A PSA nitrogen generator oxygen-enriched desorption gas recovery device for cement kiln oxygen-enriched combustion

Abstract

The utility model provides a kind of PSA nitrogen generator oxygen-enriched desorption gas recovery device for cement kiln oxygen-enriched combustion, including oxygen-enriched desorption gas buffer tank, the oxygen-enriched desorption gas buffer tank pipeline connection PSA nitrogen generator;The oxygen-enriched desorption gas buffer tank pipeline connection linear regulator, the linear regulator pipeline connection oxygen-enriched mixer;The oxygen-enriched mixer is connected by oxygen pipeline connection cement kiln combustion system, and is provided with conveying fan on the oxygen pipeline connection.The utility model is through recovery PSA nitrogen generator oxygen-enriched desorption gas, combines buffer pressure stabilization, linear regulation and uniform mixing technology, realizes the oxygen-enriched combustion application of low cost, high efficiency.Compared with traditional oxygen production mode, the device is lower in investment, can stably output oxygen-enriched gas meeting combustion requirement, effectively solves the problem of unstable emission and uneven concentration.Through optimizing combustion condition, can significantly reduce flue gas heat loss, improve flame temperature, reach the effect of energy saving and cost reduction, with remarkable practical value and economic benefit.

Description

Technical Field

[0001] This utility model relates to the field of energy conservation in cement production, and in particular to a PSA nitrogen generator oxygen-enriched gas recovery device for oxygen-enriched combustion in cement kilns. Background Technology

[0002] In cement production, rotary kiln combustion systems typically use ordinary air for combustion, but this results in low combustion efficiency and high coal consumption. Oxygen-enriched combustion technology can increase flame temperature and reduce flue gas losses, thereby lowering fuel consumption. Currently, the cement industry mainly uses membrane oxygen production or cryogenic air separation for oxygen production, but these methods involve large equipment investments and high operating costs.

[0003] PSA nitrogen generators emit oxygen-enriched desorbed gas during nitrogen production, with an oxygen concentration between 26% and 29%. However, due to the non-linear and uneven nature of this emission, direct use in combustion can affect operational stability. In existing technologies, this oxygen-enriched desorbed gas is typically emitted directly, resulting in resource waste. Therefore, there is an urgent need for a low-cost, high-efficiency oxygen-enriched desorbed gas recovery device for stable application in oxygen-enriched combustion in cement kilns. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a PSA nitrogen generator oxygen-enriched gas recovery device for cement kiln oxygen-enriched combustion that makes full use of oxygen-enriched desorbed gas, improves the combustion efficiency of rotary kiln, and reduces the system coal consumption.

[0005] The equipment includes an oxygen-enriched desorption gas buffer tank, which is connected to a PSA nitrogen generator via a pipeline; that is, the input end of the oxygen-enriched desorption gas buffer tank is connected to the exhaust end of the PSA nitrogen generator to collect the oxygen-enriched desorption gas discharged from it. The oxygen-enriched desorption gas buffer tank is connected to a linear regulator, and the linear regulator is connected to an oxygen-enriched mixer. That is, the oxygen-enriched desorption gas discharged from the PSA nitrogen generator is depressurized by the oxygen-enriched desorption gas buffer tank and then enters the linear regulator for pressure stabilization, thus stabilizing the output pressure; and because the oxygen-enriched desorption gas discharged from the PSA nitrogen generator is non-linearly discharged, the pressure is compensated by the oxygen-enriched mixer when the pressure is insufficient, so as to maintain the stable output gas pressure. The oxygen-enriched mixer is connected to the cement kiln combustion system via an oxygen supply pipeline, and a conveying fan is installed on the oxygen supply pipeline.

[0006] The beneficial effects of this invention are as follows: By recovering the oxygen-enriched desorbed gas from the PSA nitrogen generator and combining it with buffering, pressure stabilization, linear regulation, and uniform mixing technologies, this invention achieves low-cost, high-efficiency oxygen-enriched combustion. Compared to traditional oxygen production methods, this device requires less investment and can stably output oxygen-enriched gas that meets combustion requirements, effectively solving the problems of unstable emissions and uneven concentration. By optimizing combustion conditions, it can significantly reduce flue gas heat loss and increase flame temperature, achieving energy saving and consumption reduction effects, and has significant practical value and economic benefits. Attached Figure Description

[0007] Figure 1 This is a schematic diagram of the structure of a PSA nitrogen generator oxygen-enriched desorption gas recovery device for oxygen-enriched combustion in a cement kiln, as described in this utility model. Figure label: 1-PSA nitrogen generator; 2-Oxygen-enriched desorption gas buffer tank; 3-Oxygen-enriched mixer; 4-Linear regulator; 5-Cement kiln combustion system The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0008] Reference Figure 1 The present invention provides a PSA nitrogen generator oxygen-enriched gas recovery device for oxygen-enriched combustion in cement kilns, comprising an oxygen-enriched gas buffer tank 2, wherein the oxygen-enriched gas buffer tank 2 is connected to the PSA nitrogen generator 1 by a pipeline; that is, the input end pipeline of the oxygen-enriched gas buffer tank 2 is connected to the exhaust end of the PSA nitrogen generator 1 to collect the oxygen-enriched gas discharged from it. The oxygen-enriched desorption gas buffer tank 2 is connected to the linear regulator 4, and the linear regulator 4 is connected to the oxygen-enriched mixer 3. That is, the oxygen-enriched desorption gas discharged from the PSA nitrogen generator 1 is depressurized by the oxygen-enriched desorption gas buffer tank 2 and enters the linear regulator 4 for pressure stabilization, thus stabilizing the output pressure; and because the oxygen-enriched desorption gas discharged from the PSA nitrogen generator 1 is non-linearly discharged, when the pressure is insufficient, the oxygen-enriched mixer 3 compensates for the pressure and keeps the output gas pressure stable. The oxygen-enriched mixer 3 is connected to the cement kiln combustion system 5 via an oxygen supply pipeline, and a conveying fan is installed on the oxygen supply pipeline.

[0009] Furthermore, the PSA nitrogen generator 1 can be one or more units.

[0010] The effect achieved is to recover oxygen-enriched gas from multiple PSA nitrogen generators 1 using a single device.

[0011] In Example 1, the oxygen-enriched mixer 3 is equipped with a multi-layer gas distribution plate.

[0012] This ensures that the oxygen concentration is mixed evenly.

[0013] In Example 2, the PSA nitrogen generator 1 and the oxygen-enriched desorption gas buffer tank 2 are connected by a DN150 pressure-resistant pipe via a flange, and an electric shut-off valve and a pressure relief valve are installed on the pipe.

[0014] The effect achieved is to control the on / off of oxygen-enriched gas through an electric shut-off valve, preventing backflow under low pressure; and to prevent overpressure and improve safety through a pressure relief valve.

[0015] In Example 3, a check valve and a manual gate valve are also installed on the oxygen delivery pipeline at the rear of the conveying fan.

[0016] This achieves the effect of preventing gas backflow.

[0017] Example 4: The oxygen supply pipeline is connected to the cement kiln combustion system 5 via a three-way valve, and the other passage of the three-way valve is connected to the original air duct. A flame arrester and an explosion relief disc are also installed at the end of the air supply duct of the cement kiln combustion system 5.

[0018] This is to prevent backfire and overpressure, and to ensure the safe operation of the system.

[0019] Preferably, the above-mentioned devices are connected to the DCS and controlled collaboratively based on the DCS.

[0020] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. It will be apparent to those skilled in the art that this utility model is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of this utility model is defined by the appended claims rather than the foregoing description, and thus all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this utility model. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0021] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A device for recovering oxygen-enriched desorption gas from a PSA nitrogen generator used in oxygen-enriched combustion of cement kilns, comprising an oxygen-enriched desorption gas buffer tank, characterized in that: The oxygen-enriched desorption gas buffer tank is connected to the PSA nitrogen generator; the oxygen-enriched desorption gas buffer tank is connected to the linear regulator; and the linear regulator is connected to the oxygen-enriched mixer. The oxygen-enriched mixer is connected to the cement kiln combustion system via an oxygen supply pipeline, and a conveying fan is installed on the oxygen supply pipeline.

2. The oxygen-enriched gas recovery device for a PSA nitrogen generator used in oxygen-enriched combustion of a cement kiln according to claim 1, characterized in that, The PSA nitrogen generator may be one or more.

3. The oxygen-enriched gas recovery device for a PSA nitrogen generator used in oxygen-enriched combustion of a cement kiln according to claim 1, characterized in that, The oxygen-enriched mixer is equipped with multiple gas distribution plates.

4. The oxygen-enriched gas recovery device for a PSA nitrogen generator used in oxygen-enriched combustion of a cement kiln according to claim 1, characterized in that, The PSA nitrogen generator and the oxygen-enriched desorption gas buffer tank are connected by a DN150 pressure-resistant pipeline via a flange, and an electric shut-off valve and a pressure relief valve are installed on the pipeline.

5. The oxygen-enriched gas recovery device for a PSA nitrogen generator used in oxygen-enriched combustion of a cement kiln according to claim 1, characterized in that, The oxygen delivery pipeline at the rear of the conveying fan is also equipped with a check valve and a manual gate valve.

6. The oxygen-enriched gas recovery device for a PSA nitrogen generator used in oxygen-enriched combustion of a cement kiln according to claim 1, characterized in that, The oxygen supply pipeline is connected to the cement kiln combustion system via a three-way valve, and the other passage of the three-way valve is connected to the original air duct. A flame arrester and an explosion relief disc are also installed at the end of the air supply duct of the cement kiln combustion system.

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