Hydrogen peroxide production oxidation tail gas energy recovery device

Abstract

The utility model discloses a hydrogen peroxide production oxidation tail gas energy recovery device which comprises a cold box, the cold box is sequentially communicated with a first aromatic hydrocarbon separation tank and a tail gas turbine expansion generator through pipelines, and a discharge port of the tail gas turbine expansion generator is communicated with a second aromatic hydrocarbon separation tank through a pipeline. And the second aromatic hydrocarbon separation tank is respectively communicated with the cold box and the tail gas unit through pipelines. According to the utility model, oxidized tail gas pressure energy and heat energy are recovered for power generation, and the power consumption per ton of hydrogen peroxide is reduced by 10kw. The temperature of oxidized tail gas entering a tail gas unit is reduced, the adsorption effect is improved, the VOCs content of tail gas emission is reduced, and the loss of an aromatic solvent is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of energy recovery, in particular to an energy recovery device for oxidation tail gas produced by hydrogen peroxide. Background Art

[0002] In the reaction of the oxidation tower in hydrogen peroxide production, the oxygen in the air is partially reacted, and the remaining small amount of oxygen and nitrogen that cannot participate are discharged from the top of the oxidation tower in large quantities. This part of the gas is called oxidation tail gas. The oxidation tail gas is treated by the oxidation tail gas condenser, expander and tail gas unit and then discharged into the atmosphere. In the treatment process, the oxidation tail gas is cooled at the expansion end of the expander and then enters the compression end to do work. Balancing this part of the energy not only causes energy waste, but also increases the temperature of the oxidation tail gas, affecting the treatment effect of subsequent equipment. If certain measures can be taken to recover the energy of the oxidation tail gas, the production cost can be reduced. Summary of the invention

[0003] The purpose of the utility model is to make up for the shortcomings of the prior art and provide an energy recovery device for oxidation tail gas in hydrogen peroxide production, which uses the pressure energy in the process of process gas decompression to achieve approximately adiabatic isentropic expansion in a turbine expander, drives the turbine to rotate at high speed through the process gas to generate mechanical work, and drives the generator to produce electrical energy after deceleration.

[0004] The technical solution of this utility model:

[0005] A hydrogen peroxide production oxidation tail gas energy recovery device, the device comprises a cold box, the cold box is connected with a first aromatics separation tank and a tail gas turbine expansion generator in sequence through a pipeline, the tail gas turbine expansion generator outlet is connected with a second aromatics separation tank through a pipeline, and the second aromatics separation tank is connected with the cold box and the tail gas unit through pipelines respectively.

[0006] Preferably, a bypass pipeline and a first temperature regulating valve are provided on the hot gas side of the cold box.

[0007] Preferably, the inlet of the tail gas turbine expansion generator is provided with a first emergency shut-off valve.

[0008] Preferably, the tail gas turbine expansion generator is provided with a bypass pipeline connected to the second aromatic separation tank, and a second temperature regulating valve is provided on the bypass pipeline.

[0009] Preferably, a second emergency shut-off valve is provided on the bypass pipeline connecting the cold box and the tail gas unit.

[0010] The utility model has the following beneficial effects:

[0011] 1. Realize the recovery of oxidation tail gas pressure energy and heat energy for power generation, and reduce the power consumption by 10kw per ton of hydrogen peroxide.

[0012] 2. Reduce the temperature of the oxidized exhaust gas entering the exhaust unit, improve the adsorption effect, reduce the VOCs content in the exhaust gas, and reduce the loss of aromatic solvents. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 : Schematic diagram of the utility model hydrogen peroxide production oxidation tail gas energy recovery device;

[0014] Among them: cold box 1, first aromatic separation tank 2, tail gas turbine expansion generator 3, second aromatic separation tank 4 connected, tail gas unit 5, first temperature regulating valve 6, first emergency shut-off valve 7, second emergency shut-off valve 8, second temperature regulating valve 9. DETAILED DESCRIPTION

[0015] The following will be combined with the specific embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0016] Example 1

[0017] A hydrogen peroxide production oxidation tail gas energy recovery device, the device comprises a cold box 1, the cold box 1 is connected to a first aromatics separation tank 2 and a tail gas turbine expansion generator 3 in sequence through a pipeline, the tail gas turbine expansion generator 3 discharge port is connected to a second aromatics separation tank 4 through a pipeline, and the second aromatics separation tank 4 is connected to the cold box 1 and the tail gas unit 5 through pipelines.

[0018] Preferably, the hot gas side of the cold box 1 is provided with a bypass pipeline and a first temperature regulating valve 6. The inlet temperature of the tail gas turbine expansion generator 3 is controlled, so that the outlet temperature of the tail gas turbine expansion generator 3 is controlled to be greater than 0°C to ensure that there is no icing and damage to the equipment.

[0019] Preferably, the inlet of the tail gas turbine expansion generator 3 is provided with a first emergency shut-off valve 7. When the tail gas turbine expansion generator 3 is abnormal, the first emergency shut-off valve 7 can be closed urgently, and the bypass second emergency shut-off valve 8 can be opened to quickly shut off the tail gas turbine expansion generator 3.

[0020] Preferably, the tail gas turbine expansion generator 3 is provided with a bypass pipeline connected to the second aromatic separation tank 4, and the bypass pipeline is provided with a second temperature regulating valve 9. The outlet temperature of the tail gas turbine expansion generator 3 is auxiliary controlled to be greater than 0°C to ensure that there is no icing damage to the equipment.

[0021] Preferably, a second emergency shut-off valve 8 is provided on the bypass pipeline connecting the cold box 1 and the tail gas unit 5. When the tail gas turbine expansion generator 3 is abnormal, the first emergency shut-off valve 7 can be closed urgently, and the bypass second emergency shut-off valve 8 can be opened to quickly cut out the tail gas turbine expansion generator 3.

[0022] The unreacted tail gas in the oxidation tower is condensed in the oxidation tail gas condenser, and then separated into gas and liquid in the oxidation tail gas condensate receiving tank. After the non-condensable gas is discharged from the top, part of the gas enters the cold box 1, and part of the gas passes through the temperature regulating valve 6 and enters the tail gas turbine expansion generator 3 together. The tail gas turbine expansion generator 3 uses the pressure energy and thermal energy of the oxidation tail gas to generate electricity and reduce the temperature of the oxidation tail gas. The condensed tail gas is separated into a gas-liquid separator in the second aromatic separation tank 4. The non-condensable gas enters the cold box 1 for heat exchange, and then is discharged after adsorbing organic matter in the tail gas through the tail gas unit 5.

[0023] The above are only relatively preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A hydrogen peroxide production oxidation tail gas energy recovery device, characterized in that: The device comprises a cold box (1), wherein the cold box (1) is connected to a first aromatics separation tank (2) and a tail gas turbine expansion generator (3) in sequence through a pipeline, the discharge port of the tail gas turbine expansion generator (3) is connected to a second aromatics separation tank (4) through a pipeline, and the second aromatics separation tank (4) is connected to the cold box (1) and the tail gas unit (5) through pipelines.

2. The hydrogen peroxide production oxidation tail gas energy recovery device according to claim 1, characterized in that: The hot gas side of the cold box (1) is provided with a bypass pipeline and a first temperature regulating valve (6).

3. The hydrogen peroxide production oxidation tail gas energy recovery device according to claim 1, characterized in that: The inlet of the tail gas turbine expansion generator (3) is provided with a first emergency shut-off valve (7).

4. The hydrogen peroxide production oxidation tail gas energy recovery device according to claim 1, characterized in that: The tail gas turbine expansion generator (3) is provided with a bypass pipeline connected to the second aromatic hydrocarbon separation tank (4), and a second temperature regulating valve (9) is provided on the bypass pipeline.

5. The hydrogen peroxide production oxidation tail gas energy recovery device according to claim 1, characterized in that: A second emergency shut-off valve (8) is provided on a bypass pipeline connecting the cold box (1) and the tail gas unit (5).

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