DE2445900A1 - IMPROVED PROCESS FOR GENERATING INERT GAS AND INERT GAS GENERATOR FOR CARRYING OUT THE PROCESS - Google Patents

Description

Improved Inert Gas Generation Process and Inert Gas Generator to carry out the procedure; The invention relates to a method of production of inert gas, - whereby liquid or gaseous hydrocarbonates with combustion air, optionally with the addition of an atomizing agent, in a combustion chamber are burned, and immediately following the combustion, a first shock-like one Cooling, in particular spray cooling, is carried out, followed by a second cooling and washing takes place according to patent (patent application P 24 24 064.0).

Inert gas, which is generated by the method according to the invention, finds mainly in tanker shipping and in transport to neutralize empty tanks and to create an inert atmosphere in filled tanks. But it is also used for fire extinguishing and as * protective gas when transporting perishable Goods like æ.B. Fish meal, and according to usable in cold stores and the like According to the parent application, the inert gas generated is initially in the rear part of a combustion chamber sc.hock-like cooled by spraying the inert gas from spray nozzles immediately after the combustion is cooled down.

The inert gas then flows into a scrubber (scrubber and giant oil cooler), in which it is vertically upwards flows and is withdrawn overhead. The scrubber is filled with Raschig rings or other suitable packing. The cooling water itself enters from above and is fed through a suitable nozzle over the The cross-section of the scrubber is distributed and the gas flows in countercurrent. To The cooling water in the sump of the scrubber is collected via a pump into a commercial cooler, e.g. B. Freon cooler, promoted from which it back again flows into the scrubber. In the inert gas generator according to the parent application a gas with a very low water content and a correspondingly low dew point won.

As practical tests have shown, the inert gas generator works completely satisfactory according to the parent application. However, it turned out that the generator is used to produce relatively "moist" inert gas, which for many purposes is sufficient, is too expensive or is insufficient for these special purposes Possesses efficiency.

In particular, the # operation of the scrubber is relative for several reasons expensive. These relative disadvantages are: - a scrubber only works economically, when the gas and water quantities are optimally adjusted to one another. They are different amount of gas flowing through, then the flowing through would have to maintain the optimum Corrected amount of water.

Every S ~ rubber works according to its volume and its filling quantity with a certain optimal flow rate. If the pressure exceeds the If the gas flow has a permissible value, the trickle water is in a transverse direction to the tower kept lying layer (exceeding the flood limit). The gas just gets in larger bubbles, if any, to the head of the scrubber. Conversely, if there is too much water used, the scrubber is uneconomical.

- The bottom layer of the scrubber filling gets very hot through Combustion gases touches and must therefore consist of highly heat-resistant packing. Such fillings (e.g. fillings made of stainless steel according to DIN 1.4404 or AISI 316 L) are very expensive.

- The packing in the scrubber will crush after a certain time mutually what, according to experience, the limit value of the gas pressure for the flood limit belittles.

- With large quantities of inert gas and limited construction height (e.g. on ships) a large diameter scrubber is required, resulting in relatively expensive clay structures leads.

It is therefore the task of a method and an inert gas generator specify that does not require a scrubber downstream of the combustion chamber and Nevertheless, an inert gas results that has a dew point of + 300 C, for example and therefore without further is acceptable for many purposes. For example such a "humid" inert gas for crude oil tankers is easily possible to neutralize empty tanks.

Of course, the range of uses of the is in accordance with the procedure generated inert gas is not limited to this use. It's a job of the person skilled in the art to select the inert gas according to its application requirements.

The improvement of the process is therefore that on the scrubber is waived. Therefore, according to the invention, the required first and second Cooling of the generated inert gas carried out as spray cooling, preferably a flow of cooling water fed from the same source is used.

In order to simplify in particular what is required for the 'procedure Inert gas generator performs the procedure that the first and second cooling take place inside the combustion chamber and a combustion chamber extension. This will the space required by the inert gas generator is better used, by omitting the Scrubbers results in a much more compact system than with the device According to the parent application, In order to more easily dehumidify the inert gas, the speed is of the gas in the second cooling chamber or combustion chamber expansion to at least 25% the speed in the combustion chamber is reduced, with the change in volume due to Cooling is taken into account. ZF r1cbflüt of the process is a suitable one Inert gas generator, which is equipped with a double jacket combustion chamber, the jacket of which is covered by cooling water is flowed through and the spray nozzles close to the gas outlet for the outlet of cooling water from the double jacket into the combustion chamber interior, such Double jacket combustion chamber also used in the device according to the parent application became. What is new according to the invention is that a second is attached to the combustion chamber interior Connected to a cooling room, on the walls of which spray devices (spray nozzles, spray heads) are arranged, which are fed through the double jacket cooling water. It has been found that the intensive spraying of the inert gas is very good Wash effect enables. Soa½ 'in particular is practically completely removed.

For some purposes, however, it is desirable to check the dew point of the obtained Further reduce gas. For this purpose it is proposed to use either the won Gas noöhmals to supply a cooling space designed as a spray or trickle cooler. However, it is also possible to use part of the cooling water, in particular the second Cooling chamber to lead in a separate cooling circuit, the latter in this A cooler is included in the cooling circuit, which keeps the cooling water at a very low level Temperature brings.

In particular, a construction is proposed for this purpose in which the part of the second cooling chamber through which the gas lasted has a collecting and Bbl eit ungsvorrichtung is provided through which the separately discharged cooling water is separated from the rest of the cooling water flow.

The description is based on a drawing, the figures of which show: Figure 1 shows an inert gas generator according to the invention; Figure 2 one in the combustion chamber interior pointing spray nozzle; FIG. 3 a pointing into the interior of the second cooling chamber Spray nozzle; Figure 4 shows a further embodiment of the spray cooler.

To carry out the method according to the invention and within the Inert gas generator according to the invention can have a burner and a control method They are used, for example, in the German Offenlegungsschriften 2,320,442 and 2,246,742 are explained in more detail. In this respect, the Revelation referred to in these scriptures.

In the figure 1, an inert gas generator is shown in which in On the left side of the picture a two-stage burner in a closed, cylindrical housing 20 is arranged with the hydrocarbonates, in particular heating oil, are burned. An atomizing medium (air, gas, inert gas or steam) is supplied via a line 2 fed. In order to be able to preheat this atomizing air, the line 2 is through the combustion chamber out. Combustion air is parallel over a Line 30 is fed to the burner 20.

The flame jet produced and the hot combustion gases pass through one Extension 3 into the actual combustion chamber interior 22. The combustion chamber interior is cylindrical and surrounded by a double jacket 21.

The #double jacket 21 also serves as a cooled wall of the interior and as a feed for the cooling water to be sprayed by spray elements. The cooling water is used especially in ships of the sea or another suitable cooling water reservoir taken.

The rear part of the double jacket in the direction of flow of the gas 21 carries spray nozzles 23 on the inside, which are shown in detail in FIG are.

The water passes through the spray nozzles 23 in finely divided form the interior 22 and causes a first, shock-like cooling of the hot fuel gases.

While it was suggested in the documents of the parent application, now to feed the cooled inert gas to a scrubber, is in the present Registration selected a different procedure. As can be seen from Figure 1, there is a second one around the double jacket and the opening of the actual combustion chamber Cooling space 5 built around, the walls of the cooling space 5 forming a double jacket 21 concentric cylinder form, at least the rear part of the actual Combustion chamber encloses. The combustion chamber and second cooling chamber are inclined to the horizontal, so that there is a lowest point of the second cooling chamber. In its area a gas-tight water drain 24 is arranged. The front and rear walls of the second Cooling space 5 are closed by end walls 6, 7. The end wall 7 has a so-called Mannlochw voltage 8, through which the interior of the second cooling space and of the combustion chamber interior 22 are accessible.

As sketched in FIG. 1, the cooled fuel gases escape the opening 9 of the interior 22 in the second cooling space, are in their direction turned around and passed a second spray nozzle arrangement with spray heads 10. The spray heads 10 are shown in detail in FIG.

When sweeping past the spray heads 10, the inert gas becomes a second Times passed through a stream of spray water and cooled further. In the passages the gas is also washed by the spray water, in particular largely from the admixed gas SO, cleaned. In the area of the spray heads 10 is the speed of the inert gas significantly reduced compared to the speed in the combustion chamber itself, so that the gas only entrains a little cooling water. The dripping cooling water arrives to the lowest point of the refrigerator 5 and, as already described, into the drain 24. The largely dry inert gas (dew point close to the cooling water temperature, i.e. at about 300 ° C) reaches a Consumption station or in a further drying cycle, such as that for example is described in detail in the parent application (elements 1 to 9).

As FIGS. 1 and 3 show, the spray heads 10 of the in the double jacket 21 charged flowing cooling water. So it is not a second water cycle required, which further lowers the cost of the present inert gas generator.

The spray heads -10 consist of an elongated one in the double jacket screwed in cylinder sleeve 13, those with transverse to the axis, sharp-edged slots 14, 15 is provided. The slots point against the direction of flow of the incoming inert gases. The sleeves have different heights, so that one as possible Even and complete room coverage by cooling water in the second cooling room he follows.

It can be assumed that at the end of the combustion chamber interior (Opening 9) the inert gas has a temperature of about 200 C above the cooling water temperature Has. After passing through the second cooling chamber, the inert gas is again finely divided Cooling water is cooled down to a temperature which is approximately the temperature of the cooling water is equivalent to. With the complete penetration of the inert gas flow it is also achieved that. the gas is largely freed from sulfur dioxide. Through the rapid and complete Discharge of the sprayed and contaminated wash water is also achieved that the corrosion in the area of the spray nozzles and the second cooling chamber is almost complete can be avoided. This point of view is particularly for use of sea water as cooling water is very essential. Water drainage can be achieved here achieve both in the inclined arrangement according to Figure 1 as well as in a Vertical arrangement of the generator as required for various installation purposes may be. Since the spray system works at water pressures of 0.3 to 0.5 kl cm, the pressure being above the inert gas must, can be with everyone Any arrangement with simple pumps can achieve this pressure.

Another embodiment of the spray cooler is shown in FIG. The second cooling space 5 here has a subdivision, which is partially open wall 31 is given. The gas, which has already been largely cooled and cleaned, arrives through an opening 32 in the separate cooling chamber 33, in which there are also spray heads 34 are located.

However, the cooling water sprayed from the heads 34 does not get into the drain 24, but into a separate drain 35, from there into a pump 36 and in a cooler 37, in which the cooling water is cooled to about 0o. That especially Frozen cooling water then reaches the spray heads 34 again.

The cooling water provided with the low temperature enables that the dew point of the inert gas is further reduced. The chosen construction thus offers in a simple way a possibility for improvement, which for another Quality improvement of the extracted natural gas ensures.

Claims (12)

P a t e n t a n s p r ü c h e 1. Process for generating inert gas, liquid or gaseous Hydrocarbonates with combustion air, optionally with the addition of an atomizing agent be burned in a combustion chamber, directly following the combustion a first shock-like cooling, in particular spray cooling, is carried out, whereupon a second cooling and washing takes place, according to patent (patent application P 24 24 064.0), characterized in that the first and the second cooling are preferably spray cooling take place with a cooling water flow fed by the same source, 2. Procedure according to claim 1, characterized in that the first and second cooling inside the combustion chamber and a combustion chamber extension take place. 3. The method according to claim 1 and 2, characterized in that the Speed of the inert gas in the second cooling chamber or combustion chamber extension is reduced to at least 25 Xo of the speed in the combustion chamber, 4th Inert gas generator for carrying out the method according to claim 1, with a double jacket combustion chamber, whose jacket is traversed by cooling water and the one close to the gas outlet Spray nozzles for the exit of cooling water from the double jacket into the interior of the combustion chamber has, characterized by one adjoining the combustion chamber interior ~ (22) second cooling room (5), on the walls of which spray devices (10, 23) are arranged are, which can be fed through the double jacket (21) guided cooling water. 5. Generator according to claim 4, characterized by a closed, second cooling space (5), the at least the combustion chamber opening (9) and part of the Combustion chamber jacket (21) surrounds the cooling space from which the combustion chamber interior (22) incoming inert gas is flowed through, the flowing through the cooling chamber (5) Gas is permeated by spray water. 6. Generator according to claim 4 and 5, characterized in that the second cooling chamber (5) as concentrically enclosing the combustion chamber double jacket (21) Cylinder is formed. 7. Generator according to claim 5 and 6, characterized by directly spray nozzles (23) or spray heads mounted in or on the wall of the double jacket (10). 8. Generator according to claim 7, characterized by elongated sleeves (13) as the spray elements of the spray heads (10), the one at right angles to the sleeve axis arranged slits intersecting the cross-sectional area of the sleeves as a tendon (14, 15) are provided. 9. Generator according to claim 5 to 7, characterized by the plane Horizontal inclined arrangement of the combustion chamber with surrounding second cooling space (5) and a drain at the lowest point of the cooling chamber (5) for the used Cooling water. 100 generator according to claim 1, 2 and 5, characterized in that part of the cooling water is conducted in a separate cooling circuit. 11. Generator according to claim 10, characterized in that the last the gas flows through part (33) of the second: ühlraumes with a collection and discharge device (31, 35) is provided, through which the cooling water to be discharged separately from the rest Kühiwasserstrom is separable. 12. Generator according to claim 1 and 2, characterized in that the Gas flow after exiting the second cooling room to a third one, as spray or trickle cows ler designed cold room can be supplied.