Low-rank coal oxygen-free upgrading heat exchange furnace

Abstract

The present invention belongs to the technical field of raw coal gas production, and provides a low-rank coal oxygen-free upgrading heat exchange furnace, which can transfer high-temperature heat energy to a raw coal gas carrier in the form of heat exchange, and then supply it to the raw coal in a rotary kiln to continue to generate the same raw coal gas; the adopted technical scheme is: the two sides of the furnace body are respectively provided with a carrier supply chamber and a mixing chamber, the middle part of the furnace body is divided into a plurality of air flow channels, the plurality of air flow channels are further divided into carrier channels and high-temperature combustion channels arranged at intervals, the carrier channel is connected with the carrier supply chamber and the mixing chamber, the high-temperature combustion channels are sealed at both ends, an air supply chamber connected with the plurality of high-temperature combustion channels is provided inside the furnace body, an air supply chamber connected with the plurality of high-temperature combustion channels is provided on the air supply chamber, a high-temperature gas pipeline is provided outside the furnace body and is respectively connected with the plurality of high-temperature combustion channels through a plurality of high-temperature gas supply pipes, a carrier supply pipeline is connected to the carrier supply chamber, and a carrier output fan connected to the carrier delivery pipeline is installed in the mixing chamber.

Description

Technical Field

[0001] The invention discloses a heat exchange furnace for upgrading low-rank coal without oxygen, which belongs to the technical field of raw coal gas production, and specifically relates to a heat exchange furnace used in a system for generating raw coal gas by cracking low-rank coal. Background Art

[0002] The direct combustion of low-rank coal is highly polluting and contains a lot of impurities. In recent years, in response to national environmental protection policies, most production enterprises are no longer allowed to use low-rank coal, so a large amount of low-rank coal resources have accumulated in the market. The clean coal gas used in the combustion of our company's production system needs to be purified from the waste gas. In order to consider the production cost, we are committed to the use and development of low-rank coal to produce waste gas. In the past, the use of low-rank coal to produce waste gas was mostly oxygen-deficient combustion. However, due to the low calorific value and too many impurities of low-rank coal, the produced waste gas can only be burned once, and the internal elements are wasted. Our company has been researching the project of using low-rank coal for calcination for many years. In order to avoid the reduction of product quality due to the high impurities of low-rank coal, a system that uses waste gas carrier in the entire calcination cycle has been developed. The waste gas carrier uses heat exchange technology to obtain heat and supply calcination heat to the rotary kiln. At the same time, since the raw coal in the rotary kiln generates gas with the same composition, it will not affect the quality of the gas product, so that low-rank coal is anaerobic cracked to generate waste gas. The heat exchange between the waste gas carrier and the high-temperature fuel gas is the key to the system. Summary of the invention

[0003] The present invention overcomes the shortcomings of the prior art and aims to solve the following technical problem: to provide a low-rank coal oxygen-free upgrading heat exchange furnace, which can transfer high-temperature heat energy to a raw coal gas carrier in the form of heat exchange, and then supply it to the raw coal in the rotary kiln to continue to generate the same raw coal gas, thereby improving the quality of the generated products and reducing production costs.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is: a low-rank coal oxygen-free upgrading heat exchange furnace, including a furnace body, a carrier supply chamber, a mixing chamber, a partition, a carrier channel, a high-temperature combustion channel, an air supply cavity and a high-temperature gas pipeline, the furnace body is a sealed chamber structure made of refractory bricks, one side of the furnace body is the carrier supply chamber and the other side is the mixing chamber, the middle part of the furnace body is divided into multiple airflow channels by multiple partitions, the multiple airflow channels are divided into carrier channels and high-temperature combustion channels arranged at intervals, the two ends of each carrier channel are respectively connected to the carrier supply chamber and the mixing chamber, each high-temperature combustion channel is sealed at both ends, a layer of air supply cavity is provided on one side of the furnace body, the air supply cavity is provided with an air supply pipe connected to the outside of the furnace body, the air supply cavity is respectively connected to the multiple high-temperature combustion channels through multiple combustion-aiding gas supply pipes, the high-temperature gas pipeline is arranged outside the furnace body and is respectively connected to the multiple high-temperature combustion channels through multiple high-temperature gas supply pipes, the carrier supply chamber is connected to the carrier supply pipeline, a carrier output fan is installed in the mixing chamber, the inlet of the carrier output fan corresponds to the mixing chamber and the carrier conveying pipeline is provided on its outlet

[0005] The width of the carrier channel is smaller than the width of the high-temperature combustion channel.

[0006] The partition is composed of a plurality of identical template blocks assembled together;

[0007] The template block is a square plate-shaped structure. The middle parts of two adjacent sides of the template block are provided with fillets with the same structure and a triangular cross-section, and the middle parts of the other two sides are provided with grooves with the same structure and a triangular cross-section. The fillets and grooves on the opposite sides of the template block match, and two adjacent template blocks on the partition are embedded and connected through corresponding matching fillets and grooves.

[0008] The four edges of both sides of the template block are provided with convex strips.

[0009] Two cross-shaped ridges are arranged on both sides of the template block, and the intersection point is located at the center of the template block.

[0010] The connecting points of the four template blocks on the partition layer form cross-shaped embedded blocks through four convex strips, and the embedded blocks on the opposite surfaces of the two oppositely arranged partition layers correspond to each other, and a plurality of support rods are connected between the two oppositely arranged partition layers, and the two ends of the support rods are provided with embedded grooves matching the embedded blocks, and the two ends of the support rods are fixedly connected to the two partition layers through the matching embedding of the embedded blocks and the embedded grooves.

[0011] Compared with the prior art, the present invention has the following beneficial effects: by setting up a heat exchange furnace, the heat of the high-temperature combustion gas is transferred to the raw coal gas carrier in a heat conduction manner, and the raw coal gas carrier circulates between the heat exchange furnace and the rotary kiln in a closed environment. When low-rank coal is cracked in the rotary kiln to generate raw coal gas, it will not be mixed with air impurities, thereby avoiding the influence of various impurities on the raw coal gas product, improving the production quality, greatly saving the production cost of the enterprise, saving a large amount of non-renewable energy consumption, and consuming low-rank coal on the market to form corporate benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The present invention will be further described in detail below in conjunction with the accompanying drawings;

[0013] Figure 1 It is a structural schematic diagram of the present invention;

[0014] Figure 2 It is a schematic diagram of the structure of a partition assembled from four template blocks in the present invention;

[0015] Figure 3 It is a schematic diagram of the splicing cross section of the template blocks in the present invention;

[0016] Figure 4 for Figure 3 A magnified schematic diagram of part A;

[0017] Figure 5 It is a structural schematic diagram of the template block in the present invention;

[0018] Figure 6 It is a structural schematic diagram of the support rod in the present invention;

[0019] Figure 7 It is a schematic diagram of the side structure of the end of the support rod in the present invention. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below in combination with the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all the embodiments; based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0021] like Figure 1As shown, the low-rank coal oxygen-free upgrading heat exchange furnace of the present invention comprises a furnace body 1, a carrier supply chamber 2, a mixing chamber 3, a partition 4, a carrier channel 5, a high-temperature combustion channel 6, an air supply cavity 7 and a high-temperature gas pipeline 8. The furnace body 1 is a sealed chamber structure made of refractory bricks, one side of the furnace body 1 is the carrier supply chamber 2 and the other side is the mixing chamber 3. The middle part of the furnace body 1 is divided into a plurality of air flow channels by a plurality of partitions 4. The plurality of air flow channels are further divided into carrier channels 5 and high-temperature combustion channels 6 arranged at intervals. The two ends of each carrier channel 5 are respectively connected to the carrier supply chamber 2 and the mixing chamber 3. Each high-temperature combustion channel 6 is connected to the carrier supply chamber 2 and the mixing chamber 3. The channels 6 are sealed at both ends, an air supply chamber 7 is provided on one side of the interior of the furnace body 1, and an air supply pipe 9 connected to the outside of the furnace body is provided on the air supply chamber 7, the air supply chamber 7 is connected to the multiple high-temperature combustion channels 6 through multiple combustion-supporting gas supply pipes 10, the high-temperature gas pipeline 8 is arranged outside the furnace body 1 and is connected to the multiple high-temperature combustion channels 6 through multiple high-temperature gas supply pipes 11, a carrier supply pipeline 12 is connected to the carrier supply chamber 2, and a carrier output fan 13 is installed in the mixing chamber 3, the inlet of the carrier output fan 13 corresponds to the mixing chamber 3 and a carrier conveying pipeline is provided on its outlet.

[0022] The width of the carrier channel 5 is smaller than the width of the high-temperature combustion channel 6 .

[0023] Working process: In the production system, high-temperature fuel gas enters the high-temperature combustion channel 6 of the heat exchange furnace 1 through the high-temperature fuel gas pipeline 8, and the air supply pipe 9 continuously supplies air to the air supply chamber 7, and the air supply chamber 7 then supplies air to the high-temperature combustion channel 6 through the auxiliary fuel gas supply pipe 10. After the high-temperature fuel gas is mixed with the air, the oxygen in the air assists combustion and burns to generate a large amount of heat energy. The raw gas generated by the cracking of the rotary kiln in the raw gas generation system provides the raw gas as a carrier to the supply chamber 2 through the carrier supply pipeline 12. The raw gas enters multiple carrier channels 5 under the push of the gas pressure of the rotary kiln and the suction of the carrier output fan 13. The raw gas in the carrier channel 5 absorbs the heat energy of the high-temperature fuel gas in the high-temperature combustion channel 6 through heat exchange, becoming a high-temperature raw gas carrier, and is sent to the rotary kiln through the carrier output fan 13 and the carrier delivery pipeline, and the raw coal inside is cracked to continue to generate raw gas with the same composition. Most of the generated raw gas is supplied to other systems as a finished product, and a small part re-enters the carrier supply chamber 2 and the carrier channel 15 for heat exchange with the high-temperature fuel gas, forming a heat circulation transmission of the carrier.

[0024] The high-temperature combustion gas in the high-temperature combustion pipeline 8 of the present invention can be produced by the combustion of clean gas formed by purifying the raw gas generated by the production system itself, and can form a circulating self-sufficient system with the raw gas production system of the present invention.

[0025] like Figure 2-6 As shown, the partition 4 is composed of a plurality of identical template blocks 41 assembled together;

[0026] The template block 41 is a square plate-shaped structure. The middle of two adjacent sides of the template block 41 is provided with a fillet 42 with the same structure and a triangular cross-section, and the middle of the other two sides is provided with a groove 43 with the same structure and a triangular cross-section. The fillet 42 and the groove 43 on the opposite sides of the template block 41 match each other, and the two adjacent template blocks 41 on the partition layer 4 are embedded and connected through the corresponding matching fillet 42 and groove 43.

[0027] The four edges of both sides of the template block 41 are provided with convex strips 44 .

[0028] Two cross-shaped ridges 45 are disposed on both sides of the template block 41 , and the intersection point is located at the center of the template block 41 .

[0029] The connecting points of the four template blocks 41 on the partition 4 form a cross-shaped embedded block 46 through four convex strips 44, and the embedded blocks 46 on the opposite surfaces of the two oppositely arranged partitions 4 correspond to each other, and a plurality of support rods 47 are connected between the two oppositely arranged partitions 4, and the two ends of the support rods 47 are provided with embedded grooves 48 matching the embedded blocks 46, and the two ends of the support rods 47 are fixedly connected to the two partitions 4 through the matching embedding of the embedded blocks 46 and the embedded grooves 48.

[0030] A plurality of template blocks 41 are combined with matching fillets 42 and grooves 43 to form a whole partition 4, which is arranged in a heat exchange furnace, and has a simple structure, is quick and convenient to assemble, and is low in cost. The convex strips 44 on the edge of the template block 41 can be used as reinforcing ribs to make the entire partition 4 more impact-resistant, and because the convex strips 44 widen the side width of the template block 41, the fit of the fillets 42 and the grooves 43 can be more stable, avoiding the gas on both sides of the partition board from absorbing heat and expanding or releasing heat and contracting, which may cause the partition board to rupture. On the one hand, the support rod 47 can limit the distance between the two relative partition boards, and on the other hand, it can lock the joints of the four template blocks 41 through the insert block 46 and the insert groove 48, further strengthening the stability of the modular partition 4.

[0031] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. Low-rank coal oxygen-free upgrading heat exchange furnace, characterized by: The invention comprises a furnace body (1), a carrier supply chamber (2), a mixing chamber (3), a partition (4), a carrier channel (5), a high-temperature combustion channel (6), an air supply cavity (7) and a high-temperature gas pipeline (8), wherein the furnace body (1) is a sealed chamber structure made of refractory bricks, one side of the furnace body (1) is the carrier supply chamber (2) and the other side is the mixing chamber (3), the middle part of the furnace body (1) is divided into a plurality of air flow channels by a plurality of partitions (4), and the plurality of air flow channels are further divided into carrier channels (5) and high-temperature combustion channels (6) arranged at intervals, the two ends of each carrier channel (5) are respectively connected to the carrier supply chamber (2) and the mixing chamber (3), and the two ends of each high-temperature combustion channel (6) are sealed. The furnace body (1) is sealed, an air supply chamber (7) is provided on one side of the interior of the furnace body, an air supply pipe (9) connected to the exterior of the furnace body is provided on the air supply chamber (7), the air supply chamber (7) is connected to the plurality of high-temperature combustion channels (6) through a plurality of combustion-aiding gas supply pipes (10), a high-temperature gas pipeline (8) is provided outside the furnace body (1) and is connected to the plurality of high-temperature combustion channels (6) through a plurality of high-temperature gas supply pipes (11), a carrier supply pipeline (12) is connected to the carrier supply chamber (2), a carrier output fan (13) is installed in the mixing chamber (3), an inlet of the carrier output fan (13) corresponds to the mixing chamber (3), and a carrier delivery pipeline is provided on its outlet; The partition layer (4) is composed of a plurality of identical template blocks (41) assembled together; The template block (41) is a square plate-shaped structure. The middle parts of two adjacent sides of the template block (41) are provided with fillets (42) with the same structure and a triangular cross-section, and the middle parts of the other two sides are provided with grooves (43) with the same structure and a triangular cross-section. The fillets (42) and grooves (43) on the two opposite sides of the template block (41) match each other. Two adjacent template blocks (41) on the partition layer (4) are connected by embedding through the corresponding matching fillets (42) and grooves (43).

2. The low-rank coal oxygen-free upgrading heat exchange furnace according to claim 1, characterized in that: The width of the carrier channel (5) is smaller than the width of the high-temperature combustion channel (6).

3. The low-rank coal oxygen-free upgrading heat exchange furnace according to claim 1 or 2, characterized in that: The four edges of both sides of the template block (41) are provided with convex strips (44).

4. The low-rank coal oxygen-free upgrading heat exchange furnace according to claim 3, characterized in that: Two cross-shaped ridges (45) are provided on both sides of the template block (41), and the intersection point is located at the center of the template block (41).

5. The low-rank coal oxygen-free upgrading heat exchange furnace according to claim 4, characterized in that: The connecting points of the four template blocks (41) on the partition (4) form a cross-shaped embedded block (46) through four convex strips (44), and the embedded blocks (46) on the opposite surfaces of the two oppositely arranged partitions (4) are matched with each other, and a plurality of support rods (47) are connected between the two oppositely arranged partitions (4), and the two ends of the support rods (47) are provided with embedded grooves (48) matching with the embedded blocks (46), and the two ends of the support rods (47) are fixedly connected with the two partitions (4) through the matching embedding of the embedded blocks (46) and the embedded grooves (48).

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