Automatic circulation heating device for digestion hot water

Abstract

The utility model relates to an automatic circulation heating device for digested hot water. Comprising an ash melting assembly and a heat exchange assembly which are both arranged on a supporting frame, the ash melting assembly comprises two sets of ash melting barrels which are vertically arranged and distributed in parallel, a water exchange pipe is formed by communicating a set of transverse pipes and two sets of vertical pipes, and the left end and the right end of each transverse pipe communicate with the upper ends of the two sets of ash melting barrels correspondingly; the discharge pipe is respectively communicated with the lower ends of the two groups of ash melting barrels; the heat exchange assembly comprises a water inlet pipe which is of an inverted-Y-shaped structure, the lower end branch portion of the water inlet pipe communicates with the two heat exchange boxes, the heat exchange boxes cover the outer side wall of the ash melting barrel, and the vertical pipe penetrates through the heat exchange boxes from top to bottom. According to the utility model, the heat exchange box is coated on the outer side walls of the two groups of ash melting barrels, calcium oxide reacts with hot water in the ash melting barrels to generate heat and then exchanges the heat into water in the heat exchange box, the heated water is pressed into the other group of ash melting barrels to carry out the next group of reaction, and the generated hot water is pressed into the previous group of ash melting barrels again to carry out the reaction; and the effect of cyclic heating production is achieved.

Description

Technical Field

[0001] The utility model belongs to the field of calcium carbonate production equipment, and in particular relates to an automatic circulation heating device for digestion hot water. Background Art

[0002] In the current production of calcium carbonate, the surface treatment of calcium carbonate will be better through wet treatment. The production steps are to react calcium oxide with hot water in a ash machine to generate raw slurry. After releasing a large amount of heat during the reaction, calcium hydroxide can be generated and activation treatment can be carried out at the same time. However, if the heat is dissipated directly in the air, it will cause a huge waste of energy. Moreover, after completing a single production, the ash machine will be in a high-temperature state. In order to be able to produce the next time, the stability of the production process is very important. If the ash machine is in a high-temperature state and hot water is added, the hot water will be too high due to heat conduction, making the state of each production process inconsistent, and causing slight differences in each production. Therefore, before the next production, the ash machine needs to be cooled down and then injected with hot water at a constant temperature to proceed to the next production. Utility Model Content

[0003] In order to solve the above technical problems, the utility model provides an automatic circulation heating device for digestion hot water, which is provided with two groups of ash-removing cylinders and a heat exchange box is coated on the outer wall of the ash-removing cylinder. Heat is generated by the reaction of calcium oxide and hot water in the ash-removing cylinder, and the generated heat is exchanged into the water in the heat exchange box. The heated water is pressed into the other group of ash-removing cylinders for the next group of reactions through the water inlet pipe. After the heat exchange is completed, the hot water is pressed back into the previous group of ash-removing cylinders for reaction, thereby achieving the effect of circulation heating production.

[0004] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0005] A digestion hot water automatic circulation heating device comprises a support frame, an ash-forming component and a heat exchange component, wherein the ash-forming component and the heat exchange component are both arranged on the support frame, the ash-forming component comprises a water exchange pipe, a first ash-forming cylinder, a second ash-forming cylinder and a discharge pipe, wherein the first ash-forming cylinder and the second ash-forming cylinder are arranged vertically and arranged in parallel, and the first ash-forming cylinder and the second ash-forming cylinder are both provided with a feeding port, the water exchange pipe is formed by a group of horizontal pipes, a first vertical pipe and a second vertical pipe being interconnected to form a U-shaped structure, and the left and right ends of the horizontal pipe are respectively connected to the upper ends of the first ash-forming cylinder and the second ash-forming cylinder ; The discharge pipe is in a Y-shaped structure, and the upper end bifurcation of the discharge pipe is connected to the lower ends of the first ash-burning cylinder and the second ash-burning cylinder respectively; the heat exchange assembly includes an inlet pipe, a first heat exchange box and a second heat exchange box, the water inlet pipe is in an inverted Y-shaped structure, and the lower end bifurcation of the water inlet pipe is connected to the first heat exchange box and the second heat exchange box respectively, the first heat exchange box is coated on the outer wall of the first ash-burning cylinder, and the second heat exchange box is coated on the outer wall of the second ash-burning cylinder, the first vertical pipe penetrates the first heat exchange box from top to bottom, and the second vertical pipe penetrates the second heat exchange box from top to bottom.

[0006] The horizontal pipe is provided with a first valve and a second valve, and the horizontal pipe is connected with the first ash-burning cylinder, the first valve, the first vertical pipe, the second vertical pipe, the second valve and the second ash-burning cylinder from left to right respectively; the discharge pipe is provided with a third valve and a fourth valve, and the third valve is arranged at the lower end of the first ash-burning cylinder, and the fourth valve is arranged at the lower end of the second ash-burning cylinder; the water inlet pipe is provided with a fifth valve and a sixth valve, and the fifth valve is arranged on the forked portion at the lower end of the water inlet pipe connected with the first heat exchange box, and the sixth valve is arranged on the forked portion at the lower end of the water inlet pipe connected with the second heat exchange box.

[0007] The lower end horizontal plane of the first vertical pipe is lower than the horizontal plane where the water inlet pipe is connected to the first heat exchange box, and the lower end horizontal plane of the second vertical pipe is lower than the horizontal plane where the water inlet pipe is connected to the second heat exchange box.

[0008] The automatic circulation heating device for digestion hot water adopting this structure is provided with two sets of parallel first ash-removing cylinders and second ash-removing cylinders for calcium oxide and hot water. In order to be able to put calcium oxide in the first ash-removing cylinder and the second ash-removing cylinder, the first ash-removing cylinder and the second ash-removing cylinder are provided with feeding ports for throwing raw materials, and the hot water used for the reaction can be used with the hot water generated by the heat exchange in the first heat exchange box and the second heat exchange box. Therefore, the first heat exchange box and the second heat exchange box are respectively coated on the outer walls of the first ash-removing cylinder and the second ash-removing cylinder, and the upper ends of the first heat exchange box and the second heat exchange box are respectively connected to the water inlet pipe of Y-shaped structure, and the inner cavity of the first heat exchange box and the second heat exchange box is supplied with water through the water inlet pipe, and the supplied water is soaked in the outer walls of the first ash-removing cylinder and the second ash-removing cylinder for heat exchange, and the water to complete the heat exchange needs to be supplied The water in the first heat exchange box is supplied to the second ash-burning cylinder, and the water in the second heat exchange box is supplied to the first ash-burning cylinder. Therefore, a U-shaped water exchange pipe is set, which is composed of a group of horizontal pipes, a first vertical pipe and a second vertical pipe that are interconnected. The left and right ends of the horizontal pipe are respectively connected to the upper ends of the first ash-burning cylinder and the second ash-burning cylinder, and the first vertical pipe and the second vertical pipe penetrate the first heat exchange box and the second heat exchange box from top to bottom respectively, and the lower end horizontal plane of the first vertical pipe is lower than the horizontal plane where the water inlet pipe is connected to the first heat exchange box, and the lower end horizontal plane of the second vertical pipe is lower than the horizontal plane where the water inlet pipe is connected to the second heat exchange box. Therefore, when the water inlet pipe supplies water to the inner cavity of the first heat exchange box and the second heat exchange box, the hot water at the bottom will be pressed into the first vertical pipe and the second vertical pipe, so the hot water will enter the horizontal pipe.

[0009] In order to realize that the water heated by the first heat exchange box is pressed into the second ash-forming cylinder for reaction, the heat generated after the reaction is heat-exchanged to the second heat exchange box, and the hot water is pressed into the first ash-forming cylinder for reaction after heat exchange to realize the effect of circulating heating production, it is necessary to first be able to control the water supply from the water inlet pipe to enter the first heat exchange box and the second heat exchange box respectively. Therefore, the fifth valve and the sixth valve are set on the water inlet pipe. Opening the fifth valve can supply cold water to the first heat exchange box, and opening the sixth valve can supply cold water to the second heat exchange box. Therefore, the fifth valve and the sixth valve can be opened respectively to make the first heat exchange box The hot water in the first vertical pipe and the second vertical pipe is pumped into the horizontal pipe. In order to enable the hot water in the first heat exchange box to flow into the second ash cylinder and the hot water in the second heat exchange box to flow into the first ash cylinder, a first valve and a second valve are arranged on the horizontal pipe. The first ash cylinder, the first valve, the first vertical pipe, the second vertical pipe, the second valve and the second ash cylinder are connected from left to right on the horizontal pipe respectively. Therefore, when the first valve and the second valve are closed at the same time, the water in the first heat exchange box and the second heat exchange box is in a relatively balanced state. When the first heat exchange box completes heat exchange, the fifth valve and the second valve are opened, and the water inlet pipe is the water pumped into the first heat exchange box. Cold water, the original hot water in the first heat exchange box is pressed into the first vertical pipe, the hot water rises into the horizontal pipe and crosses the second vertical pipe, and enters the second ash cylinder after passing through the second valve, so as to supply hot water to the second ash cylinder. The cold water replaces the hot water in the first heat exchange box for standby. The fifth valve and the second valve are closed, and the first vertical pipe will be filled with water. At this time, the reaction takes place in the second ash cylinder, and the heat generated is transferred to the water in the second heat exchange box. After the reaction and heat exchange are completed, the sixth valve and the first valve are opened. After the second heat exchange box is supplied with cold water, the original hot water in the second heat exchange box will be pressed into the second vertical pipe. The hot water rises inside the horizontal pipe and passes over the first vertical pipe. Since the first vertical pipe is originally filled with water, a small amount of water in the first vertical pipe will be mixed with the hot water after flowing through the first vertical pipe, but this does not affect the overall temperature of the hot water. The hot water passes through the first valve and enters the first ash-destroying cylinder to supply hot water to the first ash-destroying cylinder, thereby realizing the automatic circulation of digestion hot water, heating the water supply and repeatedly utilizing it for reaction. In order to be able to separately export the products after the reaction, the third valve and the fourth valve are respectively arranged on the discharge pipe, so as to separately export the products in the first ash-destroying cylinder and the second ash-destroying cylinder.

[0010] Furthermore, a plurality of flat partitions are provided in the first heat exchange box / the second heat exchange box, and the plurality of flat partitions divide the inner cavity of the first heat exchange box / the second heat exchange box into an S-shaped cavity structure.

[0011] Compared with the prior art, the utility model has the following advantages: by controlling the fifth valve and the sixth valve, cold water can be supplied to the first heat exchange box and the second heat exchange box respectively; when the fifth valve is opened, the second valve is also opened, and the hot water in the first heat exchange box is pressed into the second ash-forming cylinder for reaction; when the sixth valve is opened, the first valve is also opened, and the hot water in the second heat exchange box is pressed into the first ash-forming cylinder for reaction; thereby, the heat generated in the reaction process is exchanged into the water to become the raw material for the next group of reactions, and the use of reciprocating digestion hot water is realized. The device can maximize the use of excess heat to generate the required hot water, and realize recycling, thereby achieving the effect of cyclic heating production. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0013] Figure 1 It is a three-dimensional diagram of the utility model;

[0014] Figure 2 It is a top view of the utility model;

[0015] Figure 3 For the utility model Figure 2 AA section view.

[0016] Among them: 1. Support frame; 2. Ashing assembly; 21. Water exchange pipe; 211. Horizontal pipe; 212. First vertical pipe; 213. Second vertical pipe; 214. First valve; 215. Second valve; 22. First ashing cylinder; 23. Second ashing cylinder; 24. Discharging pipe; 241. Third valve; 242. Fourth valve; 25. Feeding port; 3. Heat exchange assembly; 31. Water inlet pipe; 311. Fifth valve; 312. Sixth valve; 32. First heat exchange box; 33. Second heat exchange box; 34. Horizontal partition. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution of the utility model will be described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work belong to the scope of protection of the utility model.

[0018] The specific implementation of the utility model will be described below in conjunction with the accompanying drawings:

[0019] like Figure 1-3 As shown, a digestion hot water automatic circulation heating device includes a support frame 1, an ash-dissolving component 2 and a heat exchange component 3, wherein the ash-dissolving component 2 and the heat exchange component 3 are both arranged on the support frame 1, the ash-dissolving component 2 includes a water exchange pipe 21, a first ash-dissolving cylinder 22, a second ash-dissolving cylinder 23 and a discharge pipe 24, the first ash-dissolving cylinder 22 and the second ash-dissolving cylinder 23 are vertically arranged and distributed in parallel, and the first ash-dissolving cylinder 22 and the second ash-dissolving cylinder 23 are both provided with a feeding port 25, the water exchange pipe 21 is formed by a group of horizontal pipes 211, a first vertical pipe 212 and a second vertical pipe 213 connected to each other to form a U-shaped structure, and the left and right ends of the horizontal pipe 211 are respectively connected to the first ash-dissolving cylinder 22 and the second ash-dissolving cylinder 23 Upper end; the discharge pipe 24 is in a Y-shaped structure, and the upper end bifurcation of the discharge pipe 24 is connected to the lower ends of the first ash-burning cylinder 22 and the second ash-burning cylinder 23 respectively; the heat exchange component 3 includes an inlet pipe 31, a first heat exchange box 32 and a second heat exchange box 33, the inlet pipe 31 is in an inverted Y-shaped structure, and the lower end bifurcation of the inlet pipe 31 is connected to the first heat exchange box 32 and the second heat exchange box 33 respectively, the first heat exchange box 32 is coated on the outer wall of the first ash-burning cylinder 22, and the second heat exchange box 33 is coated on the outer wall of the second ash-burning cylinder 23, the first vertical pipe 212 penetrates the first heat exchange box 32 from top to bottom, and the second vertical pipe 213 penetrates the second heat exchange box 33 from top to bottom.

[0020] The transverse pipe 211 is provided with a first valve 214 and a second valve 215, and the transverse pipe 211 is connected to the first ash-burning cylinder 22, the first valve 214, the first vertical pipe 212, the second vertical pipe 213, the second valve 215 and the second ash-burning cylinder 23 from left to right respectively; the discharge pipe 24 is provided with a third valve 241 and a fourth valve 242, the third valve 241 is arranged at the lower end of the first ash-burning cylinder 22, and the fourth valve 242 is arranged at the lower end of the second ash-burning cylinder 23; the water inlet pipe 31 is provided with a fifth valve 311 and a sixth valve 312, the fifth valve 311 is arranged on the forked portion at the lower end of the water inlet pipe 31 connected to the first heat exchange box 32, and the sixth valve 312 is arranged on the forked portion at the lower end of the water inlet pipe 31 connected to the second heat exchange box 33.

[0021] The lower end horizontal plane of the first vertical pipe 212 is lower than the horizontal plane where the water inlet pipe 31 is connected to the first heat exchange box 32 , and the lower end horizontal plane of the second vertical pipe 213 is lower than the horizontal plane where the water inlet pipe 31 is connected to the second heat exchange box 33 .

[0022] Furthermore, a plurality of flat partitions 34 are provided in the first heat exchange box 32 / the second heat exchange box 33 , and the plurality of flat partitions 34 divide the inner cavity of the first heat exchange box 32 / the second heat exchange box 33 into an S-shaped cavity structure.

[0023] Description of the working method of this utility model:

[0024] The automatic circulation heating device for digestion hot water adopting this structure is provided with two sets of parallel first ash-removing cylinders 22 and second ash-removing cylinders 23 for calcium oxide and hot water. In order to be able to put calcium oxide in the first ash-removing cylinders 22 and the second ash-removing cylinders 23, the first ash-removing cylinders 22 and the second ash-removing cylinders 23 are provided with feeding ports 25 for throwing raw materials, and the hot water used for the reaction can be used by the hot water generated by the heat exchange in the first heat exchange box 32 and the second heat exchange box 33. Therefore, the first heat exchange box 32 and the second heat exchange box 33 are respectively coated on the outer side walls of the first ash-removing cylinder 22 and the second ash-removing cylinder 23, and the upper ends of the first heat exchange box 32 and the second heat exchange box 33 are respectively connected to the water inlet pipe 31 of the Y-shaped structure, and the inner cavity of the first heat exchange box 32 and the second heat exchange box 33 is supplied with water through the water inlet pipe 31. The supplied water is soaked in the outer side walls of the first ash-removing cylinder 22 and the second ash-removing cylinder 23 for heat exchange, and the water that has completed the heat exchange needs to be supplied to the first ash-removing cylinder 22 and the second ash-removing cylinder 23, the water in the first heat exchange box 32 is supplied to the second ash incineration cylinder 23, and the water in the second heat exchange box 33 is supplied to the first ash incineration cylinder 22, so a U-shaped water exchange pipe 21 is set, and the water exchange pipe 21 is formed by a group of horizontal pipes 211, a first vertical pipe 212 and a second vertical pipe 213 that are interconnected. The left and right ends of the horizontal pipe 211 are respectively connected to the upper ends of the first ash incineration cylinder 22 and the second ash incineration cylinder 23, and the first vertical pipe 212 and the second vertical pipe 213 respectively penetrate the first heat exchange box 32 from top to bottom. Box 32 and the second heat exchange box 33, and the lower end horizontal plane of the first vertical pipe 212 is lower than the horizontal plane where the water inlet pipe 31 is connected to the first heat exchange box 32, and the lower end horizontal plane of the second vertical pipe 213 is lower than the horizontal plane where the water inlet pipe 31 is connected to the second heat exchange box 33. Therefore, when the water inlet pipe 31 supplies water to the inner cavity of the first heat exchange box 32 and the second heat exchange box 33, the hot water at the bottom will be pressed into the first vertical pipe 212 and the second vertical pipe 213, so the hot water will enter the horizontal pipe 211.

[0025] In order to realize that the water heated by the first heat exchange box 32 is pressed into the second ash-forming cylinder 23 for reaction, the heat generated after the reaction is heat-exchanged to the second heat exchange box 33, and the hot water is pressed into the first ash-forming cylinder 22 for reaction after the heat exchange, so as to realize the effect of circulating heating production. Therefore, it is necessary to first control the water supply from the water inlet pipe 31 to enter the first heat exchange box 32 and the second heat exchange box 33 respectively. Therefore, the fifth valve 311 and the sixth valve 312 are set on the water inlet pipe 31. Opening the fifth valve 311 can supply cold water to the first heat exchange box 32, and opening the sixth valve 312 can supply cold water to the second heat exchange box 33. Therefore, by opening the fifth valve 311 and the sixth valve 312 respectively, the first vertical pipe 212 and the sixth vertical pipe 212 can be connected. The hot water in the second vertical pipe 213 is pumped into the horizontal pipe 211. In order to enable the hot water in the first heat exchange box 32 to flow into the second ash barrel 23, and the hot water in the second heat exchange box 33 to flow into the first ash barrel 22, a first valve 214 and a second valve 215 are set on the horizontal pipe 211. The first ash barrel 22, the first valve 214, the first vertical pipe 212, the second vertical pipe 213, the second valve 215 and the second ash barrel 23 are connected from left to right on the horizontal pipe 211. Therefore, when the first valve 214 and the second valve 215 are closed at the same time, the water in the first heat exchange box 32 and the second heat exchange box 33 is in a relatively balanced state. When the first heat exchange box 32 completes the heat exchange, the fifth valve 311 and the second valve 215 are opened, and the water inlet pipe 31 is cold water pumped into the first heat exchange box 32, and the hot water originally in the first heat exchange box 32 is pressed into the first vertical pipe 212, and the hot water rises into the horizontal pipe 211 and passes through the second vertical pipe 213, and enters the second ash-making cylinder 23 after passing through the second valve 215, so as to supply hot water to the second ash-making cylinder 23, and the cold water replaces the hot water in the first heat exchange box 32 for standby use, and the fifth valve 311 and the second valve 215 are closed, and the first vertical pipe 212 will be filled with water, and at this time, a reaction will take place in the second ash-making cylinder 23, and the heat generated will be transferred to the water in the second heat exchange box 33. After the reaction and heat exchange are completed, the sixth valve 312 and the first valve 214 are opened, and after cold water is supplied to the second heat exchange box 33, the original The hot water is pressed into the second vertical pipe 213, and the hot water rises into the horizontal pipe 211 and passes over the first vertical pipe 212. Since the first vertical pipe 212 is originally filled with water, a small amount of water in the first vertical pipe 212 will be mixed with the hot water after flowing through the first vertical pipe 212, but it does not affect the overall hot water temperature. The hot water passes through the first valve 214 and enters the first ash-destroying cylinder 22 to supply hot water to the first ash-destroying cylinder 22, thereby realizing the automatic circulation of hot water for digestion, heating the water supply and repeatedly using it for reaction. In order to be able to separately export the products after the reaction, a third valve 241 and a fourth valve 242 are respectively set on the discharge pipe 24, so that the products in the first ash-destroying cylinder 22 and the second ash-destroying cylinder 23 can be separately exported.

[0026] If the first heat exchange box 32 and the second heat exchange box 33 only have the lower end level of the first vertical pipe 212 lower than the level at which the water inlet pipe 31 is connected to the first heat exchange box 32, and the lower end level of the second vertical pipe 213 lower than the level at which the water inlet pipe 31 is connected to the second heat exchange box 33, it is impossible to ensure that the cold water supplied in the water inlet pipe 31 can completely pump out the hot water originally in the first heat exchange box 32 / the second heat exchange box 33. Since the cold water will sink and the hot water will rise, the pumped cold water is likely to directly reach the bottom of the first heat exchange box 32 / the second heat exchange box 33, resulting in the water pumped out from the first vertical pipe 212 / the second vertical pipe 213 is not hot water. Therefore, a plurality of horizontal partitions are provided in the first heat exchange box 32 / the second heat exchange box 33. Plate 34, a plurality of horizontal partitions 34 divide the inner cavity of the first heat exchange box 32 / the second heat exchange box 33 into an S-shaped cavity structure, so the cold water supplied from the water inlet pipe 31 is hindered by the S-shaped cavity structure and cannot sink to the bottom quickly, and the lower end horizontal plane of the first vertical pipe 212 / the second vertical pipe 213 is located at the bottom of the first heat exchange box 32 / the second heat exchange box 33, so the supplied cold water can only completely fill the internal space of the first heat exchange box 32 / the second heat exchange box 33 after the hot water filled therein is pumped out to the first vertical pipe 212 / the second vertical pipe 213. If necessary, the horizontal partitions 34 can be made of metal, which can not only separate the first heat exchange box 32 / the second heat exchange box 33 internally, but also improve the efficiency of heat exchange.

[0027] The beneficial effect of the utility model is that by controlling the fifth valve 311 and the sixth valve 312, cold water can be supplied to the first heat exchange box 32 and the second heat exchange box 33 respectively. When the fifth valve 311 is opened, the second valve 215 is also opened, and the hot water in the first heat exchange box 32 is pressed into the second ash barrel 23 for reaction. When the sixth valve 312 is opened, the first valve 214 is also opened, and the hot water in the second heat exchange box 33 is pressed into the first ash barrel 22 for reaction. In this way, the heat generated in the reaction process is exchanged into the water to become the raw material for the next group of reactions, and the use of reciprocating digestion hot water is realized. The device can maximize the use of excess heat to generate the required hot water, and realize recycling, thereby achieving the effect of cyclic heating production.

[0028] The above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model is described in detail with reference to the above embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the above embodiments, or replace some or all of the technical features therein with equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the utility model.

Claims

1. A digestion hot water automatic circulation heating device, characterized in that: The invention comprises a supporting frame, an ash-forming component and a heat exchange component, wherein the ash-forming component and the heat exchange component are both arranged on the supporting frame, the ash-forming component comprises a water exchange pipe, a first ash-forming cylinder, a second ash-forming cylinder and a discharge pipe, wherein the first ash-forming cylinder and the second ash-forming cylinder are arranged vertically and arranged in parallel, and a feeding port is arranged on the first ash-forming cylinder and the second ash-forming cylinder, and the water exchange pipe is formed by a group of horizontal pipes, a first vertical pipe and a second vertical pipe being interconnected to form a U-shaped structure, and the left and right ends of the horizontal pipe are respectively connected to the upper ends of the first ash-forming cylinder and the second ash-forming cylinder; the discharge pipe is Y-shaped. The heat exchange assembly comprises a water inlet pipe, a first heat exchange box and a second heat exchange box, the water inlet pipe is in an inverted Y-shaped structure, the lower end of the water inlet pipe is in communication with the first heat exchange box and the second heat exchange box, the first heat exchange box is coated on the outer wall of the first ash-burning cylinder, the second heat exchange box is coated on the outer wall of the second ash-burning cylinder, the first vertical pipe penetrates the first heat exchange box from top to bottom, and the second vertical pipe penetrates the second heat exchange box from top to bottom.

2. The automatic circulation heating device for hot water for digestion according to claim 1, characterized in that: The horizontal pipe is provided with a first valve and a second valve, and the horizontal pipe is connected with the first ash-burning cylinder, the first valve, the first vertical pipe, the second vertical pipe, the second valve and the second ash-burning cylinder from left to right respectively.

3. The automatic circulation heating device for hot water for digestion according to claim 2 is characterized in that: The discharge pipe is provided with a third valve and a fourth valve, the third valve is arranged at the lower end of the first ash-dissolving cylinder, and the fourth valve is arranged at the lower end of the second ash-dissolving cylinder.

4. The automatic circulation heating device for hot water for digestion according to claim 3 is characterized in that: The water inlet pipe is provided with a fifth valve and a sixth valve. The fifth valve is arranged on the forked portion at the lower end of the water inlet pipe connected to the first heat exchange box, and the sixth valve is arranged on the forked portion at the lower end of the water inlet pipe connected to the second heat exchange box.

5. The automatic circulation heating device for hot water for digestion according to claim 4 is characterized in that: The lower end horizontal plane of the first vertical pipe is lower than the horizontal plane where the water inlet pipe is connected to the first heat exchange box, and the lower end horizontal plane of the second vertical pipe is lower than the horizontal plane where the water inlet pipe is connected to the second heat exchange box.

6. The automatic circulation heating device for hot water for digestion according to claim 5, characterized in that: A plurality of flat partitions are provided in the first heat exchange box / the second heat exchange box, and the plurality of flat partitions divide the inner cavity of the first heat exchange box / the second heat exchange box into an S-shaped cavity structure.

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