Straw combustion boiler and straw combustion heating system

Abstract

The utility model relates to a straw combustion boiler and a straw combustion heating system. The boiler comprises a combustion chamber and an ash pool, a water fire grate is fixedly arranged between the combustion chamber and the ash pool, a first double-layer plate water-cooled wall is arranged on the outer side of the combustion chamber and on a boiler arch, one end of the water fire grate is communicated with a water return port of the boiler, the other end of the water fire grate is communicated with the first double-layer plate water-cooled wall, a primary air supply pipe is arranged below the water fire grate, and a secondary air supply pipe is arranged on the side wall of the combustion chamber. The heating system comprises a boiler, a water tank, a water supply drum and a water return drum, the water tank is connected with a water inlet of the boiler through a water pipe, a smoke outlet of the boiler is connected with the water supply drum, the water supply drum is connected with a smoke inlet of the water return drum, and the water return drum is connected with a chimney; a water outlet of the boiler is connected with a water inlet of the water supply boiler barrel, a water outlet of the water supply boiler barrel supplies water to users, user return water is connected with the water return boiler barrel through a water return pipe, and the water return boiler barrel is connected with the boiler. The straw combustion efficiency is high, coal can be replaced, and the condition of the same room temperature is achieved.

Description

Technical Field

[0001] The utility model relates to the field of straw recycling, in particular to a straw burning boiler and a straw burning heating system. Background Art

[0002] my country is a big agricultural country, especially in the Northeast region, where corn, wheat, soybeans and rice are the main crop varieties. Corn and other crop straw are mainly used by farmers for burning for heating, raising animals and returning straw to fields. Returning straw to fields has not been widely promoted because of its difficulty in decomposition and susceptibility to diseases and pests. As a result, most of the straw is not utilized. Farmers basically burn the remaining straw before sowing, and the smoke from burning pollutes the environment.

[0003] At present, factories in towns and villages that cannot be centrally heated in winter basically use coal as the main fuel for heating. In recent years, global coal resources have continued to be tight, and coal prices have skyrocketed, causing factory operating costs to continue to increase. In addition, coal will release a large amount of sulfur-containing and nitrate-containing substances during combustion, and will produce smoke and dust. If these substances are not treated, they will cause certain pollution to the atmosphere, so desulfurization, denitrification and dust removal are required. In the environment of a large amount of surplus straw and tight coal resources, it is particularly important to develop a device that uses straw instead of coal for heating. However, some straw burning equipment now has poor heating effect due to structural reasons, and the room temperature has not been up to standard, and it cannot replace coal heating. Therefore, a device that uses straw burning for heating with good combustion effect, high efficiency and high heating temperature is needed. Summary of the invention

[0004] The utility model aims to provide a straw burning boiler and a heating system. The straw heating system has high straw burning efficiency and can replace coal to achieve indoor heating in winter.

[0005] The technical solution of this utility model:

[0006] A straw burning boiler comprises a combustion chamber arranged on the upper side and an ash pool arranged on the lower side, a filling door is arranged on one side of the combustion chamber, a water grate is fixedly installed between the combustion chamber and the ash pool, a first double-layer plate water-cooled wall is arranged on the outer side of the combustion chamber and on the furnace arch, a smoke exhaust port is opened on the furnace arch at the top of the combustion chamber, and a smoke outlet and a water outlet are opened on the first double-layer plate water-cooled wall,

[0007] One end of the water grate is connected to the boiler water return port, and the other end is connected to the first double-layer plate water-cooled wall.

[0008] A plurality of primary air supply pipes are arranged below the water grate, and an air outlet for discharging air into the combustion chamber is opened on the primary air supply pipe. The plurality of primary air supply pipes are collected into a primary air supply main pipe, and the primary air supply main pipe is connected to the fan.

[0009] A plurality of secondary air supply pipes are arranged on the side wall of the combustion chamber, and the plurality of secondary air supply pipes are gathered into a secondary air supply main pipe, and the secondary air supply main pipe is connected to the fan.

[0010] A straw burning heating system, a furnace, a water tank, a water supply drum, a return water drum,

[0011] The water tank is connected to the water inlet of the boiler through a water pipe, the smoke outlet of the boiler is connected to the smoke inlet of the water supply drum through a smoke pipe, the smoke outlet of the water supply drum is connected to the smoke inlet of the return water drum through a smoke pipe, and the smoke outlet of the return water drum is connected to the chimney through the smoke pipe;

[0012] The water outlet of the boiler is connected to the water inlet of the water supply drum through a water pipe, the water outlet of the water supply drum supplies water to the user through a water supply pipe, a circulating pump is installed on the water supply pipe, the user return water is connected to the return water outlet of the return water drum through a return water pipe, and the water outlet of the return water drum is connected to the return water outlet of the boiler through a water pipe;

[0013] Exhaust pipes are connected to the boiler, the smoke pipe connecting the boiler and the water supply drum, the smoke pipe between the water supply drum and the return water drum, the water pipes between the water supply drums, and the water pipes between the return water drums. All exhaust pipes are gathered into a main exhaust pipe, which extends into the water tank.

[0014] Beneficial effects of the utility model:

[0015] 1. The straw combustion efficiency of the heating system of this application is high and can replace coal. When the room temperature is the same, the ratio of coal to straw is close to 1:1-1.2.

[0016] 2. The heating system of this application can use the remaining straw of farmers instead of coal for heating, saving energy, reducing costs, and solving the problem of environmental pollution caused by straw burning.

[0017] 3. The heating system of this application is equipped with a water supply drum and a return water drum, which can better recover the heat in the flue gas duct.

[0018] 4. The ash pool of the boiler of the present application has a third double-layer water-cooled wall, which can better utilize the ash in the ash pool to heat the water and better utilize the heat. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] 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 embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0020] Figure 1 This is a schematic diagram of the overall structure of the straw heating system of this application.

[0021] Figure 2 Front view of the straw burning boiler for this application.

[0022] Figure 3 Side view of a straw burning boiler for this application.

[0023] Figure 4 A cross-sectional view of a straw burning boiler for this application.

[0024] Figure 5 This is a schematic diagram of the structure of the water supply drum or return drum of the straw heating system of this application.

[0025] Figure 6 This is a cross-sectional view of a water supply drum or a return water drum of a straw heating system for this application.

[0026] Figure 7 This is an enlarged view of the baffle portion of the straw burning boiler of this application.

[0027] Figure 8 This is an enlarged view of the baffle portion of the straw burning boiler of this application.

[0028] Fig. 9 This is a schematic diagram of water flow in the straw burning boiler for this application.

[0029] Fig.10 This is a schematic diagram of water flow in the straw burning boiler for this application.

[0030] Reference numerals:

[0031] Boiler 1; water tank 2; water supply drum 3; return drum 4; water pipe 5; smoke pipe 6; chimney 7; water supply pipe 8; circulating pump 9; return pipe 10; motor 11; exhaust pipe 12; main exhaust pipe 13; turbine 14; generator 15; cyclone dust collector 16; bag dust collector 17; induced draft fan 18.

[0032] Combustion chamber 21; ash pool 22; filling door 23; water grate 24; furnace arch 25; first double-layer plate water-cooled wall 26; smoke outlet 27; smoke outlet 28; water outlet 29; primary air supply duct 30; primary air supply main pipe 31; secondary air supply duct 32; secondary air supply main pipe 33; water furnace pipe 34; grate water inlet pipe 35; furnace outlet water pipe 36; water-cooled wall pipe 37; second exhaust pipe 38; supporting water pipe 39; second filling door 40; hay mower 41; tertiary air supply duct 42; second double-layer plate water-cooled wall 43; air outlet pipe 44; baffle 45; connecting pipe 46.

[0033] Smoke chamber 51; heat exchange chamber 52; third double-layer plate water-cooled wall 53; threaded pipe 54; smoke inlet and outlet 55; ash removal door 56; smoke cavity 57; water cavity 58; water inlet and outlet 59; shell 60; liner 61; smoke hole 62; small water hole 63. DETAILED DESCRIPTION

[0034] In order to solve the problems in the background technology, the straw burning boiler and heating system of the present application are specially invented. In the winter in the Northeast region, the remaining straw is mainly used instead of coal for heating, which saves resources, reduces costs, and solves the problem of surplus straw.

[0035] The application is described in detail below with reference to the accompanying drawings:

[0036] like Figure 2-4 As shown,

[0037] A straw burning boiler 1 comprises a combustion chamber 21 (furnace) arranged above and an ash pool 22 below, a filling door 23 is arranged on one side of the combustion chamber 21, a water grate 24 is fixedly installed between the combustion chamber 21 and the ash pool 22, a first double-layer plate water-cooled wall 26 is arranged on the outer side of the combustion chamber 21 and on the furnace arch 25, the lower end of the first double-layer plate water-cooled wall is fixed on the ash pool, a smoke outlet 27 is opened on the furnace arch at the top of the combustion chamber 21, and a smoke outlet 28 and a water outlet 29 (one or more) are opened on the first double-layer plate water-cooled wall 26. One end of the water grate 24 is connected to the boiler return water port, and the other end is connected to the first double-layer plate water-cooled wall 26. A plurality of primary air supply pipes 30 are arranged below the water grate 24, and an air outlet is opened on the primary air supply pipe 30, and the air outlet blows air into the combustion chamber, and the plurality of primary air supply pipes 30 are collected into a primary air supply main pipe 31, and the primary air supply main pipe 31 is connected to a fan. A plurality of secondary air supply pipes 32 are provided on the side wall of the combustion chamber 21, and the plurality of secondary air supply pipes 32 are gathered into a secondary air supply main pipe 33, and the secondary air supply main pipe 33 is connected to the fan. The primary air supply and the secondary air supply are blown into the combustion chamber respectively, and the wind blows the fire to burn turbulently in the furnace, and the straw combustion efficiency is high.

[0038] The straw bales pushed into the furnace again are subjected to strong heat radiation from the furnace, refractory brick walls and furnace arches, as well as the high temperature of the flame and smoke generated in the space, and the primary air supply under the water-passing grate and the secondary air supply on the side of the refractory brick wall of the combustion chamber. Therefore, the heat source for ignition is very sufficient. Combustion under high temperature and oxygen-deficient conditions can produce combustible gas and straw that burn simultaneously. Blue flames can be seen burning the gas during combustion. Only the combustion of combustible gas can quickly increase the water temperature in the boiler.

[0039] like Figure 2-4 As shown,

[0040] The number of the combustion chamber 21 and the ash pool 22 is one or more, and the multiple combustion chambers 21 and ash pools 22 are all arranged in the first double-layer plate water-cooled wall 26. There are multiple combustion chambers and ash pools, and only one combustion chamber and ash pool is used when the weather temperature is high, and multiple combustion chambers and ash pools are used at the same time when the weather temperature is low. When multiple combustion chambers and ash pools are used at the same time, the heat of the straw can be better utilized, and the heat generated by multiple combustion chambers and ash pools of the same area is greater than the heat generated by one combustion chamber and ash pool.

[0041] like Figure 2-4 As shown,

[0042] The water grate 24 includes a water furnace tube 34, a grate water inlet pipe 35 and a furnace discharge water pipe 36. Both ends of the water furnace tubes 34 are connected to the grate water inlet pipe 35 and the furnace discharge water pipe 36 respectively. The grate water inlet pipe is connected to the boiler return water port. Figure 4 Two combustion chambers and two ash pools are shown in the figure. A water grate is arranged between each combustion chamber and the ash pool. The grate water inlet pipe of each water grate (the other one on the left and right in the figure) is connected to the boiler return water port. The return water of the return water drum is guided to the water grate for circulation. The water outlet pipe of the boiler is connected to the first double-layer plate water-cooled wall outside the combustion chamber. The use of water grate can better protect the grate and also make better use of heat.

[0043] like Figure 2-4 As shown,

[0044] A plurality of water-cooled wall tubes 37 are arranged under the furnace arch 25, and the two ends of the water-cooled wall tubes 37 are fixed between the combustion chamber side wall and the furnace arch, and the two ends of the water-cooled wall tubes 37 are connected to the first double-layer plate water-cooled wall, and the water-cooled wall tubes are connected to the second exhaust pipe 38, and the second exhaust pipe 38 passes through the furnace arch and is connected to the first double-layer plate water-cooled wall above the furnace arch. It also includes a supporting water pipe 39, the upper end of which is connected to the first double-layer water-cooled wall above the furnace arch 25, and the lower end passes through the furnace arch and is inserted into the side wall between two adjacent combustion chambers. The water-cooled wall tubes, exhaust pipes and supporting water pipes of the present application are connected to the concrete furnace arch as a whole, which has a supporting effect on the furnace arch, better utilizes heat, and has a reinforcing effect on the furnace arch to prevent the furnace arch from collapsing.

[0045] like Figure 2-4 As shown,

[0046] The combustion chamber 21 and the furnace arch are composed of refractory brick walls, and a second filling door 40 is opened on the other side wall opposite to the filling door 23 of the combustion chamber. A straw injection device such as a grass cutter 41 is installed outside the second filling door 40 to spray straw into the second filling door. For boiler filling, the front door (filling door) directly fills the straw bales, and the small door (second filling door) at the back uses a grass cutter or other injection machine to spray the straw into the combustion chamber for combustion in the combustion chamber.

[0047] like Figure 2-4 As shown,

[0048] The side wall of the ash pool 22 is provided with a plurality of tertiary air supply pipes 42, which are collected into a tertiary air supply main pipe, which is connected to a fan. In the figure, the tertiary air supply main pipe and the primary air supply main pipe are connected to the same fan, or they may not be connected to the same fan. The ash pool has an ash removal door. In actual work, the fan can be arranged accordingly according to the location of the boiler, and the fan is arranged to supply air to the primary air supply main pipe, the secondary air supply main pipe and the tertiary air supply main pipe. A second double-layer plate water-cooled wall 43 is provided on the inner side of the side wall and the bottom wall of the ash pool, and the second double-layer plate water-cooled wall 43 is connected to the first double-layer plate water-cooled wall 26 through a connecting pipe 46.

[0049] There will be a lot of unburned straw and ash in the ash pool, which contain a lot of heat. The application adds a second double-layer plate water-cooled wall in the ash pool to better utilize the heat in the slag and ash. In actual work, when the boiler stops filling, the two filling doors and ash removal doors are closed, and the existing heat in the combustion chamber and ash pool can be used to heat a lot of water for heating, saving fuel.

[0050] like Figure 7-8 As shown,

[0051] The air outlet of the primary air supply pipe 30 is connected with an air outlet pipe 44, which extends to the gap between the water-passing furnace pipes. An inclined baffle plate 45 is welded on the water-passing furnace pipe, and the baffle plate is opposite to the air outlet pipe opening. The air outlet pipe blows air into the combustion chamber through the gap between the water-passing furnace pipes. In order to prevent the air outlet pipe opening from being blocked by furnace ash or unburned straw, a baffle plate is installed, which does not affect the air outlet pipe blowing into the combustion chamber and prevents the air outlet pipe from being blocked.

[0052] When in use, the straw bales are pushed into the combustion chamber through the feed door by a forklift for combustion. The unburned straw and ash fall into the ash pool from the gap between the water-passing grates. The ash pool is provided with a second double-layer plate water-cooled wall. Multiple three-time air blowing through the air duct makes the unburned broken straw and ash fall into the ash pool and continue to burn, heating the water in the second double-layer plate water-cooled wall. The unburned straw and ash of this application are kept at a temperature in the ash pool for more than 10 hours, and the boiler is continuously heated, saving 10% of the straw. The boilers in the prior art do not have an ash pool, but use a walking grate. The straw burns on the walking grate. The unburned straw and ash enter the water trough of the slag remover together and are discharged to the outside of the boiler. The heat of the unburned straw and ash cannot be utilized.

[0053] like Figure 1 As shown,

[0054] The straw burning heating system of the present application comprises the above-mentioned boiler 1, water tank 2, water supply drum 3, and return drum 4. The water tank 2 is connected to the water inlet of the boiler 1 (which can be arranged on the first double-layer plate water-cooled wall) through a water pipe, the smoke outlet of the boiler 1 is connected to the smoke inlet of the water supply drum 3 through a smoke pipe 6, the smoke outlet of the water supply drum 3 is connected to the smoke inlet of the return drum 4 through a smoke pipe 6, and the smoke outlet of the return drum 4 is connected to the chimney 7 through the smoke pipe 6. The water outlet of the boiler 1 is connected to the water inlet of the water supply drum 3 through a water pipe 5, and the water outlet of the water supply drum 3 supplies water to the user through a water supply pipe 8. A circulating pump 9 is installed on the water supply pipe, and the user's return water is connected to the return water outlet of the return water drum 4 through a return water pipe 10, and the water outlet of the return water drum 4 is connected to the return water outlet of the boiler 1 through a water pipe 5. The circulating pump 9 is driven to work by an electric motor 11. An exhaust pipe 12 is connected to the first double-layer plate water-cooled wall on the boiler, the smoke pipe connecting the boiler and the water supply drum, the smoke pipe between the water supply drum and the return water drum, the water pipe between the water supply drums, and the water pipe between the return water drums. All the exhaust pipes 12 are combined into a main exhaust pipe 13, and the main exhaust pipe 13 extends into the water tank 2.

[0055] like Figure 5-6 As shown,

[0056] There are one or more water supply drums 3 and return drums 4, and it is better to have more than one water supply drum and return drum, which is conducive to flue gas heat recovery. The smoke chambers of two adjacent water supply drums or return drums are connected by smoke pipes, and the heat exchange chambers of two adjacent water supply drums or return drums are connected by water pipes; the third double-layer plate water-cooled walls of two adjacent water supply drums or return drums are connected by water pipes.

[0057] The water supply drum 3 or the return water drum 4 (the water supply drum and the return water drum of the present application have the same structure) is divided into three parts: upper, middle and lower. The upper and lower parts are smoke chambers 51, and the middle is a heat exchange chamber 52. The smoke chambers 51 of the upper and lower parts are divided into a shell and an inner tank, and smoke flows in the inner tank. A third double-layer plate water-cooled wall 53 is located between the shell 60 and the inner tank 61. The upper and lower smoke chambers 51 and the heat exchange chamber 52 are separated by a partition 53, and a plurality of smoke holes 62 are opened in the middle of the partition. A plurality of threaded pipes 54 are arranged in the heat exchange chamber. The upper and lower ends of the threaded pipes 4 are connected to the smoke holes on the partition, and the threaded pipes are connected to the upper and lower smoke chambers through the smoke holes. A plurality of small water holes 63 are opened on the outer circle of the partition plate, and the third double-layer plate water-cooled wall 53 is connected to the heat exchange chamber 52 through the small water holes. The side wall of the smoke chamber 51 is opened with a smoke inlet and outlet 55 (smoke inlet or smoke outlet), and the side wall of the heat exchange chamber is opened with a water inlet and outlet 59 (water outlet or water outlet). The smoke inlet and outlet use a smoke pipe to connect the smoke chamber of the water supply drum or the return drum, and the water inlet and outlet use a water pipe to connect the heat exchange chamber of the water supply drum or the return drum. The water supply drum and the return drum are provided with an inspection cover on the top and an ash removal door 56 on the bottom.

[0058] The first double-layer plate water-cooled wall, the second double-layer plate water-cooled wall and the third double-layer plate water-cooled wall are all water storage spaces formed by two plates.

[0059] like Figure 1 As shown,

[0060] The smoke pipe between the boiler and the water supply drum, between the water supply drum and the return water drum, between multiple water supply drums, and between multiple return water drums is composed of a central smoke passage cavity 57 and a peripheral water cavity 58. The peripheral water cavity can better protect the smoke pipe and better utilize the heat of the smoke. The water cavity is connected to the adjacent first double-layer plate water-cooled wall or the third double-layer plate water-cooled wall.

[0061] This heating system is equipped with multiple water supply drums. The smoke discharged from the boiler enters the inner tank of the smoke chamber above the water supply copper drum through the smoke pipe, and then guides the smoke into the smoke chamber below through the threaded pipe. The smoke in the smoke chamber below is guided to the next water supply drum through the smoke pipe, and the cycle is repeated until it is discharged from the water supply drum. The water discharged from the boiler enters the combustion chamber. The outside of the threaded pipe in the combustion chamber is filled with water. After circulating through multiple water supply drums, the heat of the smoke is converted into the temperature of the water. The smoke temperature drops sharply and the water temperature rises sharply. In addition, there are multiple water supply drums. The hot water from the boiler is transmitted to multiple drums for reheating, and then transmitted to the user through the water supply pipe for heating. The heat is well utilized and the efficiency is high.

[0062] There are also multiple return drums, and the user return water enters the return drum through the pipeline. The smoke discharged from the water supply drum enters the return drum (the movement mode is the same as the water supply drum), and the water and smoke exchange heat in the return drum. The water discharged from the return drum enters the return port of the boiler through the water pipe, and then enters the water grate and the first double-layer plate water-cooled wall for the next cycle. The smoke discharged from the water supply drum enters the return drum, heats the user return water in the return drum, and the return water temperature rises after passing through multiple return drums, and the smoke temperature drops to the lowest when discharged.

[0063] like Figure 1 As shown,

[0064] In order to better utilize energy, a water turbine 14 may be installed on the user return water pipe, and the water turbine 14 drives a generator 15 to generate electricity through a belt or a transmission shaft. A cyclone dust collector 16, a bag dust collector 17, and an induced draft fan 18 are installed in sequence on the smoke pipe between the return water drum 4 and the chimney 7, and the motor drives the induced draft fan to work through a belt. The user return water has pressure, which is suitable for driving the water turbine, and the water turbine drives the generator to generate electricity.

[0065] As an extension of the use, the boiler is arranged in a greenhouse, and the boiler is half buried underground. Water flows in the water-cooled wall tubes to quickly heat the boiler water. The greenhouse boiler is installed semi-underground, with the greenhouse above, and the boiler dissipates heat. When in use, the boiler can be installed semi-underground, with the greenhouse above, and the temperature emitted by the boiler meets the needs of the greenhouse. Vegetables, flowers and other plants can be planted in the greenhouse for viewing. During the day, solar panels and other equipment are installed in the greenhouse to heat the boiler water, and at night the waste heat from the boiler dissipates heat and heats the greenhouse.

[0066] Usage process:

[0067] Step 1: Fill water into the first double-layer plate water-cooled wall from the water tank.

[0068] Step 2: The fan blows air into the primary air supply pipe through the primary air supply main pipe, and the air in the primary air supply pipe blows air from bottom to top into the combustion chamber of the boiler through the air outlet pipe. The fan blows air into the secondary air supply pipe through the secondary air supply main pipe, and the secondary air supply pipe blows air into the combustion chamber around the combustion chamber. The fan blows air into the tertiary air supply pipe through the tertiary air supply main pipe, and the tertiary air supply pipe blows air into the ash pool.

[0069] Step 3: Put the straw bales into the combustion chamber of the boiler from the filling door. The burning of straw heats the water in the water grate and the water in the first double-layer plate water-cooled wall. The unburned straw and ash falling into the ash pool heat the water in the second double-layer plate water-cooled wall, and then the water in the water grate, the first double-layer plate water-cooled wall, the second double-layer plate water-cooled wall, the water-cooled wall tubes on the furnace arch, and the supporting water pipes are all heated and circulated.

[0070] Step 4: The flue gas discharged from the boiler enters the smoke chamber above the first drum of the water supply drum through the smoke pipe, and then enters the smoke chamber below through the threaded pipe. The smoke chamber below enters the next drum through the smoke pipe, and the cycle continues until the last water supply drum. The water heated by the boiler flows into the heat exchange chamber of the first drum of the water supply drum through the water pipe, and then is introduced into the following drums in sequence through the water pipe. The last water supply drum supplies water to the user through the water supply pipe. The flue gas and water exchange heat in the water supply drum, the flue gas temperature drops, and the water temperature rises.

[0071] Step 5: The flue gas discharged from the water supply drum enters the smoke chamber above the first return water drum, and then enters the smoke chamber below through the threaded pipe. The smoke gas passes through the smoke pipe and enters the smoke chamber below the next drum. This cycle continues until the last return water drum, and then the smoke gas is discharged from the return water drum. The smoke gas passes through the cyclone dust collector, bag dust collector, and induced draft fan, and then is discharged through the chimney.

[0072] The user's return water enters the heat exchange chamber of the last drum of the return drum through the return pipe, and then enters the previous drum through the water pipe until it reaches the heat exchange chamber of the first return drum. The return water flows out of the return drum, enters the return port of the boiler through the water pipe, and then enters the water grate and the first double-layer plate water-cooled wall, completing the entire system cycle.

[0073] Example application comparison:

[0074] From 2020 to 2023, the applicant is responsible for the heating of Guohua Community and the government commercial and service building in Shuanghe Township, Lishu County, Jilin Province. The heating period is from October 10th of each year to April 10th of the following year. The following is a comparison of the use of coal and straw for heating in the two heating seasons.

[0075]

[0076] Note: The indoor temperatures in the above table are measured by the People's Government of Shuanghe Township, Lishu County.

[0077] The above schematically describes the present invention and its implementation methods, which are not restrictive. The drawings show only one implementation method of the present invention, and the actual structure is not limited thereto. Therefore, if a person skilled in the art is inspired by the above and does not deviate from the technical solution of the present invention, and designs a structure and implementation similar to the technical solution based on the above implementation examples without creativity, they shall all fall within the protection scope of the present invention.

Claims

1. A straw burning boiler, characterized in that: It comprises a combustion chamber arranged above and an ash pool below, a filling door is arranged on one side of the combustion chamber, a water-passing grate is fixedly installed between the combustion chamber and the ash pool, a first double-layer plate water-cooled wall is arranged on the outer side of the combustion chamber and on the furnace arch, a smoke exhaust port is arranged on the furnace arch on the top of the combustion chamber, and a smoke outlet and a water outlet are arranged on the first double-layer plate water-cooled wall; one end of the water-passing grate is connected with the boiler return water port, and the other end is connected with the first double-layer plate water-cooled wall; a plurality of primary air supply ducts are arranged below the water-passing grate, an air outlet for discharging air into the combustion chamber is arranged on the primary air supply duct, the plurality of primary air supply ducts are gathered into a primary air supply main pipe, and the primary air supply main pipe is connected to a fan; a plurality of secondary air supply ducts are arranged on the side wall of the combustion chamber, the plurality of secondary air supply ducts are gathered into a secondary air supply main pipe, and the secondary air supply main pipe is connected to a fan.

2. A straw burning boiler according to claim 1, characterized in that: The number of the combustion chamber and the ash pool is one or more, and the multiple combustion chambers and the ash pools are all arranged in the first double-layer plate water-cooled wall.

3. A straw burning boiler according to claim 2, characterized in that: The water-passing grate includes a water-passing furnace tube, a grate water inlet pipe and a furnace discharge water pipe. Both ends of the multiple water-passing furnace tubes are respectively connected to the grate water inlet pipe and the furnace discharge water pipe. The grate water inlet pipe is connected to the boiler return water port, and the furnace discharge water pipe is connected to the first double-layer plate water-cooled wall outside the combustion chamber.

4. A straw burning boiler according to claim 1 or 3, characterized in that: A plurality of water-cooled wall tubes are arranged under the furnace arch, and both ends of the water-cooled wall tubes are fixed between the side wall of the combustion chamber and the furnace arch. Both ends of the water-cooled wall tubes are connected to the first double-layer water-cooled wall. The water-cooled wall tubes are connected to the exhaust pipe, and the exhaust pipe passes through the furnace arch and is connected to the first double-layer water-cooled wall above the furnace arch; it also includes a supporting water pipe, the upper end of the supporting water pipe is connected to the first double-layer water-cooled wall above the furnace arch, and the lower end passes through the furnace arch and is inserted into the side wall between two adjacent combustion chambers.

5. The straw burning boiler according to claim 1, characterized in that: The combustion chamber and the furnace arch are composed of refractory brick walls. A second filling door is opened on the other side wall opposite to the filling door of the combustion chamber. A grass cutter for spraying straw into the second filling door is arranged outside the second filling door.

6. A straw burning boiler according to claim 4, characterized in that: The ash pool side wall is provided with a plurality of tertiary air supply ducts, which are gathered into a tertiary air supply main duct, which is connected to the fan; the inner side of the ash pool side wall and the bottom wall is provided with a second double-layer plate water-cooled wall, which is connected to the first double-layer plate water-cooled wall through a connecting pipe.

7. The straw burning boiler according to claim 3, characterized in that: The air outlet of the primary air supply pipe is connected with an air outlet pipe, which extends to the gap between the water-passing furnace pipes. An inclined baffle is welded on the water-passing furnace pipe, and the baffle is opposite to the air outlet pipe opening.

8. A straw burning heating system, characterized in that: The invention comprises a boiler, a water tank, a water supply drum and a return water drum as described in any one of claims 1 to 7, wherein the water tank is connected to the water inlet of the boiler through a water pipe, the smoke outlet of the boiler is connected to the smoke inlet of the water supply drum through a smoke pipe, the smoke outlet of the water supply drum is connected to the smoke inlet of the return water drum through a smoke pipe, and the smoke outlet of the return water drum is connected to the chimney through the smoke pipe; the water outlet of the boiler is connected to the water inlet of the water supply drum through a water pipe, the water outlet of the water supply drum supplies water to users through a water supply pipe, a circulating pump is installed on the water supply pipe, the user return water is connected to the return water outlet of the return water drum through a return water pipe, and the water outlet of the return water drum is connected to the return water outlet of the boiler through a water pipe; the boiler, the smoke pipe connecting the boiler and the water supply drum, the smoke pipe between the water supply drum and the return water drum, the water pipe between the water supply drum and the water pipe between the return water drum are connected to an exhaust pipe, and all the exhaust pipes are collected into a main exhaust pipe, and the main exhaust pipe extends into the water tank.

9. A straw burning heating system according to claim 8, characterized in that: The water supply drum or the return water drum is divided into three parts: upper, middle and lower. The upper and lower parts are smoke chambers, and the middle is a heat exchange chamber. The smoke chambers of the upper and lower parts are divided into a shell and an inner liner. The shell and the inner liner are separated by a third double-layer plate water-cooled wall. The upper and lower smoke chambers and the heat exchange chambers are separated by a partition. A plurality of smoke holes are opened on the partition. A plurality of threaded pipes are arranged in the heat exchange chamber. The upper and lower ends of the threaded pipes are connected to the smoke holes on the partition. The threaded pipes are connected to the upper and lower smoke chambers through the smoke holes. The third double-layer plate water-cooled wall is connected to the heat exchange chamber through small water holes on the outer ring of the partition. A smoke inlet and outlet are opened on the side wall of the smoke chamber, and a water inlet and outlet are opened on the side wall of the heat exchange chamber.

10. A straw burning heating system according to claim 9, characterized in that: There are one or more water supply drums and return water drums, the smoke chambers of two adjacent water supply drums or return water drums are connected by a smoke pipe, the heat exchange chambers of two adjacent water supply drums or return water drums are connected by a water pipe; the third double-layer plate water-cooled walls of two adjacent water supply drums or return water drums are connected by a water pipe.

11. A straw burning heating system according to claim 10, characterized in that: The smoke pipes between the boiler and the water supply drum, between the water supply drum and the return water drum, between multiple water supply drums, and between multiple return water drums are composed of a middle smoke passage cavity and a peripheral water cavity.

12. The straw burning heating system according to claim 8, characterized in that: The return water pipe is equipped with a turbine, which drives the generator to generate electricity through a belt or a transmission shaft; the smoke pipe between the return water drum and the chimney is equipped with a cyclone dust collector, a bag dust collector, and an induced draft fan in sequence, and the motor drives the induced draft fan to work through a belt.

13. The straw burning heating system according to claim 8, characterized in that: The boiler is arranged in a greenhouse and is half buried underground.

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