A hybrid combined firing device
By setting up an inner and outer pipe structure in the co-firing device, heat exchange and uniform mixing of biomass gas and natural gas are achieved, solving the problem of unstable combustion caused by gas temperature difference, and improving combustion efficiency and equipment safety.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- POWERCHINA SEPCO1 ELECTRIC POWER CONSTR CO LTD
- Filing Date
- 2025-06-23
- Publication Date
- 2026-07-07
AI Technical Summary
The large temperature difference between biomass gas and natural gas during co-firing leads to uneven gas mixing, unstable combustion flame, and affects combustion efficiency, equipment lifespan, and safety.
A mixing and co-firing device is adopted, which sets up an inner pipe inside the outer pipe. The outer pipe is connected to the biomass gas pipeline, and the inner pipe is connected to the natural gas pipeline. This realizes heat exchange between biomass gas and natural gas, reduces the temperature difference, and mixes the gases through the mixing pipe to ensure uniform mixing.
It achieves uniform mixing of biomass fuel gas and natural gas, improves combustion efficiency, avoids unstable combustion flame, extends equipment life and improves safety.
Smart Images
Figure CN224470215U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to gas blending combustion technical field especially relates to a mixed blending combustion device. BACKGROUND
[0002] Biomass gas refers to the combustible energy converted from crop straw, forest waste, edible fungus residue, poultry manure and all combustible materials, and the biomass gas is prepared by a biomass gasification furnace, and the gas preparation principle of the biomass gasification furnace is to consume oxygen content in a hearth, and a large amount of combustible gas such as CO, H2 and CH4 is generated by adopting a negative pressure smoldering mode.
[0003] At present, most of the commonly used burners adopt natural gas as fuel, and the cost of natural gas is gradually increasing, so the biomass gasification furnace is directly connected with the natural gas pipeline through a pipeline, and the mixed gas of biomass gas and natural gas is used as fuel, so that the cost can be greatly reduced.
[0004] However, the biomass gas produced by the negative pressure smoldering mode has a high temperature (300-450 DEG C), and there is a large temperature difference between the biomass gas and the natural gas, when the temperature difference between the two different gases is high during blending combustion, the gas mixture is not uniform, the combustion flame is unstable, the flame shape and the combustion rate fluctuate, the complete combustion of the fuel is affected, the combustion efficiency is reduced, the flame load distribution of the boiler or the burner is uneven, and the service life and safety of the equipment are affected. UTILITY MODEL CONTENTS
[0005] In view of the defects or deficiencies in the prior art, the utility model provides a mixed blending combustion device, which can reduce the temperature difference between biomass gas and natural gas, ensure the combustion efficiency, and improve the service life and safety of the equipment.
[0006] To achieve the above object, the utility model adopts the following technical scheme:
[0007] The embodiment of the utility model provides a kind of mixed blending combustion device, including outer tube and inner tube, the inner tube is fixed in outer tube interior by support, and inner tube axis coincides with outer tube axis, and the outer tube one end is connected with biomass gas pipeline by flange, and the inner tube one end is connected with natural gas pipeline by flange.
[0008] Further, the outer tube is connected with the mixing pipe at one end away from the biomass gas pipeline, and the outer tube and the mixing pipe are connected by flange.
[0009] Further, the support is fixed on the outer wall of the inner tube and the inner wall of the outer tube at both ends.
[0010] Further, a connecting hole is formed in the wall of the outer tube, and the diameter of the connecting hole is the same as the diameter of the inner tube.
[0011] Further, the inner tube is bent outwardly from one end of the mixing tube to the side of the outer tube wall and extends from the connecting hole to the outside of the outer tube.
[0012] Further, the connecting part of the inner tube wall and the outer tube wall is sealed by welding.
[0013] Further, the end of the inner tube outside the outer tube is connected to the natural gas pipeline through a flange.
[0014] Further, the mixing tube is provided with a burner at one end away from the outer tube.
[0015] Further, the biomass gas pipeline is provided with a biomass gas shut-off valve.
[0016] Further, the natural gas pipeline is provided with a natural gas shut-off valve.
[0017] Compared with the prior art, the biomass gas and natural gas mixing and burning device has the beneficial effects that:
[0018] The biomass gas and natural gas mixing and burning device has the beneficial effects that: BRIEF DESCRIPTION OF DRAWINGS
[0019] Figure 1 The biomass gas and natural gas mixing and burning device has the beneficial effects that:
[0020] 1, outer tube; 2, inner tube; 3, mixing tube; 4, biomass gas pipeline; 5, natural gas pipeline; 6, burner; 7, biomass gas shut-off valve; 8, natural gas shut-off valve. DETAILED DESCRIPTION
[0021] The biomass gas and natural gas mixing and burning device has the beneficial effects that:
[0022] A typical embodiment of the biomass gas and natural gas mixing and burning device has the beneficial effects that: Figure 1As shown, a mixing and co-firing device includes an outer tube 1, an inner tube 2, and a mixing tube 3. The outer tube 1, inner tube 2, and mixing tube 3 are all circular tubes. The outer tube 1 and mixing tube 3 have the same diameter, while the inner tube 2 has a smaller diameter than the outer tube 1. The outer tube 1 and mixing tube 3 are connected by a flange. The inner tube 2 is located inside the outer tube 1, and the axis of the inner tube 2 coincides with the axis of the outer tube 1 to ensure a larger heat exchange area. The outer wall of the inner tube 2 is connected to the inner wall of the outer tube 1 by a support to ensure the stability of the inner tube 2.
[0023] The end of the outer pipe 1 away from the mixing pipe 3 is connected to a biomass gas pipeline 4. The biomass gas pipeline 4 is connected to the outer pipe 1 through a flange, and the biomass gas enters the interior of the outer pipe 1 through the biomass gas pipeline 4.
[0024] A connection hole is provided on the wall of the outer tube 1. The diameter of the connection hole is the same as that of the inner tube 2. The end of the inner tube 2 away from the mixing tube 3 is bent toward the wall of the outer tube 1 and extends from the connection hole to the outside of the outer tube 1.
[0025] The connection between the inner tube 2 wall and the outer tube 1 wall is sealed by welding to ensure the airtightness of the outer tube 1.
[0026] The end of the inner pipe 2 away from the mixing pipe 3 is connected to the natural gas pipeline 5. The natural gas pipeline 5 and the inner pipe 2 are connected by a flange, and the natural gas enters the inner pipe 2 through the natural gas pipeline 5.
[0027] Since the temperature of biomass gas is higher than that of natural gas, when biomass gas enters the outer pipe 1 and natural gas enters the inner pipe 2, heat exchange occurs between the biomass gas and natural gas. The temperature of biomass gas decreases and the temperature of natural gas increases, reducing the temperature difference between the two. At this time, the biomass gas and natural gas enter the mixing pipe 3 for mixing. Since the temperatures of the two gases are similar during mixing, uniform mixing is ensured. A burner 6 is installed at the end of the mixing pipe 3 away from the outer pipe 1. The mixed gas is transported to the burner 6 for combustion through the mixing pipe 3.
[0028] A biomass gas shut-off valve 7 is installed on the biomass gas pipeline 4, and a natural gas shut-off valve 8 is installed on the natural gas pipeline 5. The biomass gas pipeline 4 or the natural gas pipeline 5 can be shut off separately to achieve biomass gas or natural gas combustion.
[0029] By installing an inner pipe inside the outer pipe, with the outer pipe connected to the biomass gas pipeline and the inner pipe connected to the natural gas pipeline, heat exchange between the biomass gas and natural gas can be achieved when they are mixed and burned. This reduces the temperature difference between the two gases, ensures uniform mixing, avoids unstable combustion flames, improves combustion efficiency, and prevents uneven heat load distribution on the boiler or burner, thus improving the service life and safety of the equipment.
[0030] The above merely describes preferred embodiments of the present application and is not intended to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims
1. A mixing and co-firing device, characterized in that, It includes an outer pipe and an inner pipe. The inner pipe is fixed inside the outer pipe by a bracket. The axis of the inner pipe coincides with the axis of the outer pipe. One end of the outer pipe is connected to a biomass gas pipeline through a flange, and one end of the inner pipe is connected to a natural gas pipeline through a flange.
2. The mixing and co-firing device as described in claim 1, characterized in that, The outer pipe is connected to a mixing pipe at the end furthest from the biomass gas pipeline, and the outer pipe and the mixing pipe are connected by a flange.
3. The mixing and co-firing device as described in claim 1, characterized in that, The two ends of the bracket are fixed to the outer wall of the inner tube and the inner wall of the outer tube, respectively.
4. The mixing and co-firing device as described in claim 2, characterized in that, The outer tube has a connecting hole on its wall, and the diameter of the connecting hole is the same as that of the inner tube.
5. The mixing and co-firing device as described in claim 4, characterized in that, The end of the inner tube away from the mixing tube bends toward the wall of the outer tube and extends from the connection hole to the outside of the outer tube.
6. The mixing and co-firing apparatus as described in claim 5, characterized in that, The connection between the inner tube wall and the outer tube wall is sealed by welding.
7. The mixing and co-firing apparatus as described in claim 6, characterized in that, The inner pipe, located outside the outer pipe, is connected to the natural gas pipeline via a flange.
8. The mixing and co-firing device as described in claim 2, characterized in that, A burner is provided at the end of the mixing tube furthest from the outer tube.
9. A mixing and co-firing device as described in claim 1, characterized in that, The biomass gas pipeline is equipped with a biomass gas shut-off valve.
10. A mixing and co-firing apparatus as described in claim 1, characterized in that, The natural gas pipeline is equipped with a natural gas shut-off valve.