Atmosphere-adjustable multi-staged swirl ammonia burner

Patent metadata

Field	Value
Publication number	US-11747014-B2
Application number	US-202217580504-A
Country	US
Kind code	B2
Filing date	Jan 20, 2022
Priority date	Aug 12, 2021
Publication date	Sep 5, 2023
Grant date	Sep 5, 2023

Abstract

The present application provides an atmosphere-adjustable multi-staged swirl ammonia burner, including a combustion structure, a tangential inflow structure, a secondary-air structure, and an ammonia adjustment structure. The combustion structure includes a swirl-flow pre-combustion chamber, a combustion housing, and a staged-flow adjustment assembly. The staged-flow adjustment assembly is configured to introduce staged airflows into the combustion chamber. The tangential inflow structure is configured to introduce air and fuel gas into the swirl-flow pre-combustion chamber. The secondary-air structure is disposed between the combustion housing and the tangential inflow structure. The ammonia adjustment structure extends through the tangential inflow structure to the combustion chamber and includes a branched inlet pipe and a central adjustment assembly. The branched inlet pipe is configured to introduce ammonia gas. The central adjustment assembly is configured to adjust a spray shape of the ammonia gas introduced from the branched inlet pipe.

First claim

What is claimed is:

1. An atmosphere-adjustable multi-staged swirl ammonia burner, comprising:
a combustion structure comprising a swirl-flow pre-combustion chamber, a combustion housing, and a staged-flow adjustment assembly which are sequentially arranged, the combustion housing defining a combustion chamber, the swirl-flow pre-combustion chamber being in fluid communication with the combustion chamber, and the staged-flow adjustment assembly being disposed on a side wall of the combustion housing and away from the swirl-flow pre-combustion chamber, the staged-flow adjustment assembly being in fluid communication with the combustion chamber and configured to introduce staged airflows into the combustion chamber;
a tangential inflow structure disposed on a top of the swirl-flow pre-combustion chamber, fluid communicated with the swirl-flow pre-combustion chamber, and configured to introduce air and fuel gas into the swirl-flow pre-combustion chamber;
a secondary-air structure disposed between the combustion housing and the tangential inflow structure, the secondary-air structure and the tangential inflow structure surrounding the swirl-flow pre-combustion chamber, and the secondary-air structure being in fluid communication with the combustion chamber and configured to introduce secondary air into the combustion chamber; and
an ammonia adjustment structure extending through the tangential inflow structure into the combustion chamber, the ammonia adjustment structure comprising a branched inlet pipe and a central adjustment assembly, one end of the central adjustment assembly extending through the tangential inflow structure into the combustion structure, one end of the branched inlet pipe being in fluid communication with the central adjustment assembly and the combustion chamber, the branched inlet pipe being configured to introduce ammonia gas, and the central adjustment assembly being configured to adjust spray shape of the ammonia gas introduced from the branched inlet pipe.

2. The atmosphere-adjustable multi-staged swirl ammonia burner of claim 1 , wherein the central adjustment assembly comprises a central pipe and an adjustment pipe; the central pipe is a hollow member, and one end of the central pipe passes through the tangential inflow structure and is in fluid communication with the combustion chamber; the adjustment pipe defines a flow-adjustment hole extending along an axial direction of the adjustment pipe, the branched inlet pipe is connected to the central pipe and is in fluid communication with the central pipe through the adjustment pipe, and the adjustment pipe is movably arranged in the central pipe and is configured to adjust a fluid communication area between the flow-adjustment hole and the branched inlet pipe.

3. The atmosphere-adjustable multi-staged swirl ammonia burner of claim 2 , wherein a projection of the flow-adjustment hole in the axial direction of the adjustment pipe is rectangular; an axial dimension of the flow-adjustment hole is greater than a diameter of the branched inlet pipe.

4. The atmosphere-adjustable multi-staged swirl ammonia burner of claim 2 , wherein the central adjustment assembly comprises an ejecting head which is a hollow member, and the ejecting head is mounted to an end of the central pipe located in the combustion chamber; the ejecting head defines a plurality of ejecting holes, and the plurality of ejecting holes are distributed in rows spaced from each other, and a lowermost ejecting hole is located at the bottom of the ejecting head and coincides with an axis of the central pipe, the ejecting holes are configured to inject ammonia gas into the combustion chamber;
an extending angle between an extending direction of each ejecting hole and a horizontal direction is greater than or equal to 0° and less than or equal to 90°, along the axial direction of the central pipe from bottom to top, the extending angle of the ejecting holes gradually decreases from 90° to 0°.

5. The atmosphere-adjustable multi-staged swirl ammonia burner of claim 4 , wherein the number of rows of the ejecting holes is five, the extending angle between the extending directions of the ejecting holes of a first row and the horizontal direction is 0° to 5°, the extending angle between the extending directions of the ejecting holes of a second row and the horizontal direction is 25° to 35°, the extending angle between the extending directions of the ejecting holes of a third row and the horizontal direction is 55° to 65°, the extending angle between the extending directions of the ejecting holes of a fourth row and the horizontal direction is 70° to 80°, the ejecting hole of a fifth row is arranged at the bottom of the ejecting head and extends along a vertical direction.

6. The atmosphere-adjustable multi-staged swirl ammonia burner of claim 1 , wherein the secondary-air structure comprises:
two coaxially arranged secondary-air pipes defining a secondary-air channel therebetween; and
a plurality of axial vanes disposed in the secondary-air channel,
wherein the coaxially arranged secondary-air pipes are connected between the combustion housing and the tangential inflow structure;
the coaxially arranged secondary-air pipes comprises a first pipe and a second pipe; the first pipe is sleeved outside the second pipe, the first pipe is connected to the combustion housing, and the second pipe is connected to the tangential inflow structure.

7. The atmosphere-adjustable multi-staged swirl ammonia burner of claim 6 , wherein the secondary-air channel comprises a radial channel extending in a radial direction and an axial channel extending in an axial direction and fluid communicating with the radial channel; one end of the radial channel is in fluid communication with an external environment, and the other end of the radial channel is in fluid communication with one end of the axial channel; the other end of the axial channel is in fluid communication with the combustion chamber, the plurality of axial vanes are arranged in the axial channel.

8. The atmosphere-adjustable multi-staged swirl ammonia burner of claim 6 , wherein the tangential inflow structure comprises a tangential structure, and the tangential structure is arranged on a top of the secondary-air pipes and cooperatively defines the swirl-flow pre-combustion chamber with an inner wall of the second pipe;
an inner tangential channel and an outer tangential channel are defined in the tangential structure, the inner tangential channel and the outer tangential channel are both in fluid communication with the swirl-flow pre-combustion chamber; the outer tangential channel is configured for conveying air, and the inner tangential channel is configured for conveying fuel gas; the inner tangential channel and the outer tangential channel are parallel to and spaced from each other.

9. The atmosphere-adjustable multi-staged swirl ammonia burner of claim 7 , wherein the outer tangential channel coincides with a tangent to circular inner wall of the tangential structure, and the inner tangential channel is located at a clockwise side of the outer tangential channel.

10. The atmosphere-adjustable multi-staged swirl ammonia burner of claim 7 , wherein the inner tangential channel and the outer tangential channel constitute a pair of channels, and a plurality of pairs of channels are defined in the tangential structure, and the plurality of pairs of channels are disposed along an outer peripheral surface of the tangential structure and spaced from each other.

11. The atmosphere-adjustable multi-staged swirl ammonia burner of claim 6 , wherein the combustion structure further comprises a diverging pipe, and the diverging pipe is disposed betwe

Assignees

• Univ Tsinghua

Inventors

• Li shui-qing
• Song Min-Hang
• Sun jin-guo
• Huang Qian

Classifications

• Y02E20/34

  Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery · CPC title

• F23D14/26 Primary

  with provision for a retention flame (pilot flame igniters F23Q9/00) · CPC title

• F23C1/00 Primary

  Combustion apparatus specially adapted for combustion of two or more kinds of fuel simultaneously or alternately, at least one kind of fuel being either a fluid fuel or a solid fuel suspended in {a carrier gas or} air (combustion apparatus characterized by the combination of two or more combustion chambers F23C6/00; pilot flame igniters F23Q9/00) · CPC title

• F23C6/045

  with staged combustion in a single enclosure · CPC title

• F23D14/24 Primary

  at least one of the fluids being submitted to a swirling motion · CPC title