JPS5817518B2 - Oil gas generation method and device for city gas - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an oil gas generation method fS and a generator suitable for city gas.

With an oil and gas production apparatus using a continuous partial combustion method using hydrocarbon as a raw material, it is possible to obtain gas of approximately 2.000 ktj/Nrrl by sucking air as an oxidizing agent into a reactor at normal pressure.

This method is widely used because by adding a high-temperature potential gas to this gas to adjust the calorific value, a gas having predetermined combustion characteristics can be obtained.

However, the following problems are inherent in the production of oil and gas by such a partial combustion method.

■ Since the water used for cooling and washing the manufactured gas is often contaminated and has a strange odor, it is necessary to use higher quality and more expensive raw materials than in cyclic plan 1~.

Therefore, operating costs are high. (2) If the system has a CO shift device, it will also have an adverse effect on the CO shift catalyst, shortening the life of the catalyst.

■ Gum-like substances may be contained in the supply gas, which may have an adverse effect on the supply and on the combustion appliances in the demand room.

The present invention provides an oil and gas generation method for producing city gas having almost the same combustion characteristics as oil and gas obtained by the partial combustion method without the above-mentioned troubles, and an apparatus for carrying out the method.

Next, the present invention will be explained in detail.

In an oil-gas converter having a contact reactor 1 and a waste heat boiler 2, feedstock hydrocarbons are introduced into the furnace through a valve 3, and process steam is introduced through a valve 4.

On the other hand, heating fuel passes through valve 5, heating air passes through valve 6, and is guided into the furnace by each line.

The reactor is operated by an cyclic method that repeats the production period and the heating period. During the production period, valves 3 and 4 are opened to introduce raw materials and process steam into the furnace, and during the heating period, valves 5 and 6 are opened. Then, heating fuel and heating air are introduced into the furnace.

When the converted gas during production passes through the waste heat boiler 2, it is sent to the CO converter 12 via the valve 10, and the converted gas passes through the waste heat boiler 2.
When the waste heat is bypassed, it is sent to the CO transformer 12 via the valve 9, and then in both cases it passes through the waste heat boiler 13 of the CO transformer to the water seal 14.

At this time, the valve 29 provided in the line connecting the waste heat boiler 2 and the water seal 14 is closed.

Reference numeral 11 is a valve for introducing quench water or CO conversion steam.

- During the heating period, the wells 5 and 6 are opened, heating fuel and heating air are introduced into the furnace, and the temperature inside the furnace is raised to the reaction temperature required for producing converted gas during the production period.

After the combustion generated gas during this heating period passes through the waste liquid boiler 2,
Conventionally, it was discharged into the stack 8 via the stack valve 7.

In the present invention, the heating amount generated gas is separated, separately mixed into the steam-transformed gas, and then the heating amount is adjusted to the required amount of heat.

An example of the embodiment is that after the heated amount generated gas leaves the waste heat boiler 2, it branches off from a line leading to the stack valve, passes through the valve 15, the booster 16, and the water seal 17, and is fractionated. .

The valve 15 is for opening/closing to separate the required amount of heated gas, and the heated gas is connected to the steam converted gas line 21 or the booster 16 through a line that only has a booster 16 and a water seal 17. It may be connected to the water seal 14 from
Or booster 16, water seal 17 and gas holder 1
8, and then an on-off valve 19 and a flow rate adjustment valve 20.
The connection 21 may be made to the converted gas line via a line provided with.

In the scrubber 22 after the convergence of the converted gas line and the heated amount generating gas line, the converted gas and the heated amount generated gas are cleaned and mixed, and then in the mixer 23, the amount of heat is finally adjusted to the required amount.

That is, the amount of heat at 24 is detected by a calorimeter, and the signal from the amount of heat controller 26 is sent to the dilution air valve 27 to adjust the amount of heat.

25 is a supply valve for high-temperature gas, and 28 is a holder for final mixed gas.

Now, to explain how to use the oil and gas generator according to the present invention, the converted gas produced during the production period usually passes through a waste heat boiler and then is sent to a CO converter to reduce CO in the converted gas. After that, it is sent to the scrubber 22 via the water seal 14.

If the CO conversion device is to be bypassed if necessary, the waste heat is led to the scrubber 22 through the waste heat boiler 2, the vent valve 29, and the water seal 14.

On the other hand, during the heating period, for example, when the start of the heating period is detected by the opening operation of the heating fuel valve 5 and the valve 15 is opened, the heating amount generated gas can be separated into the branch line through the booster 16.

However, in this type of oil and gas generator, it is usual to arrange two rows of gas generators in parallel, and have the CO shift converter and subsequent parts as common equipment.

If the phases of the heating period and manufacturing period of the two plants are reversed, the start of the heating period of one plant will be the start of the manufacturing period of the other plant, so the metamorphic gas line will be connected almost continuously to the metamorphic gas line during the production period. Gas is delivered.

Therefore, if the two units A and B are currently operating as a pair, when the heating amount generated gas for the A unit can be separated, this period is the production period for the B unit, and the amount of gas produced by the B unit is The converted gas is transferred from the water seal 14 to the scrubber 22.
This means that it is being sent to.

In the present invention, the heating amount generated gas is separated and pressurized, and then mixed into the steam conversion gas line at a constant flow rate.

At this time, the amount of heated gas to be mixed in with respect to the amount of converted gas produced per cycle may be set by the opening time of the valve 15 or by the opening degree of the valve 15.

Needless to say, the excess heating amount generated gas can be released from the stack 8 as appropriate.

As another embodiment, when the heated amount generated gas is separated and the booster 16, the water seal 17, and the gas holder 18 are provided, after the heated amount generated gas is separated into the branch line, the gas holder 18 It will be press-fitted into the

In this case, the amount of gas generated during the heating period that should correspond to the amount of metamorphic gas produced in one cycle may be determined in advance, and the fixed amount may be stored in the gas holder.

Next, the stored gas passes through a line equipped with an on-off valve 19 and a flow rate adjustment valve 20 from the gas boulder 18, and is mixed into the converted gas line at 21 during the production stage.

In other words, a fixed amount of heating amount generated gas is mixed into the converted gas via the gas holder 18 when the oil and gas generator is in single unit operation and the converted gas flow is cyclically intermittent.

In this case, the heating amount generated gas is stored in the gas holder 18 during the heating period of the reactor, and the gas holder 18 is stored during the manufacturing period.
The heated amount generated gas stored in 8 is mixed into the converted gas.

The on-off valve 19 and the flow rate adjustment valve 20 are useful for this purpose, and the gas holder needs to maintain its own pressure enough to mix into the converted gas line.

Alternatively, the holder capacity may be set to a capacity greater than the amount of converted gas produced in one cycle, and the amount of heated gas produced in each cycle may be determined as a constant amount required for mixing.

Alternatively, the valve 19 can be provided with various control devices, such as one that detects the end of the production period (for example, closing the raw material hydrocarbon valve 3) and closes it.

The present invention can be widely applied to obtain city gas having desired combustibility.

That is, it is possible to mix the amount of metamorphosed gas and the gas produced during the heating period in any ratio, and moreover, very smooth operation of the system as a whole is guaranteed.

For example, in a method that uses a partial combustion method in combination with a cyclic catalytic cracking method, that is, a method in which process air is introduced during the production period, there are restrictions on the ratio of process air amount/feedstock hydrocarbon amount, and the continuous partial combustion method It is not possible to obtain a wide range of gases with combustibility equivalent to that of the gases rS
stomach.

Furthermore, it is not possible to completely overcome the draft in the partial combustion method described at the beginning.

Furthermore, a method known as the closed flow method in which the generated gas at a certain heating level is mixed into the converted gas through the water sealer 14 with the stack valve 7 closed is also considered, but there is no complete guarantee of safety with this method. There remains a concern.

Furthermore, the oil and gas generator according to the present invention has an advantage in terms of equipment, particularly in that it is not necessary to install a large-capacity holder for gas mixing that should be provided in front of the heat regulator.

Also, considering the necessity of operating a single reactor, the installation of a large-capacity holder must always be considered; however, when using the present invention, the gas holder to be installed is necessary for one cycle of mixing. A small capacity one is sufficient.

If the facility design does not allow for single-unit operation,
The gas holder is also omitted, and a relatively simple equipment in which the water seal 17 and the water seal 14 are shared is sufficient, and this advantage is extremely significant.

Furthermore, the gas generated during the heating period to be mixed into the metamorphic gas is known to have fl properties that are particularly useful for gas mixing.

In other words, even if the NOx concentration is low and, for example, naphtha is used as heating/fuel and the excess air ratio is 1.35,
The oxygen concentration in the combustion gas is very low at 1 to 2%.

This is brought about by the repeated oxidation-reduction action of heavy metals such as N1 used as shift conversion catalysts, and by mixing the generated combustion gas at such a heated amount with shift gas, gas, troubles can be prevented, and combustibility can be improved. This has a very significant effect on stabilizing the

Thus, the present invention ensures the safe production of oil and gas suitable as city gas.

An example of the mixing result of the gas produced during the heating period with respect to the converted gas is as follows.

Table 1 shows the properties of the metamorphic residue, and Table 2 shows the properties of the gas produced during the heating period.
As shown in the table, the mixing ratio of both gases is 60:40, and the ratio is approximately 1
4,500 kr after heating with 0% butane? Table 3 shows the properties of the mixed gas when dilution air was added so that the ratio was i/Nm.

[Brief explanation of the drawing]

The drawings are flow sheets illustrating embodiments of the invention. 1... Reactor, 2... Waste heat boiler,
7...Stack valve, 8...Stack,
12... CO transformer, 13... CO transformer waste heat boiler, 15.19... Valve, 16.
...boost machine, 14.17 ... water sealer, 1
8.28...Gas holder, 20...
Flow rate adjustment valve, 22... Scrubber, 23...
...Calorie regulator, 24...Calorimeter, 25...
...High heat potential gas valve, 26...Calorific value controller.

Claims (1)

[Scope of Claims] 1. In an oil and gas generator that generates steam converted gas from f and f by alternately repeating production and heating periods, the heating period generated gas is a constant proportion of the amount of converted gas during each production period. After separating and separately mixing it into steam converted gas,
A method of generating oil and gas for city gas that adjusts the calorific value to the required calorific value. 2. In an oil and gas generator that generates steam converted gas while alternating between production and heating periods, a certain proportion of the heating period generated sludge is transferred from the line after passing through the waste heat boiler to the amount of converted gas during each production period. Separate, Shōōki,
An oil gas generator for city gas that mixes steam converted gas through a line equipped with a water sealer and then adjusts the calorific value to the required calorific value. 3 The gas generated during the heating period is separated from the line after passing through the waste heat boiler, connected to a booster, water seal, and gas holder, and then mixed into the steam converted gas through a line equipped with an on-off valve and a flow rate control valve. An oil and gas generator for city gas according to claim 2.