CN116337938A - Blast furnace gas calorific value soft measurement method and device based on gas preheating - Google Patents

Abstract

The invention discloses a method and device for soft measurement of blast furnace gas calorific value based on gas preheating, wherein the method includes: acquiring real-time operating parameter data of the combustion and flue gas system; wherein the operating parameter data includes: flue gas oxygen content , the gas side inlet temperature of the gas preheater, the gas side outlet temperature of the gas preheater, the flue gas side inlet temperature of the gas preheater, and the flue gas side outlet temperature of the gas preheater; the operating parameter data are preprocessed to obtain the solution for the gas Effective data of calorific value; calculate the flue gas enthalpy value and gas enthalpy value under the heat transfer parameters of the inlet and outlet of the gas preheater according to the effective data of the gas calorific value, calculate the solution coefficient according to the oxygen content of the flue gas, and calculate the solution coefficient according to the flue gas enthalpy value, gas enthalpy value and solution coefficient to calculate the low heat value of gas. It can be used for on-line monitoring of calorific value of steel rolling heating furnace, blast furnace hot blast stove and gas boiler, and has strong practical significance.

Description

Blast furnace gas calorific value soft measurement method and device based on gas preheating

technical field

The invention relates to the technical field of gas utilization in iron and steel enterprises, in particular to a method and device for soft measurement of the calorific value of blast furnace gas based on gas preheating.

Background technique

Iron and steel enterprises produce a large amount of by-product gas during the smelting process, especially blast furnace gas. Steel mills generally recycle it through steel rolling heating furnaces, blast furnace hot blast stoves, gas boilers and other equipment. Because the calorific value of blast furnace gas is low, it is not conducive to burnout. For this reason, iron and steel enterprises generally install gas preheaters on the tail flues of heating furnaces, hot blast stoves, and gas boilers to increase the temperature of gas entering the furnace and improve gas combustion efficiency. , and the gas preheater can also recover the waste heat of the flue gas at the tail, reduce the temperature of the flue gas discharge, and improve the thermal efficiency of the system. For heating furnaces, hot blast stoves, and gas boilers, the calorific value of the furnace gas has always been a key input variable for furnace combustion control. The calorific value instrument is arranged on the gas pipeline in front of the gas boiler, which will undoubtedly bring inconvenience to the combustion control of the above-mentioned equipment.

Contents of the invention

The invention provides a blast furnace gas calorific value soft measurement method and device based on gas preheating, which can be used for on-line monitoring of the calorific value of steel rolling heating furnaces, blast furnace hot blast stoves, and gas boilers, and has strong practical significance.

The embodiment of the first aspect of the present invention provides a method for soft measurement of the calorific value of blast furnace gas based on gas preheating, including the following steps:

Obtain real-time operating parameter data of the combustion and flue gas system; wherein, the operating parameter data includes: flue gas oxygen content, gas side inlet temperature of the gas preheater, gas side outlet temperature of the gas preheater, gas preheater smoke Gas side inlet temperature, gas preheater flue gas side outlet temperature;

Preprocessing the operating parameter data to obtain effective data for solving the calorific value of the gas;

Calculate the flue gas enthalpy value of the flue gas at the inlet temperature of the flue gas side of the gas preheater and the outlet temperature of the flue gas side of the gas preheater according to the effective data of the calorific value of the gas:

Among them, H _y,1 is the enthalpy value of flue gas at θ ₁ temperature, unit is kJ/Nm ³ ; H _y,2 is the enthalpy value of flue gas at θ ₂ temperature, unit is kJ/Nm ³ ; θ ₁ is the inlet temperature of the flue gas side of the gas preheater, in °C; _θ2 is the outlet temperature of the flue gas side of the gas preheater, in °C;

Calculate the gas enthalpy value of the gas at the inlet temperature of the gas side of the gas preheater and the outlet temperature of the gas side of the gas preheater according to the effective data of the calorific value of the gas:

Among them, H _m,1 is the enthalpy value of gas at t _m1 temperature, unit is kJ/Nm ³ ; H _m,2 is the enthalpy value of gas at t _m2 temperature, unit is kJ/Nm ³ ; t _m1 is gas The inlet temperature of the gas side of the preheater, in °C; t _m2 is the outlet temperature of the gas side of the gas preheater, in °C;

Calculate the solution coefficients a and b according to the oxygen content of the flue gas:

为烟气含氧量，单位为％；in,

is the oxygen content of the flue gas, in %;

According to the enthalpy value of the flue gas, the enthalpy value of the gas and the solution coefficient, the low-level calorific value of the gas is calculated:

Among them, a and b are the solution coefficients; Q _net is the lower calorific value of gas, and the unit is kJ/Nm ³ .

Optionally, in an embodiment of the present invention, the manner of preprocessing the operating parameter data includes dead point processing and data smoothing processing.

The embodiment of the second aspect of the present invention provides a soft measurement device for the calorific value of blast furnace gas based on gas preheating, including:

The acquisition module is used to acquire real-time operating parameter data of the combustion and flue gas system; wherein, the operating parameter data includes: flue gas oxygen content, gas side inlet temperature of the gas preheater, gas side outlet temperature of the gas preheater, The inlet temperature of the flue gas side of the gas preheater and the outlet temperature of the flue gas side of the gas preheater;

A processing module, configured to preprocess the operating parameter data to obtain effective data for solving the calorific value of the gas;

The calculation module is used to calculate the flue gas enthalpy value of the flue gas at the inlet temperature of the flue gas side of the gas preheater and the outlet temperature of the flue gas side of the gas preheater according to the effective data of the calorific value of the gas:

Among them, H _y,1 is the enthalpy value of flue gas at θ ₁ temperature, unit is kJ/Nm ³ ; H _y,2 is the enthalpy value of flue gas at θ ₂ temperature, unit is kJ/Nm ³ ; θ ₁ is the inlet temperature of the flue gas side of the gas preheater, in °C; _θ2 is the outlet temperature of the flue gas side of the gas preheater, in °C;

Calculate the gas enthalpy value of the gas at the inlet temperature of the gas side of the gas preheater and the outlet temperature of the gas side of the gas preheater according to the effective data of the calorific value of the gas:

Among them, H _m,1 is the enthalpy value of gas at t _m1 temperature, unit is kJ/Nm ³ ; H _m,2 is the enthalpy value of gas at t _m2 temperature, unit is kJ/Nm ³ ; t _m1 is gas The inlet temperature of the gas side of the preheater, in °C; t _m2 is the outlet temperature of the gas side of the gas preheater, in °C;

Calculate the solution coefficients a and b according to the oxygen content of the flue gas:

为烟气含氧量，单位为％；Among them, a and b are the solution coefficients;

is the oxygen content of the flue gas, in %;

According to the enthalpy value of the flue gas, the enthalpy value of the gas and the solution coefficient, the low-level calorific value of the gas is calculated:

Among them, Q _net is the lower calorific value of gas, and the unit is kJ/Nm ³ .

Optionally, in an embodiment of the present invention, the manner of preprocessing the operating parameter data includes dead point processing and data smoothing processing.

The embodiment of the third aspect of the present invention provides an electronic device, including: a memory, a processor, and a computer program stored on the memory and operable on the processor, and the processor executes the program to perform The soft measurement method for the calorific value of blast furnace gas based on gas preheating as described in the above embodiments.

The embodiment of the fourth aspect of the present invention provides a computer-readable storage medium on which a computer program is stored, and the program is executed by a processor to perform the soft measurement of the calorific value of blast furnace gas based on gas preheating as described in the above embodiment method.

The blast furnace gas calorific value soft measurement method and device based on gas preheating proposed by the embodiment of the present invention have the following beneficial effects:

(1) Only the oxygen content of the flue gas, the inlet and outlet temperatures of the flue gas side and the gas side of the gas preheater are needed to obtain the low-level calorific value of the gas. Compared with the existing technology, the input data is greatly reduced, because the parameters themselves The result error caused by data error is also more controllable;

(2) The whole solution process is simple and convenient, which is greatly simplified compared with the tedious solution process in the prior art;

(3) The required input parameters are all monitoring parameters for normal operation of the equipment, without adding measuring points, it can be realized under the existing conditions, and has very strong operability.

Additional aspects and advantages of the invention 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.

Description of drawings

The above and/or additional aspects and advantages of the present invention will become apparent and easy to understand from the following description of the embodiments in conjunction with the accompanying drawings, wherein:

Fig. 1 is a flow chart of a soft measurement method for blast furnace gas calorific value based on gas preheating provided according to an embodiment of the present invention;

Fig. 2 is an example diagram of a blast furnace gas calorific value soft measurement device based on gas preheating according to an embodiment of the present invention;

Fig. 3 is a schematic structural diagram of an electronic device provided by an embodiment of the invention.

Detailed ways

Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

Fig. 1 is a flow chart of a method for soft measurement of calorific value of blast furnace gas based on gas preheating provided according to an embodiment of the present invention.

As shown in Figure 1, the soft measurement method for the calorific value of blast furnace gas based on gas preheating includes the following steps:

In step S101, the real-time operating parameter data of the combustion and flue gas system are acquired; wherein, the operating parameter data includes but not limited to: oxygen content of flue gas, inlet temperature of the gas side of the gas preheater, and outlet temperature of the gas side of the gas preheater , Gas preheater flue gas side inlet temperature, gas preheater flue gas side outlet temperature.

In step S102, the operating parameter data is preprocessed to obtain effective data for calculating the calorific value of the gas.

Optionally, in an embodiment of the present invention, the manner of preprocessing the operating parameter data includes but not limited to dead point processing and data smoothing processing.

In step S103, the flue gas enthalpy value of the flue gas at the inlet temperature of the flue gas side of the gas preheater and the outlet temperature of the flue gas side of the gas preheater is calculated according to the effective data of the calorific value of the gas:

Among them, H _y,1 is the enthalpy value of flue gas at θ ₁ temperature, unit is kJ/Nm ³ ; H _y,2 is the enthalpy value of flue gas at θ ₂ temperature, unit is kJ/Nm ³ ; θ ₁ is the inlet temperature of the flue gas side of the gas preheater, in °C; _θ2 is the outlet temperature of the flue gas side of the gas preheater, in °C;

Calculate the gas enthalpy value of the gas at the inlet temperature of the gas side of the gas preheater and the outlet temperature of the gas side of the gas preheater according to the effective data of the calorific value of the gas:

Among them, H _m,1 is the enthalpy value of gas at t _m1 temperature, unit is kJ/Nm ³ ; H _m,2 is the enthalpy value of gas at t _m2 temperature, unit is kJ/Nm ³ ; t _m1 is gas The inlet temperature of the gas side of the preheater, in °C; t _m2 is the outlet temperature of the gas side of the gas preheater, in °C;

Calculate the solution coefficients a and b according to the oxygen content of the flue gas:

为烟气含氧量，单位为％；Among them, a and b are the solution coefficients;

is the oxygen content of the flue gas, in %;

According to the flue gas enthalpy value, gas enthalpy value and solution coefficient to calculate the gas low heat value:

Among them, Q _net is the lower calorific value of gas, and the unit is kJ/Nm ³ .

In one embodiment of the present invention, the measuring point of the flue gas oxygen content is located in the flue near the inlet and outlet of the gas preheater.

According to the soft measurement method of blast furnace gas calorific value based on gas preheating proposed in the embodiment of the present invention, only the oxygen content of the flue gas, the inlet and outlet temperatures of the flue gas side and the gas side of the gas preheater can be used to obtain the low-level heat of the gas Compared with the existing technology, the input data is greatly reduced, and the result error caused by the data error of the parameter itself is also more controllable. Simplify the solution process, the required input parameters are the normal operation monitoring parameters of the equipment, no need to add measuring points, it can be realized under the existing conditions, and has very strong operability.

Next, with reference to the accompanying drawings, a soft measurement device for the calorific value of blast furnace gas based on gas preheating proposed according to an embodiment of the present invention will be described.

Fig. 2 is an example diagram of a blast furnace gas calorific value soft measurement device based on gas preheating according to an embodiment of the present invention.

As shown in FIG. 2 , the blast furnace gas calorific value soft measurement device 10 based on gas preheating includes: an acquisition module 100 , a processing module 200 and a calculation module 300 .

Wherein, the obtaining module 100 is used to obtain the real-time operation parameter data of the combustion and flue gas system; wherein, the operation parameter data includes: flue gas oxygen content, gas side inlet temperature of the gas preheater, gas side outlet temperature of the gas preheater , Gas preheater flue gas side inlet temperature, gas preheater flue gas side outlet temperature. The processing module 200 is used for preprocessing the operating parameter data to obtain effective data for calculating the calorific value of the gas. computing module 300, for

Calculate the flue gas enthalpy value of the flue gas at the inlet temperature of the flue gas side of the gas preheater and the outlet temperature of the flue gas side of the gas preheater according to the effective data of the calorific value of the gas:

Among them, H _y,1 is the enthalpy value of flue gas at θ ₁ temperature, unit is kJ/Nm ³ ; H _y,2 is the enthalpy value of flue gas at θ ₂ temperature, unit is kJ/Nm ³ ; θ ₁ is the inlet temperature of the flue gas side of the gas preheater, in °C; _θ2 is the outlet temperature of the flue gas side of the gas preheater, in °C;

Calculate the gas enthalpy value of the gas at the inlet temperature of the gas side of the gas preheater and the outlet temperature of the gas side of the gas preheater according to the effective data of the calorific value of the gas:

Among them, H _m,1 is the enthalpy value of gas at t _m1 temperature, unit is kJ/Nm ³ ; H _m,2 is the enthalpy value of gas at t _m2 temperature, unit is kJ/Nm ³ ; t _m1 is gas The inlet temperature of the gas side of the preheater, in °C; t _m2 is the outlet temperature of the gas side of the gas preheater, in °C;

Calculate the solution coefficients a and b according to the oxygen content of the flue gas:

为烟气含氧量，单位为％；Among them, a and b are the solution coefficients;

is the oxygen content of the flue gas, in %;

According to the flue gas enthalpy value, gas enthalpy value and solution coefficient to calculate the gas low heat value:

Among them, Q _net is the lower calorific value of gas, and the unit is kJ/Nm ³ .

It should be noted that the foregoing explanations on the embodiment of the blast furnace gas calorific value soft measurement method based on gas preheating are also applicable to the blast furnace gas calorific value soft measurement device based on gas preheating in this embodiment, and will not be repeated here.

According to the blast furnace gas calorific value soft measurement device based on gas preheating proposed in the embodiment of the present invention, only the oxygen content of the flue gas, the inlet and outlet temperatures of the flue gas side and the gas side of the gas preheater can be used to obtain the low-level heat of the gas. Compared with the existing technology, the input data is greatly reduced, and the result error caused by the data error of the parameter itself is also more controllable. Simplify the solution process, the required input parameters are the normal operation monitoring parameters of the equipment, no need to add measuring points, it can be realized under the existing conditions, and has very strong operability.

FIG. 3 is a schematic structural diagram of an electronic device provided by an embodiment of the present invention. This electronic equipment can include:

A memory 301 , a processor 302 , and a computer program stored in the memory 301 and executable on the processor 302 .

When the processor 302 executes the program, the soft measurement method for the calorific value of blast furnace gas based on gas preheating provided in the above-mentioned embodiments is realized.

Further, the electronic equipment also includes:

The communication interface 303 is used for communication between the memory 301 and the processor 302 .

The memory 301 is used to store computer programs that can run on the processor 302 .

The memory 301 may include a high-speed RAM memory, and may also include a non-volatile memory (non-volatile memory), such as at least one disk memory.

If the memory 301, the processor 302, and the communication interface 303 are implemented independently, the communication interface 303, the memory 301, and the processor 302 may be connected to each other through a bus to complete mutual communication. The bus may be an Industry Standard Architecture (Industry Standard Architecture, ISA for short) bus, a Peripheral Component Interconnect (PCI for short) bus, or an Extended Industry Standard Architecture (EISA for short) bus. The bus can be divided into address bus, data bus, control bus and so on. For ease of representation, only one thick line is used in FIG. 3 , but it does not mean that there is only one bus or one type of bus.

Optionally, in terms of specific implementation, if the memory 301, processor 302, and communication interface 303 are integrated on one chip, then the memory 301, processor 302, and communication interface 303 can communicate with each other through the internal interface.

The processor 302 may be a central processing unit (Central Processing Unit, referred to as CPU), or a specific integrated circuit (Application Specific Integrated Circuit, referred to as ASIC), or configured to implement one or more of the embodiments of the present invention integrated circuit.

This embodiment also provides a computer-readable storage medium, on which a computer program is stored, wherein when the program is executed by a processor, the above method for soft measurement of the calorific value of blast furnace gas based on gas preheating is realized.

In the description of this specification, descriptions referring to the terms "one embodiment", "some embodiments", "example", "specific examples", or "some examples" mean that specific features described in connection with the embodiment or example , structure, material or characteristic is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms are not necessarily directed to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or N embodiments or examples in an appropriate manner. In addition, those skilled in the art can combine and combine different embodiments or examples and features of different embodiments or examples described in this specification without conflicting with each other.

In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be interpreted as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include at least one of these features. In the description of the present invention, "N" means at least two, such as two, three, etc., unless otherwise specifically defined.

Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, segment or portion of code comprising one or N steps of executable instructions for implementing a custom logical function or process, Also, the scope of preferred embodiments of the present invention includes additional implementations in which functions may be performed out of the order shown or discussed, including substantially concurrently or in reverse order depending on the functions involved, which should be considered Embodiments of the present invention are understood by those skilled in the art.

It should be understood that various parts of the present invention can be realized by hardware, software, firmware or their combination. In the above embodiments, the N steps or methods may be implemented by software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware as in another embodiment, it can be implemented by any one or a combination of the following techniques known in the art: a discrete Logic circuits, ASICs with suitable combinational logic gates, Programmable Gate Arrays (PGA), Field Programmable Gate Arrays (FPGA), etc.

Those of ordinary skill in the art can understand that all or part of the steps carried by the methods of the above embodiments can be completed by instructing related hardware through a program, and the program can be stored in a computer-readable storage medium. During execution, one or a combination of the steps of the method embodiments is included.

Claims (6)

1. The blast furnace gas heat value soft measurement method based on gas preheating is characterized by comprising the following steps of:

acquiring real-time operation parameter data of a combustion and smoke system; wherein the operating parameter data comprises: the oxygen content of the flue gas, the gas side inlet temperature of the gas preheater, the gas side outlet temperature of the gas preheater, the gas side inlet temperature of the gas preheater and the gas side outlet temperature of the gas preheater;

preprocessing the operation parameter data to obtain effective data for solving the calorific value of the coal gas;

according to the effective data of the gas heat value, calculating the enthalpy value of the flue gas at the inlet temperature of the flue gas side of the gas preheater and the outlet temperature of the flue gas side of the gas preheater:

wherein H is _y,1 For flue gas at theta ₁ Enthalpy value at temperature in kJ/Nm ³ ；H _y,2 For flue gas at theta ₂ Enthalpy value at temperature in kJ/Nm ³ ；θ ₁ The unit is the temperature of the flue gas side inlet of the gas preheater; θ ₂ The unit is the temperature of the outlet of the flue gas side of the gas preheater;

calculating the gas enthalpy value of the gas at the gas side inlet temperature of the gas preheater and the gas side outlet temperature of the gas preheater according to the effective data of the gas heat value:

wherein H is _m,1 At t is gas _m1 Enthalpy value at temperature in kJ/Nm ³ ；H _m,2 At t is gas _m2 Enthalpy value at temperature in kJ/Nm ³ ；t _m1 The unit is the temperature of the inlet of the gas side of the gas preheater; t is t _m2 The unit is the outlet temperature of the gas side of the gas preheater;

calculating solving coefficients a and b according to the oxygen content of the flue gas:

wherein a and b are solving coefficients;

is fumeOxygen content in units of;

calculating the low-level heat value of the gas according to the flue gas enthalpy value, the gas enthalpy value and the solving coefficient:

wherein Q is _net Is the low-position heat value of coal gas, and the unit is kJ/Nm ³ 。

2. The method of claim 1, wherein the mode of preprocessing the operating parameter data includes dead-spot processing and data smoothing.

3. The utility model provides a blast furnace gas calorific value soft measurement device based on coal gas preheats which characterized in that includes:

the acquisition module is used for acquiring real-time operation parameter data of the combustion and smoke system; wherein the operating parameter data comprises: the oxygen content of the flue gas, the gas side inlet temperature of the gas preheater, the gas side outlet temperature of the gas preheater, the gas side inlet temperature of the gas preheater and the gas side outlet temperature of the gas preheater;

the processing module is used for preprocessing the operation parameter data to obtain effective data for solving the calorific value of the gas;

the calculation module is used for calculating the enthalpy value of the flue gas at the inlet temperature of the flue gas side of the gas preheater and the outlet temperature of the flue gas side of the gas preheater according to the effective data of the heat value of the gas:

wherein H is _y,1 For flue gas at theta ₁ Enthalpy value at temperature in kJ/Nm ³ ；H _y,2 For flue gas at theta ₂ Enthalpy value at temperature in kJ/Nm ³ ；θ ₁ The unit is the temperature of the flue gas side inlet of the gas preheater; θ ₂ The unit is the temperature of the outlet of the flue gas side of the gas preheater;

calculating the gas enthalpy value of the gas at the gas side inlet temperature of the gas preheater and the gas side outlet temperature of the gas preheater according to the effective data of the gas heat value:

wherein H is _m,1 At t is gas _m1 Enthalpy value at temperature in kJ/Nm ³ ；H _m,2 At t is gas _m2 Enthalpy value at temperature in kJ/Nm ³ ；t _m1 The unit is the temperature of the inlet of the gas side of the gas preheater; t is t _m2 The unit is the outlet temperature of the gas side of the gas preheater;

calculating solving coefficients a and b according to the oxygen content of the flue gas:

wherein a and b are solving coefficients;

the oxygen content of the flue gas is expressed as a unit;

calculating the low-level heat value of the gas according to the flue gas enthalpy value, the gas enthalpy value and the solving coefficient:

wherein Q is _net Is the low-position heat value of coal gas, and the unit is kJ/Nm ³ 。

4. A device according to claim 3, wherein the means for preprocessing the operation parameter data includes dead-spot processing and data smoothing processing.

5. An electronic device, comprising: a memory, a processor and a computer program stored on the memory and executable on the processor, the processor executing the program to implement the blast furnace gas heating value soft measurement method based on gas preheating of any one of claims 1-2.

6. A computer-readable storage medium, on which a computer program is stored, characterized in that the program is executed by a processor for implementing the soft measurement method of the calorific value of blast furnace gas based on gas preheating according to any one of claims 1-2.

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