an outlet pipe 212, and a recovery pipe 213, all connected to the condensing chamber 21. The inlet pipe 211 connects to the outlet of the reversing valve 4 to introduce exhaust gas or high-pressure air; the outlet pipe 212 is used for exhausting gas and connects to the shut-off valve 5; the condensate is discharged from the condensing chamber 21 through the recovery pipe 213. Both the inlet pipe 211 and the outlet pipe 212 connect to the upper part of the internal space of the condensing chamber 21 to prevent condensate from entering the inlet pipe 211 or the outlet pipe 212, reducing the impact on the liquid level during pressurization and depressurization. The recovery pipe 213 connects to the bottom of the condensation chamber 21, ensuring that all condensate can be discharged through the recovery pipe 213.

[0041] In this embodiment, combined with Figure 3 As shown, the condenser chamber 21 is provided with uniformly distributed guide plates 214 along the vertical direction, and the guide plates 214 are all inclined. The guide plates 214 can reduce the falling distance of the condensate, so that the condensate can quickly gather into a water flow and quickly gather to the bottom of the condenser chamber 21. The inclined arrangement of the guide plates 214 is to improve its effect of guiding the flow direction of the water and reduce the water flow staying on the guide plates 214.

[0042] In this embodiment, combined with Figure 1 , Figure 4As shown, the recovery tank 7 is a container for storing condensate. The collected condensate is generally not directly sent back to the oxidation tower 1 for recycling because it contains a significant amount of water. Therefore, the recovery tank 7 is usually equipped with an oil-water separation mechanism to separate the water and organic solvents in the condensate. Finally, the collected organic solvents are transported back to the oxidation tower 1 for recycling via the recovery pump 74. The installation of an oil-water separation mechanism within the recovery tank 7 and the provision of two output ports to output solutions of different compositions are common techniques in this field and will not be described in detail here.

[0043] The upper end of the recovery tank 7 is equipped with an inlet port 71 connected to the recovery pipe 213. The condensate discharged from the condensation chamber 21 will be stored in the recovery tank 7. A valve is installed on the inlet port 71 to control its connection status. When the condenser 2 is pressurized, the inlet port 71 is cut off to prevent high-pressure air from entering the recovery tank 7. The lower end of the recovery tank 7 is equipped with a first outlet port 72 and a second outlet port 73. The first outlet port 72 is connected to a recovery pump 74, and the output end of the recovery pump 74 is connected to the oxidation tower 1. The organic solution is discharged through the first outlet port 72 and transported to the oxidation tower 1 by the recovery pump 74. Since the main component of the organic matter is cumene, the height of the first outlet port 72 in the recovery tank 7 is higher than that of the second outlet port 73.

[0044] In this embodiment, both the directional valve 4 and the shut-off valve 5 are electrically controlled valves. The opening and closing states of different valves can be quickly controlled by professional PLC equipment, which facilitates the realization of automated production processes.

[0045] Working process: The reversing valve 4 connects the tail gas pipe 11 and the condenser 2. The tail gas in the oxidation tower 1 enters the condenser 2 through the tail gas pipe 11 and fills the condenser 2. At this time, the shut-off valve 5 is in the closed state. Then, the reversing valve 4 connects the condenser 2 and the booster pump 3. The booster pump 3 outputs high-pressure air into the condenser 2. The tail gas remaining in the pipe between the reversing valve 4 and the condenser 2 is also simultaneously pressed into the condenser 2. The high-pressure air and tail gas mix, and the temperature of the tail gas drops rapidly. At the same time, the high-pressure environment and the cooling chamber 22 cool the condensing chamber 21. The tail gas condenses rapidly to produce condensate, which collects at the bottom of the condensing chamber 21. After condensation, the booster pump 3 stops working, the shut-off valve 5 opens to release the gas, and after the gas is released, the shut-off valve 5 closes again. At the same time, the reversing valve 4 connects the tail gas pipe 11 and the condenser 2 again to start the next cycle.

[0046] After a certain amount of condensate accumulates in the condenser chamber 21, the valve at the inlet 71 is opened after the venting of this cycle is completed, transferring the condensate to the recovery tank 7. After the condensate transfer is completed, the reversing valve 4 reconnects the exhaust pipe 11 and the condenser 2 to start the next cycle.

[0047] In this embodiment, the exhaust gas is condensed and recovered by the condenser 2. High-pressure air is introduced into the condenser 2 through the reversing valve 4 from the same pipeline to reduce the residue of exhaust gas in the pipeline and ensure that the condensate condenses in the condenser 2. After the high-pressure air enters the condenser 2, it mixes with the exhaust gas to quickly reduce the temperature of the exhaust gas. At the same time, the high-pressure air will increase the air pressure in the condenser 2, which will raise the freezing point of the substance, thereby accelerating the condensation rate of the exhaust gas and achieving high-efficiency recovery of condensate.

[0048] Second embodiment:

[0049] In this embodiment, combined with Figure 5 As shown, a new selector valve 6, a second condenser 2-2, a second reversing valve 4-2, and a second shut-off valve 5-2 have been added. The second condenser 2-2, the second reversing valve 4-2, and the second shut-off valve 5-2 are arranged side by side with the condenser 2, the reversing valve 4, and the shut-off valve 5, and the assembly and connection relationship of the second condenser 2-2, the second reversing valve 4-2, and the second shut-off valve 5-2 is the same as that of the condenser 2, the reversing valve 4, and the shut-off valve 5.

[0050] This ultimately forms a first pathway consisting of oxidation tower 1, tail gas pipe 11, selector valve 6, reversing valve 4, condenser 2, and booster pump 3, and a second pathway consisting of oxidation tower 1, tail gas pipe 11, selector valve 6, second reversing valve 4-2, second condenser 2-2, and booster pump 3. Selector valve 6 has one input end connected to tail gas pipe 11 and two output ends connected to the parallel reversing valve 4 and second reversing valve 4-2 respectively. Booster pump 3 is simultaneously connected to both reversing valve 4 and reversing valve 4-2, but can only be connected to one of the condensers 2 and condenser 2-2 at a time. Recovery tanks 7 can be used either together or independently. When using one together, separate valves are needed to control the connection between recovery tank 7 and condensers 2 and condenser 2-2. The diagram shows an example of recovery tank 7 being used independently.

[0051] By setting up two pathways and switching between them, the oxidation tower 1 can continuously output exhaust gas through the exhaust pipe 11, improving the matching of working efficiency between different working devices. In this embodiment, only two pathways are used as an example, but more pathways can be added according to the actual situation.

[0052] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A condensate recovery device, characterized in that, include: An oxidation tower (1) is connected to a tail gas pipe (11), and the tail gas generated in the oxidation tower (1) is discharged into the tail gas pipe (11). The reversing valve (4) has two inlet ends and one outlet end, and the tailpipe (11) is connected to one of the inlet ends; The condenser (2) and the shut-off valve (5) are connected to the air inlet of the condenser (2) at the outlet of the reversing valve (4), and the shut-off valve (5) is mounted on the air outlet of the condenser (2). The booster pump (3) is connected to the other air inlet of the reversing valve (4); The tail gas in the oxidation tower (1) is sent into the condenser (2) through the tail gas pipe (11) and the reversing valve (4). After the condenser (2) is filled with tail gas, the reversing valve (4) connects the condenser (2) and the booster pump (3). The booster pump (3) pressurizes the air and sends it into the condenser (2), so that the tail gas in the condenser (2) is rapidly cooled and pressurized. After condensation is completed, the shut-off valve (5) is opened to exhaust and release pressure.

2. The condensate recovery device according to claim 1, characterized in that, The condenser (2) includes a condensing chamber (21) and a cooling chamber (22). The cooling chamber (22) extends through the condensing chamber (21). Cooling water is introduced into the cooling chamber (22), and exhaust gas is introduced into the condensing chamber (21).

3. The condensate recovery device according to claim 2, characterized in that, The condenser (21) is connected to an inlet pipe (211), an outlet pipe (212), and a recovery pipe (213). The inlet pipe (211) is connected to the outlet end of the reversing valve (4), and the outlet pipe (212) is connected to the shut-off valve (5). The inlet pipe (211) and the outlet pipe (212) are both connected to the top of the condenser (21), and the recovery pipe (213) is connected to the bottom of the condenser (21). The condensate is discharged from the condenser (21) through the recovery pipe (213).

4. The condensate recovery device according to claim 2, characterized in that, The condensation chamber (21) has guide plates (214) evenly distributed along the vertical direction, and the guide plates (214) are all inclined.

5. The condensate recovery device according to claim 2, characterized in that, It also includes a recycling tank (7), the upper end of which is provided with an inlet (71) connected to the recycling pipe (213), and the condensate discharged from the condensation chamber (21) will be stored in the recycling tank (7).

6. The condensate recovery device according to claim 5, characterized in that, The lower end of the recovery tank (7) is provided with a first output port (72), and the first output port (72) is connected to a recovery pump (74). The output end of the recovery pump (74) is connected to the oxidation tower (1).

7. The condensate recovery device according to claim 1, characterized in that, It also includes a second condenser (2-2), a second reversing valve (4-2), and a second shut-off valve (5-2). The second condenser (2-2), the second reversing valve (4-2), and the second shut-off valve (5-2) are arranged side by side with the condenser (2), the reversing valve (4), and the shut-off valve (5). The assembly and connection relationship of the second condenser (2-2), the second reversing valve (4-2), and the second shut-off valve (5-2) is the same as that of the condenser (2), the reversing valve (4), and the shut-off valve (5).

8. The condensate recovery device according to claim 7, characterized in that, It also includes a selector valve (6), which has an input end connected to the exhaust pipe (11) and two output ends connected to the parallel reversing valve (4) and the second reversing valve (4-2).

9. The condensate recovery device according to claim 7, characterized in that, The booster pump (3) is simultaneously connected to the reversing valve (4) and the second reversing valve (4-2), and the booster pump (3) is simultaneously connected to at most one of the condenser (2) and the second condenser (2-2).

10. The condensate recovery device according to claim 1, characterized in that, Both the reversing valve (4) and the shut-off valve (5) are electrically controlled valves.

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