Oxidized tail gas treatment system of hydrogen peroxide device

Abstract

The utility model relates to the field of chemical production, and discloses an oxidized tail gas treatment system of a hydrogen peroxide device, which is characterized in that the tail end of a tail gas inlet pipe is connected with a tail gas inlet branch pipe, the tail gas inlet branch pipe is connected with a bottom inlet of an adsorption tank, an inlet valve is arranged on the tail gas inlet branch pipe, a top outlet of the adsorption tank is connected with a gas outlet branch pipe, and a gas outlet valve is arranged on the gas outlet branch pipe; the tail end of the air outlet branch pipe is connected with an air outlet header pipe; a top inlet and a bottom outlet of the adsorption tank are respectively connected with a steam inlet branch pipe and a steam outlet branch pipe, the steam inlet branch pipe is connected with a steam inlet pipe, and the steam outlet branch pipe is connected with a steam outlet pipe; the top inlet of the adsorption tank is connected with a nitrogen pressure equalizing branch pipe; the nitrogen pressure equalizing branch pipe is connected with the nitrogen pressure equalizing pipe; an upper inlet of the adsorption tank is connected with a pure water branch pipe which is connected with a pure water pipe. According to the system, the safe production of the system is ensured while the standard emission of tail gas is realized.

Description

Technical Field

[0001] The utility model relates to the technical field of chemical production, in particular to the field of tail gas treatment, and specifically to a tail gas treatment system for oxidation of a hydrogen peroxide device. Background Art

[0002] Hydrogen peroxide is an important chemical product that can be used as a raw material for the production of caprolactam and propylene oxide. It can also be used as an oxidant for sewage treatment. It is widely used in the chemical, medical, environmental protection, textile and other industries.

[0003] The anthraquinone process is commonly used in hydrogen peroxide production. Using alkyl anthraquinone as a carrier, trioctyl sulfate, and heavy aromatics as solvents, the process employs palladium-catalyzed fixed-bed hydrogenation, followed by hydrogenation liquid empty column oxidation, sieve-plate column extraction, and post-treatment with a circulating working fluid. This process produces tail gas containing heavy aromatics, primarily C9 and C10, with a concentration of approximately 10-12 g / Nm³. This not only pollutes the environment but also wastes resources. Cost-effective solvent recovery and recycling can reduce production costs and generate economic benefits while also minimizing environmental pollution, making it a crucial step in clean production.

[0004] In the existing technology, activated carbon is used for adsorption and recycling of aromatic hydrocarbons. However, since the flash point of aromatic hydrocarbons is 42°C, the temperature during steam desorption is higher than the flash point. If the temperature is not properly controlled, aromatic hydrocarbons can easily flash or smolder, resulting in safety accidents. Therefore, a hydrogen peroxide device oxidation tail gas treatment system is needed to ensure that the oxidation tail gas treatment operation in hydrogen peroxide production is stable, efficient, safe and reliable. Summary of the Invention

[0005] The utility model provides a hydrogen peroxide device oxidation tail gas treatment system to solve a series of problems such as heavy aromatic hydrocarbons contained in hydrogen peroxide tail gas, which are prone to flash combustion or smoldering of aromatic hydrocarbons during activated carbon adsorption recovery, resulting in safety accidents.

[0006] The utility model is implemented by the following technical solutions:

[0007] The exhaust gas treatment system of the oxidation of hydrogen peroxide device comprises an exhaust gas inlet pipe, the end of the exhaust gas inlet pipe is connected to the exhaust gas inlet branch pipe, the exhaust gas inlet branch pipe is connected to the bottom inlet of an adsorption tank, an exhaust gas inlet branch pipe is provided with an air inlet valve, the top outlet of the adsorption tank is connected to the exhaust branch pipe, the exhaust branch pipe is provided with an exhaust valve, and the end of the exhaust branch pipe is connected to an exhaust main pipe connected to the air; the top inlet and the bottom outlet of the adsorption tank are respectively connected to a steam inlet branch pipe and a steam outlet branch pipe, the steam inlet branch pipe is installed with a steam inlet valve, the steam outlet branch pipe is installed with a steam outlet valve, the steam inlet branch pipe is connected to the steam inlet pipe, the steam outlet pipe is connected to the steam outlet pipe, and the steam outlet pipe is connected to a vacuum pump; the top inlet of the adsorption tank is connected to a nitrogen equalizing pressure branch pipe installed with a nitrogen equalizing pressure valve, and the nitrogen equalizing pressure branch pipe is connected to the nitrogen equalizing pressure pipe; the upper inlet of the adsorption tank is connected to a pure water branch pipe installed with a pure water valve, and the pure water branch pipe is connected to the pure water pipe.

[0008] During implementation, it includes a tail gas intake pipe, on which a flame arrester is installed. The tail gas intake pipe is located at the rear section of the flame arrester and is provided with an air branch pipe through a three-way valve, and the end of the air branch pipe is connected to the outlet main pipe; the end of the tail gas intake pipe is connected to the tail gas intake branch pipe, and the tail gas intake branch pipe is connected to the bottom inlet of the adsorption tank, and there are multiple adsorption tanks; an air intake valve is provided on the tail gas intake branch pipe, and the top outlet of the adsorption tank is connected to the outlet branch pipe, and an air outlet valve is provided on the outlet branch pipe, and the end of the outlet branch pipe is connected to the outlet main pipe connected to the air.

[0009] The top inlet and bottom outlet of the adsorption tank are respectively connected to the steam inlet branch pipe and the steam outlet branch pipe, the steam inlet branch pipe is installed with a steam inlet valve, the steam outlet branch pipe is installed with a steam outlet valve, the steam inlet branch pipe is connected to the steam inlet pipe, the steam outlet branch pipe is connected to the steam outlet pipe, and the steam outlet pipe is connected to a vacuum pump.

[0010] The top inlet of the adsorption tank is connected to a nitrogen equalizing pressure branch pipe with a nitrogen equalizing pressure valve installed. The nitrogen equalizing pressure branch pipe is connected to a nitrogen equalizing pressure pipe. The nitrogen equalizing pressure pipe is connected to 0.5 bar low-pressure nitrogen to prevent flash combustion of organic matter under the high-temperature bed.

[0011] The upper inlet of the adsorption tank is connected to a pure water branch pipe with a pure water valve installed, and the pure water branch pipe is connected to the pure water pipe.

[0012] The upper inlet of each adsorption tank is connected to a pure water pipe installed with a pure water valve.

[0013] During use, the oxygen content in the exhaust gas is detected. The exhaust gas from the hydrogen peroxide production system passes through the flame arrester and then enters the three-way valve. When the oxygen content is greater than 9%, it is directly discharged through the air branch pipe. When the oxygen content is ≤9%, the air inlet valve and the air outlet valve are opened, and the exhaust gas enters the exhaust gas inlet branch pipe through the exhaust gas inlet pipe and then enters the adsorption tank through the air inlet valve. In the adsorption tank, the exhaust gas passes through the activated carbon bed layer, and the organic solvent in the exhaust gas is adsorbed. The exhaust gas enters the exhaust branch pipe from the top outlet, and the exhaust gas that meets the standards is collected in the exhaust main pipe for discharge.

[0014] When the activated carbon in an adsorption tank is saturated with adsorption, close the air inlet valve and air outlet valve of the adsorption tank, open the steam inlet valve and steam outlet valve of the adsorption tank, start the vacuum pump, and reversely introduce steam into the adsorption tank to desorb the activated carbon under negative pressure and recover the organic solvent; at the same time, open the air inlet valve and air outlet valve of other adsorption tanks to adsorb the tail gas.

[0015] When desorption is completed, close the steam inlet valve and steam outlet valve, open the nitrogen pressure equalizing valve, and introduce 0.5 bar low-pressure nitrogen from the nitrogen pressure equalizing branch pipe on the top of the adsorption tank to perform pressure equalization operation on the adsorption tank so that the adsorption tank is at normal pressure.

[0016] After the pressure equalization is completed, the outlet valve and steam outlet valve are opened, the nitrogen pressure equalization valve is closed, and the vacuum pump is started to cool and dry the activated carbon bed to achieve the reuse of the activated carbon. Multiple adsorption tanks are rotated for desorption, pressure equalization, and drying.

[0017] In particular, if the temperature of the adsorption tank rises abnormally during the process, the nitrogen equalizing valve or pure water valve is interlocked or manually opened to asphyxiate and cool the adsorption tank. At the same time, the three-way valve is closed, and the unit is interlocked and cut out to be vented directly to ensure the safe operation of the system.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] The utility model provides a hydrogen peroxide device oxidation tail gas treatment system, which uses activated carbon to adsorb, desorb, equalize the pressure, and dry the volatile solvent in the tail gas, thereby realizing solvent recovery and reuse and activated carbon reuse. During operation, by setting tail gas oxygen content interlock, nitrogen equalization protection, high-temperature spraying pure water cooling and other safety measures and methods, the tail gas can be discharged in compliance with the standards while ensuring the safe production of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram showing the overall structure of the present invention.

[0021] In the figure: 1-flame arrester, 2-adsorption tank, 21-adsorption tank A, 22-adsorption tank B, 23-adsorption tank C;

[0022] L1-exhaust gas intake pipe, L2-air branch pipe,

[0023] L3- exhaust gas intake branch pipe, L31- exhaust gas intake branch pipe of tank A, L32- exhaust gas intake branch pipe of tank B, L33- exhaust gas intake branch pipe of tank C,

[0024] L4- outlet pipe, L41- outlet pipe of tank A, L42- outlet pipe of tank B, L43- outlet pipe of tank C,

[0025] L5- exhaust manifold,

[0026] L6-steam inlet pipe,

[0027] L7-steam intake branch pipe, L71-A tank steam intake branch pipe, L72-B tank steam intake branch pipe, L73-C tank steam intake branch pipe,

[0028] L8-steam outlet branch pipe, L81-steam outlet branch pipe of tank A, L82-steam outlet branch pipe of tank B, L83-steam outlet branch pipe of tank C, L9-steam outlet pipe, L10-nitrogen equalizing pressure pipe, L11-nitrogen equalizing pressure pipe, L111-nitrogen equalizing pressure pipe of tank A, L112-nitrogen equalizing pressure pipe of tank B, L113-nitrogen equalizing pressure pipe of tank C, L14-pure water pipe, L15-pure water pipe;

[0029] K1-pure water valve, K2-three-way valve, K3-inlet valve, K31-A tank inlet valve, K32-B tank inlet valve, K33-C tank inlet valve,

[0030] K4- outlet valve, K41-A tank outlet valve, K42-B tank outlet valve, K44-C tank outlet valve,

[0031] K7-steam intake valve, K71-A tank steam intake valve, K72-B tank steam intake valve, K73-C tank steam intake valve,

[0032] K8-steam outlet valve, K81-A tank steam outlet valve, K82-B tank steam outlet valve, K83-C tank steam outlet valve,

[0033] K11-Nitrogen pressure equalizing valve, K111-A tank nitrogen pressure equalizing valve, K112-B tank nitrogen pressure equalizing valve, K113-C tank nitrogen pressure equalizing valve. DETAILED DESCRIPTION

[0034] The specific embodiments of the present invention will be described below with reference to the accompanying drawings.

[0035] A hydrogen peroxide device oxidation tail gas treatment system, such as Figure 1 As shown:

[0036] During implementation, it includes an exhaust gas intake pipe L1, on which a flame arrester 1 is installed. The exhaust gas intake pipe L1 is located at the rear section of the flame arrester 1 and is provided with an air branch pipe L2 through a three-way valve K2. The end of the air branch pipe L2 is connected to the exhaust main pipe L5; the end of the exhaust gas intake pipe L1 is connected to three exhaust gas intake branch pipes L3, namely, the exhaust gas intake branch pipe L31 of tank A, the exhaust gas intake branch pipe L32 of tank B, and the exhaust gas intake branch pipe L33 of tank C. Each exhaust gas intake branch pipe L3 is connected to the bottom inlet of its own adsorption tank 2. In this embodiment, there are three adsorption tanks 2, including an adsorption tank A 21, an adsorption tank B 22, and an adsorption tank C 23; the bottom inlet of the adsorption tank A 21 is connected to the exhaust gas inlet of the tank A equipped with the tank A intake valve K31. The air branch pipe L31 is connected, and the top outlet of the adsorption tank A 21 is connected to the A tank outlet branch pipe L41 equipped with the A tank outlet valve K41; similarly, the bottom inlet of the adsorption tank B 22 is connected to the B tank tail gas inlet branch pipe L32 equipped with the B tank inlet valve K32, and the top outlet of the adsorption tank B 22 is connected to the B tank outlet branch pipe L42 equipped with the B tank outlet valve K42; the bottom inlet of the adsorption tank C 23 is connected to the C tank tail gas inlet branch pipe L33 equipped with the C tank inlet valve K33, and the top outlet of the adsorption tank C 23 is connected to the C tank outlet branch pipe L43 equipped with the C tank outlet valve K43; the ends of the A tank outlet branch pipe L41, the B tank outlet branch pipe L42, and the C tank outlet branch pipe L43 converge and are connected to the outlet main pipe L5.

[0037] The top inlet and bottom outlet of the adsorption tank 2 are respectively connected to the steam inlet branch pipe L7 and the steam outlet branch pipe L8. The steam inlet valve K7 is installed on the steam inlet branch pipe L7, and the steam outlet valve K8 is installed on the steam outlet branch pipe L8. Specifically, the top inlet of the adsorption tank A 21 is connected to the steam inlet branch pipe L71 of the tank A equipped with the steam inlet valve K71 of the tank A, and the bottom outlet of the adsorption tank A 21 is connected to the steam outlet branch pipe L81 of the tank A equipped with the steam outlet valve K81 of the tank A; similarly, the top inlet of the adsorption tank B 22 is connected to the steam inlet branch pipe L72 of the tank B equipped with the steam inlet valve K72 of the tank B, and the bottom outlet of the adsorption tank B 22 is connected to the steam inlet branch pipe L72 of the tank B equipped with the steam inlet valve K72 of the tank B, It is connected to the steam outlet branch pipe L82 of tank B which is equipped with the steam outlet valve K82 of tank B; the top inlet of the adsorption tank C 23 is connected to the steam outlet branch pipe L73 of tank C which is equipped with the steam inlet valve K73 of tank C, and the bottom outlet of the adsorption tank C 23 is connected to the steam outlet branch pipe L83 of tank C which is equipped with the steam outlet valve K83 of tank C; the steam inlet branch pipe L71 of tank A, the steam inlet branch pipe L72 of tank B, and the steam inlet branch pipe L73 of tank C are connected to the steam inlet pipe L6, and the steam outlet branch pipe L81 of tank A, the steam outlet branch pipe L82 of tank B, and the steam outlet branch pipe L83 of tank C are merged and connected to the steam outlet pipe L9, and the steam outlet pipe L9 is connected to a vacuum pump.

[0038] The top inlet of the adsorption tank 2 is connected to the nitrogen equalizing pressure branch pipe L11 installed with the nitrogen equalizing pressure valve K11, and the top inlet of the adsorption tank A 21 is connected to the nitrogen equalizing pressure branch pipe L111 of the tank A installed with the nitrogen equalizing pressure valve K111 of the tank A; similarly, the top inlet of the adsorption tank B 22 is connected to the nitrogen equalizing pressure branch pipe L112 of the tank B installed with the nitrogen equalizing pressure valve K112 of the tank B; the top inlet of the adsorption tank C 23 is connected to the nitrogen equalizing pressure branch pipe L113 of the tank C installed with the nitrogen equalizing pressure valve K113 of the tank C.

[0039] The nitrogen equalizing pressure branch pipe L111 of tank A, the nitrogen equalizing pressure branch pipe L112 of tank B, and the nitrogen equalizing pressure branch pipe L113 of tank C are converged and connected to the nitrogen equalizing pressure pipe L10, and the nitrogen equalizing pressure pipe L10 is connected to 0.5 bar low-pressure nitrogen.

[0040] The upper inlet of each adsorption tank 2 is connected to a pure water branch pipe L15 installed with a pure water valve K1, and the pure water branch pipe L15 is connected to the pure water pipe L14.

[0041] During use, the oxygen content in the tail gas is detected. The tail gas of the hydrogen peroxide production system enters the three-way valve K2 after passing through the flame arrester 1. When the oxygen content is greater than 9%, it is directly discharged through the empty branch pipe L2.

[0042] When the oxygen content is ≤9%, open the A tank air inlet valve K31 and the A tank air outlet valve K41, and the exhaust gas enters the A tank through the exhaust gas inlet pipe L1 and the exhaust gas inlet branch L31 through the A tank air inlet valve K31 and enters the adsorption A tank 21. In the adsorption tank A 21, the exhaust gas passes through the activated carbon bed, and the organic solvent in the exhaust gas is adsorbed. It enters the A tank air outlet branch L41 from the top outlet, and the exhaust gas that meets the standards is collected in the exhaust main pipe L5 for discharge.

[0043] When the activated carbon in the adsorption tank A 21 is saturated with adsorption, close the tank A air inlet valve K31 and the tank A air outlet valve K41, open the tank A steam air inlet valve K71 and the tank A steam outlet valve K81, start the vacuum pump, and reversely introduce steam into the adsorption tank A 21 to desorb the activated carbon under negative pressure and recover the organic solvent; at the same time, open the tank B air inlet valve K32 and the tank B air outlet valve K42 of the adsorption tank B 22, and adsorb the exhaust gas in the same way.

[0044] Similarly, when the activated carbon in the adsorption tank B 22 is saturated with adsorption, the dosage form in the adsorption tank B 22 is desorbed to recover the organic solvent. At this time, the adsorption tank C 23 is used to adsorb the organic solvent in the tail gas.

[0045] When the desorption of adsorption tank A 21 is completed, close the steam inlet valve K71 and the steam outlet valve K81 of tank A, open the nitrogen equalizing valve K111 of tank A, and introduce 0.5 bar low-pressure nitrogen from the nitrogen equalizing branch pipe L111 at the top of adsorption tank A 21 to perform pressure equalization operation on adsorption tank A, so that adsorption tank A is in a normal pressure state.

[0046] After the pressure equalization is completed, open the A tank outlet valve K41 and the A tank steam outlet valve K81, close the A tank nitrogen equalizing valve K111, start the vacuum pump, cool and dry the activated carbon bed, realize the reuse of activated carbon, and enter the next cycle. Multiple adsorption tanks take turns to desorb, equalize the pressure, and dry.

[0047] The scope of protection claimed by the present invention is not limited to the above specific embodiments. For those skilled in the art, the present invention may have various deformations and changes. Any modifications, improvements and equivalent substitutions made within the concept and principle of the present invention should be included in the scope of protection of the present invention.

Claims

1. A hydrogen peroxide device oxidation tail gas treatment system, characterized by: The exhaust gas inlet pipe (L1) comprises an exhaust gas inlet pipe (L1), the end of the exhaust gas inlet pipe (L1) is connected to an exhaust gas inlet branch pipe (L3), the exhaust gas inlet branch pipe (L3) is connected to the bottom inlet of the adsorption tank (2), an inlet valve (K3) is provided on the exhaust gas inlet branch pipe (L3), the top outlet of the adsorption tank (2) is connected to an outlet branch pipe (L4), an outlet valve (K4) is provided on the outlet branch pipe (L4), and the end of the outlet branch pipe (L4) is connected to an air outlet main pipe (L5); The top inlet and the bottom outlet of the adsorption tank (2) are respectively connected to a steam inlet branch pipe (L7) and a steam outlet branch pipe (L8); a steam inlet valve (K7) is installed on the steam inlet branch pipe (L7); a steam outlet valve (K8) is installed on the steam outlet branch pipe (L8); the steam inlet branch pipe (L7) is connected to the steam inlet pipe (L6); the steam outlet branch pipe (L8) is connected to the steam outlet pipe (L9); and the steam outlet pipe (L9) is connected to a vacuum pump; The top inlet of the adsorption tank (2) is connected to a nitrogen equalizing pressure branch pipe (L11) equipped with a nitrogen equalizing pressure valve (K11), and the nitrogen equalizing pressure branch pipe (L11) is connected to the nitrogen equalizing pressure pipe (L10); The upper inlet of the adsorption tank (2) is connected to a pure water branch pipe (L15) equipped with a pure water valve (K1), and the pure water branch pipe (L15) is connected to a pure water pipe (L14).

2. A hydrogen peroxide device oxidation tail gas treatment system according to claim 1, characterized in that: A flame arrester (1) is installed on the tail gas intake pipe (L1). The tail gas intake pipe (L1) is located at the rear section of the flame arrester (1) and is provided with an air connection branch pipe (L2) through a three-way valve (K2). The end of the air connection branch pipe (L2) is connected to the main gas outlet pipe (L5).

3. A hydrogen peroxide device oxidation tail gas treatment system according to claim 1, characterized in that: There are multiple adsorption tanks (2).

4. A hydrogen peroxide device oxidation tail gas treatment system according to claim 3, characterized in that: The upper inlet of each adsorption tank (2) is connected to a pure water pipe (L14) equipped with a pure water valve (K1).

5. The hydrogen peroxide device oxidation tail gas treatment system according to claim 1, characterized in that: The adsorption tank (2) includes an adsorption tank A (21), an adsorption tank B (22), and an adsorption tank C (23); The bottom inlet of the adsorption tank A (21) is connected to the A tank tail gas inlet branch pipe (L31) equipped with the A tank inlet valve (K31), and the top outlet of the adsorption tank A (21) is connected to the A tank outlet branch pipe (L41) equipped with the A tank outlet valve (K41); The top inlet of the adsorption tank A (21) is connected to the tank A steam inlet branch pipe (L71) equipped with the tank A steam inlet valve (K71), and the bottom outlet of the adsorption tank A (21) is connected to the tank A steam outlet branch pipe (L81) equipped with the tank A steam outlet valve (K81); The top inlet of the adsorption tank A (21) is connected to the tank A nitrogen equalizing pressure branch pipe (L111) equipped with the tank A nitrogen equalizing pressure valve (K111); The bottom inlet of the adsorption tank B (22) is connected to the tank B tail gas inlet branch pipe (L32) equipped with the tank B inlet valve (K32), and the top outlet of the adsorption tank B (22) is connected to the tank B outlet branch pipe (L42) equipped with the tank B outlet valve (K42); The top inlet of the adsorption tank B (22) is connected to the tank B steam inlet branch pipe (L72) equipped with the tank B steam inlet valve (K72), and the bottom outlet of the adsorption tank B (22) is connected to the tank B steam outlet branch pipe (L82) equipped with the tank B steam outlet valve (K82); The top inlet of the adsorption tank B (22) is connected to the tank B nitrogen equalizing pressure branch pipe (L112) equipped with the tank B nitrogen equalizing pressure valve (K112); The bottom inlet of the adsorption tank C (23) is connected to a tank C tail gas inlet branch pipe (L33) equipped with a tank C inlet valve (K33), and the top outlet of the adsorption tank C (23) is connected to a tank C outlet branch pipe (L43) equipped with a tank C outlet valve (K43); The top inlet of the adsorption tank C (23) is connected to a tank C steam inlet branch pipe (L73) equipped with a tank C steam inlet valve (K73), and the bottom outlet of the adsorption tank C (23) is connected to a tank C steam outlet branch pipe (L83) equipped with a tank C steam outlet valve (K83); The top inlet of the adsorption tank C (23) is connected to the tank C nitrogen equalizing pressure branch pipe (L113) equipped with the tank C nitrogen equalizing pressure valve (K113).

6. A hydrogen peroxide device oxidation tail gas treatment system according to claim 1, characterized in that: The nitrogen equalizing pressure pipe (L10) is connected to 0.5 bar low-pressure nitrogen.

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