A diagnostic method for a coke oven waste gas system

Abstract

The present invention relates to the field of coking. A method for diagnosing a waste gas system of a coke oven, the coke oven comprising a plurality of coke oven carbonization chambers, the number of waste gas shut-off valves being two more than the number of coke oven carbonization chambers, the waste gas shut-off valves being installed at the connection between the coke oven divided flue and each coke oven horizontal flue, each coke oven horizontal flue corresponding to one waste gas shut-off valve, each coke oven horizontal flue having two operating states and exchanging regularly, one operating state being to introduce gas and air, and the other operating state being to discharge waste gas. The coke oven horizontal flues are divided into the same number of odd-numbered and even-numbered ones in sequence. For each odd-numbered coke oven horizontal flue, its adjacent one is an even-numbered coke oven horizontal flue, and for each even-numbered coke oven horizontal flue, its adjacent one is an odd-numbered coke oven horizontal flue. The operating states of each odd-numbered coke oven horizontal flue are the same, the operating states of each even-numbered coke oven horizontal flue are the same, and the operating state of the odd-numbered coke oven horizontal flue is different from the operating state of the even-numbered coke oven horizontal flue.

Description

Technical Field

[0001] The present invention relates to the field of coking. Background Art

[0002] A coke oven is a furnace for producing coke and coke oven gas, which consists of multiple groups of carbonization chambers. Combustion chambers are arranged on both sides of each carbonization chamber. Combustion in the combustion chamber raises the temperature of the combustion chamber to about 1300 °C. Heat is transferred to the carbonization chamber through the wall of the combustion chamber. The coking coal in the carbonization chamber undergoes high-temperature carbonization for a certain period of time to form coke. The gas generated during the high-temperature carbonization process is discharged through channels and enters the recovery system for treatment. To ensure uniform ripening of coke in each carbonization chamber and energy conservation and high efficiency, the combustion chamber adopts a double-fire passage structure, and heating exchange is carried out every once in a while. The vertical fire passage that originally heated gas and air is changed to discharge combustion waste gas, and the vertical fire passage that originally discharged combustion waste gas is changed to the vertical fire passage for heating gas and air. This process is repeated to ensure the temperature balance of all the vertical fire passages in the combustion chamber, and the temperature of each combustion chamber should also be kept uniform and stable.

[0003] The exchange of the vertical fire passage state is realized by the coke oven reversing machine and the exchange drive mechanism. The reversing machine performs the exchange every certain period of time, and the exchange drive mechanism drives the gas exchange cock to complete the exchange. The operation of the reversing machine is the core of the coke oven heating system. Coking plants usually allocate special posts for the inspection and maintenance of equipment operation. The number of equipment in the exchange system is large, and operation failures or insufficient accuracy often lead to poor uniformity of the combustion chamber temperature. In severe cases, it will result in output loss and production accidents, which has always been the key control content in the production process of coking plants.

[0004] The technical problem to be solved by the present invention is: how to diagnose the problems of the coke oven waste gas system by analyzing the pressure and temperature parameters of the coke oven waste gas system. Summary of the Invention

[0005] The technical solution adopted by the present invention is as follows: A method for diagnosing a coke oven waste gas system. The coke oven includes a plurality of coke oven carbonization chambers. The number of waste gas shut-off valves is two more than the number of coke oven carbonization chambers. The waste gas shut-off valves are installed at the connection between the coke oven main flue and each coke oven horizontal flue. Each coke oven horizontal flue corresponds to one waste gas shut-off valve. Each coke oven horizontal flue has two operating states and exchanges regularly. One operating state is to introduce gas and air, and the other operating state is to discharge waste gas. The coke oven horizontal flues are divided into the same number of odd-numbered and even-numbered ones in sequence. For each odd-numbered coke oven horizontal flue, its adjacent one is an even-numbered coke oven horizontal flue. For each even-numbered coke oven horizontal flue, its adjacent one is an odd-numbered coke oven horizontal flue. Each odd-numbered coke oven horizontal flue has the same operating state, and each even-numbered coke oven horizontal flue has the same operating state. The operating state of the odd-numbered coke oven horizontal flues is different from that of the even-numbered coke oven horizontal flues. When the operating state of the coke oven horizontal flue corresponding to the waste gas shut-off valve is to introduce gas and air, it is recorded as the red direction. When the operating state of the coke oven horizontal flue corresponding to the waste gas shut-off valve is to discharge waste gas, it is recorded as the green direction. The temperature control of each waste gas shut-off valve includes a low-value PL control and a high-value PH control. The lower limit value of the low-value PL control is PLl and the upper limit value is PLh. The lower limit value of the high-value PH control is PHl and the upper limit value is PHh. When the low-value PL control is in effect, the temperature change Tp is a positive value. The lower limit value of the temperature change Tp is Tpl and the upper limit value is Tph. When the high-value PH control is in effect, the temperature change Tn is a negative value. The lower limit of the temperature change Tn is Tnl and the upper limit is Tnh; for any waste gas shut-off valve N, its red-direction pressure is recorded as NP R , and its red-direction temperature is recorded as NT R , its green-direction pressure is recorded as NP G , and its green-direction temperature is recorded as NT G ; when the waste gas shut-off valve N corresponds to an odd-numbered coke oven horizontal flue, N is an odd number. When the waste gas shut-off valve N corresponds to an even-numbered coke oven horizontal flue, N is an even number; when N is an odd number and in the red direction, it satisfies NP R = PL, NT R = Tp. When in the green direction, it satisfies NP G = PH, NT G = Tn. The parameters of the waste gas shut-off valve N are within the normal operating condition range, and others belong to abnormal operating conditions; when N is an even number and in the red direction, it satisfies NP R = PH, NT R = Tn; when in the green direction, it satisfies NP G = PL, NT G = Tp. The parameters of the waste gas shut-off valve N are within the normal operating condition range, and others belong to abnormal operating conditions.

[0006] The abnormal operating condition diagnosis when N is an odd number and in the red direction is that if NP R > PHh, it indicates that the waste gas weight has fallen. If PHl > NPR >PLh, and NT R =Tp means the horizontal flap is loose, if PHl>NP R >PLh, and NT R <Tpl则说明进风口支起或交换旋塞长开,如果NP R <PLl,则说明水平翻板松动,其它异常工况则说明参数匹配异常。

[0007] When N is an even number and in the red direction, the abnormal condition diagnosis is: if NPR <PHl,且NTR<Tnl则说明废气砣支起,如果NP R <PHl,且NT R =Tn means the exchange cock is blocked and the opening is insufficient. R >PHh and NT R =Tn means that the exhaust gas valve corresponding to the adjacent exhaust gas switch is abnormal, and other abnormal operating conditions indicate that the parameter matching is abnormal.

[0008] When N is an even number and is green, the abnormal condition diagnosis is: if NP G >PHh, it means the exhaust gas has fallen. If PHl>NP G >PLh, and NT G =Tn, it means the horizontal flap is loose. If PHl>NP G >PLh, and NT G <Tpl,则说明水平翻板松动,如果NP G <PLl,则说明水平翻板松动,其它非正常情况则说明参数匹配异常。

[0009] When N is odd and green, the abnormal condition diagnosis is: if NP G <PHl,且NT G <Tnl时则说明废气砣支起,如果NP G <PHl,且NT G =Tn means the exchange cock is blocked and the opening is insufficient. G > PHh, and NT G =Tn means that the exhaust gas valve corresponding to the adjacent exhaust gas switch is abnormal, and other abnormal situations indicate that the parameter matching is abnormal.

[0010] The beneficial effects of the present invention are as follows: the present invention is based on the application technology of the coke oven exhaust system data, through continuous online measurement of the pressure and temperature data of each exhaust gas switch, and then screening and classifying the pressure and temperature data of the exhaust gas switch, to judge the coke oven heating system fault. DETAILED DESCRIPTION

[0011] The coke oven has several waste gas regulators, usually the number of carbonization chambers in the coke oven + 2. Taking the 7.63m coke oven as an example, it is configured with 70 carbonization chambers and 72 waste gas regulators. This equipment is installed at the connection between the horizontal flue of the coke oven and the sub-flue of the coke oven. Taking the 7.63m coke oven as an example, 72 waste gas regulators are installed on one sub-flue and then connected to 72 horizontal flues respectively. Its main functions are to distribute gas into the horizontal flue, introduce air into the horizontal flue, and introduce the waste gas in the horizontal flue into the sub-flue.

[0012] The main equipment configuration of the present invention requires a PLC main cabinet, an industrial control computer, a thermocouple, a differential pressure transmitter, a gas and flue gas composition analyzer, etc. Among them, the thermocouple and the differential pressure transmitter are installed on the waste gas regulator.

[0013] Taking the 7.63m coke oven as an example, the 72 horizontal flues are divided into odd and even numbers. The operating states of all odd-numbered and all even-numbered equipment are opposite, that is, when the odd-numbered ones introduce gas and air, the even-numbered ones discharge waste gas; when the even-numbered ones introduce gas and air, the odd-numbered ones discharge waste gas. These two states are called two phases, which are uniformly represented by red phase and green phase. The two phases need to be exchanged regularly, and the purpose is to ensure the uniformity of the coke oven temperature.

[0014] During each exchange process, the pressure and temperature on the waste gas regulator can reflect the operating state of the heating system. By analyzing the data of these pressures and temperatures, it can be determined in a timely manner whether the system is in a normal or abnormal state, and it can also guide the optimization of the adjustment of the parameters of each waste gas regulator. These parameters include the opening degree of the horizontal flap on the waste gas regulator, the opening degree of the air inlet, and the size of the flow regulating orifice plate on the gas branch pipe connected to it.

[0015] The coke oven waste gas system is composed of waste gas regulators and their auxiliary equipment. Its main function is to be responsible for distributing gas for the coke oven heating system, introducing air, and discharging the waste gas of the coke oven heating. It is a subsystem of the coke oven heating system.

[0016] According to the exchange characteristics of the coke oven heating system, the pressure and temperature parameters of each waste gas regulator are defined as the control parameters of the system model. The two states of the heating system exchange are respectively defined as red phase and green phase, and the corresponding pressure and temperature parameters are represented by P R 、P G 、T R 、T G indicates.

[0017] Two control levels, namely low-value PL control and high-value PH control, are respectively defined for the pressure and temperature parameters of each monitoring point.

[0018] Table 1: Standard values of two control levels of pressure and temperature

[0019]

[0020] Define two attribute tags for each exhaust gas switch

[0021] Table 2: Attribute tags of exhaust gas switch

[0022]

[0023] Set the pressure and temperature parameter ranges of the exhaust gas switch under normal conditions

[0024] Table 3: Normal condition ranges of exhaust gas switch parameters, where N is any exhaust gas switch number

[0025]

[0026] Set the abnormal types of exhaust gas switch pressure and temperature parameters

[0027] Table 4: Abnormal types of exhaust gas switch parameters

[0028]

[0029] Main monitoring design

[0030] For the P1, P2, and T parameters of each exhaust gas switch within the same switching phase, when the parameters meet the range in Table 3, display the current value and the background color is the same as the switching phase, which is red or green. When the parameters are abnormal, display the current value and the background color is yellow, and for the abnormal type, according to the corresponding conditions in Table 4, perform the corresponding alarm pop-up window.

[0031] 1. Real-time monitor the pressure and temperature parameters of the exhaust gas switch to achieve the function of replacing manual inspection of the switching system equipment.

[0032] 2. Analyze and diagnose the pressure and temperature parameters of the exhaust gas switch to judge the abnormal type and locate the furnace number with problems, so as to achieve the goal of quickly troubleshooting.

[0033] 3. Online monitor the real-time parameters of each exhaust gas switch, which can synchronously guide the debugging work of the coke oven furnace temperature, achieve the consistency of the whole furnace parameters, and achieve the purpose of uniform and stable furnace temperature.

Claims

1. A method for diagnosing a coke oven waste gas system. The coke oven includes multiple coke oven carbonization chambers. The number of waste gas regulators is two more than the number of coke oven carbonization chambers. The waste gas regulators are installed at the connection between the coke oven divided flue and each coke oven horizontal flue. Each coke oven horizontal flue corresponds to one waste gas regulator. Each coke oven horizontal flue has two operating states and exchanges regularly. One operating state is to introduce gas and air, and the other operating state is to discharge waste gas. The coke oven horizontal flues are sequentially divided into the same number of odd-numbered and even-numbered flues. The adjacent flue of each odd-numbered coke oven horizontal flue is an even-numbered coke oven horizontal flue, and the adjacent flue of each even-numbered coke oven horizontal flue is an odd-numbered coke oven horizontal flue. The operating states of each odd-numbered coke oven horizontal flue are the same, and the operating states of each even-numbered coke oven horizontal flue are the same. The operating state of the odd-numbered coke oven horizontal flue is different from the operating state of the even-numbered coke oven horizontal flue. When the operating state of the coke oven horizontal flue corresponding to the waste gas regulator is to introduce gas and air, it is recorded as the red direction, and when the operating state of the coke oven horizontal flue corresponding to the waste gas regulator is to discharge waste gas, it is recorded as the green direction. The method is characterized in that: The temperature control of each exhaust gas shutter includes low-value PL control and high-value PH control. The lower limit of the low-value PL control is PLl, and the upper limit is PLh. The lower limit of the high-value PH control is PHl, and the upper limit is PHh. When the low-value PL control is in effect, the temperature change Tp is positive. The lower limit of the temperature change Tp is Tpl, and the upper limit is Tph. When the high-value PH control is in effect, the temperature change Tn is negative. The lower limit of the temperature change Tn is Tnl, and the upper limit is Tnh. For any exhaust gas shutter N, its red-direction pressure is denoted as NP R , and its red-direction temperature is denoted as NT R , and its green-direction pressure is denoted as NP G , and its green-direction temperature is denoted as NT G ; when the exhaust gas shutter N corresponds to the horizontal flue of the odd-numbered coke oven, N is odd. When the exhaust gas shutter N corresponds to the horizontal flue of the even-numbered coke oven, N is even. When N is odd and in the red direction, NP R = PL, NT R = Tp. When in the green direction, NP G = PH, NT G = Tn. The parameters of the exhaust gas shutter N are within the normal operating range, and the others are in the abnormal operating range. When N is even and in the red direction, NP R = PH, NT R = Tn; when in the green direction, NP G = PL, NT G = Tp. The parameters of the exhaust gas shutter N are within the normal operating range, and the others are in the abnormal operating range. When N is odd and in the red direction, the abnormal operating condition diagnosis is that if NP R > PHh, it indicates that the exhaust gas weight has fallen. If PHl > NP R > PLh, and NT R = Tp, it indicates that the horizontal flap is loose. If PHl > NP R > PLh, and NT R < Tpl, it indicates that the air inlet is propped up or the exchange cock is always open. If NP R < PLl, it indicates that the horizontal flap is loose. Other abnormal operating conditions indicate parameter matching abnormalities. When N is even and in the red direction, the abnormal operating condition diagnosis is that if NPR < PHl and NTR < Tnl, it indicates that the exhaust gas weight is propped up. If NP R < PHl, and NT R = Tn, it indicates that the exchange cock is jammed and the opening is insufficient. If NP R > PHh and NT R = Tn, it indicates that the exhaust gas weight corresponding to the adjacent exhaust gas shutter is abnormal. Other abnormal operating conditions indicate parameter matching abnormalities. When N is even and in the green direction, the abnormal operating condition diagnosis is that if NP G > PHh, it indicates that the exhaust gas weight has fallen. If PHl > NP G >PLh, and NT G = Tn, it indicates that the horizontal flap is loose. If PHl > NP G >PLh, and NT G <Tpl, it indicates that the horizontal flap is loose. If NP G <PLl, it indicates that the horizontal flap is loose. Other abnormal conditions indicate abnormal parameter matching; When N is odd and in the green direction, the abnormal working condition diagnosis is that if NP G <PHl, and NT G <Tnl, it indicates that the waste gas weight is lifted. If NP G <PHl, and NT G = Tn, it indicates that the switching plug is jammed and the opening is insufficient. If NP G >PHh, and NT G = Tn, it indicates that the waste gas weights corresponding to adjacent waste gas opening and closing devices are abnormal. Other abnormal conditions indicate abnormal parameter matching.

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