CN212409368U

CN212409368U - Temperature control system in flue gas hood of sintering machine

Info

Publication number: CN212409368U
Application number: CN202021308889.7U
Authority: CN
Inventors: 吕庆; 张巍
Original assignee: MCC North Dalian Engineering Technology Co Ltd
Current assignee: MCC North Dalian Engineering Technology Co Ltd; Northern Engineering and Technology Corp MCC
Priority date: 2020-07-07
Filing date: 2020-07-07
Publication date: 2021-01-26
Anticipated expiration: 2030-07-07

Abstract

The utility model relates to a temperature control system in sintering machine flue gas cover, including flue gas cover, air inlet regulating valve, air-out pipeline and control system, its characterized in that, control system include thermometer I, thermometer II, logic controller and computer software system, thermometer I sets up in flue gas cover air inlet regulating valve below, thermometer II sets up in the air-out pipeline, logic controller and thermometer I, thermometer II and air inlet regulating valve electrical property link to each other, computer software system and logic controller electrical property link to each other; the computer software system comprises an air outlet temperature function fitting unit, a cover temperature target value calculating unit and an adjusting valve opening calculating unit. The utility model has the advantages that: through the regulation control of the regulating valve and the combination of multi-point detection and comprehensive analysis algorithm, the refined intelligent control of the temperature in the flue gas hood is realized, the quality of sinter ore is improved, the heat loss of circulating flue gas is reduced, and the energy conservation, emission reduction and consumption reduction are realized.

Description

Temperature control system in flue gas hood of sintering machine

Technical Field

The utility model belongs to the technical field of industrial computer real-time control, concretely relates to temperature control system in sintering machine flue gas cover.

Background

The traditional sintering production has the characteristics of large waste gas amount, serious pollution load, various pollutants and the like, and the sintering flue gas circulation technology can well solve the problem. The flue gas circulation is a process of circularly recovering and recycling the flue gas discharged in the sintering process, and the amount of the circulating flue gas accounts for 20-30% of the total discharge amount. The technology not only reduces the total smoke discharge amount of sintering production and heat loss, but also enables the nitrogen oxides and the sulfur oxides to generate secondary chemical reaction in the smoke circulation process, converts part of harmful substances into harmless substances and reduces the discharge of the harmful substances. The flue gas hood of the sintering machine is arranged above the sintering machine trolley to form a closed space for flue gas to flow circularly, and is an important component of flue gas circulation. Under the action of the circulating fan, sintering flue gas enters the flue gas hood from the air inlet pipeline, then passes through sintering raw materials in the trolley to enter the air outlet pipeline, and finally flows back to the air inlet pipeline from part of the air outlet pipeline, so that a flue gas circulating process is completed. It is particularly important to maintain the temperature in the hood stable during the flue gas circulation: too low a temperature causes loss of precious circulating heat, increases consumption of fossil fuel in the sintering process, and also increases sintering pollution; too high temperature can cause the influence to the subsequent flue gas desulfurization of sintering, denitration workshop section, can directly destroy the production facility of subsequent workshop section when serious and cause economic loss difficult to retrieve. Therefore, the fine control of the temperature stability in the flue gas hood is a difficult problem to be solved urgently in sintering production.

Disclosure of Invention

To the above-mentioned problem that exists among the prior art, the utility model aims to provide a temperature control system in sintering machine flue gas cover, this system passes through the regulation control of flue gas cover governing valve, combines multiple spot detection and comprehensive analysis algorithm based on PLC, realizes the intelligent control that becomes more meticulous of temperature in the sintering machine flue gas cover, and this kind of control mode has reduced the heat loss of circulation flue gas, has reduced fossil fuel's consumption, reaches energy saving and emission reduction's effect.

The utility model aims at realizing through the following technical scheme:

the utility model discloses a temperature control system in sintering machine flue gas cover, including the platform truck, set up flue gas cover above the platform truck, set up the adjusting pipe that admits air at the flue gas cover top, set up the governing valve that admits air in the adjusting pipe upper end, set up air-out pipeline and control system below the platform truck, the air-out pipeline correspond flue gas cover order and set up below the platform truck, be equipped with 10 ~ 15 altogether, its characterized in that, control system be intelligent control system, including thermometer I, thermometer II, logic controller and computer software system, thermometer I set up in flue gas cover each group admit air below the adjusting pipe, thermometer II set up in the air-out pipeline; the logic controller is electrically connected with the thermometer I, the thermometer II and the air inlet regulating valve, and the computer software system is electrically connected with the logic controller;

the computer software system comprises an air-out temperature function fitting unit, a cover internal temperature target value calculating unit and an adjusting valve opening calculating unit, wherein the input end of the air-out temperature function fitting unit is connected with the output end of the logic controller, the output end of the air-out temperature function fitting unit is connected with the input end of the cover internal temperature target value calculating unit, the output end of the cover internal temperature target value calculating unit is connected with the input end of the adjusting valve opening calculating unit, and the output end of the adjusting valve opening calculating unit is connected with the input end of the logic controller.

Every two of the air inlet adjusting pipes are a group, 4-6 groups are arranged in total, and the groups are arranged at the top of the flue gas hood at equal intervals.

The outlet air temperature function fitting unit is used for calculating and determining an outlet air temperature function F (x); the cover temperature target value calculation unit is used for calculating and determining a target value T of a cover temperature table I_o(ii) a The regulating valve opening calculating unit is used for calculating and determining the opening H of the two air inlet regulating valves a and b in the combination_aAnd H_b。

Compared with the prior art, the utility model has the advantages that:

the utility model discloses a flue gas cover governing valve's regulation and control combines multiple spot detection and comprehensive analysis algorithm based on PLC, realizes the intelligent control that becomes more meticulous of temperature in the sintering machine flue gas cover, and this kind of control mode has reduced the heat loss of circulation flue gas, has reduced fossil fuel's consumption, reaches energy saving and emission reduction's effect.

Drawings

FIG. 1 is a schematic view of a control system of the present invention;

FIG. 2 is a schematic cross-sectional view of FIG. 1;

fig. 3 is a block diagram of the computer software system of the present invention.

Detailed Description

For a clear, detailed and complete description of the present invention, reference is made to the accompanying drawings and detailed description of the invention.

As shown in figures 1 and 2, the temperature control system in the flue gas hood of the sintering machine of the utility model comprises a trolley 1, a flue gas hood 2 arranged above the trolley 1, an air inlet adjusting pipe 3 arranged at the top of the flue gas hood 2, an air inlet adjusting valve 4 arranged at the upper end of the air inlet adjusting pipe 3, an air outlet pipeline 6 arranged below the trolley 1 and a control system, the two air inlet adjusting pipes 3 are divided into one group, 6 groups are arranged in total, all the groups are arranged at the top of the flue gas hood 2 at equal intervals, the air outlet pipeline 6 is arranged below the trolley 1 in sequence corresponding to the smoke hoods, and is provided with 14 smoke hoods, the control system is an intelligent control system and comprises a temperature table I5, a temperature table II 7, a logic controller and a computer software system, the thermometer I5 is arranged below each group of air inlet adjusting pipes 3 in the flue gas hood 2, and the thermometer II 7 is arranged in the air outlet pipeline 6; the logic controller is electrically connected with the temperature meter I5, the temperature meter II 7 and the air inlet regulating valve 4, and the computer software system is electrically connected with the logic controller.

As shown in fig. 3, the computer software system includes an outlet air temperature function fitting unit, a hood temperature target value calculating unit, and an adjusting valve opening calculating unit, wherein an input end of the outlet air temperature function fitting unit is connected to an output end of the logic controller, an output end of the outlet air temperature function fitting unit is connected to an input end of the hood temperature target value calculating unit, an output end of the hood temperature target value calculating unit is connected to an input end of the adjusting valve opening calculating unit, and an output end of the adjusting valve opening calculating unit is connected to an input end of the logic controller.

The reaction modes of the sintering raw materials at different stages in the sintering process are different, the more the sintering raw materials are close to the tail part of the sintering machine along the traveling direction of the trolley 1, the more violent the reaction is, and the higher the temperature of the circulating flue gas passing through the materials is. A reasonable temperature control result in the flue gas cover 2 is to control the temperature of the flue gas in the flue gas cover 2 to a specific continuous function distribution curve along the traveling direction of the trolley 1. Based on the design of the air inlet adjusting valve 4, a continuous space can be divided into a plurality of sections of control areas, and the control areas are respectively and independently controlled to finally achieve the control target of the temperature continuous distribution curve in the cover.

The temperature control of each section of control area in the flue gas cover 2 is realized by a top air inlet adjusting valve 4. Because the smoke pressure in the smoke hood 2 is negative pressure during normal production, the external air can be pumped into the smoke hood 2 when the air inlet adjusting valve 4 is opened. Therefore, the larger the opening value of the air inlet adjusting valve 4 is, the lower the temperature of the area nearby in the flue gas hood 2 is; the smaller the opening value of the air inlet adjusting valve 4 is, the higher the temperature of the nearby area in the smoke cover 2 is. Through all air inlet governing valves 4 to on the flue gas cover 2 carry out the adjustment of different apertures, can realize the accurate control of temperature in the flue gas cover 2.

Claims

1. A temperature control system in a flue gas hood of a sintering machine comprises a trolley, a flue gas hood arranged above the trolley, an air outlet pipeline arranged below the trolley, a logic controller and a computer software system, and is characterized in that a plurality of groups of air inlet adjusting pipes are arranged at the top of the flue gas hood at equal intervals, an air inlet adjusting valve is arranged at the upper end of each air inlet adjusting pipe, a thermometer I is arranged below each group of air inlet adjusting pipes in the flue gas hood, a thermometer II is arranged in the air outlet pipeline, the thermometer I, the thermometer II and the air inlet adjusting valves are electrically connected with the logic controller, and the computer software system is electrically connected with the logic controller;

2. The system for controlling the temperature in the flue gas hood of the sintering machine according to claim 1, wherein every two inlet adjusting pipes are in one group, 4-6 groups are arranged in total, and the groups are arranged at the top of the flue gas hood at equal intervals.

3. The system for controlling the temperature in the flue gas hood of the sintering machine according to claim 1, wherein 10-15 air outlet pipelines are arranged.

4. The system for controlling the temperature in the flue gas hood of the sintering machine according to claim 1, wherein the outlet air temperature function fitting unit is used for calculating and determining an outlet air temperature function F (x); the cover temperature target value calculation unit is used for calculating and determining a target value T of a cover temperature table I_o(ii) a The regulating valve opening calculating unit is used for calculating and determining the opening H of the two air inlet regulating valves a and b in the combination_aAnd H_b。