# US 11,027,234 B2 · Oxidization of ammonia desulfurization solution

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- Number: US 11,027,234 B2
- Document ID: US11027234B2
- Status: Granted
- Kind: B2
- Application number: 16/007,875
- Filed: 2018-06-13
- Published: 2019-10-17
- Granted: 2021-06-08
- Earliest claimed: 2018-04-13
- Assignees: Jiangnan Environmental Protection Group Inc.
- Applicants: Jiangnan Environmental Protection Group Inc.
- Inventors: Jing Luo; Lifang Qi; Yongying Luo
- Web page: https://patentgrep.com/patent/US11027234B2

## CPC

- B01D 53/502: {characterised by a specific solution or suspension}
- B01D 53/1481: {Removing sulfur dioxide or sulfur trioxide}
- B01D 53/1493: {Selection of liquid materials for use as absorbents}
- B01D 53/504: {characterised by a specific device}
- B01D 53/77: Liquid phase processes
- B01D 53/96: Regeneration, reactivation or recycling of reactants
- B01D 2251/102: Oxygen
- B01D 2251/2062: Ammonia
- B01D 2252/102: Ammonia
- B01D 2258/0283: Flue gases
- Y02A 50/20: Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
- B01D: SEPARATION (separating solids from solids by wet methods B03B, B03D; by pneumatic jigs or tables B03B; by other dry methods B07; magnetic or electrostatic separation of solid materials from solid materials or fluids, separation by high-voltage electric fields B03C; centrifuges, vortex apparatus B04; presses per se for squeezing-out liquid from liquid-containing material B30B9/02; treatment of water C02F, e.g. softening by ion-exchange C02F1/42; {arrangements of air intake cleaners in gas turbine plants F02C7/05} ; arrangements or mounting of filters in air-conditioning, air-humidification or ventilation F24F13/28)
- Y02A: TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE

## Abstract

Apparatus and methods for oxidizing an ammonia desulfurization solution. The apparatus may include an oxidation air system. The apparatus may include an oxidation tank. The apparatus may include in the tank, a gas-liquid dispersion enhancer. The enhancer may include a sieve plate layer that includes a sieve plate. The sieve plate layer may be one of a plurality of sieve plate layers. The plurality may include two or three sieve plate layers. The apparatus may include an oxidation enhancing device mated to the tank. The oxidation enhancing device may include an acoustic wave generating device. The oxidation enhancing device includes an ultrasonic wave generating device. The ultrasonic generating device may be configured to provide a sound intensity in the range 12 to 40 Watts/Liter. The ultrasonic generating device may be configured to provide to a liquid sound intensity in the range 12 to 40 Watts/Liter.

## Claims

### Claim 1

A method for oxidizing an ammonia-bearing desulfurization solution, the method comprising:
feeding the desulfurization solution to a tank;
providing pressurized air to the tank;
then, expanding the air, at an air distribution stage in the tank, against the desulfurization solution, wherein the distribution stage is configured to force oxidization of the desulfurization solution;
oxidizing the desulfurization solution by means of the expanding to produce oxidized solution;
exiting the oxidized solution from the tank via an absorption liquid outlet of the tank;
then, adding ammonia to, and thereby increasing the ammonia content of the oxidized solution,
then, providing the oxidized solution to a plurality of different sections of a flue gas desulfurization tower, the providing the oxidized solution including:
sending a first fraction of the oxidized solution from the absorption liquid outlet to a washing and cooling section of the tower and spraying the oxidized solution in the washing and cooling section; and
sending a second fraction of the oxidized solution from the absorption liquid outlet to an absorption section of the tower and spraying the oxidized solution in the absorption section;
then, reacting, in the absorption section, the oxidized solution with a flue gas and circulating resultant reacted solution through the tower; and
controlling the circulating so that, after the circulating and upon the feeding, circulated solution has:
0.1 to 8 wt % ammonium sulfite and ammonium bisulfite; and 2 to 38 wt % ammonium sulfate.

### Claim 2 (depends on 1)

The method of claim 1 further comprising receiving the desulfurization solution to be fed into the tank from an output of the absorption section of the tower after the reacting in the absorption section.

### Claim 3 (depends on 1)

The method of claim 1 further comprising flowing the air into the tank at a rate no less than that stoichiometrically required to oxidize ammonium sulfite and ammonium bisulfate in the solution.

### Claim 4 (depends on 1)

The method of claim 1 further comprising sending air to the absorption section of the tower to provide secondary oxidation of the reacted solution, the secondary oxidation provided external to the tank.

### Claim 5 (depends on 4)

The method of claim 4 wherein the air is sent from an oxidation air outlet of the tank.

### Claim 6 (depends on 1)

The method of claim 1 further comprising selecting a volume for the tank so that the solution has an oxidation time in the tank of 5 to 90 min.

### Claim 7 (depends on 1)

The method of claim 1 wherein the air is pressurized at 0.05-0.3 MPa (gauge).

### Claim 8 (depends on 1)

The method of claim 1 wherein the tank is mated to the tower.

### Claim 9 (depends on 1)

The method of claim 1 wherein the tank is disposed separate from the tower.

### Claim 10 (depends on 1)

The method of claim 1 wherein the air distribution stage is a second to sixth stage of a multi-stage distribution.

### Claim 11

A method for oxidizing an ammonia-bearing desulfurization solution, the method comprising: expanding air, at an air distribution stage in a tank, against the desulfurization solution, the air distribution stage configured to produce oxidation of the solution;
enhancing the oxidation of the solution using an oxidation enhancing device;
oxidizing the solution by the expanding and the enhancing, to produce oxidized solution;
after the enhancing:
exiting the oxidized solution from the tank via an absorption liquid outlet of the tank;
then, adding ammonia to, and thereby increasing the ammonia content of the oxidized solution;
then, providing the oxidized solution to a plurality of different sections of a flue gas desulfurization tower, the different sections including an absorption section;
after the providing, reacting, in the absorption section, the oxidized solution with a flue gas, producing reacted solution; and,
after the reacting, feeding the reacted solution to the tank.

### Claim 12 (depends on 11)

The method of claim 11 further comprising flowing the air into the tank at a rate no less than that stoichiometrically required to oxidize ammonium sulfite and ammonium bisulfite in the reacted solution.

### Claim 13 (depends on 12)

The method of claim 12 wherein the rate is 1.2 to 20 times that stoichiometrically required.

### Claim 14 (depends on 11)

The method of claim 11 further comprising selecting a volume for the tank so that the desulfurization solution has an oxidation time in the tank of 5 to 90 minutes.

### Claim 15 (depends on 11)

The method of claim 11 further comprising, after the reacting, receiving the reacted solution into the tank from an output of the absorption section of the tower.

### Claim 16 (depends on 11)

The method of claim 11 wherein the oxidation enhancing device is mated to the tank.

### Claim 17 (depends on 11)

The method of claim 11 wherein the oxidation enhancing device includes an acoustic wave generating device.

### Claim 18 (depends on 11)

The method of claim 11 wherein the oxidation enhancing device includes an ultrasonic wave generating device.

### Claim 19 (depends on 18)

The method of claim 18 wherein the ultrasonic generating device is configured to emit an ultrasonic frequency in the range 50 to 100 kHz.

### Claim 20 (depends on 19)

The method of claim 19 wherein:
the frequency is in the range 60 to 85 kHz; and
the ultrasonic generating device is configured to provide a sound intensity in the range 12 to 40 Watts/Liter.

### Claim 21 (depends on 20)

The method of claim 20 wherein the sound intensity is in the range 18 to 24 Watts/Liter.

### Claim 22 (depends on 11)

The method of claim 11 wherein the oxidation enhancing device includes an infrared ray generating device.

### Claim 23 (depends on 11)

The method of claim 11 wherein the oxidation enhancing device includes an ultraviolet light generating device.

### Claim 24 (depends on 11)

The method of claim 11 wherein the oxidation enhancing device includes an electron beam generating device.

### Claim 25 (depends on 11)

The method of claim 11 wherein the oxidation enhancing device includes a feature selected from the group consisting of:
an acoustic wave generating device;
an ultrasonic wave generating device;
an infrared ray generating device;
an ultraviolet light generating device;
an electron beam generating device; and
a combination of two or more of the foregoing features.

### Claim 26 (depends on 11)

The method of claim 11 wherein the providing includes spraying the oxidized solution in a washing and cooling section of the tower.

### Claim 27 (depends on 11)

The method of claim 11 wherein the providing includes spraying the oxidized solution in the absorption section of the tower.

### Claim 28 (depends on 11)

The method of claim 11 further comprising sending air to the absorption section of the tower to provide secondary oxidation of the reacted solution.

### Claim 29 (depends on 11)

The method of claim 11 wherein the oxidation enhancing device is configured to force oxidization of the solution.

### Claim 30 (depends on 29)

The method of claim 29 wherein the oxidation enhancing device is a multi-stage gas distributor.

### Claim 31 (depends on 11)

The method of claim 11 wherein the tank is disposed separate from the tower.

### Claim 32

A method for oxidizing an ammonia-hearing desulfurization solution, the method comprising:
expanding air, at an air distribution stage in a tank, against the desulfurization solution, the air distribution stage configured to produce oxidation of the solution;
oxidizing the desulfurization solution by means of the air distribution stage to produce oxidized solution;
after the oxidizing,
exiting the oxidized solution from the tank via an absorption liquid outlet of the tank;
then, adding ammonia to, and thereby Increasing the, ammonia content of the oxidized solution:
then, providing the oxidized solution to a plurality of different sections of a flue gas desulfurization tower, the different sections including an absorption section;
after the providing, reacting, in the absorption section, the oxidized solution with a flue gas, producing reacted solution; and,
after the reacting, feeding the reacted solution to the tank.