Air and flame measuring device

Abstract

The utility model provides a kind of air quantity and flame measuring device, belong to boiler combustion detection technical field, including flame measurement component, air pressure measurement component and measurement box;The flame measurement component is double-layer structure, including inner cylinder and outer sleeve, the inner cylinder is placed optical fiber, outer sleeve outside adheres secondary air outlet air pipe to take wind pipe, and located in the secondary air blast box short air pressure sampling tube is connected together differential pressure transmitter, measurement box calculates secondary air flow, also measures flame.The utility model can simultaneously realize the measurement of secondary air flow and flame.

Description

Technical Field

[0001] This utility model belongs to the field of boiler combustion detection technology, and in particular relates to a measuring device for air volume and flame. Background Technology

[0002] The statements in this section are merely background information related to this utility model and do not necessarily constitute prior art.

[0003] Currently, thermal power generation mainly uses pulverized coal boilers. Pulverized coal combustion requires pulverized coal and oxygen from the air. Pulverized coal and air need to be introduced separately. The air carrying pulverized coal is called primary air, which is a high-concentration mixture of pulverized coal. The mixture is mainly composed of pulverized coal, and the oxygen content in the primary air is insufficient for pulverized coal combustion. Pulverized coal combustion in a boiler requires three conditions: First, the pulverized coal mixture must be blown into the furnace through the primary air in the pipes; second, the large amount of oxygen required for pulverized coal combustion must be introduced into the furnace from the surrounding air ducts (called secondary air ducts, with a temperature of approximately 350°C), where it mixes with the pulverized coal particles; and third, there must be a continuous and stable flame and temperature.

[0004] Existing combustion detection technologies face challenges in measuring and controlling secondary airflow, as well as in detecting flame combustion characteristics. Specifically, firstly, there's the issue of secondary airflow measurement. Given the high temperature of the secondary air—350℃—it's difficult to maintain the lifespan and controllability of any electronic sensors and actuators within it. Secondly, regarding flame characteristic detection, the measuring equipment is not only exposed to the high temperature of the secondary airflow but also faces intense flame exposure at its front end, making the environment even harsher. Therefore, current flame measurement methods typically employ high-temperature resistant optical fibers or long-distance measurements. Both of these methods provide limited information and are insufficient to fully reflect flame characteristics. Utility Model Content

[0005] To address the aforementioned problems and deficiencies in the existing technology, this utility model provides an airflow and flame measurement device. It employs an air-insulated, dual-air-cooled flame measurement component and a wind pressure measurement group that uses an external cooling cylinder as a support for the secondary air pressure measurement channel to obtain the secondary air pressure in front and uses differential pressure to measure the hot air flow rate in the secondary air duct. This solution solves the problems of difficult secondary airflow measurement and difficult flame fiber optic measurement in the field of combustion measurement.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] An air volume and flame measuring device includes a flame measuring component, an air pressure measuring component, and a measuring box;

[0008] The flame measurement component has a double-layer structure, including an inner cylinder and an outer cylinder. The measuring optical fiber is placed in the inner cylinder. An air outlet and a heat insulation ring are provided in the center between the inner cylinder and the outer cylinder. A first wind pressure sampling tube is attached to the outside of the outer cylinder.

[0009] The wind pressure measurement assembly includes a first wind pressure sampling tube, a second wind pressure sampling tube, and a differential pressure transmitter. The front end of the first wind pressure sampling tube is a secondary air intake hole, which is located at the secondary air outlet of the furnace. The front end of the second wind pressure sampling tube is placed in the secondary air header. The rear ends of both the first and second wind pressure sampling tubes are connected to the differential pressure transmitter.

[0010] The measuring box includes an air volume and flame measuring unit, which is connected to a measuring optical fiber and a differential pressure transmitter.

[0011] In a further technical solution, the length of the first wind pressure sampling tube is greater than that of the second wind pressure sampling tube.

[0012] In a further technical solution, a ventilation gap is left between the front ends of the inner cylinder and the outer cylinder.

[0013] A further technical solution is to provide a cooling air inlet at the rear end of the inner cylinder.

[0014] In a further technical solution, a sealing ring is provided at the connection between the inner cylinder of the measuring cylinder and the measuring box.

[0015] A further technical solution is that an air outlet is provided at the center of the inner cylinder.

[0016] In a further technical solution, the first air pressure sampling pipe is used for sampling at the secondary air outlet, and the second air pressure sampling pipe is used for sampling at the secondary air header.

[0017] In a further technical solution, the measuring optical fiber is used to measure flame signals.

[0018] In a further technical solution, the cross-sectional area of ​​the measuring optical fiber in the inner cylinder is smaller than the cross-sectional area of ​​the inner cylinder.

[0019] In a further technical solution, the air volume and flame measurement unit is also equipped with an external communication interface to transmit the measured data to the data processing device.

[0020] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0021] The measuring device proposed in this utility model, by adopting inner and outer sleeves, not only ensures the long-term reliable operation of the inner tube measuring optical fiber, but also provides the measurement of high-temperature secondary air volume, filling a technological gap and laying the foundation for the fine-tuning of boiler combustion. It has significant technological breakthrough significance and economic value.

[0022] The advantages of this invention in additional aspects will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0023] The accompanying drawings, which form part of this specification, are used to provide a further understanding of this utility model. The illustrative embodiments of this utility model and their descriptions are used to explain this utility model and do not constitute an improper limitation of this utility model.

[0024] Figure 1 This is an overall architecture diagram of the air volume and flame measuring device described in the embodiments of this utility model;

[0025] Among them, 1-heat insulation ring, 2-ventilation gap, 3-secondary air front end air intake hole, 4-measuring optical fiber, 5-first air pressure sampling tube, 6-second air pressure sampling tube, 7-outer sleeve, 8-inner cylinder air outlet, 9-inner cylinder, 10-sealing ring, 11-differential pressure transmitter, 12-air volume and flame measurement unit, 13-cooling air inlet. Detailed Implementation

[0026] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0027] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. It should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0028] To address the problem of direct close-range observation of flame combustion characteristics and secondary air volume, this utility model discloses an air volume and flame measurement device, including a flame measurement component, a wind pressure measurement component, and a measurement box.

[0029] The flame measurement component has a double-layer structure, including an inner cylinder 9 and an outer cylinder 7. The measuring optical fiber 4 is placed inside the inner cylinder 9. An air outlet 8 and a heat insulation ring 1 are provided in the center between the inner cylinder and the outer cylinder. A first wind pressure sampling tube 5 is attached to the outside of the outer cylinder 7.

[0030] The wind pressure measurement assembly includes a first wind pressure sampling tube 5, a second wind pressure sampling tube 6, and a differential pressure transmitter 11. The front end of the first wind pressure sampling tube 5 is a secondary air intake port 3 (P2) near the furnace, and its rear end is connected to the differential pressure transmitter 11 together with the second wind pressure sampling tube 6. The output of the differential pressure transmitter 11 is connected to the measurement box. The front end intake port (P1) of the second wind pressure sampling tube 6 is located in the secondary air header to be measured, and its rear end is connected to the differential pressure transmitter. The differential pressure transmitter is connected to the measurement box. The length of the first wind pressure sampling tube is greater than that of the second wind pressure sampling tube.

[0031] In this embodiment, the first air pressure sampling tube is used for sampling at the secondary air outlet, and the second air pressure sampling tube is used for sampling at the secondary air header.

[0032] The measuring box includes an airflow and flame measuring unit 12, which is connected to a measuring optical fiber 4 disposed in the inner cylinder. The airflow and flame measuring unit is used to measure airflow and flame characteristics, and any existing measuring detector can be used; no limitation is made here.

[0033] Furthermore, the length of the first wind pressure sampling tube 5 is greater than that of the second wind pressure sampling tube 6.

[0034] Furthermore, the measuring optical fiber 4 is used to measure the flame signal.

[0035] Furthermore, a heat insulation ring 1 is provided at the central position between the inner cylinder and the outer cylinder, and an inner cylinder air outlet 8 is provided on the inner cylinder. In addition to its heat insulation function, the heat insulation ring also serves to support the inner and outer cylinders.

[0036] Furthermore, the inner cylinder 9 and the outer cylinder 7 are provided with a ventilation gap 2 at their front ends, which blocks the heat conduction between the inner and outer cylinders and removes heat, ensuring the continuous and reliable operation of the optical fiber in a high-temperature environment.

[0037] Furthermore, the cross-section of the measuring optical fiber 4 in the inner cylinder is smaller than that of the inner cylinder, meaning there is a certain gap between the optical fiber inside the front end of the inner cylinder and the inner cylinder. The cooling air of the inner cylinder flows out from the front end of the inner cylinder through this gap, ensuring the constant temperature of the inner tube.

[0038] Preferably, the airflow and flame measurement unit in the measuring chamber includes a photoelectric sensor. The optical fiber in the inner cylinder is connected to the photoelectric sensor inside the measuring chamber after passing through a sealing ring at its rear end. This connection can be used to detect characteristics such as changes in flame intensity. It should be noted that the photoelectric sensor is part of the measuring circuit within the measuring chamber and does not involve any software program improvements.

[0039] Furthermore, the rear ends of both the long and short sampling tubes of the aforementioned secondary wind pressure measurement component are connected to an external differential pressure transmitter. The output signal of the differential pressure transmitter is connected to the measurement box. The air volume and flame measurement units in the measurement box can realize secondary air flow measurement through voltage sampling, A / D conversion, and Bernoulli equation calculation by the microprocessor MCU, or directly transmit the measurement data to external devices for calculation and processing.

[0040] Furthermore, the rear end of the aforementioned inner cylinder 9 is provided with a cooling air inlet 13.

[0041] In this embodiment, the cooling air of the outer cylinder is obtained through the air outlet of the inner cylinder at the center.

[0042] Preferably, the airflow of the inner cylinder can be controlled by the external design of the fiber optic front end, ensuring that most of the cooling air flows through the inner cylinder, so that the airflow of the inner and outer layers does not exceed 1 / 3 of the total airflow.

[0043] Furthermore, a sealing ring 10 is provided at the connection between the inner cylinder of the measuring cylinder and the measuring box to prevent cooling air from leaking into the measuring box.

[0044] Preferably, the air volume and flame measurement unit is also provided with an external communication interface for transmitting the measured data to a computer or other data processing device.

[0045] It should be understood that a space is usually reserved on the outer wall of the boiler's secondary air duct. If no space is reserved, a hole can be drilled on site to allow this device to pass through the outer wall of the boiler's secondary air duct.

[0046] As an implementable method, the wind and fire simultaneous measurement device proposed in this utility model can follow the following working principle:

[0047] The principle of secondary air flow measurement follows the principle of orifice flow measurement in fluid mechanics. Below is the publicly available classic formula for calculating orifice flow:

[0048]

[0049] In the formula, q m For the mass calculation formula, q v Here is the volume calculation formula, where d is the diameter of the throttling orifice (secondary air duct), a parameter that is determined after the device design is completed, and ρ is the density of the hot secondary air.

[0050] Therefore, once ΔP is obtained, the secondary airflow can be measured.

[0051] ΔP = P1 - P2 is obtained by measuring the two sampling tubes and the measuring unit of this device. The key to this invention is the design of a secondary air sampling tube on the measuring cylinder.

[0052] Although the specific embodiments of the present utility model have been described above in conjunction with the accompanying drawings, this is not intended to limit the scope of protection of the present utility model. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without creative effort based on the technical solution of the present utility model are still within the scope of protection of the present utility model.

Claims

1. A device for measuring air volume and flame, characterized in that, Includes flame measurement components, wind pressure measurement components, and measurement boxes; The flame measurement component has a double-layer structure, including an inner cylinder and an outer cylinder. The measuring optical fiber is placed in the inner cylinder. An air outlet and a heat insulation ring are provided in the center between the inner cylinder and the outer cylinder. A first wind pressure sampling tube is attached to the outside of the outer cylinder. The wind pressure measurement assembly includes a first wind pressure sampling tube, a second wind pressure sampling tube, and a differential pressure transmitter. The front end of the first wind pressure sampling tube is a secondary air intake hole, which is located at the secondary air outlet of the furnace. The front end of the second wind pressure sampling tube is placed in the secondary air header. The rear ends of both the first and second wind pressure sampling tubes are connected to the differential pressure transmitter. The measuring box includes an air volume and flame measuring unit, which is connected to a measuring optical fiber and a differential pressure transmitter.

2. The air volume and flame measuring device as described in claim 1, characterized in that, The length of the first wind pressure sampling tube is greater than that of the second wind pressure sampling tube.

3. The air volume and flame measuring device as described in claim 1, characterized in that, A ventilation gap is provided between the front ends of the inner cylinder and the outer cylinder.

4. The air volume and flame measuring device as described in claim 1, characterized in that, The inner cylinder is provided with a cooling air inlet at its rear end.

5. The air volume and flame measuring device as described in claim 1, characterized in that, A sealing ring is provided at the connection between the inner cylinder and the measuring box.

6. The air volume and flame measuring device as described in claim 1, characterized in that, An air outlet is provided in the center of the inner cylinder.

7. The air volume and flame measuring device as described in claim 1, characterized in that, The first air pressure sampling tube is used for sampling at the secondary air outlet, and the second air pressure sampling tube is used for sampling at the secondary air header.

8. The air volume and flame measuring device as described in claim 1, characterized in that, The measuring optical fiber is used to measure flame signals.

9. The air volume and flame measuring device as described in claim 1, characterized in that, The cross-section of the measuring optical fiber in the inner cylinder is smaller than the cross-section of the inner cylinder.

10. The air volume and flame measuring device as described in claim 1, characterized in that, The air volume and flame measurement unit is also equipped with an external communication interface to transmit the measured data to the data processing device.

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