Mixed gas heating single-hole combustion chamber temperature adjusting system

Abstract

The utility model relates to the technical field of coke oven heating, in particular to a mixed gas heating single-hole combustion chamber temperature adjusting system which comprises adjusting units, one end of each adjusting unit is connected with a mixed heating gas main pipe, and the other end of each adjusting unit is connected with a corresponding waste gas shutter. And the mixed coal gas sequentially passes through the mixed heating coal gas main pipe, the corresponding adjusting unit, the corresponding waste gas opening and closing device and the corresponding heat storage chamber to enter the corresponding combustion chamber. The utility model has the advantages that: the original gas heating pipeline is improved, and the regulating valve is connected with the gas heating pipeline in parallel on the basis of not changing equipment (the equipment comprises the regulating cock, the pore plate box and the exchange cock) on the gas heating pipeline, so that the independence of manual regulation is ensured, and the gas heating pipeline is convenient to use. The furnace temperature adjusting effect of each combustion chamber during mixed gas heating is improved; and various pore plates with different diameters are arranged in the pore plate box, so that the requirement of manual adjustment can be met.

Description

TECHNICAL FIELD

[0001] The utility model relates to a coke oven heating technical field especially relates to a mixed coal gas heating single hole combustion chamber temperature regulating system. BACKGROUND

[0002] Coke oven combustion chamber temperature control usually adopts the coal gas flow or pressure regulation on the coal gas main pipe to control the whole oven temperature, or the staff controls the coke oven heating coal gas flow by changing the orifice plate size in the orifice plate box, due to the limited orifice plate size, the adjustment precision is poor, and the coke oven combustion chamber quantity is much, needs the experienced operator to operate frequently, and the coke oven basement belongs to the dangerous area, and the manual operation has the security risk.

[0003] In the prior art, the patent name is "a coke oven single hole combustion chamber temperature regulating device", including the coal gas horizontal pipe, the exchange plug, the branch pipe plus minus plug, the orifice plate box and the coke oven gas main pipe, the coal gas horizontal pipe is connected exchange plug through the pipeline in the vertical direction, exchange plug is connected branch pipe plus minus plug through the pipeline, and orifice plate box is arranged on the pipeline between exchange plug and branch pipe plus minus plug, branch pipe plus minus plug is connected coke oven gas main pipe through the pipeline, and its characterized in that, still include regulating valve, hand valve, regulating valve cylinder, regulating controller, gas source pipe, signal cable and cable bridge, regulating valve is arranged on the pipeline between exchange plug and orifice plate box, regulating valve inlet end connects hand valve, and hand valve's inlet end connects regulating valve cylinder, and the air inlet end of regulating valve cylinder is connected gas source main pipe through gas source pipe, and the electric signal line of regulating valve cylinder connects regulating controller IO port, and the signal cable of regulating controller is connected to control system through cable bridge;Defects are as follows:

[0004] 1, place regulating valve and orifice plate box in series on heating coal gas branch pipe, and the size of regulating valve is large, and the installation space is small, is not favorable to maintenance, and investment is high,

[0005] 2, gas source consumption is large, and only rough adjustment can be realized, and the combustion chamber temperature regulating effect is poor. SUMMARY

[0006] The utility model discloses a kind of mixed coal gas heating single hole combustion chamber temperature regulating system, increase regulating unit between waste gas on-off device and mixed coal gas main pipe, improve each combustion chamber temperature regulating effect when mixed coal gas heating.

[0007] To achieve the above object, the utility model discloses the following technical scheme:

[0008] The system comprises regulating units, one end of each of the regulating units is connected with a mixed heating gas main pipe respectively, and the other end of each of the regulating units is connected with a corresponding waste gas on-off device, so that the mixed gas sequentially passes through the mixed heating gas main pipe, the corresponding regulating unit, the corresponding waste gas on-off device, the corresponding heat storage chamber and enters the corresponding combustion chamber.

[0009] The coke oven with unilateral heating is provided with N+1 regulating units, and the coke oven with bilateral heating is provided with 2N+2 regulating units, N being the number of combustion chambers.

[0010] The regulating unit comprises a heating gas pipe and a gas regulating branch pipe, the heating gas pipe is connected with the gas regulating branch pipe in parallel, the heating gas pipe is sequentially provided with a regulating cock, an orifice box and an exchange cock, and the gas regulating branch pipe is provided with a regulating valve.

[0011] One end of the regulating valve is connected with the input end of the regulating cock, and the pipeline connection of the exchange cock and the orifice box is connected with the other end of the regulating valve.

[0012] The output end of the exchange cock is provided with a pressure transmitter; the orifice box is provided with a plurality of orifices with different sizes, the number of the orifice types is greater than or equal to 7, the number of orifices used for the side oven and the edge oven of the unilateral heating coke oven is greater than 2, and the number of orifices used for the side oven and the edge oven of the bilateral heating coke oven is greater than or equal to 4.

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] 1. The original heating gas pipe is improved, the regulating valve is connected with the heating gas pipe in parallel on the basis of not changing the equipment on the heating gas pipe (the equipment comprises a regulating cock, an orifice box and an exchange cock), the independence of manual regulation is ensured, and the regulating effect of the oven temperature of each combustion chamber during the heating of the mixed gas is improved.

[0015] 2. The orifice box is provided with a plurality of orifices with different diameters, and the needs of manual regulation can be met.

[0016] 3. The amount of manual work in the dangerous area of the coke oven basement is greatly reduced, the labor cost is reduced, and the health and safety of the maintenance personnel are improved. DRAWINGS

[0017] Figure 1 is a schematic view of a regulating unit of a mixed gas single-hole combustion chamber.

[0018] Figure 2 is a current exchange period combustion chamber temperature-pressure cascade control flow chart.

[0019] Figure 3is the next exchange cycle combustion chamber temperature-pressure cascade control flow chart.

[0020] Figure 4 is the configuration one scheme pressure measuring point layout.

[0021] Figure 5 is the configuration two scheme pressure measuring point layout.

[0022] In the figure: 1 - mixed heating gas main pipe 2 - regulating cock 3 - orifice plate box 4 - exchange cock 5 - coal gas regulating branch pipe 6 - stop valve A 7 - stop valve B 8 - regulating valve 9 - stop valve C 10 - pressure transmitter. DETAILED DESCRIPTION

[0023] The utility model will be described in detail below in combination with the drawings of the specification, but it should be pointed out that the implementation of the utility model is not limited to the following embodiments.

[0024] The following examples are implemented under the premise of the technical scheme of the utility model, and detailed implementation modes and specific operation processes are given, but the protection scope of the utility model is not limited to the following examples. The methods used in the following examples are all conventional methods unless otherwise specified.

[0025] Example 1

[0026] A coking plant adopts 60-hole carbonization chamber regenerative single-side heating coke oven, and there are 61 combustion chambers, and the combustion chamber numbers are 1~61# in turn; the whole heating gas regulating system needs to be configured with 62 groups of single-hole combustion chamber regulating units, and the regulating unit numbers are 1#~62# in turn; one end of each regulating unit is connected with the mixed heating gas main pipe respectively, and the other end of each regulating unit is connected with the gas inlet of the corresponding waste gas on-off device, so that the mixed gas passes through the mixed heating gas main pipe, the corresponding regulating unit, the corresponding waste gas on-off device and the corresponding regenerative chamber in turn and enters the corresponding combustion chamber.

[0027] Single-hole combustion chamber regulating unit, see Figure 1Each adjusting unit comprises a heating gas pipeline 1 and a gas adjusting branch pipe 5, the heating gas pipeline 1 is connected in parallel with the gas adjusting branch pipe 5, the heating gas pipeline is sequentially provided with an adjusting cock 2, an orifice box 3 and an exchange cock 4, the adjusting cock 2 is provided with a scale indication, the opening position of the cock can be seen during adjustment, and the scale range is 0-90°; the gas adjusting branch pipe 5 is sequentially provided with a stop valve (A) 6, an adjusting valve 8 and a stop valve (B) 7, the adjusting valve 8 is a pneumatic adjusting valve, which can be selected from a pneumatic single-seat adjusting valve, a pneumatic low-load adjusting butterfly valve and a pneumatic V-shaped adjusting ball valve, the normal adjusting flow of the adjusting valve is the difference between the normal heating gas flow of each branch pipe and the gas flow during the extension of the coking time, when the size and form of the adjusting valve are selected, the opening of the selected adjusting valve under the normal adjusting gas flow q0 is ensured to be between 50° and 70°, and the adjusting valve also needs to have a break signal maintaining function; the connection position of the exchange cock 4 and the orifice box 3 is connected with the other end of the stop valve (B) 7, and the input end of the adjusting cock 2 is connected with one end of the stop valve (A) 6. The orifice box 3 is provided with seven size orifices, which are respectively used during normal production, used for the side furnace during normal production, used for the edge furnace during normal production, used during the extension of the coking time, used for the side furnace during the extension of the coking time, used for the edge furnace during the extension of the coking time and used during the transition from the end of the baking to the normal heating; the orifices in the orifice box 3 are sequentially numbered from 1 to 7 from small to large, and the corresponding sizes are sequentially D1-D7 from small to large.

[0028] Working process:

[0029] 1) Orifice plate use

[0030] When the adjusting valve is manually adjusted or overhauled, the stop valve A (6), the stop valve (B) 7 and the stop valve C (9) are closed, and the adjusting cock 2 is opened to the full open state; at this time, the orifices in the orifice box are set as follows:

[0031] The No. 1 orifice plate is used for the edge furnace during the extension of the coking time, the No. 2 orifice plate is used during the transition from the end of the baking to the normal heating, the No. 3 orifice plate is used for the edge furnace during the normal production, the No. 4 orifice plate is used for the side furnace during the extension of the coking time, the No. 5 orifice plate is used during the extension of the coking time, the No. 6 orifice plate is used for the side furnace during the normal production, and the No. 7 orifice plate is used during the normal production.

[0032] When automatic adjustment is adopted, the stop valve A (6) and the stop valve (B) 7 are opened, the No. 1 orifice plate is used in the orifice box 3 of the adjusting unit close to the side furnace 1# and the adjusting unit close to the side furnace 62# on the other side, and the No. 5 orifice plate is used in the orifice box 3 of the 2#-61# adjusting units;

[0033] The reason for selecting the undersize (prolonged coking) orifice plate during automatic adjustment is that the coke oven has a large flow of heating gas during normal heating and a small flow of heating gas during prolonged coking, and the difference between the two flows is the flow range that the regulating valve 8 automatically adjusts. Since the regulating valve 8 is connected in parallel with the orifice plate box 3, when the regulating valve 8 is fully closed, it is equivalent to the flow of heating gas during prolonged coking, and when the regulating valve 8 is opened to a certain degree, the flow returns to the state during normal production. If the flow during prolonged coking is also to be adjusted, the opening of the regulating cock 2 should also be closed.

[0034] 2) Pressure transmitter configuration

[0035] Configuration 1, Figure 4 , as follows:

[0036] After the exchange cock 4 in the temperature adjustment unit of the single-hole combustion chamber 1-62#, a remote pressure transmitter is arranged respectively, as shown in Figure 2 and Figure 3 , the working mode of the mixed gas heating single-hole combustion chamber temperature adjustment system and the single-hole combustion chamber temperature-pressure cascade adjustment scheme adopted by the present application. The heating mode of the mixed gas is that the heating gas passes through the gas adjustment unit, passes through the waste gas shutter, and enters the combustion chamber through the potential chamber. Since the heating gas of each potential chamber enters the adjacent two combustion chambers at the same time, each adjustment unit will control the temperature of two combustion chambers at the same time in an exchange period. The exchange cocks 4 of the adjacent two adjustment units will be opened and closed alternately with the change of the exchange period. See Figure 2 When the first exchange period, the exchange cock 4 of the N# adjustment unit is opened, at this time, the PLC / DCS control system selects the switch HSn to be turned on, the deviation of the target temperature from the average temperature of the N# combustion chamber and the N+1# combustion chamber is taken as the input of the cascade main adjustment unit, the deviation of the output of the main adjustment unit from the measured value of the pressure transmitter 10 is taken as the input of the cascade auxiliary adjustment unit, and the output of the auxiliary adjustment unit is the valve position control value of the N# regulating valve 8. At this time, the adjacent N+1# regulating valve does not participate in the adjustment. See Figure 3When the next exchange cycle begins, the exchange cock 4 of the N# regulating unit is closed, the heating gas is cut off, at this time the selection switch HSn is disconnected (the selection switch HSn is set in the control system), the N# regulating valve 8 loses the control signal and will no longer participate in the regulation, because the regulating valve 8 has a signal breaking maintaining function, the opening degree at the end of the last exchange cycle will be maintained; the adjacent N+1# regulating unit exchange cock 4 is turned on, the gas enters the N# and N+1# combustion chambers through the regulating unit, at this time HSn+1 is turned on, the N+1# regulating valve will be PID cascade regulated by the temperature of the N# and N+1# combustion chambers and the pressure collected by the remote pressure transmitter 10 of the N+1# regulating unit; this configuration scheme and regulating method can solve the problem of combustion chamber temperature change lag and realize the fast, continuous and accurate regulation of the single-hole combustion chamber temperature.

[0037] Configuration 2, Figure 5 , as follows:

[0038] A pressure gauge 10 (P1) is arranged at the 1# regulating unit and the 62# regulating unit, and a pressure gauge 10 (P4) is arranged at the 2# and 31# regulating units. A pressure gauge 10 (P2) is arranged behind the exchange cock 4 of the 15# regulating unit, representing the pressure of each heating gas branch pipe in the front half of the heating gas main pipe. A pressure gauge 10 (P3) is arranged behind the exchange cock 4 of the 32# heating gas pipe regulating unit and the 62# heating gas pipe regulating unit, representing the pressure of each heating gas branch pipe in the rear half of the heating gas main pipe. The 1# regulating unit and the 62# regulating unit are arranged separately because the temperature fluctuation of the side combustion chamber is large, and the amount of regulation is larger than that of other combustion chambers, thus being considered independently. The function of the field pressure gauge is mainly to set the initial opening of the regulating valve 8 and the regulating cock 2 before the automatic regulation is put into use. Because of the large lag of the combustion chamber temperature change, if the initial opening is set unreasonably, the automatic regulation will be difficult to realize. Therefore, before the automatic regulation is put into use, the orifice plate of the required size is replaced, the 1# and 62# use the No. 1 orifice plate, and the 2#-61# use the No. 5 orifice plate. For the 1# and 62# regulating units, according to the readings of the pressure gauges 10 (P1) and 10 (P4), the opening of the regulating cock 2 and the regulating valve 8 is adjusted, so that the pressure gauges 10 (P1) and 10 (P4) are stabilized at the set pressure, and the regulating valve 8 is preferably between 50% and 70%. For the 2#-31# regulating units, according to the reading of the pressure gauge 10 (P2) of the 15# regulating unit, the opening of the regulating cock 2 and the regulating valve 8 is adjusted, so that the pressure gauge 10 (P2) is stabilized at the set pressure, and the regulating valve 8 is preferably between 50% and 70%. After the adjustment, the positions of the regulating cock 2 and the regulating valve 8 of the 15# regulating unit are recorded, and the regulating cokes 2 and the regulating valves 8 of the other 2#-31# regulating units are adjusted to the same positions. For the 32#-61# regulating units, according to the reading of the pressure gauge 10 (P3) of the 45# regulating unit, the opening of the regulating cock 2 and the regulating valve 8 is adjusted, so that the pressure gauge 10 (P3) is stabilized at the set pressure, and the regulating valve 8 is preferably between 50% and 70%. After the adjustment, the positions of the regulating cock 2 and the regulating valve 8 of the 45# regulating unit are recorded, and the regulating cokes 2 and the regulating valves 8 of the other 32#-61# regulating units are adjusted to the same positions. At this time, the readings of the pressure gauges 10 (P1)-10 (P4) are observed again, and if the deviation from the set value is not large, the automatic regulation is started. This way is adopted because in normal conditions, the heating gas pipe resistance of each combustion chamber is basically the same, or at least the heating gas pipe resistance of each combustion chamber in the front half and the rear half of the heating gas pipe is basically the same. Before the automatic regulation is put into use, the initial value needs to be set manually, which has a certain amount of work. The more pressure gauges are arranged, the more accurate the regulation is, but the more work is needed before the automatic regulation is put into use. Therefore, the configuration scheme of Figure 5 is usually adopted. If the conditions allow, the configuration scheme of Figure 4The scheme of configuring the remote pressure gauge is the best; the pressure set value P can be calculated according to the following formula:

[0039]

[0040] In the formula 1, P0 is the design value of the heating gas main pipeline pressure, K is the orifice resistance coefficient, which is related to the size of the orifice and the heating gas pipeline, and can be obtained by table lookup. ρ0 is the gas density under standard conditions, w0 is the design value of the gas branch pipeline flow rate, and t is the gas temperature.

[0041] The utility model discloses an original heating gas pipeline is improved, and on the basis of not changing the equipment on the heating gas pipeline (the equipment includes the adjusting plug, the orifice box, the exchange plug), adopts the adjusting valve and the parallel connection of heating gas pipeline, has guaranteed the independence of manual regulation, has improved the mixing gas heating each combustion chamber furnace temperature regulation effect, the orifice box is equipped with a variety of orifice with different diameter, can satisfy the need of manual regulation, has reduced the manual operation amount in the dangerous area of coke oven basement greatly, has reduced the labor cost, is helpful to the health and safety of the repair personnel.

Claims

1. A mixed gas heated single-hole combustion chamber temperature regulation system, characterized by, The adjusting unit is connected with the mixed heating gas main pipe at one end and connected with the corresponding waste gas shutter at the other end, so that the mixed gas passes through the mixed heating gas main pipe, the corresponding adjusting unit, the corresponding waste gas shutter and the corresponding regenerator in sequence and enters the corresponding combustion chamber.

2. A mixed gas heated single port combustion chamber temperature regulation system according to claim 1, wherein, The single-side heating coke oven is provided with N+1 adjusting units, and the double-side heating coke oven is provided with 2N+2 adjusting units, wherein N is the number of combustion chambers.

3. A mixed gas heated single port combustion chamber temperature regulation system according to claim 1, wherein, The adjusting unit comprises a heating gas pipe and a gas adjusting branch pipe, the heating gas pipe is connected with the gas adjusting branch pipe in parallel, the heating gas pipe is sequentially provided with an adjusting cock, an orifice box and an exchange cock, and the gas adjusting branch pipe is provided with an adjusting valve.

4. A mixed gas heated single port combustion chamber temperature regulation system as defined in claim 3 wherein, One end of the adjusting valve is connected with the input end of the adjusting cock, and the pipeline connection of the exchange cock and the orifice box is connected with the other end of the adjusting valve.

5. A hybrid gas heated single port combustor temperature regulation system as defined in claim 3, wherein, The output end of the exchange cock is provided with a pressure transmitter, and the orifice box is provided with multiple orifice plates with different sizes, and the number of orifice plate types is greater than or equal to 7.

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