阅读说明：本技术 一种冶炼烟气制酸转化检测系统 (Smelting flue gas acid making conversion detection system ) 是由 朱保义 沈岑宽 陈华勇 吴国庆 王武钧 卢山龙 任永刚 胡磊 于 2019-09-16 设计创作，主要内容包括：本发明公开一种冶炼烟气制酸转化检测系统,包括输送风机、第一检测探头、空气加热器、第二检测探头、第一触媒转化系统、第三检测探头与第二触媒转化系统；本发明在工作时,当输送风机输入的烟气中二氧化硫浓度值较大时,通过将部分烟气与干燥热空气均匀混合后再通入第一触媒转化系统进行反应,再通过混合反应后的烟气稀释输送风机输入的另一部分烟气,从而充分利用了第一触媒转化系统中的反应热,同时减少了引入的空气量,降低了冶炼废气的处理量,降低加热空气所需的能源损耗,充分利用二氧化硫转化为三氧化硫过程中的反应热。(The invention discloses a smelting flue gas acid making conversion detection system, which comprises a conveying fan, a first detection probe, an air heater, a second detection probe, a first catalyst conversion system, a third detection probe and a second catalyst conversion system, wherein the conveying fan is connected with the first detection probe; when the method works, when the concentration value of sulfur dioxide in the flue gas input by the conveying fan is larger, part of the flue gas is uniformly mixed with dry hot air and then introduced into the first catalyst conversion system for reaction, and the flue gas after the mixed reaction dilutes the other part of the flue gas input by the conveying fan, so that the reaction heat in the first catalyst conversion system is fully utilized, the introduced air quantity is reduced, the treatment capacity of waste gas smelting is reduced, the energy loss required by air heating is reduced, and the reaction heat in the process of converting sulfur dioxide into sulfur trioxide is fully utilized.)

1. A smelting flue gas acid making conversion detection system is characterized by comprising a conveying fan, a first detection probe, an air heater, a second detection probe, a first catalyst conversion system, a third detection probe and a second catalyst conversion system;

the conveying fan is used for inputting the smelting flue gas subjected to dust removal treatment into a flue gas acid making conversion detection system, and the smelting flue gas input by the conveying fan is directly input into a second catalyst conversion system after being detected by a first detection probe or is partially transferred into a pipeline between an air heater and a second detection probe;

the air heater is a heat exchanger with an electric heating function and used for heating dry air, and the heated air is uniformly mixed with flue gas input by the conveying fan, detected by the second detection probe and transmitted to the first catalyst conversion system or the second catalyst conversion system;

the first catalyst conversion system and the second catalyst conversion system convert sulfur dioxide into sulfur trioxide by a catalyst contact method;

the flue gas obtained by the reaction of the first catalyst conversion system is directly detected by the third detection probe and then mixed with part of the flue gas input by the conveying fan to enter the second catalyst conversion system, or is subjected to heat exchange by the air heater and then mixed with part of the flue gas input by the conveying fan through the third detection probe to enter the second catalyst conversion system.

2. The system for detecting conversion of acid production from smelting flue gas as recited in claim 1, wherein the first detection probe comprises a first sulfur dioxide sensor and a first flow rate sensor, the first sulfur dioxide sensor is used for detecting a concentration value S1 of sulfur dioxide in flue gas input by the conveying fan, the first flow rate sensor is used for detecting a flow rate of flue gas entering the system for detecting conversion of acid production from flue gas, and the flow rate Q1 of flue gas entering the system is calculated through the flow rate and a pipe diameter.

3. The system of claim 2, wherein when the sulfur dioxide concentration value S1 detected by the first sulfur dioxide sensor is less than or equal to the preset value S, all of the flue gas is directly conveyed to the second catalytic conversion system, and when the sulfur dioxide concentration value S1 detected by the first sulfur dioxide sensor is greater than the preset value S, a part of the flue gas is conveyed to a pipeline between the air heater and the second detection probe through the pipeline, and the rest of the flue gas directly enters the second catalytic conversion system.

4. The system of claim 1, wherein the second detection probe comprises a second sulfur dioxide concentration sensor and a second flow rate sensor, the second sulfur dioxide sensor is used for detecting a sulfur dioxide concentration value S2 in the diluted flue gas, the second flow rate sensor is used for detecting a flue gas flow rate between the air heater and the first catalytic conversion system, and the flow rate and the pipe diameter are used for calculating to obtain a flow rate Q2 of the flue gas entering the first catalytic conversion system.

5. The system of claim 1, wherein the first catalytic conversion system and the second catalytic conversion system are both provided with a temperature sensor for detecting the temperature of the flue gas entering the catalytic conversion system and the temperature of the flue gas after conversion, wherein the temperature of the flue gas entering the first catalytic conversion system is W1, the temperature of the flue gas leaving the first catalytic conversion system after reaction is W2, the temperature of the flue gas entering the second catalytic conversion system is W3, and the temperature of the flue gas leaving the first catalytic conversion system after reaction is W4.

6. The system of claim 1, wherein the flue gas from the first catalytic conversion system is first mixed with the heated dry hot air by the air heater and diluted to a concentration of S3, wherein S3 is a concentration of sulfur dioxide in the flue gas that can make the first catalytic conversion system in a thermal equilibrium state.

7. The system of claim 1, wherein the flue gas generated by the reaction of the first catalytic conversion system is completely and uniformly mixed with a part of the flue gas input by the conveying fan through the third detection probe and then enters the second catalytic conversion system or a part of the flue gas enters the air heater for heat exchange, the other part of the flue gas is uniformly mixed with a part of the flue gas input by the conveying fan through the third detection probe and then enters the second catalytic conversion system, and the flue gas input by the conveying fan is diluted and heated by the flue gas generated by the reaction of the first catalytic conversion system.

8. The system for detecting conversion of acid production from smelting flue gas according to claim 7, when the oxygen-sulfur ratio of the mixed flue gas of the flue gas after the reaction of the first catalyst conversion system and the flue gas input by the conveying fan is less than 0.7, the oxygen-sulfur ratio of the flue gas entering the second catalytic conversion system is adjusted by the dry air heated by the input part of the air heater, so that the oxygen-sulfur ratio is not less than 0.7, when the flue gas is introduced into the first catalyst conversion system for reaction and then mixed with the flue gas input by the conveying fan, the temperature of the mixed flue gas required by the reaction can be reached, and the oxygen-sulfur ratio is not less than 0.7, the first catalyst conversion system transmits part of the flue gas after the reaction of the first catalyst conversion system to the air heater for heat exchange, and the flue gas after the heat exchange is mixed with the flue gas after the reaction of the other part of the first catalyst conversion system and then enters the second catalyst conversion system for reaction.

Technical Field

The invention belongs to the technical field of acid making from flue gas, and particularly relates to a conversion detection system for acid making from smelting flue gas.

Background

Sulfuric acid is an important chemical product and is widely applied to the fields of chemical industry, medicine, smelting and the like, the preparation process of the sulfuric acid comprises various methods of preparing acid by using sulfur, preparing acid by using pyrite, preparing acid by using smelting flue gas and the like, wherein in the process of preparing acid by using the smelting flue gas, the flue gas containing a large amount of sulfur dioxide and generated in the smelting process of a smelting raw material containing metal sulfide is used as a raw material, the sulfur dioxide in the flue gas is recovered to produce the sulfuric acid, the utilization efficiency of resources can be improved, and sulfur-containing pollutants in the flue gas discharged by smelting can be reduced.

In the prior art, in the process of making acid by smelting flue gas, sulfur dioxide gas is converted into sulfur trioxide, and then sulfuric acid is generated by reacting sulfur trioxide with water, wherein the conversion of sulfur dioxide into sulfur trioxide is an exothermic reaction, and the whole reaction needs to be carried out in a high-temperature environment, so that in the actual production process, heat balance can be realized only when the concentration of sulfur dioxide in the flue gas reaches a certain value, when the concentration of sulfur dioxide in the flue gas is too low, the reaction heat is not enough to maintain the reaction temperature, so that external supplementary heat is needed for reaction, when the concentration of sulfur dioxide in the flue gas is too high, a conversion device for converting sulfur dioxide into sulfur trioxide cannot realize sufficient conversion, so that a large amount of air needs to be introduced for dilution, the flue gas treatment capacity is improved, the heat recovery rate in the treated flue gas is reduced, and a large amount of energy needs to be spent, how to change the production path of the flue gas acid making according to the concentration value of sulfur dioxide contained in the flue gas, reduce the production loss and improve the production efficiency, in order to solve the problem, the invention provides the following technical scheme.

Disclosure of Invention

The invention aims to provide a conversion detection system for acid making from smelting flue gas.

The technical problems to be solved by the invention are as follows:

in the in-process through smelting flue gas system acid, if sulfur dioxide concentration in the pending flue gas is low excessively, can lead to the exothermic unable reaction condition that supports of catalytic reaction, and when sulfur dioxide's concentration was too high, can lead to the oxysulfide in the flue gas to support sulfur dioxide's oxidation reaction than unable, lead to the sulfur dioxide of conversion equipment in can't be totally with the flue gas and turn into sulfur trioxide, consequently contain the untreated sulfur dioxide of higher concentration in the emission flue gas after handling, and carry out the mode of diluting through letting in a large amount of air among the prior art and promoted the flue gas volume of pending greatly, need consume a large amount of energy simultaneously and heat the air of joining, thereby manufacturing cost has been promoted.

The purpose of the invention can be realized by the following technical scheme:

a smelting flue gas acid making conversion detection system comprises a conveying fan, a first detection probe, an air heater, a second detection probe, a first catalyst conversion system, a third detection probe and a second catalyst conversion system;

the conveying fan is used for inputting the smelting flue gas subjected to dust removal treatment into a flue gas acid making conversion detection system, and the smelting flue gas input by the conveying fan is directly input into a second catalyst conversion system after being detected by a first detection probe or is partially transferred into a pipeline between an air heater and a second detection probe;

the air heater is a heat exchanger with an electric heating function and used for heating dry air, and the heated air is uniformly mixed with flue gas input by the conveying fan, detected by the second detection probe and transmitted to the first catalyst conversion system or the second catalyst conversion system;

the first catalyst conversion system and the second catalyst conversion system convert sulfur dioxide into sulfur trioxide by a catalyst contact method;

the flue gas obtained by the reaction of the first catalyst conversion system is directly detected by the third detection probe and then mixed with part of the flue gas input by the conveying fan, and then enters the second catalyst conversion system, or is subjected to heat exchange by the air heater, then is mixed with part of the flue gas input by the conveying fan by the third detection probe and then enters the second catalyst conversion system.

As a further scheme of the invention, the first detection probe comprises a first sulfur dioxide sensor and a first flow velocity sensor, the first sulfur dioxide sensor is used for detecting a concentration value S1 of sulfur dioxide in flue gas input by the conveying fan, the first flow velocity sensor is used for detecting a flow velocity of the flue gas entering the flue gas acid making conversion detection system, and the flow Q1 of the flue gas entering the system is obtained through calculation of the flow velocity and the pipe diameter.

As a further scheme of the invention, when the sulfur dioxide concentration value S1 detected by the first sulfur dioxide sensor is less than or equal to a preset value S, all the flue gas is directly conveyed to enter the second catalytic conversion system, when the sulfur dioxide concentration value S1 detected by the first sulfur dioxide sensor is greater than the preset value S, part of the flue gas is conveyed to enter a pipeline between the air heater and the second detection probe through the pipeline, and the rest of the flue gas directly enters the second catalytic conversion system.

As a further scheme of the present invention, the second detection probe includes a second sulfur dioxide concentration sensor and a second flow rate sensor, wherein the second sulfur dioxide sensor is configured to detect a sulfur dioxide concentration value S2 in the diluted flue gas, and the second flow rate sensor is configured to detect a flue gas flow rate between the air heater and the first catalytic conversion system, and calculate a flow rate Q2 of the flue gas entering the first catalytic conversion system through the flow rate and the pipe diameter.

As a further aspect of the present invention, temperature sensors are installed in both the first catalytic conversion system and the second catalytic conversion system, and are used for detecting the temperature of the flue gas entering the catalytic conversion system and the temperature of the flue gas after conversion, where the temperature of the flue gas entering the first catalytic conversion system is W1, the temperature of the flue gas leaving the first catalytic conversion system after reaction is W2, the temperature of the flue gas entering the second catalytic conversion system is W3, and the temperature of the flue gas leaving the first catalytic conversion system after reaction is W4.

As a further scheme of the invention, the flue gas entering the first catalytic conversion system from the conveying fan is firstly uniformly mixed with the dry hot air heated by the air heater and diluted to a concentration of S3, wherein S3 is the concentration value of sulfur dioxide in the flue gas which can enable the first catalytic conversion system to be in a thermal equilibrium state.

As a further scheme of the invention, the flue gas after the reaction of the first catalytic conversion system is completely and uniformly mixed with part of the flue gas input by the conveying fan through the third detection probe and then enters the second catalytic conversion system or one part of the flue gas enters the air heater for heat exchange, the other part of the flue gas after the reaction of the first catalytic conversion system is uniformly mixed with part of the flue gas input by the conveying fan through the third detection probe and then enters the second catalytic conversion system, and the flue gas input by the conveying fan is diluted and heated by the flue gas after the reaction of the first catalytic conversion system

As a further scheme of the invention, when the oxygen-sulfur ratio of the mixed flue gas of the flue gas after the reaction of the first catalytic conversion system and the flue gas input by the conveying fan is less than 0.7, the oxygen-sulfur ratio of the flue gas entering the second catalytic conversion system is adjusted by the dry air heated by the input part of the air heater, so that the oxygen-sulfur ratio is not less than 0.7, when only part of the flue gas after the reaction of the first catalytic conversion system is introduced and mixed with the flue gas input by the conveying fan, the mixed flue gas can reach the temperature required by the reaction and the oxygen-sulfur ratio is not less than 0.7, the first catalytic conversion system transmits part of the flue gas after the reaction of the first catalytic conversion system into the air heater for heat exchange, and the flue gas after the heat exchange and the flue gas after the reaction of the other part of the first catalytic conversion system enter the second catalytic conversion system for.

The invention has the beneficial effects that:

when the invention works, when the concentration value of sulfur dioxide in the flue gas input by the conveying fan is larger, part of the flue gas is uniformly mixed with dry hot air and then introduced into the first catalyst conversion system for reaction, and the flue gas after the mixed reaction dilutes the other part of the flue gas input by the conveying fan, so that the reaction heat in the first catalyst conversion system is fully utilized, the introduced air quantity is reduced, the energy consumption required by heating air is reduced, and the reaction heat is fully utilized.

Drawings

The invention is described in further detail below with reference to the figures and specific embodiments.

FIG. 1 is a schematic diagram of the smelting flue gas acid-making conversion detection system.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

A smelting flue gas acid making conversion detection system is shown in figure 1 and comprises a conveying fan, a first detection probe, an air heater, a second detection probe, a first catalyst conversion system, a third detection probe and a second catalyst conversion system;

the conveying fan is used for inputting the smelting flue gas subjected to dust removal treatment into a flue gas acid making conversion detection system, and the smelting flue gas input by the conveying fan is directly input into a second catalyst conversion system after being detected by a first detection probe or is partially transferred into a pipeline between an air heater and a second detection probe;

the first detection probe comprises a first sulfur dioxide sensor and a first flow velocity sensor, wherein the first sulfur dioxide sensor is used for detecting a concentration value S1 of sulfur dioxide in flue gas input by a conveying fan, the first flow velocity sensor is used for detecting the flow velocity of the flue gas entering the flue gas acid-making conversion detection system and calculating the flow Q1 of the flue gas entering the system through the flow velocity and the pipe diameter, when the sulfur dioxide concentration value S1 detected by the first sulfur dioxide sensor is less than or equal to a preset value S, all the flue gas is directly conveyed to enter the second catalyst conversion system, when the sulfur dioxide concentration value S1 detected by the first sulfur dioxide sensor is greater than the preset value S, part of the flue gas is conveyed to enter a pipeline between the air heater and the second detection probe through the pipeline, and part of the flue gas directly enters the second catalyst;

the air heater is a heat exchanger with an electric heating function and used for heating dry air, and the heated air is uniformly mixed with flue gas input by the conveying fan, detected by the second detection probe and transmitted to the first catalyst conversion system or the second catalyst conversion system;

the second detection probe comprises a second sulfur dioxide concentration sensor and a second flow rate sensor, wherein the second sulfur dioxide sensor is used for detecting a sulfur dioxide concentration value S2 in the diluted flue gas, the second flow rate sensor is used for detecting the flue gas flow rate between the air heater and the first catalytic conversion system, and the flow rate Q2 of the flue gas entering the first catalytic conversion system is obtained through calculation of the flow rate and the pipe diameter;

the first catalyst conversion system and the second catalyst conversion system convert sulfur dioxide into sulfur trioxide by a catalyst contact method, temperature sensors are arranged in the first catalyst conversion system and the second catalyst conversion system and used for detecting the temperature of flue gas entering the catalyst conversion systems and the temperature of the flue gas after conversion, wherein the temperature of the flue gas entering the first catalyst conversion system is W1, the temperature of the flue gas leaving the first catalyst conversion system after reaction is W2, the temperature of the flue gas entering the second catalyst conversion system is W3, and the temperature of the flue gas leaving the first catalyst conversion system after reaction is W4;

the temperature of the gas after reaction and conversion by the first catalyst conversion system rises, and the flue gas obtained by reaction is directly detected by a third detection probe and then mixed with part of the flue gas input by the conveying fan, and then enters a second catalyst conversion system or is subjected to heat exchange by an air heater, then is mixed with part of the flue gas input by the conveying fan by the third detection probe and then enters the second catalyst conversion system;

the specific working method of the smelting flue gas acid making conversion detection system comprises the following steps:

s1, detecting by the first detection probe to obtain that the concentration of sulfur dioxide in the flue gas is S1 and the flow rate of the flue gas is Q1, comparing S1 with a preset value S, if S1 is less than or equal to S, completely allowing the flue gas to enter the second catalyst conversion system for reaction, and if S1 is more than S, controlling part of the flue gas to enter the first catalyst conversion system from the conveying fan through a valve;

s2, uniformly mixing and diluting the flue gas entering the first catalyst conversion system from the conveying fan and the heated dry hot air of the air heater to a concentration of S3, wherein S3 is a sulfur dioxide concentration value in the flue gas which enables the first catalyst conversion system to be in a thermal equilibrium state (namely the catalyst reaction heat can maintain the temperature required by the reaction), after the reaction, the sulfur dioxide in the first catalyst conversion system is fully converted into sulfur trioxide, and simultaneously, the flue gas after the reaction also contains a large amount of unreacted oxygen;

s3, enabling one part of the flue gas after the reaction of the first catalyst conversion system to enter an air heater for heat exchange, enabling the other part of the flue gas to enter a second catalyst conversion system after being uniformly mixed with part of the flue gas input by a conveying fan through a third detection probe, diluting and heating the flue gas input by the conveying fan through the flue gas after the reaction of the first catalyst conversion system, reducing the amount of cold air introduced by the system, fully utilizing the heat in the flue gas after the reaction of the first catalyst conversion system, improving the energy utilization efficiency and reducing the waste of energy;

s4, when the oxygen-sulfur ratio of the mixed flue gas of the flue gas after the reaction of the first catalyst conversion system and the flue gas input by the conveying fan is less than 0.7, the oxygen-sulfur ratio of the flue gas entering the second catalyst conversion system is adjusted by the dry air heated by the input part of the air heater, so that the oxygen-sulfur ratio is not less than 0.7, when only part of the flue gas after the reaction of the first catalyst conversion system is introduced and mixed with the flue gas input by the conveying fan, the mixed flue gas can reach the temperature required by the reaction and the oxygen-sulfur ratio is not less than 0.7, the first catalyst conversion system transmits part of the flue gas after the reaction of the first catalyst conversion system to enter the air heater for heat exchange, and the flue gas after the heat exchange and the flue gas after the reaction of the other part of the first catalyst conversion system enter the second catalyst conversion system.

The foregoing is merely exemplary and illustrative of the present invention and various modifications, additions and substitutions may be made by those skilled in the art to the specific embodiments described without departing from the scope of the invention as defined in the following claims.