CN103468860B - Device and method for metering calorific value of converter gas - Google Patents

Abstract

The invention discloses a device and a method for metering the calorific value of converter gas. The device comprises a converter gas holder, a converter gas CO analysis meter, a first converter gas flowmeter and a second converter gas flowmeter, wherein the converter gas CO analysis meter and the first converter gas flowmeter are sequentially arranged on a gas inlet pipeline of the converter gas holder, the second converter gas flowmeter is arranged on a gas outlet pipeline of the converter gas holder, and the converter gas CO analysis meter, the first converter gas flowmeter and the second converter gas flowmeter are respectively connected with a PLC (Programmable Logic Controller) system. The metering method adopts the metering device and a special formula to calculate the calorific value. The metering device and the metering method can effectively and fast meter the calorific value of converter gas, avoid the pure lag problem of calorific value analysis of an online calorific value analyzer, do not need an extra pure lag estimate compensation device, and provide guidance for regulation and management of gas.

Description

A kind of coal gas of converter caloricity gaging device and metering method

Technical field

The present invention relates to gas measurement thermal value control system, particularly, the present invention relates to a kind of coal gas of converter caloricity gaging device and metering method.

Background technology

Calorific value of gas is as one of main quality index of coal gas, its measurement result for reasonable production, regulate gas supply and generating and effectively utilize gas energy important in inhibiting, guarantee process equipment is run well, improve burning efficiency and improves and make steel quality and play a part very important.

The way of recycling of coal gas of converter is that batch (-type) reclaims, in process, the calorific value of each stove and pressure all constantly change, and there is comparatively large time delay in the measured value of the online caloric value instrument of coal gas of converter, make system cloud gray model unstable, sometimes be even difficult to put into operation, therefore, pure-hysteresis prediction compensation system separately established by general needs, make system comparatively complicated, be unfavorable for controlling.

Summary of the invention

The object of the invention is to, a kind of coal gas of converter caloricity gaging device and metering method are provided, this device and the calorific value of coal gas of converter can be measured based on the metering method of this device effectively, efficiently, avoid the purely retarded problem of online calorimetry instrument calorimetry, and do not need separately to establish pure-hysteresis prediction compensation system, for the adjustment management of coal gas provides guidance.

For achieving the above object, the technical solution used in the present invention is:

A kind of coal gas of converter caloricity gaging device, described device comprises converter gas cabinet 1, described device also comprises coal gas of converter CO analyser 2, the first coal gas of converter flowmeter 3 on the admission line being successively set on converter gas cabinet 1, and the second coal gas of converter flowmeter 4 be arranged on converter gas cabinet 1 outlet pipe, described coal gas of converter CO analyser 2, first coal gas of converter flowmeter 3, second coal gas of converter flowmeter 4 is connected with PLC system respectively;

Described PLC system for receive coal gas of converter CO analyser (2), the first coal gas of converter flowmeter (3), the second coal gas of converter flowmeter (4) measurement data and according to program computation calorific value of gas.

Based on a caloricity gaging method for above-mentioned coal gas of converter caloricity gaging device, said method comprising the steps of:

1) CO content Q in coal gas of converter CO analyser 2 online real time collecting converter gas ₁, adopt formula K ₁=CJ*Q ₁calculate coal gas of converter gas holder entrance calorific value of gas K ₁, wherein, CJ is mark condition CO gas heating value;

2) the first coal gas of converter flowmeter 3 and the second coal gas of converter flowmeter 4 online measure converter gas cabinet in real time respectively enter cabinet flow F ₁with the flow F that offers for sale ₂;

3) gross heat of combustion amount before and after cabinet is entered according to coal gas constant, and according to the K that step 1) obtains ₁value calculates converter gas holder export coal gas calorific value K ₂;

4) K is obtained according to calibrating gas state equation and step 3) again ₂value calculates pressurizing point outlet calorific value of gas K ₃.

K in described step 3) ₂adopt following formulae discovery:

$K_2=\frac{\mathrm{KT}*H_1*S+K_1*F_1}{H_2*S+F_2},$

Wherein, KT had gas heating value in gas holder before 1 recovery sampling period;

F ₁be that in 1 recovery sampling period, coal gas enters cabinet flow;

F ₂be 1 to reclaim coal gas in the sampling period and to offer for sale flow;

H ₁be 1 and reclaim sampling period secondary piston position;

H ₂be 1 and reclaim sampling period back piston position;

S is piston bottom area;

1 sampling period is 1 second.

K in described step 4) ₃adopt following formulae discovery:

$K_3=K_2*\frac{(P_0+P_1)}{(P_0+P_2)},$

Wherein, P ₀it is 1 standard atmospheric pressure;

P ₁for gas pressure before pressuring machine;

P ₂for gas pressure after pressuring machine.

The present invention sets PLC system, can calculate the data measured according to above-mentioned formula and export result of calculation.

The present invention by the CO content collected, cabinet gas flow Signal transmissions of coming in and going out in PLC system, draw converter gas holder export coal gas calorific value according to above-mentioned formulae discovery, and by data acquisition network, calorific value data reached data server.

The present invention adopts CO content in online real time collecting converter gas, and in conjunction with flow measurement, obtained turn calorific value of gas by calculating, its result has real-time, there is not lag issues, does not need to install compensation system.

Accompanying drawing explanation

Fig. 1 is the operating structure schematic diagram of measuring apparatus of the present invention;

Fig. 2 is converter gas cabinet working state schematic representation of the present invention;

Fig. 3 is 9 hours duration target datas of the embodiment of the present invention 1 and calculates Data Comparison result;

Fig. 4 is 2 days duration target datas of the embodiment of the present invention 2 and calculates Data Comparison result;

Reference numeral: 1, converter gas cabinet; 2, coal gas of converter CO analyser; 3, the first coal gas of converter flowmeter; 4, the second coal gas of converter flowmeter.

Embodiment

With the drawings and specific embodiments, the present invention is further detailed explanation below.

Embodiment 1

As shown in Figure 1, a kind of coal gas of converter caloricity gaging device, described device comprises converter gas cabinet 1, described device also comprises coal gas of converter CO analyser 2, the first coal gas of converter flowmeter 3 on the admission line being successively set on converter gas cabinet 1, and the second coal gas of converter flowmeter 4 be arranged on converter gas cabinet 1 outlet pipe, described coal gas of converter CO analyser 2, first coal gas of converter flowmeter 3, second coal gas of converter flowmeter 4 is connected with PLC system respectively.

The step of the present invention in concrete production run is: according to RECOVERY OF CONVERTER GAS technique, by installing metering outfit before and after converter gas cabinet, the CO content collected, flow signal are transferred in PLC system, calculate coal gas of converter to offer for sale the calorific value at place, and by data acquisition network, calorific value data are reached data server.

As shown in Figure 2, operationally, the calorific value of gas account form in exit is as follows for converter gas cabinet of the present invention:

Enter gross heat of combustion amount before and after cabinet according to coal gas constant, draw following formula:

$K_2*H_2*S+{\∫}_0^T{K}_2{F}_2\mathrm{dt}=\mathrm{KT}*H_1*S+{\∫}_0^T{K}_1{F}_1\mathrm{dt}---\left(1\right)$

Wherein:

K ₁: converter gas holder entrance calorific value of gas (KJ/Nm ³)

K ₂: converter gas holder export coal gas calorific value (KJ/Nm ³)

Existing gas heating value (KJ/Nm in gas holder before KT:1 recovery sampling period ³)

T: reclaim the sampling period (s)

F ₁: 1 is reclaimed coal gas in the sampling period and enters cabinet flow (Nm ³/ s)

F ₂: 1 is reclaimed coal gas in the sampling period and to offer for sale flow (Nm ³/ s)

H ₁: reclaimed sampling secondary piston position (m) before 1 recovery sampling period

H ₂: 1 is reclaimed sampling period back piston position (m)

S: piston bottom area (m ²)

KT, H ₁, H ₂carry surveying instrument by converter gas holder inside to measure in real time.

Setting the program samples cycle between payback period is 1 second, then draw according to above-mentioned formula:

$K_2=\frac{\mathrm{KT}*H_1*S+K_1*F_1}{H_2*S+F_2},(\mathrm{KJ}/N{m}^3)---\left(2\right)$

Wherein gas holder entrance calorific value of gas is as follows:

K ₁＝CJ*Q ₁（KJ/Nm ³） （3）

Q ₁: gas holder inlet flue gas CO content (%)

CJ: mark condition CO gas heating value (1.2623*10 ⁷kJ/Nm ³)

Following calorific value calculation formula is drawn again according to calibrating gas state equation:

$K_3=K_2*\frac{(P_0+P_1)}{(P_0+P_2)},(\mathrm{KJ}/N{m}^3)---\left(4\right)$

K ₃: pressurizing point outlet calorific value of gas (KJ/Nm ³)

P ₀: 1 standard atmospheric pressure (101.325Kpa)

P ₁: gas pressure (Kpa) before pressuring machine

P ₂: gas pressure (Kpa) after pressuring machine

P1 and P2 all has the device for pressure measurement in pressuring machine to measure in real time.

Embodiment 2

For certain steel mill 120 tons of converter gas recovery systems, this recovery system is provided with the online calorimetry instrument of coal gas of converter, and pure-hysteresis prediction compensation system is housed for revised data, defining these data is target data, and the data that metering method of the present invention obtains are defined as calculating data.

According to formula (2), (3) and (4) calculating K ₁, K ₂, K ₃value, the wherein KT=7582.406kJ/Nm of starting point in 9 hours periods ³, H ₁=10.652m, S=2640.07m ², P ₁=2.70kPa, the H of 9 hours terminals ₂=17.581m, P ₂=9.68kPa, contrast 9 hours duration data result history curves as shown in Figure 3, data results is as shown in table 1.

Table 19 hours duration target datas and calculating Data Comparison result

According to data relative error result, computing heating value K3 is comparatively close with the actual measurement calorific value of employing pure-hysteresis prediction compensation system, illustrates and adopts device of the present invention and metering method to there is not hysteresis quality, can substitute traditional caloricity gaging system completely.

Embodiment 3:

For certain steel mill 120 tons of converter gas recovery systems, this recovery system is provided with the online calorimetry instrument of coal gas of converter, and pure-hysteresis prediction compensation system is housed for revised data, defining these data is target data, and the data that metering method of the present invention obtains are defined as calculating data.

According to formula (2), (3) and (4) calculating K ₁, K ₂, K ₃value, the wherein KT=7574.25kJ/Nm of starting point in 2 day cycle ³, H ₁=22.510m, S=2640.07m ², P ₁=2.97kPa, the H of terminal ₂=12.653mP ₂=9.09kPa, contrast 2 days duration data result history curves as shown in Figure 4, data results is as shown in table 2.

Table 22 days duration target datas and calculating Data Comparison result

According to data relative error result, computing heating value K ₃the actual measurement calorific value of pure-hysteresis prediction compensation system is comparatively close with adopting, and illustrates and adopts device of the present invention and metering method to there is not hysteresis quality, can substitute traditional caloricity gaging system completely.

Claims (2)

1. a coal gas of converter caloricity gaging device, described device comprises converter gas cabinet (1), it is characterized in that, described device also comprises coal gas of converter CO analyser (2), the first coal gas of converter flowmeter (3) on the admission line being successively set on converter gas cabinet (1), and the second coal gas of converter flowmeter (4) be arranged on converter gas cabinet (1) outlet pipe, described coal gas of converter CO analyser (2), the first coal gas of converter flowmeter (3), the second coal gas of converter flowmeter (4) are connected with PLC system respectively;

Described PLC system for receive coal gas of converter CO analyser (2), the first coal gas of converter flowmeter (3), the second coal gas of converter flowmeter (4) measurement data and according to program computation calorific value of gas.

2., based on a caloricity gaging method for coal gas of converter caloricity gaging device described in claim 1, said method comprising the steps of:

1) CO content Q in coal gas of converter CO analyser (2) online real time collecting converter gas ₁, calculate converter gas cabinet entrance calorific value of gas K ₁;

2) the first coal gas of converter flowmeter (3) and the second coal gas of converter flowmeter (4) online measure converter gas cabinet in real time respectively enter cabinet flow F ₁with the flow F that offers for sale ₂;

3) gross heat of combustion amount before and after cabinet is entered according to coal gas constant, and according to step 1) K that obtains ₁value calculates converter gas cabinet outlet calorific value of gas K ₂;

4) again according to calibrating gas state equation and step 3) obtain K ₂value calculates pressurizing point outlet calorific value of gas K ₃;

Described step 1) middle K ₁adopt following formulae discovery:

K ₁＝CJ*Q ₁，

Wherein CJ is mark condition CO gas heating value;

Described step 3) middle K ₂adopt following formulae discovery:

$K_2=\frac{\mathrm{KT}*H_1*S+K_1*F_1}{H_2*S+F_2},$

Wherein, KT is for reclaiming existing gas heating value in front gas holder;

F ₁be that in 1 recovery sampling period, coal gas enters cabinet flow;

F ₂be 1 to reclaim coal gas in the sampling period and to offer for sale flow;

H ₁be 1 and reclaim sampling period secondary piston position;

H ₂be 1 and reclaim sampling period back piston position;

S is piston bottom area;

1 sampling period is 1 second;

Described step 4) middle K ₃adopt following formulae discovery:

$K_3=K_2*\frac{(P_0+P_1)}{(P_0+P_2)},$

Wherein, P ₀it is 1 standard atmospheric pressure;

P ₁for gas pressure before pressuring machine;

P ₂for gas pressure after pressuring machine.