CN215480754U - Chilling chamber of gasification furnace and gasification furnace - Google Patents

Abstract

The utility model relates to a cooling system of a gasification furnace, discloses a chilling chamber of the gasification furnace, and further relates to the gasification furnace. The chilling chamber of the gasification furnace comprises a descending pipe (1) and an ascending cylinder (2) which is sleeved on the outer side of the descending pipe (1) and has a gap with the outer side surface of the descending pipe (1), wherein the ascending cylinder (2) comprises an upper section, a transition section and a lower section which are sequentially connected from top to bottom, the upper port of the upper section is higher than the liquid level of a slag water pool, the lower port of the lower section is lower than the lower port of the descending pipe (1), the diameter of the lower section is larger than that of the upper section, and the transition section is of a circular truncated cone structure. The utility model has the advantages of reducing disturbance of gas to the liquid level in the chilling chamber, improving the accuracy and online period of liquid level meter measurement, increasing turbulent washing, improving separation efficiency and avoiding the problems of water carrying and large ash carrying of crude gas.

Description

Chilling chamber of gasification furnace and gasification furnace

Technical Field

The utility model relates to a cooling system of a gasification furnace, in particular to a chilling chamber of the gasification furnace, and further relates to the gasification furnace comprising the chilling chamber of the gasification furnace.

Background

The coal gasification technology is a core technology for clean and efficient utilization of coal, and the gasification furnace is a key core device of the coal gasification technology. The high-pressure and large-capacity entrained flow gasification technology is one of the internationally advanced coal gasification technologies and is widely applied to the coal chemical industry. At present, a quenching chamber of an entrained flow gas furnace adopts a mode of quenching or a waste boiler to cool crude gas and ash. Because the waste boiler has the problems of high investment cost, easy slag bonding and the like, enterprises adopt fewer waste boiler gasification furnaces. The cooling main process of the chilling type gasification furnace comprises the following steps: high-temperature synthesis gas and slag generated in the reaction chamber of the gasification furnace descend from the gasification reaction chamber to enter a descending pipe of the chilling chamber, exchange heat with water in the descending pipe, are cooled and humidified, and are cooled in the descending process and solidified into solids in water bath. Most of ash slag is washed away by the synthetic gas in the water bath of the chilling chamber, bubbles rise, and the synthetic gas is discharged out of the furnace from the side wall of the chilling chamber.

When the gasifier runs, when gas passes through the liquid level of the slag pool, the liquid level of the chilling chamber is difficult to measure accurately due to the reasons that the gas impacts the liquid level to cause liquid level disturbance, bubbles carry liquid, and high-temperature gas exchanges heat with chilling water to generate steam to cause false liquid level.

In view of the above, there is a need to design a gasifier quench chamber.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a chilling chamber of a gasification furnace, which can reduce disturbance of gas to the liquid level in the chilling chamber and improve the measurement accuracy of a liquid level meter.

The utility model further aims to solve the technical problem of providing a gasification furnace, wherein a quenching chamber of the gasification furnace has the advantages of reducing disturbance of gas to the liquid level in the quenching chamber, improving the measurement accuracy and online period of a liquid level meter, increasing turbulent washing, improving the separation efficiency and avoiding the problems of water carrying and large ash carrying of crude gas.

In order to achieve the technical problem, the utility model provides a gasifier chilling chamber, which comprises a downcomer and an ascending cylinder, wherein the ascending cylinder is sleeved outside the downcomer and has a gap with the outer side surface of the downcomer, the ascending cylinder comprises an upper section, a transition section and a lower section which are sequentially connected from top to bottom, the upper port of the upper section is higher than the liquid level of a slag pool, the lower port of the lower section is lower than the lower port of the downcomer, the diameter of the lower section is larger than that of the upper section, and the transition section is in a circular truncated cone structure. The utility model reduces the air flow speed in the descending pipe by additionally arranging the ascending cylinder, so that the gas has larger contact area with slag water, and the heat exchange and washing efficiency of the crude gas is improved.

Preferably, the inner wall of the ascending barrel and/or the outer wall of the descending pipe are/is provided with a bubble breaking device.

Specifically, the bubble breaking device is a fin, and the inner wall of the ascending cylinder is provided with a plurality of layers of fins.

More specifically, the outer wall of the downcomer is provided with a plurality of layers of fins.

Further, the fin radial dimension is greater than one eighth of the spacing between the downcomer and the riser and less than one quarter of the spacing between the downcomer and the riser.

Preferably, a baffle plate is arranged on the outer peripheral surface of the downcomer in a surrounding manner, the baffle plate is positioned above the upper port of the ascending barrel, and the diameter of the outer circle of the baffle plate is larger than that of the upper section of the ascending barrel.

Specifically, the outer edge of the baffle plate is arranged in a downward inclined mode, and the included angle between the outer edge of the baffle plate and the axis of the ascending cylinder is 20-60 degrees.

Preferably, the diameter of the upper section of the ascending cylinder is 48% -56% of the diameter of the chilling chamber, and the diameter of the lower section of the ascending cylinder is less than 70% of the diameter of the chilling chamber.

Specifically, the lower edge of the lower section of the ascending barrel is connected with the gasification furnace shell through a plurality of connecting pieces.

The utility model also discloses a gasifier comprising the gasifier quench chamber according to any one of the above technical schemes.

Through the technical scheme, the utility model has the following beneficial effects:

the gasifier chilling chamber is additionally provided with the ascending cylinder on the basis of the traditional gasifier chilling chamber, the ascending cylinder is arranged on the outer side of the descending pipe and has a gap with the outer side of the descending pipe, the ascending cylinder can guide high-temperature synthetic gas such as crude gas to move upwards in the gap between the ascending cylinder and the outer side of the descending pipe, the upper end of the ascending pipe is higher than the upper end of the liquid level of the slag pool, so that the outlet of the gas in the chilling chamber is higher than the liquid level of the slag pool, the interference on the water level of the chilling chamber outside the protective cylinder is avoided, the guarantee is provided for the liquid level stability of the chilling chamber, and the engineering problems of liquid level alarm and vehicle skip caused by liquid level fluctuation are prevented; the transition section is in a circular truncated cone structural design, so that gas entering the ascending pipe is gradually accelerated, and the problems of large liquid level disturbance and the like caused by sudden change of the gas speed are avoided.

The baffle plate is arranged on the outer side of the descending pipe, the baffle plate circumferentially surrounds the outer side of the descending pipe and is higher than the upper end of the ascending cylinder, and after the crude gas in the ascending state and water and ash carried by the crude gas collide with the baffle plate, the crude gas is separated from the water and ash carried by the crude gas again, so that the slag-water separation efficiency of the chilling chamber of the gasification furnace is improved.

The inner wall of the ascending cylinder and the outer wall of the descending pipe are provided with the bubble breaking device, the bubble breaking device is lower than the baffle plate, bubbles generated by violent reaction in the chilling chamber are broken, the washing effect is improved, and the gas-slag separation efficiency is improved.

In addition, the bubble breaking device is arranged into fins, the fins are simple in structure, the installation difficulty is reduced, and the supporting plate is arranged to fix the ascending barrel in the chilling chamber.

Additional features and advantages of the utility model will be set forth in the detailed description which follows.

Drawings

The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the principles of the utility model and not to limit the utility model. In the drawings:

FIG. 1 is a schematic structural view of a quench chamber of a gasifier according to an embodiment of the present invention;

FIG. 2 is a schematic flow diagram of a gasifier quench chamber employing a riser according to an embodiment of the present invention;

FIG. 3 is a schematic view of the phase content of the quench chamber of the gasifier at a gas velocity of 3.2m/s in the downcomer;

FIG. 4 is a schematic view of the quench chamber phase content of a gasifier at a gas velocity of 2.3m/s in the downcomer.

Description of the reference numerals

1 down pipe 2 up tube

3 baffle plate 4 bubble breaking device

5 connecting piece

Detailed Description

In the present invention, in the case where no contrary explanation is made, the terms of orientation or positional relationship indicated by the terms of "outer", "upper", "lower", "inner", "outer", etc. are used based on the orientation or positional relationship shown in the drawings, and are only used for convenience of describing the present invention and for simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention; the directional terminology of the present invention should be understood in conjunction with the actual installation state.

In the description of the present invention, it should be noted that, unless otherwise explicitly stated or limited, the terms "connected," "disposed," "provided," and "sleeved" are to be understood broadly, for example, the connection may be a direct connection, an indirect connection via an intermediate medium, a fixed connection, a detachable connection, or an integral connection; either directly or indirectly through intervening connectors, either internally or in cooperative relationship to each other. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

The following detailed description of the present invention is provided in conjunction with the accompanying drawings, and it is to be understood that the detailed description is provided for purposes of illustration and explanation and is not intended to limit the scope of the utility model.

As shown in fig. 1, fig. 1 is a schematic view of an overall structure of a specific embodiment of a quench chamber of a gasifier of the present invention, the quench chamber of the gasifier mainly includes a downcomer 1 and an ascending cylinder 2, wherein the ascending cylinder 2 is located outside the downcomer 1 and is spaced from an outer side surface of the downcomer 1, the ascending cylinder 2 includes an upper section, a transition section and a lower section which are sequentially connected from top to bottom, an upper port of the upper section needs to be higher than a liquid level of a slag water pool in the quench chamber of the gasifier, a lower port of the lower section needs to be lower than a lower port of the downcomer 1, and a diameter of the lower section is larger than a diameter of the upper section. In addition, the structure of the transition section is a circular truncated cone-shaped structure. According to the utility model, the flow direction of the gas flow is controlled by adding the ascending cylinder 2 on the outer side of the descending pipe 1 in the chilling chamber of the gasification furnace and enabling a gap to exist between the ascending cylinder 2 and the descending pipe 1, because the lower port of the lower section of the ascending cylinder 2 is lower than the upper port of the descending pipe 1, the gas in the descending pipe 1 automatically enters the interval between the descending pipe 1 and the ascending cylinder 2 and flows upwards when flowing downwards to the lower port of the descending pipe 1, and the upper port of the upper section of the ascending cylinder 2 is higher than the normal liquid level of a slag water tank in the chilling chamber of the gasification furnace, so that unstable factors caused by gas-liquid heat exchange or gas flow movement are controlled in the ascending cylinder 2, the interference of the gas flow on the liquid level in the chilling chamber is reduced, and the measurement accuracy and the online period of a liquid level meter are improved. The transition section is designed into a circular truncated cone structure, so that the air flow velocity of the air entering the ascending barrel 2 can be gradually increased, and the problem of large liquid level disturbance caused by sudden change of the air flow velocity is avoided.

Referring to fig. 2, fig. 2 is a schematic flow direction diagram of gas flow after the gasifier quench chamber of the embodiment of the utility model adopts the ascending cylinder, and as shown in the figure, the gas flow runs downwards along the descending pipe 1, reacts with a slag water pool in the gasifier quench chamber when the gas runs to the lower port of the descending pipe 1, is guided by the ascending cylinder 2, and runs upwards along the interval between the ascending cylinder 2 and the descending pipe 1. The chimney 2 directs the airflow upwards, reducing the airflow velocity in the downcomer 1. As a specific embodiment of the utility model, the lower section of the ascending cylinder 2 can adopt the structural design of the largest cylinder diameter, the gas velocity in the downcomer 1 can be slowed down by increasing the cylinder diameter of the lower section of the ascending cylinder 2, the contact space between the gas and the slag water is enlarged, and the heat exchange washing efficiency of the crude gas can be improved.

Referring to fig. 3 to 4, fig. 3 and 4 are schematic diagrams of phase content of a quench chamber of a gasifier at different gas velocities respectively, and the diameter size of the downcomer 1 influences the gas flow velocity in the downcomer 1, the water-gas heat exchange efficiency, the residence time of gas in the downcomer 1 and the like, and is one of the key parameters of the quench chamber design. After the inner diameter of the downcomer 1 is enlarged, the gas flow speed in the downcomer 1 is reduced, the impact capacity of the crude synthesis gas on the liquid surface of the slag pool is reduced, but on the premise of not changing the inner diameter of the quenching chamber of the gasification furnace, the cross-sectional area of the outer ring of the quenching chamber of the gasification furnace is reduced due to the increase of the inner diameter of the downcomer 1. The gas-slag separation efficiency is influenced, and the gas-slag separation efficiency can be obtained by numerical simulation calculation, when the gas velocity in the downcomer 1 is 2-3m/s, the top of the chilling chamber of the gasification furnace can maintain a stable gas-liquid phase interface, the entrainment of liquid foam is less, and the fly ash content is low and is about 0.019-0.027% Vol. In order to improve the gas-slag separation efficiency of the chilling chamber of the gasification furnace under the condition of not changing the diameter of the downcomer 1, the utility model selects to add the ascending cylinder 2 on the outer side of the downcomer 1.

Because the lower section of the ascending cylinder 2 is larger than the upper section of the ascending cylinder, and the air flow velocity is increased when the air passes through the transition section, so that the transition section of the circular truncated cone structure becomes an area with the most drastic change of the air flow velocity in the ascending cylinder 2, more air bubbles are easily generated in the slag water, and the washing effect of the slag water on the air is reduced, therefore, the bubble breaking device 4 is arranged on the inner wall of the ascending cylinder 2 and/or the outer wall of the descending pipe 1, the bubble breaking device 4 can effectively break the air bubbles, and the air is prevented from carrying impurities when the air goes upwards between the ascending cylinder 2 and the descending pipe 1.

Referring to fig. 1, as a preferred embodiment of the present invention, a fin may be used as the bubble breaking device 4 of the present invention, a plurality of layers of fins are arranged on the inner wall of the ascending cylinder 2 and/or the outer wall of the descending tube 1 to break the bubbles in the slag water and simultaneously separate impurities such as ash and slag carried in the gas, when the gas descends from the descending tube 1 and then flows to the interval between the ascending cylinder 2 and the descending tube 1, the gas enters the slag water at the lower part of the chilling chamber of the gasification furnace and moves upwards, when entering the transition section of the ascending cylinder 2, the gas flow velocity increases to generate violent reaction, thereby generating a large number of bubbles, and a plurality of layers of fins are reasonably arranged on the inner wall of the ascending cylinder 2 and/or the outer wall of the descending tube 1, the gas carries the bubbles and ash and collides with the fins, and the fins break the bubbles and separate the ash and slag from the gas.

It should be noted that, as a preferred embodiment of the quench chamber of the gasification furnace of the present invention, when the fins are provided, the lowest end of the fins provided on the inner wall of the ascending cylinder 2 should be higher than the lower port of the descending tube 1, and preferably, the size can be controlled between 400 mm and 800mm to achieve a better bubble breaking effect.

It should be further noted that the fins may be fixed on the inner wall of the ascending barrel 2 and/or the outer wall of the descending tube in a circular ring shape, or circular arc fins may be used, and the fins are uniformly arranged on the inner wall of the ascending barrel 2 and/or the outer wall of the descending tube 1 in a circular ring shape, and the number of the arranged fins may be reasonably arranged according to the actual situation, so that 2-5 layers are beneficial.

As a preferred embodiment of the present invention, the size of the fins in the above technical solution is preferably made, and preferably, the radial size of the fins is larger than one eighth of the interval between the downcomer 1 and the uprising cylinder 2 and smaller than one quarter of the interval between the downcomer 1 and the uprising cylinder 2. The size design can not only ensure the normal operation of gas, but also effectively remove bubbles, enhance turbulent washing and improve the gas-slag separation efficiency.

In addition, the bubble breaking device 4 in the chilling chamber of the gasification furnace is not limited to fins, but can be other devices, such as long rods with certain strength and uniformly arranged in a circumferential shape, or a filter screen with pores, and the like, as long as the purpose of breaking bubbles and not influencing gas operation is met.

Referring to fig. 1, a baffle plate 3 is further arranged on the outer peripheral surface of a downcomer 1 of the quenching chamber of the gasification furnace, the baffle plate 3 is positioned above the upper port of a rising cylinder 2, and the distance from the edge of the baffle plate 3 to the axis of the downcomer 1 is greater than the diameter of the upper section of the rising cylinder 2. The ascending crude gas carries water and ash, and when the crude gas upwards runs along the interval between the ascending barrel 2 and the descending pipe 1, the crude gas collides with the baffle plate 3 to re-separate the water and the ash carried by the crude gas, so that the slag-water separation efficiency of the chilling chamber of the gasification furnace is improved. Moreover, as a preferred embodiment of the gasifier quench chamber of the present invention, when the baffle plate 3 is provided, the outer edge of the baffle plate is inclined downward, and the included angle between the baffle plate and the axis of the ascending cylinder 2 is preferably 20 to 60 degrees, the inclination is aimed at that when the ascending raw gas collides with the baffle plate 3, the separated water and ash can slide down along the baffle plate 3 to the bottom of the gasifier quench chamber due to the inclination, and secondly, because the baffle plate 3 is arranged around the outer peripheral surface of the descending pipe 1, and the outer diameter of the baffle plate 3 is larger than the upper section diameter of the ascending cylinder 2, the separated water and ash can fall into the gap between the ascending cylinder 2 and the gasifier quench chamber housing along the inclined baffle plate 3, and the influence on the ascending gas after falling into the gap between the descending pipe 1 and the ascending cylinder 2 is avoided.

Preferably, the height of the baffle plate 3 fixed on the downcomer 1 is higher than 400-.

In a preferred embodiment of the present invention, the diameter of the ascending tube 2 is preferably set to 48% to 56% of the diameter of the gasifier quench chamber, the diameter of the ascending tube 2 is preferably set to be larger in the lower section than the ascending tube 2, and the diameter of the ascending tube 2 is preferably set to be smaller than 70% of the diameter of the gasifier quench chamber. Preferably, for a gasification furnace of 2000-3000 ton grade for coal injection per day, the lower port of the ascending cylinder 2 is preferably lower than the lower port of the descending pipe 1 by 800-1500mm, and the upper port of the ascending cylinder 2 is preferably higher than the normal level of the quenching liquid in the quenching chamber by 1400-2000 mm.

Referring to fig. 1, a plurality of connecting pieces 5 are adopted to fix the ascending barrel 2 on the shell of the quenching chamber of the gasification furnace, preferably, the connecting pieces 5 can be steel plates or other supporting plates which can play a supporting role and meet the requirements of the gasification furnace, the number of the connecting pieces 5 is determined according to the actual situation of the quenching chamber of the gasification furnace, 3-6 connecting pieces are preferred, and the probability of ash slag bridging can be prevented by using the connecting pieces 5.

The gasification furnace chilling chamber of the present invention is described above by using the specific embodiment, and it can be understood that the structural body and the size of the gasification furnace chilling chamber of the present invention are not limited to the specific structural form described in the above embodiment, and may be in other structural forms as long as the conditions that the downcomer 1 and the ascending cylinder 2 are matched together, the ascending cylinder 2 includes an upper section, a transition section and a lower section which are connected in sequence from top to bottom, the diameter of the lower section is greater than that of the upper section, and the transition section is in a circular truncated cone structure are satisfied, so that the gasification furnace chilling chamber of the present invention can achieve the purposes of reducing disturbance of gas to the liquid level in the chilling chamber, improving the accuracy and the online period of liquid level meter measurement, increasing turbulent washing, improving separation efficiency, avoiding the problem that crude gas carries water and ash, and having better installation reliability.

As can be seen from the above embodiments, the present invention has the following technical effects:

according to the chilling chamber of the gasification furnace, the ascending cylinder 2 is designed into three sections from top to bottom in a mode that the ascending cylinder 2 is additionally arranged on the outer side of the descending pipe 1, the three sections are respectively an upper section, a transition section and a lower section which are sequentially connected from top to bottom, the diameter of the lower section is larger than that of the upper section, the transition section is in a circular truncated cone structure, meanwhile, an interval exists between the ascending cylinder 2 and the descending pipe 1, the arrangement of the ascending cylinder 2 reduces the airflow flow velocity in the descending pipe 1, the contact space of gas and slag water is also increased, the efficiency of crude gas heat exchange washing is improved, the transition section is in a circular truncated cone structure design, the gas in the ascending cylinder 2 can be gradually accelerated, and the problems that liquid level disturbance is large due to sudden change of gas velocity and the like are solved. The disturbance of gas to the liquid level outside the ascending cylinder is reduced, and the measurement accuracy and the online period of the liquid level meter are improved.

In addition, the bubble breaking device 4 is arranged on the inner wall of the ascending barrel 2 and/or the outer wall of the descending tube 1, and the bubble breaking device 4 preferably adopts fins, so that bubbles generated by reaction of gas and slag water are broken, gas is blocked from carrying slag, the washing effect is enhanced, turbulent washing is increased, and the separation efficiency is improved. The baffle plate 3 is arranged on the outer wall of the descending pipe 1, so that ascending gas collides with the baffle plate 3 to perform gas-slag separation again, and the defects of water carrying and large ash carrying of crude gas are reduced.

The utility model solves the problem of low measurement accuracy of the liquid level meter caused by large disturbance of the liquid level due to overlarge gas flow velocity in the down pipe 1 in the chilling chamber of the gasification furnace, improves the measurement accuracy and the online period of the liquid level meter, increases turbulent washing, improves separation efficiency and avoids the problems of water carrying and large ash carrying of crude gas.

In the description of the present invention, reference to the description of "one embodiment," "some embodiments," "a specific implementation," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In the present disclosure, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, however, the present invention is not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical solution of the present invention within the technical idea of the present invention, and these simple modifications are within the protective scope of the present invention.

It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the utility model. The utility model is not described in detail in order to avoid unnecessary repetition.

In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.

Claims (10)

1. The utility model provides a gasifier chilling chamber, its characterized in that includes downcomer (1), the cover is located downcomer (1) outside and with there is spaced ascending section of thick bamboo (2) between downcomer (1) lateral surface, ascending section of thick bamboo (2) include by last upper segment, changeover portion and the hypomere that connects gradually from top to bottom, the last port of upper segment is higher than slag pool liquid level, the lower port of hypomere is less than the lower port of downcomer (1), its the diameter of hypomere is greater than the diameter of upper segment, the changeover portion is round platform shape structure.

2. A gasifier quench chamber according to claim 1, characterized in that the inner wall of the riser (2) and/or the outer wall of the downcomer (1) is provided with a bubble breaking device (4).

3. The gasifier quench chamber according to claim 2, characterized in that said bubble-breaking means (4) are fins, and the inner wall of said rising drum (2) is provided with a plurality of layers of fins.

4. A gasifier quench chamber according to claim 3 characterized in that the outer wall of said downcomer (1) is provided with multiple layers of fins.

5. A gasifier quench chamber according to claim 3 or 4, characterized in that said fin radial dimension is greater than one eighth of the spacing between said downcomer (1) and said uprising cartridge (2) and less than one quarter of the spacing between said downcomer (1) and said uprising cartridge (2).

6. The quench chamber of the gasifier according to any of the claims 1 to 4, characterized in that a baffle plate (3) is arranged around the outer circumference of the downcomer (1), the baffle plate (3) is located above the upper port of the riser (2), and the outer diameter of the baffle plate (3) is larger than the diameter of the upper section of the riser (2).

7. A quench chamber of a gasifier according to claim 6, characterized in that the outer edge of the baffle plate (3) is arranged obliquely downwards and makes an angle of 20-60 ° with the axis of the rising barrel (2).

8. The gasifier quench chamber according to any of claims 1 to 4, characterized in that the diameter of the upper section of the riser cylinder (2) is 48-56% of the gasifier quench chamber diameter, and the diameter of the lower section of the riser cylinder (2) is less than 70% of the gasifier quench chamber diameter.

9. A gasifier quench chamber according to any of claims 1 to 4 characterized in that the lower edge of the lower section of the riser drum (2) is connected with the gasifier quench chamber shell by a multi-piece connection (5).

10. A gasifier characterized by comprising a gasifier quench chamber according to any of claims 1 to 9.

Images